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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  *                                                                         *
  26  *                                                                         *
  27  *   Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0)              *
  28  *                                                                         *
  29  ***************************************************************************/
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include "cortex_m3.h"
  35 #include "target_request.h"
  36 #include "target_type.h"
  37 #include "arm_disassembler.h"
  38
  39
  40 #define ARRAY_SIZE(x)   ((int)(sizeof(x)/sizeof((x)[0])))
  41
  42
  43 /* cli handling */
  44 int cortex_m3_register_commands(struct command_context_s *cmd_ctx);
  45 int handle_cortex_m3_mask_interrupts_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  46
  47 /* forward declarations */
  48 void cortex_m3_enable_breakpoints(struct target_s *target);
  49 void cortex_m3_enable_watchpoints(struct target_s *target);
  50 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp);
  51 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  52 int cortex_m3_quit(void);
  53 int cortex_m3_load_core_reg_u32(target_t *target, enum armv7m_regtype type, uint32_t num, uint32_t *value);
  54 int cortex_m3_store_core_reg_u32(target_t *target, enum armv7m_regtype type, uint32_t num, uint32_t value);
  55 int cortex_m3_target_request_data(target_t *target, uint32_t size, uint8_t *buffer);
  56 int cortex_m3_examine(struct target_s *target);
  57
  58 #ifdef ARMV7_GDB_HACKS
  59 extern uint8_t armv7m_gdb_dummy_cpsr_value[];
  60 extern reg_t armv7m_gdb_dummy_cpsr_reg;
  61 #endif
  62
  63 target_type_t cortexm3_target =
  64 {
  65         .name = "cortex_m3",
  66
  67         .poll = cortex_m3_poll,
  68         .arch_state = armv7m_arch_state,
  69
  70         .target_request_data = cortex_m3_target_request_data,
  71
  72         .halt = cortex_m3_halt,
  73         .resume = cortex_m3_resume,
  74         .step = cortex_m3_step,
  75
  76         .assert_reset = cortex_m3_assert_reset,
  77         .deassert_reset = cortex_m3_deassert_reset,
  78         .soft_reset_halt = cortex_m3_soft_reset_halt,
  79
  80         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
  81
  82         .read_memory = cortex_m3_read_memory,
  83         .write_memory = cortex_m3_write_memory,
  84         .bulk_write_memory = cortex_m3_bulk_write_memory,
  85         .checksum_memory = armv7m_checksum_memory,
  86         .blank_check_memory = armv7m_blank_check_memory,
  87
  88         .run_algorithm = armv7m_run_algorithm,
  89
  90         .add_breakpoint = cortex_m3_add_breakpoint,
  91         .remove_breakpoint = cortex_m3_remove_breakpoint,
  92         .add_watchpoint = cortex_m3_add_watchpoint,
  93         .remove_watchpoint = cortex_m3_remove_watchpoint,
  94
  95         .register_commands = cortex_m3_register_commands,
  96         .target_create = cortex_m3_target_create,
  97         .init_target = cortex_m3_init_target,
  98         .examine = cortex_m3_examine,
  99         .quit = cortex_m3_quit
 100 };
 101
 102 int cortexm3_dap_read_coreregister_u32(swjdp_common_t *swjdp, uint32_t *value, int regnum)
 103 {
 104         int retval;
 105         uint32_t dcrdr;
 106
 107         /* because the DCB_DCRDR is used for the emulated dcc channel
 108          * we gave to save/restore the DCB_DCRDR when used */
 109
 110         mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr);
 111
 112         swjdp->trans_mode = TRANS_MODE_COMPOSITE;
 113
 114         /* mem_ap_write_u32(swjdp, DCB_DCRSR, regnum); */
 115         dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0);
 116         dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum);
 117
 118         /* mem_ap_read_u32(swjdp, DCB_DCRDR, value); */
 119         dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0);
 120         dap_ap_read_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value);
 121
 122         mem_ap_write_u32(swjdp, DCB_DCRDR, dcrdr);
 123         retval = swjdp_transaction_endcheck(swjdp);
 124         return retval;
 125 }
 126
 127 int cortexm3_dap_write_coreregister_u32(swjdp_common_t *swjdp, uint32_t value, int regnum)
 128 {
 129         int retval;
 130         uint32_t dcrdr;
 131
 132         /* because the DCB_DCRDR is used for the emulated dcc channel
 133          * we gave to save/restore the DCB_DCRDR when used */
 134
 135         mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr);
 136
 137         swjdp->trans_mode = TRANS_MODE_COMPOSITE;
 138
 139         /* mem_ap_write_u32(swjdp, DCB_DCRDR, core_regs[i]); */
 140         dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0);
 141         dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value);
 142
 143         /* mem_ap_write_u32(swjdp, DCB_DCRSR, i | DCRSR_WnR); */
 144         dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0);
 145         dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum | DCRSR_WnR);
 146
 147         mem_ap_write_u32(swjdp, DCB_DCRDR, dcrdr);
 148         retval = swjdp_transaction_endcheck(swjdp);
 149         return retval;
 150 }
 151
 152
 153 int cortex_m3_write_debug_halt_mask(target_t *target, uint32_t mask_on, uint32_t mask_off)
 154 {
 155         /* get pointers to arch-specific information */
 156         armv7m_common_t *armv7m = target->arch_info;
 157         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 158         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 159
 160         /* mask off status bits */
 161         cortex_m3->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off);
 162         /* create new register mask */
 163         cortex_m3->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on;
 164
 165         return mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, cortex_m3->dcb_dhcsr);
 166 }
 167
 168 int cortex_m3_clear_halt(target_t *target)
 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 = &armv7m->swjdp_info;
 174
 175         /* clear step if any */
 176         cortex_m3_write_debug_halt_mask(target, C_HALT, C_STEP);
 177
 178         /* Read Debug Fault Status Register */
 179         mem_ap_read_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 180         /* Clear Debug Fault Status */
 181         mem_ap_write_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
 182         LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m3->nvic_dfsr);
 183
 184         return ERROR_OK;
 185 }
 186
 187 int cortex_m3_single_step_core(target_t *target)
 188 {
 189         /* get pointers to arch-specific information */
 190         armv7m_common_t *armv7m = target->arch_info;
 191         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 192         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 193         uint32_t dhcsr_save;
 194
 195         /* backup dhcsr reg */
 196         dhcsr_save = cortex_m3->dcb_dhcsr;
 197
 198         /* mask interrupts if not done already */
 199         if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
 200                 mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN);
 201         mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN);
 202         LOG_DEBUG(" ");
 203
 204         /* restore dhcsr reg */
 205         cortex_m3->dcb_dhcsr = dhcsr_save;
 206         cortex_m3_clear_halt(target);
 207
 208         return ERROR_OK;
 209 }
 210
 211 int cortex_m3_exec_opcode(target_t *target,uint32_t opcode, int len /* MODE, r0_invalue, &r0_outvalue */)
 212 {
 213         /* get pointers to arch-specific information */
 214         armv7m_common_t *armv7m = target->arch_info;
 215         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 216         uint32_t savedram;
 217         int retvalue;
 218
 219         mem_ap_read_u32(swjdp, 0x20000000, &savedram);
 220         mem_ap_write_u32(swjdp, 0x20000000, opcode);
 221         cortexm3_dap_write_coreregister_u32(swjdp, 0x20000000, 15);
 222         cortex_m3_single_step_core(target);
 223         armv7m->core_cache->reg_list[15].dirty = armv7m->core_cache->reg_list[15].valid;
 224         retvalue = mem_ap_write_atomic_u32(swjdp, 0x20000000, savedram);
 225
 226         return retvalue;
 227 }
 228
 229 #if 0
 230 /* Enable interrupts */
 231 int cortex_m3_cpsie(target_t *target, uint32_t IF)
 232 {
 233         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSIE(IF), 2);
 234 }
 235
 236 /* Disable interrupts */
 237 int cortex_m3_cpsid(target_t *target, uint32_t IF)
 238 {
 239         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSID(IF), 2);
 240 }
 241 #endif
 242
 243 int cortex_m3_endreset_event(target_t *target)
 244 {
 245         int i;
 246         uint32_t dcb_demcr;
 247
 248         /* get pointers to arch-specific information */
 249         armv7m_common_t *armv7m = target->arch_info;
 250         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 251         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 252         cortex_m3_fp_comparator_t *fp_list = cortex_m3->fp_comparator_list;
 253         cortex_m3_dwt_comparator_t *dwt_list = cortex_m3->dwt_comparator_list;
 254
 255         mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
 256         LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "",dcb_demcr);
 257
 258         /* this regsiter is used for emulated dcc channel */
 259         mem_ap_write_u32(swjdp, DCB_DCRDR, 0);
 260
 261         /* Enable debug requests */
 262         mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 263         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 264                 mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN);
 265
 266         /* clear any interrupt masking */
 267         cortex_m3_write_debug_halt_mask(target, 0, C_MASKINTS);
 268
 269         /* Enable trace and dwt */
 270         mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 271         /* Monitor bus faults */
 272         mem_ap_write_u32(swjdp, NVIC_SHCSR, SHCSR_BUSFAULTENA);
 273
 274         /* Enable FPB */
 275         target_write_u32(target, FP_CTRL, 3);
 276         cortex_m3->fpb_enabled = 1;
 277
 278         /* Restore FPB registers */
 279         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 280         {
 281                 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 282         }
 283
 284         /* Restore DWT registers */
 285         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
 286         {
 287                 target_write_u32(target, dwt_list[i].dwt_comparator_address, dwt_list[i].comp);
 288                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x4, dwt_list[i].mask);
 289                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x8, dwt_list[i].function);
 290         }
 291         swjdp_transaction_endcheck(swjdp);
 292
 293         armv7m_invalidate_core_regs(target);
 294
 295         /* make sure we have latest dhcsr flags */
 296         mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 297
 298         return ERROR_OK;
 299 }
 300
 301 int cortex_m3_examine_debug_reason(target_t *target)
 302 {
 303         /* get pointers to arch-specific information */
 304         armv7m_common_t *armv7m = target->arch_info;
 305         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 306
 307         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
 308         /* only check the debug reason if we don't know it already */
 309
 310         if ((target->debug_reason != DBG_REASON_DBGRQ)
 311                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
 312         {
 313                 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
 314                 {
 315                         target->debug_reason = DBG_REASON_BREAKPOINT;
 316                         if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 317                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 318                 }
 319                 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 320                         target->debug_reason = DBG_REASON_WATCHPOINT;
 321                 else if (cortex_m3->nvic_dfsr & DFSR_VCATCH)
 322                         target->debug_reason = DBG_REASON_BREAKPOINT;
 323                 else /* EXTERNAL, HALTED, DWTTRAP w/o BKPT */
 324                         target->debug_reason = DBG_REASON_UNDEFINED;
 325         }
 326
 327         return ERROR_OK;
 328 }
 329
 330 int cortex_m3_examine_exception_reason(target_t *target)
 331 {
 332         uint32_t shcsr, except_sr, cfsr = -1, except_ar = -1;
 333
 334         /* get pointers to arch-specific information */
 335         armv7m_common_t *armv7m = target->arch_info;
 336         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 337
 338         mem_ap_read_u32(swjdp, NVIC_SHCSR, &shcsr);
 339         switch (armv7m->exception_number)
 340         {
 341                 case 2: /* NMI */
 342                         break;
 343                 case 3: /* Hard Fault */
 344                         mem_ap_read_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
 345                         if (except_sr & 0x40000000)
 346                         {
 347                                 mem_ap_read_u32(swjdp, NVIC_CFSR, &cfsr);
 348                         }
 349                         break;
 350                 case 4: /* Memory Management */
 351                         mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
 352                         mem_ap_read_u32(swjdp, NVIC_MMFAR, &except_ar);
 353                         break;
 354                 case 5: /* Bus Fault */
 355                         mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
 356                         mem_ap_read_u32(swjdp, NVIC_BFAR, &except_ar);
 357                         break;
 358                 case 6: /* Usage Fault */
 359                         mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr);
 360                         break;
 361                 case 11:        /* SVCall */
 362                         break;
 363                 case 12:        /* Debug Monitor */
 364                         mem_ap_read_u32(swjdp, NVIC_DFSR, &except_sr);
 365                         break;
 366                 case 14:        /* PendSV */
 367                         break;
 368                 case 15:        /* SysTick */
 369                         break;
 370                 default:
 371                         except_sr = 0;
 372                         break;
 373         }
 374         swjdp_transaction_endcheck(swjdp);
 375         LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32 ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32 "", armv7m_exception_string(armv7m->exception_number), \
 376                 shcsr, except_sr, cfsr, except_ar);
 377         return ERROR_OK;
 378 }
 379
 380 int cortex_m3_debug_entry(target_t *target)
 381 {
 382         int i;
 383         uint32_t xPSR;
 384         int retval;
 385
 386         /* get pointers to arch-specific information */
 387         armv7m_common_t *armv7m = target->arch_info;
 388         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 389         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 390
 391         LOG_DEBUG(" ");
 392         if (armv7m->pre_debug_entry)
 393                 armv7m->pre_debug_entry(target);
 394
 395         cortex_m3_clear_halt(target);
 396         mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 397
 398         if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
 399                 return retval;
 400
 401         /* Examine target state and mode */
 402         /* First load register acessible through core debug port*/
 403         int num_regs = armv7m->core_cache->num_regs;
 404
 405         for (i = 0; i < num_regs; i++)
 406         {
 407                 if (!armv7m->core_cache->reg_list[i].valid)
 408                         armv7m->read_core_reg(target, i);
 409         }
 410
 411         xPSR = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32);
 412
 413 #ifdef ARMV7_GDB_HACKS
 414         /* copy real xpsr reg for gdb, setting thumb bit */
 415         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
 416         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
 417         armv7m_gdb_dummy_cpsr_reg.valid = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 418         armv7m_gdb_dummy_cpsr_reg.dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty;
 419 #endif
 420
 421         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 422         if (xPSR & 0xf00)
 423         {
 424                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 425                 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
 426         }
 427
 428         /* Are we in an exception handler */
 429         if (xPSR & 0x1FF)
 430         {
 431                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 432                 armv7m->exception_number = (xPSR & 0x1FF);
 433         }
 434         else
 435         {
 436                 armv7m->core_mode = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1);
 437                 armv7m->exception_number = 0;
 438         }
 439
 440         if (armv7m->exception_number)
 441         {
 442                 cortex_m3_examine_exception_reason(target);
 443         }
 444
 445         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", target->state: %s",
 446                 armv7m_mode_strings[armv7m->core_mode],
 447                 *(uint32_t*)(armv7m->core_cache->reg_list[15].value),
 448                 target_state_name(target));
 449
 450         if (armv7m->post_debug_entry)
 451                 armv7m->post_debug_entry(target);
 452
 453         return ERROR_OK;
 454 }
 455
 456 int cortex_m3_poll(target_t *target)
 457 {
 458         int retval;
 459         enum target_state prev_target_state = target->state;
 460
 461         /* get pointers to arch-specific information */
 462         armv7m_common_t *armv7m = target->arch_info;
 463         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 464         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 465
 466         /* Read from Debug Halting Control and Status Register */
 467         retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 468         if (retval != ERROR_OK)
 469         {
 470                 target->state = TARGET_UNKNOWN;
 471                 return retval;
 472         }
 473
 474         if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 475         {
 476                 /* check if still in reset */
 477                 mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 478
 479                 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 480                 {
 481                         target->state = TARGET_RESET;
 482                         return ERROR_OK;
 483                 }
 484         }
 485
 486         if (target->state == TARGET_RESET)
 487         {
 488                 /* Cannot switch context while running so endreset is called with target->state == TARGET_RESET */
 489                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32 "", cortex_m3->dcb_dhcsr);
 490                 cortex_m3_endreset_event(target);
 491                 target->state = TARGET_RUNNING;
 492                 prev_target_state = TARGET_RUNNING;
 493         }
 494
 495         if (cortex_m3->dcb_dhcsr & S_HALT)
 496         {
 497                 target->state = TARGET_HALTED;
 498
 499                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
 500                 {
 501                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 502                                 return retval;
 503
 504                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 505                 }
 506                 if (prev_target_state == TARGET_DEBUG_RUNNING)
 507                 {
 508                         LOG_DEBUG(" ");
 509                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 510                                 return retval;
 511
 512                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 513                 }
 514         }
 515
 516         /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state.
 517          * How best to model low power modes?
 518          */
 519
 520         if (target->state == TARGET_UNKNOWN)
 521         {
 522                 /* check if processor is retiring instructions */
 523                 if (cortex_m3->dcb_dhcsr & S_RETIRE_ST)
 524                 {
 525                         target->state = TARGET_RUNNING;
 526                         return ERROR_OK;
 527                 }
 528         }
 529
 530         return ERROR_OK;
 531 }
 532
 533 int cortex_m3_halt(target_t *target)
 534 {
 535         LOG_DEBUG("target->state: %s",
 536                 target_state_name(target));
 537
 538         if (target->state == TARGET_HALTED)
 539         {
 540                 LOG_DEBUG("target was already halted");
 541                 return ERROR_OK;
 542         }
 543
 544         if (target->state == TARGET_UNKNOWN)
 545         {
 546                 LOG_WARNING("target was in unknown state when halt was requested");
 547         }
 548
 549         if (target->state == TARGET_RESET)
 550         {
 551                 if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst())
 552                 {
 553                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 554                         return ERROR_TARGET_FAILURE;
 555                 }
 556                 else
 557                 {
 558                         /* we came here in a reset_halt or reset_init sequence
 559                          * debug entry was already prepared in cortex_m3_prepare_reset_halt()
 560                          */
 561                         target->debug_reason = DBG_REASON_DBGRQ;
 562
 563                         return ERROR_OK;
 564                 }
 565         }
 566
 567         /* Write to Debug Halting Control and Status Register */
 568         cortex_m3_write_debug_halt_mask(target, C_HALT, 0);
 569
 570         target->debug_reason = DBG_REASON_DBGRQ;
 571
 572         return ERROR_OK;
 573 }
 574
 575 int cortex_m3_soft_reset_halt(struct target_s *target)
 576 {
 577         /* get pointers to arch-specific information */
 578         armv7m_common_t *armv7m = target->arch_info;
 579         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 580         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 581         uint32_t dcb_dhcsr = 0;
 582         int retval, timeout = 0;
 583
 584         /* Enter debug state on reset, cf. end_reset_event() */
 585         mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
 586
 587         /* Request a reset */
 588         mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET);
 589         target->state = TARGET_RESET;
 590
 591         /* registers are now invalid */
 592         armv7m_invalidate_core_regs(target);
 593
 594         while (timeout < 100)
 595         {
 596                 retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
 597                 if (retval == ERROR_OK)
 598                 {
 599                         mem_ap_read_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 600                         if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
 601                         {
 602                                 LOG_DEBUG("system reset-halted, dcb_dhcsr 0x%" PRIx32 ", nvic_dfsr 0x%" PRIx32 "", dcb_dhcsr, cortex_m3->nvic_dfsr);
 603                                 cortex_m3_poll(target);
 604                                 return ERROR_OK;
 605                         }
 606                         else
 607                                 LOG_DEBUG("waiting for system reset-halt, dcb_dhcsr 0x%" PRIx32 ", %i ms", dcb_dhcsr, timeout);
 608                 }
 609                 timeout++;
 610                 alive_sleep(1);
 611         }
 612
 613         return ERROR_OK;
 614 }
 615
 616 int cortex_m3_resume(struct target_s *target, int current, uint32_t address, int handle_breakpoints, int debug_execution)
 617 {
 618         /* get pointers to arch-specific information */
 619         armv7m_common_t *armv7m = target->arch_info;
 620         breakpoint_t *breakpoint = NULL;
 621         uint32_t resume_pc;
 622
 623         if (target->state != TARGET_HALTED)
 624         {
 625                 LOG_WARNING("target not halted");
 626                 return ERROR_TARGET_NOT_HALTED;
 627         }
 628
 629         if (!debug_execution)
 630         {
 631                 target_free_all_working_areas(target);
 632                 cortex_m3_enable_breakpoints(target);
 633                 cortex_m3_enable_watchpoints(target);
 634         }
 635
 636         if (debug_execution)
 637         {
 638                 /* Disable interrupts */
 639                 /* We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
 640                  * This is probably the same issue as Cortex-M3 Errata  377493:
 641                  * C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken. */
 642                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 643                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
 644                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = 1;
 645
 646                 /* Make sure we are in Thumb mode */
 647                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 648                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1 << 24));
 649                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = 1;
 650                 armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = 1;
 651         }
 652
 653         /* current = 1: continue on current pc, otherwise continue at <address> */
 654         if (!current)
 655         {
 656                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 657                 armv7m->core_cache->reg_list[15].dirty = 1;
 658                 armv7m->core_cache->reg_list[15].valid = 1;
 659         }
 660
 661         resume_pc = buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32);
 662
 663         armv7m_restore_context(target);
 664
 665         /* the front-end may request us not to handle breakpoints */
 666         if (handle_breakpoints)
 667         {
 668                 /* Single step past breakpoint at current address */
 669                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 670                 {
 671                         LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 " (ID: %d)",
 672                                           breakpoint->address,
 673                                           breakpoint->unique_id );
 674                         cortex_m3_unset_breakpoint(target, breakpoint);
 675                         cortex_m3_single_step_core(target);
 676                         cortex_m3_set_breakpoint(target, breakpoint);
 677                 }
 678         }
 679
 680         /* Restart core */
 681         cortex_m3_write_debug_halt_mask(target, 0, C_HALT);
 682
 683         target->debug_reason = DBG_REASON_NOTHALTED;
 684
 685         /* registers are now invalid */
 686         armv7m_invalidate_core_regs(target);
 687         if (!debug_execution)
 688         {
 689                 target->state = TARGET_RUNNING;
 690                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 691                 LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
 692         }
 693         else
 694         {
 695                 target->state = TARGET_DEBUG_RUNNING;
 696                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 697                 LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
 698         }
 699
 700         return ERROR_OK;
 701 }
 702
 703 /* int irqstepcount = 0; */
 704 int cortex_m3_step(struct target_s *target, int current, uint32_t address, int handle_breakpoints)
 705 {
 706         /* get pointers to arch-specific information */
 707         armv7m_common_t *armv7m = target->arch_info;
 708         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 709         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 710         breakpoint_t *breakpoint = NULL;
 711
 712         if (target->state != TARGET_HALTED)
 713         {
 714                 LOG_WARNING("target not halted");
 715                 return ERROR_TARGET_NOT_HALTED;
 716         }
 717
 718         /* current = 1: continue on current pc, otherwise continue at <address> */
 719         if (!current)
 720                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 721
 722         /* the front-end may request us not to handle breakpoints */
 723         if (handle_breakpoints)
 724                 if ((breakpoint = breakpoint_find(target, buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32))))
 725                         cortex_m3_unset_breakpoint(target, breakpoint);
 726
 727         target->debug_reason = DBG_REASON_SINGLESTEP;
 728
 729         armv7m_restore_context(target);
 730
 731         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 732
 733         /* set step and clear halt */
 734         cortex_m3_write_debug_halt_mask(target, C_STEP, C_HALT);
 735         mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 736
 737         /* registers are now invalid */
 738         armv7m_invalidate_core_regs(target);
 739
 740         if (breakpoint)
 741                 cortex_m3_set_breakpoint(target, breakpoint);
 742
 743         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32 " nvic_icsr = 0x%" PRIx32 "", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 744
 745         cortex_m3_debug_entry(target);
 746         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 747
 748         LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32 " nvic_icsr = 0x%" PRIx32 "", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 749         return ERROR_OK;
 750 }
 751
 752 int cortex_m3_assert_reset(target_t *target)
 753 {
 754         armv7m_common_t *armv7m = target->arch_info;
 755         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 756         swjdp_common_t *swjdp = &armv7m->swjdp_info;
 757         int assert_srst = 1;
 758
 759         LOG_DEBUG("target->state: %s",
 760                 target_state_name(target));
 761
 762         enum reset_types jtag_reset_config = jtag_get_reset_config();
 763         if (!(jtag_reset_config & RESET_HAS_SRST))
 764         {
 765                 LOG_ERROR("Can't assert SRST");
 766                 return ERROR_FAIL;
 767         }
 768
 769         /* Enable debug requests */
 770         mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 771         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 772                 mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN);
 773
 774         mem_ap_write_u32(swjdp, DCB_DCRDR, 0);
 775
 776         if (!target->reset_halt)
 777         {
 778                 /* Set/Clear C_MASKINTS in a separate operation */
 779                 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 780                         mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT);
 781
 782                 /* clear any debug flags before resuming */
 783                 cortex_m3_clear_halt(target);
 784
 785                 /* clear C_HALT in dhcsr reg */
 786                 cortex_m3_write_debug_halt_mask(target, 0, C_HALT);
 787
 788                 /* Enter debug state on reset, cf. end_reset_event() */
 789                 mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 790         }
 791         else
 792         {
 793                 /* Enter debug state on reset, cf. end_reset_event() */
 794                 mem_ap_write_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
 795         }
 796
 797         /* following hack is to handle luminary reset
 798          * when srst is asserted the luminary device seesm to also clear the debug registers
 799          * which does not match the armv7 debug TRM */
 800
 801         if (strcmp(target->variant, "lm3s") == 0)
 802         {
 803                 /* get revision of lm3s target, only early silicon has this issue
 804                  * Fury Rev B, DustDevil Rev B, Tempest all ok */
 805
 806                 uint32_t did0;
 807
 808                 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
 809                 {
 810                         switch ((did0 >> 16) & 0xff)
 811                         {
 812                                 case 0:
 813                                         /* all Sandstorm suffer issue */
 814                                         assert_srst = 0;
 815                                         break;
 816
 817                                 case 1:
 818                                 case 3:
 819                                         /* only Fury/DustDevil rev A suffer reset problems */
 820                                         if (((did0 >> 8) & 0xff) == 0)
 821                                                 assert_srst = 0;
 822                                         break;
 823                         }
 824                 }
 825         }
 826
 827         if (assert_srst)
 828         {
 829                 /* default to asserting srst */
 830                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 831                 {
 832                         jtag_add_reset(1, 1);
 833                 }
 834                 else
 835                 {
 836                         jtag_add_reset(0, 1);
 837                 }
 838         }
 839         else
 840         {
 841                 /* this causes the luminary device to reset using the watchdog */
 842                 mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
 843                 LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
 844
 845                 {
 846                         /* I do not know why this is necessary, but it fixes strange effects
 847                          * (step/resume cause a NMI after reset) on LM3S6918 -- Michael Schwingen */
 848                         uint32_t tmp;
 849                         mem_ap_read_atomic_u32(swjdp, NVIC_AIRCR, &tmp);
 850                 }
 851         }
 852
 853         target->state = TARGET_RESET;
 854         jtag_add_sleep(50000);
 855
 856         armv7m_invalidate_core_regs(target);
 857
 858         if (target->reset_halt)
 859         {
 860                 int retval;
 861                 if ((retval = target_halt(target)) != ERROR_OK)
 862                         return retval;
 863         }
 864
 865         return ERROR_OK;
 866 }
 867
 868 int cortex_m3_deassert_reset(target_t *target)
 869 {
 870         LOG_DEBUG("target->state: %s",
 871                 target_state_name(target));
 872
 873         /* deassert reset lines */
 874         jtag_add_reset(0, 0);
 875
 876         return ERROR_OK;
 877 }
 878
 879 void cortex_m3_enable_breakpoints(struct target_s *target)
 880 {
 881         breakpoint_t *breakpoint = target->breakpoints;
 882
 883         /* set any pending breakpoints */
 884         while (breakpoint)
 885         {
 886                 if (breakpoint->set == 0)
 887                         cortex_m3_set_breakpoint(target, breakpoint);
 888                 breakpoint = breakpoint->next;
 889         }
 890 }
 891
 892 int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 893 {
 894         int retval;
 895         int fp_num = 0;
 896         uint32_t hilo;
 897
 898         /* get pointers to arch-specific information */
 899         armv7m_common_t *armv7m = target->arch_info;
 900         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 901
 902         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 903
 904         if (breakpoint->set)
 905         {
 906                 LOG_WARNING("breakpoint (BPID: %d) already set", breakpoint->unique_id);
 907                 return ERROR_OK;
 908         }
 909
 910         if (cortex_m3->auto_bp_type)
 911         {
 912                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 913         }
 914
 915         if (breakpoint->type == BKPT_HARD)
 916         {
 917                 while (comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
 918                         fp_num++;
 919                 if (fp_num >= cortex_m3->fp_num_code)
 920                 {
 921                         LOG_DEBUG("ERROR Can not find free FP Comparator");
 922                         LOG_WARNING("ERROR Can not find free FP Comparator");
 923                         exit(-1);
 924                 }
 925                 breakpoint->set = fp_num + 1;
 926                 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
 927                 comparator_list[fp_num].used = 1;
 928                 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 929                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 930                 LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "", fp_num, comparator_list[fp_num].fpcr_value);
 931                 if (!cortex_m3->fpb_enabled)
 932                 {
 933                         LOG_DEBUG("FPB wasn't enabled, do it now");
 934                         target_write_u32(target, FP_CTRL, 3);
 935                 }
 936         }
 937         else if (breakpoint->type == BKPT_SOFT)
 938         {
 939                 uint8_t code[4];
 940                 buf_set_u32(code, 0, 32, ARMV7M_T_BKPT(0x11));
 941                 if ((retval = target_read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr)) != ERROR_OK)
 942                 {
 943                         return retval;
 944                 }
 945                 if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code)) != ERROR_OK)
 946                 {
 947                         return retval;
 948                 }
 949                 breakpoint->set = 0x11; /* Any nice value but 0 */
 950         }
 951
 952         LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
 953                           breakpoint->unique_id,
 954                           (int)(breakpoint->type),
 955                           breakpoint->address,
 956                           breakpoint->length,
 957                           breakpoint->set);
 958
 959         return ERROR_OK;
 960 }
 961
 962 int cortex_m3_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 963 {
 964         int retval;
 965         /* get pointers to arch-specific information */
 966         armv7m_common_t *armv7m = target->arch_info;
 967         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 968         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 969
 970         if (!breakpoint->set)
 971         {
 972                 LOG_WARNING("breakpoint not set");
 973                 return ERROR_OK;
 974         }
 975
 976         LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)",
 977                           breakpoint->unique_id,
 978                           (int)(breakpoint->type),
 979                           breakpoint->address,
 980                           breakpoint->length,
 981                           breakpoint->set);
 982
 983         if (breakpoint->type == BKPT_HARD)
 984         {
 985                 int fp_num = breakpoint->set - 1;
 986                 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
 987                 {
 988                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
 989                         return ERROR_OK;
 990                 }
 991                 comparator_list[fp_num].used = 0;
 992                 comparator_list[fp_num].fpcr_value = 0;
 993                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 994         }
 995         else
 996         {
 997                 /* restore original instruction (kept in target endianness) */
 998                 if (breakpoint->length == 4)
 999                 {
1000                         if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
1001                         {
1002                                 return retval;
1003                         }
1004                 }
1005                 else
1006                 {
1007                         if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
1008                         {
1009                                 return retval;
1010                         }
1011                 }
1012         }
1013         breakpoint->set = 0;
1014
1015         return ERROR_OK;
1016 }
1017
1018 int cortex_m3_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
1019 {
1020         /* get pointers to arch-specific information */
1021         armv7m_common_t *armv7m = target->arch_info;
1022         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1023
1024         if (cortex_m3->auto_bp_type)
1025         {
1026                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
1027 #ifdef ARMV7_GDB_HACKS
1028                 if (breakpoint->length != 2) {
1029                         /* XXX Hack: Replace all breakpoints with length != 2 with
1030                          * a hardware breakpoint. */
1031                         breakpoint->type = BKPT_HARD;
1032                         breakpoint->length = 2;
1033                 }
1034 #endif
1035         }
1036
1037         if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
1038         {
1039                 LOG_INFO("flash patch comparator requested outside code memory region");
1040                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1041         }
1042
1043         if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
1044         {
1045                 LOG_INFO("soft breakpoint requested in code (flash) memory region");
1046                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1047         }
1048
1049         if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
1050         {
1051                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
1052                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1053         }
1054
1055         if ((breakpoint->length != 2))
1056         {
1057                 LOG_INFO("only breakpoints of two bytes length supported");
1058                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1059         }
1060
1061         if (breakpoint->type == BKPT_HARD)
1062                 cortex_m3->fp_code_available--;
1063         cortex_m3_set_breakpoint(target, breakpoint);
1064
1065         return ERROR_OK;
1066 }
1067
1068 int cortex_m3_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
1069 {
1070         /* get pointers to arch-specific information */
1071         armv7m_common_t *armv7m = target->arch_info;
1072         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1073
1074         if (target->state != TARGET_HALTED)
1075         {
1076                 LOG_WARNING("target not halted");
1077                 return ERROR_TARGET_NOT_HALTED;
1078         }
1079
1080         if (cortex_m3->auto_bp_type)
1081         {
1082                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
1083         }
1084
1085         if (breakpoint->set)
1086         {
1087                 cortex_m3_unset_breakpoint(target, breakpoint);
1088         }
1089
1090         if (breakpoint->type == BKPT_HARD)
1091                 cortex_m3->fp_code_available++;
1092
1093         return ERROR_OK;
1094 }
1095
1096 int cortex_m3_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1097 {
1098         int dwt_num = 0;
1099         uint32_t mask, temp;
1100
1101         /* get pointers to arch-specific information */
1102         armv7m_common_t *armv7m = target->arch_info;
1103         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1104         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1105
1106         if (watchpoint->set)
1107         {
1108                 LOG_WARNING("watchpoint (%d) already set", watchpoint->unique_id );
1109                 return ERROR_OK;
1110         }
1111
1112         if (watchpoint->mask == 0xffffffffu)
1113         {
1114                 while (comparator_list[dwt_num].used && (dwt_num < cortex_m3->dwt_num_comp))
1115                         dwt_num++;
1116                 if (dwt_num >= cortex_m3->dwt_num_comp)
1117                 {
1118                         LOG_DEBUG("ERROR Can not find free DWT Comparator");
1119                         LOG_WARNING("ERROR Can not find free DWT Comparator");
1120                         return -1;
1121                 }
1122                 watchpoint->set = dwt_num + 1;
1123                 mask = 0;
1124                 temp = watchpoint->length;
1125                 while (temp > 1)
1126                 {
1127                         temp = temp / 2;
1128                         mask++;
1129                 }
1130                 comparator_list[dwt_num].used = 1;
1131                 comparator_list[dwt_num].comp = watchpoint->address;
1132                 comparator_list[dwt_num].mask = mask;
1133                 comparator_list[dwt_num].function = watchpoint->rw + 5;
1134                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address, comparator_list[dwt_num].comp);
1135                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address | 0x4, comparator_list[dwt_num].mask);
1136                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address | 0x8, comparator_list[dwt_num].function);
1137                 LOG_DEBUG("dwt_num %i 0x%" PRIx32 " 0x%" PRIx32 " 0x%" PRIx32 "", dwt_num, comparator_list[dwt_num].comp, comparator_list[dwt_num].mask, comparator_list[dwt_num].function);
1138         }
1139         else
1140         {
1141                 /* Move this test to add_watchpoint */
1142                 LOG_WARNING("Cannot watch data values (id: %d)",
1143                                   watchpoint->unique_id );
1144                 return ERROR_OK;
1145         }
1146         LOG_DEBUG("Watchpoint (ID: %d) address: 0x%08" PRIx32 " set=%d ",
1147                           watchpoint->unique_id, watchpoint->address, watchpoint->set );
1148         return ERROR_OK;
1149
1150 }
1151
1152 int cortex_m3_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1153 {
1154         /* get pointers to arch-specific information */
1155         armv7m_common_t *armv7m = target->arch_info;
1156         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1157         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1158         int dwt_num;
1159
1160         if (!watchpoint->set)
1161         {
1162                 LOG_WARNING("watchpoint (wpid: %d) not set", watchpoint->unique_id );
1163                 return ERROR_OK;
1164         }
1165
1166         LOG_DEBUG("Watchpoint (ID: %d) address: 0x%08" PRIx32 " set=%d ",
1167                           watchpoint->unique_id, watchpoint->address,watchpoint->set );
1168
1169         dwt_num = watchpoint->set - 1;
1170
1171         if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1172         {
1173                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1174                 return ERROR_OK;
1175         }
1176         comparator_list[dwt_num].used = 0;
1177         comparator_list[dwt_num].function = 0;
1178         target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address | 0x8, comparator_list[dwt_num].function);
1179
1180         watchpoint->set = 0;
1181
1182         return ERROR_OK;
1183 }
1184
1185 int cortex_m3_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1186 {
1187         /* get pointers to arch-specific information */
1188         armv7m_common_t *armv7m = target->arch_info;
1189         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1190
1191         if (target->state != TARGET_HALTED)
1192         {
1193                 LOG_WARNING("target not halted");
1194                 return ERROR_TARGET_NOT_HALTED;
1195         }
1196
1197         if (cortex_m3->dwt_comp_available < 1)
1198         {
1199                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1200         }
1201
1202         if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
1203         {
1204                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1205         }
1206
1207         cortex_m3->dwt_comp_available--;
1208         LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available);
1209
1210         return ERROR_OK;
1211 }
1212
1213 int cortex_m3_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1214 {
1215         /* get pointers to arch-specific information */
1216         armv7m_common_t *armv7m = target->arch_info;
1217         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1218
1219         if (target->state != TARGET_HALTED)
1220         {
1221                 LOG_WARNING("target not halted");
1222                 return ERROR_TARGET_NOT_HALTED;
1223         }
1224
1225         if (watchpoint->set)
1226         {
1227                 cortex_m3_unset_watchpoint(target, watchpoint);
1228         }
1229
1230         cortex_m3->dwt_comp_available++;
1231         LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available);
1232
1233         return ERROR_OK;
1234 }
1235
1236 void cortex_m3_enable_watchpoints(struct target_s *target)
1237 {
1238         watchpoint_t *watchpoint = target->watchpoints;
1239
1240         /* set any pending watchpoints */
1241         while (watchpoint)
1242         {
1243                 if (watchpoint->set == 0)
1244                         cortex_m3_set_watchpoint(target, watchpoint);
1245                 watchpoint = watchpoint->next;
1246         }
1247 }
1248
1249 int cortex_m3_load_core_reg_u32(struct target_s *target, enum armv7m_regtype type, uint32_t num, uint32_t * value)
1250 {
1251         int retval;
1252         /* get pointers to arch-specific information */
1253         armv7m_common_t *armv7m = target->arch_info;
1254         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1255
1256         /* NOTE:  we "know" here that the register identifiers used
1257          * in the v7m header match the Cortex-M3 Debug Core Register
1258          * Selector values for R0..R15, xPSR, MSP, and PSP.
1259          */
1260         switch (num) {
1261         case 0 ... 18:
1262                 /* read a normal core register */
1263                 retval = cortexm3_dap_read_coreregister_u32(swjdp, value, num);
1264
1265                 if (retval != ERROR_OK)
1266                 {
1267                         LOG_ERROR("JTAG failure %i",retval);
1268                         return ERROR_JTAG_DEVICE_ERROR;
1269                 }
1270                 LOG_DEBUG("load from core reg %i  value 0x%" PRIx32 "",(int)num,*value);
1271                 break;
1272
1273         case ARMV7M_PRIMASK:
1274         case ARMV7M_BASEPRI:
1275         case ARMV7M_FAULTMASK:
1276         case ARMV7M_CONTROL:
1277                 /* Cortex-M3 packages these four registers as bitfields
1278                  * in one Debug Core register.  So say r0 and r2 docs;
1279                  * it was removed from r1 docs, but still works.
1280                  */
1281                 cortexm3_dap_read_coreregister_u32(swjdp, value, 20);
1282
1283                 switch (num)
1284                 {
1285                         case ARMV7M_PRIMASK:
1286                                 *value = buf_get_u32((uint8_t*)value, 0, 1);
1287                                 break;
1288
1289                         case ARMV7M_BASEPRI:
1290                                 *value = buf_get_u32((uint8_t*)value, 8, 8);
1291                                 break;
1292
1293                         case ARMV7M_FAULTMASK:
1294                                 *value = buf_get_u32((uint8_t*)value, 16, 1);
1295                                 break;
1296
1297                         case ARMV7M_CONTROL:
1298                                 *value = buf_get_u32((uint8_t*)value, 24, 2);
1299                                 break;
1300                 }
1301
1302                 LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "", (int)num, *value);
1303                 break;
1304
1305         default:
1306                 return ERROR_INVALID_ARGUMENTS;
1307         }
1308
1309         return ERROR_OK;
1310 }
1311
1312 int cortex_m3_store_core_reg_u32(struct target_s *target, enum armv7m_regtype type, uint32_t num, uint32_t value)
1313 {
1314         int retval;
1315         uint32_t reg;
1316
1317         /* get pointers to arch-specific information */
1318         armv7m_common_t *armv7m = target->arch_info;
1319         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1320
1321 #ifdef ARMV7_GDB_HACKS
1322         /* If the LR register is being modified, make sure it will put us
1323          * in "thumb" mode, or an INVSTATE exception will occur. This is a
1324          * hack to deal with the fact that gdb will sometimes "forge"
1325          * return addresses, and doesn't set the LSB correctly (i.e., when
1326          * printing expressions containing function calls, it sets LR = 0.)
1327          * Valid exception return codes have bit 0 set too.
1328          */
1329         if (num == ARMV7M_R14)
1330                 value |= 0x01;
1331 #endif
1332
1333         /* NOTE:  we "know" here that the register identifiers used
1334          * in the v7m header match the Cortex-M3 Debug Core Register
1335          * Selector values for R0..R15, xPSR, MSP, and PSP.
1336          */
1337         switch (num) {
1338         case 0 ... 18:
1339                 retval = cortexm3_dap_write_coreregister_u32(swjdp, value, num);
1340                 if (retval != ERROR_OK)
1341                 {
1342                         LOG_ERROR("JTAG failure %i", retval);
1343                         armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
1344                         return ERROR_JTAG_DEVICE_ERROR;
1345                 }
1346                 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value);
1347                 break;
1348
1349         case ARMV7M_PRIMASK:
1350         case ARMV7M_BASEPRI:
1351         case ARMV7M_FAULTMASK:
1352         case ARMV7M_CONTROL:
1353                 /* Cortex-M3 packages these four registers as bitfields
1354                  * in one Debug Core register.  So say r0 and r2 docs;
1355                  * it was removed from r1 docs, but still works.
1356                  */
1357                 cortexm3_dap_read_coreregister_u32(swjdp, &reg, 20);
1358
1359                 switch (num)
1360                 {
1361                         case ARMV7M_PRIMASK:
1362                                 buf_set_u32((uint8_t*)&reg, 0, 1, value);
1363                                 break;
1364
1365                         case ARMV7M_BASEPRI:
1366                                 buf_set_u32((uint8_t*)&reg, 8, 8, value);
1367                                 break;
1368
1369                         case ARMV7M_FAULTMASK:
1370                                 buf_set_u32((uint8_t*)&reg, 16, 1, value);
1371                                 break;
1372
1373                         case ARMV7M_CONTROL:
1374                                 buf_set_u32((uint8_t*)&reg, 24, 2, value);
1375                                 break;
1376                 }
1377
1378                 cortexm3_dap_write_coreregister_u32(swjdp, reg, 20);
1379
1380                 LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value);
1381                 break;
1382
1383         default:
1384                 return ERROR_INVALID_ARGUMENTS;
1385         }
1386
1387         return ERROR_OK;
1388 }
1389
1390 int cortex_m3_read_memory(struct target_s *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
1391 {
1392         /* get pointers to arch-specific information */
1393         armv7m_common_t *armv7m = target->arch_info;
1394         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1395         int retval;
1396
1397         /* sanitize arguments */
1398         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1399                 return ERROR_INVALID_ARGUMENTS;
1400
1401         /* cortex_m3 handles unaligned memory access */
1402
1403         switch (size)
1404         {
1405                 case 4:
1406                         retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
1407                         break;
1408                 case 2:
1409                         retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
1410                         break;
1411                 case 1:
1412                         retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
1413                         break;
1414                 default:
1415                         LOG_ERROR("BUG: we shouldn't get here");
1416                         exit(-1);
1417         }
1418
1419         return retval;
1420 }
1421
1422 int cortex_m3_write_memory(struct target_s *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
1423 {
1424         /* get pointers to arch-specific information */
1425         armv7m_common_t *armv7m = target->arch_info;
1426         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1427         int retval;
1428
1429         /* sanitize arguments */
1430         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1431                 return ERROR_INVALID_ARGUMENTS;
1432
1433         switch (size)
1434         {
1435                 case 4:
1436                         retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
1437                         break;
1438                 case 2:
1439                         retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
1440                         break;
1441                 case 1:
1442                         retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
1443                         break;
1444                 default:
1445                         LOG_ERROR("BUG: we shouldn't get here");
1446                         exit(-1);
1447         }
1448
1449         return retval;
1450 }
1451
1452 int cortex_m3_bulk_write_memory(target_t *target, uint32_t address, uint32_t count, uint8_t *buffer)
1453 {
1454         return cortex_m3_write_memory(target, address, 4, count, buffer);
1455 }
1456
1457 void cortex_m3_build_reg_cache(target_t *target)
1458 {
1459         armv7m_build_reg_cache(target);
1460 }
1461
1462 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
1463 {
1464         cortex_m3_build_reg_cache(target);
1465         return ERROR_OK;
1466 }
1467
1468 int cortex_m3_examine(struct target_s *target)
1469 {
1470         int retval;
1471         uint32_t cpuid, fpcr, dwtcr, ictr;
1472         int i;
1473
1474         /* get pointers to arch-specific information */
1475         armv7m_common_t *armv7m = target->arch_info;
1476         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1477         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1478
1479         if ((retval = ahbap_debugport_init(swjdp)) != ERROR_OK)
1480                 return retval;
1481
1482         if (!target_was_examined(target))
1483         {
1484                 target_set_examined(target);
1485
1486                 /* Read from Device Identification Registers */
1487                 if ((retval = target_read_u32(target, CPUID, &cpuid)) != ERROR_OK)
1488                         return retval;
1489
1490                 if (((cpuid >> 4) & 0xc3f) == 0xc23)
1491                         LOG_DEBUG("CORTEX-M3 processor detected");
1492                 LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid);
1493
1494                 target_read_u32(target, NVIC_ICTR, &ictr);
1495                 cortex_m3->intlinesnum = (ictr & 0x1F) + 1;
1496                 cortex_m3->intsetenable = calloc(cortex_m3->intlinesnum, 4);
1497                 for (i = 0; i < cortex_m3->intlinesnum; i++)
1498                 {
1499                         target_read_u32(target, NVIC_ISE0 + 4 * i, cortex_m3->intsetenable + i);
1500                         LOG_DEBUG("interrupt enable[%i] = 0x%8.8" PRIx32 "", i, cortex_m3->intsetenable[i]);
1501                 }
1502
1503                 /* Setup FPB */
1504                 target_read_u32(target, FP_CTRL, &fpcr);
1505                 cortex_m3->auto_bp_type = 1;
1506                 cortex_m3->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF); /* bits [14:12] and [7:4] */
1507                 cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1508                 cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1509                 cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
1510                 cortex_m3->fpb_enabled = fpcr & 1;
1511                 for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1512                 {
1513                         cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1514                         cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1515                 }
1516                 LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1517
1518                 /* Setup DWT */
1519                 target_read_u32(target, DWT_CTRL, &dwtcr);
1520                 cortex_m3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1521                 cortex_m3->dwt_comp_available = cortex_m3->dwt_num_comp;
1522                 cortex_m3->dwt_comparator_list = calloc(cortex_m3->dwt_num_comp, sizeof(cortex_m3_dwt_comparator_t));
1523                 for (i = 0; i < cortex_m3->dwt_num_comp; i++)
1524                 {
1525                         cortex_m3->dwt_comparator_list[i].dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1526                 }
1527         }
1528
1529         return ERROR_OK;
1530 }
1531
1532 int cortex_m3_quit(void)
1533 {
1534
1535         return ERROR_OK;
1536 }
1537
1538 int cortex_m3_dcc_read(swjdp_common_t *swjdp, uint8_t *value, uint8_t *ctrl)
1539 {
1540         uint16_t dcrdr;
1541
1542         mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1543         *ctrl = (uint8_t)dcrdr;
1544         *value = (uint8_t)(dcrdr >> 8);
1545
1546         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1547
1548         /* write ack back to software dcc register
1549          * signify we have read data */
1550         if (dcrdr & (1 << 0))
1551         {
1552                 dcrdr = 0;
1553                 mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1554         }
1555
1556         return ERROR_OK;
1557 }
1558
1559 int cortex_m3_target_request_data(target_t *target, uint32_t size, uint8_t *buffer)
1560 {
1561         armv7m_common_t *armv7m = target->arch_info;
1562         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1563         uint8_t data;
1564         uint8_t ctrl;
1565         uint32_t i;
1566
1567         for (i = 0; i < (size * 4); i++)
1568         {
1569                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1570                 buffer[i] = data;
1571         }
1572
1573         return ERROR_OK;
1574 }
1575
1576 int cortex_m3_handle_target_request(void *priv)
1577 {
1578         target_t *target = priv;
1579         if (!target_was_examined(target))
1580                 return ERROR_OK;
1581         armv7m_common_t *armv7m = target->arch_info;
1582         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1583
1584         if (!target->dbg_msg_enabled)
1585                 return ERROR_OK;
1586
1587         if (target->state == TARGET_RUNNING)
1588         {
1589                 uint8_t data;
1590                 uint8_t ctrl;
1591
1592                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1593
1594                 /* check if we have data */
1595                 if (ctrl & (1 << 0))
1596                 {
1597                         uint32_t request;
1598
1599                         /* we assume target is quick enough */
1600                         request = data;
1601                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1602                         request |= (data << 8);
1603                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1604                         request |= (data << 16);
1605                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1606                         request |= (data << 24);
1607                         target_request(target, request);
1608                 }
1609         }
1610
1611         return ERROR_OK;
1612 }
1613
1614 int cortex_m3_init_arch_info(target_t *target, cortex_m3_common_t *cortex_m3, jtag_tap_t *tap)
1615 {
1616         int retval;
1617         armv7m_common_t *armv7m;
1618         armv7m = &cortex_m3->armv7m;
1619
1620         armv7m_init_arch_info(target, armv7m);
1621
1622         /* prepare JTAG information for the new target */
1623         cortex_m3->jtag_info.tap = tap;
1624         cortex_m3->jtag_info.scann_size = 4;
1625
1626         armv7m->swjdp_info.dp_select_value = -1;
1627         armv7m->swjdp_info.ap_csw_value = -1;
1628         armv7m->swjdp_info.ap_tar_value = -1;
1629         armv7m->swjdp_info.jtag_info = &cortex_m3->jtag_info;
1630         armv7m->swjdp_info.memaccess_tck = 8;
1631         armv7m->swjdp_info.tar_autoincr_block = (1 << 12);      /* Cortex-M3 has 4096 bytes autoincrement range */
1632
1633         /* initialize arch-specific breakpoint handling */
1634
1635         cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC;
1636         cortex_m3->arch_info = NULL;
1637
1638         /* register arch-specific functions */
1639         armv7m->examine_debug_reason = cortex_m3_examine_debug_reason;
1640
1641         armv7m->pre_debug_entry = NULL;
1642         armv7m->post_debug_entry = NULL;
1643
1644         armv7m->pre_restore_context = NULL;
1645         armv7m->post_restore_context = NULL;
1646
1647         armv7m->arch_info = cortex_m3;
1648         armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;
1649         armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32;
1650
1651         target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target);
1652
1653         if ((retval = arm_jtag_setup_connection(&cortex_m3->jtag_info)) != ERROR_OK)
1654         {
1655                 return retval;
1656         }
1657
1658         return ERROR_OK;
1659 }
1660
1661 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp)
1662 {
1663         cortex_m3_common_t *cortex_m3 = calloc(1,sizeof(cortex_m3_common_t));
1664
1665         cortex_m3_init_arch_info(target, cortex_m3, target->tap);
1666
1667         return ERROR_OK;
1668 }
1669
1670 /*
1671  * REVISIT Thumb2 disassembly should work for all ARMv7 cores, as well
1672  * as at least ARM-1156T2.  The interesting thing about Cortex-M is
1673  * that *only* Thumb2 disassembly matters.  There are also some small
1674  * additions to Thumb2 that are specific to ARMv7-M.
1675  */
1676 static int
1677 handle_cortex_m3_disassemble_command(struct command_context_s *cmd_ctx,
1678                 char *cmd, char **args, int argc)
1679 {
1680         int retval = ERROR_OK;
1681         target_t *target = get_current_target(cmd_ctx);
1682         uint32_t address;
1683         unsigned long count;
1684         arm_instruction_t cur_instruction;
1685
1686         if (argc != 2) {
1687                 command_print(cmd_ctx,
1688                         "usage: cortex_m3 disassemble <address> <count>");
1689                 return ERROR_OK;
1690         }
1691
1692         errno = 0;
1693         address = strtoul(args[0], NULL, 0);
1694         if (errno)
1695                 return ERROR_FAIL;
1696         count = strtoul(args[1], NULL, 0);
1697         if (errno)
1698                 return ERROR_FAIL;
1699
1700         while (count--) {
1701                 retval = thumb2_opcode(target, address, &cur_instruction);
1702                 if (retval != ERROR_OK)
1703                         return retval;
1704                 command_print(cmd_ctx, "%s", cur_instruction.text);
1705                 address += cur_instruction.instruction_size;
1706         }
1707
1708         return ERROR_OK;
1709 }
1710
1711 static const struct {
1712         char name[10];
1713         unsigned mask;
1714 } vec_ids[] = {
1715         { "hard_err",   VC_HARDERR, },
1716         { "int_err",    VC_INTERR, },
1717         { "bus_err",    VC_BUSERR, },
1718         { "state_err",  VC_STATERR, },
1719         { "chk_err",    VC_CHKERR, },
1720         { "nocp_err",   VC_NOCPERR, },
1721         { "mm_err",     VC_MMERR, },
1722         { "reset",      VC_CORERESET, },
1723 };
1724
1725 static int
1726 handle_cortex_m3_vector_catch_command(struct command_context_s *cmd_ctx,
1727                 char *cmd, char **argv, int argc)
1728 {
1729         target_t *target = get_current_target(cmd_ctx);
1730         armv7m_common_t *armv7m = target->arch_info;
1731         swjdp_common_t *swjdp = &armv7m->swjdp_info;
1732         uint32_t demcr = 0;
1733         int i;
1734
1735         mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr);
1736
1737         if (argc > 0) {
1738                 unsigned catch = 0;
1739
1740                 if (argc == 1) {
1741                         if (strcmp(argv[0], "all") == 0) {
1742                                 catch = VC_HARDERR | VC_INTERR | VC_BUSERR
1743                                         | VC_STATERR | VC_CHKERR | VC_NOCPERR
1744                                         | VC_MMERR | VC_CORERESET;
1745                                 goto write;
1746                         } else if (strcmp(argv[0], "none") == 0) {
1747                                 goto write;
1748                         }
1749                 }
1750                 while (argc-- > 0) {
1751                         for (i = 0; i < ARRAY_SIZE(vec_ids); i++) {
1752                                 if (strcmp(argv[argc], vec_ids[i].name) != 0)
1753                                         continue;
1754                                 catch |= vec_ids[i].mask;
1755                                 break;
1756                         }
1757                         if (i == ARRAY_SIZE(vec_ids)) {
1758                                 LOG_ERROR("No CM3 vector '%s'", argv[argc]);
1759                                 return ERROR_INVALID_ARGUMENTS;
1760                         }
1761                 }
1762 write:
1763                 demcr &= ~0xffff;
1764                 demcr |= catch;
1765
1766                 /* write, but don't assume it stuck */
1767                 mem_ap_write_u32(swjdp, DCB_DEMCR, demcr);
1768                 mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr);
1769         }
1770
1771         for (i = 0; i < ARRAY_SIZE(vec_ids); i++)
1772                 command_print(cmd_ctx, "%9s: %s", vec_ids[i].name,
1773                         (demcr & vec_ids[i].mask) ? "catch" : "ignore");
1774
1775         return ERROR_OK;
1776 }
1777
1778 int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
1779 {
1780         int retval;
1781         command_t *cortex_m3_cmd;
1782
1783         retval = armv7m_register_commands(cmd_ctx);
1784
1785         cortex_m3_cmd = register_command(cmd_ctx, NULL, "cortex_m3",
1786                         NULL, COMMAND_ANY, "cortex_m3 specific commands");
1787
1788         register_command(cmd_ctx, cortex_m3_cmd, "disassemble",
1789                         handle_cortex_m3_disassemble_command, COMMAND_EXEC,
1790                         "disassemble Thumb2 instructions <address> <count>");
1791         register_command(cmd_ctx, cortex_m3_cmd, "maskisr",
1792                         handle_cortex_m3_mask_interrupts_command, COMMAND_EXEC,
1793                         "mask cortex_m3 interrupts ['on'|'off']");
1794         register_command(cmd_ctx, cortex_m3_cmd, "vector_catch",
1795                         handle_cortex_m3_vector_catch_command, COMMAND_EXEC,
1796                         "catch hardware vectors ['all'|'none'|<list>]");
1797
1798         return retval;
1799 }
1800
1801 int handle_cortex_m3_mask_interrupts_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1802 {
1803         target_t *target = get_current_target(cmd_ctx);
1804         armv7m_common_t *armv7m = target->arch_info;
1805         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1806
1807         if (target->state != TARGET_HALTED)
1808         {
1809                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
1810                 return ERROR_OK;
1811         }
1812
1813         if (argc > 0)
1814         {
1815                 if (!strcmp(args[0], "on"))
1816                 {
1817                         cortex_m3_write_debug_halt_mask(target, C_HALT | C_MASKINTS, 0);
1818                 }
1819                 else if (!strcmp(args[0], "off"))
1820                 {
1821                         cortex_m3_write_debug_halt_mask(target, C_HALT, C_MASKINTS);
1822                 }
1823                 else
1824                 {
1825                         command_print(cmd_ctx, "usage: cortex_m3 maskisr ['on'|'off']");
1826                 }
1827         }
1828
1829         command_print(cmd_ctx, "cortex_m3 interrupt mask %s",
1830                         (cortex_m3->dcb_dhcsr & C_MASKINTS) ? "on" : "off");
1831
1832         return ERROR_OK;
1833 }