src/target/arm720t.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 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 "arm720t.h"
  28 #include "time_support.h"
  29 #include "target_type.h"
  30 #include "register.h"
  31
  32
  33 /*
  34  * ARM720 is an ARM7TDMI-S with MMU and ETM7.  For information, see
  35  * ARM DDI 0229C especially Chapter 9 about debug support.
  36  */
  37
  38 #if 0
  39 #define _DEBUG_INSTRUCTION_EXECUTION_
  40 #endif
  41
  42 static int arm720t_scan_cp15(struct target *target,
  43                 uint32_t out, uint32_t *in, int instruction, int clock)
  44 {
  45         int retval;
  46         struct arm720t_common *arm720t = target_to_arm720(target);
  47         struct arm_jtag *jtag_info;
  48         struct scan_field fields[2];
  49         uint8_t out_buf[4];
  50         uint8_t instruction_buf = instruction;
  51
  52         jtag_info = &arm720t->arm7_9_common.jtag_info;
  53
  54         buf_set_u32(out_buf, 0, 32, flip_u32(out, 32));
  55
  56         jtag_set_end_state(TAP_DRPAUSE);
  57         if ((retval = arm_jtag_scann(jtag_info, 0xf)) != ERROR_OK)
  58         {
  59                 return retval;
  60         }
  61         if ((retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL)) != ERROR_OK)
  62         {
  63                 return retval;
  64         }
  65
  66         fields[0].tap = jtag_info->tap;
  67         fields[0].num_bits = 1;
  68         fields[0].out_value = &instruction_buf;
  69         fields[0].in_value = NULL;
  70
  71         fields[1].tap = jtag_info->tap;
  72         fields[1].num_bits = 32;
  73         fields[1].out_value = out_buf;
  74         fields[1].in_value = NULL;
  75
  76         if (in)
  77         {
  78                 fields[1].in_value = (uint8_t *)in;
  79                 jtag_add_dr_scan(2, fields, jtag_get_end_state());
  80                 jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
  81         } else
  82         {
  83                 jtag_add_dr_scan(2, fields, jtag_get_end_state());
  84         }
  85
  86         if (clock)
  87                 jtag_add_runtest(0, jtag_get_end_state());
  88
  89 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
  90         if ((retval = jtag_execute_queue()) != ERROR_OK)
  91         {
  92                 return retval;
  93         }
  94
  95         if (in)
  96                 LOG_DEBUG("out: %8.8x, in: %8.8x, instruction: %i, clock: %i", out, *in, instruction, clock);
  97         else
  98                 LOG_DEBUG("out: %8.8x, instruction: %i, clock: %i", out, instruction, clock);
  99 #else
 100                 LOG_DEBUG("out: %8.8" PRIx32 ", instruction: %i, clock: %i", out, instruction, clock);
 101 #endif
 102
 103         return ERROR_OK;
 104 }
 105
 106 static int arm720t_read_cp15(struct target *target, uint32_t opcode, uint32_t *value)
 107 {
 108         /* fetch CP15 opcode */
 109         arm720t_scan_cp15(target, opcode, NULL, 1, 1);
 110         /* "DECODE" stage */
 111         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 112         /* "EXECUTE" stage (1) */
 113         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 0);
 114         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 115         /* "EXECUTE" stage (2) */
 116         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 117         /* "EXECUTE" stage (3), CDATA is read */
 118         arm720t_scan_cp15(target, ARMV4_5_NOP, value, 1, 1);
 119
 120         return ERROR_OK;
 121 }
 122
 123 static int arm720t_write_cp15(struct target *target, uint32_t opcode, uint32_t value)
 124 {
 125         /* fetch CP15 opcode */
 126         arm720t_scan_cp15(target, opcode, NULL, 1, 1);
 127         /* "DECODE" stage */
 128         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 129         /* "EXECUTE" stage (1) */
 130         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 0);
 131         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 132         /* "EXECUTE" stage (2) */
 133         arm720t_scan_cp15(target, value, NULL, 0, 1);
 134         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 135
 136         return ERROR_OK;
 137 }
 138
 139 static uint32_t arm720t_get_ttb(struct target *target)
 140 {
 141         uint32_t ttb = 0x0;
 142
 143         arm720t_read_cp15(target, 0xee120f10, &ttb);
 144         jtag_execute_queue();
 145
 146         ttb &= 0xffffc000;
 147
 148         return ttb;
 149 }
 150
 151 static void arm720t_disable_mmu_caches(struct target *target,
 152                 int mmu, int d_u_cache, int i_cache)
 153 {
 154         uint32_t cp15_control;
 155
 156         /* read cp15 control register */
 157         arm720t_read_cp15(target, 0xee110f10, &cp15_control);
 158         jtag_execute_queue();
 159
 160         if (mmu)
 161                 cp15_control &= ~0x1U;
 162
 163         if (d_u_cache || i_cache)
 164                 cp15_control &= ~0x4U;
 165
 166         arm720t_write_cp15(target, 0xee010f10, cp15_control);
 167 }
 168
 169 static void arm720t_enable_mmu_caches(struct target *target,
 170                 int mmu, int d_u_cache, int i_cache)
 171 {
 172         uint32_t cp15_control;
 173
 174         /* read cp15 control register */
 175         arm720t_read_cp15(target, 0xee110f10, &cp15_control);
 176         jtag_execute_queue();
 177
 178         if (mmu)
 179                 cp15_control |= 0x1U;
 180
 181         if (d_u_cache || i_cache)
 182                 cp15_control |= 0x4U;
 183
 184         arm720t_write_cp15(target, 0xee010f10, cp15_control);
 185 }
 186
 187 static void arm720t_post_debug_entry(struct target *target)
 188 {
 189         struct arm720t_common *arm720t = target_to_arm720(target);
 190
 191         /* examine cp15 control reg */
 192         arm720t_read_cp15(target, 0xee110f10, &arm720t->cp15_control_reg);
 193         jtag_execute_queue();
 194         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm720t->cp15_control_reg);
 195
 196         arm720t->armv4_5_mmu.mmu_enabled = (arm720t->cp15_control_reg & 0x1U) ? 1 : 0;
 197         arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm720t->cp15_control_reg & 0x4U) ? 1 : 0;
 198         arm720t->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 199
 200         /* save i/d fault status and address register */
 201         arm720t_read_cp15(target, 0xee150f10, &arm720t->fsr_reg);
 202         arm720t_read_cp15(target, 0xee160f10, &arm720t->far_reg);
 203         jtag_execute_queue();
 204 }
 205
 206 static void arm720t_pre_restore_context(struct target *target)
 207 {
 208         struct arm720t_common *arm720t = target_to_arm720(target);
 209
 210         /* restore i/d fault status and address register */
 211         arm720t_write_cp15(target, 0xee050f10, arm720t->fsr_reg);
 212         arm720t_write_cp15(target, 0xee060f10, arm720t->far_reg);
 213 }
 214
 215 static int arm720t_verify_pointer(struct command_context *cmd_ctx,
 216                 struct arm720t_common *arm720t)
 217 {
 218         if (arm720t->common_magic != ARM720T_COMMON_MAGIC) {
 219                 command_print(cmd_ctx, "target is not an ARM720");
 220                 return ERROR_TARGET_INVALID;
 221         }
 222         return ERROR_OK;
 223 }
 224
 225 static int arm720t_arch_state(struct target *target)
 226 {
 227         struct arm720t_common *arm720t = target_to_arm720(target);
 228         struct armv4_5_common_s *armv4_5;
 229
 230         static const char *state[] =
 231         {
 232                 "disabled", "enabled"
 233         };
 234
 235         armv4_5 = &arm720t->arm7_9_common.armv4_5_common;
 236
 237         LOG_USER("target halted in %s state due to %s, current mode: %s\n"
 238                         "cpsr: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "\n"
 239                         "MMU: %s, Cache: %s",
 240                          armv4_5_state_strings[armv4_5->core_state],
 241                          Jim_Nvp_value2name_simple(nvp_target_debug_reason, target->debug_reason)->name ,
 242                          arm_mode_name(armv4_5->core_mode),
 243                          buf_get_u32(armv4_5->cpsr->value, 0, 32),
 244                          buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 245                          state[arm720t->armv4_5_mmu.mmu_enabled],
 246                          state[arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled]);
 247
 248         return ERROR_OK;
 249 }
 250
 251 static int arm720_mmu(struct target *target, int *enabled)
 252 {
 253         if (target->state != TARGET_HALTED) {
 254                 LOG_ERROR("%s: target not halted", __func__);
 255                 return ERROR_TARGET_INVALID;
 256         }
 257
 258         *enabled = target_to_arm720(target)->armv4_5_mmu.mmu_enabled;
 259         return ERROR_OK;
 260 }
 261
 262 static int arm720_virt2phys(struct target *target,
 263                 uint32_t virt, uint32_t *phys)
 264 {
 265         /** @todo Implement this!  */
 266         LOG_ERROR("%s: not implemented", __func__);
 267         return ERROR_FAIL;
 268 }
 269
 270 static int arm720t_read_memory(struct target *target,
 271                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 272 {
 273         int retval;
 274         struct arm720t_common *arm720t = target_to_arm720(target);
 275
 276         /* disable cache, but leave MMU enabled */
 277         if (arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 278                 arm720t_disable_mmu_caches(target, 0, 1, 0);
 279
 280         retval = arm7_9_read_memory(target, address, size, count, buffer);
 281
 282         if (arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 283                 arm720t_enable_mmu_caches(target, 0, 1, 0);
 284
 285         return retval;
 286 }
 287
 288 static int arm720t_read_phys_memory(struct target *target,
 289                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 290 {
 291         struct arm720t_common *arm720t = target_to_arm720(target);
 292
 293         return armv4_5_mmu_read_physical(target, &arm720t->armv4_5_mmu, address, size, count, buffer);
 294 }
 295
 296 static int arm720t_write_phys_memory(struct target *target,
 297                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 298 {
 299         struct arm720t_common *arm720t = target_to_arm720(target);
 300
 301         return armv4_5_mmu_write_physical(target, &arm720t->armv4_5_mmu, address, size, count, buffer);
 302 }
 303
 304 static int arm720t_soft_reset_halt(struct target *target)
 305 {
 306         int retval = ERROR_OK;
 307         struct arm720t_common *arm720t = target_to_arm720(target);
 308         struct reg *dbg_stat = &arm720t->arm7_9_common
 309                         .eice_cache->reg_list[EICE_DBG_STAT];
 310         struct armv4_5_common_s *armv4_5 = &arm720t->arm7_9_common
 311                         .armv4_5_common;
 312
 313         if ((retval = target_halt(target)) != ERROR_OK)
 314         {
 315                 return retval;
 316         }
 317
 318         long long then = timeval_ms();
 319         int timeout;
 320         while (!(timeout = ((timeval_ms()-then) > 1000)))
 321         {
 322                 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 323                 {
 324                         embeddedice_read_reg(dbg_stat);
 325                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 326                         {
 327                                 return retval;
 328                         }
 329                 } else
 330                 {
 331                         break;
 332                 }
 333                 if (debug_level >= 3)
 334                 {
 335                         alive_sleep(100);
 336                 } else
 337                 {
 338                         keep_alive();
 339                 }
 340         }
 341         if (timeout)
 342         {
 343                 LOG_ERROR("Failed to halt CPU after 1 sec");
 344                 return ERROR_TARGET_TIMEOUT;
 345         }
 346
 347         target->state = TARGET_HALTED;
 348
 349         /* SVC, ARM state, IRQ and FIQ disabled */
 350         buf_set_u32(armv4_5->cpsr->value, 0, 8, 0xd3);
 351         armv4_5->cpsr->dirty = 1;
 352         armv4_5->cpsr->valid = 1;
 353
 354         /* start fetching from 0x0 */
 355         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, 0x0);
 356         armv4_5->core_cache->reg_list[15].dirty = 1;
 357         armv4_5->core_cache->reg_list[15].valid = 1;
 358
 359         armv4_5->core_mode = ARMV4_5_MODE_SVC;
 360         armv4_5->core_state = ARMV4_5_STATE_ARM;
 361
 362         arm720t_disable_mmu_caches(target, 1, 1, 1);
 363         arm720t->armv4_5_mmu.mmu_enabled = 0;
 364         arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
 365         arm720t->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 366
 367         if ((retval = target_call_event_callbacks(target, TARGET_EVENT_HALTED)) != ERROR_OK)
 368         {
 369                 return retval;
 370         }
 371
 372         return ERROR_OK;
 373 }
 374
 375 static int arm720t_init_target(struct command_context *cmd_ctx, struct target *target)
 376 {
 377         return arm7tdmi_init_target(cmd_ctx, target);
 378 }
 379
 380 static int arm720t_init_arch_info(struct target *target,
 381                 struct arm720t_common *arm720t, struct jtag_tap *tap)
 382 {
 383         struct arm7_9_common *arm7_9 = &arm720t->arm7_9_common;
 384
 385         arm7tdmi_init_arch_info(target, arm7_9, tap);
 386
 387         arm720t->common_magic = ARM720T_COMMON_MAGIC;
 388
 389         arm7_9->post_debug_entry = arm720t_post_debug_entry;
 390         arm7_9->pre_restore_context = arm720t_pre_restore_context;
 391
 392         arm720t->armv4_5_mmu.armv4_5_cache.ctype = -1;
 393         arm720t->armv4_5_mmu.get_ttb = arm720t_get_ttb;
 394         arm720t->armv4_5_mmu.read_memory = arm7_9_read_memory;
 395         arm720t->armv4_5_mmu.write_memory = arm7_9_write_memory;
 396         arm720t->armv4_5_mmu.disable_mmu_caches = arm720t_disable_mmu_caches;
 397         arm720t->armv4_5_mmu.enable_mmu_caches = arm720t_enable_mmu_caches;
 398         arm720t->armv4_5_mmu.has_tiny_pages = 0;
 399         arm720t->armv4_5_mmu.mmu_enabled = 0;
 400
 401         return ERROR_OK;
 402 }
 403
 404 static int arm720t_target_create(struct target *target, Jim_Interp *interp)
 405 {
 406         struct arm720t_common *arm720t = calloc(1, sizeof(*arm720t));
 407
 408         arm720t->arm7_9_common.armv4_5_common.is_armv4 = true;
 409         return arm720t_init_arch_info(target, arm720t, target->tap);
 410 }
 411
 412 COMMAND_HANDLER(arm720t_handle_cp15_command)
 413 {
 414         int retval;
 415         struct target *target = get_current_target(CMD_CTX);
 416         struct arm720t_common *arm720t = target_to_arm720(target);
 417         struct arm_jtag *jtag_info;
 418
 419         retval = arm720t_verify_pointer(CMD_CTX, arm720t);
 420         if (retval != ERROR_OK)
 421                 return retval;
 422
 423         jtag_info = &arm720t->arm7_9_common.jtag_info;
 424
 425         if (target->state != TARGET_HALTED)
 426         {
 427                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
 428                 return ERROR_OK;
 429         }
 430
 431         /* one or more argument, access a single register (write if second argument is given */
 432         if (CMD_ARGC >= 1)
 433         {
 434                 uint32_t opcode;
 435                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], opcode);
 436
 437                 if (CMD_ARGC == 1)
 438                 {
 439                         uint32_t value;
 440                         if ((retval = arm720t_read_cp15(target, opcode, &value)) != ERROR_OK)
 441                         {
 442                                 command_print(CMD_CTX, "couldn't access cp15 with opcode 0x%8.8" PRIx32 "", opcode);
 443                                 return ERROR_OK;
 444                         }
 445
 446                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 447                         {
 448                                 return retval;
 449                         }
 450
 451                         command_print(CMD_CTX, "0x%8.8" PRIx32 ": 0x%8.8" PRIx32 "", opcode, value);
 452                 }
 453                 else if (CMD_ARGC == 2)
 454                 {
 455                         uint32_t value;
 456                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
 457
 458                         if ((retval = arm720t_write_cp15(target, opcode, value)) != ERROR_OK)
 459                         {
 460                                 command_print(CMD_CTX, "couldn't access cp15 with opcode 0x%8.8" PRIx32 "", opcode);
 461                                 return ERROR_OK;
 462                         }
 463                         command_print(CMD_CTX, "0x%8.8" PRIx32 ": 0x%8.8" PRIx32 "", opcode, value);
 464                 }
 465         }
 466
 467         return ERROR_OK;
 468 }
 469
 470 static int arm720t_mrc(struct target *target, int cpnum, uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
 471 {
 472         if (cpnum!=15)
 473         {
 474                 LOG_ERROR("Only cp15 is supported");
 475                 return ERROR_FAIL;
 476         }
 477
 478         return arm720t_read_cp15(target, mrc_opcode(cpnum, op1, op2, CRn, CRm), value);
 479
 480 }
 481
 482 static int arm720t_mcr(struct target *target, int cpnum, uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
 483 {
 484         if (cpnum!=15)
 485         {
 486                 LOG_ERROR("Only cp15 is supported");
 487                 return ERROR_FAIL;
 488         }
 489
 490         return arm720t_write_cp15(target, mrc_opcode(cpnum, op1, op2, CRn, CRm), value);
 491 }
 492
 493 static int arm720t_register_commands(struct command_context *cmd_ctx)
 494 {
 495         int retval;
 496         struct command *arm720t_cmd;
 497
 498
 499         retval = arm7_9_register_commands(cmd_ctx);
 500
 501         arm720t_cmd = register_command(cmd_ctx, NULL, "arm720t",
 502                         NULL, COMMAND_ANY,
 503                         "arm720t specific commands");
 504
 505         register_command(cmd_ctx, arm720t_cmd, "cp15",
 506                         arm720t_handle_cp15_command, COMMAND_EXEC,
 507                         "display/modify cp15 register <opcode> [value]");
 508
 509         return ERROR_OK;
 510 }
 511
 512 /** Holds methods for ARM720 targets. */
 513 struct target_type arm720t_target =
 514 {
 515         .name = "arm720t",
 516
 517         .poll = arm7_9_poll,
 518         .arch_state = arm720t_arch_state,
 519
 520         .halt = arm7_9_halt,
 521         .resume = arm7_9_resume,
 522         .step = arm7_9_step,
 523
 524         .assert_reset = arm7_9_assert_reset,
 525         .deassert_reset = arm7_9_deassert_reset,
 526         .soft_reset_halt = arm720t_soft_reset_halt,
 527
 528         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
 529
 530         .read_memory = arm720t_read_memory,
 531         .write_memory = arm7_9_write_memory,
 532         .read_phys_memory = arm720t_read_phys_memory,
 533         .write_phys_memory = arm720t_write_phys_memory,
 534         .mmu = arm720_mmu,
 535         .virt2phys = arm720_virt2phys,
 536
 537         .bulk_write_memory = arm7_9_bulk_write_memory,
 538
 539         .checksum_memory = arm_checksum_memory,
 540         .blank_check_memory = arm_blank_check_memory,
 541
 542         .run_algorithm = armv4_5_run_algorithm,
 543
 544         .add_breakpoint = arm7_9_add_breakpoint,
 545         .remove_breakpoint = arm7_9_remove_breakpoint,
 546         .add_watchpoint = arm7_9_add_watchpoint,
 547         .remove_watchpoint = arm7_9_remove_watchpoint,
 548
 549         .register_commands = arm720t_register_commands,
 550         .target_create = arm720t_target_create,
 551         .init_target = arm720t_init_target,
 552         .examine = arm7_9_examine,
 553         .mrc = arm720t_mrc,
 554         .mcr = arm720t_mcr,
 555 };