src/target/arm926ejs.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008,2009 by Øyvind Harboe                         *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "arm926ejs.h"
  28 #include "time_support.h"
  29 #include "target_type.h"
  30 #include "register.h"
  31
  32
  33 /*
  34  * The ARM926 is built around the ARM9EJ-S core, and most JTAG docs
  35  * are in the ARM9EJ-S Technical Reference Manual (ARM DDI 0222B) not
  36  * the ARM926 manual (ARM DDI 0198E).  The scan chains are:
  37  *
  38  *   1 ... core debugging
  39  *   2 ... EmbeddedICE
  40  *   3 ... external boundary scan (SoC-specific, unused here)
  41  *   6 ... ETM
  42  *   15 ... coprocessor 15
  43  */
  44
  45 #if 0
  46 #define _DEBUG_INSTRUCTION_EXECUTION_
  47 #endif
  48
  49 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
  50
  51 static int arm926ejs_cp15_read(struct target *target, uint32_t op1, uint32_t op2,
  52                 uint32_t CRn, uint32_t CRm, uint32_t *value)
  53 {
  54         int retval = ERROR_OK;
  55         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  56         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
  57         uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
  58         struct scan_field fields[4];
  59         uint8_t address_buf[2];
  60         uint8_t nr_w_buf = 0;
  61         uint8_t access = 1;
  62
  63         buf_set_u32(address_buf, 0, 14, address);
  64
  65         jtag_set_end_state(TAP_IDLE);
  66         if ((retval = arm_jtag_scann(jtag_info, 0xf)) != ERROR_OK)
  67         {
  68                 return retval;
  69         }
  70         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
  71
  72         fields[0].tap = jtag_info->tap;
  73         fields[0].num_bits = 32;
  74         fields[0].out_value = NULL;
  75         fields[0].in_value = (uint8_t *)value;
  76
  77
  78         fields[1].tap = jtag_info->tap;
  79         fields[1].num_bits = 1;
  80         fields[1].out_value = &access;
  81         fields[1].in_value = &access;
  82
  83         fields[2].tap = jtag_info->tap;
  84         fields[2].num_bits = 14;
  85         fields[2].out_value = address_buf;
  86         fields[2].in_value = NULL;
  87
  88         fields[3].tap = jtag_info->tap;
  89         fields[3].num_bits = 1;
  90         fields[3].out_value = &nr_w_buf;
  91         fields[3].in_value = NULL;
  92
  93         jtag_add_dr_scan(4, fields, jtag_get_end_state());
  94
  95         long long then = timeval_ms();
  96
  97         for (;;)
  98         {
  99                 /* rescan with NOP, to wait for the access to complete */
 100                 access = 0;
 101                 nr_w_buf = 0;
 102                 jtag_add_dr_scan(4, fields, jtag_get_end_state());
 103
 104                 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 105
 106                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 107                 {
 108                         return retval;
 109                 }
 110
 111                 if (buf_get_u32(&access, 0, 1) == 1)
 112                 {
 113                         break;
 114                 }
 115
 116                 /* 10ms timeout */
 117                 if ((timeval_ms()-then)>10)
 118                 {
 119                         LOG_ERROR("cp15 read operation timed out");
 120                         return ERROR_FAIL;
 121                 }
 122         }
 123
 124 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 125         LOG_DEBUG("addr: 0x%x value: %8.8x", address, *value);
 126 #endif
 127
 128         arm_jtag_set_instr(jtag_info, 0xc, NULL);
 129
 130         return ERROR_OK;
 131 }
 132
 133 static int arm926ejs_mrc(struct target *target, int cpnum, uint32_t op1,
 134                 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
 135 {
 136         if (cpnum != 15) {
 137                 LOG_ERROR("Only cp15 is supported");
 138                 return ERROR_FAIL;
 139         }
 140         return arm926ejs_cp15_read(target, op1, op2, CRn, CRm, value);
 141 }
 142
 143 static int arm926ejs_cp15_write(struct target *target, uint32_t op1, uint32_t op2,
 144                 uint32_t CRn, uint32_t CRm, uint32_t value)
 145 {
 146         int retval = ERROR_OK;
 147         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 148         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 149         uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
 150         struct scan_field fields[4];
 151         uint8_t value_buf[4];
 152         uint8_t address_buf[2];
 153         uint8_t nr_w_buf = 1;
 154         uint8_t access = 1;
 155
 156         buf_set_u32(address_buf, 0, 14, address);
 157         buf_set_u32(value_buf, 0, 32, value);
 158
 159         jtag_set_end_state(TAP_IDLE);
 160         if ((retval = arm_jtag_scann(jtag_info, 0xf)) != ERROR_OK)
 161         {
 162                 return retval;
 163         }
 164         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 165
 166         fields[0].tap = jtag_info->tap;
 167         fields[0].num_bits = 32;
 168         fields[0].out_value = value_buf;
 169         fields[0].in_value = NULL;
 170
 171         fields[1].tap = jtag_info->tap;
 172         fields[1].num_bits = 1;
 173         fields[1].out_value = &access;
 174         fields[1].in_value = &access;
 175
 176         fields[2].tap = jtag_info->tap;
 177         fields[2].num_bits = 14;
 178         fields[2].out_value = address_buf;
 179         fields[2].in_value = NULL;
 180
 181         fields[3].tap = jtag_info->tap;
 182         fields[3].num_bits = 1;
 183         fields[3].out_value = &nr_w_buf;
 184         fields[3].in_value = NULL;
 185
 186         jtag_add_dr_scan(4, fields, jtag_get_end_state());
 187
 188         long long then = timeval_ms();
 189
 190         for (;;)
 191         {
 192                 /* rescan with NOP, to wait for the access to complete */
 193                 access = 0;
 194                 nr_w_buf = 0;
 195                 jtag_add_dr_scan(4, fields, jtag_get_end_state());
 196                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 197                 {
 198                         return retval;
 199                 }
 200
 201                 if (buf_get_u32(&access, 0, 1) == 1)
 202                 {
 203                         break;
 204                 }
 205
 206                 /* 10ms timeout */
 207                 if ((timeval_ms()-then)>10)
 208                 {
 209                         LOG_ERROR("cp15 write operation timed out");
 210                         return ERROR_FAIL;
 211                 }
 212         }
 213
 214 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 215         LOG_DEBUG("addr: 0x%x value: %8.8x", address, value);
 216 #endif
 217
 218         arm_jtag_set_instr(jtag_info, 0xf, NULL);
 219
 220         return ERROR_OK;
 221 }
 222
 223 static int arm926ejs_mcr(struct target *target, int cpnum, uint32_t op1,
 224                 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
 225 {
 226         if (cpnum != 15) {
 227                 LOG_ERROR("Only cp15 is supported");
 228                 return ERROR_FAIL;
 229         }
 230         return arm926ejs_cp15_write(target, op1, op2, CRn, CRm, value);
 231 }
 232
 233 static int arm926ejs_examine_debug_reason(struct target *target)
 234 {
 235         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 236         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 237         int debug_reason;
 238         int retval;
 239
 240         embeddedice_read_reg(dbg_stat);
 241         if ((retval = jtag_execute_queue()) != ERROR_OK)
 242                 return retval;
 243
 244         /* Method-Of-Entry (MOE) field */
 245         debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
 246
 247         switch (debug_reason)
 248         {
 249                 case 0:
 250                         LOG_DEBUG("no *NEW* debug entry (?missed one?)");
 251                         /* ... since last restart or debug reset ... */
 252                         target->debug_reason = DBG_REASON_DBGRQ;
 253                         break;
 254                 case 1:
 255                         LOG_DEBUG("breakpoint from EICE unit 0");
 256                         target->debug_reason = DBG_REASON_BREAKPOINT;
 257                         break;
 258                 case 2:
 259                         LOG_DEBUG("breakpoint from EICE unit 1");
 260                         target->debug_reason = DBG_REASON_BREAKPOINT;
 261                         break;
 262                 case 3:
 263                         LOG_DEBUG("soft breakpoint (BKPT instruction)");
 264                         target->debug_reason = DBG_REASON_BREAKPOINT;
 265                         break;
 266                 case 4:
 267                         LOG_DEBUG("vector catch breakpoint");
 268                         target->debug_reason = DBG_REASON_BREAKPOINT;
 269                         break;
 270                 case 5:
 271                         LOG_DEBUG("external breakpoint");
 272                         target->debug_reason = DBG_REASON_BREAKPOINT;
 273                         break;
 274                 case 6:
 275                         LOG_DEBUG("watchpoint from EICE unit 0");
 276                         target->debug_reason = DBG_REASON_WATCHPOINT;
 277                         break;
 278                 case 7:
 279                         LOG_DEBUG("watchpoint from EICE unit 1");
 280                         target->debug_reason = DBG_REASON_WATCHPOINT;
 281                         break;
 282                 case 8:
 283                         LOG_DEBUG("external watchpoint");
 284                         target->debug_reason = DBG_REASON_WATCHPOINT;
 285                         break;
 286                 case 9:
 287                         LOG_DEBUG("internal debug request");
 288                         target->debug_reason = DBG_REASON_DBGRQ;
 289                         break;
 290                 case 10:
 291                         LOG_DEBUG("external debug request");
 292                         target->debug_reason = DBG_REASON_DBGRQ;
 293                         break;
 294                 case 11:
 295                         LOG_DEBUG("debug re-entry from system speed access");
 296                         /* This is normal when connecting to something that's
 297                          * already halted, or in some related code paths, but
 298                          * otherwise is surprising (and presumably wrong).
 299                          */
 300                         switch (target->debug_reason) {
 301                         case DBG_REASON_DBGRQ:
 302                                 break;
 303                         default:
 304                                 LOG_ERROR("unexpected -- debug re-entry");
 305                                 /* FALLTHROUGH */
 306                         case DBG_REASON_UNDEFINED:
 307                                 target->debug_reason = DBG_REASON_DBGRQ;
 308                                 break;
 309                         }
 310                         break;
 311                 case 12:
 312                         /* FIX!!!! here be dragons!!! We need to fail here so
 313                          * the target will interpreted as halted but we won't
 314                          * try to talk to it right now... a resume + halt seems
 315                          * to sync things up again. Please send an email to
 316                          * openocd development mailing list if you have hardware
 317                          * to donate to look into this problem....
 318                          */
 319                         LOG_WARNING("WARNING: mystery debug reason MOE = 0xc. Try issuing a resume + halt.");
 320                         target->debug_reason = DBG_REASON_DBGRQ;
 321                         break;
 322                 default:
 323                         LOG_WARNING("WARNING: unknown debug reason: 0x%x", debug_reason);
 324                         /* Oh agony! should we interpret this as a halt request or
 325                          * that the target stopped on it's own accord?
 326                          */
 327                         target->debug_reason = DBG_REASON_DBGRQ;
 328                         /* if we fail here, we won't talk to the target and it will
 329                          * be reported to be in the halted state */
 330                         break;
 331         }
 332
 333         return ERROR_OK;
 334 }
 335
 336 static uint32_t arm926ejs_get_ttb(struct target *target)
 337 {
 338         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 339         int retval;
 340         uint32_t ttb = 0x0;
 341
 342         if ((retval = arm926ejs->read_cp15(target, 0, 0, 2, 0, &ttb)) != ERROR_OK)
 343                 return retval;
 344
 345         return ttb;
 346 }
 347
 348 static void arm926ejs_disable_mmu_caches(struct target *target, int mmu,
 349                 int d_u_cache, int i_cache)
 350 {
 351         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 352         uint32_t cp15_control;
 353
 354         /* read cp15 control register */
 355         arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
 356         jtag_execute_queue();
 357
 358         if (mmu)
 359         {
 360                 /* invalidate TLB */
 361                 arm926ejs->write_cp15(target, 0, 0, 8, 7, 0x0);
 362
 363                 cp15_control &= ~0x1U;
 364         }
 365
 366         if (d_u_cache)
 367         {
 368                 uint32_t debug_override;
 369                 /* read-modify-write CP15 debug override register
 370                  * to enable "test and clean all" */
 371                 arm926ejs->read_cp15(target, 0, 0, 15, 0, &debug_override);
 372                 debug_override |= 0x80000;
 373                 arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
 374
 375                 /* clean and invalidate DCache */
 376                 arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
 377
 378                 /* write CP15 debug override register
 379                  * to disable "test and clean all" */
 380                 debug_override &= ~0x80000;
 381                 arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
 382
 383                 cp15_control &= ~0x4U;
 384         }
 385
 386         if (i_cache)
 387         {
 388                 /* invalidate ICache */
 389                 arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
 390
 391                 cp15_control &= ~0x1000U;
 392         }
 393
 394         arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
 395 }
 396
 397 static void arm926ejs_enable_mmu_caches(struct target *target, int mmu,
 398                 int d_u_cache, int i_cache)
 399 {
 400         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 401         uint32_t cp15_control;
 402
 403         /* read cp15 control register */
 404         arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
 405         jtag_execute_queue();
 406
 407         if (mmu)
 408                 cp15_control |= 0x1U;
 409
 410         if (d_u_cache)
 411                 cp15_control |= 0x4U;
 412
 413         if (i_cache)
 414                 cp15_control |= 0x1000U;
 415
 416         arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
 417 }
 418
 419 static void arm926ejs_post_debug_entry(struct target *target)
 420 {
 421         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 422
 423         /* examine cp15 control reg */
 424         arm926ejs->read_cp15(target, 0, 0, 1, 0, &arm926ejs->cp15_control_reg);
 425         jtag_execute_queue();
 426         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm926ejs->cp15_control_reg);
 427
 428         if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1)
 429         {
 430                 uint32_t cache_type_reg;
 431                 /* identify caches */
 432                 arm926ejs->read_cp15(target, 0, 1, 0, 0, &cache_type_reg);
 433                 jtag_execute_queue();
 434                 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 435         }
 436
 437         arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
 438         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
 439         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
 440
 441         /* save i/d fault status and address register */
 442         arm926ejs->read_cp15(target, 0, 0, 5, 0, &arm926ejs->d_fsr);
 443         arm926ejs->read_cp15(target, 0, 1, 5, 0, &arm926ejs->i_fsr);
 444         arm926ejs->read_cp15(target, 0, 0, 6, 0, &arm926ejs->d_far);
 445
 446         LOG_DEBUG("D FSR: 0x%8.8" PRIx32 ", D FAR: 0x%8.8" PRIx32 ", I FSR: 0x%8.8" PRIx32 "",
 447                 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
 448
 449         uint32_t cache_dbg_ctrl;
 450
 451         /* read-modify-write CP15 cache debug control register
 452          * to disable I/D-cache linefills and force WT */
 453         arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
 454         cache_dbg_ctrl |= 0x7;
 455         arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
 456 }
 457
 458 static void arm926ejs_pre_restore_context(struct target *target)
 459 {
 460         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 461
 462         /* restore i/d fault status and address register */
 463         arm926ejs->write_cp15(target, 0, 0, 5, 0, arm926ejs->d_fsr);
 464         arm926ejs->write_cp15(target, 0, 1, 5, 0, arm926ejs->i_fsr);
 465         arm926ejs->write_cp15(target, 0, 0, 6, 0, arm926ejs->d_far);
 466
 467         uint32_t cache_dbg_ctrl;
 468
 469         /* read-modify-write CP15 cache debug control register
 470          * to reenable I/D-cache linefills and disable WT */
 471         arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
 472         cache_dbg_ctrl &= ~0x7;
 473         arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
 474 }
 475
 476 static const char arm926_not[] = "target is not an ARM926";
 477
 478 static int arm926ejs_verify_pointer(struct command_context *cmd_ctx,
 479                 struct arm926ejs_common *arm926)
 480 {
 481         if (arm926->common_magic != ARM926EJS_COMMON_MAGIC) {
 482                 command_print(cmd_ctx, arm926_not);
 483                 return ERROR_TARGET_INVALID;
 484         }
 485         return ERROR_OK;
 486 }
 487
 488 /** Logs summary of ARM926 state for a halted target. */
 489 int arm926ejs_arch_state(struct target *target)
 490 {
 491         static const char *state[] =
 492         {
 493                 "disabled", "enabled"
 494         };
 495
 496         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 497         struct armv4_5_common_s *armv4_5;
 498
 499         if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC)
 500         {
 501                 LOG_ERROR("BUG: %s", arm926_not);
 502                 return ERROR_TARGET_INVALID;
 503         }
 504
 505         armv4_5 = &arm926ejs->arm7_9_common.armv4_5_common;
 506
 507         LOG_USER("target halted in %s state due to %s, current mode: %s\n"
 508                         "cpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "\n"
 509                         "MMU: %s, D-Cache: %s, I-Cache: %s",
 510                          armv4_5_state_strings[armv4_5->core_state],
 511                          Jim_Nvp_value2name_simple(nvp_target_debug_reason,target->debug_reason)->name,
 512                          armv4_5_mode_strings[armv4_5_mode_to_number(armv4_5->core_mode)],
 513                          buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 514                          buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 515                          state[arm926ejs->armv4_5_mmu.mmu_enabled],
 516                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 517                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 518
 519         return ERROR_OK;
 520 }
 521
 522 int arm926ejs_soft_reset_halt(struct target *target)
 523 {
 524         int retval = ERROR_OK;
 525         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 526         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 527         struct armv4_5_common_s *armv4_5 = &arm7_9->armv4_5_common;
 528         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 529
 530         if ((retval = target_halt(target)) != ERROR_OK)
 531         {
 532                 return retval;
 533         }
 534
 535         long long then = timeval_ms();
 536         int timeout;
 537         while (!(timeout = ((timeval_ms()-then) > 1000)))
 538         {
 539                 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 540                 {
 541                         embeddedice_read_reg(dbg_stat);
 542                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 543                         {
 544                                 return retval;
 545                         }
 546                 }  else
 547                 {
 548                         break;
 549                 }
 550                 if (debug_level >= 1)
 551                 {
 552                         /* do not eat all CPU, time out after 1 se*/
 553                         alive_sleep(100);
 554                 } else
 555                 {
 556                         keep_alive();
 557                 }
 558         }
 559         if (timeout)
 560         {
 561                 LOG_ERROR("Failed to halt CPU after 1 sec");
 562                 return ERROR_TARGET_TIMEOUT;
 563         }
 564
 565         target->state = TARGET_HALTED;
 566
 567         /* SVC, ARM state, IRQ and FIQ disabled */
 568         buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8, 0xd3);
 569         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 570         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 571
 572         /* start fetching from 0x0 */
 573         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, 0x0);
 574         armv4_5->core_cache->reg_list[15].dirty = 1;
 575         armv4_5->core_cache->reg_list[15].valid = 1;
 576
 577         armv4_5->core_mode = ARMV4_5_MODE_SVC;
 578         armv4_5->core_state = ARMV4_5_STATE_ARM;
 579
 580         arm926ejs_disable_mmu_caches(target, 1, 1, 1);
 581         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 582         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
 583         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 584
 585         return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 586 }
 587
 588 /** Writes a buffer, in the specified word size, with current MMU settings. */
 589 int arm926ejs_write_memory(struct target *target, uint32_t address,
 590                 uint32_t size, uint32_t count, uint8_t *buffer)
 591 {
 592         int retval;
 593         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 594
 595         /* FIX!!!! this should be cleaned up and made much more general. The
 596          * plan is to write up and test on arm926ejs specifically and
 597          * then generalize and clean up afterwards. */
 598         if (arm926ejs->armv4_5_mmu.mmu_enabled && (count == 1) && ((size==2) || (size==4)))
 599         {
 600                 /* special case the handling of single word writes to bypass MMU
 601                  * to allow implementation of breakpoints in memory marked read only
 602                  * by MMU */
 603                 if (arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 604                 {
 605                         /* flush and invalidate data cache
 606                          *
 607                          * MCR p15,0,p,c7,c10,1 - clean cache line using virtual address
 608                          *
 609                          */
 610                         retval = arm926ejs->write_cp15(target, 0, 1, 7, 10, address&~0x3);
 611                         if (retval != ERROR_OK)
 612                                 return retval;
 613                 }
 614
 615                 uint32_t pa;
 616                 retval = target->type->virt2phys(target, address, &pa);
 617                 if (retval != ERROR_OK)
 618                         return retval;
 619
 620                 /* write directly to physical memory bypassing any read only MMU bits, etc. */
 621                 retval = armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu, pa, size, count, buffer);
 622                 if (retval != ERROR_OK)
 623                         return retval;
 624         } else
 625         {
 626                 if ((retval = arm7_9_write_memory(target, address, size, count, buffer)) != ERROR_OK)
 627                         return retval;
 628         }
 629
 630         /* If ICache is enabled, we have to invalidate affected ICache lines
 631          * the DCache is forced to write-through, so we don't have to clean it here
 632          */
 633         if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
 634         {
 635                 if (count <= 1)
 636                 {
 637                         /* invalidate ICache single entry with MVA */
 638                         arm926ejs->write_cp15(target, 0, 1, 7, 5, address);
 639                 }
 640                 else
 641                 {
 642                         /* invalidate ICache */
 643                         arm926ejs->write_cp15(target, 0, 0, 7, 5, address);
 644                 }
 645         }
 646
 647         return retval;
 648 }
 649
 650 static int arm926ejs_write_phys_memory(struct target *target,
 651                 uint32_t address, uint32_t size,
 652                 uint32_t count, uint8_t *buffer)
 653 {
 654         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 655
 656         return armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu,
 657                         address, size, count, buffer);
 658 }
 659
 660 static int arm926ejs_read_phys_memory(struct target *target,
 661                 uint32_t address, uint32_t size,
 662                 uint32_t count, uint8_t *buffer)
 663 {
 664         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 665
 666         return armv4_5_mmu_read_physical(target, &arm926ejs->armv4_5_mmu,
 667                         address, size, count, buffer);
 668 }
 669
 670 int arm926ejs_init_arch_info(struct target *target, struct arm926ejs_common *arm926ejs,
 671                 struct jtag_tap *tap)
 672 {
 673         struct arm7_9_common *arm7_9 = &arm926ejs->arm7_9_common;
 674
 675         /* initialize arm7/arm9 specific info (including armv4_5) */
 676         arm9tdmi_init_arch_info(target, arm7_9, tap);
 677
 678         arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
 679
 680         arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
 681         arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
 682
 683         arm926ejs->read_cp15 = arm926ejs_cp15_read;
 684         arm926ejs->write_cp15 = arm926ejs_cp15_write;
 685         arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
 686         arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
 687         arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
 688         arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
 689         arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
 690         arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
 691         arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
 692         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 693
 694         arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
 695
 696         /* The ARM926EJ-S implements the ARMv5TE architecture which
 697          * has the BKPT instruction, so we don't have to use a watchpoint comparator
 698          */
 699         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
 700         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
 701
 702         return ERROR_OK;
 703 }
 704
 705 static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
 706 {
 707         struct arm926ejs_common *arm926ejs = calloc(1,sizeof(struct arm926ejs_common));
 708
 709         /* ARM9EJ-S core always reports 0x1 in Capture-IR */
 710         target->tap->ir_capture_mask = 0x0f;
 711
 712         return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
 713 }
 714
 715 COMMAND_HANDLER(arm926ejs_handle_cp15_command)
 716 {
 717         int retval;
 718         struct target *target = get_current_target(cmd_ctx);
 719         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 720         int opcode_1;
 721         int opcode_2;
 722         int CRn;
 723         int CRm;
 724
 725         if ((CMD_ARGC < 4) || (CMD_ARGC > 5))
 726         {
 727                 command_print(cmd_ctx, "usage: arm926ejs cp15 <opcode_1> <opcode_2> <CRn> <CRm> [value]");
 728                 return ERROR_OK;
 729         }
 730
 731         COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], opcode_1);
 732         COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], opcode_2);
 733         COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], CRn);
 734         COMMAND_PARSE_NUMBER(int, CMD_ARGV[3], CRm);
 735
 736         retval = arm926ejs_verify_pointer(cmd_ctx, arm926ejs);
 737         if (retval != ERROR_OK)
 738                 return retval;
 739
 740         if (target->state != TARGET_HALTED)
 741         {
 742                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", CMD_NAME);
 743                 return ERROR_OK;
 744         }
 745
 746         if (CMD_ARGC == 4)
 747         {
 748                 uint32_t value;
 749                 if ((retval = arm926ejs->read_cp15(target, opcode_1, opcode_2, CRn, CRm, &value)) != ERROR_OK)
 750                 {
 751                         command_print(cmd_ctx, "couldn't access register");
 752                         return ERROR_OK;
 753                 }
 754                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 755                 {
 756                         return retval;
 757                 }
 758
 759                 command_print(cmd_ctx, "%i %i %i %i: %8.8" PRIx32 "", opcode_1, opcode_2, CRn, CRm, value);
 760         }
 761         else
 762         {
 763                 uint32_t value;
 764                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[4], value);
 765                 if ((retval = arm926ejs->write_cp15(target, opcode_1, opcode_2, CRn, CRm, value)) != ERROR_OK)
 766                 {
 767                         command_print(cmd_ctx, "couldn't access register");
 768                         return ERROR_OK;
 769                 }
 770                 command_print(cmd_ctx, "%i %i %i %i: %8.8" PRIx32 "", opcode_1, opcode_2, CRn, CRm, value);
 771         }
 772
 773         return ERROR_OK;
 774 }
 775
 776 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
 777 {
 778         int retval;
 779         struct target *target = get_current_target(cmd_ctx);
 780         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 781
 782         retval = arm926ejs_verify_pointer(cmd_ctx, arm926ejs);
 783         if (retval != ERROR_OK)
 784                 return retval;
 785
 786         return armv4_5_handle_cache_info_command(cmd_ctx, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 787 }
 788
 789 static int arm926ejs_virt2phys(struct target *target, uint32_t virtual, uint32_t *physical)
 790 {
 791         int type;
 792         uint32_t cb;
 793         int domain;
 794         uint32_t ap;
 795         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 796
 797         uint32_t ret = armv4_5_mmu_translate_va(target, &arm926ejs->armv4_5_mmu, virtual, &type, &cb, &domain, &ap);
 798         if (type == -1)
 799         {
 800                 return ret;
 801         }
 802         *physical = ret;
 803         return ERROR_OK;
 804 }
 805
 806 static int arm926ejs_mmu(struct target *target, int *enabled)
 807 {
 808         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 809
 810         if (target->state != TARGET_HALTED)
 811         {
 812                 LOG_ERROR("Target not halted");
 813                 return ERROR_TARGET_INVALID;
 814         }
 815         *enabled = arm926ejs->armv4_5_mmu.mmu_enabled;
 816         return ERROR_OK;
 817 }
 818
 819 /** Registers commands to access coprocessor, cache, and debug resources.  */
 820 int arm926ejs_register_commands(struct command_context *cmd_ctx)
 821 {
 822         int retval;
 823         struct command *arm926ejs_cmd;
 824
 825         retval = arm9tdmi_register_commands(cmd_ctx);
 826
 827         arm926ejs_cmd = register_command(cmd_ctx, NULL, "arm926ejs",
 828                 NULL, COMMAND_ANY,
 829                 "arm926ejs specific commands");
 830
 831         register_command(cmd_ctx, arm926ejs_cmd, "cp15",
 832                 arm926ejs_handle_cp15_command, COMMAND_EXEC,
 833                 "display/modify cp15 register "
 834                 "<opcode_1> <opcode_2> <CRn> <CRm> [value]");
 835
 836         register_command(cmd_ctx, arm926ejs_cmd, "cache_info",
 837                 arm926ejs_handle_cache_info_command, COMMAND_EXEC,
 838                 "display information about target caches");
 839
 840         return retval;
 841 }
 842
 843 /** Holds methods for ARM926 targets. */
 844 struct target_type arm926ejs_target =
 845 {
 846         .name = "arm926ejs",
 847
 848         .poll = arm7_9_poll,
 849         .arch_state = arm926ejs_arch_state,
 850
 851         .target_request_data = arm7_9_target_request_data,
 852
 853         .halt = arm7_9_halt,
 854         .resume = arm7_9_resume,
 855         .step = arm7_9_step,
 856
 857         .assert_reset = arm7_9_assert_reset,
 858         .deassert_reset = arm7_9_deassert_reset,
 859         .soft_reset_halt = arm926ejs_soft_reset_halt,
 860
 861         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
 862
 863         .read_memory = arm7_9_read_memory,
 864         .write_memory = arm926ejs_write_memory,
 865         .bulk_write_memory = arm7_9_bulk_write_memory,
 866
 867         .checksum_memory = arm_checksum_memory,
 868         .blank_check_memory = arm_blank_check_memory,
 869
 870         .run_algorithm = armv4_5_run_algorithm,
 871
 872         .add_breakpoint = arm7_9_add_breakpoint,
 873         .remove_breakpoint = arm7_9_remove_breakpoint,
 874         .add_watchpoint = arm7_9_add_watchpoint,
 875         .remove_watchpoint = arm7_9_remove_watchpoint,
 876
 877         .register_commands = arm926ejs_register_commands,
 878         .target_create = arm926ejs_target_create,
 879         .init_target = arm9tdmi_init_target,
 880         .examine = arm7_9_examine,
 881         .virt2phys = arm926ejs_virt2phys,
 882         .mmu = arm926ejs_mmu,
 883
 884         .read_phys_memory = arm926ejs_read_phys_memory,
 885         .write_phys_memory = arm926ejs_write_phys_memory,
 886         .mrc = arm926ejs_mrc,
 887         .mcr = arm926ejs_mcr,
 888 };