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 <helper/time_support.h>
  29 #include "target_type.h"
  30 #include "register.h"
  31 #include "arm_opcodes.h"
  32
  33
  34 /*
  35  * The ARM926 is built around the ARM9EJ-S core, and most JTAG docs
  36  * are in the ARM9EJ-S Technical Reference Manual (ARM DDI 0222B) not
  37  * the ARM926 manual (ARM DDI 0198E).  The scan chains are:
  38  *
  39  *   1 ... core debugging
  40  *   2 ... EmbeddedICE
  41  *   3 ... external boundary scan (SoC-specific, unused here)
  42  *   6 ... ETM
  43  *   15 ... coprocessor 15
  44  */
  45
  46 #if 0
  47 #define _DEBUG_INSTRUCTION_EXECUTION_
  48 #endif
  49
  50 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
  51
  52 static int arm926ejs_cp15_read(struct target *target, uint32_t op1, uint32_t op2,
  53                 uint32_t CRn, uint32_t CRm, uint32_t *value)
  54 {
  55         int retval = ERROR_OK;
  56         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  57         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
  58         uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
  59         struct scan_field fields[4];
  60         uint8_t address_buf[2] = {0, 0};
  61         uint8_t nr_w_buf = 0;
  62         uint8_t access_t = 1;
  63
  64         buf_set_u32(address_buf, 0, 14, address);
  65
  66         if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
  67         {
  68                 return retval;
  69         }
  70         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
  71         if (retval != ERROR_OK)
  72                 return retval;
  73
  74         fields[0].num_bits = 32;
  75         fields[0].out_value = NULL;
  76         fields[0].in_value = (uint8_t *)value;
  77
  78         fields[1].num_bits = 1;
  79         fields[1].out_value = &access_t;
  80         fields[1].in_value = &access_t;
  81
  82         fields[2].num_bits = 14;
  83         fields[2].out_value = address_buf;
  84         fields[2].in_value = NULL;
  85
  86         fields[3].num_bits = 1;
  87         fields[3].out_value = &nr_w_buf;
  88         fields[3].in_value = NULL;
  89
  90         jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
  91
  92         long long then = timeval_ms();
  93
  94         for (;;)
  95         {
  96                 /* rescan with NOP, to wait for the access to complete */
  97                 access_t = 0;
  98                 nr_w_buf = 0;
  99                 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
 100
 101                 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 102
 103                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 104                 {
 105                         return retval;
 106                 }
 107
 108                 if (buf_get_u32(&access_t, 0, 1) == 1)
 109                 {
 110                         break;
 111                 }
 112
 113                 /* 10ms timeout */
 114                 if ((timeval_ms()-then)>10)
 115                 {
 116                         LOG_ERROR("cp15 read operation timed out");
 117                         return ERROR_FAIL;
 118                 }
 119         }
 120
 121 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 122         LOG_DEBUG("addr: 0x%x value: %8.8x", address, *value);
 123 #endif
 124
 125         retval = arm_jtag_set_instr(jtag_info, 0xc, NULL, TAP_IDLE);
 126         if (retval != ERROR_OK)
 127                 return retval;
 128
 129         return ERROR_OK;
 130 }
 131
 132 static int arm926ejs_mrc(struct target *target, int cpnum, uint32_t op1,
 133                 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
 134 {
 135         if (cpnum != 15) {
 136                 LOG_ERROR("Only cp15 is supported");
 137                 return ERROR_FAIL;
 138         }
 139         return arm926ejs_cp15_read(target, op1, op2, CRn, CRm, value);
 140 }
 141
 142 static int arm926ejs_cp15_write(struct target *target, uint32_t op1, uint32_t op2,
 143                 uint32_t CRn, uint32_t CRm, uint32_t value)
 144 {
 145         int retval = ERROR_OK;
 146         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 147         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 148         uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
 149         struct scan_field fields[4];
 150         uint8_t value_buf[4];
 151         uint8_t address_buf[2] = {0, 0};
 152         uint8_t nr_w_buf = 1;
 153         uint8_t access_t = 1;
 154
 155         buf_set_u32(address_buf, 0, 14, address);
 156         buf_set_u32(value_buf, 0, 32, value);
 157
 158         if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
 159         {
 160                 return retval;
 161         }
 162         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
 163         if (retval != ERROR_OK)
 164                 return retval;
 165
 166         fields[0].num_bits = 32;
 167         fields[0].out_value = value_buf;
 168         fields[0].in_value = NULL;
 169
 170         fields[1].num_bits = 1;
 171         fields[1].out_value = &access_t;
 172         fields[1].in_value = &access_t;
 173
 174         fields[2].num_bits = 14;
 175         fields[2].out_value = address_buf;
 176         fields[2].in_value = NULL;
 177
 178         fields[3].num_bits = 1;
 179         fields[3].out_value = &nr_w_buf;
 180         fields[3].in_value = NULL;
 181
 182         jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
 183
 184         long long then = timeval_ms();
 185
 186         for (;;)
 187         {
 188                 /* rescan with NOP, to wait for the access to complete */
 189                 access_t = 0;
 190                 nr_w_buf = 0;
 191                 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
 192                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 193                 {
 194                         return retval;
 195                 }
 196
 197                 if (buf_get_u32(&access_t, 0, 1) == 1)
 198                 {
 199                         break;
 200                 }
 201
 202                 /* 10ms timeout */
 203                 if ((timeval_ms()-then)>10)
 204                 {
 205                         LOG_ERROR("cp15 write operation timed out");
 206                         return ERROR_FAIL;
 207                 }
 208         }
 209
 210 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 211         LOG_DEBUG("addr: 0x%x value: %8.8x", address, value);
 212 #endif
 213
 214         retval = arm_jtag_set_instr(jtag_info, 0xf, NULL, TAP_IDLE);
 215         if (retval != ERROR_OK)
 216                 return retval;
 217
 218         return ERROR_OK;
 219 }
 220
 221 static int arm926ejs_mcr(struct target *target, int cpnum, uint32_t op1,
 222                 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
 223 {
 224         if (cpnum != 15) {
 225                 LOG_ERROR("Only cp15 is supported");
 226                 return ERROR_FAIL;
 227         }
 228         return arm926ejs_cp15_write(target, op1, op2, CRn, CRm, value);
 229 }
 230
 231 static int arm926ejs_examine_debug_reason(struct target *target)
 232 {
 233         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 234         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 235         int debug_reason;
 236         int retval;
 237
 238         embeddedice_read_reg(dbg_stat);
 239         if ((retval = jtag_execute_queue()) != ERROR_OK)
 240                 return retval;
 241
 242         /* Method-Of-Entry (MOE) field */
 243         debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
 244
 245         switch (debug_reason)
 246         {
 247                 case 0:
 248                         LOG_DEBUG("no *NEW* debug entry (?missed one?)");
 249                         /* ... since last restart or debug reset ... */
 250                         target->debug_reason = DBG_REASON_DBGRQ;
 251                         break;
 252                 case 1:
 253                         LOG_DEBUG("breakpoint from EICE unit 0");
 254                         target->debug_reason = DBG_REASON_BREAKPOINT;
 255                         break;
 256                 case 2:
 257                         LOG_DEBUG("breakpoint from EICE unit 1");
 258                         target->debug_reason = DBG_REASON_BREAKPOINT;
 259                         break;
 260                 case 3:
 261                         LOG_DEBUG("soft breakpoint (BKPT instruction)");
 262                         target->debug_reason = DBG_REASON_BREAKPOINT;
 263                         break;
 264                 case 4:
 265                         LOG_DEBUG("vector catch breakpoint");
 266                         target->debug_reason = DBG_REASON_BREAKPOINT;
 267                         break;
 268                 case 5:
 269                         LOG_DEBUG("external breakpoint");
 270                         target->debug_reason = DBG_REASON_BREAKPOINT;
 271                         break;
 272                 case 6:
 273                         LOG_DEBUG("watchpoint from EICE unit 0");
 274                         target->debug_reason = DBG_REASON_WATCHPOINT;
 275                         break;
 276                 case 7:
 277                         LOG_DEBUG("watchpoint from EICE unit 1");
 278                         target->debug_reason = DBG_REASON_WATCHPOINT;
 279                         break;
 280                 case 8:
 281                         LOG_DEBUG("external watchpoint");
 282                         target->debug_reason = DBG_REASON_WATCHPOINT;
 283                         break;
 284                 case 9:
 285                         LOG_DEBUG("internal debug request");
 286                         target->debug_reason = DBG_REASON_DBGRQ;
 287                         break;
 288                 case 10:
 289                         LOG_DEBUG("external debug request");
 290                         target->debug_reason = DBG_REASON_DBGRQ;
 291                         break;
 292                 case 11:
 293                         LOG_DEBUG("debug re-entry from system speed access");
 294                         /* This is normal when connecting to something that's
 295                          * already halted, or in some related code paths, but
 296                          * otherwise is surprising (and presumably wrong).
 297                          */
 298                         switch (target->debug_reason) {
 299                         case DBG_REASON_DBGRQ:
 300                                 break;
 301                         default:
 302                                 LOG_ERROR("unexpected -- debug re-entry");
 303                                 /* FALLTHROUGH */
 304                         case DBG_REASON_UNDEFINED:
 305                                 target->debug_reason = DBG_REASON_DBGRQ;
 306                                 break;
 307                         }
 308                         break;
 309                 case 12:
 310                         /* FIX!!!! here be dragons!!! We need to fail here so
 311                          * the target will interpreted as halted but we won't
 312                          * try to talk to it right now... a resume + halt seems
 313                          * to sync things up again. Please send an email to
 314                          * openocd development mailing list if you have hardware
 315                          * to donate to look into this problem....
 316                          */
 317                         LOG_WARNING("WARNING: mystery debug reason MOE = 0xc. Try issuing a resume + halt.");
 318                         target->debug_reason = DBG_REASON_DBGRQ;
 319                         break;
 320                 default:
 321                         LOG_WARNING("WARNING: unknown debug reason: 0x%x", debug_reason);
 322                         /* Oh agony! should we interpret this as a halt request or
 323                          * that the target stopped on it's own accord?
 324                          */
 325                         target->debug_reason = DBG_REASON_DBGRQ;
 326                         /* if we fail here, we won't talk to the target and it will
 327                          * be reported to be in the halted state */
 328                         break;
 329         }
 330
 331         return ERROR_OK;
 332 }
 333
 334 static int arm926ejs_get_ttb(struct target *target, uint32_t *result)
 335 {
 336         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 337         int retval;
 338         uint32_t ttb = 0x0;
 339
 340         if ((retval = arm926ejs->read_cp15(target, 0, 0, 2, 0, &ttb)) != ERROR_OK)
 341                 return retval;
 342
 343         *result = ttb;
 344
 345         return ERROR_OK;
 346 }
 347
 348 static int 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         int retval;
 354
 355         /* read cp15 control register */
 356         retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
 357         if (retval != ERROR_OK)
 358                 return retval;
 359         retval = jtag_execute_queue();
 360         if (retval != ERROR_OK)
 361                 return retval;
 362
 363         if (mmu)
 364         {
 365                 /* invalidate TLB */
 366                 retval = arm926ejs->write_cp15(target, 0, 0, 8, 7, 0x0);
 367                 if (retval != ERROR_OK)
 368                         return retval;
 369
 370                 cp15_control &= ~0x1U;
 371         }
 372
 373         if (d_u_cache)
 374         {
 375                 uint32_t debug_override;
 376                 /* read-modify-write CP15 debug override register
 377                  * to enable "test and clean all" */
 378                 retval = arm926ejs->read_cp15(target, 0, 0, 15, 0, &debug_override);
 379                 if (retval != ERROR_OK)
 380                         return retval;
 381                 debug_override |= 0x80000;
 382                 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
 383                 if (retval != ERROR_OK)
 384                         return retval;
 385
 386                 /* clean and invalidate DCache */
 387                 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
 388                 if (retval != ERROR_OK)
 389                         return retval;
 390
 391                 /* write CP15 debug override register
 392                  * to disable "test and clean all" */
 393                 debug_override &= ~0x80000;
 394                 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
 395                 if (retval != ERROR_OK)
 396                         return retval;
 397
 398                 cp15_control &= ~0x4U;
 399         }
 400
 401         if (i_cache)
 402         {
 403                 /* invalidate ICache */
 404                 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
 405                 if (retval != ERROR_OK)
 406                         return retval;
 407
 408                 cp15_control &= ~0x1000U;
 409         }
 410
 411         retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
 412         return retval;
 413 }
 414
 415 static int arm926ejs_enable_mmu_caches(struct target *target, int mmu,
 416                 int d_u_cache, int i_cache)
 417 {
 418         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 419         uint32_t cp15_control;
 420         int retval;
 421
 422         /* read cp15 control register */
 423         retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
 424         if (retval != ERROR_OK)
 425                 return retval;
 426         retval = jtag_execute_queue();
 427         if (retval != ERROR_OK)
 428                 return retval;
 429
 430         if (mmu)
 431                 cp15_control |= 0x1U;
 432
 433         if (d_u_cache)
 434                 cp15_control |= 0x4U;
 435
 436         if (i_cache)
 437                 cp15_control |= 0x1000U;
 438
 439         retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
 440         return retval;
 441 }
 442
 443 static int arm926ejs_post_debug_entry(struct target *target)
 444 {
 445         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 446         int retval;
 447
 448         /* examine cp15 control reg */
 449         retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &arm926ejs->cp15_control_reg);
 450         if (retval != ERROR_OK)
 451                 return retval;
 452         retval = jtag_execute_queue();
 453         if (retval != ERROR_OK)
 454                 return retval;
 455         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm926ejs->cp15_control_reg);
 456
 457         if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1)
 458         {
 459                 uint32_t cache_type_reg;
 460                 /* identify caches */
 461                 retval = arm926ejs->read_cp15(target, 0, 1, 0, 0, &cache_type_reg);
 462                 if (retval != ERROR_OK)
 463                         return retval;
 464                 retval = jtag_execute_queue();
 465                 if (retval != ERROR_OK)
 466                         return retval;
 467                 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 468         }
 469
 470         arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
 471         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
 472         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
 473
 474         /* save i/d fault status and address register */
 475         retval = arm926ejs->read_cp15(target, 0, 0, 5, 0, &arm926ejs->d_fsr);
 476         if (retval != ERROR_OK)
 477                 return retval;
 478         retval = arm926ejs->read_cp15(target, 0, 1, 5, 0, &arm926ejs->i_fsr);
 479         if (retval != ERROR_OK)
 480                 return retval;
 481         retval = arm926ejs->read_cp15(target, 0, 0, 6, 0, &arm926ejs->d_far);
 482         if (retval != ERROR_OK)
 483                 return retval;
 484
 485         LOG_DEBUG("D FSR: 0x%8.8" PRIx32 ", D FAR: 0x%8.8" PRIx32 ", I FSR: 0x%8.8" PRIx32 "",
 486                 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
 487
 488         uint32_t cache_dbg_ctrl;
 489
 490         /* read-modify-write CP15 cache debug control register
 491          * to disable I/D-cache linefills and force WT */
 492         retval = arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
 493         if (retval != ERROR_OK)
 494                 return retval;
 495         cache_dbg_ctrl |= 0x7;
 496         retval = arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
 497         return retval;
 498 }
 499
 500 static void arm926ejs_pre_restore_context(struct target *target)
 501 {
 502         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 503
 504         /* restore i/d fault status and address register */
 505         arm926ejs->write_cp15(target, 0, 0, 5, 0, arm926ejs->d_fsr);
 506         arm926ejs->write_cp15(target, 0, 1, 5, 0, arm926ejs->i_fsr);
 507         arm926ejs->write_cp15(target, 0, 0, 6, 0, arm926ejs->d_far);
 508
 509         uint32_t cache_dbg_ctrl;
 510
 511         /* read-modify-write CP15 cache debug control register
 512          * to reenable I/D-cache linefills and disable WT */
 513         arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
 514         cache_dbg_ctrl &= ~0x7;
 515         arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
 516 }
 517
 518 static const char arm926_not[] = "target is not an ARM926";
 519
 520 static int arm926ejs_verify_pointer(struct command_context *cmd_ctx,
 521                 struct arm926ejs_common *arm926)
 522 {
 523         if (arm926->common_magic != ARM926EJS_COMMON_MAGIC) {
 524                 command_print(cmd_ctx, arm926_not);
 525                 return ERROR_TARGET_INVALID;
 526         }
 527         return ERROR_OK;
 528 }
 529
 530 /** Logs summary of ARM926 state for a halted target. */
 531 int arm926ejs_arch_state(struct target *target)
 532 {
 533         static const char *state[] =
 534         {
 535                 "disabled", "enabled"
 536         };
 537
 538         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 539
 540         if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC)
 541         {
 542                 LOG_ERROR("BUG: %s", arm926_not);
 543                 return ERROR_TARGET_INVALID;
 544         }
 545
 546         arm_arch_state(target);
 547         LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s",
 548                          state[arm926ejs->armv4_5_mmu.mmu_enabled],
 549                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 550                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 551
 552         return ERROR_OK;
 553 }
 554
 555 int arm926ejs_soft_reset_halt(struct target *target)
 556 {
 557         int retval = ERROR_OK;
 558         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 559         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 560         struct arm *armv4_5 = &arm7_9->armv4_5_common;
 561         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 562
 563         if ((retval = target_halt(target)) != ERROR_OK)
 564         {
 565                 return retval;
 566         }
 567
 568         long long then = timeval_ms();
 569         int timeout;
 570         while (!(timeout = ((timeval_ms()-then) > 1000)))
 571         {
 572                 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 573                 {
 574                         embeddedice_read_reg(dbg_stat);
 575                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 576                         {
 577                                 return retval;
 578                         }
 579                 }  else
 580                 {
 581                         break;
 582                 }
 583                 if (debug_level >= 1)
 584                 {
 585                         /* do not eat all CPU, time out after 1 se*/
 586                         alive_sleep(100);
 587                 } else
 588                 {
 589                         keep_alive();
 590                 }
 591         }
 592         if (timeout)
 593         {
 594                 LOG_ERROR("Failed to halt CPU after 1 sec");
 595                 return ERROR_TARGET_TIMEOUT;
 596         }
 597
 598         target->state = TARGET_HALTED;
 599
 600         /* SVC, ARM state, IRQ and FIQ disabled */
 601         uint32_t cpsr;
 602
 603         cpsr = buf_get_u32(armv4_5->cpsr->value, 0, 32);
 604         cpsr &= ~0xff;
 605         cpsr |= 0xd3;
 606         arm_set_cpsr(armv4_5, cpsr);
 607         armv4_5->cpsr->dirty = 1;
 608
 609         /* start fetching from 0x0 */
 610         buf_set_u32(armv4_5->pc->value, 0, 32, 0x0);
 611         armv4_5->pc->dirty = 1;
 612         armv4_5->pc->valid = 1;
 613
 614         retval = arm926ejs_disable_mmu_caches(target, 1, 1, 1);
 615         if (retval != ERROR_OK)
 616                 return retval;
 617         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 618         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
 619         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 620
 621         return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 622 }
 623
 624 /** Writes a buffer, in the specified word size, with current MMU settings. */
 625 int arm926ejs_write_memory(struct target *target, uint32_t address,
 626                 uint32_t size, uint32_t count, const uint8_t *buffer)
 627 {
 628         int retval;
 629         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 630
 631         /* FIX!!!! this should be cleaned up and made much more general. The
 632          * plan is to write up and test on arm926ejs specifically and
 633          * then generalize and clean up afterwards.
 634          *
 635          *
 636          * Also it should be moved to the callbacks that handle breakpoints
 637          * specifically and not the generic memory write fn's. See XScale code.
 638          **/
 639         if (arm926ejs->armv4_5_mmu.mmu_enabled && (count == 1) && ((size==2) || (size==4)))
 640         {
 641                 /* special case the handling of single word writes to bypass MMU
 642                  * to allow implementation of breakpoints in memory marked read only
 643                  * by MMU */
 644                 if (arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 645                 {
 646                         /* flush and invalidate data cache
 647                          *
 648                          * MCR p15,0,p,c7,c10,1 - clean cache line using virtual address
 649                          *
 650                          */
 651                         retval = arm926ejs->write_cp15(target, 0, 1, 7, 10, address&~0x3);
 652                         if (retval != ERROR_OK)
 653                                 return retval;
 654                 }
 655
 656                 uint32_t pa;
 657                 retval = target->type->virt2phys(target, address, &pa);
 658                 if (retval != ERROR_OK)
 659                         return retval;
 660
 661                 /* write directly to physical memory bypassing any read only MMU bits, etc. */
 662                 retval = armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu, pa, size, count, buffer);
 663                 if (retval != ERROR_OK)
 664                         return retval;
 665         } else
 666         {
 667                 if ((retval = arm7_9_write_memory(target, address, size, count, buffer)) != ERROR_OK)
 668                         return retval;
 669         }
 670
 671         /* If ICache is enabled, we have to invalidate affected ICache lines
 672          * the DCache is forced to write-through, so we don't have to clean it here
 673          */
 674         if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
 675         {
 676                 if (count <= 1)
 677                 {
 678                         /* invalidate ICache single entry with MVA */
 679                         arm926ejs->write_cp15(target, 0, 1, 7, 5, address);
 680                 }
 681                 else
 682                 {
 683                         /* invalidate ICache */
 684                         arm926ejs->write_cp15(target, 0, 0, 7, 5, address);
 685                 }
 686         }
 687
 688         return retval;
 689 }
 690
 691 static int arm926ejs_write_phys_memory(struct target *target,
 692                 uint32_t address, uint32_t size,
 693                 uint32_t count, const uint8_t *buffer)
 694 {
 695         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 696
 697         return armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu,
 698                         address, size, count, buffer);
 699 }
 700
 701 static int arm926ejs_read_phys_memory(struct target *target,
 702                 uint32_t address, uint32_t size,
 703                 uint32_t count, uint8_t *buffer)
 704 {
 705         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 706
 707         return armv4_5_mmu_read_physical(target, &arm926ejs->armv4_5_mmu,
 708                         address, size, count, buffer);
 709 }
 710
 711 int arm926ejs_init_arch_info(struct target *target, struct arm926ejs_common *arm926ejs,
 712                 struct jtag_tap *tap)
 713 {
 714         struct arm7_9_common *arm7_9 = &arm926ejs->arm7_9_common;
 715
 716         arm7_9->armv4_5_common.mrc = arm926ejs_mrc;
 717         arm7_9->armv4_5_common.mcr = arm926ejs_mcr;
 718
 719         /* initialize arm7/arm9 specific info (including armv4_5) */
 720         arm9tdmi_init_arch_info(target, arm7_9, tap);
 721
 722         arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
 723
 724         arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
 725         arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
 726
 727         arm926ejs->read_cp15 = arm926ejs_cp15_read;
 728         arm926ejs->write_cp15 = arm926ejs_cp15_write;
 729         arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
 730         arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
 731         arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
 732         arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
 733         arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
 734         arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
 735         arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
 736         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 737
 738         arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
 739
 740         /* The ARM926EJ-S implements the ARMv5TE architecture which
 741          * has the BKPT instruction, so we don't have to use a watchpoint comparator
 742          */
 743         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
 744         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
 745
 746         return ERROR_OK;
 747 }
 748
 749 static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
 750 {
 751         struct arm926ejs_common *arm926ejs = calloc(1,sizeof(struct arm926ejs_common));
 752
 753         /* ARM9EJ-S core always reports 0x1 in Capture-IR */
 754         target->tap->ir_capture_mask = 0x0f;
 755
 756         return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
 757 }
 758
 759 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
 760 {
 761         int retval;
 762         struct target *target = get_current_target(CMD_CTX);
 763         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 764
 765         retval = arm926ejs_verify_pointer(CMD_CTX, arm926ejs);
 766         if (retval != ERROR_OK)
 767                 return retval;
 768
 769         return armv4_5_handle_cache_info_command(CMD_CTX, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 770 }
 771
 772 static int arm926ejs_virt2phys(struct target *target, uint32_t virtual, uint32_t *physical)
 773 {
 774         uint32_t cb;
 775         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 776
 777         uint32_t ret;
 778         int retval = armv4_5_mmu_translate_va(target, &arm926ejs->armv4_5_mmu,
 779                         virtual, &cb, &ret);
 780         if (retval != ERROR_OK)
 781                 return retval;
 782         *physical = ret;
 783         return ERROR_OK;
 784 }
 785
 786 static int arm926ejs_mmu(struct target *target, int *enabled)
 787 {
 788         struct arm926ejs_common *arm926ejs = target_to_arm926(target);
 789
 790         if (target->state != TARGET_HALTED)
 791         {
 792                 LOG_ERROR("Target not halted");
 793                 return ERROR_TARGET_INVALID;
 794         }
 795         *enabled = arm926ejs->armv4_5_mmu.mmu_enabled;
 796         return ERROR_OK;
 797 }
 798
 799 static const struct command_registration arm926ejs_exec_command_handlers[] = {
 800         {
 801                 .name = "cache_info",
 802                 .handler = arm926ejs_handle_cache_info_command,
 803                 .mode = COMMAND_EXEC,
 804                 .help = "display information about target caches",
 805
 806         },
 807         COMMAND_REGISTRATION_DONE
 808 };
 809 const struct command_registration arm926ejs_command_handlers[] = {
 810         {
 811                 .chain = arm9tdmi_command_handlers,
 812         },
 813         {
 814                 .name = "arm926ejs",
 815                 .mode = COMMAND_ANY,
 816                 .help = "arm926ejs command group",
 817                 .chain = arm926ejs_exec_command_handlers,
 818         },
 819         COMMAND_REGISTRATION_DONE
 820 };
 821
 822 /** Holds methods for ARM926 targets. */
 823 struct target_type arm926ejs_target =
 824 {
 825         .name = "arm926ejs",
 826
 827         .poll = arm7_9_poll,
 828         .arch_state = arm926ejs_arch_state,
 829
 830         .target_request_data = arm7_9_target_request_data,
 831
 832         .halt = arm7_9_halt,
 833         .resume = arm7_9_resume,
 834         .step = arm7_9_step,
 835
 836         .assert_reset = arm7_9_assert_reset,
 837         .deassert_reset = arm7_9_deassert_reset,
 838         .soft_reset_halt = arm926ejs_soft_reset_halt,
 839
 840         .get_gdb_reg_list = arm_get_gdb_reg_list,
 841
 842         .read_memory = arm7_9_read_memory,
 843         .write_memory = arm926ejs_write_memory,
 844         .bulk_write_memory = arm7_9_bulk_write_memory,
 845
 846         .checksum_memory = arm_checksum_memory,
 847         .blank_check_memory = arm_blank_check_memory,
 848
 849         .run_algorithm = armv4_5_run_algorithm,
 850
 851         .add_breakpoint = arm7_9_add_breakpoint,
 852         .remove_breakpoint = arm7_9_remove_breakpoint,
 853         .add_watchpoint = arm7_9_add_watchpoint,
 854         .remove_watchpoint = arm7_9_remove_watchpoint,
 855
 856         .commands = arm926ejs_command_handlers,
 857         .target_create = arm926ejs_target_create,
 858         .init_target = arm9tdmi_init_target,
 859         .examine = arm7_9_examine,
 860         .check_reset = arm7_9_check_reset,
 861         .virt2phys = arm926ejs_virt2phys,
 862         .mmu = arm926ejs_mmu,
 863
 864         .read_phys_memory = arm926ejs_read_phys_memory,
 865         .write_phys_memory = arm926ejs_write_phys_memory,
 866 };