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   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(void);
  50
  51 /* target function declarations */
  52 int 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
  72         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  73
  74         .read_memory = arm7_9_read_memory,
  75         .write_memory = arm7_9_write_memory,
  76         .bulk_write_memory = arm7_9_bulk_write_memory,
  77         .checksum_memory = arm7_9_checksum_memory,
  78         .blank_check_memory = arm7_9_blank_check_memory,
  79
  80         .run_algorithm = armv4_5_run_algorithm,
  81
  82         .add_breakpoint = arm7_9_add_breakpoint,
  83         .remove_breakpoint = arm7_9_remove_breakpoint,
  84         .add_watchpoint = arm7_9_add_watchpoint,
  85         .remove_watchpoint = arm7_9_remove_watchpoint,
  86
  87         .register_commands = arm7tdmi_register_commands,
  88         .target_command = arm7tdmi_target_command,
  89         .init_target = arm7tdmi_init_target,
  90         .examine = arm7tdmi_examine,
  91         .quit = arm7tdmi_quit
  92 };
  93
  94 int arm7tdmi_examine_debug_reason(target_t *target)
  95 {
  96         /* get pointers to arch-specific information */
  97         armv4_5_common_t *armv4_5 = target->arch_info;
  98         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  99
 100         /* only check the debug reason if we don't know it already */
 101         if ((target->debug_reason != DBG_REASON_DBGRQ)
 102                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
 103         {
 104                 scan_field_t fields[2];
 105                 u8 databus[4];
 106                 u8 breakpoint;
 107
 108                 jtag_add_end_state(TAP_PD);
 109
 110                 fields[0].device = arm7_9->jtag_info.chain_pos;
 111                 fields[0].num_bits = 1;
 112                 fields[0].out_value = NULL;
 113                 fields[0].out_mask = NULL;
 114                 fields[0].in_value = &breakpoint;
 115                 fields[0].in_check_value = NULL;
 116                 fields[0].in_check_mask = NULL;
 117                 fields[0].in_handler = NULL;
 118                 fields[0].in_handler_priv = NULL;
 119
 120                 fields[1].device = arm7_9->jtag_info.chain_pos;
 121                 fields[1].num_bits = 32;
 122                 fields[1].out_value = NULL;
 123                 fields[1].out_mask = NULL;
 124                 fields[1].in_value = databus;
 125                 fields[1].in_check_value = NULL;
 126                 fields[1].in_check_mask = NULL;
 127                 fields[1].in_handler = NULL;
 128                 fields[1].in_handler_priv = NULL;
 129
 130                 arm_jtag_scann(&arm7_9->jtag_info, 0x1);
 131                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
 132
 133                 jtag_add_dr_scan(2, fields, TAP_PD);
 134                 jtag_execute_queue();
 135
 136                 fields[0].in_value = NULL;
 137                 fields[0].out_value = &breakpoint;
 138                 fields[1].in_value = NULL;
 139                 fields[1].out_value = databus;
 140
 141                 jtag_add_dr_scan(2, fields, TAP_PD);
 142
 143                 if (breakpoint & 1)
 144                         target->debug_reason = DBG_REASON_WATCHPOINT;
 145                 else
 146                         target->debug_reason = DBG_REASON_BREAKPOINT;
 147         }
 148
 149         return ERROR_OK;
 150 }
 151
 152 static int arm7tdmi_num_bits[]={1, 32};
 153 static __inline int arm7tdmi_clock_out_inner(arm_jtag_t *jtag_info, u32 out, int breakpoint)
 154 {
 155         u32 values[2]={breakpoint, flip_u32(out, 32)};
 156
 157         jtag_add_dr_out(jtag_info->chain_pos,
 158                         2,
 159                         arm7tdmi_num_bits,
 160                         values,
 161                         -1);
 162
 163         jtag_add_runtest(0, -1);
 164
 165         return ERROR_OK;
 166 }
 167
 168 /* put an instruction in the ARM7TDMI pipeline or write the data bus, and optionally read data */
 169 static __inline int arm7tdmi_clock_out(arm_jtag_t *jtag_info, u32 out, u32 *deprecated, int breakpoint)
 170 {
 171         jtag_add_end_state(TAP_PD);
 172         arm_jtag_scann(jtag_info, 0x1);
 173         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 174
 175         return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
 176 }
 177
 178 /* clock the target, reading the databus */
 179 int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 180 {
 181         scan_field_t fields[2];
 182
 183         jtag_add_end_state(TAP_PD);
 184         arm_jtag_scann(jtag_info, 0x1);
 185         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 186
 187         fields[0].device = jtag_info->chain_pos;
 188         fields[0].num_bits = 1;
 189         fields[0].out_value = NULL;
 190         fields[0].out_mask = NULL;
 191         fields[0].in_value = NULL;
 192         fields[0].in_check_value = NULL;
 193         fields[0].in_check_mask = NULL;
 194         fields[0].in_handler = NULL;
 195         fields[0].in_handler_priv = NULL;
 196
 197         fields[1].device = jtag_info->chain_pos;
 198         fields[1].num_bits = 32;
 199         fields[1].out_value = NULL;
 200         fields[1].out_mask = NULL;
 201         fields[1].in_value = NULL;
 202         fields[1].in_handler = arm_jtag_buf_to_u32_flip;
 203         fields[1].in_handler_priv = in;
 204         fields[1].in_check_value = NULL;
 205         fields[1].in_check_mask = NULL;
 206
 207         jtag_add_dr_scan(2, fields, -1);
 208
 209         jtag_add_runtest(0, -1);
 210
 211 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 212 {
 213                 jtag_execute_queue();
 214
 215                 if (in)
 216                 {
 217                         LOG_DEBUG("in: 0x%8.8x", *in);
 218                 }
 219                 else
 220                 {
 221                         LOG_ERROR("BUG: called with in == NULL");
 222                 }
 223 }
 224 #endif
 225
 226         return ERROR_OK;
 227 }
 228
 229 /* clock the target, and read the databus
 230  * the *in pointer points to a buffer where elements of 'size' bytes
 231  * are stored in big (be==1) or little (be==0) endianness
 232  */
 233 int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
 234 {
 235         scan_field_t fields[2];
 236
 237         jtag_add_end_state(TAP_PD);
 238         arm_jtag_scann(jtag_info, 0x1);
 239         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 240
 241         fields[0].device = jtag_info->chain_pos;
 242         fields[0].num_bits = 1;
 243         fields[0].out_value = NULL;
 244         fields[0].out_mask = NULL;
 245         fields[0].in_value = NULL;
 246         fields[0].in_check_value = NULL;
 247         fields[0].in_check_mask = NULL;
 248         fields[0].in_handler = NULL;
 249         fields[0].in_handler_priv = NULL;
 250
 251         fields[1].device = jtag_info->chain_pos;
 252         fields[1].num_bits = 32;
 253         fields[1].out_value = NULL;
 254         fields[1].out_mask = NULL;
 255         fields[1].in_value = NULL;
 256         switch (size)
 257         {
 258                 case 4:
 259                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be32_flip : arm_jtag_buf_to_le32_flip;
 260                         break;
 261                 case 2:
 262                         fields[1].in_handler = (be) ? arm_jtag_buf_to_be16_flip : arm_jtag_buf_to_le16_flip;
 263                         break;
 264                 case 1:
 265                         fields[1].in_handler = arm_jtag_buf_to_8_flip;
 266                         break;
 267         }
 268         fields[1].in_handler_priv = in;
 269         fields[1].in_check_value = NULL;
 270         fields[1].in_check_mask = NULL;
 271
 272         jtag_add_dr_scan(2, fields, -1);
 273
 274         jtag_add_runtest(0, -1);
 275
 276 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 277 {
 278                 jtag_execute_queue();
 279
 280                 if (in)
 281                 {
 282                         LOG_DEBUG("in: 0x%8.8x", *(u32*)in);
 283                 }
 284                 else
 285                 {
 286                         LOG_ERROR("BUG: called with in == NULL");
 287                 }
 288 }
 289 #endif
 290
 291         return ERROR_OK;
 292 }
 293
 294 void arm7tdmi_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 295 {
 296         /* get pointers to arch-specific information */
 297         armv4_5_common_t *armv4_5 = target->arch_info;
 298         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 299         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 300
 301         /* save r0 before using it and put system in ARM state
 302          * to allow common handling of ARM and THUMB debugging */
 303
 304         /* fetch STR r0, [r0] */
 305         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 306         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 307         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 308         /* nothing fetched, STR r0, [r0] in Execute (2) */
 309         arm7tdmi_clock_data_in(jtag_info, r0);
 310
 311         /* MOV r0, r15 fetched, STR in Decode */
 312         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 313         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 314         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 315         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 316         /* nothing fetched, STR r0, [r0] in Execute (2) */
 317         arm7tdmi_clock_data_in(jtag_info, pc);
 318
 319         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 320         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 321         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 322         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 323         /* nothing fetched, data for LDR r0, [PC, #0] */
 324         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 325         /* nothing fetched, data from previous cycle is written to register */
 326         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 327
 328         /* fetch BX */
 329         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 330         /* NOP fetched, BX in Decode, MOV in Execute */
 331         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 332         /* NOP fetched, BX in Execute (1) */
 333         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 334
 335         jtag_execute_queue();
 336
 337         /* fix program counter:
 338          * MOV r0, r15 was the 4th instruction (+6)
 339          * reading PC in Thumb state gives address of instruction + 4
 340          */
 341         *pc -= 0xa;
 342
 343 }
 344
 345 void arm7tdmi_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 346 {
 347         int i;
 348         /* get pointers to arch-specific information */
 349         armv4_5_common_t *armv4_5 = target->arch_info;
 350         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 351         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 352
 353         /* STMIA r0-15, [r0] at debug speed
 354          * register values will start to appear on 4th DCLK
 355          */
 356         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 357
 358         /* fetch NOP, STM in DECODE stage */
 359         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 360         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 361         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 362
 363         for (i = 0; i <= 15; i++)
 364         {
 365                 if (mask & (1 << i))
 366                         /* nothing fetched, STM still in EXECUTE (1+i cycle) */
 367                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 368         }
 369
 370 }
 371
 372 void arm7tdmi_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 373 {
 374         int i;
 375         /* get pointers to arch-specific information */
 376         armv4_5_common_t *armv4_5 = target->arch_info;
 377         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 378         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 379         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 380         u32 *buf_u32 = buffer;
 381         u16 *buf_u16 = buffer;
 382         u8 *buf_u8 = buffer;
 383
 384         /* STMIA r0-15, [r0] at debug speed
 385          * register values will start to appear on 4th DCLK
 386          */
 387         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 388
 389         /* fetch NOP, STM in DECODE stage */
 390         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 391         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 392         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 393
 394         for (i = 0; i <= 15; i++)
 395         {
 396                 /* nothing fetched, STM still in EXECUTE (1+i cycle), read databus */
 397                 if (mask & (1 << i))
 398                 {
 399                         switch (size)
 400                         {
 401                                 case 4:
 402                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 403                                         break;
 404                                 case 2:
 405                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 406                                         break;
 407                                 case 1:
 408                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 409                                         break;
 410                         }
 411                 }
 412         }
 413
 414 }
 415
 416 void arm7tdmi_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 417 {
 418         /* get pointers to arch-specific information */
 419         armv4_5_common_t *armv4_5 = target->arch_info;
 420         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 421         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 422
 423         /* MRS r0, cpsr */
 424         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 425
 426         /* STR r0, [r15] */
 427         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 428         /* fetch NOP, STR in DECODE stage */
 429         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 430         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 431         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 432         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 433         arm7tdmi_clock_data_in(jtag_info, xpsr);
 434
 435 }
 436
 437 void arm7tdmi_write_xpsr(target_t *target, u32 xpsr, int spsr)
 438 {
 439         /* get pointers to arch-specific information */
 440         armv4_5_common_t *armv4_5 = target->arch_info;
 441         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 442         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 443
 444         LOG_DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 445
 446         /* MSR1 fetched */
 447         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 448         /* MSR2 fetched, MSR1 in DECODE */
 449         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 450         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 451         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 452         /* nothing fetched, MSR1 in EXECUTE (2) */
 453         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 454         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 455         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 456         /* nothing fetched, MSR2 in EXECUTE (2) */
 457         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 458         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 459         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 460         /* nothing fetched, MSR3 in EXECUTE (2) */
 461         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 462         /* NOP fetched, MSR4 in EXECUTE (1) */
 463         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 464         /* nothing fetched, MSR4 in EXECUTE (2) */
 465         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 466 }
 467
 468 void arm7tdmi_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 469 {
 470         /* get pointers to arch-specific information */
 471         armv4_5_common_t *armv4_5 = target->arch_info;
 472         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 473         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 474
 475         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 476
 477         /* MSR fetched */
 478         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 479         /* NOP fetched, MSR in DECODE */
 480         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 481         /* NOP fetched, MSR in EXECUTE (1) */
 482         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 483         /* nothing fetched, MSR in EXECUTE (2) */
 484         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 485
 486 }
 487
 488 void arm7tdmi_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 489 {
 490         int i;
 491         /* get pointers to arch-specific information */
 492         armv4_5_common_t *armv4_5 = target->arch_info;
 493         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 494         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 495
 496         /* LDMIA r0-15, [r0] at debug speed
 497         * register values will start to appear on 4th DCLK
 498         */
 499         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 500
 501         /* fetch NOP, LDM in DECODE stage */
 502         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 503         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 504         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 505
 506         for (i = 0; i <= 15; i++)
 507         {
 508                 if (mask & (1 << i))
 509                         /* nothing fetched, LDM still in EXECUTE (1+i cycle) */
 510                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 511         }
 512         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 513
 514 }
 515
 516 void arm7tdmi_load_word_regs(target_t *target, u32 mask)
 517 {
 518         /* get pointers to arch-specific information */
 519         armv4_5_common_t *armv4_5 = target->arch_info;
 520         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 521         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 522
 523         /* put system-speed load-multiple into the pipeline */
 524         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 525         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 526         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 527
 528 }
 529
 530 void arm7tdmi_load_hword_reg(target_t *target, int num)
 531 {
 532         /* get pointers to arch-specific information */
 533         armv4_5_common_t *armv4_5 = target->arch_info;
 534         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 535         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 536
 537         /* put system-speed load half-word into the pipeline */
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 539         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 540         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 541
 542 }
 543
 544 void arm7tdmi_load_byte_reg(target_t *target, int num)
 545 {
 546         /* get pointers to arch-specific information */
 547         armv4_5_common_t *armv4_5 = target->arch_info;
 548         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 549         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 550
 551         /* put system-speed load byte into the pipeline */
 552         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 553         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 554         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 555
 556 }
 557
 558 void arm7tdmi_store_word_regs(target_t *target, u32 mask)
 559 {
 560         /* get pointers to arch-specific information */
 561         armv4_5_common_t *armv4_5 = target->arch_info;
 562         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 563         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 564
 565         /* put system-speed store-multiple into the pipeline */
 566         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 567         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 568         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 569
 570 }
 571
 572 void arm7tdmi_store_hword_reg(target_t *target, int num)
 573 {
 574         /* get pointers to arch-specific information */
 575         armv4_5_common_t *armv4_5 = target->arch_info;
 576         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 577         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 578
 579         /* put system-speed store half-word into the pipeline */
 580         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 581         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 582         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 583
 584 }
 585
 586 void arm7tdmi_store_byte_reg(target_t *target, int num)
 587 {
 588         /* get pointers to arch-specific information */
 589         armv4_5_common_t *armv4_5 = target->arch_info;
 590         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 591         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 592
 593         /* put system-speed store byte into the pipeline */
 594         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 595         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 596         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 597
 598 }
 599
 600 void arm7tdmi_write_pc(target_t *target, u32 pc)
 601 {
 602         /* get pointers to arch-specific information */
 603         armv4_5_common_t *armv4_5 = target->arch_info;
 604         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 605         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 606
 607         /* LDMIA r0-15, [r0] at debug speed
 608          * register values will start to appear on 4th DCLK
 609          */
 610         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 611         /* fetch NOP, LDM in DECODE stage */
 612         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 613         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 614         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 615         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 616         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 617         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 618         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 619         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 620         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 621         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 622         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 623         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 624         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 625 }
 626
 627 void arm7tdmi_branch_resume(target_t *target)
 628 {
 629         /* get pointers to arch-specific information */
 630         armv4_5_common_t *armv4_5 = target->arch_info;
 631         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 632         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 633
 634         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 635         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 636
 637 }
 638
 639 void arm7tdmi_branch_resume_thumb(target_t *target)
 640 {
 641         LOG_DEBUG("-");
 642
 643         /* get pointers to arch-specific information */
 644         armv4_5_common_t *armv4_5 = target->arch_info;
 645         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 646         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 647         reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 648
 649         /* LDMIA r0, [r0] at debug speed
 650          * register values will start to appear on 4th DCLK
 651          */
 652         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 653
 654         /* fetch NOP, LDM in DECODE stage */
 655         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 656         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 657         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 658         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 659         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 660         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 661         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 662
 663         /* Branch and eXchange */
 664         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 665
 666         embeddedice_read_reg(dbg_stat);
 667
 668         /* fetch NOP, BX in DECODE stage */
 669         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 670
 671         /* target is now in Thumb state */
 672         embeddedice_read_reg(dbg_stat);
 673
 674         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 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         /* load r0 value */
 681         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 682         /* fetch NOP, LDR in Decode */
 683         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 684         /* fetch NOP, LDR in Execute */
 685         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 686         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 687         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 688         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 689         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 690
 691         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 692         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 693
 694         embeddedice_read_reg(dbg_stat);
 695
 696         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 697         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 698
 699 }
 700
 701 void arm7tdmi_build_reg_cache(target_t *target)
 702 {
 703         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 704         /* get pointers to arch-specific information */
 705         armv4_5_common_t *armv4_5 = target->arch_info;
 706
 707         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 708         armv4_5->core_cache = (*cache_p);
 709 }
 710
 711 int arm7tdmi_examine(struct target_s *target)
 712 {
 713         int retval;
 714         armv4_5_common_t *armv4_5 = target->arch_info;
 715         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 716         if (!target->type->examined)
 717         {
 718                 /* get pointers to arch-specific information */
 719                 reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 720                 reg_cache_t *t=embeddedice_build_reg_cache(target, arm7_9);
 721                 if (t==NULL)
 722                         return ERROR_FAIL;
 723
 724                 (*cache_p) = t;
 725                 arm7_9->eice_cache = (*cache_p);
 726
 727                 if (arm7_9->etm_ctx)
 728                 {
 729                         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 730                         (*cache_p)->next = etm_build_reg_cache(target, jtag_info, arm7_9->etm_ctx);
 731                         arm7_9->etm_ctx->reg_cache = (*cache_p)->next;
 732                 }
 733                 target->type->examined = 1;
 734         }
 735         if ((retval=embeddedice_setup(target))!=ERROR_OK)
 736                 return retval;
 737         if ((retval=arm7_9_setup(target))!=ERROR_OK)
 738                 return retval;
 739         if (arm7_9->etm_ctx)
 740         {
 741                 if ((retval=etm_setup(target))!=ERROR_OK)
 742                         return retval;
 743         }
 744         return ERROR_OK;
 745 }
 746
 747 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 748 {
 749
 750         arm7tdmi_build_reg_cache(target);
 751
 752         return ERROR_OK;
 753
 754 }
 755
 756 int arm7tdmi_quit(void)
 757 {
 758
 759         return ERROR_OK;
 760 }
 761
 762 int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int chain_pos, char *variant)
 763 {
 764         armv4_5_common_t *armv4_5;
 765         arm7_9_common_t *arm7_9;
 766
 767         arm7_9 = &arm7tdmi->arm7_9_common;
 768         armv4_5 = &arm7_9->armv4_5_common;
 769
 770         /* prepare JTAG information for the new target */
 771         arm7_9->jtag_info.chain_pos = chain_pos;
 772         arm7_9->jtag_info.scann_size = 4;
 773
 774         /* register arch-specific functions */
 775         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 776         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 777         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 778         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 779         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 780
 781         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 782         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 783         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 784
 785         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 786         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 787         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 788
 789         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 790         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 791         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 792
 793         arm7_9->write_pc = arm7tdmi_write_pc;
 794         arm7_9->branch_resume = arm7tdmi_branch_resume;
 795         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 796
 797         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 798         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 799
 800         arm7_9->pre_debug_entry = NULL;
 801         arm7_9->post_debug_entry = NULL;
 802
 803         arm7_9->pre_restore_context = NULL;
 804         arm7_9->post_restore_context = NULL;
 805
 806         /* initialize arch-specific breakpoint handling */
 807         arm7_9->arm_bkpt = 0xdeeedeee;
 808         arm7_9->thumb_bkpt = 0xdeee;
 809
 810         arm7_9->sw_bkpts_use_wp = 1;
 811         arm7_9->sw_bkpts_enabled = 0;
 812         arm7_9->dbgreq_adjust_pc = 2;
 813         arm7_9->arch_info = arm7tdmi;
 814
 815         arm7tdmi->arch_info = NULL;
 816         arm7tdmi->common_magic = ARM7TDMI_COMMON_MAGIC;
 817
 818         if (variant)
 819         {
 820                 arm7tdmi->variant = strdup(variant);
 821         }
 822         else
 823         {
 824                 arm7tdmi->variant = strdup("");
 825         }
 826
 827         arm7_9_init_arch_info(target, arm7_9);
 828
 829         return ERROR_OK;
 830 }
 831
 832 /* target arm7tdmi <endianess> <startup_mode> <chain_pos> <variant> */
 833 int arm7tdmi_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 834 {
 835         int chain_pos;
 836         char *variant = NULL;
 837         arm7tdmi_common_t *arm7tdmi = malloc(sizeof(arm7tdmi_common_t));
 838         memset(arm7tdmi, 0, sizeof(*arm7tdmi));
 839
 840         if (argc < 4)
 841         {
 842                 LOG_ERROR("'target arm7tdmi' requires at least one additional argument");
 843                 exit(-1);
 844         }
 845
 846         chain_pos = strtoul(args[3], NULL, 0);
 847
 848         if (argc >= 5)
 849                 variant = args[4];
 850
 851         arm7tdmi_init_arch_info(target, arm7tdmi, chain_pos, variant);
 852
 853         return ERROR_OK;
 854 }
 855
 856 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx)
 857 {
 858         int retval;
 859
 860         retval = arm7_9_register_commands(cmd_ctx);
 861
 862         return ERROR_OK;
 863
 864 }
 865