src/target/arm7tdmi.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   9  *   oyvind.harboe@zylin.com                                               *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "arm7tdmi.h"
  31 #include "target_type.h"
  32
  33
  34 #if 0
  35 #define _DEBUG_INSTRUCTION_EXECUTION_
  36 #endif
  37
  38 /* forward declarations */
  39
  40 int arm7tdmi_target_create(struct target_s *target,Jim_Interp *interp);
  41
  42 /* target function declarations */
  43 int arm7tdmi_poll(struct target_s *target);
  44 int arm7tdmi_halt(target_t *target);
  45
  46 target_type_t arm7tdmi_target =
  47 {
  48         .name = "arm7tdmi",
  49
  50         .poll = arm7_9_poll,
  51         .arch_state = armv4_5_arch_state,
  52
  53         .target_request_data = arm7_9_target_request_data,
  54
  55         .halt = arm7_9_halt,
  56         .resume = arm7_9_resume,
  57         .step = arm7_9_step,
  58
  59         .assert_reset = arm7_9_assert_reset,
  60         .deassert_reset = arm7_9_deassert_reset,
  61         .soft_reset_halt = arm7_9_soft_reset_halt,
  62
  63         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  64
  65         .read_memory = arm7_9_read_memory,
  66         .write_memory = arm7_9_write_memory,
  67         .bulk_write_memory = arm7_9_bulk_write_memory,
  68         .checksum_memory = arm7_9_checksum_memory,
  69         .blank_check_memory = arm7_9_blank_check_memory,
  70
  71         .run_algorithm = armv4_5_run_algorithm,
  72
  73         .add_breakpoint = arm7_9_add_breakpoint,
  74         .remove_breakpoint = arm7_9_remove_breakpoint,
  75         .add_watchpoint = arm7_9_add_watchpoint,
  76         .remove_watchpoint = arm7_9_remove_watchpoint,
  77
  78         .register_commands  = arm7tdmi_register_commands,
  79         .target_create  = arm7tdmi_target_create,
  80         .init_target = arm7tdmi_init_target,
  81         .examine = arm7tdmi_examine,
  82 };
  83
  84 int arm7tdmi_examine_debug_reason(target_t *target)
  85 {
  86         int retval = ERROR_OK;
  87         /* get pointers to arch-specific information */
  88         armv4_5_common_t *armv4_5 = target->arch_info;
  89         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  90
  91         /* only check the debug reason if we don't know it already */
  92         if ((target->debug_reason != DBG_REASON_DBGRQ)
  93                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
  94         {
  95                 scan_field_t fields[2];
  96                 uint8_t databus[4];
  97                 uint8_t breakpoint;
  98
  99                 jtag_set_end_state(TAP_DRPAUSE);
 100
 101                 fields[0].tap = arm7_9->jtag_info.tap;
 102                 fields[0].num_bits = 1;
 103                 fields[0].out_value = NULL;
 104                 fields[0].in_value = &breakpoint;
 105
 106                 fields[1].tap = arm7_9->jtag_info.tap;
 107                 fields[1].num_bits = 32;
 108                 fields[1].out_value = NULL;
 109                 fields[1].in_value = databus;
 110
 111                 if ((retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1)) != ERROR_OK)
 112                 {
 113                         return retval;
 114                 }
 115                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
 116
 117                 jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
 118                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 119                 {
 120                         return retval;
 121                 }
 122
 123                 fields[0].in_value = NULL;
 124                 fields[0].out_value = &breakpoint;
 125                 fields[1].in_value = NULL;
 126                 fields[1].out_value = databus;
 127
 128                 jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
 129
 130                 if (breakpoint & 1)
 131                         target->debug_reason = DBG_REASON_WATCHPOINT;
 132                 else
 133                         target->debug_reason = DBG_REASON_BREAKPOINT;
 134         }
 135
 136         return ERROR_OK;
 137 }
 138
 139 static int arm7tdmi_num_bits[]={1, 32};
 140 static __inline int arm7tdmi_clock_out_inner(arm_jtag_t *jtag_info, uint32_t out, int breakpoint)
 141 {
 142         uint32_t values[2]={breakpoint, flip_u32(out, 32)};
 143
 144         jtag_add_dr_out(jtag_info->tap,
 145                         2,
 146                         arm7tdmi_num_bits,
 147                         values,
 148                         jtag_get_end_state());
 149
 150         jtag_add_runtest(0, jtag_get_end_state());
 151
 152         return ERROR_OK;
 153 }
 154
 155 /* put an instruction in the ARM7TDMI pipeline or write the data bus, and optionally read data */
 156 static __inline int arm7tdmi_clock_out(arm_jtag_t *jtag_info, uint32_t out, uint32_t *deprecated, int breakpoint)
 157 {
 158         jtag_set_end_state(TAP_DRPAUSE);
 159         arm_jtag_scann(jtag_info, 0x1);
 160         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 161
 162         return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
 163 }
 164
 165 /* clock the target, reading the databus */
 166 int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, uint32_t *in)
 167 {
 168         int retval = ERROR_OK;
 169         scan_field_t fields[2];
 170
 171         jtag_set_end_state(TAP_DRPAUSE);
 172         if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
 173         {
 174                 return retval;
 175         }
 176         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 177
 178         fields[0].tap = jtag_info->tap;
 179         fields[0].num_bits = 1;
 180         fields[0].out_value = NULL;
 181         fields[0].in_value = NULL;
 182
 183         fields[1].tap = jtag_info->tap;
 184         fields[1].num_bits = 32;
 185         fields[1].out_value = NULL;
 186         fields[1].in_value = (uint8_t *)in;
 187
 188         jtag_add_dr_scan(2, fields, jtag_get_end_state());
 189
 190         jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
 191
 192         jtag_add_runtest(0, jtag_get_end_state());
 193
 194 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 195 {
 196                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 197                 {
 198                         return retval;
 199                 }
 200
 201                 if (in)
 202                 {
 203                         LOG_DEBUG("in: 0x%8.8x", *in);
 204                 }
 205                 else
 206                 {
 207                         LOG_ERROR("BUG: called with in == NULL");
 208                 }
 209 }
 210 #endif
 211
 212         return ERROR_OK;
 213 }
 214
 215 void arm_endianness(uint8_t *tmp, void *in, int size, int be, int flip)
 216 {
 217         uint32_t readback = le_to_h_u32(tmp);
 218         if (flip)
 219                 readback = flip_u32(readback, 32);
 220         switch (size)
 221         {
 222                 case 4:
 223                         if (be)
 224                         {
 225                                 h_u32_to_be(((uint8_t*)in), readback);
 226                         } else
 227                         {
 228                                  h_u32_to_le(((uint8_t*)in), readback);
 229                         }
 230                         break;
 231                 case 2:
 232                         if (be)
 233                         {
 234                                 h_u16_to_be(((uint8_t*)in), readback & 0xffff);
 235                         } else
 236                         {
 237                                 h_u16_to_le(((uint8_t*)in), readback & 0xffff);
 238                         }
 239                         break;
 240                 case 1:
 241                         *((uint8_t *)in)= readback & 0xff;
 242                         break;
 243         }
 244 }
 245
 246 static int arm7endianness(jtag_callback_data_t arg, jtag_callback_data_t size, jtag_callback_data_t be, jtag_callback_data_t captured)
 247 {
 248   uint8_t *in = (uint8_t *)arg;
 249         arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1);
 250         return ERROR_OK;
 251 }
 252
 253 /* clock the target, and read the databus
 254  * the *in pointer points to a buffer where elements of 'size' bytes
 255  * are stored in big (be == 1) or little (be == 0) endianness
 256  */
 257 int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
 258 {
 259         int retval = ERROR_OK;
 260         scan_field_t fields[2];
 261
 262         jtag_set_end_state(TAP_DRPAUSE);
 263         if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
 264         {
 265                 return retval;
 266         }
 267         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 268
 269         fields[0].tap = jtag_info->tap;
 270         fields[0].num_bits = 1;
 271         fields[0].out_value = NULL;
 272         fields[0].in_value = NULL;
 273
 274         fields[1].tap = jtag_info->tap;
 275         fields[1].num_bits = 32;
 276         fields[1].out_value = NULL;
 277         jtag_alloc_in_value32(&fields[1]);
 278
 279         jtag_add_dr_scan(2, fields, jtag_get_end_state());
 280
 281         jtag_add_callback4(arm7endianness, (jtag_callback_data_t)in, (jtag_callback_data_t)size, (jtag_callback_data_t)be, (jtag_callback_data_t)fields[1].in_value);
 282
 283         jtag_add_runtest(0, jtag_get_end_state());
 284
 285 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 286 {
 287                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 288                 {
 289                         return retval;
 290                 }
 291
 292                 if (in)
 293                 {
 294                         LOG_DEBUG("in: 0x%8.8x", *(uint32_t*)in);
 295                 }
 296                 else
 297                 {
 298                         LOG_ERROR("BUG: called with in == NULL");
 299                 }
 300 }
 301 #endif
 302
 303         return ERROR_OK;
 304 }
 305
 306 void arm7tdmi_change_to_arm(target_t *target, uint32_t *r0, uint32_t *pc)
 307 {
 308         /* get pointers to arch-specific information */
 309         armv4_5_common_t *armv4_5 = target->arch_info;
 310         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 311         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 312
 313         /* save r0 before using it and put system in ARM state
 314          * to allow common handling of ARM and THUMB debugging */
 315
 316         /* fetch STR r0, [r0] */
 317         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 318         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 319         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 320         /* nothing fetched, STR r0, [r0] in Execute (2) */
 321         arm7tdmi_clock_data_in(jtag_info, r0);
 322
 323         /* MOV r0, r15 fetched, STR in Decode */
 324         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 325         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 326         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 327         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 328         /* nothing fetched, STR r0, [r0] in Execute (2) */
 329         arm7tdmi_clock_data_in(jtag_info, pc);
 330
 331         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 332         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 333         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 334         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 335         /* nothing fetched, data for LDR r0, [PC, #0] */
 336         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 337         /* nothing fetched, data from previous cycle is written to register */
 338         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 339
 340         /* fetch BX */
 341         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 342         /* NOP fetched, BX in Decode, MOV in Execute */
 343         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 344         /* NOP fetched, BX in Execute (1) */
 345         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 346
 347         jtag_execute_queue();
 348
 349         /* fix program counter:
 350          * MOV r0, r15 was the 4th instruction (+6)
 351          * reading PC in Thumb state gives address of instruction + 4
 352          */
 353         *pc -= 0xa;
 354 }
 355
 356
 357 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
 358  * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
 359  *
 360  * The solution is to arrange for a large out/in scan in this loop and
 361  * and convert data afterwards.
 362  */
 363 void arm7tdmi_read_core_regs(target_t *target, uint32_t mask, uint32_t* core_regs[16])
 364 {
 365         int i;
 366         /* get pointers to arch-specific information */
 367         armv4_5_common_t *armv4_5 = target->arch_info;
 368         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 369         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 370
 371         /* STMIA r0-15, [r0] at debug speed
 372          * register values will start to appear on 4th DCLK
 373          */
 374         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 375
 376         /* fetch NOP, STM in DECODE stage */
 377         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 378         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 379         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 380
 381         for (i = 0; i <= 15; i++)
 382         {
 383                 if (mask & (1 << i))
 384                         /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
 385                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 386         }
 387 }
 388
 389 void arm7tdmi_read_core_regs_target_buffer(target_t *target, uint32_t mask, void* buffer, int size)
 390 {
 391         int i;
 392         /* get pointers to arch-specific information */
 393         armv4_5_common_t *armv4_5 = target->arch_info;
 394         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 395         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 396         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 397         uint32_t *buf_u32 = buffer;
 398         uint16_t *buf_u16 = buffer;
 399         uint8_t *buf_u8 = buffer;
 400
 401         /* STMIA r0-15, [r0] at debug speed
 402          * register values will start to appear on 4th DCLK
 403          */
 404         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 405
 406         /* fetch NOP, STM in DECODE stage */
 407         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 408         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 409         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 410
 411         for (i = 0; i <= 15; i++)
 412         {
 413                 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
 414                 if (mask & (1 << i))
 415                 {
 416                         switch (size)
 417                         {
 418                                 case 4:
 419                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 420                                         break;
 421                                 case 2:
 422                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 423                                         break;
 424                                 case 1:
 425                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 426                                         break;
 427                         }
 428                 }
 429         }
 430 }
 431
 432 void arm7tdmi_read_xpsr(target_t *target, uint32_t *xpsr, int spsr)
 433 {
 434         /* get pointers to arch-specific information */
 435         armv4_5_common_t *armv4_5 = target->arch_info;
 436         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 437         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 438
 439         /* MRS r0, cpsr */
 440         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 441
 442         /* STR r0, [r15] */
 443         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 444         /* fetch NOP, STR in DECODE stage */
 445         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 446         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 447         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 448         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 449         arm7tdmi_clock_data_in(jtag_info, xpsr);
 450 }
 451
 452 void arm7tdmi_write_xpsr(target_t *target, uint32_t xpsr, int spsr)
 453 {
 454         /* get pointers to arch-specific information */
 455         armv4_5_common_t *armv4_5 = target->arch_info;
 456         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 457         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 458
 459         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 460
 461         /* MSR1 fetched */
 462         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 463         /* MSR2 fetched, MSR1 in DECODE */
 464         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 465         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 466         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 467         /* nothing fetched, MSR1 in EXECUTE (2) */
 468         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 469         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 470         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 471         /* nothing fetched, MSR2 in EXECUTE (2) */
 472         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 473         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 474         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 475         /* nothing fetched, MSR3 in EXECUTE (2) */
 476         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 477         /* NOP fetched, MSR4 in EXECUTE (1) */
 478         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 479         /* nothing fetched, MSR4 in EXECUTE (2) */
 480         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 481 }
 482
 483 void arm7tdmi_write_xpsr_im8(target_t *target, uint8_t xpsr_im, int rot, int spsr)
 484 {
 485         /* get pointers to arch-specific information */
 486         armv4_5_common_t *armv4_5 = target->arch_info;
 487         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 488         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 489
 490         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 491
 492         /* MSR fetched */
 493         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 494         /* NOP fetched, MSR in DECODE */
 495         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 496         /* NOP fetched, MSR in EXECUTE (1) */
 497         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 498         /* nothing fetched, MSR in EXECUTE (2) */
 499         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 500 }
 501
 502 void arm7tdmi_write_core_regs(target_t *target, uint32_t mask, uint32_t core_regs[16])
 503 {
 504         int i;
 505         /* get pointers to arch-specific information */
 506         armv4_5_common_t *armv4_5 = target->arch_info;
 507         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 508         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 509
 510         /* LDMIA r0-15, [r0] at debug speed
 511         * register values will start to appear on 4th DCLK
 512         */
 513         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 514
 515         /* fetch NOP, LDM in DECODE stage */
 516         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 517         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 518         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 519
 520         for (i = 0; i <= 15; i++)
 521         {
 522                 if (mask & (1 << i))
 523                         /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
 524                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 525         }
 526         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 527 }
 528
 529 void arm7tdmi_load_word_regs(target_t *target, uint32_t mask)
 530 {
 531         /* get pointers to arch-specific information */
 532         armv4_5_common_t *armv4_5 = target->arch_info;
 533         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 534         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 535
 536         /* put system-speed load-multiple into the pipeline */
 537         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 539         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 540 }
 541
 542 void arm7tdmi_load_hword_reg(target_t *target, int num)
 543 {
 544         /* get pointers to arch-specific information */
 545         armv4_5_common_t *armv4_5 = target->arch_info;
 546         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 547         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 548
 549         /* put system-speed load half-word into the pipeline */
 550         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 551         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 552         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 553 }
 554
 555 void arm7tdmi_load_byte_reg(target_t *target, int num)
 556 {
 557         /* get pointers to arch-specific information */
 558         armv4_5_common_t *armv4_5 = target->arch_info;
 559         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 560         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 561
 562         /* put system-speed load byte into the pipeline */
 563         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 564         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 565         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 566 }
 567
 568 void arm7tdmi_store_word_regs(target_t *target, uint32_t mask)
 569 {
 570         /* get pointers to arch-specific information */
 571         armv4_5_common_t *armv4_5 = target->arch_info;
 572         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 573         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 574
 575         /* put system-speed store-multiple into the pipeline */
 576         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 577         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 578         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 579 }
 580
 581 void arm7tdmi_store_hword_reg(target_t *target, int num)
 582 {
 583         /* get pointers to arch-specific information */
 584         armv4_5_common_t *armv4_5 = target->arch_info;
 585         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 586         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 587
 588         /* put system-speed store half-word into the pipeline */
 589         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 590         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 591         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 592 }
 593
 594 void arm7tdmi_store_byte_reg(target_t *target, int num)
 595 {
 596         /* get pointers to arch-specific information */
 597         armv4_5_common_t *armv4_5 = target->arch_info;
 598         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 599         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 600
 601         /* put system-speed store byte into the pipeline */
 602         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 603         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 604         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 605 }
 606
 607 void arm7tdmi_write_pc(target_t *target, uint32_t pc)
 608 {
 609         /* get pointers to arch-specific information */
 610         armv4_5_common_t *armv4_5 = target->arch_info;
 611         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 612         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 613
 614         /* LDMIA r0-15, [r0] at debug speed
 615          * register values will start to appear on 4th DCLK
 616          */
 617         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 618         /* fetch NOP, LDM in DECODE stage */
 619         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 620         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 621         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 622         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 623         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 624         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 625         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 626         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 627         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 628         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 629         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 630         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 631         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 632 }
 633
 634 void arm7tdmi_branch_resume(target_t *target)
 635 {
 636         /* get pointers to arch-specific information */
 637         armv4_5_common_t *armv4_5 = target->arch_info;
 638         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 639         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 640
 641         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 642         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 643 }
 644
 645 void arm7tdmi_branch_resume_thumb(target_t *target)
 646 {
 647         LOG_DEBUG("-");
 648
 649         /* get pointers to arch-specific information */
 650         armv4_5_common_t *armv4_5 = target->arch_info;
 651         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 652         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 653         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 654
 655         /* LDMIA r0, [r0] at debug speed
 656          * register values will start to appear on 4th DCLK
 657          */
 658         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 659
 660         /* fetch NOP, LDM in DECODE stage */
 661         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 662         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 663         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 664         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 665         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 666         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 667         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 668
 669         /* Branch and eXchange */
 670         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 671
 672         embeddedice_read_reg(dbg_stat);
 673
 674         /* fetch NOP, BX in DECODE stage */
 675         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 676
 677         /* target is now in Thumb state */
 678         embeddedice_read_reg(dbg_stat);
 679
 680         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 681         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 682
 683         /* target is now in Thumb state */
 684         embeddedice_read_reg(dbg_stat);
 685
 686         /* load r0 value */
 687         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 688         /* fetch NOP, LDR in Decode */
 689         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 690         /* fetch NOP, LDR in Execute */
 691         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 692         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 693         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 694         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 695         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 696
 697         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 698         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 699
 700         embeddedice_read_reg(dbg_stat);
 701
 702         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 703         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 704 }
 705
 706 void arm7tdmi_build_reg_cache(target_t *target)
 707 {
 708         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 709         /* get pointers to arch-specific information */
 710         armv4_5_common_t *armv4_5 = target->arch_info;
 711
 712         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 713         armv4_5->core_cache = (*cache_p);
 714 }
 715
 716 int arm7tdmi_examine(struct target_s *target)
 717 {
 718         int retval;
 719         armv4_5_common_t *armv4_5 = target->arch_info;
 720         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 721         if (!target_was_examined(target))
 722         {
 723                 /* get pointers to arch-specific information */
 724                 reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 725                 reg_cache_t *t = embeddedice_build_reg_cache(target, arm7_9);
 726                 if (t == NULL)
 727                         return ERROR_FAIL;
 728
 729                 (*cache_p) = t;
 730                 arm7_9->eice_cache = (*cache_p);
 731
 732                 if (arm7_9->etm_ctx)
 733                 {
 734                         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 735                         (*cache_p)->next = etm_build_reg_cache(target, jtag_info, arm7_9->etm_ctx);
 736                         arm7_9->etm_ctx->reg_cache = (*cache_p)->next;
 737                 }
 738                 target_set_examined(target);
 739         }
 740         if ((retval = embeddedice_setup(target)) != ERROR_OK)
 741                 return retval;
 742         if ((retval = arm7_9_setup(target)) != ERROR_OK)
 743                 return retval;
 744         if (arm7_9->etm_ctx)
 745         {
 746                 if ((retval = etm_setup(target)) != ERROR_OK)
 747                         return retval;
 748         }
 749         return ERROR_OK;
 750 }
 751
 752 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 753 {
 754         arm7tdmi_build_reg_cache(target);
 755
 756         return ERROR_OK;
 757 }
 758
 759 int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, jtag_tap_t *tap)
 760 {
 761         armv4_5_common_t *armv4_5;
 762         arm7_9_common_t *arm7_9;
 763
 764         arm7_9 = &arm7tdmi->arm7_9_common;
 765         armv4_5 = &arm7_9->armv4_5_common;
 766
 767         /* prepare JTAG information for the new target */
 768         arm7_9->jtag_info.tap = tap;
 769         arm7_9->jtag_info.scann_size = 4;
 770
 771         /* register arch-specific functions */
 772         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 773         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 774         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 775         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 776         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 777
 778         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 779         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 780         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 781
 782         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 783         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 784         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 785
 786         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 787         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 788         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 789
 790         arm7_9->write_pc = arm7tdmi_write_pc;
 791         arm7_9->branch_resume = arm7tdmi_branch_resume;
 792         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 793
 794         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 795         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 796
 797         arm7_9->post_debug_entry = NULL;
 798
 799         arm7_9->pre_restore_context = NULL;
 800         arm7_9->post_restore_context = NULL;
 801
 802         /* initialize arch-specific breakpoint handling */
 803         arm7_9->arm_bkpt = 0xdeeedeee;
 804         arm7_9->thumb_bkpt = 0xdeee;
 805
 806         arm7_9->dbgreq_adjust_pc = 2;
 807         arm7_9->arch_info = arm7tdmi;
 808
 809         arm7tdmi->arch_info = NULL;
 810         arm7tdmi->common_magic = ARM7TDMI_COMMON_MAGIC;
 811
 812         arm7_9_init_arch_info(target, arm7_9);
 813
 814         return ERROR_OK;
 815 }
 816
 817 int arm7tdmi_target_create(struct target_s *target, Jim_Interp *interp)
 818 {
 819         arm7tdmi_common_t *arm7tdmi;
 820
 821         arm7tdmi = calloc(1,sizeof(arm7tdmi_common_t));
 822         arm7tdmi_init_arch_info(target, arm7tdmi, target->tap);
 823         arm7tdmi->arm7_9_common.armv4_5_common.is_armv4 = true;
 824
 825         return ERROR_OK;
 826 }
 827
 828 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx)
 829 {
 830         int retval;
 831
 832         retval = arm7_9_register_commands(cmd_ctx);
 833
 834         return retval;
 835 }