git.gag.com Git - fw/openocd/blob - src/target/cortex_m3.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   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 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         .blank_check_memory = armv7m_blank_check_memory,
  85
  86         .run_algorithm = armv7m_run_algorithm,
  87
  88         .add_breakpoint = cortex_m3_add_breakpoint,
  89         .remove_breakpoint = cortex_m3_remove_breakpoint,
  90         .add_watchpoint = cortex_m3_add_watchpoint,
  91         .remove_watchpoint = cortex_m3_remove_watchpoint,
  92
  93         .register_commands = cortex_m3_register_commands,
  94         .target_command = cortex_m3_target_command,
  95         .init_target = cortex_m3_init_target,
  96         .examine = cortex_m3_examine,
  97         .quit = cortex_m3_quit
  98 };
  99
 100 int cortex_m3_clear_halt(target_t *target)
 101 {
 102         /* get pointers to arch-specific information */
 103         armv7m_common_t *armv7m = target->arch_info;
 104         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 105         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 106
 107     /* Read Debug Fault Status Register */
 108     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 109     /* Write Debug Fault Status Register to enable processing to resume ?? Try with and without this !! */
 110     ahbap_write_system_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
 111     LOG_DEBUG(" NVIC_DFSR 0x%x", cortex_m3->nvic_dfsr);
 112
 113     return ERROR_OK;
 114 }
 115
 116 int cortex_m3_single_step_core(target_t *target)
 117 {
 118         /* get pointers to arch-specific information */
 119         armv7m_common_t *armv7m = target->arch_info;
 120         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 121         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 122
 123         if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
 124                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN );
 125         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN );
 126         cortex_m3->dcb_dhcsr |= C_MASKINTS;
 127         LOG_DEBUG(" ");
 128         cortex_m3_clear_halt(target);
 129
 130         return ERROR_OK;
 131 }
 132
 133 int cortex_m3_exec_opcode(target_t *target,u32 opcode, int len /* MODE, r0_invalue, &r0_outvalue */ )
 134 {
 135         /* get pointers to arch-specific information */
 136         armv7m_common_t *armv7m = target->arch_info;
 137         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 138         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 139         u32 savedram;
 140         int retvalue;
 141
 142         ahbap_read_system_u32(swjdp, 0x20000000, &savedram);
 143         ahbap_write_system_u32(swjdp, 0x20000000, opcode);
 144         ahbap_write_coreregister_u32(swjdp, 0x20000000, 15);
 145         cortex_m3_single_step_core(target);
 146         armv7m->core_cache->reg_list[15].dirty = armv7m->core_cache->reg_list[15].valid;
 147         retvalue = ahbap_write_system_atomic_u32(swjdp, 0x20000000, savedram);
 148
 149         return retvalue;
 150 }
 151
 152 #if 0
 153 /* Enable interrupts */
 154 int cortex_m3_cpsie(target_t *target, u32 IF)
 155 {
 156         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSIE(IF), 2);
 157 }
 158
 159 /* Disable interrupts */
 160 int cortex_m3_cpsid(target_t *target, u32 IF)
 161 {
 162         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSID(IF), 2);
 163 }
 164 #endif
 165
 166 int cortex_m3_endreset_event(target_t *target)
 167 {
 168         int i;
 169         u32 dcb_demcr;
 170
 171         /* get pointers to arch-specific information */
 172         armv7m_common_t *armv7m = target->arch_info;
 173         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 174         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 175         cortex_m3_fp_comparator_t *fp_list = cortex_m3->fp_comparator_list;
 176         cortex_m3_dwt_comparator_t *dwt_list = cortex_m3->dwt_comparator_list;
 177
 178         ahbap_read_system_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
 179         LOG_DEBUG("DCB_DEMCR = 0x%8.8x",dcb_demcr);
 180
 181         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 182
 183         /* Enable debug requests */
 184         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 185         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 186                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 187         /* Enable trace and dwt */
 188         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR );
 189         /* Monitor bus faults */
 190         ahbap_write_system_u32(swjdp, NVIC_SHCSR, SHCSR_BUSFAULTENA );
 191
 192         /* Enable FPB */
 193         target_write_u32(target, FP_CTRL, 3);
 194
 195         /* Restore FPB registers */
 196         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 197         {
 198                 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 199         }
 200
 201         /* Restore DWT registers */
 202         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
 203         {
 204                 target_write_u32(target, dwt_list[i].dwt_comparator_address, dwt_list[i].comp);
 205                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x4, dwt_list[i].mask);
 206                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x8, dwt_list[i].function);
 207         }
 208         swjdp_transaction_endcheck(swjdp);
 209
 210         armv7m_invalidate_core_regs(target);
 211         return ERROR_OK;
 212 }
 213
 214 int cortex_m3_examine_debug_reason(target_t *target)
 215 {
 216         /* get pointers to arch-specific information */
 217         armv7m_common_t *armv7m = target->arch_info;
 218         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 219
 220         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
 221         /* only check the debug reason if we don't know it already */
 222
 223         if ((target->debug_reason != DBG_REASON_DBGRQ)
 224                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
 225         {
 226                 /*  INCOMPLETE */
 227
 228                 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
 229                 {
 230                         target->debug_reason = DBG_REASON_BREAKPOINT;
 231                         if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 232                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 233                 }
 234                 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 235                         target->debug_reason = DBG_REASON_WATCHPOINT;
 236         }
 237
 238         return ERROR_OK;
 239 }
 240
 241 int cortex_m3_examine_exception_reason(target_t *target)
 242 {
 243         u32 shcsr, except_sr, cfsr = -1, except_ar = -1;
 244
 245         /* get pointers to arch-specific information */
 246         armv7m_common_t *armv7m = target->arch_info;
 247         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 248         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 249
 250         ahbap_read_system_u32(swjdp, NVIC_SHCSR, &shcsr);
 251         switch (armv7m->exception_number)
 252         {
 253                 case 2: /* NMI */
 254                         break;
 255                 case 3: /* Hard Fault */
 256                         ahbap_read_system_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
 257                         if (except_sr & 0x40000000)
 258                         {
 259                                 ahbap_read_system_u32(swjdp, NVIC_CFSR, &cfsr);
 260                         }
 261                         break;
 262                 case 4: /* Memory Management */
 263                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 264                         ahbap_read_system_u32(swjdp, NVIC_MMFAR, &except_ar);
 265                         break;
 266                 case 5: /* Bus Fault */
 267                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 268                         ahbap_read_system_u32(swjdp, NVIC_BFAR, &except_ar);
 269                         break;
 270                 case 6: /* Usage Fault */
 271                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 272                         break;
 273                 case 11:        /* SVCall */
 274                         break;
 275                 case 12:        /* Debug Monitor */
 276                         ahbap_read_system_u32(swjdp, NVIC_DFSR, &except_sr);
 277                         break;
 278                 case 14:        /* PendSV */
 279                         break;
 280                 case 15:        /* SysTick */
 281                         break;
 282                 default:
 283                         except_sr = 0;
 284                         break;
 285         }
 286         swjdp_transaction_endcheck(swjdp);
 287     LOG_DEBUG("%s SHCSR 0x%x, SR 0x%x, CFSR 0x%x, AR 0x%x", armv7m_exception_string(armv7m->exception_number), \
 288         shcsr, except_sr, cfsr, except_ar);
 289         return ERROR_OK;
 290 }
 291
 292 int cortex_m3_debug_entry(target_t *target)
 293 {
 294         int i;
 295         u32 xPSR;
 296         int retval;
 297
 298         /* get pointers to arch-specific information */
 299         armv7m_common_t *armv7m = target->arch_info;
 300         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 301         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 302
 303         LOG_DEBUG(" ");
 304         if (armv7m->pre_debug_entry)
 305                 armv7m->pre_debug_entry(target);
 306
 307         cortex_m3_clear_halt(target);
 308         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 309
 310         if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
 311                 return retval;
 312
 313         /* Examine target state and mode */
 314         /* First load register acessible through core debug port*/
 315         for (i = 0; i < ARMV7M_PRIMASK; i++)
 316         {
 317                 if (!armv7m->core_cache->reg_list[i].valid)
 318                         armv7m->read_core_reg(target, i);
 319         }
 320
 321         xPSR = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32);
 322
 323 #ifdef ARMV7_GDB_HACKS
 324         /* copy real xpsr reg for gdb, setting thumb bit */
 325         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
 326         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
 327         armv7m_gdb_dummy_cpsr_reg.valid = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 328         armv7m_gdb_dummy_cpsr_reg.dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty;
 329 #endif
 330
 331         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 332         if (xPSR & 0xf00)
 333         {
 334                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 335                 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
 336         }
 337
 338         /* Now we can load SP core registers */
 339         for (i = ARMV7M_PRIMASK; i < ARMV7NUMCOREREGS; i++)
 340         {
 341                 if (!armv7m->core_cache->reg_list[i].valid)
 342                         armv7m->read_core_reg(target, i);
 343         }
 344
 345         /* Are we in an exception handler */
 346         if (xPSR & 0x1FF)
 347         {
 348                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 349                 armv7m->exception_number = (xPSR & 0x1FF);
 350         }
 351         else
 352         {
 353                 armv7m->core_mode = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1);
 354                 armv7m->exception_number = 0;
 355         }
 356
 357         if (armv7m->exception_number)
 358         {
 359                 cortex_m3_examine_exception_reason(target);
 360         }
 361
 362         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%x, target->state: %s", armv7m_mode_strings[armv7m->core_mode], \
 363                 *(u32*)(armv7m->core_cache->reg_list[15].value), target_state_strings[target->state]);
 364
 365         if (armv7m->post_debug_entry)
 366                 armv7m->post_debug_entry(target);
 367
 368         return ERROR_OK;
 369 }
 370
 371 int cortex_m3_poll(target_t *target)
 372 {
 373         int retval;
 374         u32 prev_target_state = target->state;
 375
 376         /* get pointers to arch-specific information */
 377         armv7m_common_t *armv7m = target->arch_info;
 378         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 379         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 380
 381         /* Read from Debug Halting Control and Status Register */
 382         retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 383         if (retval != ERROR_OK)
 384         {
 385                 target->state = TARGET_UNKNOWN;
 386                 return retval;
 387         }
 388
 389         if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 390         {
 391                 /* check if still in reset */
 392                 ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 393
 394                 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 395                 {
 396                         target->state = TARGET_RESET;
 397                         return ERROR_OK;
 398                 }
 399         }
 400
 401         if (target->state == TARGET_RESET)
 402         {
 403                 /* Cannot switch context while running so endreset is called with target->state == TARGET_RESET */
 404                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%x", cortex_m3->dcb_dhcsr);
 405                 cortex_m3_endreset_event(target);
 406                 target->state = TARGET_RUNNING;
 407                 prev_target_state = TARGET_RUNNING;
 408         }
 409
 410         if (cortex_m3->dcb_dhcsr & S_HALT)
 411         {
 412                 target->state = TARGET_HALTED;
 413
 414                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
 415                 {
 416                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 417                                 return retval;
 418
 419                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 420                 }
 421                 if (prev_target_state == TARGET_DEBUG_RUNNING)
 422                 {
 423                         LOG_DEBUG(" ");
 424                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 425                                 return retval;
 426
 427                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 428                 }
 429         }
 430
 431         /*
 432         if (cortex_m3->dcb_dhcsr & S_SLEEP)
 433                 target->state = TARGET_SLEEP;
 434         */
 435
 436 #if 0
 437     /* Read Debug Fault Status Register, added to figure out the lockup when running flashtest.script  */
 438         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 439         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]);
 440 #endif
 441
 442         return ERROR_OK;
 443 }
 444
 445 int cortex_m3_halt(target_t *target)
 446 {
 447         /* get pointers to arch-specific information */
 448         armv7m_common_t *armv7m = target->arch_info;
 449         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 450         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 451
 452         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 453
 454         if (target->state == TARGET_HALTED)
 455         {
 456                 LOG_DEBUG("target was already halted");
 457                 return ERROR_OK;
 458         }
 459
 460         if (target->state == TARGET_UNKNOWN)
 461         {
 462                 LOG_WARNING("target was in unknown state when halt was requested");
 463         }
 464
 465         if (target->state == TARGET_RESET)
 466         {
 467                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
 468                 {
 469                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 470                         return ERROR_TARGET_FAILURE;
 471                 }
 472                 else
 473                 {
 474                         /* we came here in a reset_halt or reset_init sequence
 475                          * debug entry was already prepared in cortex_m3_prepare_reset_halt()
 476                          */
 477                         target->debug_reason = DBG_REASON_DBGRQ;
 478
 479                         return ERROR_OK;
 480                 }
 481         }
 482
 483         /* Write to Debug Halting Control and Status Register */
 484         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 485
 486         target->debug_reason = DBG_REASON_DBGRQ;
 487
 488         return ERROR_OK;
 489 }
 490
 491 int cortex_m3_soft_reset_halt(struct target_s *target)
 492 {
 493         /* get pointers to arch-specific information */
 494         armv7m_common_t *armv7m = target->arch_info;
 495         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 496         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 497         u32 dcb_dhcsr = 0;
 498         int retval, timeout = 0;
 499
 500         /* Enter debug state on reset, cf. end_reset_event() */
 501         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 502
 503         /* Request a reset */
 504         ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET );
 505         target->state = TARGET_RESET;
 506
 507         /* registers are now invalid */
 508         armv7m_invalidate_core_regs(target);
 509
 510         while (timeout < 100)
 511         {
 512                 retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
 513                 if (retval == ERROR_OK)
 514                 {
 515                     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 516                         if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
 517                         {
 518                                 LOG_DEBUG("system reset-halted, dcb_dhcsr 0x%x, nvic_dfsr 0x%x", dcb_dhcsr, cortex_m3->nvic_dfsr);
 519                                 cortex_m3_poll(target);
 520                                 return ERROR_OK;
 521                         }
 522                         else
 523                                 LOG_DEBUG("waiting for system reset-halt, dcb_dhcsr 0x%x, %i ms", dcb_dhcsr, timeout);
 524                 }
 525                 timeout++;
 526                 usleep(1000);
 527         }
 528
 529         return ERROR_OK;
 530 }
 531
 532 int cortex_m3_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
 533 {
 534         /* get pointers to arch-specific information */
 535         armv7m_common_t *armv7m = target->arch_info;
 536         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 537         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 538         breakpoint_t *breakpoint = NULL;
 539         u32 dcb_dhcsr, resume_pc;
 540
 541         if (target->state != TARGET_HALTED)
 542         {
 543                 LOG_WARNING("target not halted");
 544                 return ERROR_TARGET_NOT_HALTED;
 545         }
 546
 547         if (!debug_execution)
 548         {
 549                 target_free_all_working_areas(target);
 550                 cortex_m3_enable_breakpoints(target);
 551                 cortex_m3_enable_watchpoints(target);
 552
 553                 /* TODOLATER Interrupt handling/disable for debug execution, cache ... ... */
 554         }
 555
 556         dcb_dhcsr = DBGKEY | C_DEBUGEN;
 557         if (debug_execution)
 558         {
 559                 /* Disable interrupts */
 560                 /*
 561                    We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
 562                    This is probably the same inssue as Cortex-M3 Errata 377493:
 563                    C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken.
 564                 */
 565                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 566                 /* Make sure we are in Thumb mode */
 567                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 568                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1<<24));
 569         }
 570
 571         /* current = 1: continue on current pc, otherwise continue at <address> */
 572         if (!current)
 573         {
 574                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 575                 armv7m->core_cache->reg_list[15].dirty = 1;
 576                 armv7m->core_cache->reg_list[15].valid = 1;
 577         }
 578
 579         resume_pc = buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32);
 580
 581         armv7m_restore_context(target);
 582
 583         /* the front-end may request us not to handle breakpoints */
 584         if (handle_breakpoints)
 585         {
 586                 /* Single step past breakpoint at current address */
 587                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 588                 {
 589                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 590                         cortex_m3_unset_breakpoint(target, breakpoint);
 591                         cortex_m3_single_step_core(target);
 592                         cortex_m3_set_breakpoint(target, breakpoint);
 593                 }
 594         }
 595
 596         /* Set/Clear C_MASKINTS in a separate operation */
 597         if ((cortex_m3->dcb_dhcsr & C_MASKINTS) != (dcb_dhcsr & C_MASKINTS))
 598                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr | C_HALT );
 599
 600         /* Restart core */
 601         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr );
 602         target->debug_reason = DBG_REASON_NOTHALTED;
 603
 604         /* registers are now invalid */
 605         armv7m_invalidate_core_regs(target);
 606         if (!debug_execution)
 607         {
 608                 target->state = TARGET_RUNNING;
 609                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 610                 LOG_DEBUG("target resumed at 0x%x",resume_pc);
 611         }
 612         else
 613         {
 614                 target->state = TARGET_DEBUG_RUNNING;
 615                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 616                 LOG_DEBUG("target debug resumed at 0x%x",resume_pc);
 617         }
 618
 619         return ERROR_OK;
 620 }
 621
 622 /* int irqstepcount=0; */
 623 int cortex_m3_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
 624 {
 625         /* get pointers to arch-specific information */
 626         armv7m_common_t *armv7m = target->arch_info;
 627         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 628         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 629         breakpoint_t *breakpoint = NULL;
 630
 631         if (target->state != TARGET_HALTED)
 632         {
 633                 LOG_WARNING("target not halted");
 634                 return ERROR_TARGET_NOT_HALTED;
 635         }
 636
 637         /* current = 1: continue on current pc, otherwise continue at <address> */
 638         if (!current)
 639                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 640
 641         /* the front-end may request us not to handle breakpoints */
 642         if (handle_breakpoints)
 643                 if ((breakpoint = breakpoint_find(target, buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32))))
 644                         cortex_m3_unset_breakpoint(target, breakpoint);
 645
 646         target->debug_reason = DBG_REASON_SINGLESTEP;
 647
 648         armv7m_restore_context(target);
 649
 650         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 651
 652         if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 653                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN );
 654         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY| C_STEP | C_DEBUGEN);
 655         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 656
 657         /* registers are now invalid */
 658         armv7m_invalidate_core_regs(target);
 659
 660         if (breakpoint)
 661                 cortex_m3_set_breakpoint(target, breakpoint);
 662
 663         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 664
 665         cortex_m3_debug_entry(target);
 666         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 667
 668         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 669         return ERROR_OK;
 670 }
 671
 672 int cortex_m3_assert_reset(target_t *target)
 673 {
 674         armv7m_common_t *armv7m = target->arch_info;
 675         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 676         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 677         int assert_srst = 1;
 678
 679         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 680
 681         if (!(jtag_reset_config & RESET_HAS_SRST))
 682         {
 683                 LOG_ERROR("Can't assert SRST");
 684                 return ERROR_FAIL;
 685         }
 686
 687         /* Enable debug requests */
 688         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 689         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 690                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 691
 692         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 693
 694         if (!target->reset_halt)
 695         {
 696                 /* Set/Clear C_MASKINTS in a separate operation */
 697                 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 698                         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 699
 700                 cortex_m3_clear_halt(target);
 701
 702                 /* Enter debug state on reset, cf. end_reset_event() */
 703                 ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 704         }
 705         else
 706         {
 707                 /* Enter debug state on reset, cf. end_reset_event() */
 708                 ahbap_write_system_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 709         }
 710
 711         /* following hack is to handle luminary reset
 712          * when srst is asserted the luminary device seesm to also clear the debug registers
 713          * which does not match the armv7 debug TRM */
 714
 715         if (strcmp(cortex_m3->variant, "lm3s") == 0)
 716         {
 717                 /* get revision of lm3s target, only early silicon has this issue
 718                  * Fury Rev B, DustDevil Rev B, Tempest all ok */
 719
 720                 u32 did0;
 721
 722                 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
 723                 {
 724                         switch ((did0 >> 16) & 0xff)
 725                         {
 726                                 case 0:
 727                                         /* all Sandstorm suffer issue */
 728                                         assert_srst = 0;
 729                                         break;
 730
 731                                 case 1:
 732                                 case 3:
 733                                         /* only Fury/DustDevil rev A suffer reset problems */
 734                                         if (((did0 >> 8) & 0xff) == 0)
 735                                                 assert_srst = 0;
 736                                         break;
 737                         }
 738                 }
 739         }
 740
 741         if (assert_srst)
 742         {
 743                 /* default to asserting srst */
 744                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 745                 {
 746                         jtag_add_reset(1, 1);
 747                 }
 748                 else
 749                 {
 750                         jtag_add_reset(0, 1);
 751                 }
 752         }
 753         else
 754         {
 755                 /* this causes the luminary device to reset using the watchdog */
 756                 ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ );
 757                 LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
 758         }
 759
 760         target->state = TARGET_RESET;
 761         jtag_add_sleep(50000);
 762
 763         armv7m_invalidate_core_regs(target);
 764
 765         return ERROR_OK;
 766 }
 767
 768 int cortex_m3_deassert_reset(target_t *target)
 769 {
 770         LOG_DEBUG("target->state: %s", target_state_strings[target->state]);
 771
 772         /* deassert reset lines */
 773         jtag_add_reset(0, 0);
 774
 775         return ERROR_OK;
 776 }
 777
 778 void cortex_m3_enable_breakpoints(struct target_s *target)
 779 {
 780         breakpoint_t *breakpoint = target->breakpoints;
 781
 782         /* set any pending breakpoints */
 783         while (breakpoint)
 784         {
 785                 if (breakpoint->set == 0)
 786                         cortex_m3_set_breakpoint(target, breakpoint);
 787                 breakpoint = breakpoint->next;
 788         }
 789 }
 790
 791 int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 792 {
 793         int fp_num=0;
 794         u32 hilo;
 795
 796         /* get pointers to arch-specific information */
 797         armv7m_common_t *armv7m = target->arch_info;
 798         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 799
 800         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 801
 802         if (breakpoint->set)
 803         {
 804                 LOG_WARNING("breakpoint already set");
 805                 return ERROR_OK;
 806         }
 807
 808         if (cortex_m3->auto_bp_type)
 809         {
 810                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 811         }
 812
 813         if (breakpoint->type == BKPT_HARD)
 814         {
 815                 while(comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
 816                         fp_num++;
 817                 if (fp_num >= cortex_m3->fp_num_code)
 818                 {
 819                         LOG_DEBUG("ERROR Can not find free FP Comparator");
 820                         LOG_WARNING("ERROR Can not find free FP Comparator");
 821                         exit(-1);
 822                 }
 823                 breakpoint->set = fp_num + 1;
 824                 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
 825                 comparator_list[fp_num].used = 1;
 826                 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 827                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 828                 LOG_DEBUG("fpc_num %i fpcr_value 0x%x", fp_num, comparator_list[fp_num].fpcr_value);
 829         }
 830         else if (breakpoint->type == BKPT_SOFT)
 831         {
 832                 u8 code[4];
 833                 buf_set_u32(code, 0, 32, ARMV7M_T_BKPT(0x11));
 834                 target->type->read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr);
 835                 target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code);
 836                 breakpoint->set = 0x11; /* Any nice value but 0 */
 837         }
 838
 839         return ERROR_OK;
 840 }
 841
 842 int cortex_m3_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 843 {
 844         /* get pointers to arch-specific information */
 845         armv7m_common_t *armv7m = target->arch_info;
 846         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 847         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 848
 849         if (!breakpoint->set)
 850         {
 851                 LOG_WARNING("breakpoint not set");
 852                 return ERROR_OK;
 853         }
 854
 855         if (breakpoint->type == BKPT_HARD)
 856         {
 857                 int fp_num = breakpoint->set - 1;
 858                 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
 859                 {
 860                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
 861                         return ERROR_OK;
 862                 }
 863                 comparator_list[fp_num].used = 0;
 864                 comparator_list[fp_num].fpcr_value = 0;
 865                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 866         }
 867         else
 868         {
 869                 /* restore original instruction (kept in target endianness) */
 870                 if (breakpoint->length == 4)
 871                 {
 872                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr);
 873                 }
 874                 else
 875                 {
 876                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr);
 877                 }
 878         }
 879         breakpoint->set = 0;
 880
 881         return ERROR_OK;
 882 }
 883
 884 int cortex_m3_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 885 {
 886         /* get pointers to arch-specific information */
 887         armv7m_common_t *armv7m = target->arch_info;
 888         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 889
 890         if (cortex_m3->auto_bp_type)
 891         {
 892                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 893 #ifdef ARMV7_GDB_HACKS
 894                 if (breakpoint->length != 2) {
 895                         /* XXX Hack: Replace all breakpoints with length != 2 with
 896                          * a hardware breakpoint. */
 897                         breakpoint->type = BKPT_HARD;
 898                         breakpoint->length = 2;
 899                 }
 900 #endif
 901         }
 902
 903         if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
 904         {
 905                 LOG_INFO("flash patch comparator requested outside code memory region");
 906                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 907         }
 908
 909         if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
 910         {
 911                 LOG_INFO("soft breakpoint requested in code (flash) memory region");
 912                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 913         }
 914
 915         if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
 916         {
 917                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
 918                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 919         }
 920
 921         if ((breakpoint->length != 2))
 922         {
 923                 LOG_INFO("only breakpoints of two bytes length supported");
 924                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 925         }
 926
 927         if (breakpoint->type == BKPT_HARD)
 928                 cortex_m3->fp_code_available--;
 929         cortex_m3_set_breakpoint(target, breakpoint);
 930
 931         return ERROR_OK;
 932 }
 933
 934 int cortex_m3_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 935 {
 936         /* get pointers to arch-specific information */
 937         armv7m_common_t *armv7m = target->arch_info;
 938         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 939
 940         if (target->state != TARGET_HALTED)
 941         {
 942                 LOG_WARNING("target not halted");
 943                 return ERROR_TARGET_NOT_HALTED;
 944         }
 945
 946         if (cortex_m3->auto_bp_type)
 947         {
 948                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 949         }
 950
 951         if (breakpoint->set)
 952         {
 953                 cortex_m3_unset_breakpoint(target, breakpoint);
 954         }
 955
 956         if (breakpoint->type == BKPT_HARD)
 957                 cortex_m3->fp_code_available++;
 958
 959         return ERROR_OK;
 960 }
 961
 962 int cortex_m3_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
 963 {
 964         int dwt_num=0;
 965         u32 mask, temp;
 966
 967         /* get pointers to arch-specific information */
 968         armv7m_common_t *armv7m = target->arch_info;
 969         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 970         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
 971
 972         if (watchpoint->set)
 973         {
 974                 LOG_WARNING("watchpoint already set");
 975                 return ERROR_OK;
 976         }
 977
 978         if (watchpoint->mask == 0xffffffffu)
 979         {
 980                 while(comparator_list[dwt_num].used && (dwt_num < cortex_m3->dwt_num_comp))
 981                         dwt_num++;
 982                 if (dwt_num >= cortex_m3->dwt_num_comp)
 983                 {
 984                         LOG_DEBUG("ERROR Can not find free DWT Comparator");
 985                         LOG_WARNING("ERROR Can not find free DWT Comparator");
 986                         return -1;
 987                 }
 988                 watchpoint->set = dwt_num + 1;
 989                 mask = 0;
 990                 temp = watchpoint->length;
 991                 while (temp > 1)
 992                 {
 993                         temp = temp / 2;
 994                         mask++;
 995                 }
 996                 comparator_list[dwt_num].used = 1;
 997                 comparator_list[dwt_num].comp = watchpoint->address;
 998                 comparator_list[dwt_num].mask = mask;
 999                 comparator_list[dwt_num].function = watchpoint->rw + 5;
1000                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address, comparator_list[dwt_num].comp);
1001                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x4, comparator_list[dwt_num].mask);
1002                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1003                 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);
1004         }
1005         else
1006         {
1007                 LOG_WARNING("Cannot watch data values");  /* Move this test to add_watchpoint */
1008                 return ERROR_OK;
1009         }
1010
1011         return ERROR_OK;
1012
1013 }
1014
1015 int cortex_m3_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1016 {
1017         /* get pointers to arch-specific information */
1018         armv7m_common_t *armv7m = target->arch_info;
1019         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1020         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1021         int dwt_num;
1022
1023         if (!watchpoint->set)
1024         {
1025                 LOG_WARNING("watchpoint not set");
1026                 return ERROR_OK;
1027         }
1028
1029         dwt_num = watchpoint->set - 1;
1030
1031         if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1032         {
1033                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1034                 return ERROR_OK;
1035         }
1036         comparator_list[dwt_num].used = 0;
1037         comparator_list[dwt_num].function = 0;
1038         target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1039
1040         watchpoint->set = 0;
1041
1042         return ERROR_OK;
1043 }
1044
1045 int cortex_m3_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1046 {
1047         /* get pointers to arch-specific information */
1048         armv7m_common_t *armv7m = target->arch_info;
1049         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1050
1051         if (target->state != TARGET_HALTED)
1052         {
1053                 LOG_WARNING("target not halted");
1054                 return ERROR_TARGET_NOT_HALTED;
1055         }
1056
1057         if (cortex_m3->dwt_comp_available < 1)
1058         {
1059                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1060         }
1061
1062         if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
1063         {
1064                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1065         }
1066
1067         cortex_m3->dwt_comp_available--;
1068
1069         return ERROR_OK;
1070 }
1071
1072 int cortex_m3_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1073 {
1074         /* get pointers to arch-specific information */
1075         armv7m_common_t *armv7m = target->arch_info;
1076         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1077
1078         if (target->state != TARGET_HALTED)
1079         {
1080                 LOG_WARNING("target not halted");
1081                 return ERROR_TARGET_NOT_HALTED;
1082         }
1083
1084         if (watchpoint->set)
1085         {
1086                 cortex_m3_unset_watchpoint(target, watchpoint);
1087         }
1088
1089         cortex_m3->dwt_comp_available++;
1090
1091         return ERROR_OK;
1092 }
1093
1094 void cortex_m3_enable_watchpoints(struct target_s *target)
1095 {
1096         watchpoint_t *watchpoint = target->watchpoints;
1097
1098         /* set any pending watchpoints */
1099         while (watchpoint)
1100         {
1101                 if (watchpoint->set == 0)
1102                         cortex_m3_set_watchpoint(target, watchpoint);
1103                 watchpoint = watchpoint->next;
1104         }
1105 }
1106
1107 int cortex_m3_load_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 * value)
1108 {
1109         int retval;
1110         /* get pointers to arch-specific information */
1111         armv7m_common_t *armv7m = target->arch_info;
1112         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1113         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1114
1115         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1116         {
1117                 /* read a normal core register */
1118                 retval = ahbap_read_coreregister_u32(swjdp, value, num);
1119
1120                 if (retval != ERROR_OK)
1121                 {
1122                         LOG_ERROR("JTAG failure %i",retval);
1123                         return ERROR_JTAG_DEVICE_ERROR;
1124                 }
1125                 LOG_DEBUG("load from core reg %i  value 0x%x",num,*value);
1126         }
1127         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1128         {
1129                 /* read other registers */
1130                 ahbap_read_coreregister_u32(swjdp, value, 20);
1131
1132                 switch (num)
1133                 {
1134                         case 19:
1135                                 *value = buf_get_u32((u8*)value, 0, 8);
1136                                 break;
1137
1138                         case 20:
1139                                 *value = buf_get_u32((u8*)value, 8, 8);
1140                                 break;
1141
1142                         case 21:
1143                                 *value = buf_get_u32((u8*)value, 16, 8);
1144                                 break;
1145
1146                         case 22:
1147                                 *value = buf_get_u32((u8*)value, 24, 8);
1148                                 break;
1149                 }
1150
1151                 LOG_DEBUG("load from special reg %i value 0x%x", num, *value);
1152         }
1153         else
1154         {
1155                 return ERROR_INVALID_ARGUMENTS;
1156         }
1157
1158         return ERROR_OK;
1159 }
1160
1161 int cortex_m3_store_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 value)
1162 {
1163         int retval;
1164         u32 reg;
1165
1166         /* get pointers to arch-specific information */
1167         armv7m_common_t *armv7m = target->arch_info;
1168         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1169         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1170
1171 #ifdef ARMV7_GDB_HACKS
1172         /* If the LR register is being modified, make sure it will put us
1173          * in "thumb" mode, or an INVSTATE exception will occur. This is a
1174          * hack to deal with the fact that gdb will sometimes "forge"
1175          * return addresses, and doesn't set the LSB correctly (i.e., when
1176          * printing expressions containing function calls, it sets LR=0.) */
1177
1178         if (num == 14)
1179                 value |= 0x01;
1180 #endif
1181
1182         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1183         {
1184                 retval = ahbap_write_coreregister_u32(swjdp, value, num);
1185                 if (retval != ERROR_OK)
1186                 {
1187                         LOG_ERROR("JTAG failure %i", retval);
1188                         armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
1189                         return ERROR_JTAG_DEVICE_ERROR;
1190                 }
1191                 LOG_DEBUG("write core reg %i value 0x%x", num, value);
1192         }
1193         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1194         {
1195                 /* write other registers */
1196
1197                 ahbap_read_coreregister_u32(swjdp, &reg, 20);
1198
1199                 switch (num)
1200                 {
1201                         case 19:
1202                                 buf_set_u32((u8*)&reg, 0, 8, value);
1203                                 break;
1204
1205                         case 20:
1206                                 buf_set_u32((u8*)&reg, 8, 8, value);
1207                                 break;
1208
1209                         case 21:
1210                                 buf_set_u32((u8*)&reg, 16, 8, value);
1211                                 break;
1212
1213                         case 22:
1214                                 buf_set_u32((u8*)&reg, 24, 8, value);
1215                                 break;
1216                 }
1217
1218                 ahbap_write_coreregister_u32(swjdp, reg, 20);
1219
1220                 LOG_DEBUG("write special reg %i value 0x%x ", num, value);
1221         }
1222         else
1223         {
1224                 return ERROR_INVALID_ARGUMENTS;
1225         }
1226
1227         return ERROR_OK;
1228 }
1229
1230 int cortex_m3_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1231 {
1232         /* get pointers to arch-specific information */
1233         armv7m_common_t *armv7m = target->arch_info;
1234         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1235         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1236         int retval;
1237
1238         /* sanitize arguments */
1239         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1240                 return ERROR_INVALID_ARGUMENTS;
1241
1242         /* cortex_m3 handles unaligned memory access */
1243
1244         switch (size)
1245         {
1246                 case 4:
1247                         retval = ahbap_read_buf_u32(swjdp, buffer, 4 * count, address);
1248                         break;
1249                 case 2:
1250                         retval = ahbap_read_buf_u16(swjdp, buffer, 2 * count, address);
1251                         break;
1252                 case 1:
1253                         retval = ahbap_read_buf_u8(swjdp, buffer, count, address);
1254                         break;
1255                 default:
1256                         LOG_ERROR("BUG: we shouldn't get here");
1257                         exit(-1);
1258         }
1259
1260         return retval;
1261 }
1262
1263 int cortex_m3_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1264 {
1265         /* get pointers to arch-specific information */
1266         armv7m_common_t *armv7m = target->arch_info;
1267         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1268         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1269         int retval;
1270
1271         /* sanitize arguments */
1272         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1273                 return ERROR_INVALID_ARGUMENTS;
1274
1275         switch (size)
1276         {
1277                 case 4:
1278                         retval = ahbap_write_buf_u32(swjdp, buffer, 4 * count, address);
1279                         break;
1280                 case 2:
1281                         retval = ahbap_write_buf_u16(swjdp, buffer, 2 * count, address);
1282                         break;
1283                 case 1:
1284                         retval = ahbap_write_buf_u8(swjdp, buffer, count, address);
1285                         break;
1286                 default:
1287                         LOG_ERROR("BUG: we shouldn't get here");
1288                         exit(-1);
1289         }
1290
1291         return retval;
1292 }
1293
1294 int cortex_m3_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
1295 {
1296         return cortex_m3_write_memory(target, address, 4, count, buffer);
1297 }
1298
1299 void cortex_m3_build_reg_cache(target_t *target)
1300 {
1301         armv7m_build_reg_cache(target);
1302 }
1303
1304 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
1305 {
1306         cortex_m3_build_reg_cache(target);
1307         return ERROR_OK;
1308 }
1309
1310 int cortex_m3_examine(struct target_s *target)
1311 {
1312         int retval;
1313         u32 cpuid, fpcr, dwtcr, ictr;
1314         int i;
1315
1316         /* get pointers to arch-specific information */
1317         armv7m_common_t *armv7m = target->arch_info;
1318         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1319         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1320
1321         target->type->examined = 1;
1322
1323         if ((retval=ahbap_debugport_init(swjdp))!=ERROR_OK)
1324                 return retval;
1325
1326         /* Read from Device Identification Registers */
1327         if ((retval=target_read_u32(target, CPUID, &cpuid))!=ERROR_OK)
1328                 return retval;
1329
1330         if (((cpuid >> 4) & 0xc3f) == 0xc23)
1331                 LOG_DEBUG("CORTEX-M3 processor detected");
1332         LOG_DEBUG("cpuid: 0x%8.8x", cpuid);
1333
1334         target_read_u32(target, NVIC_ICTR, &ictr);
1335         cortex_m3->intlinesnum = (ictr & 0x1F) + 1;
1336         cortex_m3->intsetenable = calloc(cortex_m3->intlinesnum, 4);
1337         for (i = 0; i < cortex_m3->intlinesnum; i++)
1338         {
1339                 target_read_u32(target, NVIC_ISE0 + 4 * i, cortex_m3->intsetenable + i);
1340                 LOG_DEBUG("interrupt enable[%i] = 0x%8.8x", i, cortex_m3->intsetenable[i]);
1341         }
1342
1343         /* Setup FPB */
1344         target_read_u32(target, FP_CTRL, &fpcr);
1345         cortex_m3->auto_bp_type = 1;
1346         cortex_m3->fp_num_code = (fpcr >> 4) & 0xF;
1347         cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1348         cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1349         cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
1350         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1351         {
1352                 cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1353                 cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1354         }
1355         LOG_DEBUG("FPB fpcr 0x%x, numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1356
1357         /* Setup DWT */
1358         target_read_u32(target, DWT_CTRL, &dwtcr);
1359         cortex_m3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1360         cortex_m3->dwt_comp_available = cortex_m3->dwt_num_comp;
1361         cortex_m3->dwt_comparator_list=calloc(cortex_m3->dwt_num_comp, sizeof(cortex_m3_dwt_comparator_t));
1362         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
1363         {
1364                 cortex_m3->dwt_comparator_list[i].dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1365         }
1366
1367         return ERROR_OK;
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
1522         return ERROR_OK;
1523 }
1524
1525 int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
1526 {
1527         int retval;
1528
1529         retval = armv7m_register_commands(cmd_ctx);
1530
1531         return retval;
1532 }