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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  *   Copyright (C) 2009 by Dirk Behme                                      *
  12  *   dirk.behme@gmail.com - copy from cortex_m3                            *
  13  *                                                                         *
  14  *   Copyright (C) 2010 Øyvind Harboe                                      *
  15  *   oyvind.harboe@zylin.com                                               *
  16  *                                                                         *
  17  *   Copyright (C) ST-Ericsson SA 2011                                     *
  18  *   michel.jaouen@stericsson.com : smp minimum support                    *
  19  *                                                                         *
  20  *   Copyright (C) Broadcom 2012                                           *
  21  *   ehunter@broadcom.com : Cortex-R4 support                              *
  22  *                                                                         *
  23  *   Copyright (C) 2013 Kamal Dasu                                         *
  24  *   kdasu.kdev@gmail.com                                                  *
  25  *                                                                         *
  26  *   This program is free software; you can redistribute it and/or modify  *
  27  *   it under the terms of the GNU General Public License as published by  *
  28  *   the Free Software Foundation; either version 2 of the License, or     *
  29  *   (at your option) any later version.                                   *
  30  *                                                                         *
  31  *   This program is distributed in the hope that it will be useful,       *
  32  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  33  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  34  *   GNU General Public License for more details.                          *
  35  *                                                                         *
  36  *   You should have received a copy of the GNU General Public License     *
  37  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  38  *                                                                         *
  39  *   Cortex-A8(tm) TRM, ARM DDI 0344H                                      *
  40  *   Cortex-A9(tm) TRM, ARM DDI 0407F                                      *
  41  *   Cortex-A4(tm) TRM, ARM DDI 0363E                                      *
  42  *   Cortex-A15(tm)TRM, ARM DDI 0438C                                      *
  43  *                                                                         *
  44  ***************************************************************************/
  45
  46 #ifdef HAVE_CONFIG_H
  47 #include "config.h"
  48 #endif
  49
  50 #include "breakpoints.h"
  51 #include "cortex_a.h"
  52 #include "register.h"
  53 #include "armv7a_mmu.h"
  54 #include "target_request.h"
  55 #include "target_type.h"
  56 #include "arm_opcodes.h"
  57 #include "arm_semihosting.h"
  58 #include "jtag/interface.h"
  59 #include "transport/transport.h"
  60 #include "smp.h"
  61 #include <helper/time_support.h>
  62
  63 static int cortex_a_poll(struct target *target);
  64 static int cortex_a_debug_entry(struct target *target);
  65 static int cortex_a_restore_context(struct target *target, bool bpwp);
  66 static int cortex_a_set_breakpoint(struct target *target,
  67         struct breakpoint *breakpoint, uint8_t matchmode);
  68 static int cortex_a_set_context_breakpoint(struct target *target,
  69         struct breakpoint *breakpoint, uint8_t matchmode);
  70 static int cortex_a_set_hybrid_breakpoint(struct target *target,
  71         struct breakpoint *breakpoint);
  72 static int cortex_a_unset_breakpoint(struct target *target,
  73         struct breakpoint *breakpoint);
  74 static int cortex_a_wait_dscr_bits(struct target *target, uint32_t mask,
  75         uint32_t value, uint32_t *dscr);
  76 static int cortex_a_mmu(struct target *target, int *enabled);
  77 static int cortex_a_mmu_modify(struct target *target, int enable);
  78 static int cortex_a_virt2phys(struct target *target,
  79         target_addr_t virt, target_addr_t *phys);
  80 static int cortex_a_read_cpu_memory(struct target *target,
  81         uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
  82
  83
  84 /*  restore cp15_control_reg at resume */
  85 static int cortex_a_restore_cp15_control_reg(struct target *target)
  86 {
  87         int retval = ERROR_OK;
  88         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
  89         struct armv7a_common *armv7a = target_to_armv7a(target);
  90
  91         if (cortex_a->cp15_control_reg != cortex_a->cp15_control_reg_curr) {
  92                 cortex_a->cp15_control_reg_curr = cortex_a->cp15_control_reg;
  93                 /* LOG_INFO("cp15_control_reg: %8.8" PRIx32, cortex_a->cp15_control_reg); */
  94                 retval = armv7a->arm.mcr(target, 15,
  95                                 0, 0,   /* op1, op2 */
  96                                 1, 0,   /* CRn, CRm */
  97                                 cortex_a->cp15_control_reg);
  98         }
  99         return retval;
 100 }
 101
 102 /*
 103  * Set up ARM core for memory access.
 104  * If !phys_access, switch to SVC mode and make sure MMU is on
 105  * If phys_access, switch off mmu
 106  */
 107 static int cortex_a_prep_memaccess(struct target *target, int phys_access)
 108 {
 109         struct armv7a_common *armv7a = target_to_armv7a(target);
 110         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 111         int mmu_enabled = 0;
 112
 113         if (phys_access == 0) {
 114                 arm_dpm_modeswitch(&armv7a->dpm, ARM_MODE_SVC);
 115                 cortex_a_mmu(target, &mmu_enabled);
 116                 if (mmu_enabled)
 117                         cortex_a_mmu_modify(target, 1);
 118                 if (cortex_a->dacrfixup_mode == CORTEX_A_DACRFIXUP_ON) {
 119                         /* overwrite DACR to all-manager */
 120                         armv7a->arm.mcr(target, 15,
 121                                         0, 0, 3, 0,
 122                                         0xFFFFFFFF);
 123                 }
 124         } else {
 125                 cortex_a_mmu(target, &mmu_enabled);
 126                 if (mmu_enabled)
 127                         cortex_a_mmu_modify(target, 0);
 128         }
 129         return ERROR_OK;
 130 }
 131
 132 /*
 133  * Restore ARM core after memory access.
 134  * If !phys_access, switch to previous mode
 135  * If phys_access, restore MMU setting
 136  */
 137 static int cortex_a_post_memaccess(struct target *target, int phys_access)
 138 {
 139         struct armv7a_common *armv7a = target_to_armv7a(target);
 140         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 141
 142         if (phys_access == 0) {
 143                 if (cortex_a->dacrfixup_mode == CORTEX_A_DACRFIXUP_ON) {
 144                         /* restore */
 145                         armv7a->arm.mcr(target, 15,
 146                                         0, 0, 3, 0,
 147                                         cortex_a->cp15_dacr_reg);
 148                 }
 149                 arm_dpm_modeswitch(&armv7a->dpm, ARM_MODE_ANY);
 150         } else {
 151                 int mmu_enabled = 0;
 152                 cortex_a_mmu(target, &mmu_enabled);
 153                 if (mmu_enabled)
 154                         cortex_a_mmu_modify(target, 1);
 155         }
 156         return ERROR_OK;
 157 }
 158
 159
 160 /*  modify cp15_control_reg in order to enable or disable mmu for :
 161  *  - virt2phys address conversion
 162  *  - read or write memory in phys or virt address */
 163 static int cortex_a_mmu_modify(struct target *target, int enable)
 164 {
 165         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 166         struct armv7a_common *armv7a = target_to_armv7a(target);
 167         int retval = ERROR_OK;
 168         int need_write = 0;
 169
 170         if (enable) {
 171                 /*  if mmu enabled at target stop and mmu not enable */
 172                 if (!(cortex_a->cp15_control_reg & 0x1U)) {
 173                         LOG_ERROR("trying to enable mmu on target stopped with mmu disable");
 174                         return ERROR_FAIL;
 175                 }
 176                 if ((cortex_a->cp15_control_reg_curr & 0x1U) == 0) {
 177                         cortex_a->cp15_control_reg_curr |= 0x1U;
 178                         need_write = 1;
 179                 }
 180         } else {
 181                 if ((cortex_a->cp15_control_reg_curr & 0x1U) == 0x1U) {
 182                         cortex_a->cp15_control_reg_curr &= ~0x1U;
 183                         need_write = 1;
 184                 }
 185         }
 186
 187         if (need_write) {
 188                 LOG_DEBUG("%s, writing cp15 ctrl: %" PRIx32,
 189                         enable ? "enable mmu" : "disable mmu",
 190                         cortex_a->cp15_control_reg_curr);
 191
 192                 retval = armv7a->arm.mcr(target, 15,
 193                                 0, 0,   /* op1, op2 */
 194                                 1, 0,   /* CRn, CRm */
 195                                 cortex_a->cp15_control_reg_curr);
 196         }
 197         return retval;
 198 }
 199
 200 /*
 201  * Cortex-A Basic debug access, very low level assumes state is saved
 202  */
 203 static int cortex_a_init_debug_access(struct target *target)
 204 {
 205         struct armv7a_common *armv7a = target_to_armv7a(target);
 206         uint32_t dscr;
 207         int retval;
 208
 209         /* lock memory-mapped access to debug registers to prevent
 210          * software interference */
 211         retval = mem_ap_write_u32(armv7a->debug_ap,
 212                         armv7a->debug_base + CPUDBG_LOCKACCESS, 0);
 213         if (retval != ERROR_OK)
 214                 return retval;
 215
 216         /* Disable cacheline fills and force cache write-through in debug state */
 217         retval = mem_ap_write_u32(armv7a->debug_ap,
 218                         armv7a->debug_base + CPUDBG_DSCCR, 0);
 219         if (retval != ERROR_OK)
 220                 return retval;
 221
 222         /* Disable TLB lookup and refill/eviction in debug state */
 223         retval = mem_ap_write_u32(armv7a->debug_ap,
 224                         armv7a->debug_base + CPUDBG_DSMCR, 0);
 225         if (retval != ERROR_OK)
 226                 return retval;
 227
 228         retval = dap_run(armv7a->debug_ap->dap);
 229         if (retval != ERROR_OK)
 230                 return retval;
 231
 232         /* Enabling of instruction execution in debug mode is done in debug_entry code */
 233
 234         /* Resync breakpoint registers */
 235
 236         /* Enable halt for breakpoint, watchpoint and vector catch */
 237         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
 238                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 239         if (retval != ERROR_OK)
 240                 return retval;
 241         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
 242                         armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
 243         if (retval != ERROR_OK)
 244                 return retval;
 245
 246         /* Since this is likely called from init or reset, update target state information*/
 247         return cortex_a_poll(target);
 248 }
 249
 250 static int cortex_a_wait_instrcmpl(struct target *target, uint32_t *dscr, bool force)
 251 {
 252         /* Waits until InstrCmpl_l becomes 1, indicating instruction is done.
 253          * Writes final value of DSCR into *dscr. Pass force to force always
 254          * reading DSCR at least once. */
 255         struct armv7a_common *armv7a = target_to_armv7a(target);
 256         int retval;
 257
 258         if (force) {
 259                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
 260                                 armv7a->debug_base + CPUDBG_DSCR, dscr);
 261                 if (retval != ERROR_OK) {
 262                         LOG_ERROR("Could not read DSCR register");
 263                         return retval;
 264                 }
 265         }
 266
 267         retval = cortex_a_wait_dscr_bits(target, DSCR_INSTR_COMP, DSCR_INSTR_COMP, dscr);
 268         if (retval != ERROR_OK)
 269                 LOG_ERROR("Error waiting for InstrCompl=1");
 270         return retval;
 271 }
 272
 273 /* To reduce needless round-trips, pass in a pointer to the current
 274  * DSCR value.  Initialize it to zero if you just need to know the
 275  * value on return from this function; or DSCR_INSTR_COMP if you
 276  * happen to know that no instruction is pending.
 277  */
 278 static int cortex_a_exec_opcode(struct target *target,
 279         uint32_t opcode, uint32_t *dscr_p)
 280 {
 281         uint32_t dscr;
 282         int retval;
 283         struct armv7a_common *armv7a = target_to_armv7a(target);
 284
 285         dscr = dscr_p ? *dscr_p : 0;
 286
 287         LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
 288
 289         /* Wait for InstrCompl bit to be set */
 290         retval = cortex_a_wait_instrcmpl(target, dscr_p, false);
 291         if (retval != ERROR_OK)
 292                 return retval;
 293
 294         retval = mem_ap_write_u32(armv7a->debug_ap,
 295                         armv7a->debug_base + CPUDBG_ITR, opcode);
 296         if (retval != ERROR_OK)
 297                 return retval;
 298
 299         /* Wait for InstrCompl bit to be set */
 300         retval = cortex_a_wait_instrcmpl(target, &dscr, true);
 301         if (retval != ERROR_OK) {
 302                 LOG_ERROR("Error waiting for cortex_a_exec_opcode");
 303                 return retval;
 304         }
 305
 306         if (dscr_p)
 307                 *dscr_p = dscr;
 308
 309         return retval;
 310 }
 311
 312 /* Write to memory mapped registers directly with no cache or mmu handling */
 313 static int cortex_a_dap_write_memap_register_u32(struct target *target,
 314         uint32_t address,
 315         uint32_t value)
 316 {
 317         int retval;
 318         struct armv7a_common *armv7a = target_to_armv7a(target);
 319
 320         retval = mem_ap_write_atomic_u32(armv7a->debug_ap, address, value);
 321
 322         return retval;
 323 }
 324
 325 /*
 326  * Cortex-A implementation of Debug Programmer's Model
 327  *
 328  * NOTE the invariant:  these routines return with DSCR_INSTR_COMP set,
 329  * so there's no need to poll for it before executing an instruction.
 330  *
 331  * NOTE that in several of these cases the "stall" mode might be useful.
 332  * It'd let us queue a few operations together... prepare/finish might
 333  * be the places to enable/disable that mode.
 334  */
 335
 336 static inline struct cortex_a_common *dpm_to_a(struct arm_dpm *dpm)
 337 {
 338         return container_of(dpm, struct cortex_a_common, armv7a_common.dpm);
 339 }
 340
 341 static int cortex_a_write_dcc(struct cortex_a_common *a, uint32_t data)
 342 {
 343         LOG_DEBUG("write DCC 0x%08" PRIx32, data);
 344         return mem_ap_write_u32(a->armv7a_common.debug_ap,
 345                         a->armv7a_common.debug_base + CPUDBG_DTRRX, data);
 346 }
 347
 348 static int cortex_a_read_dcc(struct cortex_a_common *a, uint32_t *data,
 349         uint32_t *dscr_p)
 350 {
 351         uint32_t dscr = DSCR_INSTR_COMP;
 352         int retval;
 353
 354         if (dscr_p)
 355                 dscr = *dscr_p;
 356
 357         /* Wait for DTRRXfull */
 358         retval = cortex_a_wait_dscr_bits(a->armv7a_common.arm.target,
 359                         DSCR_DTR_TX_FULL, DSCR_DTR_TX_FULL, &dscr);
 360         if (retval != ERROR_OK) {
 361                 LOG_ERROR("Error waiting for read dcc");
 362                 return retval;
 363         }
 364
 365         retval = mem_ap_read_atomic_u32(a->armv7a_common.debug_ap,
 366                         a->armv7a_common.debug_base + CPUDBG_DTRTX, data);
 367         if (retval != ERROR_OK)
 368                 return retval;
 369         /* LOG_DEBUG("read DCC 0x%08" PRIx32, *data); */
 370
 371         if (dscr_p)
 372                 *dscr_p = dscr;
 373
 374         return retval;
 375 }
 376
 377 static int cortex_a_dpm_prepare(struct arm_dpm *dpm)
 378 {
 379         struct cortex_a_common *a = dpm_to_a(dpm);
 380         uint32_t dscr;
 381         int retval;
 382
 383         /* set up invariant:  INSTR_COMP is set after ever DPM operation */
 384         retval = cortex_a_wait_instrcmpl(dpm->arm->target, &dscr, true);
 385         if (retval != ERROR_OK) {
 386                 LOG_ERROR("Error waiting for dpm prepare");
 387                 return retval;
 388         }
 389
 390         /* this "should never happen" ... */
 391         if (dscr & DSCR_DTR_RX_FULL) {
 392                 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
 393                 /* Clear DCCRX */
 394                 retval = cortex_a_exec_opcode(
 395                                 a->armv7a_common.arm.target,
 396                                 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 397                                 &dscr);
 398                 if (retval != ERROR_OK)
 399                         return retval;
 400         }
 401
 402         return retval;
 403 }
 404
 405 static int cortex_a_dpm_finish(struct arm_dpm *dpm)
 406 {
 407         /* REVISIT what could be done here? */
 408         return ERROR_OK;
 409 }
 410
 411 static int cortex_a_instr_write_data_dcc(struct arm_dpm *dpm,
 412         uint32_t opcode, uint32_t data)
 413 {
 414         struct cortex_a_common *a = dpm_to_a(dpm);
 415         int retval;
 416         uint32_t dscr = DSCR_INSTR_COMP;
 417
 418         retval = cortex_a_write_dcc(a, data);
 419         if (retval != ERROR_OK)
 420                 return retval;
 421
 422         return cortex_a_exec_opcode(
 423                         a->armv7a_common.arm.target,
 424                         opcode,
 425                         &dscr);
 426 }
 427
 428 static int cortex_a_instr_write_data_r0(struct arm_dpm *dpm,
 429         uint32_t opcode, uint32_t data)
 430 {
 431         struct cortex_a_common *a = dpm_to_a(dpm);
 432         uint32_t dscr = DSCR_INSTR_COMP;
 433         int retval;
 434
 435         retval = cortex_a_write_dcc(a, data);
 436         if (retval != ERROR_OK)
 437                 return retval;
 438
 439         /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 */
 440         retval = cortex_a_exec_opcode(
 441                         a->armv7a_common.arm.target,
 442                         ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 443                         &dscr);
 444         if (retval != ERROR_OK)
 445                 return retval;
 446
 447         /* then the opcode, taking data from R0 */
 448         retval = cortex_a_exec_opcode(
 449                         a->armv7a_common.arm.target,
 450                         opcode,
 451                         &dscr);
 452
 453         return retval;
 454 }
 455
 456 static int cortex_a_instr_cpsr_sync(struct arm_dpm *dpm)
 457 {
 458         struct target *target = dpm->arm->target;
 459         uint32_t dscr = DSCR_INSTR_COMP;
 460
 461         /* "Prefetch flush" after modifying execution status in CPSR */
 462         return cortex_a_exec_opcode(target,
 463                         ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
 464                         &dscr);
 465 }
 466
 467 static int cortex_a_instr_read_data_dcc(struct arm_dpm *dpm,
 468         uint32_t opcode, uint32_t *data)
 469 {
 470         struct cortex_a_common *a = dpm_to_a(dpm);
 471         int retval;
 472         uint32_t dscr = DSCR_INSTR_COMP;
 473
 474         /* the opcode, writing data to DCC */
 475         retval = cortex_a_exec_opcode(
 476                         a->armv7a_common.arm.target,
 477                         opcode,
 478                         &dscr);
 479         if (retval != ERROR_OK)
 480                 return retval;
 481
 482         return cortex_a_read_dcc(a, data, &dscr);
 483 }
 484
 485
 486 static int cortex_a_instr_read_data_r0(struct arm_dpm *dpm,
 487         uint32_t opcode, uint32_t *data)
 488 {
 489         struct cortex_a_common *a = dpm_to_a(dpm);
 490         uint32_t dscr = DSCR_INSTR_COMP;
 491         int retval;
 492
 493         /* the opcode, writing data to R0 */
 494         retval = cortex_a_exec_opcode(
 495                         a->armv7a_common.arm.target,
 496                         opcode,
 497                         &dscr);
 498         if (retval != ERROR_OK)
 499                 return retval;
 500
 501         /* write R0 to DCC */
 502         retval = cortex_a_exec_opcode(
 503                         a->armv7a_common.arm.target,
 504                         ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
 505                         &dscr);
 506         if (retval != ERROR_OK)
 507                 return retval;
 508
 509         return cortex_a_read_dcc(a, data, &dscr);
 510 }
 511
 512 static int cortex_a_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
 513         uint32_t addr, uint32_t control)
 514 {
 515         struct cortex_a_common *a = dpm_to_a(dpm);
 516         uint32_t vr = a->armv7a_common.debug_base;
 517         uint32_t cr = a->armv7a_common.debug_base;
 518         int retval;
 519
 520         switch (index_t) {
 521                 case 0 ... 15:  /* breakpoints */
 522                         vr += CPUDBG_BVR_BASE;
 523                         cr += CPUDBG_BCR_BASE;
 524                         break;
 525                 case 16 ... 31: /* watchpoints */
 526                         vr += CPUDBG_WVR_BASE;
 527                         cr += CPUDBG_WCR_BASE;
 528                         index_t -= 16;
 529                         break;
 530                 default:
 531                         return ERROR_FAIL;
 532         }
 533         vr += 4 * index_t;
 534         cr += 4 * index_t;
 535
 536         LOG_DEBUG("A: bpwp enable, vr %08x cr %08x",
 537                 (unsigned) vr, (unsigned) cr);
 538
 539         retval = cortex_a_dap_write_memap_register_u32(dpm->arm->target,
 540                         vr, addr);
 541         if (retval != ERROR_OK)
 542                 return retval;
 543         retval = cortex_a_dap_write_memap_register_u32(dpm->arm->target,
 544                         cr, control);
 545         return retval;
 546 }
 547
 548 static int cortex_a_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
 549 {
 550         struct cortex_a_common *a = dpm_to_a(dpm);
 551         uint32_t cr;
 552
 553         switch (index_t) {
 554                 case 0 ... 15:
 555                         cr = a->armv7a_common.debug_base + CPUDBG_BCR_BASE;
 556                         break;
 557                 case 16 ... 31:
 558                         cr = a->armv7a_common.debug_base + CPUDBG_WCR_BASE;
 559                         index_t -= 16;
 560                         break;
 561                 default:
 562                         return ERROR_FAIL;
 563         }
 564         cr += 4 * index_t;
 565
 566         LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr);
 567
 568         /* clear control register */
 569         return cortex_a_dap_write_memap_register_u32(dpm->arm->target, cr, 0);
 570 }
 571
 572 static int cortex_a_dpm_setup(struct cortex_a_common *a, uint32_t didr)
 573 {
 574         struct arm_dpm *dpm = &a->armv7a_common.dpm;
 575         int retval;
 576
 577         dpm->arm = &a->armv7a_common.arm;
 578         dpm->didr = didr;
 579
 580         dpm->prepare = cortex_a_dpm_prepare;
 581         dpm->finish = cortex_a_dpm_finish;
 582
 583         dpm->instr_write_data_dcc = cortex_a_instr_write_data_dcc;
 584         dpm->instr_write_data_r0 = cortex_a_instr_write_data_r0;
 585         dpm->instr_cpsr_sync = cortex_a_instr_cpsr_sync;
 586
 587         dpm->instr_read_data_dcc = cortex_a_instr_read_data_dcc;
 588         dpm->instr_read_data_r0 = cortex_a_instr_read_data_r0;
 589
 590         dpm->bpwp_enable = cortex_a_bpwp_enable;
 591         dpm->bpwp_disable = cortex_a_bpwp_disable;
 592
 593         retval = arm_dpm_setup(dpm);
 594         if (retval == ERROR_OK)
 595                 retval = arm_dpm_initialize(dpm);
 596
 597         return retval;
 598 }
 599 static struct target *get_cortex_a(struct target *target, int32_t coreid)
 600 {
 601         struct target_list *head;
 602         struct target *curr;
 603
 604         head = target->head;
 605         while (head != (struct target_list *)NULL) {
 606                 curr = head->target;
 607                 if ((curr->coreid == coreid) && (curr->state == TARGET_HALTED))
 608                         return curr;
 609                 head = head->next;
 610         }
 611         return target;
 612 }
 613 static int cortex_a_halt(struct target *target);
 614
 615 static int cortex_a_halt_smp(struct target *target)
 616 {
 617         int retval = 0;
 618         struct target_list *head;
 619         struct target *curr;
 620         head = target->head;
 621         while (head != (struct target_list *)NULL) {
 622                 curr = head->target;
 623                 if ((curr != target) && (curr->state != TARGET_HALTED)
 624                         && target_was_examined(curr))
 625                         retval += cortex_a_halt(curr);
 626                 head = head->next;
 627         }
 628         return retval;
 629 }
 630
 631 static int update_halt_gdb(struct target *target)
 632 {
 633         struct target *gdb_target = NULL;
 634         struct target_list *head;
 635         struct target *curr;
 636         int retval = 0;
 637
 638         if (target->gdb_service && target->gdb_service->core[0] == -1) {
 639                 target->gdb_service->target = target;
 640                 target->gdb_service->core[0] = target->coreid;
 641                 retval += cortex_a_halt_smp(target);
 642         }
 643
 644         if (target->gdb_service)
 645                 gdb_target = target->gdb_service->target;
 646
 647         foreach_smp_target(head, target->head) {
 648                 curr = head->target;
 649                 /* skip calling context */
 650                 if (curr == target)
 651                         continue;
 652                 if (!target_was_examined(curr))
 653                         continue;
 654                 /* skip targets that were already halted */
 655                 if (curr->state == TARGET_HALTED)
 656                         continue;
 657                 /* Skip gdb_target; it alerts GDB so has to be polled as last one */
 658                 if (curr == gdb_target)
 659                         continue;
 660
 661                 /* avoid recursion in cortex_a_poll() */
 662                 curr->smp = 0;
 663                 cortex_a_poll(curr);
 664                 curr->smp = 1;
 665         }
 666
 667         /* after all targets were updated, poll the gdb serving target */
 668         if (gdb_target != NULL && gdb_target != target)
 669                 cortex_a_poll(gdb_target);
 670         return retval;
 671 }
 672
 673 /*
 674  * Cortex-A Run control
 675  */
 676
 677 static int cortex_a_poll(struct target *target)
 678 {
 679         int retval = ERROR_OK;
 680         uint32_t dscr;
 681         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 682         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
 683         enum target_state prev_target_state = target->state;
 684         /*  toggle to another core is done by gdb as follow */
 685         /*  maint packet J core_id */
 686         /*  continue */
 687         /*  the next polling trigger an halt event sent to gdb */
 688         if ((target->state == TARGET_HALTED) && (target->smp) &&
 689                 (target->gdb_service) &&
 690                 (target->gdb_service->target == NULL)) {
 691                 target->gdb_service->target =
 692                         get_cortex_a(target, target->gdb_service->core[1]);
 693                 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 694                 return retval;
 695         }
 696         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
 697                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 698         if (retval != ERROR_OK)
 699                 return retval;
 700         cortex_a->cpudbg_dscr = dscr;
 701
 702         if (DSCR_RUN_MODE(dscr) == (DSCR_CORE_HALTED | DSCR_CORE_RESTARTED)) {
 703                 if (prev_target_state != TARGET_HALTED) {
 704                         /* We have a halting debug event */
 705                         LOG_DEBUG("Target halted");
 706                         target->state = TARGET_HALTED;
 707
 708                         retval = cortex_a_debug_entry(target);
 709                         if (retval != ERROR_OK)
 710                                 return retval;
 711
 712                         if (target->smp) {
 713                                 retval = update_halt_gdb(target);
 714                                 if (retval != ERROR_OK)
 715                                         return retval;
 716                         }
 717
 718                         if (prev_target_state == TARGET_DEBUG_RUNNING) {
 719                                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 720                         } else { /* prev_target_state is RUNNING, UNKNOWN or RESET */
 721                                 if (arm_semihosting(target, &retval) != 0)
 722                                         return retval;
 723
 724                                 target_call_event_callbacks(target,
 725                                         TARGET_EVENT_HALTED);
 726                         }
 727                 }
 728         } else
 729                 target->state = TARGET_RUNNING;
 730
 731         return retval;
 732 }
 733
 734 static int cortex_a_halt(struct target *target)
 735 {
 736         int retval;
 737         uint32_t dscr;
 738         struct armv7a_common *armv7a = target_to_armv7a(target);
 739
 740         /*
 741          * Tell the core to be halted by writing DRCR with 0x1
 742          * and then wait for the core to be halted.
 743          */
 744         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
 745                         armv7a->debug_base + CPUDBG_DRCR, DRCR_HALT);
 746         if (retval != ERROR_OK)
 747                 return retval;
 748
 749         dscr = 0; /* force read of dscr */
 750         retval = cortex_a_wait_dscr_bits(target, DSCR_CORE_HALTED,
 751                         DSCR_CORE_HALTED, &dscr);
 752         if (retval != ERROR_OK) {
 753                 LOG_ERROR("Error waiting for halt");
 754                 return retval;
 755         }
 756
 757         target->debug_reason = DBG_REASON_DBGRQ;
 758
 759         return ERROR_OK;
 760 }
 761
 762 static int cortex_a_internal_restore(struct target *target, int current,
 763         target_addr_t *address, int handle_breakpoints, int debug_execution)
 764 {
 765         struct armv7a_common *armv7a = target_to_armv7a(target);
 766         struct arm *arm = &armv7a->arm;
 767         int retval;
 768         uint32_t resume_pc;
 769
 770         if (!debug_execution)
 771                 target_free_all_working_areas(target);
 772
 773 #if 0
 774         if (debug_execution) {
 775                 /* Disable interrupts */
 776                 /* We disable interrupts in the PRIMASK register instead of
 777                  * masking with C_MASKINTS,
 778                  * This is probably the same issue as Cortex-M3 Errata 377493:
 779                  * C_MASKINTS in parallel with disabled interrupts can cause
 780                  * local faults to not be taken. */
 781                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 782                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = true;
 783                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = true;
 784
 785                 /* Make sure we are in Thumb mode */
 786                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 787                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0,
 788                         32) | (1 << 24));
 789                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = true;
 790                 armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = true;
 791         }
 792 #endif
 793
 794         /* current = 1: continue on current pc, otherwise continue at <address> */
 795         resume_pc = buf_get_u32(arm->pc->value, 0, 32);
 796         if (!current)
 797                 resume_pc = *address;
 798         else
 799                 *address = resume_pc;
 800
 801         /* Make sure that the Armv7 gdb thumb fixups does not
 802          * kill the return address
 803          */
 804         switch (arm->core_state) {
 805                 case ARM_STATE_ARM:
 806                         resume_pc &= 0xFFFFFFFC;
 807                         break;
 808                 case ARM_STATE_THUMB:
 809                 case ARM_STATE_THUMB_EE:
 810                         /* When the return address is loaded into PC
 811                          * bit 0 must be 1 to stay in Thumb state
 812                          */
 813                         resume_pc |= 0x1;
 814                         break;
 815                 case ARM_STATE_JAZELLE:
 816                         LOG_ERROR("How do I resume into Jazelle state??");
 817                         return ERROR_FAIL;
 818                 case ARM_STATE_AARCH64:
 819                         LOG_ERROR("Shoudn't be in AARCH64 state");
 820                         return ERROR_FAIL;
 821         }
 822         LOG_DEBUG("resume pc = 0x%08" PRIx32, resume_pc);
 823         buf_set_u32(arm->pc->value, 0, 32, resume_pc);
 824         arm->pc->dirty = true;
 825         arm->pc->valid = true;
 826
 827         /* restore dpm_mode at system halt */
 828         arm_dpm_modeswitch(&armv7a->dpm, ARM_MODE_ANY);
 829         /* called it now before restoring context because it uses cpu
 830          * register r0 for restoring cp15 control register */
 831         retval = cortex_a_restore_cp15_control_reg(target);
 832         if (retval != ERROR_OK)
 833                 return retval;
 834         retval = cortex_a_restore_context(target, handle_breakpoints);
 835         if (retval != ERROR_OK)
 836                 return retval;
 837         target->debug_reason = DBG_REASON_NOTHALTED;
 838         target->state = TARGET_RUNNING;
 839
 840         /* registers are now invalid */
 841         register_cache_invalidate(arm->core_cache);
 842
 843 #if 0
 844         /* the front-end may request us not to handle breakpoints */
 845         if (handle_breakpoints) {
 846                 /* Single step past breakpoint at current address */
 847                 breakpoint = breakpoint_find(target, resume_pc);
 848                 if (breakpoint) {
 849                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 850                         cortex_m3_unset_breakpoint(target, breakpoint);
 851                         cortex_m3_single_step_core(target);
 852                         cortex_m3_set_breakpoint(target, breakpoint);
 853                 }
 854         }
 855
 856 #endif
 857         return retval;
 858 }
 859
 860 static int cortex_a_internal_restart(struct target *target)
 861 {
 862         struct armv7a_common *armv7a = target_to_armv7a(target);
 863         struct arm *arm = &armv7a->arm;
 864         int retval;
 865         uint32_t dscr;
 866         /*
 867          * * Restart core and wait for it to be started.  Clear ITRen and sticky
 868          * * exception flags: see ARMv7 ARM, C5.9.
 869          *
 870          * REVISIT: for single stepping, we probably want to
 871          * disable IRQs by default, with optional override...
 872          */
 873
 874         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
 875                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 876         if (retval != ERROR_OK)
 877                 return retval;
 878
 879         if ((dscr & DSCR_INSTR_COMP) == 0)
 880                 LOG_ERROR("DSCR InstrCompl must be set before leaving debug!");
 881
 882         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
 883                         armv7a->debug_base + CPUDBG_DSCR, dscr & ~DSCR_ITR_EN);
 884         if (retval != ERROR_OK)
 885                 return retval;
 886
 887         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
 888                         armv7a->debug_base + CPUDBG_DRCR, DRCR_RESTART |
 889                         DRCR_CLEAR_EXCEPTIONS);
 890         if (retval != ERROR_OK)
 891                 return retval;
 892
 893         dscr = 0; /* force read of dscr */
 894         retval = cortex_a_wait_dscr_bits(target, DSCR_CORE_RESTARTED,
 895                         DSCR_CORE_RESTARTED, &dscr);
 896         if (retval != ERROR_OK) {
 897                 LOG_ERROR("Error waiting for resume");
 898                 return retval;
 899         }
 900
 901         target->debug_reason = DBG_REASON_NOTHALTED;
 902         target->state = TARGET_RUNNING;
 903
 904         /* registers are now invalid */
 905         register_cache_invalidate(arm->core_cache);
 906
 907         return ERROR_OK;
 908 }
 909
 910 static int cortex_a_restore_smp(struct target *target, int handle_breakpoints)
 911 {
 912         int retval = 0;
 913         struct target_list *head;
 914         struct target *curr;
 915         target_addr_t address;
 916         head = target->head;
 917         while (head != (struct target_list *)NULL) {
 918                 curr = head->target;
 919                 if ((curr != target) && (curr->state != TARGET_RUNNING)
 920                         && target_was_examined(curr)) {
 921                         /*  resume current address , not in step mode */
 922                         retval += cortex_a_internal_restore(curr, 1, &address,
 923                                         handle_breakpoints, 0);
 924                         retval += cortex_a_internal_restart(curr);
 925                 }
 926                 head = head->next;
 927
 928         }
 929         return retval;
 930 }
 931
 932 static int cortex_a_resume(struct target *target, int current,
 933         target_addr_t address, int handle_breakpoints, int debug_execution)
 934 {
 935         int retval = 0;
 936         /* dummy resume for smp toggle in order to reduce gdb impact  */
 937         if ((target->smp) && (target->gdb_service->core[1] != -1)) {
 938                 /*   simulate a start and halt of target */
 939                 target->gdb_service->target = NULL;
 940                 target->gdb_service->core[0] = target->gdb_service->core[1];
 941                 /*  fake resume at next poll we play the  target core[1], see poll*/
 942                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 943                 return 0;
 944         }
 945         cortex_a_internal_restore(target, current, &address, handle_breakpoints, debug_execution);
 946         if (target->smp) {
 947                 target->gdb_service->core[0] = -1;
 948                 retval = cortex_a_restore_smp(target, handle_breakpoints);
 949                 if (retval != ERROR_OK)
 950                         return retval;
 951         }
 952         cortex_a_internal_restart(target);
 953
 954         if (!debug_execution) {
 955                 target->state = TARGET_RUNNING;
 956                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 957                 LOG_DEBUG("target resumed at " TARGET_ADDR_FMT, address);
 958         } else {
 959                 target->state = TARGET_DEBUG_RUNNING;
 960                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 961                 LOG_DEBUG("target debug resumed at " TARGET_ADDR_FMT, address);
 962         }
 963
 964         return ERROR_OK;
 965 }
 966
 967 static int cortex_a_debug_entry(struct target *target)
 968 {
 969         uint32_t dscr;
 970         int retval = ERROR_OK;
 971         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 972         struct armv7a_common *armv7a = target_to_armv7a(target);
 973         struct arm *arm = &armv7a->arm;
 974
 975         LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a->cpudbg_dscr);
 976
 977         /* REVISIT surely we should not re-read DSCR !! */
 978         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
 979                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 980         if (retval != ERROR_OK)
 981                 return retval;
 982
 983         /* REVISIT see A TRM 12.11.4 steps 2..3 -- make sure that any
 984          * imprecise data aborts get discarded by issuing a Data
 985          * Synchronization Barrier:  ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
 986          */
 987
 988         /* Enable the ITR execution once we are in debug mode */
 989         dscr |= DSCR_ITR_EN;
 990         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
 991                         armv7a->debug_base + CPUDBG_DSCR, dscr);
 992         if (retval != ERROR_OK)
 993                 return retval;
 994
 995         /* Examine debug reason */
 996         arm_dpm_report_dscr(&armv7a->dpm, cortex_a->cpudbg_dscr);
 997
 998         /* save address of instruction that triggered the watchpoint? */
 999         if (target->debug_reason == DBG_REASON_WATCHPOINT) {
1000                 uint32_t wfar;
1001
1002                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
1003                                 armv7a->debug_base + CPUDBG_WFAR,
1004                                 &wfar);
1005                 if (retval != ERROR_OK)
1006                         return retval;
1007                 arm_dpm_report_wfar(&armv7a->dpm, wfar);
1008         }
1009
1010         /* First load register accessible through core debug port */
1011         retval = arm_dpm_read_current_registers(&armv7a->dpm);
1012         if (retval != ERROR_OK)
1013                 return retval;
1014
1015         if (arm->spsr) {
1016                 /* read SPSR */
1017                 retval = arm_dpm_read_reg(&armv7a->dpm, arm->spsr, 17);
1018                 if (retval != ERROR_OK)
1019                         return retval;
1020         }
1021
1022 #if 0
1023 /* TODO, Move this */
1024         uint32_t cp15_control_register, cp15_cacr, cp15_nacr;
1025         cortex_a_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
1026         LOG_DEBUG("cp15_control_register = 0x%08x", cp15_control_register);
1027
1028         cortex_a_read_cp(target, &cp15_cacr, 15, 0, 1, 0, 2);
1029         LOG_DEBUG("cp15 Coprocessor Access Control Register = 0x%08x", cp15_cacr);
1030
1031         cortex_a_read_cp(target, &cp15_nacr, 15, 0, 1, 1, 2);
1032         LOG_DEBUG("cp15 Nonsecure Access Control Register = 0x%08x", cp15_nacr);
1033 #endif
1034
1035         /* Are we in an exception handler */
1036 /*      armv4_5->exception_number = 0; */
1037         if (armv7a->post_debug_entry) {
1038                 retval = armv7a->post_debug_entry(target);
1039                 if (retval != ERROR_OK)
1040                         return retval;
1041         }
1042
1043         return retval;
1044 }
1045
1046 static int cortex_a_post_debug_entry(struct target *target)
1047 {
1048         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1049         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
1050         int retval;
1051
1052         /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1053         retval = armv7a->arm.mrc(target, 15,
1054                         0, 0,   /* op1, op2 */
1055                         1, 0,   /* CRn, CRm */
1056                         &cortex_a->cp15_control_reg);
1057         if (retval != ERROR_OK)
1058                 return retval;
1059         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a->cp15_control_reg);
1060         cortex_a->cp15_control_reg_curr = cortex_a->cp15_control_reg;
1061
1062         if (!armv7a->is_armv7r)
1063                 armv7a_read_ttbcr(target);
1064
1065         if (armv7a->armv7a_mmu.armv7a_cache.info == -1)
1066                 armv7a_identify_cache(target);
1067
1068         if (armv7a->is_armv7r) {
1069                 armv7a->armv7a_mmu.mmu_enabled = 0;
1070         } else {
1071                 armv7a->armv7a_mmu.mmu_enabled =
1072                         (cortex_a->cp15_control_reg & 0x1U) ? 1 : 0;
1073         }
1074         armv7a->armv7a_mmu.armv7a_cache.d_u_cache_enabled =
1075                 (cortex_a->cp15_control_reg & 0x4U) ? 1 : 0;
1076         armv7a->armv7a_mmu.armv7a_cache.i_cache_enabled =
1077                 (cortex_a->cp15_control_reg & 0x1000U) ? 1 : 0;
1078         cortex_a->curr_mode = armv7a->arm.core_mode;
1079
1080         /* switch to SVC mode to read DACR */
1081         arm_dpm_modeswitch(&armv7a->dpm, ARM_MODE_SVC);
1082         armv7a->arm.mrc(target, 15,
1083                         0, 0, 3, 0,
1084                         &cortex_a->cp15_dacr_reg);
1085
1086         LOG_DEBUG("cp15_dacr_reg: %8.8" PRIx32,
1087                         cortex_a->cp15_dacr_reg);
1088
1089         arm_dpm_modeswitch(&armv7a->dpm, ARM_MODE_ANY);
1090         return ERROR_OK;
1091 }
1092
1093 int cortex_a_set_dscr_bits(struct target *target, unsigned long bit_mask, unsigned long value)
1094 {
1095         struct armv7a_common *armv7a = target_to_armv7a(target);
1096         uint32_t dscr;
1097
1098         /* Read DSCR */
1099         int retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
1100                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
1101         if (ERROR_OK != retval)
1102                 return retval;
1103
1104         /* clear bitfield */
1105         dscr &= ~bit_mask;
1106         /* put new value */
1107         dscr |= value & bit_mask;
1108
1109         /* write new DSCR */
1110         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
1111                         armv7a->debug_base + CPUDBG_DSCR, dscr);
1112         return retval;
1113 }
1114
1115 static int cortex_a_step(struct target *target, int current, target_addr_t address,
1116         int handle_breakpoints)
1117 {
1118         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1119         struct armv7a_common *armv7a = target_to_armv7a(target);
1120         struct arm *arm = &armv7a->arm;
1121         struct breakpoint *breakpoint = NULL;
1122         struct breakpoint stepbreakpoint;
1123         struct reg *r;
1124         int retval;
1125
1126         if (target->state != TARGET_HALTED) {
1127                 LOG_WARNING("target not halted");
1128                 return ERROR_TARGET_NOT_HALTED;
1129         }
1130
1131         /* current = 1: continue on current pc, otherwise continue at <address> */
1132         r = arm->pc;
1133         if (!current)
1134                 buf_set_u32(r->value, 0, 32, address);
1135         else
1136                 address = buf_get_u32(r->value, 0, 32);
1137
1138         /* The front-end may request us not to handle breakpoints.
1139          * But since Cortex-A uses breakpoint for single step,
1140          * we MUST handle breakpoints.
1141          */
1142         handle_breakpoints = 1;
1143         if (handle_breakpoints) {
1144                 breakpoint = breakpoint_find(target, address);
1145                 if (breakpoint)
1146                         cortex_a_unset_breakpoint(target, breakpoint);
1147         }
1148
1149         /* Setup single step breakpoint */
1150         stepbreakpoint.address = address;
1151         stepbreakpoint.asid = 0;
1152         stepbreakpoint.length = (arm->core_state == ARM_STATE_THUMB)
1153                 ? 2 : 4;
1154         stepbreakpoint.type = BKPT_HARD;
1155         stepbreakpoint.set = 0;
1156
1157         /* Disable interrupts during single step if requested */
1158         if (cortex_a->isrmasking_mode == CORTEX_A_ISRMASK_ON) {
1159                 retval = cortex_a_set_dscr_bits(target, DSCR_INT_DIS, DSCR_INT_DIS);
1160                 if (ERROR_OK != retval)
1161                         return retval;
1162         }
1163
1164         /* Break on IVA mismatch */
1165         cortex_a_set_breakpoint(target, &stepbreakpoint, 0x04);
1166
1167         target->debug_reason = DBG_REASON_SINGLESTEP;
1168
1169         retval = cortex_a_resume(target, 1, address, 0, 0);
1170         if (retval != ERROR_OK)
1171                 return retval;
1172
1173         int64_t then = timeval_ms();
1174         while (target->state != TARGET_HALTED) {
1175                 retval = cortex_a_poll(target);
1176                 if (retval != ERROR_OK)
1177                         return retval;
1178                 if (target->state == TARGET_HALTED)
1179                         break;
1180                 if (timeval_ms() > then + 1000) {
1181                         LOG_ERROR("timeout waiting for target halt");
1182                         return ERROR_FAIL;
1183                 }
1184         }
1185
1186         cortex_a_unset_breakpoint(target, &stepbreakpoint);
1187
1188         /* Re-enable interrupts if they were disabled */
1189         if (cortex_a->isrmasking_mode == CORTEX_A_ISRMASK_ON) {
1190                 retval = cortex_a_set_dscr_bits(target, DSCR_INT_DIS, 0);
1191                 if (ERROR_OK != retval)
1192                         return retval;
1193         }
1194
1195
1196         target->debug_reason = DBG_REASON_BREAKPOINT;
1197
1198         if (breakpoint)
1199                 cortex_a_set_breakpoint(target, breakpoint, 0);
1200
1201         if (target->state != TARGET_HALTED)
1202                 LOG_DEBUG("target stepped");
1203
1204         return ERROR_OK;
1205 }
1206
1207 static int cortex_a_restore_context(struct target *target, bool bpwp)
1208 {
1209         struct armv7a_common *armv7a = target_to_armv7a(target);
1210
1211         LOG_DEBUG(" ");
1212
1213         if (armv7a->pre_restore_context)
1214                 armv7a->pre_restore_context(target);
1215
1216         return arm_dpm_write_dirty_registers(&armv7a->dpm, bpwp);
1217 }
1218
1219 /*
1220  * Cortex-A Breakpoint and watchpoint functions
1221  */
1222
1223 /* Setup hardware Breakpoint Register Pair */
1224 static int cortex_a_set_breakpoint(struct target *target,
1225         struct breakpoint *breakpoint, uint8_t matchmode)
1226 {
1227         int retval;
1228         int brp_i = 0;
1229         uint32_t control;
1230         uint8_t byte_addr_select = 0x0F;
1231         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1232         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
1233         struct cortex_a_brp *brp_list = cortex_a->brp_list;
1234
1235         if (breakpoint->set) {
1236                 LOG_WARNING("breakpoint already set");
1237                 return ERROR_OK;
1238         }
1239
1240         if (breakpoint->type == BKPT_HARD) {
1241                 while (brp_list[brp_i].used && (brp_i < cortex_a->brp_num))
1242                         brp_i++;
1243                 if (brp_i >= cortex_a->brp_num) {
1244                         LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1245                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1246                 }
1247                 breakpoint->set = brp_i + 1;
1248                 if (breakpoint->length == 2)
1249                         byte_addr_select = (3 << (breakpoint->address & 0x02));
1250                 control = ((matchmode & 0x7) << 20)
1251                         | (byte_addr_select << 5)
1252                         | (3 << 1) | 1;
1253                 brp_list[brp_i].used = 1;
1254                 brp_list[brp_i].value = (breakpoint->address & 0xFFFFFFFC);
1255                 brp_list[brp_i].control = control;
1256                 retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1257                                 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1258                                 brp_list[brp_i].value);
1259                 if (retval != ERROR_OK)
1260                         return retval;
1261                 retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1262                                 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1263                                 brp_list[brp_i].control);
1264                 if (retval != ERROR_OK)
1265                         return retval;
1266                 LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1267                         brp_list[brp_i].control,
1268                         brp_list[brp_i].value);
1269         } else if (breakpoint->type == BKPT_SOFT) {
1270                 uint8_t code[4];
1271                 /* length == 2: Thumb breakpoint */
1272                 if (breakpoint->length == 2)
1273                         buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1274                 else
1275                 /* length == 3: Thumb-2 breakpoint, actual encoding is
1276                  * a regular Thumb BKPT instruction but we replace a
1277                  * 32bit Thumb-2 instruction, so fix-up the breakpoint
1278                  * length
1279                  */
1280                 if (breakpoint->length == 3) {
1281                         buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1282                         breakpoint->length = 4;
1283                 } else
1284                         /* length == 4, normal ARM breakpoint */
1285                         buf_set_u32(code, 0, 32, ARMV5_BKPT(0x11));
1286
1287                 retval = target_read_memory(target,
1288                                 breakpoint->address & 0xFFFFFFFE,
1289                                 breakpoint->length, 1,
1290                                 breakpoint->orig_instr);
1291                 if (retval != ERROR_OK)
1292                         return retval;
1293
1294                 /* make sure data cache is cleaned & invalidated down to PoC */
1295                 if (!armv7a->armv7a_mmu.armv7a_cache.auto_cache_enabled) {
1296                         armv7a_cache_flush_virt(target, breakpoint->address,
1297                                                 breakpoint->length);
1298                 }
1299
1300                 retval = target_write_memory(target,
1301                                 breakpoint->address & 0xFFFFFFFE,
1302                                 breakpoint->length, 1, code);
1303                 if (retval != ERROR_OK)
1304                         return retval;
1305
1306                 /* update i-cache at breakpoint location */
1307                 armv7a_l1_d_cache_inval_virt(target, breakpoint->address,
1308                                         breakpoint->length);
1309                 armv7a_l1_i_cache_inval_virt(target, breakpoint->address,
1310                                                  breakpoint->length);
1311
1312                 breakpoint->set = 0x11; /* Any nice value but 0 */
1313         }
1314
1315         return ERROR_OK;
1316 }
1317
1318 static int cortex_a_set_context_breakpoint(struct target *target,
1319         struct breakpoint *breakpoint, uint8_t matchmode)
1320 {
1321         int retval = ERROR_FAIL;
1322         int brp_i = 0;
1323         uint32_t control;
1324         uint8_t byte_addr_select = 0x0F;
1325         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1326         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
1327         struct cortex_a_brp *brp_list = cortex_a->brp_list;
1328
1329         if (breakpoint->set) {
1330                 LOG_WARNING("breakpoint already set");
1331                 return retval;
1332         }
1333         /*check available context BRPs*/
1334         while ((brp_list[brp_i].used ||
1335                 (brp_list[brp_i].type != BRP_CONTEXT)) && (brp_i < cortex_a->brp_num))
1336                 brp_i++;
1337
1338         if (brp_i >= cortex_a->brp_num) {
1339                 LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1340                 return ERROR_FAIL;
1341         }
1342
1343         breakpoint->set = brp_i + 1;
1344         control = ((matchmode & 0x7) << 20)
1345                 | (byte_addr_select << 5)
1346                 | (3 << 1) | 1;
1347         brp_list[brp_i].used = 1;
1348         brp_list[brp_i].value = (breakpoint->asid);
1349         brp_list[brp_i].control = control;
1350         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1351                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1352                         brp_list[brp_i].value);
1353         if (retval != ERROR_OK)
1354                 return retval;
1355         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1356                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1357                         brp_list[brp_i].control);
1358         if (retval != ERROR_OK)
1359                 return retval;
1360         LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1361                 brp_list[brp_i].control,
1362                 brp_list[brp_i].value);
1363         return ERROR_OK;
1364
1365 }
1366
1367 static int cortex_a_set_hybrid_breakpoint(struct target *target, struct breakpoint *breakpoint)
1368 {
1369         int retval = ERROR_FAIL;
1370         int brp_1 = 0;  /* holds the contextID pair */
1371         int brp_2 = 0;  /* holds the IVA pair */
1372         uint32_t control_CTX, control_IVA;
1373         uint8_t CTX_byte_addr_select = 0x0F;
1374         uint8_t IVA_byte_addr_select = 0x0F;
1375         uint8_t CTX_machmode = 0x03;
1376         uint8_t IVA_machmode = 0x01;
1377         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1378         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
1379         struct cortex_a_brp *brp_list = cortex_a->brp_list;
1380
1381         if (breakpoint->set) {
1382                 LOG_WARNING("breakpoint already set");
1383                 return retval;
1384         }
1385         /*check available context BRPs*/
1386         while ((brp_list[brp_1].used ||
1387                 (brp_list[brp_1].type != BRP_CONTEXT)) && (brp_1 < cortex_a->brp_num))
1388                 brp_1++;
1389
1390         printf("brp(CTX) found num: %d\n", brp_1);
1391         if (brp_1 >= cortex_a->brp_num) {
1392                 LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1393                 return ERROR_FAIL;
1394         }
1395
1396         while ((brp_list[brp_2].used ||
1397                 (brp_list[brp_2].type != BRP_NORMAL)) && (brp_2 < cortex_a->brp_num))
1398                 brp_2++;
1399
1400         printf("brp(IVA) found num: %d\n", brp_2);
1401         if (brp_2 >= cortex_a->brp_num) {
1402                 LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1403                 return ERROR_FAIL;
1404         }
1405
1406         breakpoint->set = brp_1 + 1;
1407         breakpoint->linked_BRP = brp_2;
1408         control_CTX = ((CTX_machmode & 0x7) << 20)
1409                 | (brp_2 << 16)
1410                 | (0 << 14)
1411                 | (CTX_byte_addr_select << 5)
1412                 | (3 << 1) | 1;
1413         brp_list[brp_1].used = 1;
1414         brp_list[brp_1].value = (breakpoint->asid);
1415         brp_list[brp_1].control = control_CTX;
1416         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1417                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_1].BRPn,
1418                         brp_list[brp_1].value);
1419         if (retval != ERROR_OK)
1420                 return retval;
1421         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1422                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_1].BRPn,
1423                         brp_list[brp_1].control);
1424         if (retval != ERROR_OK)
1425                 return retval;
1426
1427         control_IVA = ((IVA_machmode & 0x7) << 20)
1428                 | (brp_1 << 16)
1429                 | (IVA_byte_addr_select << 5)
1430                 | (3 << 1) | 1;
1431         brp_list[brp_2].used = 1;
1432         brp_list[brp_2].value = (breakpoint->address & 0xFFFFFFFC);
1433         brp_list[brp_2].control = control_IVA;
1434         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1435                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_2].BRPn,
1436                         brp_list[brp_2].value);
1437         if (retval != ERROR_OK)
1438                 return retval;
1439         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1440                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_2].BRPn,
1441                         brp_list[brp_2].control);
1442         if (retval != ERROR_OK)
1443                 return retval;
1444
1445         return ERROR_OK;
1446 }
1447
1448 static int cortex_a_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1449 {
1450         int retval;
1451         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1452         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
1453         struct cortex_a_brp *brp_list = cortex_a->brp_list;
1454
1455         if (!breakpoint->set) {
1456                 LOG_WARNING("breakpoint not set");
1457                 return ERROR_OK;
1458         }
1459
1460         if (breakpoint->type == BKPT_HARD) {
1461                 if ((breakpoint->address != 0) && (breakpoint->asid != 0)) {
1462                         int brp_i = breakpoint->set - 1;
1463                         int brp_j = breakpoint->linked_BRP;
1464                         if ((brp_i < 0) || (brp_i >= cortex_a->brp_num)) {
1465                                 LOG_DEBUG("Invalid BRP number in breakpoint");
1466                                 return ERROR_OK;
1467                         }
1468                         LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1469                                 brp_list[brp_i].control, brp_list[brp_i].value);
1470                         brp_list[brp_i].used = 0;
1471                         brp_list[brp_i].value = 0;
1472                         brp_list[brp_i].control = 0;
1473                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1474                                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1475                                         brp_list[brp_i].control);
1476                         if (retval != ERROR_OK)
1477                                 return retval;
1478                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1479                                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1480                                         brp_list[brp_i].value);
1481                         if (retval != ERROR_OK)
1482                                 return retval;
1483                         if ((brp_j < 0) || (brp_j >= cortex_a->brp_num)) {
1484                                 LOG_DEBUG("Invalid BRP number in breakpoint");
1485                                 return ERROR_OK;
1486                         }
1487                         LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_j,
1488                                 brp_list[brp_j].control, brp_list[brp_j].value);
1489                         brp_list[brp_j].used = 0;
1490                         brp_list[brp_j].value = 0;
1491                         brp_list[brp_j].control = 0;
1492                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1493                                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_j].BRPn,
1494                                         brp_list[brp_j].control);
1495                         if (retval != ERROR_OK)
1496                                 return retval;
1497                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1498                                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_j].BRPn,
1499                                         brp_list[brp_j].value);
1500                         if (retval != ERROR_OK)
1501                                 return retval;
1502                         breakpoint->linked_BRP = 0;
1503                         breakpoint->set = 0;
1504                         return ERROR_OK;
1505
1506                 } else {
1507                         int brp_i = breakpoint->set - 1;
1508                         if ((brp_i < 0) || (brp_i >= cortex_a->brp_num)) {
1509                                 LOG_DEBUG("Invalid BRP number in breakpoint");
1510                                 return ERROR_OK;
1511                         }
1512                         LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1513                                 brp_list[brp_i].control, brp_list[brp_i].value);
1514                         brp_list[brp_i].used = 0;
1515                         brp_list[brp_i].value = 0;
1516                         brp_list[brp_i].control = 0;
1517                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1518                                         + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1519                                         brp_list[brp_i].control);
1520                         if (retval != ERROR_OK)
1521                                 return retval;
1522                         retval = cortex_a_dap_write_memap_register_u32(target, armv7a->debug_base
1523                                         + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1524                                         brp_list[brp_i].value);
1525                         if (retval != ERROR_OK)
1526                                 return retval;
1527                         breakpoint->set = 0;
1528                         return ERROR_OK;
1529                 }
1530         } else {
1531
1532                 /* make sure data cache is cleaned & invalidated down to PoC */
1533                 if (!armv7a->armv7a_mmu.armv7a_cache.auto_cache_enabled) {
1534                         armv7a_cache_flush_virt(target, breakpoint->address,
1535                                                 breakpoint->length);
1536                 }
1537
1538                 /* restore original instruction (kept in target endianness) */
1539                 if (breakpoint->length == 4) {
1540                         retval = target_write_memory(target,
1541                                         breakpoint->address & 0xFFFFFFFE,
1542                                         4, 1, breakpoint->orig_instr);
1543                         if (retval != ERROR_OK)
1544                                 return retval;
1545                 } else {
1546                         retval = target_write_memory(target,
1547                                         breakpoint->address & 0xFFFFFFFE,
1548                                         2, 1, breakpoint->orig_instr);
1549                         if (retval != ERROR_OK)
1550                                 return retval;
1551                 }
1552
1553                 /* update i-cache at breakpoint location */
1554                 armv7a_l1_d_cache_inval_virt(target, breakpoint->address,
1555                                                  breakpoint->length);
1556                 armv7a_l1_i_cache_inval_virt(target, breakpoint->address,
1557                                                  breakpoint->length);
1558         }
1559         breakpoint->set = 0;
1560
1561         return ERROR_OK;
1562 }
1563
1564 static int cortex_a_add_breakpoint(struct target *target,
1565         struct breakpoint *breakpoint)
1566 {
1567         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1568
1569         if ((breakpoint->type == BKPT_HARD) && (cortex_a->brp_num_available < 1)) {
1570                 LOG_INFO("no hardware breakpoint available");
1571                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1572         }
1573
1574         if (breakpoint->type == BKPT_HARD)
1575                 cortex_a->brp_num_available--;
1576
1577         return cortex_a_set_breakpoint(target, breakpoint, 0x00);       /* Exact match */
1578 }
1579
1580 static int cortex_a_add_context_breakpoint(struct target *target,
1581         struct breakpoint *breakpoint)
1582 {
1583         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1584
1585         if ((breakpoint->type == BKPT_HARD) && (cortex_a->brp_num_available < 1)) {
1586                 LOG_INFO("no hardware breakpoint available");
1587                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1588         }
1589
1590         if (breakpoint->type == BKPT_HARD)
1591                 cortex_a->brp_num_available--;
1592
1593         return cortex_a_set_context_breakpoint(target, breakpoint, 0x02);       /* asid match */
1594 }
1595
1596 static int cortex_a_add_hybrid_breakpoint(struct target *target,
1597         struct breakpoint *breakpoint)
1598 {
1599         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1600
1601         if ((breakpoint->type == BKPT_HARD) && (cortex_a->brp_num_available < 1)) {
1602                 LOG_INFO("no hardware breakpoint available");
1603                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1604         }
1605
1606         if (breakpoint->type == BKPT_HARD)
1607                 cortex_a->brp_num_available--;
1608
1609         return cortex_a_set_hybrid_breakpoint(target, breakpoint);      /* ??? */
1610 }
1611
1612
1613 static int cortex_a_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1614 {
1615         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
1616
1617 #if 0
1618 /* It is perfectly possible to remove breakpoints while the target is running */
1619         if (target->state != TARGET_HALTED) {
1620                 LOG_WARNING("target not halted");
1621                 return ERROR_TARGET_NOT_HALTED;
1622         }
1623 #endif
1624
1625         if (breakpoint->set) {
1626                 cortex_a_unset_breakpoint(target, breakpoint);
1627                 if (breakpoint->type == BKPT_HARD)
1628                         cortex_a->brp_num_available++;
1629         }
1630
1631
1632         return ERROR_OK;
1633 }
1634
1635 /*
1636  * Cortex-A Reset functions
1637  */
1638
1639 static int cortex_a_assert_reset(struct target *target)
1640 {
1641         struct armv7a_common *armv7a = target_to_armv7a(target);
1642
1643         LOG_DEBUG(" ");
1644
1645         /* FIXME when halt is requested, make it work somehow... */
1646
1647         /* This function can be called in "target not examined" state */
1648
1649         /* Issue some kind of warm reset. */
1650         if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT))
1651                 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
1652         else if (jtag_get_reset_config() & RESET_HAS_SRST) {
1653                 /* REVISIT handle "pulls" cases, if there's
1654                  * hardware that needs them to work.
1655                  */
1656
1657                 /*
1658                  * FIXME: fix reset when transport is SWD. This is a temporary
1659                  * work-around for release v0.10 that is not intended to stay!
1660                  */
1661                 if (transport_is_swd() ||
1662                                 (target->reset_halt && (jtag_get_reset_config() & RESET_SRST_NO_GATING)))
1663                         adapter_assert_reset();
1664
1665         } else {
1666                 LOG_ERROR("%s: how to reset?", target_name(target));
1667                 return ERROR_FAIL;
1668         }
1669
1670         /* registers are now invalid */
1671         if (target_was_examined(target))
1672                 register_cache_invalidate(armv7a->arm.core_cache);
1673
1674         target->state = TARGET_RESET;
1675
1676         return ERROR_OK;
1677 }
1678
1679 static int cortex_a_deassert_reset(struct target *target)
1680 {
1681         int retval;
1682
1683         LOG_DEBUG(" ");
1684
1685         /* be certain SRST is off */
1686         adapter_deassert_reset();
1687
1688         if (target_was_examined(target)) {
1689                 retval = cortex_a_poll(target);
1690                 if (retval != ERROR_OK)
1691                         return retval;
1692         }
1693
1694         if (target->reset_halt) {
1695                 if (target->state != TARGET_HALTED) {
1696                         LOG_WARNING("%s: ran after reset and before halt ...",
1697                                 target_name(target));
1698                         if (target_was_examined(target)) {
1699                                 retval = target_halt(target);
1700                                 if (retval != ERROR_OK)
1701                                         return retval;
1702                         } else
1703                                 target->state = TARGET_UNKNOWN;
1704                 }
1705         }
1706
1707         return ERROR_OK;
1708 }
1709
1710 static int cortex_a_set_dcc_mode(struct target *target, uint32_t mode, uint32_t *dscr)
1711 {
1712         /* Changes the mode of the DCC between non-blocking, stall, and fast mode.
1713          * New desired mode must be in mode. Current value of DSCR must be in
1714          * *dscr, which is updated with new value.
1715          *
1716          * This function elides actually sending the mode-change over the debug
1717          * interface if the mode is already set as desired.
1718          */
1719         uint32_t new_dscr = (*dscr & ~DSCR_EXT_DCC_MASK) | mode;
1720         if (new_dscr != *dscr) {
1721                 struct armv7a_common *armv7a = target_to_armv7a(target);
1722                 int retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
1723                                 armv7a->debug_base + CPUDBG_DSCR, new_dscr);
1724                 if (retval == ERROR_OK)
1725                         *dscr = new_dscr;
1726                 return retval;
1727         } else {
1728                 return ERROR_OK;
1729         }
1730 }
1731
1732 static int cortex_a_wait_dscr_bits(struct target *target, uint32_t mask,
1733         uint32_t value, uint32_t *dscr)
1734 {
1735         /* Waits until the specified bit(s) of DSCR take on a specified value. */
1736         struct armv7a_common *armv7a = target_to_armv7a(target);
1737         int64_t then;
1738         int retval;
1739
1740         if ((*dscr & mask) == value)
1741                 return ERROR_OK;
1742
1743         then = timeval_ms();
1744         while (1) {
1745                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
1746                                 armv7a->debug_base + CPUDBG_DSCR, dscr);
1747                 if (retval != ERROR_OK) {
1748                         LOG_ERROR("Could not read DSCR register");
1749                         return retval;
1750                 }
1751                 if ((*dscr & mask) == value)
1752                         break;
1753                 if (timeval_ms() > then + 1000) {
1754                         LOG_ERROR("timeout waiting for DSCR bit change");
1755                         return ERROR_FAIL;
1756                 }
1757         }
1758         return ERROR_OK;
1759 }
1760
1761 static int cortex_a_read_copro(struct target *target, uint32_t opcode,
1762         uint32_t *data, uint32_t *dscr)
1763 {
1764         int retval;
1765         struct armv7a_common *armv7a = target_to_armv7a(target);
1766
1767         /* Move from coprocessor to R0. */
1768         retval = cortex_a_exec_opcode(target, opcode, dscr);
1769         if (retval != ERROR_OK)
1770                 return retval;
1771
1772         /* Move from R0 to DTRTX. */
1773         retval = cortex_a_exec_opcode(target, ARMV4_5_MCR(14, 0, 0, 0, 5, 0), dscr);
1774         if (retval != ERROR_OK)
1775                 return retval;
1776
1777         /* Wait until DTRTX is full (according to ARMv7-A/-R architecture
1778          * manual section C8.4.3, checking InstrCmpl_l is not sufficient; one
1779          * must also check TXfull_l). Most of the time this will be free
1780          * because TXfull_l will be set immediately and cached in dscr. */
1781         retval = cortex_a_wait_dscr_bits(target, DSCR_DTRTX_FULL_LATCHED,
1782                         DSCR_DTRTX_FULL_LATCHED, dscr);
1783         if (retval != ERROR_OK)
1784                 return retval;
1785
1786         /* Read the value transferred to DTRTX. */
1787         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
1788                         armv7a->debug_base + CPUDBG_DTRTX, data);
1789         if (retval != ERROR_OK)
1790                 return retval;
1791
1792         return ERROR_OK;
1793 }
1794
1795 static int cortex_a_read_dfar_dfsr(struct target *target, uint32_t *dfar,
1796         uint32_t *dfsr, uint32_t *dscr)
1797 {
1798         int retval;
1799
1800         if (dfar) {
1801                 retval = cortex_a_read_copro(target, ARMV4_5_MRC(15, 0, 0, 6, 0, 0), dfar, dscr);
1802                 if (retval != ERROR_OK)
1803                         return retval;
1804         }
1805
1806         if (dfsr) {
1807                 retval = cortex_a_read_copro(target, ARMV4_5_MRC(15, 0, 0, 5, 0, 0), dfsr, dscr);
1808                 if (retval != ERROR_OK)
1809                         return retval;
1810         }
1811
1812         return ERROR_OK;
1813 }
1814
1815 static int cortex_a_write_copro(struct target *target, uint32_t opcode,
1816         uint32_t data, uint32_t *dscr)
1817 {
1818         int retval;
1819         struct armv7a_common *armv7a = target_to_armv7a(target);
1820
1821         /* Write the value into DTRRX. */
1822         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
1823                         armv7a->debug_base + CPUDBG_DTRRX, data);
1824         if (retval != ERROR_OK)
1825                 return retval;
1826
1827         /* Move from DTRRX to R0. */
1828         retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0), dscr);
1829         if (retval != ERROR_OK)
1830                 return retval;
1831
1832         /* Move from R0 to coprocessor. */
1833         retval = cortex_a_exec_opcode(target, opcode, dscr);
1834         if (retval != ERROR_OK)
1835                 return retval;
1836
1837         /* Wait until DTRRX is empty (according to ARMv7-A/-R architecture manual
1838          * section C8.4.3, checking InstrCmpl_l is not sufficient; one must also
1839          * check RXfull_l). Most of the time this will be free because RXfull_l
1840          * will be cleared immediately and cached in dscr. */
1841         retval = cortex_a_wait_dscr_bits(target, DSCR_DTRRX_FULL_LATCHED, 0, dscr);
1842         if (retval != ERROR_OK)
1843                 return retval;
1844
1845         return ERROR_OK;
1846 }
1847
1848 static int cortex_a_write_dfar_dfsr(struct target *target, uint32_t dfar,
1849         uint32_t dfsr, uint32_t *dscr)
1850 {
1851         int retval;
1852
1853         retval = cortex_a_write_copro(target, ARMV4_5_MCR(15, 0, 0, 6, 0, 0), dfar, dscr);
1854         if (retval != ERROR_OK)
1855                 return retval;
1856
1857         retval = cortex_a_write_copro(target, ARMV4_5_MCR(15, 0, 0, 5, 0, 0), dfsr, dscr);
1858         if (retval != ERROR_OK)
1859                 return retval;
1860
1861         return ERROR_OK;
1862 }
1863
1864 static int cortex_a_dfsr_to_error_code(uint32_t dfsr)
1865 {
1866         uint32_t status, upper4;
1867
1868         if (dfsr & (1 << 9)) {
1869                 /* LPAE format. */
1870                 status = dfsr & 0x3f;
1871                 upper4 = status >> 2;
1872                 if (upper4 == 1 || upper4 == 2 || upper4 == 3 || upper4 == 15)
1873                         return ERROR_TARGET_TRANSLATION_FAULT;
1874                 else if (status == 33)
1875                         return ERROR_TARGET_UNALIGNED_ACCESS;
1876                 else
1877                         return ERROR_TARGET_DATA_ABORT;
1878         } else {
1879                 /* Normal format. */
1880                 status = ((dfsr >> 6) & 0x10) | (dfsr & 0xf);
1881                 if (status == 1)
1882                         return ERROR_TARGET_UNALIGNED_ACCESS;
1883                 else if (status == 5 || status == 7 || status == 3 || status == 6 ||
1884                                 status == 9 || status == 11 || status == 13 || status == 15)
1885                         return ERROR_TARGET_TRANSLATION_FAULT;
1886                 else
1887                         return ERROR_TARGET_DATA_ABORT;
1888         }
1889 }
1890
1891 static int cortex_a_write_cpu_memory_slow(struct target *target,
1892         uint32_t size, uint32_t count, const uint8_t *buffer, uint32_t *dscr)
1893 {
1894         /* Writes count objects of size size from *buffer. Old value of DSCR must
1895          * be in *dscr; updated to new value. This is slow because it works for
1896          * non-word-sized objects and (maybe) unaligned accesses. If size == 4 and
1897          * the address is aligned, cortex_a_write_cpu_memory_fast should be
1898          * preferred.
1899          * Preconditions:
1900          * - Address is in R0.
1901          * - R0 is marked dirty.
1902          */
1903         struct armv7a_common *armv7a = target_to_armv7a(target);
1904         struct arm *arm = &armv7a->arm;
1905         int retval;
1906
1907         /* Mark register R1 as dirty, to use for transferring data. */
1908         arm_reg_current(arm, 1)->dirty = true;
1909
1910         /* Switch to non-blocking mode if not already in that mode. */
1911         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, dscr);
1912         if (retval != ERROR_OK)
1913                 return retval;
1914
1915         /* Go through the objects. */
1916         while (count) {
1917                 /* Write the value to store into DTRRX. */
1918                 uint32_t data, opcode;
1919                 if (size == 1)
1920                         data = *buffer;
1921                 else if (size == 2)
1922                         data = target_buffer_get_u16(target, buffer);
1923                 else
1924                         data = target_buffer_get_u32(target, buffer);
1925                 retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
1926                                 armv7a->debug_base + CPUDBG_DTRRX, data);
1927                 if (retval != ERROR_OK)
1928                         return retval;
1929
1930                 /* Transfer the value from DTRRX to R1. */
1931                 retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 1, 0, 5, 0), dscr);
1932                 if (retval != ERROR_OK)
1933                         return retval;
1934
1935                 /* Write the value transferred to R1 into memory. */
1936                 if (size == 1)
1937                         opcode = ARMV4_5_STRB_IP(1, 0);
1938                 else if (size == 2)
1939                         opcode = ARMV4_5_STRH_IP(1, 0);
1940                 else
1941                         opcode = ARMV4_5_STRW_IP(1, 0);
1942                 retval = cortex_a_exec_opcode(target, opcode, dscr);
1943                 if (retval != ERROR_OK)
1944                         return retval;
1945
1946                 /* Check for faults and return early. */
1947                 if (*dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE))
1948                         return ERROR_OK; /* A data fault is not considered a system failure. */
1949
1950                 /* Wait until DTRRX is empty (according to ARMv7-A/-R architecture
1951                  * manual section C8.4.3, checking InstrCmpl_l is not sufficient; one
1952                  * must also check RXfull_l). Most of the time this will be free
1953                  * because RXfull_l will be cleared immediately and cached in dscr. */
1954                 retval = cortex_a_wait_dscr_bits(target, DSCR_DTRRX_FULL_LATCHED, 0, dscr);
1955                 if (retval != ERROR_OK)
1956                         return retval;
1957
1958                 /* Advance. */
1959                 buffer += size;
1960                 --count;
1961         }
1962
1963         return ERROR_OK;
1964 }
1965
1966 static int cortex_a_write_cpu_memory_fast(struct target *target,
1967         uint32_t count, const uint8_t *buffer, uint32_t *dscr)
1968 {
1969         /* Writes count objects of size 4 from *buffer. Old value of DSCR must be
1970          * in *dscr; updated to new value. This is fast but only works for
1971          * word-sized objects at aligned addresses.
1972          * Preconditions:
1973          * - Address is in R0 and must be a multiple of 4.
1974          * - R0 is marked dirty.
1975          */
1976         struct armv7a_common *armv7a = target_to_armv7a(target);
1977         int retval;
1978
1979         /* Switch to fast mode if not already in that mode. */
1980         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_FAST_MODE, dscr);
1981         if (retval != ERROR_OK)
1982                 return retval;
1983
1984         /* Latch STC instruction. */
1985         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
1986                         armv7a->debug_base + CPUDBG_ITR, ARMV4_5_STC(0, 1, 0, 1, 14, 5, 0, 4));
1987         if (retval != ERROR_OK)
1988                 return retval;
1989
1990         /* Transfer all the data and issue all the instructions. */
1991         return mem_ap_write_buf_noincr(armv7a->debug_ap, buffer,
1992                         4, count, armv7a->debug_base + CPUDBG_DTRRX);
1993 }
1994
1995 static int cortex_a_write_cpu_memory(struct target *target,
1996         uint32_t address, uint32_t size,
1997         uint32_t count, const uint8_t *buffer)
1998 {
1999         /* Write memory through the CPU. */
2000         int retval, final_retval;
2001         struct armv7a_common *armv7a = target_to_armv7a(target);
2002         struct arm *arm = &armv7a->arm;
2003         uint32_t dscr, orig_dfar, orig_dfsr, fault_dscr, fault_dfar, fault_dfsr;
2004
2005         LOG_DEBUG("Writing CPU memory address 0x%" PRIx32 " size %"  PRIu32 " count %"  PRIu32,
2006                           address, size, count);
2007         if (target->state != TARGET_HALTED) {
2008                 LOG_WARNING("target not halted");
2009                 return ERROR_TARGET_NOT_HALTED;
2010         }
2011
2012         if (!count)
2013                 return ERROR_OK;
2014
2015         /* Clear any abort. */
2016         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2017                         armv7a->debug_base + CPUDBG_DRCR, DRCR_CLEAR_EXCEPTIONS);
2018         if (retval != ERROR_OK)
2019                 return retval;
2020
2021         /* Read DSCR. */
2022         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2023                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
2024         if (retval != ERROR_OK)
2025                 return retval;
2026
2027         /* Switch to non-blocking mode if not already in that mode. */
2028         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, &dscr);
2029         if (retval != ERROR_OK)
2030                 goto out;
2031
2032         /* Mark R0 as dirty. */
2033         arm_reg_current(arm, 0)->dirty = true;
2034
2035         /* Read DFAR and DFSR, as they will be modified in the event of a fault. */
2036         retval = cortex_a_read_dfar_dfsr(target, &orig_dfar, &orig_dfsr, &dscr);
2037         if (retval != ERROR_OK)
2038                 goto out;
2039
2040         /* Get the memory address into R0. */
2041         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2042                         armv7a->debug_base + CPUDBG_DTRRX, address);
2043         if (retval != ERROR_OK)
2044                 goto out;
2045         retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0), &dscr);
2046         if (retval != ERROR_OK)
2047                 goto out;
2048
2049         if (size == 4 && (address % 4) == 0) {
2050                 /* We are doing a word-aligned transfer, so use fast mode. */
2051                 retval = cortex_a_write_cpu_memory_fast(target, count, buffer, &dscr);
2052         } else {
2053                 /* Use slow path. */
2054                 retval = cortex_a_write_cpu_memory_slow(target, size, count, buffer, &dscr);
2055         }
2056
2057 out:
2058         final_retval = retval;
2059
2060         /* Switch to non-blocking mode if not already in that mode. */
2061         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, &dscr);
2062         if (final_retval == ERROR_OK)
2063                 final_retval = retval;
2064
2065         /* Wait for last issued instruction to complete. */
2066         retval = cortex_a_wait_instrcmpl(target, &dscr, true);
2067         if (final_retval == ERROR_OK)
2068                 final_retval = retval;
2069
2070         /* Wait until DTRRX is empty (according to ARMv7-A/-R architecture manual
2071          * section C8.4.3, checking InstrCmpl_l is not sufficient; one must also
2072          * check RXfull_l). Most of the time this will be free because RXfull_l
2073          * will be cleared immediately and cached in dscr. However, don't do this
2074          * if there is fault, because then the instruction might not have completed
2075          * successfully. */
2076         if (!(dscr & DSCR_STICKY_ABORT_PRECISE)) {
2077                 retval = cortex_a_wait_dscr_bits(target, DSCR_DTRRX_FULL_LATCHED, 0, &dscr);
2078                 if (retval != ERROR_OK)
2079                         return retval;
2080         }
2081
2082         /* If there were any sticky abort flags, clear them. */
2083         if (dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE)) {
2084                 fault_dscr = dscr;
2085                 mem_ap_write_atomic_u32(armv7a->debug_ap,
2086                                 armv7a->debug_base + CPUDBG_DRCR, DRCR_CLEAR_EXCEPTIONS);
2087                 dscr &= ~(DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE);
2088         } else {
2089                 fault_dscr = 0;
2090         }
2091
2092         /* Handle synchronous data faults. */
2093         if (fault_dscr & DSCR_STICKY_ABORT_PRECISE) {
2094                 if (final_retval == ERROR_OK) {
2095                         /* Final return value will reflect cause of fault. */
2096                         retval = cortex_a_read_dfar_dfsr(target, &fault_dfar, &fault_dfsr, &dscr);
2097                         if (retval == ERROR_OK) {
2098                                 LOG_ERROR("data abort at 0x%08" PRIx32 ", dfsr = 0x%08" PRIx32, fault_dfar, fault_dfsr);
2099                                 final_retval = cortex_a_dfsr_to_error_code(fault_dfsr);
2100                         } else
2101                                 final_retval = retval;
2102                 }
2103                 /* Fault destroyed DFAR/DFSR; restore them. */
2104                 retval = cortex_a_write_dfar_dfsr(target, orig_dfar, orig_dfsr, &dscr);
2105                 if (retval != ERROR_OK)
2106                         LOG_ERROR("error restoring dfar/dfsr - dscr = 0x%08" PRIx32, dscr);
2107         }
2108
2109         /* Handle asynchronous data faults. */
2110         if (fault_dscr & DSCR_STICKY_ABORT_IMPRECISE) {
2111                 if (final_retval == ERROR_OK)
2112                         /* No other error has been recorded so far, so keep this one. */
2113                         final_retval = ERROR_TARGET_DATA_ABORT;
2114         }
2115
2116         /* If the DCC is nonempty, clear it. */
2117         if (dscr & DSCR_DTRTX_FULL_LATCHED) {
2118                 uint32_t dummy;
2119                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2120                                 armv7a->debug_base + CPUDBG_DTRTX, &dummy);
2121                 if (final_retval == ERROR_OK)
2122                         final_retval = retval;
2123         }
2124         if (dscr & DSCR_DTRRX_FULL_LATCHED) {
2125                 retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 1, 0, 5, 0), &dscr);
2126                 if (final_retval == ERROR_OK)
2127                         final_retval = retval;
2128         }
2129
2130         /* Done. */
2131         return final_retval;
2132 }
2133
2134 static int cortex_a_read_cpu_memory_slow(struct target *target,
2135         uint32_t size, uint32_t count, uint8_t *buffer, uint32_t *dscr)
2136 {
2137         /* Reads count objects of size size into *buffer. Old value of DSCR must be
2138          * in *dscr; updated to new value. This is slow because it works for
2139          * non-word-sized objects and (maybe) unaligned accesses. If size == 4 and
2140          * the address is aligned, cortex_a_read_cpu_memory_fast should be
2141          * preferred.
2142          * Preconditions:
2143          * - Address is in R0.
2144          * - R0 is marked dirty.
2145          */
2146         struct armv7a_common *armv7a = target_to_armv7a(target);
2147         struct arm *arm = &armv7a->arm;
2148         int retval;
2149
2150         /* Mark register R1 as dirty, to use for transferring data. */
2151         arm_reg_current(arm, 1)->dirty = true;
2152
2153         /* Switch to non-blocking mode if not already in that mode. */
2154         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, dscr);
2155         if (retval != ERROR_OK)
2156                 return retval;
2157
2158         /* Go through the objects. */
2159         while (count) {
2160                 /* Issue a load of the appropriate size to R1. */
2161                 uint32_t opcode, data;
2162                 if (size == 1)
2163                         opcode = ARMV4_5_LDRB_IP(1, 0);
2164                 else if (size == 2)
2165                         opcode = ARMV4_5_LDRH_IP(1, 0);
2166                 else
2167                         opcode = ARMV4_5_LDRW_IP(1, 0);
2168                 retval = cortex_a_exec_opcode(target, opcode, dscr);
2169                 if (retval != ERROR_OK)
2170                         return retval;
2171
2172                 /* Issue a write of R1 to DTRTX. */
2173                 retval = cortex_a_exec_opcode(target, ARMV4_5_MCR(14, 0, 1, 0, 5, 0), dscr);
2174                 if (retval != ERROR_OK)
2175                         return retval;
2176
2177                 /* Check for faults and return early. */
2178                 if (*dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE))
2179                         return ERROR_OK; /* A data fault is not considered a system failure. */
2180
2181                 /* Wait until DTRTX is full (according to ARMv7-A/-R architecture
2182                  * manual section C8.4.3, checking InstrCmpl_l is not sufficient; one
2183                  * must also check TXfull_l). Most of the time this will be free
2184                  * because TXfull_l will be set immediately and cached in dscr. */
2185                 retval = cortex_a_wait_dscr_bits(target, DSCR_DTRTX_FULL_LATCHED,
2186                                 DSCR_DTRTX_FULL_LATCHED, dscr);
2187                 if (retval != ERROR_OK)
2188                         return retval;
2189
2190                 /* Read the value transferred to DTRTX into the buffer. */
2191                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2192                                 armv7a->debug_base + CPUDBG_DTRTX, &data);
2193                 if (retval != ERROR_OK)
2194                         return retval;
2195                 if (size == 1)
2196                         *buffer = (uint8_t) data;
2197                 else if (size == 2)
2198                         target_buffer_set_u16(target, buffer, (uint16_t) data);
2199                 else
2200                         target_buffer_set_u32(target, buffer, data);
2201
2202                 /* Advance. */
2203                 buffer += size;
2204                 --count;
2205         }
2206
2207         return ERROR_OK;
2208 }
2209
2210 static int cortex_a_read_cpu_memory_fast(struct target *target,
2211         uint32_t count, uint8_t *buffer, uint32_t *dscr)
2212 {
2213         /* Reads count objects of size 4 into *buffer. Old value of DSCR must be in
2214          * *dscr; updated to new value. This is fast but only works for word-sized
2215          * objects at aligned addresses.
2216          * Preconditions:
2217          * - Address is in R0 and must be a multiple of 4.
2218          * - R0 is marked dirty.
2219          */
2220         struct armv7a_common *armv7a = target_to_armv7a(target);
2221         uint32_t u32;
2222         int retval;
2223
2224         /* Switch to non-blocking mode if not already in that mode. */
2225         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, dscr);
2226         if (retval != ERROR_OK)
2227                 return retval;
2228
2229         /* Issue the LDC instruction via a write to ITR. */
2230         retval = cortex_a_exec_opcode(target, ARMV4_5_LDC(0, 1, 0, 1, 14, 5, 0, 4), dscr);
2231         if (retval != ERROR_OK)
2232                 return retval;
2233
2234         count--;
2235
2236         if (count > 0) {
2237                 /* Switch to fast mode if not already in that mode. */
2238                 retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_FAST_MODE, dscr);
2239                 if (retval != ERROR_OK)
2240                         return retval;
2241
2242                 /* Latch LDC instruction. */
2243                 retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2244                                 armv7a->debug_base + CPUDBG_ITR, ARMV4_5_LDC(0, 1, 0, 1, 14, 5, 0, 4));
2245                 if (retval != ERROR_OK)
2246                         return retval;
2247
2248                 /* Read the value transferred to DTRTX into the buffer. Due to fast
2249                  * mode rules, this blocks until the instruction finishes executing and
2250                  * then reissues the read instruction to read the next word from
2251                  * memory. The last read of DTRTX in this call reads the second-to-last
2252                  * word from memory and issues the read instruction for the last word.
2253                  */
2254                 retval = mem_ap_read_buf_noincr(armv7a->debug_ap, buffer,
2255                                 4, count, armv7a->debug_base + CPUDBG_DTRTX);
2256                 if (retval != ERROR_OK)
2257                         return retval;
2258
2259                 /* Advance. */
2260                 buffer += count * 4;
2261         }
2262
2263         /* Wait for last issued instruction to complete. */
2264         retval = cortex_a_wait_instrcmpl(target, dscr, false);
2265         if (retval != ERROR_OK)
2266                 return retval;
2267
2268         /* Switch to non-blocking mode if not already in that mode. */
2269         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, dscr);
2270         if (retval != ERROR_OK)
2271                 return retval;
2272
2273         /* Check for faults and return early. */
2274         if (*dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE))
2275                 return ERROR_OK; /* A data fault is not considered a system failure. */
2276
2277         /* Wait until DTRTX is full (according to ARMv7-A/-R architecture manual
2278          * section C8.4.3, checking InstrCmpl_l is not sufficient; one must also
2279          * check TXfull_l). Most of the time this will be free because TXfull_l
2280          * will be set immediately and cached in dscr. */
2281         retval = cortex_a_wait_dscr_bits(target, DSCR_DTRTX_FULL_LATCHED,
2282                         DSCR_DTRTX_FULL_LATCHED, dscr);
2283         if (retval != ERROR_OK)
2284                 return retval;
2285
2286         /* Read the value transferred to DTRTX into the buffer. This is the last
2287          * word. */
2288         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2289                         armv7a->debug_base + CPUDBG_DTRTX, &u32);
2290         if (retval != ERROR_OK)
2291                 return retval;
2292         target_buffer_set_u32(target, buffer, u32);
2293
2294         return ERROR_OK;
2295 }
2296
2297 static int cortex_a_read_cpu_memory(struct target *target,
2298         uint32_t address, uint32_t size,
2299         uint32_t count, uint8_t *buffer)
2300 {
2301         /* Read memory through the CPU. */
2302         int retval, final_retval;
2303         struct armv7a_common *armv7a = target_to_armv7a(target);
2304         struct arm *arm = &armv7a->arm;
2305         uint32_t dscr, orig_dfar, orig_dfsr, fault_dscr, fault_dfar, fault_dfsr;
2306
2307         LOG_DEBUG("Reading CPU memory address 0x%" PRIx32 " size %"  PRIu32 " count %"  PRIu32,
2308                           address, size, count);
2309         if (target->state != TARGET_HALTED) {
2310                 LOG_WARNING("target not halted");
2311                 return ERROR_TARGET_NOT_HALTED;
2312         }
2313
2314         if (!count)
2315                 return ERROR_OK;
2316
2317         /* Clear any abort. */
2318         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2319                         armv7a->debug_base + CPUDBG_DRCR, DRCR_CLEAR_EXCEPTIONS);
2320         if (retval != ERROR_OK)
2321                 return retval;
2322
2323         /* Read DSCR */
2324         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2325                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
2326         if (retval != ERROR_OK)
2327                 return retval;
2328
2329         /* Switch to non-blocking mode if not already in that mode. */
2330         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, &dscr);
2331         if (retval != ERROR_OK)
2332                 goto out;
2333
2334         /* Mark R0 as dirty. */
2335         arm_reg_current(arm, 0)->dirty = true;
2336
2337         /* Read DFAR and DFSR, as they will be modified in the event of a fault. */
2338         retval = cortex_a_read_dfar_dfsr(target, &orig_dfar, &orig_dfsr, &dscr);
2339         if (retval != ERROR_OK)
2340                 goto out;
2341
2342         /* Get the memory address into R0. */
2343         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2344                         armv7a->debug_base + CPUDBG_DTRRX, address);
2345         if (retval != ERROR_OK)
2346                 goto out;
2347         retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0), &dscr);
2348         if (retval != ERROR_OK)
2349                 goto out;
2350
2351         if (size == 4 && (address % 4) == 0) {
2352                 /* We are doing a word-aligned transfer, so use fast mode. */
2353                 retval = cortex_a_read_cpu_memory_fast(target, count, buffer, &dscr);
2354         } else {
2355                 /* Use slow path. */
2356                 retval = cortex_a_read_cpu_memory_slow(target, size, count, buffer, &dscr);
2357         }
2358
2359 out:
2360         final_retval = retval;
2361
2362         /* Switch to non-blocking mode if not already in that mode. */
2363         retval = cortex_a_set_dcc_mode(target, DSCR_EXT_DCC_NON_BLOCKING, &dscr);
2364         if (final_retval == ERROR_OK)
2365                 final_retval = retval;
2366
2367         /* Wait for last issued instruction to complete. */
2368         retval = cortex_a_wait_instrcmpl(target, &dscr, true);
2369         if (final_retval == ERROR_OK)
2370                 final_retval = retval;
2371
2372         /* If there were any sticky abort flags, clear them. */
2373         if (dscr & (DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE)) {
2374                 fault_dscr = dscr;
2375                 mem_ap_write_atomic_u32(armv7a->debug_ap,
2376                                 armv7a->debug_base + CPUDBG_DRCR, DRCR_CLEAR_EXCEPTIONS);
2377                 dscr &= ~(DSCR_STICKY_ABORT_PRECISE | DSCR_STICKY_ABORT_IMPRECISE);
2378         } else {
2379                 fault_dscr = 0;
2380         }
2381
2382         /* Handle synchronous data faults. */
2383         if (fault_dscr & DSCR_STICKY_ABORT_PRECISE) {
2384                 if (final_retval == ERROR_OK) {
2385                         /* Final return value will reflect cause of fault. */
2386                         retval = cortex_a_read_dfar_dfsr(target, &fault_dfar, &fault_dfsr, &dscr);
2387                         if (retval == ERROR_OK) {
2388                                 LOG_ERROR("data abort at 0x%08" PRIx32 ", dfsr = 0x%08" PRIx32, fault_dfar, fault_dfsr);
2389                                 final_retval = cortex_a_dfsr_to_error_code(fault_dfsr);
2390                         } else
2391                                 final_retval = retval;
2392                 }
2393                 /* Fault destroyed DFAR/DFSR; restore them. */
2394                 retval = cortex_a_write_dfar_dfsr(target, orig_dfar, orig_dfsr, &dscr);
2395                 if (retval != ERROR_OK)
2396                         LOG_ERROR("error restoring dfar/dfsr - dscr = 0x%08" PRIx32, dscr);
2397         }
2398
2399         /* Handle asynchronous data faults. */
2400         if (fault_dscr & DSCR_STICKY_ABORT_IMPRECISE) {
2401                 if (final_retval == ERROR_OK)
2402                         /* No other error has been recorded so far, so keep this one. */
2403                         final_retval = ERROR_TARGET_DATA_ABORT;
2404         }
2405
2406         /* If the DCC is nonempty, clear it. */
2407         if (dscr & DSCR_DTRTX_FULL_LATCHED) {
2408                 uint32_t dummy;
2409                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2410                                 armv7a->debug_base + CPUDBG_DTRTX, &dummy);
2411                 if (final_retval == ERROR_OK)
2412                         final_retval = retval;
2413         }
2414         if (dscr & DSCR_DTRRX_FULL_LATCHED) {
2415                 retval = cortex_a_exec_opcode(target, ARMV4_5_MRC(14, 0, 1, 0, 5, 0), &dscr);
2416                 if (final_retval == ERROR_OK)
2417                         final_retval = retval;
2418         }
2419
2420         /* Done. */
2421         return final_retval;
2422 }
2423
2424
2425 /*
2426  * Cortex-A Memory access
2427  *
2428  * This is same Cortex-M3 but we must also use the correct
2429  * ap number for every access.
2430  */
2431
2432 static int cortex_a_read_phys_memory(struct target *target,
2433         target_addr_t address, uint32_t size,
2434         uint32_t count, uint8_t *buffer)
2435 {
2436         int retval;
2437
2438         if (!count || !buffer)
2439                 return ERROR_COMMAND_SYNTAX_ERROR;
2440
2441         LOG_DEBUG("Reading memory at real address " TARGET_ADDR_FMT "; size %" PRId32 "; count %" PRId32,
2442                 address, size, count);
2443
2444         /* read memory through the CPU */
2445         cortex_a_prep_memaccess(target, 1);
2446         retval = cortex_a_read_cpu_memory(target, address, size, count, buffer);
2447         cortex_a_post_memaccess(target, 1);
2448
2449         return retval;
2450 }
2451
2452 static int cortex_a_read_memory(struct target *target, target_addr_t address,
2453         uint32_t size, uint32_t count, uint8_t *buffer)
2454 {
2455         int retval;
2456
2457         /* cortex_a handles unaligned memory access */
2458         LOG_DEBUG("Reading memory at address " TARGET_ADDR_FMT "; size %" PRId32 "; count %" PRId32,
2459                 address, size, count);
2460
2461         cortex_a_prep_memaccess(target, 0);
2462         retval = cortex_a_read_cpu_memory(target, address, size, count, buffer);
2463         cortex_a_post_memaccess(target, 0);
2464
2465         return retval;
2466 }
2467
2468 static int cortex_a_write_phys_memory(struct target *target,
2469         target_addr_t address, uint32_t size,
2470         uint32_t count, const uint8_t *buffer)
2471 {
2472         int retval;
2473
2474         if (!count || !buffer)
2475                 return ERROR_COMMAND_SYNTAX_ERROR;
2476
2477         LOG_DEBUG("Writing memory to real address " TARGET_ADDR_FMT "; size %" PRId32 "; count %" PRId32,
2478                 address, size, count);
2479
2480         /* write memory through the CPU */
2481         cortex_a_prep_memaccess(target, 1);
2482         retval = cortex_a_write_cpu_memory(target, address, size, count, buffer);
2483         cortex_a_post_memaccess(target, 1);
2484
2485         return retval;
2486 }
2487
2488 static int cortex_a_write_memory(struct target *target, target_addr_t address,
2489         uint32_t size, uint32_t count, const uint8_t *buffer)
2490 {
2491         int retval;
2492
2493         /* cortex_a handles unaligned memory access */
2494         LOG_DEBUG("Writing memory at address " TARGET_ADDR_FMT "; size %" PRId32 "; count %" PRId32,
2495                 address, size, count);
2496
2497         /* memory writes bypass the caches, must flush before writing */
2498         armv7a_cache_auto_flush_on_write(target, address, size * count);
2499
2500         cortex_a_prep_memaccess(target, 0);
2501         retval = cortex_a_write_cpu_memory(target, address, size, count, buffer);
2502         cortex_a_post_memaccess(target, 0);
2503         return retval;
2504 }
2505
2506 static int cortex_a_read_buffer(struct target *target, target_addr_t address,
2507                                 uint32_t count, uint8_t *buffer)
2508 {
2509         uint32_t size;
2510
2511         /* Align up to maximum 4 bytes. The loop condition makes sure the next pass
2512          * will have something to do with the size we leave to it. */
2513         for (size = 1; size < 4 && count >= size * 2 + (address & size); size *= 2) {
2514                 if (address & size) {
2515                         int retval = target_read_memory(target, address, size, 1, buffer);
2516                         if (retval != ERROR_OK)
2517                                 return retval;
2518                         address += size;
2519                         count -= size;
2520                         buffer += size;
2521                 }
2522         }
2523
2524         /* Read the data with as large access size as possible. */
2525         for (; size > 0; size /= 2) {
2526                 uint32_t aligned = count - count % size;
2527                 if (aligned > 0) {
2528                         int retval = target_read_memory(target, address, size, aligned / size, buffer);
2529                         if (retval != ERROR_OK)
2530                                 return retval;
2531                         address += aligned;
2532                         count -= aligned;
2533                         buffer += aligned;
2534                 }
2535         }
2536
2537         return ERROR_OK;
2538 }
2539
2540 static int cortex_a_write_buffer(struct target *target, target_addr_t address,
2541                                  uint32_t count, const uint8_t *buffer)
2542 {
2543         uint32_t size;
2544
2545         /* Align up to maximum 4 bytes. The loop condition makes sure the next pass
2546          * will have something to do with the size we leave to it. */
2547         for (size = 1; size < 4 && count >= size * 2 + (address & size); size *= 2) {
2548                 if (address & size) {
2549                         int retval = target_write_memory(target, address, size, 1, buffer);
2550                         if (retval != ERROR_OK)
2551                                 return retval;
2552                         address += size;
2553                         count -= size;
2554                         buffer += size;
2555                 }
2556         }
2557
2558         /* Write the data with as large access size as possible. */
2559         for (; size > 0; size /= 2) {
2560                 uint32_t aligned = count - count % size;
2561                 if (aligned > 0) {
2562                         int retval = target_write_memory(target, address, size, aligned / size, buffer);
2563                         if (retval != ERROR_OK)
2564                                 return retval;
2565                         address += aligned;
2566                         count -= aligned;
2567                         buffer += aligned;
2568                 }
2569         }
2570
2571         return ERROR_OK;
2572 }
2573
2574 static int cortex_a_handle_target_request(void *priv)
2575 {
2576         struct target *target = priv;
2577         struct armv7a_common *armv7a = target_to_armv7a(target);
2578         int retval;
2579
2580         if (!target_was_examined(target))
2581                 return ERROR_OK;
2582         if (!target->dbg_msg_enabled)
2583                 return ERROR_OK;
2584
2585         if (target->state == TARGET_RUNNING) {
2586                 uint32_t request;
2587                 uint32_t dscr;
2588                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2589                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
2590
2591                 /* check if we have data */
2592                 int64_t then = timeval_ms();
2593                 while ((dscr & DSCR_DTR_TX_FULL) && (retval == ERROR_OK)) {
2594                         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2595                                         armv7a->debug_base + CPUDBG_DTRTX, &request);
2596                         if (retval == ERROR_OK) {
2597                                 target_request(target, request);
2598                                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2599                                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
2600                         }
2601                         if (timeval_ms() > then + 1000) {
2602                                 LOG_ERROR("Timeout waiting for dtr tx full");
2603                                 return ERROR_FAIL;
2604                         }
2605                 }
2606         }
2607
2608         return ERROR_OK;
2609 }
2610
2611 /*
2612  * Cortex-A target information and configuration
2613  */
2614
2615 static int cortex_a_examine_first(struct target *target)
2616 {
2617         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
2618         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
2619         struct adiv5_dap *swjdp = armv7a->arm.dap;
2620
2621         int i;
2622         int retval = ERROR_OK;
2623         uint32_t didr, cpuid, dbg_osreg;
2624
2625         /* Search for the APB-AP - it is needed for access to debug registers */
2626         retval = dap_find_ap(swjdp, AP_TYPE_APB_AP, &armv7a->debug_ap);
2627         if (retval != ERROR_OK) {
2628                 LOG_ERROR("Could not find APB-AP for debug access");
2629                 return retval;
2630         }
2631
2632         retval = mem_ap_init(armv7a->debug_ap);
2633         if (retval != ERROR_OK) {
2634                 LOG_ERROR("Could not initialize the APB-AP");
2635                 return retval;
2636         }
2637
2638         armv7a->debug_ap->memaccess_tck = 80;
2639
2640         if (!target->dbgbase_set) {
2641                 uint32_t dbgbase;
2642                 /* Get ROM Table base */
2643                 uint32_t apid;
2644                 int32_t coreidx = target->coreid;
2645                 LOG_DEBUG("%s's dbgbase is not set, trying to detect using the ROM table",
2646                           target->cmd_name);
2647                 retval = dap_get_debugbase(armv7a->debug_ap, &dbgbase, &apid);
2648                 if (retval != ERROR_OK)
2649                         return retval;
2650                 /* Lookup 0x15 -- Processor DAP */
2651                 retval = dap_lookup_cs_component(armv7a->debug_ap, dbgbase, 0x15,
2652                                 &armv7a->debug_base, &coreidx);
2653                 if (retval != ERROR_OK) {
2654                         LOG_ERROR("Can't detect %s's dbgbase from the ROM table; you need to specify it explicitly.",
2655                                   target->cmd_name);
2656                         return retval;
2657                 }
2658                 LOG_DEBUG("Detected core %" PRId32 " dbgbase: %08" PRIx32,
2659                           target->coreid, armv7a->debug_base);
2660         } else
2661                 armv7a->debug_base = target->dbgbase;
2662
2663         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2664                         armv7a->debug_base + CPUDBG_DIDR, &didr);
2665         if (retval != ERROR_OK) {
2666                 LOG_DEBUG("Examine %s failed", "DIDR");
2667                 return retval;
2668         }
2669
2670         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2671                         armv7a->debug_base + CPUDBG_CPUID, &cpuid);
2672         if (retval != ERROR_OK) {
2673                 LOG_DEBUG("Examine %s failed", "CPUID");
2674                 return retval;
2675         }
2676
2677         LOG_DEBUG("didr = 0x%08" PRIx32, didr);
2678         LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
2679
2680         cortex_a->didr = didr;
2681         cortex_a->cpuid = cpuid;
2682
2683         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2684                                     armv7a->debug_base + CPUDBG_PRSR, &dbg_osreg);
2685         if (retval != ERROR_OK)
2686                 return retval;
2687         LOG_DEBUG("target->coreid %" PRId32 " DBGPRSR  0x%" PRIx32, target->coreid, dbg_osreg);
2688
2689         if ((dbg_osreg & PRSR_POWERUP_STATUS) == 0) {
2690                 LOG_ERROR("target->coreid %" PRId32 " powered down!", target->coreid);
2691                 target->state = TARGET_UNKNOWN; /* TARGET_NO_POWER? */
2692                 return ERROR_TARGET_INIT_FAILED;
2693         }
2694
2695         if (dbg_osreg & PRSR_STICKY_RESET_STATUS)
2696                 LOG_DEBUG("target->coreid %" PRId32 " was reset!", target->coreid);
2697
2698         /* Read DBGOSLSR and check if OSLK is implemented */
2699         retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2700                                 armv7a->debug_base + CPUDBG_OSLSR, &dbg_osreg);
2701         if (retval != ERROR_OK)
2702                 return retval;
2703         LOG_DEBUG("target->coreid %" PRId32 " DBGOSLSR 0x%" PRIx32, target->coreid, dbg_osreg);
2704
2705         /* check if OS Lock is implemented */
2706         if ((dbg_osreg & OSLSR_OSLM) == OSLSR_OSLM0 || (dbg_osreg & OSLSR_OSLM) == OSLSR_OSLM1) {
2707                 /* check if OS Lock is set */
2708                 if (dbg_osreg & OSLSR_OSLK) {
2709                         LOG_DEBUG("target->coreid %" PRId32 " OSLock set! Trying to unlock", target->coreid);
2710
2711                         retval = mem_ap_write_atomic_u32(armv7a->debug_ap,
2712                                                         armv7a->debug_base + CPUDBG_OSLAR,
2713                                                         0);
2714                         if (retval == ERROR_OK)
2715                                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2716                                                         armv7a->debug_base + CPUDBG_OSLSR, &dbg_osreg);
2717
2718                         /* if we fail to access the register or cannot reset the OSLK bit, bail out */
2719                         if (retval != ERROR_OK || (dbg_osreg & OSLSR_OSLK) != 0) {
2720                                 LOG_ERROR("target->coreid %" PRId32 " OSLock sticky, core not powered?",
2721                                                 target->coreid);
2722                                 target->state = TARGET_UNKNOWN; /* TARGET_NO_POWER? */
2723                                 return ERROR_TARGET_INIT_FAILED;
2724                         }
2725                 }
2726         }
2727
2728         armv7a->arm.core_type = ARM_MODE_MON;
2729
2730         /* Avoid recreating the registers cache */
2731         if (!target_was_examined(target)) {
2732                 retval = cortex_a_dpm_setup(cortex_a, didr);
2733                 if (retval != ERROR_OK)
2734                         return retval;
2735         }
2736
2737         /* Setup Breakpoint Register Pairs */
2738         cortex_a->brp_num = ((didr >> 24) & 0x0F) + 1;
2739         cortex_a->brp_num_context = ((didr >> 20) & 0x0F) + 1;
2740         cortex_a->brp_num_available = cortex_a->brp_num;
2741         free(cortex_a->brp_list);
2742         cortex_a->brp_list = calloc(cortex_a->brp_num, sizeof(struct cortex_a_brp));
2743 /*      cortex_a->brb_enabled = ????; */
2744         for (i = 0; i < cortex_a->brp_num; i++) {
2745                 cortex_a->brp_list[i].used = 0;
2746                 if (i < (cortex_a->brp_num-cortex_a->brp_num_context))
2747                         cortex_a->brp_list[i].type = BRP_NORMAL;
2748                 else
2749                         cortex_a->brp_list[i].type = BRP_CONTEXT;
2750                 cortex_a->brp_list[i].value = 0;
2751                 cortex_a->brp_list[i].control = 0;
2752                 cortex_a->brp_list[i].BRPn = i;
2753         }
2754
2755         LOG_DEBUG("Configured %i hw breakpoints", cortex_a->brp_num);
2756
2757         /* select debug_ap as default */
2758         swjdp->apsel = armv7a->debug_ap->ap_num;
2759
2760         target_set_examined(target);
2761         return ERROR_OK;
2762 }
2763
2764 static int cortex_a_examine(struct target *target)
2765 {
2766         int retval = ERROR_OK;
2767
2768         /* Reestablish communication after target reset */
2769         retval = cortex_a_examine_first(target);
2770
2771         /* Configure core debug access */
2772         if (retval == ERROR_OK)
2773                 retval = cortex_a_init_debug_access(target);
2774
2775         return retval;
2776 }
2777
2778 /*
2779  *      Cortex-A target creation and initialization
2780  */
2781
2782 static int cortex_a_init_target(struct command_context *cmd_ctx,
2783         struct target *target)
2784 {
2785         /* examine_first() does a bunch of this */
2786         arm_semihosting_init(target);
2787         return ERROR_OK;
2788 }
2789
2790 static int cortex_a_init_arch_info(struct target *target,
2791         struct cortex_a_common *cortex_a, struct adiv5_dap *dap)
2792 {
2793         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
2794
2795         /* Setup struct cortex_a_common */
2796         cortex_a->common_magic = CORTEX_A_COMMON_MAGIC;
2797         armv7a->arm.dap = dap;
2798
2799         /* register arch-specific functions */
2800         armv7a->examine_debug_reason = NULL;
2801
2802         armv7a->post_debug_entry = cortex_a_post_debug_entry;
2803
2804         armv7a->pre_restore_context = NULL;
2805
2806         armv7a->armv7a_mmu.read_physical_memory = cortex_a_read_phys_memory;
2807
2808
2809 /*      arm7_9->handle_target_request = cortex_a_handle_target_request; */
2810
2811         /* REVISIT v7a setup should be in a v7a-specific routine */
2812         armv7a_init_arch_info(target, armv7a);
2813         target_register_timer_callback(cortex_a_handle_target_request, 1,
2814                 TARGET_TIMER_TYPE_PERIODIC, target);
2815
2816         return ERROR_OK;
2817 }
2818
2819 static int cortex_a_target_create(struct target *target, Jim_Interp *interp)
2820 {
2821         struct cortex_a_common *cortex_a;
2822         struct adiv5_private_config *pc;
2823
2824         if (target->private_config == NULL)
2825                 return ERROR_FAIL;
2826
2827         pc = (struct adiv5_private_config *)target->private_config;
2828
2829         cortex_a = calloc(1, sizeof(struct cortex_a_common));
2830         if (cortex_a == NULL) {
2831                 LOG_ERROR("Out of memory");
2832                 return ERROR_FAIL;
2833         }
2834         cortex_a->common_magic = CORTEX_A_COMMON_MAGIC;
2835         cortex_a->armv7a_common.is_armv7r = false;
2836         cortex_a->armv7a_common.arm.arm_vfp_version = ARM_VFP_V3;
2837
2838         return cortex_a_init_arch_info(target, cortex_a, pc->dap);
2839 }
2840
2841 static int cortex_r4_target_create(struct target *target, Jim_Interp *interp)
2842 {
2843         struct cortex_a_common *cortex_a;
2844         struct adiv5_private_config *pc;
2845
2846         pc = (struct adiv5_private_config *)target->private_config;
2847         if (adiv5_verify_config(pc) != ERROR_OK)
2848                 return ERROR_FAIL;
2849
2850         cortex_a = calloc(1, sizeof(struct cortex_a_common));
2851         if (cortex_a == NULL) {
2852                 LOG_ERROR("Out of memory");
2853                 return ERROR_FAIL;
2854         }
2855         cortex_a->common_magic = CORTEX_A_COMMON_MAGIC;
2856         cortex_a->armv7a_common.is_armv7r = true;
2857
2858         return cortex_a_init_arch_info(target, cortex_a, pc->dap);
2859 }
2860
2861 static void cortex_a_deinit_target(struct target *target)
2862 {
2863         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
2864         struct armv7a_common *armv7a = &cortex_a->armv7a_common;
2865         struct arm_dpm *dpm = &armv7a->dpm;
2866         uint32_t dscr;
2867         int retval;
2868
2869         if (target_was_examined(target)) {
2870                 /* Disable halt for breakpoint, watchpoint and vector catch */
2871                 retval = mem_ap_read_atomic_u32(armv7a->debug_ap,
2872                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
2873                 if (retval == ERROR_OK)
2874                         mem_ap_write_atomic_u32(armv7a->debug_ap,
2875                                         armv7a->debug_base + CPUDBG_DSCR,
2876                                         dscr & ~DSCR_HALT_DBG_MODE);
2877         }
2878
2879         free(cortex_a->brp_list);
2880         free(dpm->dbp);
2881         free(dpm->dwp);
2882         free(target->private_config);
2883         free(cortex_a);
2884 }
2885
2886 static int cortex_a_mmu(struct target *target, int *enabled)
2887 {
2888         struct armv7a_common *armv7a = target_to_armv7a(target);
2889
2890         if (target->state != TARGET_HALTED) {
2891                 LOG_ERROR("%s: target not halted", __func__);
2892                 return ERROR_TARGET_INVALID;
2893         }
2894
2895         if (armv7a->is_armv7r)
2896                 *enabled = 0;
2897         else
2898                 *enabled = target_to_cortex_a(target)->armv7a_common.armv7a_mmu.mmu_enabled;
2899
2900         return ERROR_OK;
2901 }
2902
2903 static int cortex_a_virt2phys(struct target *target,
2904         target_addr_t virt, target_addr_t *phys)
2905 {
2906         int retval;
2907         int mmu_enabled = 0;
2908
2909         /*
2910          * If the MMU was not enabled at debug entry, there is no
2911          * way of knowing if there was ever a valid configuration
2912          * for it and thus it's not safe to enable it. In this case,
2913          * just return the virtual address as physical.
2914          */
2915         cortex_a_mmu(target, &mmu_enabled);
2916         if (!mmu_enabled) {
2917                 *phys = virt;
2918                 return ERROR_OK;
2919         }
2920
2921         /* mmu must be enable in order to get a correct translation */
2922         retval = cortex_a_mmu_modify(target, 1);
2923         if (retval != ERROR_OK)
2924                 return retval;
2925         return armv7a_mmu_translate_va_pa(target, (uint32_t)virt,
2926                                                     phys, 1);
2927 }
2928
2929 COMMAND_HANDLER(cortex_a_handle_cache_info_command)
2930 {
2931         struct target *target = get_current_target(CMD_CTX);
2932         struct armv7a_common *armv7a = target_to_armv7a(target);
2933
2934         return armv7a_handle_cache_info_command(CMD,
2935                         &armv7a->armv7a_mmu.armv7a_cache);
2936 }
2937
2938
2939 COMMAND_HANDLER(cortex_a_handle_dbginit_command)
2940 {
2941         struct target *target = get_current_target(CMD_CTX);
2942         if (!target_was_examined(target)) {
2943                 LOG_ERROR("target not examined yet");
2944                 return ERROR_FAIL;
2945         }
2946
2947         return cortex_a_init_debug_access(target);
2948 }
2949
2950 COMMAND_HANDLER(handle_cortex_a_mask_interrupts_command)
2951 {
2952         struct target *target = get_current_target(CMD_CTX);
2953         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
2954
2955         static const Jim_Nvp nvp_maskisr_modes[] = {
2956                 { .name = "off", .value = CORTEX_A_ISRMASK_OFF },
2957                 { .name = "on", .value = CORTEX_A_ISRMASK_ON },
2958                 { .name = NULL, .value = -1 },
2959         };
2960         const Jim_Nvp *n;
2961
2962         if (CMD_ARGC > 0) {
2963                 n = Jim_Nvp_name2value_simple(nvp_maskisr_modes, CMD_ARGV[0]);
2964                 if (n->name == NULL) {
2965                         LOG_ERROR("Unknown parameter: %s - should be off or on", CMD_ARGV[0]);
2966                         return ERROR_COMMAND_SYNTAX_ERROR;
2967                 }
2968
2969                 cortex_a->isrmasking_mode = n->value;
2970         }
2971
2972         n = Jim_Nvp_value2name_simple(nvp_maskisr_modes, cortex_a->isrmasking_mode);
2973         command_print(CMD, "cortex_a interrupt mask %s", n->name);
2974
2975         return ERROR_OK;
2976 }
2977
2978 COMMAND_HANDLER(handle_cortex_a_dacrfixup_command)
2979 {
2980         struct target *target = get_current_target(CMD_CTX);
2981         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
2982
2983         static const Jim_Nvp nvp_dacrfixup_modes[] = {
2984                 { .name = "off", .value = CORTEX_A_DACRFIXUP_OFF },
2985                 { .name = "on", .value = CORTEX_A_DACRFIXUP_ON },
2986                 { .name = NULL, .value = -1 },
2987         };
2988         const Jim_Nvp *n;
2989
2990         if (CMD_ARGC > 0) {
2991                 n = Jim_Nvp_name2value_simple(nvp_dacrfixup_modes, CMD_ARGV[0]);
2992                 if (n->name == NULL)
2993                         return ERROR_COMMAND_SYNTAX_ERROR;
2994                 cortex_a->dacrfixup_mode = n->value;
2995
2996         }
2997
2998         n = Jim_Nvp_value2name_simple(nvp_dacrfixup_modes, cortex_a->dacrfixup_mode);
2999         command_print(CMD, "cortex_a domain access control fixup %s", n->name);
3000
3001         return ERROR_OK;
3002 }
3003
3004 static const struct command_registration cortex_a_exec_command_handlers[] = {
3005         {
3006                 .name = "cache_info",
3007                 .handler = cortex_a_handle_cache_info_command,
3008                 .mode = COMMAND_EXEC,
3009                 .help = "display information about target caches",
3010                 .usage = "",
3011         },
3012         {
3013                 .name = "dbginit",
3014                 .handler = cortex_a_handle_dbginit_command,
3015                 .mode = COMMAND_EXEC,
3016                 .help = "Initialize core debug",
3017                 .usage = "",
3018         },
3019         {
3020                 .name = "maskisr",
3021                 .handler = handle_cortex_a_mask_interrupts_command,
3022                 .mode = COMMAND_ANY,
3023                 .help = "mask cortex_a interrupts",
3024                 .usage = "['on'|'off']",
3025         },
3026         {
3027                 .name = "dacrfixup",
3028                 .handler = handle_cortex_a_dacrfixup_command,
3029                 .mode = COMMAND_ANY,
3030                 .help = "set domain access control (DACR) to all-manager "
3031                         "on memory access",
3032                 .usage = "['on'|'off']",
3033         },
3034         {
3035                 .chain = armv7a_mmu_command_handlers,
3036         },
3037         {
3038                 .chain = smp_command_handlers,
3039         },
3040
3041         COMMAND_REGISTRATION_DONE
3042 };
3043 static const struct command_registration cortex_a_command_handlers[] = {
3044         {
3045                 .chain = arm_command_handlers,
3046         },
3047         {
3048                 .chain = armv7a_command_handlers,
3049         },
3050         {
3051                 .name = "cortex_a",
3052                 .mode = COMMAND_ANY,
3053                 .help = "Cortex-A command group",
3054                 .usage = "",
3055                 .chain = cortex_a_exec_command_handlers,
3056         },
3057         COMMAND_REGISTRATION_DONE
3058 };
3059
3060 struct target_type cortexa_target = {
3061         .name = "cortex_a",
3062         .deprecated_name = "cortex_a8",
3063
3064         .poll = cortex_a_poll,
3065         .arch_state = armv7a_arch_state,
3066
3067         .halt = cortex_a_halt,
3068         .resume = cortex_a_resume,
3069         .step = cortex_a_step,
3070
3071         .assert_reset = cortex_a_assert_reset,
3072         .deassert_reset = cortex_a_deassert_reset,
3073
3074         /* REVISIT allow exporting VFP3 registers ... */
3075         .get_gdb_arch = arm_get_gdb_arch,
3076         .get_gdb_reg_list = arm_get_gdb_reg_list,
3077
3078         .read_memory = cortex_a_read_memory,
3079         .write_memory = cortex_a_write_memory,
3080
3081         .read_buffer = cortex_a_read_buffer,
3082         .write_buffer = cortex_a_write_buffer,
3083
3084         .checksum_memory = arm_checksum_memory,
3085         .blank_check_memory = arm_blank_check_memory,
3086
3087         .run_algorithm = armv4_5_run_algorithm,
3088
3089         .add_breakpoint = cortex_a_add_breakpoint,
3090         .add_context_breakpoint = cortex_a_add_context_breakpoint,
3091         .add_hybrid_breakpoint = cortex_a_add_hybrid_breakpoint,
3092         .remove_breakpoint = cortex_a_remove_breakpoint,
3093         .add_watchpoint = NULL,
3094         .remove_watchpoint = NULL,
3095
3096         .commands = cortex_a_command_handlers,
3097         .target_create = cortex_a_target_create,
3098         .target_jim_configure = adiv5_jim_configure,
3099         .init_target = cortex_a_init_target,
3100         .examine = cortex_a_examine,
3101         .deinit_target = cortex_a_deinit_target,
3102
3103         .read_phys_memory = cortex_a_read_phys_memory,
3104         .write_phys_memory = cortex_a_write_phys_memory,
3105         .mmu = cortex_a_mmu,
3106         .virt2phys = cortex_a_virt2phys,
3107 };
3108
3109 static const struct command_registration cortex_r4_exec_command_handlers[] = {
3110         {
3111                 .name = "dbginit",
3112                 .handler = cortex_a_handle_dbginit_command,
3113                 .mode = COMMAND_EXEC,
3114                 .help = "Initialize core debug",
3115                 .usage = "",
3116         },
3117         {
3118                 .name = "maskisr",
3119                 .handler = handle_cortex_a_mask_interrupts_command,
3120                 .mode = COMMAND_EXEC,
3121                 .help = "mask cortex_r4 interrupts",
3122                 .usage = "['on'|'off']",
3123         },
3124
3125         COMMAND_REGISTRATION_DONE
3126 };
3127 static const struct command_registration cortex_r4_command_handlers[] = {
3128         {
3129                 .chain = arm_command_handlers,
3130         },
3131         {
3132                 .name = "cortex_r4",
3133                 .mode = COMMAND_ANY,
3134                 .help = "Cortex-R4 command group",
3135                 .usage = "",
3136                 .chain = cortex_r4_exec_command_handlers,
3137         },
3138         COMMAND_REGISTRATION_DONE
3139 };
3140
3141 struct target_type cortexr4_target = {
3142         .name = "cortex_r4",
3143
3144         .poll = cortex_a_poll,
3145         .arch_state = armv7a_arch_state,
3146
3147         .halt = cortex_a_halt,
3148         .resume = cortex_a_resume,
3149         .step = cortex_a_step,
3150
3151         .assert_reset = cortex_a_assert_reset,
3152         .deassert_reset = cortex_a_deassert_reset,
3153
3154         /* REVISIT allow exporting VFP3 registers ... */
3155         .get_gdb_arch = arm_get_gdb_arch,
3156         .get_gdb_reg_list = arm_get_gdb_reg_list,
3157
3158         .read_memory = cortex_a_read_phys_memory,
3159         .write_memory = cortex_a_write_phys_memory,
3160
3161         .checksum_memory = arm_checksum_memory,
3162         .blank_check_memory = arm_blank_check_memory,
3163
3164         .run_algorithm = armv4_5_run_algorithm,
3165
3166         .add_breakpoint = cortex_a_add_breakpoint,
3167         .add_context_breakpoint = cortex_a_add_context_breakpoint,
3168         .add_hybrid_breakpoint = cortex_a_add_hybrid_breakpoint,
3169         .remove_breakpoint = cortex_a_remove_breakpoint,
3170         .add_watchpoint = NULL,
3171         .remove_watchpoint = NULL,
3172
3173         .commands = cortex_r4_command_handlers,
3174         .target_create = cortex_r4_target_create,
3175         .target_jim_configure = adiv5_jim_configure,
3176         .init_target = cortex_a_init_target,
3177         .examine = cortex_a_examine,
3178         .deinit_target = cortex_a_deinit_target,
3179 };