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 <helper/time_support.h>
  29 #include "target_type.h"
  30 #include "register.h"
  31 #include "arm_opcodes.h"
  32
  33
  34 /*
  35  * ARM720 is an ARM7TDMI-S with MMU and ETM7.  For information, see
  36  * ARM DDI 0229C especially Chapter 9 about debug support.
  37  */
  38
  39 #if 0
  40 #define _DEBUG_INSTRUCTION_EXECUTION_
  41 #endif
  42
  43 static int arm720t_scan_cp15(struct target *target,
  44                 uint32_t out, uint32_t *in, int instruction, int clock)
  45 {
  46         int retval;
  47         struct arm720t_common *arm720t = target_to_arm720(target);
  48         struct arm_jtag *jtag_info;
  49         struct scan_field fields[2];
  50         uint8_t out_buf[4];
  51         uint8_t instruction_buf = instruction;
  52
  53         jtag_info = &arm720t->arm7_9_common.jtag_info;
  54
  55         buf_set_u32(out_buf, 0, 32, flip_u32(out, 32));
  56
  57         if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_DRPAUSE)) != ERROR_OK)
  58         {
  59                 return retval;
  60         }
  61         if ((retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE)) != ERROR_OK)
  62         {
  63                 return retval;
  64         }
  65
  66         fields[0].num_bits = 1;
  67         fields[0].out_value = &instruction_buf;
  68         fields[0].in_value = NULL;
  69
  70         fields[1].num_bits = 32;
  71         fields[1].out_value = out_buf;
  72         fields[1].in_value = NULL;
  73
  74         if (in)
  75         {
  76                 fields[1].in_value = (uint8_t *)in;
  77                 jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
  78                 jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
  79         } else
  80         {
  81                 jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
  82         }
  83
  84         if (clock)
  85                 jtag_add_runtest(0, TAP_DRPAUSE);
  86
  87 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
  88         if ((retval = jtag_execute_queue()) != ERROR_OK)
  89         {
  90                 return retval;
  91         }
  92
  93         if (in)
  94                 LOG_DEBUG("out: %8.8x, in: %8.8x, instruction: %i, clock: %i", out, *in, instruction, clock);
  95         else
  96                 LOG_DEBUG("out: %8.8x, instruction: %i, clock: %i", out, instruction, clock);
  97 #else
  98                 LOG_DEBUG("out: %8.8" PRIx32 ", instruction: %i, clock: %i", out, instruction, clock);
  99 #endif
 100
 101         return ERROR_OK;
 102 }
 103
 104 static int arm720t_read_cp15(struct target *target, uint32_t opcode, uint32_t *value)
 105 {
 106         /* fetch CP15 opcode */
 107         arm720t_scan_cp15(target, opcode, NULL, 1, 1);
 108         /* "DECODE" stage */
 109         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 110         /* "EXECUTE" stage (1) */
 111         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 0);
 112         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 113         /* "EXECUTE" stage (2) */
 114         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 115         /* "EXECUTE" stage (3), CDATA is read */
 116         arm720t_scan_cp15(target, ARMV4_5_NOP, value, 1, 1);
 117
 118         return ERROR_OK;
 119 }
 120
 121 static int arm720t_write_cp15(struct target *target, uint32_t opcode, uint32_t value)
 122 {
 123         /* fetch CP15 opcode */
 124         arm720t_scan_cp15(target, opcode, NULL, 1, 1);
 125         /* "DECODE" stage */
 126         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 127         /* "EXECUTE" stage (1) */
 128         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 0);
 129         arm720t_scan_cp15(target, 0x0, NULL, 0, 1);
 130         /* "EXECUTE" stage (2) */
 131         arm720t_scan_cp15(target, value, NULL, 0, 1);
 132         arm720t_scan_cp15(target, ARMV4_5_NOP, NULL, 1, 1);
 133
 134         return ERROR_OK;
 135 }
 136
 137 static uint32_t arm720t_get_ttb(struct target *target)
 138 {
 139         uint32_t ttb = 0x0;
 140
 141         arm720t_read_cp15(target, 0xee120f10, &ttb);
 142         jtag_execute_queue();
 143
 144         ttb &= 0xffffc000;
 145
 146         return ttb;
 147 }
 148
 149 static void arm720t_disable_mmu_caches(struct target *target,
 150                 int mmu, int d_u_cache, int i_cache)
 151 {
 152         uint32_t cp15_control;
 153
 154         /* read cp15 control register */
 155         arm720t_read_cp15(target, 0xee110f10, &cp15_control);
 156         jtag_execute_queue();
 157
 158         if (mmu)
 159                 cp15_control &= ~0x1U;
 160
 161         if (d_u_cache || i_cache)
 162                 cp15_control &= ~0x4U;
 163
 164         arm720t_write_cp15(target, 0xee010f10, cp15_control);
 165 }
 166
 167 static void arm720t_enable_mmu_caches(struct target *target,
 168                 int mmu, int d_u_cache, int i_cache)
 169 {
 170         uint32_t cp15_control;
 171
 172         /* read cp15 control register */
 173         arm720t_read_cp15(target, 0xee110f10, &cp15_control);
 174         jtag_execute_queue();
 175
 176         if (mmu)
 177                 cp15_control |= 0x1U;
 178
 179         if (d_u_cache || i_cache)
 180                 cp15_control |= 0x4U;
 181
 182         arm720t_write_cp15(target, 0xee010f10, cp15_control);
 183 }
 184
 185 static void arm720t_post_debug_entry(struct target *target)
 186 {
 187         struct arm720t_common *arm720t = target_to_arm720(target);
 188
 189         /* examine cp15 control reg */
 190         arm720t_read_cp15(target, 0xee110f10, &arm720t->cp15_control_reg);
 191         jtag_execute_queue();
 192         LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm720t->cp15_control_reg);
 193
 194         arm720t->armv4_5_mmu.mmu_enabled = (arm720t->cp15_control_reg & 0x1U) ? 1 : 0;
 195         arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm720t->cp15_control_reg & 0x4U) ? 1 : 0;
 196         arm720t->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 197
 198         /* save i/d fault status and address register */
 199         arm720t_read_cp15(target, 0xee150f10, &arm720t->fsr_reg);
 200         arm720t_read_cp15(target, 0xee160f10, &arm720t->far_reg);
 201         jtag_execute_queue();
 202 }
 203
 204 static void arm720t_pre_restore_context(struct target *target)
 205 {
 206         struct arm720t_common *arm720t = target_to_arm720(target);
 207
 208         /* restore i/d fault status and address register */
 209         arm720t_write_cp15(target, 0xee050f10, arm720t->fsr_reg);
 210         arm720t_write_cp15(target, 0xee060f10, arm720t->far_reg);
 211 }
 212
 213 static int arm720t_verify_pointer(struct command_context *cmd_ctx,
 214                 struct arm720t_common *arm720t)
 215 {
 216         if (arm720t->common_magic != ARM720T_COMMON_MAGIC) {
 217                 command_print(cmd_ctx, "target is not an ARM720");
 218                 return ERROR_TARGET_INVALID;
 219         }
 220         return ERROR_OK;
 221 }
 222
 223 static int arm720t_arch_state(struct target *target)
 224 {
 225         struct arm720t_common *arm720t = target_to_arm720(target);
 226         struct arm *armv4_5;
 227
 228         static const char *state[] =
 229         {
 230                 "disabled", "enabled"
 231         };
 232
 233         armv4_5 = &arm720t->arm7_9_common.armv4_5_common;
 234
 235         arm_arch_state(target);
 236         LOG_USER("MMU: %s, Cache: %s",
 237                          state[arm720t->armv4_5_mmu.mmu_enabled],
 238                          state[arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled]);
 239
 240         return ERROR_OK;
 241 }
 242
 243 static int arm720_mmu(struct target *target, int *enabled)
 244 {
 245         if (target->state != TARGET_HALTED) {
 246                 LOG_ERROR("%s: target not halted", __func__);
 247                 return ERROR_TARGET_INVALID;
 248         }
 249
 250         *enabled = target_to_arm720(target)->armv4_5_mmu.mmu_enabled;
 251         return ERROR_OK;
 252 }
 253
 254 static int arm720_virt2phys(struct target *target,
 255                 uint32_t virtual, uint32_t *physical)
 256 {
 257         int type;
 258         uint32_t cb;
 259         int domain;
 260         uint32_t ap;
 261         struct arm720t_common *arm720t = target_to_arm720(target);
 262
 263         uint32_t ret = armv4_5_mmu_translate_va(target, &arm720t->armv4_5_mmu, virtual, &type, &cb, &domain, &ap);
 264         if (type == -1)
 265         {
 266                 return ret;
 267         }
 268         *physical = ret;
 269         return ERROR_OK;
 270 }
 271
 272 static int arm720t_read_memory(struct target *target,
 273                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 274 {
 275         int retval;
 276         struct arm720t_common *arm720t = target_to_arm720(target);
 277
 278         /* disable cache, but leave MMU enabled */
 279         if (arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 280                 arm720t_disable_mmu_caches(target, 0, 1, 0);
 281
 282         retval = arm7_9_read_memory(target, address, size, count, buffer);
 283
 284         if (arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
 285                 arm720t_enable_mmu_caches(target, 0, 1, 0);
 286
 287         return retval;
 288 }
 289
 290 static int arm720t_read_phys_memory(struct target *target,
 291                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 292 {
 293         struct arm720t_common *arm720t = target_to_arm720(target);
 294
 295         return armv4_5_mmu_read_physical(target, &arm720t->armv4_5_mmu, address, size, count, buffer);
 296 }
 297
 298 static int arm720t_write_phys_memory(struct target *target,
 299                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 300 {
 301         struct arm720t_common *arm720t = target_to_arm720(target);
 302
 303         return armv4_5_mmu_write_physical(target, &arm720t->armv4_5_mmu, address, size, count, buffer);
 304 }
 305
 306 static int arm720t_soft_reset_halt(struct target *target)
 307 {
 308         int retval = ERROR_OK;
 309         struct arm720t_common *arm720t = target_to_arm720(target);
 310         struct reg *dbg_stat = &arm720t->arm7_9_common
 311                         .eice_cache->reg_list[EICE_DBG_STAT];
 312         struct arm *armv4_5 = &arm720t->arm7_9_common
 313                         .armv4_5_common;
 314
 315         if ((retval = target_halt(target)) != ERROR_OK)
 316         {
 317                 return retval;
 318         }
 319
 320         long long then = timeval_ms();
 321         int timeout;
 322         while (!(timeout = ((timeval_ms()-then) > 1000)))
 323         {
 324                 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 325                 {
 326                         embeddedice_read_reg(dbg_stat);
 327                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 328                         {
 329                                 return retval;
 330                         }
 331                 } else
 332                 {
 333                         break;
 334                 }
 335                 if (debug_level >= 3)
 336                 {
 337                         alive_sleep(100);
 338                 } else
 339                 {
 340                         keep_alive();
 341                 }
 342         }
 343         if (timeout)
 344         {
 345                 LOG_ERROR("Failed to halt CPU after 1 sec");
 346                 return ERROR_TARGET_TIMEOUT;
 347         }
 348
 349         target->state = TARGET_HALTED;
 350
 351         /* SVC, ARM state, IRQ and FIQ disabled */
 352         uint32_t cpsr;
 353
 354         cpsr = buf_get_u32(armv4_5->cpsr->value, 0, 32);
 355         cpsr &= ~0xff;
 356         cpsr |= 0xd3;
 357         arm_set_cpsr(armv4_5, cpsr);
 358         armv4_5->cpsr->dirty = 1;
 359
 360         /* start fetching from 0x0 */
 361         buf_set_u32(armv4_5->pc->value, 0, 32, 0x0);
 362         armv4_5->pc->dirty = 1;
 363         armv4_5->pc->valid = 1;
 364
 365         arm720t_disable_mmu_caches(target, 1, 1, 1);
 366         arm720t->armv4_5_mmu.mmu_enabled = 0;
 367         arm720t->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
 368         arm720t->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 369
 370         if ((retval = target_call_event_callbacks(target, TARGET_EVENT_HALTED)) != ERROR_OK)
 371         {
 372                 return retval;
 373         }
 374
 375         return ERROR_OK;
 376 }
 377
 378 static int arm720t_init_target(struct command_context *cmd_ctx, struct target *target)
 379 {
 380         return arm7tdmi_init_target(cmd_ctx, target);
 381 }
 382
 383 /* FIXME remove forward decls */
 384 static int arm720t_mrc(struct target *target, int cpnum,
 385                 uint32_t op1, uint32_t op2,
 386                 uint32_t CRn, uint32_t CRm,
 387                 uint32_t *value);
 388 static int arm720t_mcr(struct target *target, int cpnum,
 389                 uint32_t op1, uint32_t op2,
 390                 uint32_t CRn, uint32_t CRm,
 391                 uint32_t value);
 392
 393 static int arm720t_init_arch_info(struct target *target,
 394                 struct arm720t_common *arm720t, struct jtag_tap *tap)
 395 {
 396         struct arm7_9_common *arm7_9 = &arm720t->arm7_9_common;
 397
 398         arm7_9->armv4_5_common.mrc = arm720t_mrc;
 399         arm7_9->armv4_5_common.mcr = arm720t_mcr;
 400
 401         arm7tdmi_init_arch_info(target, arm7_9, tap);
 402
 403         arm720t->common_magic = ARM720T_COMMON_MAGIC;
 404
 405         arm7_9->post_debug_entry = arm720t_post_debug_entry;
 406         arm7_9->pre_restore_context = arm720t_pre_restore_context;
 407
 408         arm720t->armv4_5_mmu.armv4_5_cache.ctype = -1;
 409         arm720t->armv4_5_mmu.get_ttb = arm720t_get_ttb;
 410         arm720t->armv4_5_mmu.read_memory = arm7_9_read_memory;
 411         arm720t->armv4_5_mmu.write_memory = arm7_9_write_memory;
 412         arm720t->armv4_5_mmu.disable_mmu_caches = arm720t_disable_mmu_caches;
 413         arm720t->armv4_5_mmu.enable_mmu_caches = arm720t_enable_mmu_caches;
 414         arm720t->armv4_5_mmu.has_tiny_pages = 0;
 415         arm720t->armv4_5_mmu.mmu_enabled = 0;
 416
 417         return ERROR_OK;
 418 }
 419
 420 static int arm720t_target_create(struct target *target, Jim_Interp *interp)
 421 {
 422         struct arm720t_common *arm720t = calloc(1, sizeof(*arm720t));
 423
 424         arm720t->arm7_9_common.armv4_5_common.is_armv4 = true;
 425         return arm720t_init_arch_info(target, arm720t, target->tap);
 426 }
 427
 428 COMMAND_HANDLER(arm720t_handle_cp15_command)
 429 {
 430         int retval;
 431         struct target *target = get_current_target(CMD_CTX);
 432         struct arm720t_common *arm720t = target_to_arm720(target);
 433         struct arm_jtag *jtag_info;
 434
 435         retval = arm720t_verify_pointer(CMD_CTX, arm720t);
 436         if (retval != ERROR_OK)
 437                 return retval;
 438
 439         jtag_info = &arm720t->arm7_9_common.jtag_info;
 440
 441         if (target->state != TARGET_HALTED)
 442         {
 443                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
 444                 return ERROR_OK;
 445         }
 446
 447         /* one or more argument, access a single register (write if second argument is given */
 448         if (CMD_ARGC >= 1)
 449         {
 450                 uint32_t opcode;
 451                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], opcode);
 452
 453                 if (CMD_ARGC == 1)
 454                 {
 455                         uint32_t value;
 456                         if ((retval = arm720t_read_cp15(target, opcode, &value)) != ERROR_OK)
 457                         {
 458                                 command_print(CMD_CTX, "couldn't access cp15 with opcode 0x%8.8" PRIx32 "", opcode);
 459                                 return ERROR_OK;
 460                         }
 461
 462                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 463                         {
 464                                 return retval;
 465                         }
 466
 467                         command_print(CMD_CTX, "0x%8.8" PRIx32 ": 0x%8.8" PRIx32 "", opcode, value);
 468                 }
 469                 else if (CMD_ARGC == 2)
 470                 {
 471                         uint32_t value;
 472                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
 473
 474                         if ((retval = arm720t_write_cp15(target, opcode, value)) != ERROR_OK)
 475                         {
 476                                 command_print(CMD_CTX, "couldn't access cp15 with opcode 0x%8.8" PRIx32 "", opcode);
 477                                 return ERROR_OK;
 478                         }
 479                         command_print(CMD_CTX, "0x%8.8" PRIx32 ": 0x%8.8" PRIx32 "", opcode, value);
 480                 }
 481         }
 482
 483         return ERROR_OK;
 484 }
 485
 486 static int arm720t_mrc(struct target *target, int cpnum,
 487                 uint32_t op1, uint32_t op2,
 488                 uint32_t CRn, uint32_t CRm,
 489                 uint32_t *value)
 490 {
 491         if (cpnum!=15)
 492         {
 493                 LOG_ERROR("Only cp15 is supported");
 494                 return ERROR_FAIL;
 495         }
 496
 497         /* read "to" r0 */
 498         return arm720t_read_cp15(target,
 499                         ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2),
 500                         value);
 501
 502 }
 503
 504 static int arm720t_mcr(struct target *target, int cpnum,
 505                 uint32_t op1, uint32_t op2,
 506                 uint32_t CRn, uint32_t CRm,
 507                 uint32_t value)
 508 {
 509         if (cpnum!=15)
 510         {
 511                 LOG_ERROR("Only cp15 is supported");
 512                 return ERROR_FAIL;
 513         }
 514
 515         /* write "from" r0 */
 516         return arm720t_write_cp15(target,
 517                         ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2),
 518                         value);
 519 }
 520
 521 static const struct command_registration arm720t_exec_command_handlers[] = {
 522         {
 523                 .name = "cp15",
 524                 .handler = arm720t_handle_cp15_command,
 525                 .mode = COMMAND_EXEC,
 526                 /* prefer using less error-prone "arm mcr" or "arm mrc" */
 527                 .help = "display/modify cp15 register using ARM opcode"
 528                         " (DEPRECATED)",
 529                 .usage = "instruction [value]",
 530         },
 531         COMMAND_REGISTRATION_DONE
 532 };
 533
 534 static const struct command_registration arm720t_command_handlers[] = {
 535         {
 536                 .chain = arm7_9_command_handlers,
 537         },
 538         {
 539                 .name = "arm720t",
 540                 .mode = COMMAND_ANY,
 541                 .help = "arm720t command group",
 542                 .chain = arm720t_exec_command_handlers,
 543         },
 544         COMMAND_REGISTRATION_DONE
 545 };
 546
 547 /** Holds methods for ARM720 targets. */
 548 struct target_type arm720t_target =
 549 {
 550         .name = "arm720t",
 551
 552         .poll = arm7_9_poll,
 553         .arch_state = arm720t_arch_state,
 554
 555         .halt = arm7_9_halt,
 556         .resume = arm7_9_resume,
 557         .step = arm7_9_step,
 558
 559         .assert_reset = arm7_9_assert_reset,
 560         .deassert_reset = arm7_9_deassert_reset,
 561         .soft_reset_halt = arm720t_soft_reset_halt,
 562
 563         .get_gdb_reg_list = arm_get_gdb_reg_list,
 564
 565         .read_memory = arm720t_read_memory,
 566         .write_memory = arm7_9_write_memory,
 567         .read_phys_memory = arm720t_read_phys_memory,
 568         .write_phys_memory = arm720t_write_phys_memory,
 569         .mmu = arm720_mmu,
 570         .virt2phys = arm720_virt2phys,
 571
 572         .bulk_write_memory = arm7_9_bulk_write_memory,
 573
 574         .checksum_memory = arm_checksum_memory,
 575         .blank_check_memory = arm_blank_check_memory,
 576
 577         .run_algorithm = armv4_5_run_algorithm,
 578
 579         .add_breakpoint = arm7_9_add_breakpoint,
 580         .remove_breakpoint = arm7_9_remove_breakpoint,
 581         .add_watchpoint = arm7_9_add_watchpoint,
 582         .remove_watchpoint = arm7_9_remove_watchpoint,
 583
 584         .commands = arm720t_command_handlers,
 585         .target_create = arm720t_target_create,
 586         .init_target = arm720t_init_target,
 587         .examine = arm7_9_examine,
 588         .check_reset = arm7_9_check_reset,
 589 };