src/target/arm7tdmi.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 "arm7tdmi.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 "etm.h"
  32 #include "log.h"
  33 #include "jtag.h"
  34 #include "arm_jtag.h"
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #if 0
  40 #define _DEBUG_INSTRUCTION_EXECUTION_
  41 #endif
  42
  43 /* cli handling */
  44 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx);
  45
  46 /* forward declarations */
  47 int arm7tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
  48 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  49 int arm7tdmi_quit();
  50
  51 /* target function declarations */
  52 enum target_state arm7tdmi_poll(struct target_s *target);
  53 int arm7tdmi_halt(target_t *target);
  54
  55 target_type_t arm7tdmi_target =
  56 {
  57         .name = "arm7tdmi",
  58
  59         .poll = arm7_9_poll,
  60         .arch_state = armv4_5_arch_state,
  61
  62         .halt = arm7_9_halt,
  63         .resume = arm7_9_resume,
  64         .step = arm7_9_step,
  65
  66         .assert_reset = arm7_9_assert_reset,
  67         .deassert_reset = arm7_9_deassert_reset,
  68         .soft_reset_halt = arm7_9_soft_reset_halt,
  69         .prepare_reset_halt = arm7_9_prepare_reset_halt,
  70
  71         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  72
  73         .read_memory = arm7_9_read_memory,
  74         .write_memory = arm7_9_write_memory,
  75         .bulk_write_memory = arm7_9_bulk_write_memory,
  76
  77         .run_algorithm = armv4_5_run_algorithm,
  78
  79         .add_breakpoint = arm7_9_add_breakpoint,
  80         .remove_breakpoint = arm7_9_remove_breakpoint,
  81         .add_watchpoint = arm7_9_add_watchpoint,
  82         .remove_watchpoint = arm7_9_remove_watchpoint,
  83
  84         .register_commands = arm7tdmi_register_commands,
  85         .target_command = arm7tdmi_target_command,
  86         .init_target = arm7tdmi_init_target,
  87         .quit = arm7tdmi_quit
  88 };
  89
  90 int arm7tdmi_examine_debug_reason(target_t *target)
  91 {
  92         /* get pointers to arch-specific information */
  93         armv4_5_common_t *armv4_5 = target->arch_info;
  94         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  95
  96         /* only check the debug reason if we don't know it already */
  97         if ((target->debug_reason != DBG_REASON_DBGRQ)
  98                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
  99         {
 100                 scan_field_t fields[2];
 101                 u8 databus[4];
 102                 u8 breakpoint;
 103
 104                 jtag_add_end_state(TAP_PD);
 105
 106                 fields[0].device = arm7_9->jtag_info.chain_pos;
 107                 fields[0].num_bits = 1;
 108                 fields[0].out_value = NULL;
 109                 fields[0].out_mask = NULL;
 110                 fields[0].in_value = &breakpoint;
 111                 fields[0].in_check_value = NULL;
 112                 fields[0].in_check_mask = NULL;
 113                 fields[0].in_handler = NULL;
 114                 fields[0].in_handler_priv = NULL;
 115
 116                 fields[1].device = arm7_9->jtag_info.chain_pos;
 117                 fields[1].num_bits = 32;
 118                 fields[1].out_value = NULL;
 119                 fields[1].out_mask = NULL;
 120                 fields[1].in_value = databus;
 121                 fields[1].in_check_value = NULL;
 122                 fields[1].in_check_mask = NULL;
 123                 fields[1].in_handler = NULL;
 124                 fields[1].in_handler_priv = NULL;
 125
 126                 arm_jtag_scann(&arm7_9->jtag_info, 0x1);
 127                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
 128
 129                 jtag_add_dr_scan(2, fields, TAP_PD, NULL);
 130                 jtag_execute_queue();
 131
 132                 fields[0].in_value = NULL;
 133                 fields[0].out_value = &breakpoint;
 134                 fields[1].in_value = NULL;
 135                 fields[1].out_value = databus;
 136
 137                 jtag_add_dr_scan(2, fields, TAP_PD, NULL);
 138
 139                 if (breakpoint & 1)
 140                         target->debug_reason = DBG_REASON_WATCHPOINT;
 141                 else
 142                         target->debug_reason = DBG_REASON_BREAKPOINT;
 143         }
 144
 145         return ERROR_OK;
 146 }
 147
 148 /* put an instruction in the ARM7TDMI pipeline or write the data bus, and optionally read data */
 149 int arm7tdmi_clock_out(arm_jtag_t *jtag_info, u32 out, u32 *in, int breakpoint)
 150 {
 151         scan_field_t fields[2];
 152         u8 out_buf[4];
 153         u8 breakpoint_buf;
 154
 155         buf_set_u32(out_buf, 0, 32, flip_u32(out, 32));
 156         buf_set_u32(&breakpoint_buf, 0, 1, breakpoint);
 157
 158         jtag_add_end_state(TAP_PD);
 159         arm_jtag_scann(jtag_info, 0x1);
 160         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 161
 162         fields[0].device = jtag_info->chain_pos;
 163         fields[0].num_bits = 1;
 164         fields[0].out_value = &breakpoint_buf;
 165         fields[0].out_mask = NULL;
 166         fields[0].in_value = NULL;
 167         fields[0].in_check_value = NULL;
 168         fields[0].in_check_mask = NULL;
 169         fields[0].in_handler = NULL;
 170         fields[0].in_handler_priv = NULL;
 171
 172         fields[1].device = jtag_info->chain_pos;
 173         fields[1].num_bits = 32;
 174         fields[1].out_value = out_buf;
 175         fields[1].out_mask = NULL;
 176         fields[1].in_value = NULL;
 177         if (in)
 178         {
 179                 fields[1].in_handler = arm_jtag_buf_to_u32_flip;
 180                 fields[1].in_handler_priv = in;
 181         }
 182         else
 183         {
 184                 fields[1].in_handler = NULL;
 185                 fields[1].in_handler_priv = NULL;
 186         }
 187         fields[1].in_check_value = NULL;
 188         fields[1].in_check_mask = NULL;
 189
 190         jtag_add_dr_scan(2, fields, -1, NULL);
 191
 192         jtag_add_runtest(0, -1);
 193
 194 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 195 {
 196                 jtag_execute_queue();
 197
 198                 if (in)
 199                 {
 200                         DEBUG("out: 0x%8.8x, in: 0x%8.8x", out, *in);
 201                 }
 202                 else
 203                         DEBUG("out: 0x%8.8x", out);
 204 }
 205 #endif
 206
 207         return ERROR_OK;
 208 }
 209
 210 /* clock the target, reading the databus */
 211 int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 212 {
 213         scan_field_t fields[2];
 214
 215         jtag_add_end_state(TAP_PD);
 216         arm_jtag_scann(jtag_info, 0x1);
 217         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 218
 219         fields[0].device = jtag_info->chain_pos;
 220         fields[0].num_bits = 1;
 221         fields[0].out_value = NULL;
 222         fields[0].out_mask = NULL;
 223         fields[0].in_value = NULL;
 224         fields[0].in_check_value = NULL;
 225         fields[0].in_check_mask = NULL;
 226         fields[0].in_handler = NULL;
 227         fields[0].in_handler_priv = NULL;
 228
 229         fields[1].device = jtag_info->chain_pos;
 230         fields[1].num_bits = 32;
 231         fields[1].out_value = NULL;
 232         fields[1].out_mask = NULL;
 233         fields[1].in_value = NULL;
 234         fields[1].in_handler = arm_jtag_buf_to_u32_flip;
 235         fields[1].in_handler_priv = in;
 236         fields[1].in_check_value = NULL;
 237         fields[1].in_check_mask = NULL;
 238
 239         jtag_add_dr_scan(2, fields, -1, NULL);
 240
 241         jtag_add_runtest(0, -1);
 242
 243 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 244 {
 245                 jtag_execute_queue();
 246
 247                 if (in)
 248                 {
 249                         DEBUG("in: 0x%8.8x", *in);
 250                 }
 251                 else
 252                 {
 253                         ERROR("BUG: called with in == NULL");
 254                 }
 255 }
 256 #endif
 257
 258         return ERROR_OK;
 259 }
 260
 261 /* clock the target, and read the databus
 262  * the *in pointer points to a buffer where elements of 'size' bytes
 263  * are stored in big (be==1) or little (be==0) endianness
 264  */
 265 int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
 266 {
 267         scan_field_t fields[2];
 268
 269         jtag_add_end_state(TAP_PD);
 270         arm_jtag_scann(jtag_info, 0x1);
 271         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 272
 273         fields[0].device = jtag_info->chain_pos;
 274         fields[0].num_bits = 1;
 275         fields[0].out_value = NULL;
 276         fields[0].out_mask = NULL;
 277         fields[0].in_value = NULL;
 278         fields[0].in_check_value = NULL;
 279         fields[0].in_check_mask = NULL;
 280         fields[0].in_handler = NULL;
 281         fields[0].in_handler_priv = NULL;
 282
 283         fields[1].device = jtag_info->chain_pos;
 284         fields[1].num_bits = 32;
 285         fields[1].out_value = NULL;
 286         fields[1].out_mask = NULL;
 287         fields[1].in_value = NULL;
 288         switch (size)
 289         {
 290                 case 4:
 291                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be32_flip : arm_jtag_buf_to_le32_flip;
 292                         break;
 293                 case 2:
 294                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be16_flip : arm_jtag_buf_to_le16_flip;
 295                         break;
 296                 case 1:
 297                         fields[1].in_handler = arm_jtag_buf_to_8_flip;
 298                         break;
 299         }
 300         fields[1].in_handler_priv = in;
 301         fields[1].in_check_value = NULL;
 302         fields[1].in_check_mask = NULL;
 303
 304         jtag_add_dr_scan(2, fields, -1, NULL);
 305
 306         jtag_add_runtest(0, -1);
 307
 308 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 309 {
 310                 jtag_execute_queue();
 311
 312                 if (in)
 313                 {
 314                         DEBUG("in: 0x%8.8x", *in);
 315                 }
 316                 else
 317                 {
 318                         ERROR("BUG: called with in == NULL");
 319                 }
 320 }
 321 #endif
 322
 323         return ERROR_OK;
 324 }
 325
 326 void arm7tdmi_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 327 {
 328         /* get pointers to arch-specific information */
 329         armv4_5_common_t *armv4_5 = target->arch_info;
 330         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 331         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 332
 333         /* save r0 before using it and put system in ARM state
 334          * to allow common handling of ARM and THUMB debugging */
 335
 336         /* fetch STR r0, [r0] */
 337         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 338         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 339         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 340         /* nothing fetched, STR r0, [r0] in Execute (2) */
 341         arm7tdmi_clock_data_in(jtag_info, r0);
 342
 343         /* MOV r0, r15 fetched, STR in Decode */
 344         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 345         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 346         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 347         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 348         /* nothing fetched, STR r0, [r0] in Execute (2) */
 349         arm7tdmi_clock_data_in(jtag_info, pc);
 350
 351         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 352         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 353         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 354         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 355         /* nothing fetched, data for LDR r0, [PC, #0] */
 356         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 357         /* nothing fetched, data from previous cycle is written to register */
 358         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 359
 360         /* fetch BX */
 361         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 362         /* NOP fetched, BX in Decode, MOV in Execute */
 363         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 364         /* NOP fetched, BX in Execute (1) */
 365         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 366
 367         jtag_execute_queue();
 368
 369         /* fix program counter:
 370          * MOV r0, r15 was the 4th instruction (+6)
 371          * reading PC in Thumb state gives address of instruction + 4
 372          */
 373         *pc -= 0xa;
 374
 375 }
 376
 377 void arm7tdmi_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 378 {
 379         int i;
 380         /* get pointers to arch-specific information */
 381         armv4_5_common_t *armv4_5 = target->arch_info;
 382         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 383         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 384
 385         /* STMIA r0-15, [r0] at debug speed
 386          * register values will start to appear on 4th DCLK
 387          */
 388         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 389
 390         /* fetch NOP, STM in DECODE stage */
 391         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 392         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 393         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 394
 395         for (i = 0; i <= 15; i++)
 396         {
 397                 if (mask & (1 << i))
 398                         /* nothing fetched, STM still in EXECUTE (1+i cycle) */
 399                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 400         }
 401
 402 }
 403
 404 void arm7tdmi_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 405 {
 406         int i;
 407         /* get pointers to arch-specific information */
 408         armv4_5_common_t *armv4_5 = target->arch_info;
 409         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 410         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 411         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 412         u32 *buf_u32 = buffer;
 413         u16 *buf_u16 = buffer;
 414         u8 *buf_u8 = buffer;
 415
 416         /* STMIA r0-15, [r0] at debug speed
 417          * register values will start to appear on 4th DCLK
 418          */
 419         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 420
 421         /* fetch NOP, STM in DECODE stage */
 422         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 423         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 424         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 425
 426         for (i = 0; i <= 15; i++)
 427         {
 428                 /* nothing fetched, STM still in EXECUTE (1+i cycle), read databus */
 429                 if (mask & (1 << i))
 430                 {
 431                         switch (size)
 432                         {
 433                                 case 4:
 434                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 435                                         break;
 436                                 case 2:
 437                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 438                                         break;
 439                                 case 1:
 440                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 441                                         break;
 442                         }
 443                 }
 444         }
 445
 446 }
 447
 448 void arm7tdmi_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 449 {
 450         /* get pointers to arch-specific information */
 451         armv4_5_common_t *armv4_5 = target->arch_info;
 452         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 453         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 454
 455         /* MRS r0, cpsr */
 456         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 457
 458         /* STR r0, [r15] */
 459         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 460         /* fetch NOP, STR in DECODE stage */
 461         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 462         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 463         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 464         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 465         arm7tdmi_clock_data_in(jtag_info, xpsr);
 466
 467 }
 468
 469 void arm7tdmi_write_xpsr(target_t *target, u32 xpsr, int spsr)
 470 {
 471         /* get pointers to arch-specific information */
 472         armv4_5_common_t *armv4_5 = target->arch_info;
 473         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 474         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 475
 476         DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 477
 478         /* MSR1 fetched */
 479         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 480         /* MSR2 fetched, MSR1 in DECODE */
 481         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 482         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 483         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 484         /* nothing fetched, MSR1 in EXECUTE (2) */
 485         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 486         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 487         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 488         /* nothing fetched, MSR2 in EXECUTE (2) */
 489         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 490         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 491         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 492         /* nothing fetched, MSR3 in EXECUTE (2) */
 493         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 494         /* NOP fetched, MSR4 in EXECUTE (1) */
 495         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 496         /* nothing fetched, MSR4 in EXECUTE (2) */
 497         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 498 }
 499
 500 void arm7tdmi_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 501 {
 502         /* get pointers to arch-specific information */
 503         armv4_5_common_t *armv4_5 = target->arch_info;
 504         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 505         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 506
 507         DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 508
 509         /* MSR fetched */
 510         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 511         /* NOP fetched, MSR in DECODE */
 512         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 513         /* NOP fetched, MSR in EXECUTE (1) */
 514         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 515         /* nothing fetched, MSR in EXECUTE (2) */
 516         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 517
 518 }
 519
 520 void arm7tdmi_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 521 {
 522         int i;
 523         /* get pointers to arch-specific information */
 524         armv4_5_common_t *armv4_5 = target->arch_info;
 525         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 526         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 527
 528         /* LDMIA r0-15, [r0] at debug speed
 529         * register values will start to appear on 4th DCLK
 530         */
 531         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 532
 533         /* fetch NOP, LDM in DECODE stage */
 534         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 535         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 536         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 537
 538         for (i = 0; i <= 15; i++)
 539         {
 540                 if (mask & (1 << i))
 541                         /* nothing fetched, LDM still in EXECUTE (1+i cycle) */
 542                         arm7tdmi_clock_out(jtag_info, core_regs[i], NULL, 0);
 543         }
 544         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 545
 546 }
 547
 548 void arm7tdmi_load_word_regs(target_t *target, u32 mask)
 549 {
 550         /* get pointers to arch-specific information */
 551         armv4_5_common_t *armv4_5 = target->arch_info;
 552         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 553         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 554
 555         /* put system-speed load-multiple into the pipeline */
 556         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 557         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 558         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 559
 560 }
 561
 562 void arm7tdmi_load_hword_reg(target_t *target, int num)
 563 {
 564         /* get pointers to arch-specific information */
 565         armv4_5_common_t *armv4_5 = target->arch_info;
 566         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 567         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 568
 569         /* put system-speed load half-word into the pipeline */
 570         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 571         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 572         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 573
 574 }
 575
 576 void arm7tdmi_load_byte_reg(target_t *target, int num)
 577 {
 578         /* get pointers to arch-specific information */
 579         armv4_5_common_t *armv4_5 = target->arch_info;
 580         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 581         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 582
 583         /* put system-speed load byte into the pipeline */
 584         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 585         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 586         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 587
 588 }
 589
 590 void arm7tdmi_store_word_regs(target_t *target, u32 mask)
 591 {
 592         /* get pointers to arch-specific information */
 593         armv4_5_common_t *armv4_5 = target->arch_info;
 594         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 595         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 596
 597         /* put system-speed store-multiple into the pipeline */
 598         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 599         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 600         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 601
 602 }
 603
 604 void arm7tdmi_store_hword_reg(target_t *target, int num)
 605 {
 606         /* get pointers to arch-specific information */
 607         armv4_5_common_t *armv4_5 = target->arch_info;
 608         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 609         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 610
 611         /* put system-speed store half-word into the pipeline */
 612         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 613         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 614         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 615
 616 }
 617
 618 void arm7tdmi_store_byte_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 store byte into the pipeline */
 626         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 627         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 628         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 629
 630 }
 631
 632 void arm7tdmi_write_pc(target_t *target, u32 pc)
 633 {
 634         /* get pointers to arch-specific information */
 635         armv4_5_common_t *armv4_5 = target->arch_info;
 636         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 637         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 638
 639         /* LDMIA r0-15, [r0] at debug speed
 640          * register values will start to appear on 4th DCLK
 641          */
 642         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 643         /* fetch NOP, LDM in DECODE stage */
 644         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 645         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 646         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 647         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 648         arm7tdmi_clock_out(jtag_info, pc, NULL, 0);
 649         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 650         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 651         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 652         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 653         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 654         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 655         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 656         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 657 }
 658
 659 void arm7tdmi_branch_resume(target_t *target)
 660 {
 661         /* get pointers to arch-specific information */
 662         armv4_5_common_t *armv4_5 = target->arch_info;
 663         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 664         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 665
 666         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 667         arm7tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffffa, 0), NULL, 0);
 668
 669 }
 670
 671 void arm7tdmi_branch_resume_thumb(target_t *target)
 672 {
 673         DEBUG("-");
 674
 675         /* get pointers to arch-specific information */
 676         armv4_5_common_t *armv4_5 = target->arch_info;
 677         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 678         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 679         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 680
 681         /* LDMIA r0, [r0] at debug speed
 682          * register values will start to appear on 4th DCLK
 683          */
 684         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 685
 686         /* fetch NOP, LDM in DECODE stage */
 687         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 688         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 689         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 690         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 691         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 692         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 693         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 694
 695         /* Branch and eXchange */
 696         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 697
 698         embeddedice_read_reg(dbg_stat);
 699
 700         /* fetch NOP, BX in DECODE stage */
 701         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 702
 703         /* target is now in Thumb state */
 704         embeddedice_read_reg(dbg_stat);
 705
 706         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 707         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 708
 709         /* target is now in Thumb state */
 710         embeddedice_read_reg(dbg_stat);
 711
 712         /* load r0 value */
 713         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 714         /* fetch NOP, LDR in Decode */
 715         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 716         /* fetch NOP, LDR in Execute */
 717         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 718         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 719         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 720         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 721         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 722
 723         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 724         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 725
 726         embeddedice_read_reg(dbg_stat);
 727
 728         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 729         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 730
 731 }
 732
 733 void arm7tdmi_build_reg_cache(target_t *target)
 734 {
 735         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 736         /* get pointers to arch-specific information */
 737         armv4_5_common_t *armv4_5 = target->arch_info;
 738         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 739         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 740
 741         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 742         armv4_5->core_cache = (*cache_p);
 743
 744         (*cache_p)->next = embeddedice_build_reg_cache(target, arm7_9);
 745         arm7_9->eice_cache = (*cache_p)->next;
 746
 747         if (arm7_9->etm_ctx)
 748         {
 749                 (*cache_p)->next->next = etm_build_reg_cache(target, jtag_info, arm7_9->etm_ctx);
 750                 arm7_9->etm_ctx->reg_cache = (*cache_p)->next->next;
 751         }
 752 }
 753
 754 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 755 {
 756
 757         arm7tdmi_build_reg_cache(target);
 758
 759         return ERROR_OK;
 760
 761 }
 762
 763 int arm7tdmi_quit()
 764 {
 765
 766         return ERROR_OK;
 767 }
 768
 769 int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int chain_pos, char *variant)
 770 {
 771         armv4_5_common_t *armv4_5;
 772         arm7_9_common_t *arm7_9;
 773
 774         arm7_9 = &arm7tdmi->arm7_9_common;
 775         armv4_5 = &arm7_9->armv4_5_common;
 776
 777         /* prepare JTAG information for the new target */
 778         arm7_9->jtag_info.chain_pos = chain_pos;
 779         arm7_9->jtag_info.scann_size = 4;
 780
 781         /* register arch-specific functions */
 782         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 783         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 784         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 785         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 786         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 787
 788         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 789         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 790         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 791
 792         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 793         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 794         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 795
 796         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 797         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 798         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 799
 800         arm7_9->write_pc = arm7tdmi_write_pc;
 801         arm7_9->branch_resume = arm7tdmi_branch_resume;
 802         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 803
 804         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 805         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 806
 807         arm7_9->pre_debug_entry = NULL;
 808         arm7_9->post_debug_entry = NULL;
 809
 810         arm7_9->pre_restore_context = NULL;
 811         arm7_9->post_restore_context = NULL;
 812
 813         /* initialize arch-specific breakpoint handling */
 814         arm7_9->arm_bkpt = 0xdeeedeee;
 815         arm7_9->thumb_bkpt = 0xdeee;
 816
 817         arm7_9->sw_bkpts_use_wp = 1;
 818         arm7_9->sw_bkpts_enabled = 0;
 819         arm7_9->dbgreq_adjust_pc = 2;
 820         arm7_9->arch_info = arm7tdmi;
 821
 822         arm7tdmi->arch_info = NULL;
 823         arm7tdmi->common_magic = ARM7TDMI_COMMON_MAGIC;
 824
 825         if (variant)
 826         {
 827                 arm7tdmi->variant = strdup(variant);
 828         }
 829         else
 830         {
 831                 arm7tdmi->variant = strdup("");
 832         }
 833
 834         arm7_9_init_arch_info(target, arm7_9);
 835
 836         return ERROR_OK;
 837 }
 838
 839 /* target arm7tdmi <endianess> <startup_mode> <chain_pos> <variant> */
 840 int arm7tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 841 {
 842         int chain_pos;
 843         char *variant = NULL;
 844         arm7tdmi_common_t *arm7tdmi = malloc(sizeof(arm7tdmi_common_t));
 845
 846         if (argc < 4)
 847         {
 848                 ERROR("'target arm7tdmi' requires at least one additional argument");
 849                 exit(-1);
 850         }
 851
 852         chain_pos = strtoul(args[3], NULL, 0);
 853
 854         if (argc >= 5)
 855                 variant = args[4];
 856
 857         arm7tdmi_init_arch_info(target, arm7tdmi, chain_pos, variant);
 858
 859         return ERROR_OK;
 860 }
 861
 862 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx)
 863 {
 864         int retval;
 865
 866         retval = arm7_9_register_commands(cmd_ctx);
 867
 868         return ERROR_OK;
 869
 870 }
 871