git.gag.com Git - fw/openocd/blob - src/target/cortex_a8.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   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  *   This program is free software; you can redistribute it and/or modify  *
  15  *   it under the terms of the GNU General Public License as published by  *
  16  *   the Free Software Foundation; either version 2 of the License, or     *
  17  *   (at your option) any later version.                                   *
  18  *                                                                         *
  19  *   This program is distributed in the hope that it will be useful,       *
  20  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  21  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  22  *   GNU General Public License for more details.                          *
  23  *                                                                         *
  24  *   You should have received a copy of the GNU General Public License     *
  25  *   along with this program; if not, write to the                         *
  26  *   Free Software Foundation, Inc.,                                       *
  27  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  28  *                                                                         *
  29  *   Cortex-A8(tm) TRM, ARM DDI 0344H                                      *
  30  *                                                                         *
  31  ***************************************************************************/
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include "breakpoints.h"
  37 #include "cortex_a8.h"
  38 #include "register.h"
  39 #include "target_request.h"
  40 #include "target_type.h"
  41
  42 static int cortex_a8_poll(struct target *target);
  43 static int cortex_a8_debug_entry(struct target *target);
  44 static int cortex_a8_restore_context(struct target *target, bool bpwp);
  45 static int cortex_a8_set_breakpoint(struct target *target,
  46                 struct breakpoint *breakpoint, uint8_t matchmode);
  47 static int cortex_a8_unset_breakpoint(struct target *target,
  48                 struct breakpoint *breakpoint);
  49 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
  50                 uint32_t *value, int regnum);
  51 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
  52                 uint32_t value, int regnum);
  53 /*
  54  * FIXME do topology discovery using the ROM; don't
  55  * assume this is an OMAP3.
  56  */
  57 #define swjdp_memoryap 0
  58 #define swjdp_debugap 1
  59 #define OMAP3530_DEBUG_BASE 0x54011000
  60
  61 /*
  62  * Cortex-A8 Basic debug access, very low level assumes state is saved
  63  */
  64 static int cortex_a8_init_debug_access(struct target *target)
  65 {
  66         struct armv7a_common *armv7a = target_to_armv7a(target);
  67         struct swjdp_common *swjdp = &armv7a->swjdp_info;
  68
  69         int retval;
  70         uint32_t dummy;
  71
  72         LOG_DEBUG(" ");
  73
  74         /* Unlocking the debug registers for modification */
  75         /* The debugport might be uninitialised so try twice */
  76         retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
  77         if (retval != ERROR_OK)
  78                 mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
  79         /* Clear Sticky Power Down status Bit in PRSR to enable access to
  80            the registers in the Core Power Domain */
  81         retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_PRSR, &dummy);
  82         /* Enabling of instruction execution in debug mode is done in debug_entry code */
  83
  84         /* Resync breakpoint registers */
  85
  86         /* Since this is likley called from init or reset, update targtet state information*/
  87         cortex_a8_poll(target);
  88
  89         return retval;
  90 }
  91
  92 /* To reduce needless round-trips, pass in a pointer to the current
  93  * DSCR value.  Initialize it to zero if you just need to know the
  94  * value on return from this function; or DSCR_INSTR_COMP if you
  95  * happen to know that no instruction is pending.
  96  */
  97 static int cortex_a8_exec_opcode(struct target *target,
  98                 uint32_t opcode, uint32_t *dscr_p)
  99 {
 100         uint32_t dscr;
 101         int retval;
 102         struct armv7a_common *armv7a = target_to_armv7a(target);
 103         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 104
 105         dscr = dscr_p ? *dscr_p : 0;
 106
 107         LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
 108
 109         /* Wait for InstrCompl bit to be set */
 110         while ((dscr & DSCR_INSTR_COMP) == 0)
 111         {
 112                 retval = mem_ap_read_atomic_u32(swjdp,
 113                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
 114                 if (retval != ERROR_OK)
 115                 {
 116                         LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
 117                         return retval;
 118                 }
 119         }
 120
 121         mem_ap_write_u32(swjdp, armv7a->debug_base + CPUDBG_ITR, opcode);
 122
 123         do
 124         {
 125                 retval = mem_ap_read_atomic_u32(swjdp,
 126                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
 127                 if (retval != ERROR_OK)
 128                 {
 129                         LOG_ERROR("Could not read DSCR register");
 130                         return retval;
 131                 }
 132         }
 133         while ((dscr & DSCR_INSTR_COMP) == 0); /* Wait for InstrCompl bit to be set */
 134
 135         if (dscr_p)
 136                 *dscr_p = dscr;
 137
 138         return retval;
 139 }
 140
 141 /**************************************************************************
 142 Read core register with very few exec_opcode, fast but needs work_area.
 143 This can cause problems with MMU active.
 144 **************************************************************************/
 145 static int cortex_a8_read_regs_through_mem(struct target *target, uint32_t address,
 146                 uint32_t * regfile)
 147 {
 148         int retval = ERROR_OK;
 149         struct armv7a_common *armv7a = target_to_armv7a(target);
 150         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 151
 152         cortex_a8_dap_read_coreregister_u32(target, regfile, 0);
 153         cortex_a8_dap_write_coreregister_u32(target, address, 0);
 154         cortex_a8_exec_opcode(target, ARMV4_5_STMIA(0, 0xFFFE, 0, 0), NULL);
 155         dap_ap_select(swjdp, swjdp_memoryap);
 156         mem_ap_read_buf_u32(swjdp, (uint8_t *)(&regfile[1]), 4*15, address);
 157         dap_ap_select(swjdp, swjdp_debugap);
 158
 159         return retval;
 160 }
 161
 162 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
 163                 uint32_t *value, int regnum)
 164 {
 165         int retval = ERROR_OK;
 166         uint8_t reg = regnum&0xFF;
 167         uint32_t dscr = 0;
 168         struct armv7a_common *armv7a = target_to_armv7a(target);
 169         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 170
 171         if (reg > 17)
 172                 return retval;
 173
 174         if (reg < 15)
 175         {
 176                 /* Rn to DCCTX, "MCR p14, 0, Rn, c0, c5, 0"  0xEE00nE15 */
 177                 cortex_a8_exec_opcode(target,
 178                                 ARMV4_5_MCR(14, 0, reg, 0, 5, 0),
 179                                 &dscr);
 180         }
 181         else if (reg == 15)
 182         {
 183                 /* "MOV r0, r15"; then move r0 to DCCTX */
 184                 cortex_a8_exec_opcode(target, 0xE1A0000F, &dscr);
 185                 cortex_a8_exec_opcode(target,
 186                                 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
 187                                 &dscr);
 188         }
 189         else
 190         {
 191                 /* "MRS r0, CPSR" or "MRS r0, SPSR"
 192                  * then move r0 to DCCTX
 193                  */
 194                 cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, reg & 1), &dscr);
 195                 cortex_a8_exec_opcode(target,
 196                                 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
 197                                 &dscr);
 198         }
 199
 200         /* Wait for DTRRXfull then read DTRRTX */
 201         while ((dscr & DSCR_DTR_TX_FULL) == 0)
 202         {
 203                 retval = mem_ap_read_atomic_u32(swjdp,
 204                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
 205         }
 206
 207         retval = mem_ap_read_atomic_u32(swjdp,
 208                         armv7a->debug_base + CPUDBG_DTRTX, value);
 209         LOG_DEBUG("read DCC 0x%08" PRIx32, *value);
 210
 211         return retval;
 212 }
 213
 214 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
 215                 uint32_t value, int regnum)
 216 {
 217         int retval = ERROR_OK;
 218         uint8_t Rd = regnum&0xFF;
 219         uint32_t dscr;
 220         struct armv7a_common *armv7a = target_to_armv7a(target);
 221         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 222
 223         LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
 224
 225         /* Check that DCCRX is not full */
 226         retval = mem_ap_read_atomic_u32(swjdp,
 227                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
 228         if (dscr & DSCR_DTR_RX_FULL)
 229         {
 230                 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
 231                 /* Clear DCCRX with MCR(p14, 0, Rd, c0, c5, 0), opcode  0xEE000E15 */
 232                 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 233                                 &dscr);
 234         }
 235
 236         if (Rd > 17)
 237                 return retval;
 238
 239         /* Write DTRRX ... sets DSCR.DTRRXfull but exec_opcode() won't care */
 240         LOG_DEBUG("write DCC 0x%08" PRIx32, value);
 241         retval = mem_ap_write_u32(swjdp,
 242                         armv7a->debug_base + CPUDBG_DTRRX, value);
 243
 244         if (Rd < 15)
 245         {
 246                 /* DCCRX to Rn, "MCR p14, 0, Rn, c0, c5, 0", 0xEE00nE15 */
 247                 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, Rd, 0, 5, 0),
 248                                 &dscr);
 249         }
 250         else if (Rd == 15)
 251         {
 252                 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
 253                  * then "mov r15, r0"
 254                  */
 255                 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 256                                 &dscr);
 257                 cortex_a8_exec_opcode(target, 0xE1A0F000, &dscr);
 258         }
 259         else
 260         {
 261                 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
 262                  * then "MSR CPSR_cxsf, r0" or "MSR SPSR_cxsf, r0" (all fields)
 263                  */
 264                 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 265                                 &dscr);
 266                 cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, Rd & 1),
 267                                 &dscr);
 268
 269                 /* "Prefetch flush" after modifying execution status in CPSR */
 270                 if (Rd == 16)
 271                         cortex_a8_exec_opcode(target,
 272                                         ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
 273                                         &dscr);
 274         }
 275
 276         return retval;
 277 }
 278
 279 /* Write to memory mapped registers directly with no cache or mmu handling */
 280 static int cortex_a8_dap_write_memap_register_u32(struct target *target, uint32_t address, uint32_t value)
 281 {
 282         int retval;
 283         struct armv7a_common *armv7a = target_to_armv7a(target);
 284         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 285
 286         retval = mem_ap_write_atomic_u32(swjdp, address, value);
 287
 288         return retval;
 289 }
 290
 291 /*
 292  * Cortex-A8 implementation of Debug Programmer's Model
 293  *
 294  * NOTE the invariant:  these routines return with DSCR_INSTR_COMP set,
 295  * so there's no need to poll for it before executing an instruction.
 296  *
 297  * NOTE that in several of these cases the "stall" mode might be useful.
 298  * It'd let us queue a few operations together... prepare/finish might
 299  * be the places to enable/disable that mode.
 300  */
 301
 302 static inline struct cortex_a8_common *dpm_to_a8(struct arm_dpm *dpm)
 303 {
 304         return container_of(dpm, struct cortex_a8_common, armv7a_common.dpm);
 305 }
 306
 307 static int cortex_a8_write_dcc(struct cortex_a8_common *a8, uint32_t data)
 308 {
 309         LOG_DEBUG("write DCC 0x%08" PRIx32, data);
 310         return mem_ap_write_u32(&a8->armv7a_common.swjdp_info,
 311                         a8->armv7a_common.debug_base + CPUDBG_DTRRX, data);
 312 }
 313
 314 static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data,
 315                 uint32_t *dscr_p)
 316 {
 317         struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info;
 318         uint32_t dscr = DSCR_INSTR_COMP;
 319         int retval;
 320
 321         if (dscr_p)
 322                 dscr = *dscr_p;
 323
 324         /* Wait for DTRRXfull */
 325         while ((dscr & DSCR_DTR_TX_FULL) == 0) {
 326                 retval = mem_ap_read_atomic_u32(swjdp,
 327                                 a8->armv7a_common.debug_base + CPUDBG_DSCR,
 328                                 &dscr);
 329         }
 330
 331         retval = mem_ap_read_atomic_u32(swjdp,
 332                         a8->armv7a_common.debug_base + CPUDBG_DTRTX, data);
 333         //LOG_DEBUG("read DCC 0x%08" PRIx32, *data);
 334
 335         if (dscr_p)
 336                 *dscr_p = dscr;
 337
 338         return retval;
 339 }
 340
 341 static int cortex_a8_dpm_prepare(struct arm_dpm *dpm)
 342 {
 343         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 344         struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info;
 345         uint32_t dscr;
 346         int retval;
 347
 348         /* set up invariant:  INSTR_COMP is set after ever DPM operation */
 349         do {
 350                 retval = mem_ap_read_atomic_u32(swjdp,
 351                                 a8->armv7a_common.debug_base + CPUDBG_DSCR,
 352                                 &dscr);
 353         } while ((dscr & DSCR_INSTR_COMP) == 0);
 354
 355         /* this "should never happen" ... */
 356         if (dscr & DSCR_DTR_RX_FULL) {
 357                 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
 358                 /* Clear DCCRX */
 359                 retval = cortex_a8_exec_opcode(
 360                                 a8->armv7a_common.armv4_5_common.target,
 361                                 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 362                                 &dscr);
 363         }
 364
 365         return retval;
 366 }
 367
 368 static int cortex_a8_dpm_finish(struct arm_dpm *dpm)
 369 {
 370         /* REVISIT what could be done here? */
 371         return ERROR_OK;
 372 }
 373
 374 static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm,
 375                 uint32_t opcode, uint32_t data)
 376 {
 377         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 378         int retval;
 379         uint32_t dscr = DSCR_INSTR_COMP;
 380
 381         retval = cortex_a8_write_dcc(a8, data);
 382
 383         return cortex_a8_exec_opcode(
 384                         a8->armv7a_common.armv4_5_common.target,
 385                         opcode,
 386                         &dscr);
 387 }
 388
 389 static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
 390                 uint32_t opcode, uint32_t data)
 391 {
 392         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 393         uint32_t dscr = DSCR_INSTR_COMP;
 394         int retval;
 395
 396         retval = cortex_a8_write_dcc(a8, data);
 397
 398         /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 */
 399         retval = cortex_a8_exec_opcode(
 400                         a8->armv7a_common.armv4_5_common.target,
 401                         ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
 402                         &dscr);
 403
 404         /* then the opcode, taking data from R0 */
 405         retval = cortex_a8_exec_opcode(
 406                         a8->armv7a_common.armv4_5_common.target,
 407                         opcode,
 408                         &dscr);
 409
 410         return retval;
 411 }
 412
 413 static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm)
 414 {
 415         struct target *target = dpm->arm->target;
 416         uint32_t dscr = DSCR_INSTR_COMP;
 417
 418         /* "Prefetch flush" after modifying execution status in CPSR */
 419         return cortex_a8_exec_opcode(target,
 420                         ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
 421                         &dscr);
 422 }
 423
 424 static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm,
 425                 uint32_t opcode, uint32_t *data)
 426 {
 427         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 428         int retval;
 429         uint32_t dscr = DSCR_INSTR_COMP;
 430
 431         /* the opcode, writing data to DCC */
 432         retval = cortex_a8_exec_opcode(
 433                         a8->armv7a_common.armv4_5_common.target,
 434                         opcode,
 435                         &dscr);
 436
 437         return cortex_a8_read_dcc(a8, data, &dscr);
 438 }
 439
 440
 441 static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm,
 442                 uint32_t opcode, uint32_t *data)
 443 {
 444         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 445         uint32_t dscr = DSCR_INSTR_COMP;
 446         int retval;
 447
 448         /* the opcode, writing data to R0 */
 449         retval = cortex_a8_exec_opcode(
 450                         a8->armv7a_common.armv4_5_common.target,
 451                         opcode,
 452                         &dscr);
 453
 454         /* write R0 to DCC */
 455         retval = cortex_a8_exec_opcode(
 456                         a8->armv7a_common.armv4_5_common.target,
 457                         ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
 458                         &dscr);
 459
 460         return cortex_a8_read_dcc(a8, data, &dscr);
 461 }
 462
 463 static int cortex_a8_bpwp_enable(struct arm_dpm *dpm, unsigned index,
 464                 uint32_t addr, uint32_t control)
 465 {
 466         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 467         uint32_t vr = a8->armv7a_common.debug_base;
 468         uint32_t cr = a8->armv7a_common.debug_base;
 469         int retval;
 470
 471         switch (index) {
 472         case 0 ... 15:          /* breakpoints */
 473                 vr += CPUDBG_BVR_BASE;
 474                 cr += CPUDBG_BCR_BASE;
 475                 break;
 476         case 16 ... 31:         /* watchpoints */
 477                 vr += CPUDBG_WVR_BASE;
 478                 cr += CPUDBG_WCR_BASE;
 479                 index -= 16;
 480                 break;
 481         default:
 482                 return ERROR_FAIL;
 483         }
 484         vr += 4 * index;
 485         cr += 4 * index;
 486
 487         LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
 488                         (unsigned) vr, (unsigned) cr);
 489
 490         retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
 491                         vr, addr);
 492         if (retval != ERROR_OK)
 493                 return retval;
 494         retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
 495                         cr, control);
 496         return retval;
 497 }
 498
 499 static int cortex_a8_bpwp_disable(struct arm_dpm *dpm, unsigned index)
 500 {
 501         struct cortex_a8_common *a8 = dpm_to_a8(dpm);
 502         uint32_t cr;
 503
 504         switch (index) {
 505         case 0 ... 15:
 506                 cr = a8->armv7a_common.debug_base + CPUDBG_BCR_BASE;
 507                 break;
 508         case 16 ... 31:
 509                 cr = a8->armv7a_common.debug_base + CPUDBG_WCR_BASE;
 510                 index -= 16;
 511                 break;
 512         default:
 513                 return ERROR_FAIL;
 514         }
 515         cr += 4 * index;
 516
 517         LOG_DEBUG("A8: bpwp disable, cr %08x", (unsigned) cr);
 518
 519         /* clear control register */
 520         return cortex_a8_dap_write_memap_register_u32(dpm->arm->target, cr, 0);
 521 }
 522
 523 static int cortex_a8_dpm_setup(struct cortex_a8_common *a8, uint32_t didr)
 524 {
 525         struct arm_dpm *dpm = &a8->armv7a_common.dpm;
 526         int retval;
 527
 528         dpm->arm = &a8->armv7a_common.armv4_5_common;
 529         dpm->didr = didr;
 530
 531         dpm->prepare = cortex_a8_dpm_prepare;
 532         dpm->finish = cortex_a8_dpm_finish;
 533
 534         dpm->instr_write_data_dcc = cortex_a8_instr_write_data_dcc;
 535         dpm->instr_write_data_r0 = cortex_a8_instr_write_data_r0;
 536         dpm->instr_cpsr_sync = cortex_a8_instr_cpsr_sync;
 537
 538         dpm->instr_read_data_dcc = cortex_a8_instr_read_data_dcc;
 539         dpm->instr_read_data_r0 = cortex_a8_instr_read_data_r0;
 540
 541         dpm->bpwp_enable = cortex_a8_bpwp_enable;
 542         dpm->bpwp_disable = cortex_a8_bpwp_disable;
 543
 544         retval = arm_dpm_setup(dpm);
 545         if (retval == ERROR_OK)
 546                 retval = arm_dpm_initialize(dpm);
 547
 548         return retval;
 549 }
 550
 551
 552 /*
 553  * Cortex-A8 Run control
 554  */
 555
 556 static int cortex_a8_poll(struct target *target)
 557 {
 558         int retval = ERROR_OK;
 559         uint32_t dscr;
 560         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
 561         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
 562         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 563         enum target_state prev_target_state = target->state;
 564         uint8_t saved_apsel = dap_ap_get_select(swjdp);
 565
 566         dap_ap_select(swjdp, swjdp_debugap);
 567         retval = mem_ap_read_atomic_u32(swjdp,
 568                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 569         if (retval != ERROR_OK)
 570         {
 571                 dap_ap_select(swjdp, saved_apsel);
 572                 return retval;
 573         }
 574         cortex_a8->cpudbg_dscr = dscr;
 575
 576         if ((dscr & 0x3) == 0x3)
 577         {
 578                 if (prev_target_state != TARGET_HALTED)
 579                 {
 580                         /* We have a halting debug event */
 581                         LOG_DEBUG("Target halted");
 582                         target->state = TARGET_HALTED;
 583                         if ((prev_target_state == TARGET_RUNNING)
 584                                         || (prev_target_state == TARGET_RESET))
 585                         {
 586                                 retval = cortex_a8_debug_entry(target);
 587                                 if (retval != ERROR_OK)
 588                                         return retval;
 589
 590                                 target_call_event_callbacks(target,
 591                                                 TARGET_EVENT_HALTED);
 592                         }
 593                         if (prev_target_state == TARGET_DEBUG_RUNNING)
 594                         {
 595                                 LOG_DEBUG(" ");
 596
 597                                 retval = cortex_a8_debug_entry(target);
 598                                 if (retval != ERROR_OK)
 599                                         return retval;
 600
 601                                 target_call_event_callbacks(target,
 602                                                 TARGET_EVENT_DEBUG_HALTED);
 603                         }
 604                 }
 605         }
 606         else if ((dscr & 0x3) == 0x2)
 607         {
 608                 target->state = TARGET_RUNNING;
 609         }
 610         else
 611         {
 612                 LOG_DEBUG("Unknown target state dscr = 0x%08" PRIx32, dscr);
 613                 target->state = TARGET_UNKNOWN;
 614         }
 615
 616         dap_ap_select(swjdp, saved_apsel);
 617
 618         return retval;
 619 }
 620
 621 static int cortex_a8_halt(struct target *target)
 622 {
 623         int retval = ERROR_OK;
 624         uint32_t dscr;
 625         struct armv7a_common *armv7a = target_to_armv7a(target);
 626         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 627         uint8_t saved_apsel = dap_ap_get_select(swjdp);
 628         dap_ap_select(swjdp, swjdp_debugap);
 629
 630         /*
 631          * Tell the core to be halted by writing DRCR with 0x1
 632          * and then wait for the core to be halted.
 633          */
 634         retval = mem_ap_write_atomic_u32(swjdp,
 635                         armv7a->debug_base + CPUDBG_DRCR, 0x1);
 636
 637         /*
 638          * enter halting debug mode
 639          */
 640         mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr);
 641         retval = mem_ap_write_atomic_u32(swjdp,
 642                 armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
 643
 644         if (retval != ERROR_OK)
 645                 goto out;
 646
 647         do {
 648                 mem_ap_read_atomic_u32(swjdp,
 649                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 650         } while ((dscr & DSCR_CORE_HALTED) == 0);
 651
 652         target->debug_reason = DBG_REASON_DBGRQ;
 653
 654 out:
 655         dap_ap_select(swjdp, saved_apsel);
 656         return retval;
 657 }
 658
 659 static int cortex_a8_resume(struct target *target, int current,
 660                 uint32_t address, int handle_breakpoints, int debug_execution)
 661 {
 662         struct armv7a_common *armv7a = target_to_armv7a(target);
 663         struct arm *armv4_5 = &armv7a->armv4_5_common;
 664         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 665
 666 //      struct breakpoint *breakpoint = NULL;
 667         uint32_t resume_pc, dscr;
 668
 669         uint8_t saved_apsel = dap_ap_get_select(swjdp);
 670         dap_ap_select(swjdp, swjdp_debugap);
 671
 672         if (!debug_execution)
 673                 target_free_all_working_areas(target);
 674
 675 #if 0
 676         if (debug_execution)
 677         {
 678                 /* Disable interrupts */
 679                 /* We disable interrupts in the PRIMASK register instead of
 680                  * masking with C_MASKINTS,
 681                  * This is probably the same issue as Cortex-M3 Errata 377493:
 682                  * C_MASKINTS in parallel with disabled interrupts can cause
 683                  * local faults to not be taken. */
 684                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 685                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
 686                 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = 1;
 687
 688                 /* Make sure we are in Thumb mode */
 689                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 690                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1 << 24));
 691                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = 1;
 692                 armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = 1;
 693         }
 694 #endif
 695
 696         /* current = 1: continue on current pc, otherwise continue at <address> */
 697         resume_pc = buf_get_u32(
 698                         armv4_5->core_cache->reg_list[15].value,
 699                         0, 32);
 700         if (!current)
 701                 resume_pc = address;
 702
 703         /* Make sure that the Armv7 gdb thumb fixups does not
 704          * kill the return address
 705          */
 706         switch (armv4_5->core_state)
 707         {
 708         case ARMV4_5_STATE_ARM:
 709                 resume_pc &= 0xFFFFFFFC;
 710                 break;
 711         case ARMV4_5_STATE_THUMB:
 712         case ARM_STATE_THUMB_EE:
 713                 /* When the return address is loaded into PC
 714                  * bit 0 must be 1 to stay in Thumb state
 715                  */
 716                 resume_pc |= 0x1;
 717                 break;
 718         case ARMV4_5_STATE_JAZELLE:
 719                 LOG_ERROR("How do I resume into Jazelle state??");
 720                 return ERROR_FAIL;
 721         }
 722         LOG_DEBUG("resume pc = 0x%08" PRIx32, resume_pc);
 723         buf_set_u32(armv4_5->core_cache->reg_list[15].value,
 724                         0, 32, resume_pc);
 725         armv4_5->core_cache->reg_list[15].dirty = 1;
 726         armv4_5->core_cache->reg_list[15].valid = 1;
 727
 728         cortex_a8_restore_context(target, handle_breakpoints);
 729
 730 #if 0
 731         /* the front-end may request us not to handle breakpoints */
 732         if (handle_breakpoints)
 733         {
 734                 /* Single step past breakpoint at current address */
 735                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 736                 {
 737                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 738                         cortex_m3_unset_breakpoint(target, breakpoint);
 739                         cortex_m3_single_step_core(target);
 740                         cortex_m3_set_breakpoint(target, breakpoint);
 741                 }
 742         }
 743
 744 #endif
 745         /* Restart core and wait for it to be started
 746          * NOTE: this clears DSCR_ITR_EN and other bits.
 747          *
 748          * REVISIT: for single stepping, we probably want to
 749          * disable IRQs by default, with optional override...
 750          */
 751         mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR, 0x2);
 752
 753         do {
 754                 mem_ap_read_atomic_u32(swjdp,
 755                         armv7a->debug_base + CPUDBG_DSCR, &dscr);
 756         } while ((dscr & DSCR_CORE_RESTARTED) == 0);
 757
 758         target->debug_reason = DBG_REASON_NOTHALTED;
 759         target->state = TARGET_RUNNING;
 760
 761         /* registers are now invalid */
 762         register_cache_invalidate(armv4_5->core_cache);
 763
 764         if (!debug_execution)
 765         {
 766                 target->state = TARGET_RUNNING;
 767                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 768                 LOG_DEBUG("target resumed at 0x%" PRIx32, resume_pc);
 769         }
 770         else
 771         {
 772                 target->state = TARGET_DEBUG_RUNNING;
 773                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 774                 LOG_DEBUG("target debug resumed at 0x%" PRIx32, resume_pc);
 775         }
 776
 777         dap_ap_select(swjdp, saved_apsel);
 778
 779         return ERROR_OK;
 780 }
 781
 782 static int cortex_a8_debug_entry(struct target *target)
 783 {
 784         int i;
 785         uint32_t regfile[16], wfar, cpsr, dscr;
 786         int retval = ERROR_OK;
 787         struct working_area *regfile_working_area = NULL;
 788         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
 789         struct armv7a_common *armv7a = target_to_armv7a(target);
 790         struct arm *armv4_5 = &armv7a->armv4_5_common;
 791         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 792         struct reg *reg;
 793
 794         LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
 795
 796         mem_ap_read_atomic_u32(swjdp,
 797                                 armv7a->debug_base + CPUDBG_DSCR, &dscr);
 798
 799         /* REVISIT see A8 TRM 12.11.4 steps 2..3 -- make sure that any
 800          * imprecise data aborts get discarded by issuing a Data
 801          * Synchronization Barrier:  ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
 802          */
 803
 804         /* Enable the ITR execution once we are in debug mode */
 805         dscr |= DSCR_ITR_EN;
 806         retval = mem_ap_write_atomic_u32(swjdp,
 807                         armv7a->debug_base + CPUDBG_DSCR, dscr);
 808
 809         /* Examine debug reason */
 810         switch (DSCR_ENTRY(cortex_a8->cpudbg_dscr))
 811         {
 812                 case 0:         /* DRCR[0] write */
 813                 case 4:         /* EDBGRQ */
 814                         target->debug_reason = DBG_REASON_DBGRQ;
 815                         break;
 816                 case 1:         /* HW breakpoint */
 817                 case 3:         /* SW BKPT */
 818                 case 5:         /* vector catch */
 819                         target->debug_reason = DBG_REASON_BREAKPOINT;
 820                         break;
 821                 case 2:         /* asynch watchpoint */
 822                 case 10:        /* precise watchpoint */
 823                         target->debug_reason = DBG_REASON_WATCHPOINT;
 824
 825                         /* save address of faulting instruction */
 826                         retval = mem_ap_read_atomic_u32(swjdp,
 827                                         armv7a->debug_base + CPUDBG_WFAR,
 828                                         &wfar);
 829                         arm_dpm_report_wfar(&armv7a->dpm, wfar);
 830                         break;
 831                 default:
 832                         target->debug_reason = DBG_REASON_UNDEFINED;
 833                         break;
 834         }
 835
 836         /* REVISIT fast_reg_read is never set ... */
 837
 838         /* Examine target state and mode */
 839         if (cortex_a8->fast_reg_read)
 840                 target_alloc_working_area(target, 64, &regfile_working_area);
 841
 842         /* First load register acessible through core debug port*/
 843         if (!regfile_working_area)
 844         {
 845                 retval = arm_dpm_read_current_registers(&armv7a->dpm);
 846         }
 847         else
 848         {
 849                 dap_ap_select(swjdp, swjdp_memoryap);
 850                 cortex_a8_read_regs_through_mem(target,
 851                                 regfile_working_area->address, regfile);
 852                 dap_ap_select(swjdp, swjdp_memoryap);
 853                 target_free_working_area(target, regfile_working_area);
 854
 855                 /* read Current PSR */
 856                 cortex_a8_dap_read_coreregister_u32(target, &cpsr, 16);
 857                 dap_ap_select(swjdp, swjdp_debugap);
 858                 LOG_DEBUG("cpsr: %8.8" PRIx32, cpsr);
 859
 860                 arm_set_cpsr(armv4_5, cpsr);
 861
 862                 /* update cache */
 863                 for (i = 0; i <= ARM_PC; i++)
 864                 {
 865                         reg = arm_reg_current(armv4_5, i);
 866
 867                         buf_set_u32(reg->value, 0, 32, regfile[i]);
 868                         reg->valid = 1;
 869                         reg->dirty = 0;
 870                 }
 871
 872                 /* Fixup PC Resume Address */
 873                 if (cpsr & (1 << 5))
 874                 {
 875                         // T bit set for Thumb or ThumbEE state
 876                         regfile[ARM_PC] -= 4;
 877                 }
 878                 else
 879                 {
 880                         // ARM state
 881                         regfile[ARM_PC] -= 8;
 882                 }
 883
 884                 reg = armv4_5->core_cache->reg_list + 15;
 885                 buf_set_u32(reg->value, 0, 32, regfile[ARM_PC]);
 886                 reg->dirty = reg->valid;
 887         }
 888
 889 #if 0
 890 /* TODO, Move this */
 891         uint32_t cp15_control_register, cp15_cacr, cp15_nacr;
 892         cortex_a8_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
 893         LOG_DEBUG("cp15_control_register = 0x%08x", cp15_control_register);
 894
 895         cortex_a8_read_cp(target, &cp15_cacr, 15, 0, 1, 0, 2);
 896         LOG_DEBUG("cp15 Coprocessor Access Control Register = 0x%08x", cp15_cacr);
 897
 898         cortex_a8_read_cp(target, &cp15_nacr, 15, 0, 1, 1, 2);
 899         LOG_DEBUG("cp15 Nonsecure Access Control Register = 0x%08x", cp15_nacr);
 900 #endif
 901
 902         /* Are we in an exception handler */
 903 //      armv4_5->exception_number = 0;
 904         if (armv7a->post_debug_entry)
 905                 armv7a->post_debug_entry(target);
 906
 907         return retval;
 908 }
 909
 910 static void cortex_a8_post_debug_entry(struct target *target)
 911 {
 912         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
 913         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
 914         int retval;
 915
 916         /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
 917         retval = armv7a->armv4_5_common.mrc(target, 15,
 918                         0, 0,   /* op1, op2 */
 919                         1, 0,   /* CRn, CRm */
 920                         &cortex_a8->cp15_control_reg);
 921         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a8->cp15_control_reg);
 922
 923         if (armv7a->armv4_5_mmu.armv4_5_cache.ctype == -1)
 924         {
 925                 uint32_t cache_type_reg;
 926
 927                 /* MRC p15,0,<Rt>,c0,c0,1 ; Read CP15 Cache Type Register */
 928                 retval = armv7a->armv4_5_common.mrc(target, 15,
 929                                 0, 1,   /* op1, op2 */
 930                                 0, 0,   /* CRn, CRm */
 931                                 &cache_type_reg);
 932                 LOG_DEBUG("cp15 cache type: %8.8x", (unsigned) cache_type_reg);
 933
 934                 /* FIXME the armv4_4 cache info DOES NOT APPLY to Cortex-A8 */
 935                 armv4_5_identify_cache(cache_type_reg,
 936                                 &armv7a->armv4_5_mmu.armv4_5_cache);
 937         }
 938
 939         armv7a->armv4_5_mmu.mmu_enabled =
 940                         (cortex_a8->cp15_control_reg & 0x1U) ? 1 : 0;
 941         armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled =
 942                         (cortex_a8->cp15_control_reg & 0x4U) ? 1 : 0;
 943         armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled =
 944                         (cortex_a8->cp15_control_reg & 0x1000U) ? 1 : 0;
 945
 946
 947 }
 948
 949 static int cortex_a8_step(struct target *target, int current, uint32_t address,
 950                 int handle_breakpoints)
 951 {
 952         struct armv7a_common *armv7a = target_to_armv7a(target);
 953         struct arm *armv4_5 = &armv7a->armv4_5_common;
 954         struct breakpoint *breakpoint = NULL;
 955         struct breakpoint stepbreakpoint;
 956         struct reg *r;
 957
 958         int timeout = 100;
 959
 960         if (target->state != TARGET_HALTED)
 961         {
 962                 LOG_WARNING("target not halted");
 963                 return ERROR_TARGET_NOT_HALTED;
 964         }
 965
 966         /* current = 1: continue on current pc, otherwise continue at <address> */
 967         r = armv4_5->core_cache->reg_list + 15;
 968         if (!current)
 969         {
 970                 buf_set_u32(r->value, 0, 32, address);
 971         }
 972         else
 973         {
 974                 address = buf_get_u32(r->value, 0, 32);
 975         }
 976
 977         /* The front-end may request us not to handle breakpoints.
 978          * But since Cortex-A8 uses breakpoint for single step,
 979          * we MUST handle breakpoints.
 980          */
 981         handle_breakpoints = 1;
 982         if (handle_breakpoints) {
 983                 breakpoint = breakpoint_find(target, address);
 984                 if (breakpoint)
 985                         cortex_a8_unset_breakpoint(target, breakpoint);
 986         }
 987
 988         /* Setup single step breakpoint */
 989         stepbreakpoint.address = address;
 990         stepbreakpoint.length = (armv4_5->core_state == ARMV4_5_STATE_THUMB)
 991                         ? 2 : 4;
 992         stepbreakpoint.type = BKPT_HARD;
 993         stepbreakpoint.set = 0;
 994
 995         /* Break on IVA mismatch */
 996         cortex_a8_set_breakpoint(target, &stepbreakpoint, 0x04);
 997
 998         target->debug_reason = DBG_REASON_SINGLESTEP;
 999
1000         cortex_a8_resume(target, 1, address, 0, 0);
1001
1002         while (target->state != TARGET_HALTED)
1003         {
1004                 cortex_a8_poll(target);
1005                 if (--timeout == 0)
1006                 {
1007                         LOG_WARNING("timeout waiting for target halt");
1008                         break;
1009                 }
1010         }
1011
1012         cortex_a8_unset_breakpoint(target, &stepbreakpoint);
1013         if (timeout > 0)
1014                 target->debug_reason = DBG_REASON_BREAKPOINT;
1015
1016         if (breakpoint)
1017                 cortex_a8_set_breakpoint(target, breakpoint, 0);
1018
1019         if (target->state != TARGET_HALTED)
1020                 LOG_DEBUG("target stepped");
1021
1022         return ERROR_OK;
1023 }
1024
1025 static int cortex_a8_restore_context(struct target *target, bool bpwp)
1026 {
1027         struct armv7a_common *armv7a = target_to_armv7a(target);
1028
1029         LOG_DEBUG(" ");
1030
1031         if (armv7a->pre_restore_context)
1032                 armv7a->pre_restore_context(target);
1033
1034         arm_dpm_write_dirty_registers(&armv7a->dpm, bpwp);
1035
1036         if (armv7a->post_restore_context)
1037                 armv7a->post_restore_context(target);
1038
1039         return ERROR_OK;
1040 }
1041
1042
1043 /*
1044  * Cortex-A8 Breakpoint and watchpoint fuctions
1045  */
1046
1047 /* Setup hardware Breakpoint Register Pair */
1048 static int cortex_a8_set_breakpoint(struct target *target,
1049                 struct breakpoint *breakpoint, uint8_t matchmode)
1050 {
1051         int retval;
1052         int brp_i=0;
1053         uint32_t control;
1054         uint8_t byte_addr_select = 0x0F;
1055         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1056         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1057         struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1058
1059         if (breakpoint->set)
1060         {
1061                 LOG_WARNING("breakpoint already set");
1062                 return ERROR_OK;
1063         }
1064
1065         if (breakpoint->type == BKPT_HARD)
1066         {
1067                 while (brp_list[brp_i].used && (brp_i < cortex_a8->brp_num))
1068                         brp_i++ ;
1069                 if (brp_i >= cortex_a8->brp_num)
1070                 {
1071                         LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1072                         return ERROR_FAIL;
1073                 }
1074                 breakpoint->set = brp_i + 1;
1075                 if (breakpoint->length == 2)
1076                 {
1077                         byte_addr_select = (3 << (breakpoint->address & 0x02));
1078                 }
1079                 control = ((matchmode & 0x7) << 20)
1080                                 | (byte_addr_select << 5)
1081                                 | (3 << 1) | 1;
1082                 brp_list[brp_i].used = 1;
1083                 brp_list[brp_i].value = (breakpoint->address & 0xFFFFFFFC);
1084                 brp_list[brp_i].control = control;
1085                 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1086                                 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1087                                 brp_list[brp_i].value);
1088                 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1089                                 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1090                                 brp_list[brp_i].control);
1091                 LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1092                                 brp_list[brp_i].control,
1093                                 brp_list[brp_i].value);
1094         }
1095         else if (breakpoint->type == BKPT_SOFT)
1096         {
1097                 uint8_t code[4];
1098                 if (breakpoint->length == 2)
1099                 {
1100                         buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1101                 }
1102                 else
1103                 {
1104                         buf_set_u32(code, 0, 32, ARMV5_BKPT(0x11));
1105                 }
1106                 retval = target->type->read_memory(target,
1107                                 breakpoint->address & 0xFFFFFFFE,
1108                                 breakpoint->length, 1,
1109                                 breakpoint->orig_instr);
1110                 if (retval != ERROR_OK)
1111                         return retval;
1112                 retval = target->type->write_memory(target,
1113                                 breakpoint->address & 0xFFFFFFFE,
1114                                 breakpoint->length, 1, code);
1115                 if (retval != ERROR_OK)
1116                         return retval;
1117                 breakpoint->set = 0x11; /* Any nice value but 0 */
1118         }
1119
1120         return ERROR_OK;
1121 }
1122
1123 static int cortex_a8_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1124 {
1125         int retval;
1126         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1127         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1128         struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1129
1130         if (!breakpoint->set)
1131         {
1132                 LOG_WARNING("breakpoint not set");
1133                 return ERROR_OK;
1134         }
1135
1136         if (breakpoint->type == BKPT_HARD)
1137         {
1138                 int brp_i = breakpoint->set - 1;
1139                 if ((brp_i < 0) || (brp_i >= cortex_a8->brp_num))
1140                 {
1141                         LOG_DEBUG("Invalid BRP number in breakpoint");
1142                         return ERROR_OK;
1143                 }
1144                 LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1145                                 brp_list[brp_i].control, brp_list[brp_i].value);
1146                 brp_list[brp_i].used = 0;
1147                 brp_list[brp_i].value = 0;
1148                 brp_list[brp_i].control = 0;
1149                 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1150                                 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1151                                 brp_list[brp_i].control);
1152                 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1153                                 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1154                                 brp_list[brp_i].value);
1155         }
1156         else
1157         {
1158                 /* restore original instruction (kept in target endianness) */
1159                 if (breakpoint->length == 4)
1160                 {
1161                         retval = target->type->write_memory(target,
1162                                         breakpoint->address & 0xFFFFFFFE,
1163                                         4, 1, breakpoint->orig_instr);
1164                         if (retval != ERROR_OK)
1165                                 return retval;
1166                 }
1167                 else
1168                 {
1169                         retval = target->type->write_memory(target,
1170                                         breakpoint->address & 0xFFFFFFFE,
1171                                         2, 1, breakpoint->orig_instr);
1172                         if (retval != ERROR_OK)
1173                                 return retval;
1174                 }
1175         }
1176         breakpoint->set = 0;
1177
1178         return ERROR_OK;
1179 }
1180
1181 static int cortex_a8_add_breakpoint(struct target *target,
1182                 struct breakpoint *breakpoint)
1183 {
1184         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1185
1186         if ((breakpoint->type == BKPT_HARD) && (cortex_a8->brp_num_available < 1))
1187         {
1188                 LOG_INFO("no hardware breakpoint available");
1189                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1190         }
1191
1192         if (breakpoint->type == BKPT_HARD)
1193                 cortex_a8->brp_num_available--;
1194         cortex_a8_set_breakpoint(target, breakpoint, 0x00); /* Exact match */
1195
1196         return ERROR_OK;
1197 }
1198
1199 static int cortex_a8_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1200 {
1201         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1202
1203 #if 0
1204 /* It is perfectly possible to remove brakpoints while the taget is running */
1205         if (target->state != TARGET_HALTED)
1206         {
1207                 LOG_WARNING("target not halted");
1208                 return ERROR_TARGET_NOT_HALTED;
1209         }
1210 #endif
1211
1212         if (breakpoint->set)
1213         {
1214                 cortex_a8_unset_breakpoint(target, breakpoint);
1215                 if (breakpoint->type == BKPT_HARD)
1216                         cortex_a8->brp_num_available++ ;
1217         }
1218
1219
1220         return ERROR_OK;
1221 }
1222
1223
1224
1225 /*
1226  * Cortex-A8 Reset fuctions
1227  */
1228
1229 static int cortex_a8_assert_reset(struct target *target)
1230 {
1231         struct armv7a_common *armv7a = target_to_armv7a(target);
1232
1233         LOG_DEBUG(" ");
1234
1235         /* FIXME when halt is requested, make it work somehow... */
1236
1237         /* Issue some kind of warm reset. */
1238         if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
1239                 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
1240         } else if (jtag_get_reset_config() & RESET_HAS_SRST) {
1241                 /* REVISIT handle "pulls" cases, if there's
1242                  * hardware that needs them to work.
1243                  */
1244                 jtag_add_reset(0, 1);
1245         } else {
1246                 LOG_ERROR("%s: how to reset?", target_name(target));
1247                 return ERROR_FAIL;
1248         }
1249
1250         /* registers are now invalid */
1251         register_cache_invalidate(armv7a->armv4_5_common.core_cache);
1252
1253         target->state = TARGET_RESET;
1254
1255         return ERROR_OK;
1256 }
1257
1258 static int cortex_a8_deassert_reset(struct target *target)
1259 {
1260         int retval;
1261
1262         LOG_DEBUG(" ");
1263
1264         /* be certain SRST is off */
1265         jtag_add_reset(0, 0);
1266
1267         retval = cortex_a8_poll(target);
1268
1269         if (target->reset_halt) {
1270                 if (target->state != TARGET_HALTED) {
1271                         LOG_WARNING("%s: ran after reset and before halt ...",
1272                                         target_name(target));
1273                         if ((retval = target_halt(target)) != ERROR_OK)
1274                                 return retval;
1275                 }
1276         }
1277
1278         return ERROR_OK;
1279 }
1280
1281 /*
1282  * Cortex-A8 Memory access
1283  *
1284  * This is same Cortex M3 but we must also use the correct
1285  * ap number for every access.
1286  */
1287
1288 static int cortex_a8_read_memory(struct target *target, uint32_t address,
1289                 uint32_t size, uint32_t count, uint8_t *buffer)
1290 {
1291         struct armv7a_common *armv7a = target_to_armv7a(target);
1292         struct swjdp_common *swjdp = &armv7a->swjdp_info;
1293         int retval = ERROR_INVALID_ARGUMENTS;
1294
1295         /* cortex_a8 handles unaligned memory access */
1296
1297 // ???  dap_ap_select(swjdp, swjdp_memoryap);
1298
1299         if (count && buffer) {
1300                 switch (size) {
1301                 case 4:
1302                         retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
1303                         break;
1304                 case 2:
1305                         retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
1306                         break;
1307                 case 1:
1308                         retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
1309                         break;
1310                 }
1311         }
1312
1313         return retval;
1314 }
1315
1316 static int cortex_a8_write_memory(struct target *target, uint32_t address,
1317                 uint32_t size, uint32_t count, uint8_t *buffer)
1318 {
1319         struct armv7a_common *armv7a = target_to_armv7a(target);
1320         struct swjdp_common *swjdp = &armv7a->swjdp_info;
1321         int retval = ERROR_INVALID_ARGUMENTS;
1322
1323 // ???  dap_ap_select(swjdp, swjdp_memoryap);
1324
1325         if (count && buffer) {
1326                 switch (size) {
1327                 case 4:
1328                         retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
1329                         break;
1330                 case 2:
1331                         retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
1332                         break;
1333                 case 1:
1334                         retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
1335                         break;
1336                 }
1337         }
1338
1339         /* REVISIT this op is generic ARMv7-A/R stuff */
1340         if (retval == ERROR_OK && target->state == TARGET_HALTED)
1341         {
1342                 struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
1343
1344                 retval = dpm->prepare(dpm);
1345                 if (retval != ERROR_OK)
1346                         return retval;
1347
1348                 /* The Cache handling will NOT work with MMU active, the
1349                  * wrong addresses will be invalidated!
1350                  *
1351                  * For both ICache and DCache, walk all cache lines in the
1352                  * address range. Cortex-A8 has fixed 64 byte line length.
1353                  *
1354                  * REVISIT per ARMv7, these may trigger watchpoints ...
1355                  */
1356
1357                 /* invalidate I-Cache */
1358                 if (armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
1359                 {
1360                         /* ICIMVAU - Invalidate Cache single entry
1361                          * with MVA to PoU
1362                          *      MCR p15, 0, r0, c7, c5, 1
1363                          */
1364                         for (uint32_t cacheline = address;
1365                                         cacheline < address + size * count;
1366                                         cacheline += 64) {
1367                                 retval = dpm->instr_write_data_r0(dpm,
1368                                         ARMV4_5_MCR(15, 0, 0, 7, 5, 1),
1369                                         cacheline);
1370                         }
1371                 }
1372
1373                 /* invalidate D-Cache */
1374                 if (armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
1375                 {
1376                         /* DCIMVAC - Invalidate data Cache line
1377                          * with MVA to PoC
1378                          *      MCR p15, 0, r0, c7, c6, 1
1379                          */
1380                         for (uint32_t cacheline = address;
1381                                         cacheline < address + size * count;
1382                                         cacheline += 64) {
1383                                 retval = dpm->instr_write_data_r0(dpm,
1384                                         ARMV4_5_MCR(15, 0, 0, 7, 6, 1),
1385                                         cacheline);
1386                         }
1387                 }
1388
1389                 /* (void) */ dpm->finish(dpm);
1390         }
1391
1392         return retval;
1393 }
1394
1395 static int cortex_a8_bulk_write_memory(struct target *target, uint32_t address,
1396                 uint32_t count, uint8_t *buffer)
1397 {
1398         return cortex_a8_write_memory(target, address, 4, count, buffer);
1399 }
1400
1401
1402 static int cortex_a8_dcc_read(struct swjdp_common *swjdp, uint8_t *value, uint8_t *ctrl)
1403 {
1404 #if 0
1405         u16 dcrdr;
1406
1407         mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1408         *ctrl = (uint8_t)dcrdr;
1409         *value = (uint8_t)(dcrdr >> 8);
1410
1411         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1412
1413         /* write ack back to software dcc register
1414          * signify we have read data */
1415         if (dcrdr & (1 << 0))
1416         {
1417                 dcrdr = 0;
1418                 mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1419         }
1420 #endif
1421         return ERROR_OK;
1422 }
1423
1424
1425 static int cortex_a8_handle_target_request(void *priv)
1426 {
1427         struct target *target = priv;
1428         struct armv7a_common *armv7a = target_to_armv7a(target);
1429         struct swjdp_common *swjdp = &armv7a->swjdp_info;
1430
1431         if (!target_was_examined(target))
1432                 return ERROR_OK;
1433         if (!target->dbg_msg_enabled)
1434                 return ERROR_OK;
1435
1436         if (target->state == TARGET_RUNNING)
1437         {
1438                 uint8_t data = 0;
1439                 uint8_t ctrl = 0;
1440
1441                 cortex_a8_dcc_read(swjdp, &data, &ctrl);
1442
1443                 /* check if we have data */
1444                 if (ctrl & (1 << 0))
1445                 {
1446                         uint32_t request;
1447
1448                         /* we assume target is quick enough */
1449                         request = data;
1450                         cortex_a8_dcc_read(swjdp, &data, &ctrl);
1451                         request |= (data << 8);
1452                         cortex_a8_dcc_read(swjdp, &data, &ctrl);
1453                         request |= (data << 16);
1454                         cortex_a8_dcc_read(swjdp, &data, &ctrl);
1455                         request |= (data << 24);
1456                         target_request(target, request);
1457                 }
1458         }
1459
1460         return ERROR_OK;
1461 }
1462
1463 /*
1464  * Cortex-A8 target information and configuration
1465  */
1466
1467 static int cortex_a8_examine_first(struct target *target)
1468 {
1469         struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1470         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1471         struct swjdp_common *swjdp = &armv7a->swjdp_info;
1472         int i;
1473         int retval = ERROR_OK;
1474         uint32_t didr, ctypr, ttypr, cpuid;
1475
1476         LOG_DEBUG("TODO");
1477
1478         /* Here we shall insert a proper ROM Table scan */
1479         armv7a->debug_base = OMAP3530_DEBUG_BASE;
1480
1481         /* We do one extra read to ensure DAP is configured,
1482          * we call ahbap_debugport_init(swjdp) instead
1483          */
1484         ahbap_debugport_init(swjdp);
1485         mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_CPUID, &cpuid);
1486         if ((retval = mem_ap_read_atomic_u32(swjdp,
1487                         armv7a->debug_base + CPUDBG_CPUID, &cpuid)) != ERROR_OK)
1488         {
1489                 LOG_DEBUG("Examine failed");
1490                 return retval;
1491         }
1492
1493         if ((retval = mem_ap_read_atomic_u32(swjdp,
1494                         armv7a->debug_base + CPUDBG_CTYPR, &ctypr)) != ERROR_OK)
1495         {
1496                 LOG_DEBUG("Examine failed");
1497                 return retval;
1498         }
1499
1500         if ((retval = mem_ap_read_atomic_u32(swjdp,
1501                         armv7a->debug_base + CPUDBG_TTYPR, &ttypr)) != ERROR_OK)
1502         {
1503                 LOG_DEBUG("Examine failed");
1504                 return retval;
1505         }
1506
1507         if ((retval = mem_ap_read_atomic_u32(swjdp,
1508                         armv7a->debug_base + CPUDBG_DIDR, &didr)) != ERROR_OK)
1509         {
1510                 LOG_DEBUG("Examine failed");
1511                 return retval;
1512         }
1513
1514         LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
1515         LOG_DEBUG("ctypr = 0x%08" PRIx32, ctypr);
1516         LOG_DEBUG("ttypr = 0x%08" PRIx32, ttypr);
1517         LOG_DEBUG("didr = 0x%08" PRIx32, didr);
1518
1519         armv7a->armv4_5_common.core_type = ARM_MODE_MON;
1520         cortex_a8_dpm_setup(cortex_a8, didr);
1521
1522         /* Setup Breakpoint Register Pairs */
1523         cortex_a8->brp_num = ((didr >> 24) & 0x0F) + 1;
1524         cortex_a8->brp_num_context = ((didr >> 20) & 0x0F) + 1;
1525         cortex_a8->brp_num_available = cortex_a8->brp_num;
1526         cortex_a8->brp_list = calloc(cortex_a8->brp_num, sizeof(struct cortex_a8_brp));
1527 //      cortex_a8->brb_enabled = ????;
1528         for (i = 0; i < cortex_a8->brp_num; i++)
1529         {
1530                 cortex_a8->brp_list[i].used = 0;
1531                 if (i < (cortex_a8->brp_num-cortex_a8->brp_num_context))
1532                         cortex_a8->brp_list[i].type = BRP_NORMAL;
1533                 else
1534                         cortex_a8->brp_list[i].type = BRP_CONTEXT;
1535                 cortex_a8->brp_list[i].value = 0;
1536                 cortex_a8->brp_list[i].control = 0;
1537                 cortex_a8->brp_list[i].BRPn = i;
1538         }
1539
1540         LOG_DEBUG("Configured %i hw breakpoints", cortex_a8->brp_num);
1541
1542         target_set_examined(target);
1543         return ERROR_OK;
1544 }
1545
1546 static int cortex_a8_examine(struct target *target)
1547 {
1548         int retval = ERROR_OK;
1549
1550         /* don't re-probe hardware after each reset */
1551         if (!target_was_examined(target))
1552                 retval = cortex_a8_examine_first(target);
1553
1554         /* Configure core debug access */
1555         if (retval == ERROR_OK)
1556                 retval = cortex_a8_init_debug_access(target);
1557
1558         return retval;
1559 }
1560
1561 /*
1562  *      Cortex-A8 target creation and initialization
1563  */
1564
1565 static int cortex_a8_init_target(struct command_context *cmd_ctx,
1566                 struct target *target)
1567 {
1568         /* examine_first() does a bunch of this */
1569         return ERROR_OK;
1570 }
1571
1572 static int cortex_a8_init_arch_info(struct target *target,
1573                 struct cortex_a8_common *cortex_a8, struct jtag_tap *tap)
1574 {
1575         struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1576         struct arm *armv4_5 = &armv7a->armv4_5_common;
1577         struct swjdp_common *swjdp = &armv7a->swjdp_info;
1578
1579         /* Setup struct cortex_a8_common */
1580         cortex_a8->common_magic = CORTEX_A8_COMMON_MAGIC;
1581         armv4_5->arch_info = armv7a;
1582
1583         /* prepare JTAG information for the new target */
1584         cortex_a8->jtag_info.tap = tap;
1585         cortex_a8->jtag_info.scann_size = 4;
1586
1587         swjdp->dp_select_value = -1;
1588         swjdp->ap_csw_value = -1;
1589         swjdp->ap_tar_value = -1;
1590         swjdp->jtag_info = &cortex_a8->jtag_info;
1591         swjdp->memaccess_tck = 80;
1592
1593         /* Number of bits for tar autoincrement, impl. dep. at least 10 */
1594         swjdp->tar_autoincr_block = (1 << 10);
1595
1596         cortex_a8->fast_reg_read = 0;
1597
1598         /* register arch-specific functions */
1599         armv7a->examine_debug_reason = NULL;
1600
1601         armv7a->post_debug_entry = cortex_a8_post_debug_entry;
1602
1603         armv7a->pre_restore_context = NULL;
1604         armv7a->post_restore_context = NULL;
1605         armv7a->armv4_5_mmu.armv4_5_cache.ctype = -1;
1606 //      armv7a->armv4_5_mmu.get_ttb = armv7a_get_ttb;
1607         armv7a->armv4_5_mmu.read_memory = cortex_a8_read_memory;
1608         armv7a->armv4_5_mmu.write_memory = cortex_a8_write_memory;
1609 //      armv7a->armv4_5_mmu.disable_mmu_caches = armv7a_disable_mmu_caches;
1610 //      armv7a->armv4_5_mmu.enable_mmu_caches = armv7a_enable_mmu_caches;
1611         armv7a->armv4_5_mmu.has_tiny_pages = 1;
1612         armv7a->armv4_5_mmu.mmu_enabled = 0;
1613
1614
1615 //      arm7_9->handle_target_request = cortex_a8_handle_target_request;
1616
1617         /* REVISIT v7a setup should be in a v7a-specific routine */
1618         armv4_5_init_arch_info(target, armv4_5);
1619         armv7a->common_magic = ARMV7_COMMON_MAGIC;
1620
1621         target_register_timer_callback(cortex_a8_handle_target_request, 1, 1, target);
1622
1623         return ERROR_OK;
1624 }
1625
1626 static int cortex_a8_target_create(struct target *target, Jim_Interp *interp)
1627 {
1628         struct cortex_a8_common *cortex_a8 = calloc(1, sizeof(struct cortex_a8_common));
1629
1630         cortex_a8_init_arch_info(target, cortex_a8, target->tap);
1631
1632         return ERROR_OK;
1633 }
1634
1635 COMMAND_HANDLER(cortex_a8_handle_cache_info_command)
1636 {
1637         struct target *target = get_current_target(CMD_CTX);
1638         struct armv7a_common *armv7a = target_to_armv7a(target);
1639
1640         return armv4_5_handle_cache_info_command(CMD_CTX,
1641                         &armv7a->armv4_5_mmu.armv4_5_cache);
1642 }
1643
1644
1645 COMMAND_HANDLER(cortex_a8_handle_dbginit_command)
1646 {
1647         struct target *target = get_current_target(CMD_CTX);
1648
1649         cortex_a8_init_debug_access(target);
1650
1651         return ERROR_OK;
1652 }
1653
1654 static const struct command_registration cortex_a8_exec_command_handlers[] = {
1655         {
1656                 .name = "cache_info",
1657                 .handler = &cortex_a8_handle_cache_info_command,
1658                 .mode = COMMAND_EXEC,
1659                 .help = "display information about target caches",
1660         },
1661         {
1662                 .name = "dbginit",
1663                 .handler = &cortex_a8_handle_dbginit_command,
1664                 .mode = COMMAND_EXEC,
1665                 .help = "Initialize core debug",
1666         },
1667         COMMAND_REGISTRATION_DONE
1668 };
1669 static const struct command_registration cortex_a8_command_handlers[] = {
1670         {
1671                 .chain = arm_command_handlers,
1672         },
1673         {
1674                 .chain = armv7a_command_handlers,
1675         },
1676         {
1677                 .name = "cortex_a8",
1678                 .mode = COMMAND_ANY,
1679                 .help = "Cortex-A8 command group",
1680                 .chain = cortex_a8_exec_command_handlers,
1681         },
1682         COMMAND_REGISTRATION_DONE
1683 };
1684
1685 struct target_type cortexa8_target = {
1686         .name = "cortex_a8",
1687
1688         .poll = cortex_a8_poll,
1689         .arch_state = armv7a_arch_state,
1690
1691         .target_request_data = NULL,
1692
1693         .halt = cortex_a8_halt,
1694         .resume = cortex_a8_resume,
1695         .step = cortex_a8_step,
1696
1697         .assert_reset = cortex_a8_assert_reset,
1698         .deassert_reset = cortex_a8_deassert_reset,
1699         .soft_reset_halt = NULL,
1700
1701         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
1702
1703         .read_memory = cortex_a8_read_memory,
1704         .write_memory = cortex_a8_write_memory,
1705         .bulk_write_memory = cortex_a8_bulk_write_memory,
1706
1707         .checksum_memory = arm_checksum_memory,
1708         .blank_check_memory = arm_blank_check_memory,
1709
1710         .run_algorithm = armv4_5_run_algorithm,
1711
1712         .add_breakpoint = cortex_a8_add_breakpoint,
1713         .remove_breakpoint = cortex_a8_remove_breakpoint,
1714         .add_watchpoint = NULL,
1715         .remove_watchpoint = NULL,
1716
1717         .commands = cortex_a8_command_handlers,
1718         .target_create = cortex_a8_target_create,
1719         .init_target = cortex_a8_init_target,
1720         .examine = cortex_a8_examine,
1721 };