src/target/arm9tdmi.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 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 "arm9tdmi.h"
  25
  26 #include "arm7_9_common.h"
  27 #include "register.h"
  28 #include "target.h"
  29 #include "armv4_5.h"
  30 #include "embeddedice.h"
  31 #include "log.h"
  32 #include "jtag.h"
  33 #include "arm_jtag.h"
  34
  35 #include <stdlib.h>
  36 #include <string.h>
  37
  38 #if 0
  39 #define _DEBUG_INSTRUCTION_EXECUTION_
  40 #endif
  41
  42 /* cli handling */
  43 int arm9tdmi_register_commands(struct command_context_s *cmd_ctx);
  44
  45 /* forward declarations */
  46 int arm9tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
  47 int arm9tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  48 int arm9tdmi_quit();
  49
  50 target_type_t arm9tdmi_target =
  51 {
  52         .name = "arm9tdmi",
  53
  54         .poll = arm7_9_poll,
  55         .arch_state = armv4_5_arch_state,
  56
  57         .halt = arm7_9_halt,
  58         .resume = arm7_9_resume,
  59         .step = arm7_9_step,
  60
  61         .assert_reset = arm7_9_assert_reset,
  62         .deassert_reset = arm7_9_deassert_reset,
  63         .soft_reset_halt = arm7_9_soft_reset_halt,
  64
  65         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  66
  67         .read_memory = arm7_9_read_memory,
  68         .write_memory = arm7_9_write_memory,
  69         .bulk_write_memory = arm7_9_bulk_write_memory,
  70
  71         .add_breakpoint = arm7_9_add_breakpoint,
  72         .remove_breakpoint = arm7_9_remove_breakpoint,
  73         .add_watchpoint = arm7_9_add_watchpoint,
  74         .remove_watchpoint = arm7_9_remove_watchpoint,
  75
  76         .register_commands = arm9tdmi_register_commands,
  77         .target_command = arm9tdmi_target_command,
  78         .init_target = arm9tdmi_init_target,
  79         .quit = arm9tdmi_quit
  80 };
  81
  82 int arm9tdmi_examine_debug_reason(target_t *target)
  83 {
  84         /* get pointers to arch-specific information */
  85         armv4_5_common_t *armv4_5 = target->arch_info;
  86         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  87
  88         /* only check the debug reason if we don't know it already */
  89         if ((target->debug_reason != DBG_REASON_DBGRQ)
  90                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
  91         {
  92                 scan_field_t fields[3];
  93                 u8 databus[4];
  94                 u8 instructionbus[4];
  95                 u8 debug_reason;
  96
  97                 jtag_add_end_state(TAP_PD);
  98
  99                 fields[0].device = arm7_9->jtag_info.chain_pos;
 100                 fields[0].num_bits = 32;
 101                 fields[0].out_value = NULL;
 102                 fields[0].out_mask = NULL;
 103                 fields[0].in_value = databus;
 104                 fields[0].in_check_value = NULL;
 105                 fields[0].in_check_mask = NULL;
 106                 fields[0].in_handler = NULL;
 107                 fields[0].in_handler_priv = NULL;
 108
 109                 fields[1].device = arm7_9->jtag_info.chain_pos;
 110                 fields[1].num_bits = 3;
 111                 fields[1].out_value = NULL;
 112                 fields[1].out_mask = NULL;
 113                 fields[1].in_value = &debug_reason;
 114                 fields[1].in_check_value = NULL;
 115                 fields[1].in_check_mask = NULL;
 116                 fields[1].in_handler = NULL;
 117                 fields[1].in_handler_priv = NULL;
 118
 119                 fields[2].device = arm7_9->jtag_info.chain_pos;
 120                 fields[2].num_bits = 32;
 121                 fields[2].out_value = NULL;
 122                 fields[2].out_mask = NULL;
 123                 fields[2].in_value = instructionbus;
 124                 fields[2].in_check_value = NULL;
 125                 fields[2].in_check_mask = NULL;
 126                 fields[2].in_handler = NULL;
 127                 fields[2].in_handler_priv = NULL;
 128
 129                 arm_jtag_scann(&arm7_9->jtag_info, 0x1);
 130                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr);
 131
 132                 jtag_add_dr_scan(3, fields, TAP_PD);
 133                 jtag_execute_queue();
 134
 135                 fields[0].in_value = NULL;
 136                 fields[0].out_value = databus;
 137                 fields[1].in_value = NULL;
 138                 fields[1].out_value = &debug_reason;
 139                 fields[2].in_value = NULL;
 140                 fields[2].out_value = instructionbus;
 141
 142                 jtag_add_dr_scan(3, fields, TAP_PD);
 143
 144                 if (debug_reason & 0x4)
 145                         if (debug_reason & 0x2)
 146                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 147                 else
 148                         target->debug_reason = DBG_REASON_WATCHPOINT;
 149                 else
 150                         target->debug_reason = DBG_REASON_BREAKPOINT;
 151         }
 152
 153         return ERROR_OK;
 154 }
 155
 156 /* put an instruction in the ARM9TDMI pipeline or write the data bus, and optionally read data */
 157 int arm9tdmi_clock_out(arm_jtag_t *jtag_info, u32 instr, u32 out, u32 *in, int sysspeed)
 158 {
 159         scan_field_t fields[3];
 160         u8 out_buf[4];
 161         u8 instr_buf[4];
 162         u8 sysspeed_buf = 0x0;
 163
 164         /* prepare buffer */
 165         buf_set_u32(out_buf, 0, 32, out);
 166
 167         buf_set_u32(instr_buf, 0, 32, flip_u32(instr, 32));
 168
 169         if (sysspeed)
 170                 buf_set_u32(&sysspeed_buf, 2, 1, 1);
 171
 172         jtag_add_end_state(TAP_PD);
 173         arm_jtag_scann(jtag_info, 0x1);
 174         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr);
 175
 176         fields[0].device = jtag_info->chain_pos;
 177         fields[0].num_bits = 32;
 178         fields[0].out_value = out_buf;
 179         fields[0].out_mask = NULL;
 180         fields[0].in_value = NULL;
 181         if (in)
 182         {
 183                 fields[0].in_handler = arm_jtag_buf_to_u32;
 184                 fields[0].in_handler_priv = in;
 185         }
 186         else
 187         {
 188                 fields[0].in_handler = NULL;
 189                 fields[0].in_handler_priv = NULL;
 190         }
 191         fields[0].in_check_value = NULL;
 192         fields[0].in_check_mask = NULL;
 193
 194         fields[1].device = jtag_info->chain_pos;
 195         fields[1].num_bits = 3;
 196         fields[1].out_value = &sysspeed_buf;
 197         fields[1].out_mask = NULL;
 198         fields[1].in_value = NULL;
 199         fields[1].in_check_value = NULL;
 200         fields[1].in_check_mask = NULL;
 201         fields[1].in_handler = NULL;
 202         fields[1].in_handler_priv = NULL;
 203
 204         fields[2].device = jtag_info->chain_pos;
 205         fields[2].num_bits = 32;
 206         fields[2].out_value = instr_buf;
 207         fields[2].out_mask = NULL;
 208         fields[2].in_value = NULL;
 209         fields[2].in_check_value = NULL;
 210         fields[2].in_check_mask = NULL;
 211         fields[2].in_handler = NULL;
 212         fields[2].in_handler_priv = NULL;
 213
 214         jtag_add_dr_scan(3, fields, -1);
 215
 216         jtag_add_runtest(0, -1);
 217
 218 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 219         {
 220                 jtag_execute_queue();
 221
 222                 if (in)
 223                 {
 224                         DEBUG("instr: 0x%8.8x, out: 0x%8.8x, in: 0x%8.8x", instr, out, *in);
 225                 }
 226                 else
 227                         DEBUG("instr: 0x%8.8x, out: 0x%8.8x", instr, out);
 228         }
 229 #endif
 230
 231         return ERROR_OK;
 232 }
 233
 234 /* just read data (instruction and data-out = don't care) */
 235 int arm9tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 236 {
 237         scan_field_t fields[3];
 238
 239         jtag_add_end_state(TAP_PD);
 240         arm_jtag_scann(jtag_info, 0x1);
 241         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr);
 242
 243         fields[0].device = jtag_info->chain_pos;
 244         fields[0].num_bits = 32;
 245         fields[0].out_value = NULL;
 246         fields[0].out_mask = NULL;
 247         fields[0].in_value = NULL;
 248         fields[0].in_handler = arm_jtag_buf_to_u32;
 249         fields[0].in_handler_priv = in;
 250         fields[0].in_check_value = NULL;
 251         fields[0].in_check_mask = NULL;
 252
 253         fields[1].device = jtag_info->chain_pos;
 254         fields[1].num_bits = 3;
 255         fields[1].out_value = NULL;
 256         fields[1].out_mask = NULL;
 257         fields[1].in_value = NULL;
 258         fields[1].in_handler = NULL;
 259         fields[1].in_handler_priv = NULL;
 260         fields[1].in_check_value = NULL;
 261         fields[1].in_check_mask = NULL;
 262
 263         fields[2].device = jtag_info->chain_pos;
 264         fields[2].num_bits = 32;
 265         fields[2].out_value = NULL;
 266         fields[2].out_mask = NULL;
 267         fields[2].in_value = NULL;
 268         fields[2].in_check_value = NULL;
 269         fields[2].in_check_mask = NULL;
 270         fields[2].in_handler = NULL;
 271         fields[2].in_handler_priv = NULL;
 272
 273         jtag_add_dr_scan(3, fields, -1);
 274
 275         jtag_add_runtest(0, -1);
 276
 277 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 278         {
 279                 jtag_execute_queue();
 280
 281                 if (in)
 282                 {
 283                         DEBUG("in: 0x%8.8x", *in);
 284                 }
 285                 else
 286                 {
 287                         ERROR("BUG: called with in == NULL");
 288                 }
 289         }
 290 #endif
 291
 292         return ERROR_OK;
 293 }
 294
 295 /* clock the target, and read the databus
 296  * the *in pointer points to a buffer where elements of 'size' bytes
 297  * are stored in big (be==1) or little (be==0) endianness
 298  */
 299 int arm9tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
 300 {
 301         scan_field_t fields[3];
 302
 303         jtag_add_end_state(TAP_PD);
 304         arm_jtag_scann(jtag_info, 0x1);
 305         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr);
 306
 307         fields[0].device = jtag_info->chain_pos;
 308         fields[0].num_bits = 32;
 309         fields[0].out_value = NULL;
 310         fields[0].out_mask = NULL;
 311         fields[0].in_value = NULL;
 312         switch (size)
 313         {
 314                 case 4:
 315                         fields[0].in_handler = (be) ? arm_jtag_buf_to_be32 : arm_jtag_buf_to_le32;
 316                         break;
 317                 case 2:
 318                         fields[0].in_handler = (be) ? arm_jtag_buf_to_be16 : arm_jtag_buf_to_le16;
 319                         break;
 320                 case 1:
 321                         fields[0].in_handler = arm_jtag_buf_to_8;
 322                         break;
 323         }
 324         fields[0].in_handler_priv = in;
 325         fields[0].in_check_value = NULL;
 326         fields[0].in_check_mask = NULL;
 327
 328         fields[1].device = jtag_info->chain_pos;
 329         fields[1].num_bits = 3;
 330         fields[1].out_value = NULL;
 331         fields[1].out_mask = NULL;
 332         fields[1].in_value = NULL;
 333         fields[1].in_handler = NULL;
 334         fields[1].in_handler_priv = NULL;
 335         fields[1].in_check_value = NULL;
 336         fields[1].in_check_mask = NULL;
 337
 338         fields[2].device = jtag_info->chain_pos;
 339         fields[2].num_bits = 32;
 340         fields[2].out_value = NULL;
 341         fields[2].out_mask = NULL;
 342         fields[2].in_value = NULL;
 343         fields[2].in_check_value = NULL;
 344         fields[2].in_check_mask = NULL;
 345         fields[2].in_handler = NULL;
 346         fields[2].in_handler_priv = NULL;
 347
 348         jtag_add_dr_scan(3, fields, -1);
 349
 350         jtag_add_runtest(0, -1);
 351
 352 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 353         {
 354                 jtag_execute_queue();
 355
 356                 if (in)
 357                 {
 358                         DEBUG("in: 0x%8.8x", *in);
 359                 }
 360                 else
 361                 {
 362                         ERROR("BUG: called with in == NULL");
 363                 }
 364         }
 365 #endif
 366
 367         return ERROR_OK;
 368 }
 369
 370 void arm9tdmi_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 371 {
 372         /* get pointers to arch-specific information */
 373         armv4_5_common_t *armv4_5 = target->arch_info;
 374         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 375         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 376
 377         /* save r0 before using it and put system in ARM state
 378          * to allow common handling of ARM and THUMB debugging */
 379
 380         /* fetch STR r0, [r0] */
 381         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 382         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 383         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 384         /* STR r0, [r0] in Memory */
 385         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, r0, 0);
 386
 387         /* MOV r0, r15 fetched, STR in Decode */
 388         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), 0, NULL, 0);
 389         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 390         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 391         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 392         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 393         /* nothing fetched, STR r0, [r0] in Memory */
 394         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, pc, 0);
 395
 396         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 397         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), 0, NULL, 0);
 398         /* LDR in Decode */
 399         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 400         /* LDR in Execute */
 401         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 402         /* LDR in Memory (to account for interlock) */
 403         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 404
 405         /* fetch BX */
 406         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), 0, NULL, 0);
 407         /* NOP fetched, BX in Decode, MOV in Execute */
 408         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 409         /* NOP fetched, BX in Execute (1) */
 410         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 411
 412         jtag_execute_queue();
 413
 414         /* fix program counter:
 415          * MOV r0, r15 was the 5th instruction (+8)
 416          * reading PC in Thumb state gives address of instruction + 4
 417          */
 418         *pc -= 0xc;
 419 }
 420
 421 void arm9tdmi_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 422 {
 423         int i;
 424         /* get pointers to arch-specific information */
 425         armv4_5_common_t *armv4_5 = target->arch_info;
 426         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 427         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 428
 429         /* STMIA r0-15, [r0] at debug speed
 430          * register values will start to appear on 4th DCLK
 431          */
 432         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 433
 434         /* fetch NOP, STM in DECODE stage */
 435         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 436         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 437         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 438
 439         for (i = 0; i <= 15; i++)
 440         {
 441                 if (mask & (1 << i))
 442                         /* nothing fetched, STM in MEMORY (i'th cycle) */
 443                         arm9tdmi_clock_data_in(jtag_info, core_regs[i]);
 444         }
 445
 446 }
 447
 448 void arm9tdmi_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 449 {
 450         int i;
 451         /* get pointers to arch-specific information */
 452         armv4_5_common_t *armv4_5 = target->arch_info;
 453         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 454         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 455         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 456         u32 *buf_u32 = buffer;
 457         u16 *buf_u16 = buffer;
 458         u8 *buf_u8 = buffer;
 459
 460         /* STMIA r0-15, [r0] at debug speed
 461          * register values will start to appear on 4th DCLK
 462          */
 463         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 464
 465         /* fetch NOP, STM in DECODE stage */
 466         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 467         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 468         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 469
 470         for (i = 0; i <= 15; i++)
 471         {
 472                 if (mask & (1 << i))
 473                         /* nothing fetched, STM in MEMORY (i'th cycle) */
 474                         switch (size)
 475                         {
 476                                 case 4:
 477                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 478                                         break;
 479                                 case 2:
 480                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 481                                         break;
 482                                 case 1:
 483                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 484                                         break;
 485                         }
 486         }
 487
 488 }
 489
 490 void arm9tdmi_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 491 {
 492         /* get pointers to arch-specific information */
 493         armv4_5_common_t *armv4_5 = target->arch_info;
 494         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 495         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 496
 497         /* MRS r0, cpsr */
 498         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), 0, NULL, 0);
 499         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 500         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 501         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 502         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 503
 504         /* STR r0, [r15] */
 505         arm9tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), 0, NULL, 0);
 506         /* fetch NOP, STR in DECODE stage */
 507         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 508         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 509         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 510         /* nothing fetched, STR in MEMORY */
 511         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, xpsr, 0);
 512
 513 }
 514
 515 void arm9tdmi_write_xpsr(target_t *target, u32 xpsr, int spsr)
 516 {
 517         /* get pointers to arch-specific information */
 518         armv4_5_common_t *armv4_5 = target->arch_info;
 519         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 520         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 521
 522         DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 523
 524         /* MSR1 fetched */
 525         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), 0, NULL, 0);
 526         /* MSR2 fetched, MSR1 in DECODE */
 527         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), 0, NULL, 0);
 528         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 529         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), 0, NULL, 0);
 530         /* nothing fetched, MSR1 in EXECUTE (2) */
 531         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 532         /* nothing fetched, MSR1 in EXECUTE (3) */
 533         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 534         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 535         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), 0, NULL, 0);
 536         /* nothing fetched, MSR2 in EXECUTE (2) */
 537         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 538         /* nothing fetched, MSR2 in EXECUTE (3) */
 539         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 540         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 541         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 542         /* nothing fetched, MSR3 in EXECUTE (2) */
 543         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 544         /* nothing fetched, MSR3 in EXECUTE (3) */
 545         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 546         /* NOP fetched, MSR4 in EXECUTE (1) */
 547         /* last MSR writes flags, which takes only one cycle */
 548         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 549 }
 550
 551 void arm9tdmi_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 552 {
 553         /* get pointers to arch-specific information */
 554         armv4_5_common_t *armv4_5 = target->arch_info;
 555         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 556         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 557
 558         DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 559
 560         /* MSR fetched */
 561         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), 0, NULL, 0);
 562         /* NOP fetched, MSR in DECODE */
 563         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 564         /* NOP fetched, MSR in EXECUTE (1) */
 565         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 566
 567         /* rot == 4 writes flags, which takes only one cycle */
 568         if (rot != 4)
 569         {
 570                 /* nothing fetched, MSR in EXECUTE (2) */
 571                 arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 572                 /* nothing fetched, MSR in EXECUTE (3) */
 573                 arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 574         }
 575 }
 576
 577 void arm9tdmi_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 578 {
 579         int i;
 580         /* get pointers to arch-specific information */
 581         armv4_5_common_t *armv4_5 = target->arch_info;
 582         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 583         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 584
 585         /* LDMIA r0-15, [r0] at debug speed
 586         * register values will start to appear on 4th DCLK
 587         */
 588         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 589
 590         /* fetch NOP, LDM in DECODE stage */
 591         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 592         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 593         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 594
 595         for (i = 0; i <= 15; i++)
 596         {
 597                 if (mask & (1 << i))
 598                         /* nothing fetched, LDM still in EXECUTE (1+i cycle) */
 599                         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, core_regs[i], NULL, 0);
 600         }
 601         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 602
 603 }
 604
 605 void arm9tdmi_load_word_regs(target_t *target, u32 mask)
 606 {
 607         /* get pointers to arch-specific information */
 608         armv4_5_common_t *armv4_5 = target->arch_info;
 609         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 610         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 611
 612         /* put system-speed load-multiple into the pipeline */
 613         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), 0, NULL, 0);
 614         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 615
 616 }
 617
 618 void arm9tdmi_load_hword_reg(target_t *target, int num)
 619 {
 620         /* get pointers to arch-specific information */
 621         armv4_5_common_t *armv4_5 = target->arch_info;
 622         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 623         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 624
 625         /* put system-speed load half-word into the pipeline */
 626         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), 0, NULL, 0);
 627         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 628 }
 629
 630 void arm9tdmi_load_byte_reg(target_t *target, int num)
 631 {
 632         /* get pointers to arch-specific information */
 633         armv4_5_common_t *armv4_5 = target->arch_info;
 634         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 635         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 636
 637         /* put system-speed load byte into the pipeline */
 638         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), 0, NULL, 0);
 639         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 640
 641 }
 642
 643 void arm9tdmi_store_word_regs(target_t *target, u32 mask)
 644 {
 645         /* get pointers to arch-specific information */
 646         armv4_5_common_t *armv4_5 = target->arch_info;
 647         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 648         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 649
 650         /* put system-speed store-multiple into the pipeline */
 651         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), 0, NULL, 0);
 652         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 653
 654 }
 655
 656 void arm9tdmi_store_hword_reg(target_t *target, int num)
 657 {
 658         /* get pointers to arch-specific information */
 659         armv4_5_common_t *armv4_5 = target->arch_info;
 660         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 661         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 662
 663         /* put system-speed store half-word into the pipeline */
 664         arm9tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), 0, NULL, 0);
 665         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 666
 667 }
 668
 669 void arm9tdmi_store_byte_reg(target_t *target, int num)
 670 {
 671         /* get pointers to arch-specific information */
 672         armv4_5_common_t *armv4_5 = target->arch_info;
 673         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 674         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 675
 676         /* put system-speed store byte into the pipeline */
 677         arm9tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), 0, NULL, 0);
 678         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 679
 680 }
 681
 682 void arm9tdmi_write_pc(target_t *target, u32 pc)
 683 {
 684         /* get pointers to arch-specific information */
 685         armv4_5_common_t *armv4_5 = target->arch_info;
 686         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 687         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 688
 689         /* LDMIA r0-15, [r0] at debug speed
 690          * register values will start to appear on 4th DCLK
 691          */
 692         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), 0, NULL, 0);
 693
 694         /* fetch NOP, LDM in DECODE stage */
 695         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 696         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 697         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 698         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) (output data) */
 699         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, pc, NULL, 0);
 700         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 701         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 702         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 703         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 704         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 705         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 706
 707 }
 708
 709 void arm9tdmi_branch_resume(target_t *target)
 710 {
 711         /* get pointers to arch-specific information */
 712         armv4_5_common_t *armv4_5 = target->arch_info;
 713         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 714         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 715
 716         arm9tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffffc, 0), 0, NULL, 0);
 717         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 718
 719 }
 720
 721 void arm9tdmi_branch_resume_thumb(target_t *target)
 722 {
 723         DEBUG("");
 724
 725         /* get pointers to arch-specific information */
 726         armv4_5_common_t *armv4_5 = target->arch_info;
 727         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 728         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 729         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 730
 731         /* LDMIA r0-15, [r0] at debug speed
 732         * register values will start to appear on 4th DCLK
 733         */
 734         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), 0, NULL, 0);
 735
 736         /* fetch NOP, LDM in DECODE stage */
 737         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 738         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 739         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 740         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 741         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 742         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 743         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 744
 745         /* Branch and eXchange */
 746         arm9tdmi_clock_out(jtag_info, ARMV4_5_BX(0), 0, NULL, 0);
 747
 748         embeddedice_read_reg(dbg_stat);
 749
 750         /* fetch NOP, BX in DECODE stage */
 751         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 752
 753         embeddedice_read_reg(dbg_stat);
 754
 755         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 756         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 757
 758         /* target is now in Thumb state */
 759         embeddedice_read_reg(dbg_stat);
 760
 761         /* load r0 value, MOV_IM in Decode*/
 762         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), 0, NULL, 0);
 763         /* fetch NOP, LDR in Decode, MOV_IM in Execute */
 764         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 765         /* fetch NOP, LDR in Execute */
 766         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 767         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 768         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 769         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 770         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 771
 772         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 773         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 774
 775         embeddedice_read_reg(dbg_stat);
 776
 777         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f7), 0, NULL, 1);
 778         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 779
 780 }
 781
 782 void arm9tdmi_enable_single_step(target_t *target)
 783 {
 784         /* get pointers to arch-specific information */
 785         armv4_5_common_t *armv4_5 = target->arch_info;
 786         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 787         arm9tdmi_common_t *arm9 = arm7_9->arch_info;
 788
 789         if (arm9->has_single_step)
 790         {
 791                 buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 3, 1, 1);
 792                 embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 793         }
 794         else
 795         {
 796                 arm7_9_enable_eice_step(target);
 797         }
 798 }
 799
 800 void arm9tdmi_disable_single_step(target_t *target)
 801 {
 802         /* get pointers to arch-specific information */
 803         armv4_5_common_t *armv4_5 = target->arch_info;
 804         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 805         arm9tdmi_common_t *arm9 = arm7_9->arch_info;
 806
 807         if (arm9->has_single_step)
 808         {
 809                 buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 3, 1, 0);
 810                 embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 811         }
 812         else
 813         {
 814                 arm7_9_disable_eice_step(target);
 815         }
 816 }
 817
 818 void arm9tdmi_build_reg_cache(target_t *target)
 819 {
 820         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 821         /* get pointers to arch-specific information */
 822         armv4_5_common_t *armv4_5 = target->arch_info;
 823         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 824         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 825         arm9tdmi_common_t *arm9tdmi = arm7_9->arch_info;
 826
 827         embeddedice_reg_t *vec_catch_arch_info;
 828
 829         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 830         armv4_5->core_cache = (*cache_p);
 831
 832         /* one extra register (vector catch) */
 833         (*cache_p)->next = embeddedice_build_reg_cache(target, jtag_info, 1);
 834         arm7_9->eice_cache = (*cache_p)->next;
 835
 836         if (arm9tdmi->has_monitor_mode)
 837                 (*cache_p)->next->reg_list[EICE_DBG_CTRL].size = 6;
 838         else
 839                 (*cache_p)->next->reg_list[EICE_DBG_CTRL].size = 4;
 840
 841         (*cache_p)->next->reg_list[EICE_DBG_STAT].size = 5;
 842
 843         (*cache_p)->next->reg_list[EICE_VEC_CATCH].name = "vector catch";
 844         (*cache_p)->next->reg_list[EICE_VEC_CATCH].dirty = 0;
 845         (*cache_p)->next->reg_list[EICE_VEC_CATCH].valid = 0;
 846         (*cache_p)->next->reg_list[EICE_VEC_CATCH].bitfield_desc = NULL;
 847         (*cache_p)->next->reg_list[EICE_VEC_CATCH].num_bitfields = 0;
 848         (*cache_p)->next->reg_list[EICE_VEC_CATCH].size = 8;
 849         (*cache_p)->next->reg_list[EICE_VEC_CATCH].value = calloc(1, 4);
 850         vec_catch_arch_info = (*cache_p)->next->reg_list[EICE_VEC_CATCH].arch_info;
 851         vec_catch_arch_info->addr = 0x2;
 852
 853 }
 854
 855 int arm9tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 856 {
 857
 858         arm9tdmi_build_reg_cache(target);
 859
 860         return ERROR_OK;
 861
 862 }
 863
 864 int arm9tdmi_quit()
 865 {
 866
 867         return ERROR_OK;
 868 }
 869
 870 int arm9tdmi_init_arch_info(target_t *target, arm9tdmi_common_t *arm9tdmi, int chain_pos, char *variant)
 871 {
 872         armv4_5_common_t *armv4_5;
 873         arm7_9_common_t *arm7_9;
 874
 875         arm7_9 = &arm9tdmi->arm7_9_common;
 876         armv4_5 = &arm7_9->armv4_5_common;
 877
 878         /* prepare JTAG information for the new target */
 879         arm7_9->jtag_info.chain_pos = chain_pos;
 880         arm7_9->jtag_info.scann_size = 5;
 881
 882         /* register arch-specific functions */
 883         arm7_9->examine_debug_reason = arm9tdmi_examine_debug_reason;
 884         arm7_9->change_to_arm = arm9tdmi_change_to_arm;
 885         arm7_9->read_core_regs = arm9tdmi_read_core_regs;
 886         arm7_9->read_core_regs_target_buffer = arm9tdmi_read_core_regs_target_buffer;
 887         arm7_9->read_xpsr = arm9tdmi_read_xpsr;
 888
 889         arm7_9->write_xpsr = arm9tdmi_write_xpsr;
 890         arm7_9->write_xpsr_im8 = arm9tdmi_write_xpsr_im8;
 891         arm7_9->write_core_regs = arm9tdmi_write_core_regs;
 892
 893         arm7_9->load_word_regs = arm9tdmi_load_word_regs;
 894         arm7_9->load_hword_reg = arm9tdmi_load_hword_reg;
 895         arm7_9->load_byte_reg = arm9tdmi_load_byte_reg;
 896
 897         arm7_9->store_word_regs = arm9tdmi_store_word_regs;
 898         arm7_9->store_hword_reg = arm9tdmi_store_hword_reg;
 899         arm7_9->store_byte_reg = arm9tdmi_store_byte_reg;
 900
 901         arm7_9->write_pc = arm9tdmi_write_pc;
 902         arm7_9->branch_resume = arm9tdmi_branch_resume;
 903         arm7_9->branch_resume_thumb = arm9tdmi_branch_resume_thumb;
 904
 905         arm7_9->enable_single_step = arm9tdmi_enable_single_step;
 906         arm7_9->disable_single_step = arm9tdmi_disable_single_step;
 907
 908         arm7_9->pre_debug_entry = NULL;
 909         arm7_9->post_debug_entry = NULL;
 910
 911         arm7_9->pre_restore_context = NULL;
 912         arm7_9->post_restore_context = NULL;
 913
 914         /* initialize arch-specific breakpoint handling */
 915         buf_set_u32((u8*)(&arm7_9->arm_bkpt), 0, 32, 0xdeeedeee);
 916         buf_set_u32((u8*)(&arm7_9->thumb_bkpt), 0, 16, 0xdeee);
 917
 918         arm7_9->sw_bkpts_use_wp = 1;
 919         arm7_9->sw_bkpts_enabled = 0;
 920         arm7_9->dbgreq_adjust_pc = 3;
 921         arm7_9->arch_info = arm9tdmi;
 922
 923         arm9tdmi->common_magic = ARM9TDMI_COMMON_MAGIC;
 924         arm9tdmi->has_monitor_mode = 0;
 925         arm9tdmi->has_single_step = 0;
 926         arm9tdmi->arch_info = NULL;
 927
 928         if (variant)
 929         {
 930                 if (strcmp(variant, "arm920t") == 0)
 931                         arm9tdmi->has_single_step = 1;
 932                 else if (strcmp(variant, "arm922t") == 0)
 933                         arm9tdmi->has_single_step = 1;
 934                 else if (strcmp(variant, "arm940t") == 0)
 935                         arm9tdmi->has_single_step = 1;
 936                 arm9tdmi->variant = strdup(variant);
 937         }
 938         else
 939                 arm9tdmi->variant = strdup("");
 940
 941         arm7_9_init_arch_info(target, arm7_9);
 942
 943         /* override use of DBGRQ, this is safe on ARM9TDMI */
 944         arm7_9->use_dbgrq = 1;
 945
 946         return ERROR_OK;
 947 }
 948
 949 /* target arm9tdmi <endianess> <startup_mode> <chain_pos> <variant>*/
 950 int arm9tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 951 {
 952         int chain_pos;
 953         char *variant = NULL;
 954         arm9tdmi_common_t *arm9tdmi = malloc(sizeof(arm9tdmi_common_t));
 955
 956         if (argc < 4)
 957         {
 958                 ERROR("'target arm9tdmi' requires at least one additional argument");
 959                 exit(-1);
 960         }
 961
 962         chain_pos = strtoul(args[3], NULL, 0);
 963
 964         if (argc >= 5)
 965                 variant = args[4];
 966
 967         arm9tdmi_init_arch_info(target, arm9tdmi, chain_pos, variant);
 968
 969         return ERROR_OK;
 970 }
 971
 972 int arm9tdmi_register_commands(struct command_context_s *cmd_ctx)
 973 {
 974         int retval;
 975
 976         retval = arm7_9_register_commands(cmd_ctx);
 977
 978         return ERROR_OK;
 979
 980 }
 981