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         .target_request_data = arm7_9_target_request_data,
  63
  64         .halt = arm7_9_halt,
  65         .resume = arm7_9_resume,
  66         .step = arm7_9_step,
  67
  68         .assert_reset = arm7_9_assert_reset,
  69         .deassert_reset = arm7_9_deassert_reset,
  70         .soft_reset_halt = arm7_9_soft_reset_halt,
  71         .prepare_reset_halt = arm7_9_prepare_reset_halt,
  72
  73         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  74
  75         .read_memory = arm7_9_read_memory,
  76         .write_memory = arm7_9_write_memory,
  77         .bulk_write_memory = arm7_9_bulk_write_memory,
  78
  79         .run_algorithm = armv4_5_run_algorithm,
  80
  81         .add_breakpoint = arm7_9_add_breakpoint,
  82         .remove_breakpoint = arm7_9_remove_breakpoint,
  83         .add_watchpoint = arm7_9_add_watchpoint,
  84         .remove_watchpoint = arm7_9_remove_watchpoint,
  85
  86         .register_commands = arm7tdmi_register_commands,
  87         .target_command = arm7tdmi_target_command,
  88         .init_target = arm7tdmi_init_target,
  89         .quit = arm7tdmi_quit
  90 };
  91
  92 int arm7tdmi_examine_debug_reason(target_t *target)
  93 {
  94         /* get pointers to arch-specific information */
  95         armv4_5_common_t *armv4_5 = target->arch_info;
  96         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  97
  98         /* only check the debug reason if we don't know it already */
  99         if ((target->debug_reason != DBG_REASON_DBGRQ)
 100                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
 101         {
 102                 scan_field_t fields[2];
 103                 u8 databus[4];
 104                 u8 breakpoint;
 105
 106                 jtag_add_end_state(TAP_PD);
 107
 108                 fields[0].device = arm7_9->jtag_info.chain_pos;
 109                 fields[0].num_bits = 1;
 110                 fields[0].out_value = NULL;
 111                 fields[0].out_mask = NULL;
 112                 fields[0].in_value = &breakpoint;
 113                 fields[0].in_check_value = NULL;
 114                 fields[0].in_check_mask = NULL;
 115                 fields[0].in_handler = NULL;
 116                 fields[0].in_handler_priv = NULL;
 117
 118                 fields[1].device = arm7_9->jtag_info.chain_pos;
 119                 fields[1].num_bits = 32;
 120                 fields[1].out_value = NULL;
 121                 fields[1].out_mask = NULL;
 122                 fields[1].in_value = databus;
 123                 fields[1].in_check_value = NULL;
 124                 fields[1].in_check_mask = NULL;
 125                 fields[1].in_handler = NULL;
 126                 fields[1].in_handler_priv = NULL;
 127
 128                 arm_jtag_scann(&arm7_9->jtag_info, 0x1);
 129                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
 130
 131                 jtag_add_dr_scan(2, fields, TAP_PD, NULL);
 132                 jtag_execute_queue();
 133
 134                 fields[0].in_value = NULL;
 135                 fields[0].out_value = &breakpoint;
 136                 fields[1].in_value = NULL;
 137                 fields[1].out_value = databus;
 138
 139                 jtag_add_dr_scan(2, fields, TAP_PD, NULL);
 140
 141                 if (breakpoint & 1)
 142                         target->debug_reason = DBG_REASON_WATCHPOINT;
 143                 else
 144                         target->debug_reason = DBG_REASON_BREAKPOINT;
 145         }
 146
 147         return ERROR_OK;
 148 }
 149
 150 /* put an instruction in the ARM7TDMI pipeline or write the data bus, and optionally read data */
 151 int arm7tdmi_clock_out(arm_jtag_t *jtag_info, u32 out, u32 *in, int breakpoint)
 152 {
 153         scan_field_t fields[2];
 154         u8 out_buf[4];
 155         u8 breakpoint_buf;
 156
 157         buf_set_u32(out_buf, 0, 32, flip_u32(out, 32));
 158         buf_set_u32(&breakpoint_buf, 0, 1, breakpoint);
 159
 160         jtag_add_end_state(TAP_PD);
 161         arm_jtag_scann(jtag_info, 0x1);
 162         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 163
 164         fields[0].device = jtag_info->chain_pos;
 165         fields[0].num_bits = 1;
 166         fields[0].out_value = &breakpoint_buf;
 167         fields[0].out_mask = NULL;
 168         fields[0].in_value = NULL;
 169         fields[0].in_check_value = NULL;
 170         fields[0].in_check_mask = NULL;
 171         fields[0].in_handler = NULL;
 172         fields[0].in_handler_priv = NULL;
 173
 174         fields[1].device = jtag_info->chain_pos;
 175         fields[1].num_bits = 32;
 176         fields[1].out_value = out_buf;
 177         fields[1].out_mask = NULL;
 178         fields[1].in_value = NULL;
 179         if (in)
 180         {
 181                 fields[1].in_handler = arm_jtag_buf_to_u32_flip;
 182                 fields[1].in_handler_priv = in;
 183         }
 184         else
 185         {
 186                 fields[1].in_handler = NULL;
 187                 fields[1].in_handler_priv = NULL;
 188         }
 189         fields[1].in_check_value = NULL;
 190         fields[1].in_check_mask = NULL;
 191
 192         jtag_add_dr_scan(2, fields, -1, NULL);
 193
 194         jtag_add_runtest(0, -1);
 195
 196 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 197 {
 198                 jtag_execute_queue();
 199
 200                 if (in)
 201                 {
 202                         DEBUG("out: 0x%8.8x, in: 0x%8.8x", out, *in);
 203                 }
 204                 else
 205                         DEBUG("out: 0x%8.8x", out);
 206 }
 207 #endif
 208
 209         return ERROR_OK;
 210 }
 211
 212 /* clock the target, reading the databus */
 213 int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 214 {
 215         scan_field_t fields[2];
 216
 217         jtag_add_end_state(TAP_PD);
 218         arm_jtag_scann(jtag_info, 0x1);
 219         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 220
 221         fields[0].device = jtag_info->chain_pos;
 222         fields[0].num_bits = 1;
 223         fields[0].out_value = NULL;
 224         fields[0].out_mask = NULL;
 225         fields[0].in_value = NULL;
 226         fields[0].in_check_value = NULL;
 227         fields[0].in_check_mask = NULL;
 228         fields[0].in_handler = NULL;
 229         fields[0].in_handler_priv = NULL;
 230
 231         fields[1].device = jtag_info->chain_pos;
 232         fields[1].num_bits = 32;
 233         fields[1].out_value = NULL;
 234         fields[1].out_mask = NULL;
 235         fields[1].in_value = NULL;
 236         fields[1].in_handler = arm_jtag_buf_to_u32_flip;
 237         fields[1].in_handler_priv = in;
 238         fields[1].in_check_value = NULL;
 239         fields[1].in_check_mask = NULL;
 240
 241         jtag_add_dr_scan(2, fields, -1, NULL);
 242
 243         jtag_add_runtest(0, -1);
 244
 245 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 246 {
 247                 jtag_execute_queue();
 248
 249                 if (in)
 250                 {
 251                         DEBUG("in: 0x%8.8x", *in);
 252                 }
 253                 else
 254                 {
 255                         ERROR("BUG: called with in == NULL");
 256                 }
 257 }
 258 #endif
 259
 260         return ERROR_OK;
 261 }
 262
 263 /* clock the target, and read the databus
 264  * the *in pointer points to a buffer where elements of 'size' bytes
 265  * are stored in big (be==1) or little (be==0) endianness
 266  */
 267 int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
 268 {
 269         scan_field_t fields[2];
 270
 271         jtag_add_end_state(TAP_PD);
 272         arm_jtag_scann(jtag_info, 0x1);
 273         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 274
 275         fields[0].device = jtag_info->chain_pos;
 276         fields[0].num_bits = 1;
 277         fields[0].out_value = NULL;
 278         fields[0].out_mask = NULL;
 279         fields[0].in_value = NULL;
 280         fields[0].in_check_value = NULL;
 281         fields[0].in_check_mask = NULL;
 282         fields[0].in_handler = NULL;
 283         fields[0].in_handler_priv = NULL;
 284
 285         fields[1].device = jtag_info->chain_pos;
 286         fields[1].num_bits = 32;
 287         fields[1].out_value = NULL;
 288         fields[1].out_mask = NULL;
 289         fields[1].in_value = NULL;
 290         switch (size)
 291         {
 292                 case 4:
 293                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be32_flip : arm_jtag_buf_to_le32_flip;
 294                         break;
 295                 case 2:
 296                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be16_flip : arm_jtag_buf_to_le16_flip;
 297                         break;
 298                 case 1:
 299                         fields[1].in_handler = arm_jtag_buf_to_8_flip;
 300                         break;
 301         }
 302         fields[1].in_handler_priv = in;
 303         fields[1].in_check_value = NULL;
 304         fields[1].in_check_mask = NULL;
 305
 306         jtag_add_dr_scan(2, fields, -1, NULL);
 307
 308         jtag_add_runtest(0, -1);
 309
 310 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 311 {
 312                 jtag_execute_queue();
 313
 314                 if (in)
 315                 {
 316                         DEBUG("in: 0x%8.8x", *in);
 317                 }
 318                 else
 319                 {
 320                         ERROR("BUG: called with in == NULL");
 321                 }
 322 }
 323 #endif
 324
 325         return ERROR_OK;
 326 }
 327
 328 void arm7tdmi_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 329 {
 330         /* get pointers to arch-specific information */
 331         armv4_5_common_t *armv4_5 = target->arch_info;
 332         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 333         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 334
 335         /* save r0 before using it and put system in ARM state
 336          * to allow common handling of ARM and THUMB debugging */
 337
 338         /* fetch STR r0, [r0] */
 339         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 340         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 341         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 342         /* nothing fetched, STR r0, [r0] in Execute (2) */
 343         arm7tdmi_clock_data_in(jtag_info, r0);
 344
 345         /* MOV r0, r15 fetched, STR in Decode */
 346         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 347         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 348         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 349         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 350         /* nothing fetched, STR r0, [r0] in Execute (2) */
 351         arm7tdmi_clock_data_in(jtag_info, pc);
 352
 353         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 354         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 355         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 356         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 357         /* nothing fetched, data for LDR r0, [PC, #0] */
 358         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 359         /* nothing fetched, data from previous cycle is written to register */
 360         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 361
 362         /* fetch BX */
 363         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 364         /* NOP fetched, BX in Decode, MOV in Execute */
 365         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 366         /* NOP fetched, BX in Execute (1) */
 367         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 368
 369         jtag_execute_queue();
 370
 371         /* fix program counter:
 372          * MOV r0, r15 was the 4th instruction (+6)
 373          * reading PC in Thumb state gives address of instruction + 4
 374          */
 375         *pc -= 0xa;
 376
 377 }
 378
 379 void arm7tdmi_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 380 {
 381         int i;
 382         /* get pointers to arch-specific information */
 383         armv4_5_common_t *armv4_5 = target->arch_info;
 384         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 385         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 386
 387         /* STMIA r0-15, [r0] at debug speed
 388          * register values will start to appear on 4th DCLK
 389          */
 390         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 391
 392         /* fetch NOP, STM in DECODE stage */
 393         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 394         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 395         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 396
 397         for (i = 0; i <= 15; i++)
 398         {
 399                 if (mask & (1 << i))
 400                         /* nothing fetched, STM still in EXECUTE (1+i cycle) */
 401                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 402         }
 403
 404 }
 405
 406 void arm7tdmi_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 407 {
 408         int i;
 409         /* get pointers to arch-specific information */
 410         armv4_5_common_t *armv4_5 = target->arch_info;
 411         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 412         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 413         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 414         u32 *buf_u32 = buffer;
 415         u16 *buf_u16 = buffer;
 416         u8 *buf_u8 = buffer;
 417
 418         /* STMIA r0-15, [r0] at debug speed
 419          * register values will start to appear on 4th DCLK
 420          */
 421         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 422
 423         /* fetch NOP, STM in DECODE stage */
 424         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 425         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 426         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 427
 428         for (i = 0; i <= 15; i++)
 429         {
 430                 /* nothing fetched, STM still in EXECUTE (1+i cycle), read databus */
 431                 if (mask & (1 << i))
 432                 {
 433                         switch (size)
 434                         {
 435                                 case 4:
 436                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 437                                         break;
 438                                 case 2:
 439                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 440                                         break;
 441                                 case 1:
 442                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 443                                         break;
 444                         }
 445                 }
 446         }
 447
 448 }
 449
 450 void arm7tdmi_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 451 {
 452         /* get pointers to arch-specific information */
 453         armv4_5_common_t *armv4_5 = target->arch_info;
 454         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 455         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 456
 457         /* MRS r0, cpsr */
 458         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 459
 460         /* STR r0, [r15] */
 461         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 462         /* fetch NOP, STR in DECODE stage */
 463         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 464         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 465         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 466         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 467         arm7tdmi_clock_data_in(jtag_info, xpsr);
 468
 469 }
 470
 471 void arm7tdmi_write_xpsr(target_t *target, u32 xpsr, int spsr)
 472 {
 473         /* get pointers to arch-specific information */
 474         armv4_5_common_t *armv4_5 = target->arch_info;
 475         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 476         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 477
 478         DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 479
 480         /* MSR1 fetched */
 481         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 482         /* MSR2 fetched, MSR1 in DECODE */
 483         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 484         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 485         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 486         /* nothing fetched, MSR1 in EXECUTE (2) */
 487         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 488         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 489         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 490         /* nothing fetched, MSR2 in EXECUTE (2) */
 491         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 492         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 493         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 494         /* nothing fetched, MSR3 in EXECUTE (2) */
 495         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 496         /* NOP fetched, MSR4 in EXECUTE (1) */
 497         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 498         /* nothing fetched, MSR4 in EXECUTE (2) */
 499         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 500 }
 501
 502 void arm7tdmi_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 503 {
 504         /* get pointers to arch-specific information */
 505         armv4_5_common_t *armv4_5 = target->arch_info;
 506         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 507         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 508
 509         DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 510
 511         /* MSR fetched */
 512         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 513         /* NOP fetched, MSR in DECODE */
 514         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 515         /* NOP fetched, MSR in EXECUTE (1) */
 516         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 517         /* nothing fetched, MSR in EXECUTE (2) */
 518         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 519
 520 }
 521
 522 void arm7tdmi_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 523 {
 524         int i;
 525         /* get pointers to arch-specific information */
 526         armv4_5_common_t *armv4_5 = target->arch_info;
 527         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 528         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 529
 530         /* LDMIA r0-15, [r0] at debug speed
 531         * register values will start to appear on 4th DCLK
 532         */
 533         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 534
 535         /* fetch NOP, LDM in DECODE stage */
 536         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 537         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 539
 540         for (i = 0; i <= 15; i++)
 541         {
 542                 if (mask & (1 << i))
 543                         /* nothing fetched, LDM still in EXECUTE (1+i cycle) */
 544                         arm7tdmi_clock_out(jtag_info, core_regs[i], NULL, 0);
 545         }
 546         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 547
 548 }
 549
 550 void arm7tdmi_load_word_regs(target_t *target, u32 mask)
 551 {
 552         /* get pointers to arch-specific information */
 553         armv4_5_common_t *armv4_5 = target->arch_info;
 554         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 555         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 556
 557         /* put system-speed load-multiple into the pipeline */
 558         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 559         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 560         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 561
 562 }
 563
 564 void arm7tdmi_load_hword_reg(target_t *target, int num)
 565 {
 566         /* get pointers to arch-specific information */
 567         armv4_5_common_t *armv4_5 = target->arch_info;
 568         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 569         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 570
 571         /* put system-speed load half-word into the pipeline */
 572         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 573         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 574         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 575
 576 }
 577
 578 void arm7tdmi_load_byte_reg(target_t *target, int num)
 579 {
 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         /* put system-speed load byte into the pipeline */
 586         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 587         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 588         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 589
 590 }
 591
 592 void arm7tdmi_store_word_regs(target_t *target, u32 mask)
 593 {
 594         /* get pointers to arch-specific information */
 595         armv4_5_common_t *armv4_5 = target->arch_info;
 596         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 597         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 598
 599         /* put system-speed store-multiple into the pipeline */
 600         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 601         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 602         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 603
 604 }
 605
 606 void arm7tdmi_store_hword_reg(target_t *target, int num)
 607 {
 608         /* get pointers to arch-specific information */
 609         armv4_5_common_t *armv4_5 = target->arch_info;
 610         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 611         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 612
 613         /* put system-speed store half-word into the pipeline */
 614         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 615         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 616         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 617
 618 }
 619
 620 void arm7tdmi_store_byte_reg(target_t *target, int num)
 621 {
 622         /* get pointers to arch-specific information */
 623         armv4_5_common_t *armv4_5 = target->arch_info;
 624         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 625         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 626
 627         /* put system-speed store byte into the pipeline */
 628         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 629         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 630         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 631
 632 }
 633
 634 void arm7tdmi_write_pc(target_t *target, u32 pc)
 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         /* LDMIA r0-15, [r0] at debug speed
 642          * register values will start to appear on 4th DCLK
 643          */
 644         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 645         /* fetch NOP, LDM in DECODE stage */
 646         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 647         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 648         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 649         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 650         arm7tdmi_clock_out(jtag_info, pc, NULL, 0);
 651         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 652         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 653         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 654         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 655         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 656         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 657         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 658         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 659 }
 660
 661 void arm7tdmi_branch_resume(target_t *target)
 662 {
 663         /* get pointers to arch-specific information */
 664         armv4_5_common_t *armv4_5 = target->arch_info;
 665         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 666         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 667
 668         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 669         arm7tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffffa, 0), NULL, 0);
 670
 671 }
 672
 673 void arm7tdmi_branch_resume_thumb(target_t *target)
 674 {
 675         DEBUG("-");
 676
 677         /* get pointers to arch-specific information */
 678         armv4_5_common_t *armv4_5 = target->arch_info;
 679         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 680         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 681         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 682
 683         /* LDMIA r0, [r0] at debug speed
 684          * register values will start to appear on 4th DCLK
 685          */
 686         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 687
 688         /* fetch NOP, LDM in DECODE stage */
 689         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 690         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 691         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 692         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 693         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 694         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 695         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 696
 697         /* Branch and eXchange */
 698         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 699
 700         embeddedice_read_reg(dbg_stat);
 701
 702         /* fetch NOP, BX in DECODE stage */
 703         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 704
 705         /* target is now in Thumb state */
 706         embeddedice_read_reg(dbg_stat);
 707
 708         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 709         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 710
 711         /* target is now in Thumb state */
 712         embeddedice_read_reg(dbg_stat);
 713
 714         /* load r0 value */
 715         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 716         /* fetch NOP, LDR in Decode */
 717         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 718         /* fetch NOP, LDR in Execute */
 719         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 720         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 721         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 722         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 723         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 724
 725         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 726         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 727
 728         embeddedice_read_reg(dbg_stat);
 729
 730         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 731         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 732
 733 }
 734
 735 void arm7tdmi_build_reg_cache(target_t *target)
 736 {
 737         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 738         /* get pointers to arch-specific information */
 739         armv4_5_common_t *armv4_5 = target->arch_info;
 740         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 741         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 742
 743         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 744         armv4_5->core_cache = (*cache_p);
 745
 746         (*cache_p)->next = embeddedice_build_reg_cache(target, arm7_9);
 747         arm7_9->eice_cache = (*cache_p)->next;
 748
 749         if (arm7_9->etm_ctx)
 750         {
 751                 (*cache_p)->next->next = etm_build_reg_cache(target, jtag_info, arm7_9->etm_ctx);
 752                 arm7_9->etm_ctx->reg_cache = (*cache_p)->next->next;
 753         }
 754 }
 755
 756 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 757 {
 758
 759         arm7tdmi_build_reg_cache(target);
 760
 761         return ERROR_OK;
 762
 763 }
 764
 765 int arm7tdmi_quit()
 766 {
 767
 768         return ERROR_OK;
 769 }
 770
 771 int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int chain_pos, char *variant)
 772 {
 773         armv4_5_common_t *armv4_5;
 774         arm7_9_common_t *arm7_9;
 775
 776         arm7_9 = &arm7tdmi->arm7_9_common;
 777         armv4_5 = &arm7_9->armv4_5_common;
 778
 779         /* prepare JTAG information for the new target */
 780         arm7_9->jtag_info.chain_pos = chain_pos;
 781         arm7_9->jtag_info.scann_size = 4;
 782
 783         /* register arch-specific functions */
 784         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 785         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 786         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 787         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 788         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 789
 790         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 791         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 792         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 793
 794         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 795         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 796         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 797
 798         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 799         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 800         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 801
 802         arm7_9->write_pc = arm7tdmi_write_pc;
 803         arm7_9->branch_resume = arm7tdmi_branch_resume;
 804         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 805
 806         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 807         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 808
 809         arm7_9->pre_debug_entry = NULL;
 810         arm7_9->post_debug_entry = NULL;
 811
 812         arm7_9->pre_restore_context = NULL;
 813         arm7_9->post_restore_context = NULL;
 814
 815         /* initialize arch-specific breakpoint handling */
 816         arm7_9->arm_bkpt = 0xdeeedeee;
 817         arm7_9->thumb_bkpt = 0xdeee;
 818
 819         arm7_9->sw_bkpts_use_wp = 1;
 820         arm7_9->sw_bkpts_enabled = 0;
 821         arm7_9->dbgreq_adjust_pc = 2;
 822         arm7_9->arch_info = arm7tdmi;
 823
 824         arm7tdmi->arch_info = NULL;
 825         arm7tdmi->common_magic = ARM7TDMI_COMMON_MAGIC;
 826
 827         if (variant)
 828         {
 829                 arm7tdmi->variant = strdup(variant);
 830         }
 831         else
 832         {
 833                 arm7tdmi->variant = strdup("");
 834         }
 835
 836         arm7_9_init_arch_info(target, arm7_9);
 837
 838         return ERROR_OK;
 839 }
 840
 841 /* target arm7tdmi <endianess> <startup_mode> <chain_pos> <variant> */
 842 int arm7tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 843 {
 844         int chain_pos;
 845         char *variant = NULL;
 846         arm7tdmi_common_t *arm7tdmi = malloc(sizeof(arm7tdmi_common_t));
 847
 848         if (argc < 4)
 849         {
 850                 ERROR("'target arm7tdmi' requires at least one additional argument");
 851                 exit(-1);
 852         }
 853
 854         chain_pos = strtoul(args[3], NULL, 0);
 855
 856         if (argc >= 5)
 857                 variant = args[4];
 858
 859         arm7tdmi_init_arch_info(target, arm7tdmi, chain_pos, variant);
 860
 861         return ERROR_OK;
 862 }
 863
 864 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx)
 865 {
 866         int retval;
 867
 868         retval = arm7_9_register_commands(cmd_ctx);
 869
 870         return ERROR_OK;
 871
 872 }
 873