src/target/arm926ejs.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "arm926ejs.h"
  25 #include "jtag.h"
  26 #include "log.h"
  27
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #if 1
  32 #define _DEBUG_INSTRUCTION_EXECUTION_
  33 #endif
  34
  35 /* cli handling */
  36 int arm926ejs_register_commands(struct command_context_s *cmd_ctx);
  37
  38 int arm926ejs_handle_cp15_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  39 int arm926ejs_handle_cp15i_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  40 int arm926ejs_handle_virt2phys_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  41 int arm926ejs_handle_cache_info_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  42 int arm926ejs_handle_md_phys_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  43 int arm926ejs_handle_mw_phys_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  44
  45 int arm926ejs_handle_read_cache_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  46 int arm926ejs_handle_read_mmu_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  47
  48 /* forward declarations */
  49 int arm926ejs_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
  50 int arm926ejs_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  51 int arm926ejs_quit();
  52 int arm926ejs_arch_state(struct target_s *target, char *buf, int buf_size);
  53 int arm926ejs_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
  54 int arm926ejs_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
  55 int arm926ejs_soft_reset_halt(struct target_s *target);
  56
  57 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
  58
  59 target_type_t arm926ejs_target =
  60 {
  61         .name = "arm926ejs",
  62
  63         .poll = arm7_9_poll,
  64         .arch_state = arm926ejs_arch_state,
  65
  66         .halt = arm7_9_halt,
  67         .resume = arm7_9_resume,
  68         .step = arm7_9_step,
  69
  70         .assert_reset = arm7_9_assert_reset,
  71         .deassert_reset = arm7_9_deassert_reset,
  72         .soft_reset_halt = arm926ejs_soft_reset_halt,
  73         .prepare_reset_halt = arm7_9_prepare_reset_halt,
  74
  75         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  76
  77         .read_memory = arm7_9_read_memory,
  78         .write_memory = arm926ejs_write_memory,
  79         .bulk_write_memory = arm7_9_bulk_write_memory,
  80
  81         .run_algorithm = armv4_5_run_algorithm,
  82
  83         .add_breakpoint = arm7_9_add_breakpoint,
  84         .remove_breakpoint = arm7_9_remove_breakpoint,
  85         .add_watchpoint = arm7_9_add_watchpoint,
  86         .remove_watchpoint = arm7_9_remove_watchpoint,
  87
  88         .register_commands = arm926ejs_register_commands,
  89         .target_command = arm926ejs_target_command,
  90         .init_target = arm926ejs_init_target,
  91         .quit = arm926ejs_quit
  92 };
  93
  94 int arm926ejs_catch_broken_irscan(u8 *in_value, void *priv)
  95 {
  96         /* The ARM926EJ-S' instruction register is 4 bits wide */
  97         *in_value &= 0xf;
  98
  99         if ((*in_value == 0x0f) || (*in_value == 0x00))
 100         {
 101                 DEBUG("caught ARM926EJ-S invalid Capture-IR result after CP15 access");
 102                 return ERROR_OK;
 103         }
 104         else
 105         {
 106                 return ERROR_JTAG_QUEUE_FAILED;
 107         }
 108 }
 109
 110 int arm926ejs_read_cp15(target_t *target, u32 address, u32 *value)
 111 {
 112         armv4_5_common_t *armv4_5 = target->arch_info;
 113         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 114         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 115         scan_field_t fields[4];
 116         u8 address_buf[2];
 117         u8 nr_w_buf = 0;
 118         u8 access = 1;
 119         error_handler_t error_handler;
 120
 121         buf_set_u32(address_buf, 0, 14, address);
 122
 123         jtag_add_end_state(TAP_RTI);
 124         arm_jtag_scann(jtag_info, 0xf);
 125         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 126
 127         fields[0].device = jtag_info->chain_pos;
 128         fields[0].num_bits = 32;
 129         fields[0].out_value = NULL;
 130         fields[0].out_mask = NULL;
 131         fields[0].in_value = NULL;
 132         fields[0].in_check_value = NULL;
 133         fields[0].in_check_mask = NULL;
 134         fields[0].in_handler = NULL;
 135         fields[0].in_handler_priv = NULL;
 136
 137         fields[1].device = jtag_info->chain_pos;
 138         fields[1].num_bits = 1;
 139         fields[1].out_value = &access;
 140         fields[1].out_mask = NULL;
 141         fields[1].in_value = &access;
 142         fields[1].in_check_value = NULL;
 143         fields[1].in_check_mask = NULL;
 144         fields[1].in_handler = NULL;
 145         fields[1].in_handler_priv = NULL;
 146
 147         fields[2].device = jtag_info->chain_pos;
 148         fields[2].num_bits = 14;
 149         fields[2].out_value = address_buf;
 150         fields[2].out_mask = NULL;
 151         fields[2].in_value = NULL;
 152         fields[2].in_check_value = NULL;
 153         fields[2].in_check_mask = NULL;
 154         fields[2].in_handler = NULL;
 155         fields[2].in_handler_priv = NULL;
 156
 157         fields[3].device = jtag_info->chain_pos;
 158         fields[3].num_bits = 1;
 159         fields[3].out_value = &nr_w_buf;
 160         fields[3].out_mask = NULL;
 161         fields[3].in_value = NULL;
 162         fields[3].in_check_value = NULL;
 163         fields[3].in_check_mask = NULL;
 164         fields[3].in_handler = NULL;
 165         fields[3].in_handler_priv = NULL;
 166
 167         jtag_add_dr_scan(4, fields, -1, NULL);
 168
 169         fields[0].in_handler_priv = value;
 170         fields[0].in_handler = arm_jtag_buf_to_u32;
 171
 172         do
 173         {
 174                 /* rescan with NOP, to wait for the access to complete */
 175                 access = 0;
 176                 nr_w_buf = 0;
 177                 jtag_add_dr_scan(4, fields, -1, NULL);
 178                 jtag_execute_queue();
 179         } while (buf_get_u32(&access, 0, 1) != 1);
 180
 181 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 182         DEBUG("addr: 0x%x value: %8.8x", address, *value);
 183 #endif
 184
 185         error_handler.error_handler = arm926ejs_catch_broken_irscan;
 186         error_handler.error_handler_priv = NULL;
 187
 188         arm_jtag_set_instr(jtag_info, 0xc, &error_handler);
 189
 190         return ERROR_OK;
 191 }
 192
 193 int arm926ejs_write_cp15(target_t *target, u32 address, u32 value)
 194 {
 195         armv4_5_common_t *armv4_5 = target->arch_info;
 196         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 197         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 198         scan_field_t fields[4];
 199         u8 value_buf[4];
 200         u8 address_buf[2];
 201         u8 nr_w_buf = 1;
 202         u8 access = 1;
 203         error_handler_t error_handler;
 204
 205         buf_set_u32(address_buf, 0, 14, address);
 206         buf_set_u32(value_buf, 0, 32, value);
 207
 208         jtag_add_end_state(TAP_RTI);
 209         arm_jtag_scann(jtag_info, 0xf);
 210         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 211
 212         fields[0].device = jtag_info->chain_pos;
 213         fields[0].num_bits = 32;
 214         fields[0].out_value = value_buf;
 215         fields[0].out_mask = NULL;
 216         fields[0].in_value = NULL;
 217         fields[0].in_check_value = NULL;
 218         fields[0].in_check_mask = NULL;
 219         fields[0].in_handler = NULL;
 220         fields[0].in_handler_priv = NULL;
 221
 222         fields[1].device = jtag_info->chain_pos;
 223         fields[1].num_bits = 1;
 224         fields[1].out_value = &access;
 225         fields[1].out_mask = NULL;
 226         fields[1].in_value = &access;
 227         fields[1].in_check_value = NULL;
 228         fields[1].in_check_mask = NULL;
 229         fields[1].in_handler = NULL;
 230         fields[1].in_handler_priv = NULL;
 231
 232         fields[2].device = jtag_info->chain_pos;
 233         fields[2].num_bits = 14;
 234         fields[2].out_value = address_buf;
 235         fields[2].out_mask = NULL;
 236         fields[2].in_value = NULL;
 237         fields[2].in_check_value = NULL;
 238         fields[2].in_check_mask = NULL;
 239         fields[2].in_handler = NULL;
 240         fields[2].in_handler_priv = NULL;
 241
 242         fields[3].device = jtag_info->chain_pos;
 243         fields[3].num_bits = 1;
 244         fields[3].out_value = &nr_w_buf;
 245         fields[3].out_mask = NULL;
 246         fields[3].in_value = NULL;
 247         fields[3].in_check_value = NULL;
 248         fields[3].in_check_mask = NULL;
 249         fields[3].in_handler = NULL;
 250         fields[3].in_handler_priv = NULL;
 251
 252         jtag_add_dr_scan(4, fields, -1, NULL);
 253
 254         do
 255         {
 256                 /* rescan with NOP, to wait for the access to complete */
 257                 access = 0;
 258                 nr_w_buf = 0;
 259                 jtag_add_dr_scan(4, fields, -1, NULL);
 260                 jtag_execute_queue();
 261         } while (buf_get_u32(&access, 0, 1) != 1);
 262
 263 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 264         DEBUG("addr: 0x%x value: %8.8x", address, value);
 265 #endif
 266
 267         error_handler.error_handler = arm926ejs_catch_broken_irscan;
 268         error_handler.error_handler_priv = NULL;
 269
 270         arm_jtag_set_instr(jtag_info, 0xf, &error_handler);
 271
 272         return ERROR_OK;
 273 }
 274
 275 int arm926ejs_examine_debug_reason(target_t *target)
 276 {
 277         armv4_5_common_t *armv4_5 = target->arch_info;
 278         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 279         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 280         int debug_reason;
 281         int retval;
 282
 283         embeddedice_read_reg(dbg_stat);
 284         if ((retval = jtag_execute_queue()) != ERROR_OK)
 285                 return retval;
 286
 287         debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
 288
 289         switch (debug_reason)
 290         {
 291                 case 1:
 292                         DEBUG("breakpoint from EICE unit 0");
 293                         target->debug_reason = DBG_REASON_BREAKPOINT;
 294                         break;
 295                 case 2:
 296                         DEBUG("breakpoint from EICE unit 1");
 297                         target->debug_reason = DBG_REASON_BREAKPOINT;
 298                         break;
 299                 case 3:
 300                         DEBUG("soft breakpoint (BKPT instruction)");
 301                         target->debug_reason = DBG_REASON_BREAKPOINT;
 302                         break;
 303                 case 4:
 304                         DEBUG("vector catch breakpoint");
 305                         target->debug_reason = DBG_REASON_BREAKPOINT;
 306                         break;
 307                 case 5:
 308                         DEBUG("external breakpoint");
 309                         target->debug_reason = DBG_REASON_BREAKPOINT;
 310                         break;
 311                 case 6:
 312                         DEBUG("watchpoint from EICE unit 0");
 313                         target->debug_reason = DBG_REASON_WATCHPOINT;
 314                         break;
 315                 case 7:
 316                         DEBUG("watchpoint from EICE unit 1");
 317                         target->debug_reason = DBG_REASON_WATCHPOINT;
 318                         break;
 319                 case 8:
 320                         DEBUG("external watchpoint");
 321                         target->debug_reason = DBG_REASON_WATCHPOINT;
 322                         break;
 323                 case 9:
 324                         DEBUG("internal debug request");
 325                         target->debug_reason = DBG_REASON_DBGRQ;
 326                         break;
 327                 case 10:
 328                         DEBUG("external debug request");
 329                         target->debug_reason = DBG_REASON_DBGRQ;
 330                         break;
 331                 case 11:
 332                         ERROR("BUG: debug re-entry from system speed access shouldn't be handled here");
 333                         break;
 334                 default:
 335                         ERROR("BUG: unknown debug reason: 0x%x", debug_reason);
 336                         target->debug_reason = DBG_REASON_DBGRQ;
 337         }
 338
 339         return ERROR_OK;
 340 }
 341
 342 u32 arm926ejs_get_ttb(target_t *target)
 343 {
 344         int retval;
 345         u32 ttb = 0x0;
 346
 347         if ((retval = arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 2, 0), &ttb)) != ERROR_OK)
 348                 return retval;
 349
 350         return ttb;
 351 }
 352
 353 void arm926ejs_disable_mmu_caches(target_t *target, int mmu, int d_u_cache, int i_cache)
 354 {
 355         u32 cp15_control;
 356
 357         /* read cp15 control register */
 358         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 1, 0), &cp15_control);
 359         jtag_execute_queue();
 360
 361         if (mmu)
 362         {
 363                 /* invalidate TLB */
 364                 arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 8, 7), 0x0);
 365
 366                 cp15_control &= ~0x1U;
 367         }
 368
 369         if (d_u_cache)
 370         {
 371                 u32 debug_override;
 372                 /* read-modify-write CP15 debug override register
 373                  * to enable "test and clean all" */
 374                 arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 15, 0), &debug_override);
 375                 debug_override |= 0x80000;
 376                 arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 15, 0), debug_override);
 377
 378                 /* clean and invalidate DCache */
 379                 arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 7, 5), 0x0);
 380
 381                 /* write CP15 debug override register
 382                  * to disable "test and clean all" */
 383                 debug_override &= ~0x80000;
 384                 arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 15, 0), debug_override);
 385
 386                 cp15_control &= ~0x4U;
 387         }
 388
 389         if (i_cache)
 390         {
 391                 /* invalidate ICache */
 392                 arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 7, 5), 0x0);
 393
 394                 cp15_control &= ~0x1000U;
 395         }
 396
 397         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 1, 0), cp15_control);
 398 }
 399
 400 void arm926ejs_enable_mmu_caches(target_t *target, int mmu, int d_u_cache, int i_cache)
 401 {
 402         u32 cp15_control;
 403
 404         /* read cp15 control register */
 405         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 1, 0), &cp15_control);
 406         jtag_execute_queue();
 407
 408         if (mmu)
 409                 cp15_control |= 0x1U;
 410
 411         if (d_u_cache)
 412                 cp15_control |= 0x4U;
 413
 414         if (i_cache)
 415                 cp15_control |= 0x1000U;
 416
 417         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 1, 0), cp15_control);
 418 }
 419
 420 void arm926ejs_post_debug_entry(target_t *target)
 421 {
 422         armv4_5_common_t *armv4_5 = target->arch_info;
 423         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 424         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 425         arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 426
 427         /* examine cp15 control reg */
 428         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 1, 0), &arm926ejs->cp15_control_reg);
 429         jtag_execute_queue();
 430         DEBUG("cp15_control_reg: %8.8x", arm926ejs->cp15_control_reg);
 431
 432         if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1)
 433         {
 434                 u32 cache_type_reg;
 435                 /* identify caches */
 436                 arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 1, 0, 0), &cache_type_reg);
 437                 jtag_execute_queue();
 438                 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 439         }
 440
 441         arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
 442         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
 443         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
 444
 445         /* save i/d fault status and address register */
 446         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 5, 0), &arm926ejs->d_fsr);
 447         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 1, 5, 0), &arm926ejs->i_fsr);
 448         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 6, 0), &arm926ejs->d_far);
 449
 450         DEBUG("D FSR: 0x%8.8x, D FAR: 0x%8.8x, I FSR: 0x%8.8x",
 451                 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
 452
 453
 454         u32 cache_dbg_ctrl;
 455
 456         /* read-modify-write CP15 cache debug control register
 457          * to disable I/D-cache linefills and force WT */
 458         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(7, 0, 15, 0), &cache_dbg_ctrl);
 459         cache_dbg_ctrl |= 0x7;
 460         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(7, 0, 15, 0), cache_dbg_ctrl);
 461 }
 462
 463 void arm926ejs_pre_restore_context(target_t *target)
 464 {
 465         armv4_5_common_t *armv4_5 = target->arch_info;
 466         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 467         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 468         arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 469
 470         /* restore i/d fault status and address register */
 471         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 5, 0), arm926ejs->d_fsr);
 472         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 1, 5, 0), arm926ejs->i_fsr);
 473         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 6, 0), arm926ejs->d_far);
 474
 475         u32 cache_dbg_ctrl;
 476
 477         /* read-modify-write CP15 cache debug control register
 478          * to reenable I/D-cache linefills and disable WT */
 479         arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(7, 0, 15, 0), &cache_dbg_ctrl);
 480         cache_dbg_ctrl &= ~0x7;
 481         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(7, 0, 15, 0), cache_dbg_ctrl);
 482 }
 483
 484 int arm926ejs_get_arch_pointers(target_t *target, armv4_5_common_t **armv4_5_p, arm7_9_common_t **arm7_9_p, arm9tdmi_common_t **arm9tdmi_p, arm926ejs_common_t **arm926ejs_p)
 485 {
 486         armv4_5_common_t *armv4_5 = target->arch_info;
 487         arm7_9_common_t *arm7_9;
 488         arm9tdmi_common_t *arm9tdmi;
 489         arm926ejs_common_t *arm926ejs;
 490
 491         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 492         {
 493                 return -1;
 494         }
 495
 496         arm7_9 = armv4_5->arch_info;
 497         if (arm7_9->common_magic != ARM7_9_COMMON_MAGIC)
 498         {
 499                 return -1;
 500         }
 501
 502         arm9tdmi = arm7_9->arch_info;
 503         if (arm9tdmi->common_magic != ARM9TDMI_COMMON_MAGIC)
 504         {
 505                 return -1;
 506         }
 507
 508         arm926ejs = arm9tdmi->arch_info;
 509         if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC)
 510         {
 511                 return -1;
 512         }
 513
 514         *armv4_5_p = armv4_5;
 515         *arm7_9_p = arm7_9;
 516         *arm9tdmi_p = arm9tdmi;
 517         *arm926ejs_p = arm926ejs;
 518
 519         return ERROR_OK;
 520 }
 521
 522 int arm926ejs_arch_state(struct target_s *target, char *buf, int buf_size)
 523 {
 524         armv4_5_common_t *armv4_5 = target->arch_info;
 525         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 526         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 527         arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 528
 529         char *state[] =
 530         {
 531                 "disabled", "enabled"
 532         };
 533
 534         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 535         {
 536                 ERROR("BUG: called for a non-ARMv4/5 target");
 537                 exit(-1);
 538         }
 539
 540         snprintf(buf, buf_size,
 541                         "target halted in %s state due to %s, current mode: %s\n"
 542                         "cpsr: 0x%8.8x pc: 0x%8.8x\n"
 543                         "MMU: %s, D-Cache: %s, I-Cache: %s",
 544                          armv4_5_state_strings[armv4_5->core_state],
 545                          target_debug_reason_strings[target->debug_reason],
 546                          armv4_5_mode_strings[armv4_5_mode_to_number(armv4_5->core_mode)],
 547                          buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32),
 548                          buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 549                          state[arm926ejs->armv4_5_mmu.mmu_enabled],
 550                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 551                          state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 552
 553         return ERROR_OK;
 554 }
 555
 556 int arm926ejs_soft_reset_halt(struct target_s *target)
 557 {
 558         armv4_5_common_t *armv4_5 = target->arch_info;
 559         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 560         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 561         arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 562         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 563
 564         if (target->state == TARGET_RUNNING)
 565         {
 566                 target->type->halt(target);
 567         }
 568
 569         while (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 570         {
 571                 embeddedice_read_reg(dbg_stat);
 572                 jtag_execute_queue();
 573         }
 574
 575         target->state = TARGET_HALTED;
 576
 577         /* SVC, ARM state, IRQ and FIQ disabled */
 578         buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8, 0xd3);
 579         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 1;
 580         armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
 581
 582         /* start fetching from 0x0 */
 583         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, 0x0);
 584         armv4_5->core_cache->reg_list[15].dirty = 1;
 585         armv4_5->core_cache->reg_list[15].valid = 1;
 586
 587         armv4_5->core_mode = ARMV4_5_MODE_SVC;
 588         armv4_5->core_state = ARMV4_5_STATE_ARM;
 589
 590         arm926ejs_disable_mmu_caches(target, 1, 1, 1);
 591         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 592         arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
 593         arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
 594
 595         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 596
 597         return ERROR_OK;
 598 }
 599
 600 int arm926ejs_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
 601 {
 602         int retval;
 603         armv4_5_common_t *armv4_5 = target->arch_info;
 604         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 605         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 606         arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 607
 608         if ((retval = arm7_9_write_memory(target, address, size, count, buffer)) != ERROR_OK)
 609                 return retval;
 610
 611         /* If ICache is enabled, we have to invalidate affected ICache lines
 612          * the DCache is forced to write-through, so we don't have to clean it here
 613          */
 614         if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
 615         {
 616                 if (count <= 1)
 617                 {
 618                         /* invalidate ICache single entry with MVA */
 619                         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 1, 7, 5), address);
 620                 }
 621                 else
 622                 {
 623                         /* invalidate ICache */
 624                         arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(0, 0, 7, 5), address);
 625                 }
 626         }
 627
 628         return retval;
 629 }
 630
 631 int arm926ejs_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 632 {
 633         arm9tdmi_init_target(cmd_ctx, target);
 634
 635         return ERROR_OK;
 636
 637 }
 638
 639 int arm926ejs_quit()
 640 {
 641
 642         return ERROR_OK;
 643 }
 644
 645 int arm926ejs_init_arch_info(target_t *target, arm926ejs_common_t *arm926ejs, int chain_pos, char *variant)
 646 {
 647         arm9tdmi_common_t *arm9tdmi = &arm926ejs->arm9tdmi_common;
 648         arm7_9_common_t *arm7_9 = &arm9tdmi->arm7_9_common;
 649
 650         /* initialize arm9tdmi specific info (including arm7_9 and armv4_5)
 651          */
 652         arm9tdmi_init_arch_info(target, arm9tdmi, chain_pos, variant);
 653
 654         arm9tdmi->arch_info = arm926ejs;
 655         arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
 656
 657         arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
 658         arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
 659
 660         arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
 661         arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
 662         arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
 663         arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
 664         arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
 665         arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
 666         arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
 667         arm926ejs->armv4_5_mmu.mmu_enabled = 0;
 668
 669         arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
 670
 671         /* The ARM926EJ-S implements the ARMv5TE architecture which
 672          * has the BKPT instruction, so we don't have to use a watchpoint comparator
 673          */
 674         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
 675         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
 676
 677         arm7_9->sw_bkpts_use_wp = 0;
 678         arm7_9->sw_bkpts_enabled = 1;
 679
 680         return ERROR_OK;
 681 }
 682
 683 int arm926ejs_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 684 {
 685         int chain_pos;
 686         char *variant = NULL;
 687         arm926ejs_common_t *arm926ejs = malloc(sizeof(arm926ejs_common_t));
 688
 689         if (argc < 4)
 690         {
 691                 ERROR("'target arm926ejs' requires at least one additional argument");
 692                 exit(-1);
 693         }
 694
 695         chain_pos = strtoul(args[3], NULL, 0);
 696
 697         if (argc >= 5)
 698                 variant = args[4];
 699
 700         DEBUG("chain_pos: %i, variant: %s", chain_pos, variant);
 701
 702         arm926ejs_init_arch_info(target, arm926ejs, chain_pos, variant);
 703
 704         return ERROR_OK;
 705 }
 706
 707 int arm926ejs_register_commands(struct command_context_s *cmd_ctx)
 708 {
 709         int retval;
 710         command_t *arm926ejs_cmd;
 711
 712
 713         retval = arm9tdmi_register_commands(cmd_ctx);
 714
 715         arm926ejs_cmd = register_command(cmd_ctx, NULL, "arm926ejs", NULL, COMMAND_ANY, "arm926ejs specific commands");
 716
 717         register_command(cmd_ctx, arm926ejs_cmd, "cp15", arm926ejs_handle_cp15_command, COMMAND_EXEC, "display/modify cp15 register <opcode_1> <opcode_2> <CRn> <CRm> [value]");
 718
 719         register_command(cmd_ctx, arm926ejs_cmd, "cache_info", arm926ejs_handle_cache_info_command, COMMAND_EXEC, "display information about target caches");
 720         register_command(cmd_ctx, arm926ejs_cmd, "virt2phys", arm926ejs_handle_virt2phys_command, COMMAND_EXEC, "translate va to pa <va>");
 721
 722         register_command(cmd_ctx, arm926ejs_cmd, "mdw_phys", arm926ejs_handle_md_phys_command, COMMAND_EXEC, "display memory words <physical addr> [count]");
 723         register_command(cmd_ctx, arm926ejs_cmd, "mdh_phys", arm926ejs_handle_md_phys_command, COMMAND_EXEC, "display memory half-words <physical addr> [count]");
 724         register_command(cmd_ctx, arm926ejs_cmd, "mdb_phys", arm926ejs_handle_md_phys_command, COMMAND_EXEC, "display memory bytes <physical addr> [count]");
 725
 726         register_command(cmd_ctx, arm926ejs_cmd, "mww_phys", arm926ejs_handle_mw_phys_command, COMMAND_EXEC, "write memory word <physical addr> <value>");
 727         register_command(cmd_ctx, arm926ejs_cmd, "mwh_phys", arm926ejs_handle_mw_phys_command, COMMAND_EXEC, "write memory half-word <physical addr> <value>");
 728         register_command(cmd_ctx, arm926ejs_cmd, "mwb_phys", arm926ejs_handle_mw_phys_command, COMMAND_EXEC, "write memory byte <physical addr> <value>");
 729
 730         return ERROR_OK;
 731 }
 732
 733 int arm926ejs_handle_cp15_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 734 {
 735         int retval;
 736         target_t *target = get_current_target(cmd_ctx);
 737         armv4_5_common_t *armv4_5;
 738         arm7_9_common_t *arm7_9;
 739         arm9tdmi_common_t *arm9tdmi;
 740         arm926ejs_common_t *arm926ejs;
 741         int opcode_1;
 742         int opcode_2;
 743         int CRn;
 744         int CRm;
 745
 746         if ((argc < 4) || (argc > 5))
 747         {
 748                 command_print(cmd_ctx, "usage: arm926ejs cp15 <opcode_1> <opcode_2> <CRn> <CRm> [value]");
 749                 return ERROR_OK;
 750         }
 751
 752         opcode_1 = strtoul(args[0], NULL, 0);
 753         opcode_2 = strtoul(args[1], NULL, 0);
 754         CRn = strtoul(args[2], NULL, 0);
 755         CRm = strtoul(args[3], NULL, 0);
 756
 757         if (arm926ejs_get_arch_pointers(target, &armv4_5, &arm7_9, &arm9tdmi, &arm926ejs) != ERROR_OK)
 758         {
 759                 command_print(cmd_ctx, "current target isn't an ARM926EJ-S target");
 760                 return ERROR_OK;
 761         }
 762
 763         if (target->state != TARGET_HALTED)
 764         {
 765                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
 766                 return ERROR_OK;
 767         }
 768
 769         if (argc == 4)
 770         {
 771                 u32 value;
 772                 if ((retval = arm926ejs_read_cp15(target, ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm), &value)) != ERROR_OK)
 773                 {
 774                         command_print(cmd_ctx, "couldn't access register");
 775                         return ERROR_OK;
 776                 }
 777                 jtag_execute_queue();
 778
 779                 command_print(cmd_ctx, "%i %i %i %i: %8.8x", opcode_1, opcode_2, CRn, CRm, value);
 780         }
 781         else
 782         {
 783                 u32 value = strtoul(args[4], NULL, 0);
 784                 if ((retval = arm926ejs_write_cp15(target, ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm), value)) != ERROR_OK)
 785                 {
 786                         command_print(cmd_ctx, "couldn't access register");
 787                         return ERROR_OK;
 788                 }
 789                 command_print(cmd_ctx, "%i %i %i %i: %8.8x", opcode_1, opcode_2, CRn, CRm, value);
 790         }
 791
 792         return ERROR_OK;
 793 }
 794
 795 int arm926ejs_handle_cache_info_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 796 {
 797         target_t *target = get_current_target(cmd_ctx);
 798         armv4_5_common_t *armv4_5;
 799         arm7_9_common_t *arm7_9;
 800         arm9tdmi_common_t *arm9tdmi;
 801         arm926ejs_common_t *arm926ejs;
 802
 803         if (arm926ejs_get_arch_pointers(target, &armv4_5, &arm7_9, &arm9tdmi, &arm926ejs) != ERROR_OK)
 804         {
 805                 command_print(cmd_ctx, "current target isn't an ARM926EJ-S target");
 806                 return ERROR_OK;
 807         }
 808
 809         return armv4_5_handle_cache_info_command(cmd_ctx, &arm926ejs->armv4_5_mmu.armv4_5_cache);
 810 }
 811
 812 int arm926ejs_handle_virt2phys_command(command_context_t *cmd_ctx, char *cmd, char **args, int argc)
 813 {
 814         target_t *target = get_current_target(cmd_ctx);
 815         armv4_5_common_t *armv4_5;
 816         arm7_9_common_t *arm7_9;
 817         arm9tdmi_common_t *arm9tdmi;
 818         arm926ejs_common_t *arm926ejs;
 819         arm_jtag_t *jtag_info;
 820
 821         if (arm926ejs_get_arch_pointers(target, &armv4_5, &arm7_9, &arm9tdmi, &arm926ejs) != ERROR_OK)
 822         {
 823                 command_print(cmd_ctx, "current target isn't an ARM926EJ-S target");
 824                 return ERROR_OK;
 825         }
 826
 827         jtag_info = &arm7_9->jtag_info;
 828
 829         if (target->state != TARGET_HALTED)
 830         {
 831                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
 832                 return ERROR_OK;
 833         }
 834
 835         return armv4_5_mmu_handle_virt2phys_command(cmd_ctx, cmd, args, argc, target, &arm926ejs->armv4_5_mmu);
 836 }
 837
 838 int arm926ejs_handle_md_phys_command(command_context_t *cmd_ctx, char *cmd, char **args, int argc)
 839 {
 840         target_t *target = get_current_target(cmd_ctx);
 841         armv4_5_common_t *armv4_5;
 842         arm7_9_common_t *arm7_9;
 843         arm9tdmi_common_t *arm9tdmi;
 844         arm926ejs_common_t *arm926ejs;
 845         arm_jtag_t *jtag_info;
 846
 847         if (arm926ejs_get_arch_pointers(target, &armv4_5, &arm7_9, &arm9tdmi, &arm926ejs) != ERROR_OK)
 848         {
 849                 command_print(cmd_ctx, "current target isn't an ARM926EJ-S target");
 850                 return ERROR_OK;
 851         }
 852
 853         jtag_info = &arm7_9->jtag_info;
 854
 855         if (target->state != TARGET_HALTED)
 856         {
 857                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
 858                 return ERROR_OK;
 859         }
 860
 861         return armv4_5_mmu_handle_md_phys_command(cmd_ctx, cmd, args, argc, target, &arm926ejs->armv4_5_mmu);
 862 }
 863
 864 int arm926ejs_handle_mw_phys_command(command_context_t *cmd_ctx, char *cmd, char **args, int argc)
 865 {
 866         target_t *target = get_current_target(cmd_ctx);
 867         armv4_5_common_t *armv4_5;
 868         arm7_9_common_t *arm7_9;
 869         arm9tdmi_common_t *arm9tdmi;
 870         arm926ejs_common_t *arm926ejs;
 871         arm_jtag_t *jtag_info;
 872
 873         if (arm926ejs_get_arch_pointers(target, &armv4_5, &arm7_9, &arm9tdmi, &arm926ejs) != ERROR_OK)
 874         {
 875                 command_print(cmd_ctx, "current target isn't an ARM926EJ-S target");
 876                 return ERROR_OK;
 877         }
 878
 879         jtag_info = &arm7_9->jtag_info;
 880
 881         if (target->state != TARGET_HALTED)
 882         {
 883                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
 884                 return ERROR_OK;
 885         }
 886
 887         return armv4_5_mmu_handle_mw_phys_command(cmd_ctx, cmd, args, argc, target, &arm926ejs->armv4_5_mmu);
 888 }