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 /*
  35  * For information about ARM7TDMI, see ARM DDI 0210C (r4p1)
  36  * or ARM DDI 0029G (r3).  "Debug In Depth", Appendix B,
  37  * covers JTAG support.
  38  */
  39
  40 #if 0
  41 #define _DEBUG_INSTRUCTION_EXECUTION_
  42 #endif
  43
  44 static int arm7tdmi_examine_debug_reason(struct target *target)
  45 {
  46         int retval = ERROR_OK;
  47         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  48
  49         /* only check the debug reason if we don't know it already */
  50         if ((target->debug_reason != DBG_REASON_DBGRQ)
  51                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
  52         {
  53                 struct scan_field fields[2];
  54                 uint8_t databus[4];
  55                 uint8_t breakpoint;
  56
  57                 jtag_set_end_state(TAP_DRPAUSE);
  58
  59                 fields[0].tap = arm7_9->jtag_info.tap;
  60                 fields[0].num_bits = 1;
  61                 fields[0].out_value = NULL;
  62                 fields[0].in_value = &breakpoint;
  63
  64                 fields[1].tap = arm7_9->jtag_info.tap;
  65                 fields[1].num_bits = 32;
  66                 fields[1].out_value = NULL;
  67                 fields[1].in_value = databus;
  68
  69                 if ((retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1)) != ERROR_OK)
  70                 {
  71                         return retval;
  72                 }
  73                 arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
  74
  75                 jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
  76                 if ((retval = jtag_execute_queue()) != ERROR_OK)
  77                 {
  78                         return retval;
  79                 }
  80
  81                 fields[0].in_value = NULL;
  82                 fields[0].out_value = &breakpoint;
  83                 fields[1].in_value = NULL;
  84                 fields[1].out_value = databus;
  85
  86                 jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
  87
  88                 if (breakpoint & 1)
  89                         target->debug_reason = DBG_REASON_WATCHPOINT;
  90                 else
  91                         target->debug_reason = DBG_REASON_BREAKPOINT;
  92         }
  93
  94         return ERROR_OK;
  95 }
  96
  97 static const int arm7tdmi_num_bits[] = {1, 32};
  98
  99 static __inline int arm7tdmi_clock_out_inner(struct arm_jtag *jtag_info, uint32_t out, int breakpoint)
 100 {
 101         uint32_t values[2]={breakpoint, flip_u32(out, 32)};
 102
 103         jtag_add_dr_out(jtag_info->tap,
 104                         2,
 105                         arm7tdmi_num_bits,
 106                         values,
 107                         jtag_get_end_state());
 108
 109         jtag_add_runtest(0, jtag_get_end_state());
 110
 111         return ERROR_OK;
 112 }
 113
 114 /* put an instruction in the ARM7TDMI pipeline or write the data bus,
 115  * and optionally read data
 116  *
 117  * FIXME remove the unused "deprecated" parameter
 118  */
 119 static __inline int arm7tdmi_clock_out(struct arm_jtag *jtag_info,
 120                 uint32_t out, uint32_t *deprecated, int breakpoint)
 121 {
 122         jtag_set_end_state(TAP_DRPAUSE);
 123         arm_jtag_scann(jtag_info, 0x1);
 124         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 125
 126         return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
 127 }
 128
 129 /* clock the target, reading the databus */
 130 static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in)
 131 {
 132         int retval = ERROR_OK;
 133         struct scan_field fields[2];
 134
 135         jtag_set_end_state(TAP_DRPAUSE);
 136         if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
 137         {
 138                 return retval;
 139         }
 140         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 141
 142         fields[0].tap = jtag_info->tap;
 143         fields[0].num_bits = 1;
 144         fields[0].out_value = NULL;
 145         fields[0].in_value = NULL;
 146
 147         fields[1].tap = jtag_info->tap;
 148         fields[1].num_bits = 32;
 149         fields[1].out_value = NULL;
 150         fields[1].in_value = (uint8_t *)in;
 151
 152         jtag_add_dr_scan(2, fields, jtag_get_end_state());
 153
 154         jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
 155
 156         jtag_add_runtest(0, jtag_get_end_state());
 157
 158 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 159         if ((retval = jtag_execute_queue()) != ERROR_OK)
 160                 return retval;
 161
 162         if (in)
 163                 LOG_DEBUG("in: 0x%8.8x", *in);
 164         else
 165                 LOG_ERROR("BUG: called with in == NULL");
 166 #endif
 167
 168         return ERROR_OK;
 169 }
 170
 171 void arm_endianness(uint8_t *tmp, void *in, int size, int be, int flip)
 172 {
 173         uint32_t readback = le_to_h_u32(tmp);
 174         if (flip)
 175                 readback = flip_u32(readback, 32);
 176         switch (size)
 177         {
 178                 case 4:
 179                         if (be)
 180                         {
 181                                 h_u32_to_be(((uint8_t*)in), readback);
 182                         } else
 183                         {
 184                                  h_u32_to_le(((uint8_t*)in), readback);
 185                         }
 186                         break;
 187                 case 2:
 188                         if (be)
 189                         {
 190                                 h_u16_to_be(((uint8_t*)in), readback & 0xffff);
 191                         } else
 192                         {
 193                                 h_u16_to_le(((uint8_t*)in), readback & 0xffff);
 194                         }
 195                         break;
 196                 case 1:
 197                         *((uint8_t *)in)= readback & 0xff;
 198                         break;
 199         }
 200 }
 201
 202 static int arm7endianness(jtag_callback_data_t arg,
 203         jtag_callback_data_t size, jtag_callback_data_t be,
 204         jtag_callback_data_t captured)
 205 {
 206         uint8_t *in = (uint8_t *)arg;
 207
 208         arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1);
 209         return ERROR_OK;
 210 }
 211
 212 /* clock the target, and read the databus
 213  * the *in pointer points to a buffer where elements of 'size' bytes
 214  * are stored in big (be == 1) or little (be == 0) endianness
 215  */
 216 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
 217                 void *in, int size, int be)
 218 {
 219         int retval = ERROR_OK;
 220         struct scan_field fields[2];
 221
 222         jtag_set_end_state(TAP_DRPAUSE);
 223         if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
 224         {
 225                 return retval;
 226         }
 227         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 228
 229         fields[0].tap = jtag_info->tap;
 230         fields[0].num_bits = 1;
 231         fields[0].out_value = NULL;
 232         fields[0].in_value = NULL;
 233
 234         fields[1].tap = jtag_info->tap;
 235         fields[1].num_bits = 32;
 236         fields[1].out_value = NULL;
 237         jtag_alloc_in_value32(&fields[1]);
 238
 239         jtag_add_dr_scan(2, fields, jtag_get_end_state());
 240
 241         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);
 242
 243         jtag_add_runtest(0, jtag_get_end_state());
 244
 245 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 246 {
 247                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 248                 {
 249                         return retval;
 250                 }
 251
 252                 if (in)
 253                 {
 254                         LOG_DEBUG("in: 0x%8.8x", *(uint32_t*)in);
 255                 }
 256                 else
 257                 {
 258                         LOG_ERROR("BUG: called with in == NULL");
 259                 }
 260 }
 261 #endif
 262
 263         return ERROR_OK;
 264 }
 265
 266 static void arm7tdmi_change_to_arm(struct target *target,
 267                 uint32_t *r0, uint32_t *pc)
 268 {
 269         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 270         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 271
 272         /* save r0 before using it and put system in ARM state
 273          * to allow common handling of ARM and THUMB debugging */
 274
 275         /* fetch STR r0, [r0] */
 276         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 277         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 278         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 279         /* nothing fetched, STR r0, [r0] in Execute (2) */
 280         arm7tdmi_clock_data_in(jtag_info, r0);
 281
 282         /* MOV r0, r15 fetched, STR in Decode */
 283         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 284         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 285         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 286         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 287         /* nothing fetched, STR r0, [r0] in Execute (2) */
 288         arm7tdmi_clock_data_in(jtag_info, pc);
 289
 290         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 291         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 292         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 293         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 294         /* nothing fetched, data for LDR r0, [PC, #0] */
 295         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 296         /* nothing fetched, data from previous cycle is written to register */
 297         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 298
 299         /* fetch BX */
 300         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 301         /* NOP fetched, BX in Decode, MOV in Execute */
 302         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 303         /* NOP fetched, BX in Execute (1) */
 304         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 305
 306         jtag_execute_queue();
 307
 308         /* fix program counter:
 309          * MOV r0, r15 was the 4th instruction (+6)
 310          * reading PC in Thumb state gives address of instruction + 4
 311          */
 312         *pc -= 0xa;
 313 }
 314
 315
 316 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
 317  * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
 318  *
 319  * The solution is to arrange for a large out/in scan in this loop and
 320  * and convert data afterwards.
 321  */
 322 static void arm7tdmi_read_core_regs(struct target *target,
 323                 uint32_t mask, uint32_t* core_regs[16])
 324 {
 325         int i;
 326         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 327         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 328
 329         /* STMIA r0-15, [r0] at debug speed
 330          * register values will start to appear on 4th DCLK
 331          */
 332         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 333
 334         /* fetch NOP, STM in DECODE stage */
 335         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 336         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 337         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 338
 339         for (i = 0; i <= 15; i++)
 340         {
 341                 if (mask & (1 << i))
 342                         /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
 343                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 344         }
 345 }
 346
 347 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
 348                 uint32_t mask, void* buffer, int size)
 349 {
 350         int i;
 351         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 352         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 353         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 354         uint32_t *buf_u32 = buffer;
 355         uint16_t *buf_u16 = buffer;
 356         uint8_t *buf_u8 = buffer;
 357
 358         /* STMIA r0-15, [r0] at debug speed
 359          * register values will start to appear on 4th DCLK
 360          */
 361         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 362
 363         /* fetch NOP, STM in DECODE stage */
 364         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 365         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 366         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 367
 368         for (i = 0; i <= 15; i++)
 369         {
 370                 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
 371                 if (mask & (1 << i))
 372                 {
 373                         switch (size)
 374                         {
 375                                 case 4:
 376                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 377                                         break;
 378                                 case 2:
 379                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 380                                         break;
 381                                 case 1:
 382                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 383                                         break;
 384                         }
 385                 }
 386         }
 387 }
 388
 389 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
 390 {
 391         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 392         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 393
 394         /* MRS r0, cpsr */
 395         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 396
 397         /* STR r0, [r15] */
 398         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 399         /* fetch NOP, STR in DECODE stage */
 400         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 401         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 402         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 403         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 404         arm7tdmi_clock_data_in(jtag_info, xpsr);
 405 }
 406
 407 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
 408 {
 409         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 410         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 411
 412         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 413
 414         /* MSR1 fetched */
 415         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 416         /* MSR2 fetched, MSR1 in DECODE */
 417         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 418         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 419         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 420         /* nothing fetched, MSR1 in EXECUTE (2) */
 421         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 422         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 423         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 424         /* nothing fetched, MSR2 in EXECUTE (2) */
 425         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 426         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 427         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 428         /* nothing fetched, MSR3 in EXECUTE (2) */
 429         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 430         /* NOP fetched, MSR4 in EXECUTE (1) */
 431         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 432         /* nothing fetched, MSR4 in EXECUTE (2) */
 433         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 434 }
 435
 436 static void arm7tdmi_write_xpsr_im8(struct target *target,
 437                 uint8_t xpsr_im, int rot, int spsr)
 438 {
 439         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 440         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 441
 442         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 443
 444         /* MSR fetched */
 445         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 446         /* NOP fetched, MSR in DECODE */
 447         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 448         /* NOP fetched, MSR in EXECUTE (1) */
 449         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 450         /* nothing fetched, MSR in EXECUTE (2) */
 451         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 452 }
 453
 454 static void arm7tdmi_write_core_regs(struct target *target,
 455                 uint32_t mask, uint32_t core_regs[16])
 456 {
 457         int i;
 458         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 459         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 460
 461         /* LDMIA r0-15, [r0] at debug speed
 462         * register values will start to appear on 4th DCLK
 463         */
 464         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 465
 466         /* fetch NOP, LDM in DECODE stage */
 467         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 468         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 469         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 470
 471         for (i = 0; i <= 15; i++)
 472         {
 473                 if (mask & (1 << i))
 474                         /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
 475                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 476         }
 477         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 478 }
 479
 480 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
 481 {
 482         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 483         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 484
 485         /* put system-speed load-multiple into the pipeline */
 486         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 487         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 488         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 489 }
 490
 491 static void arm7tdmi_load_hword_reg(struct target *target, int num)
 492 {
 493         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 494         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 495
 496         /* put system-speed load half-word into the pipeline */
 497         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 498         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 499         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 500 }
 501
 502 static void arm7tdmi_load_byte_reg(struct target *target, int num)
 503 {
 504         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 505         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 506
 507         /* put system-speed load byte into the pipeline */
 508         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 509         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 510         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 511 }
 512
 513 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
 514 {
 515         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 516         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 517
 518         /* put system-speed store-multiple into the pipeline */
 519         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 520         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 521         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 522 }
 523
 524 static void arm7tdmi_store_hword_reg(struct target *target, int num)
 525 {
 526         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 527         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 528
 529         /* put system-speed store half-word into the pipeline */
 530         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 531         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 532         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 533 }
 534
 535 static void arm7tdmi_store_byte_reg(struct target *target, int num)
 536 {
 537         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 538         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 539
 540         /* put system-speed store byte into the pipeline */
 541         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 542         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 543         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 544 }
 545
 546 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
 547 {
 548         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 549         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 550
 551         /* LDMIA r0-15, [r0] at debug speed
 552          * register values will start to appear on 4th DCLK
 553          */
 554         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 555         /* fetch NOP, LDM in DECODE stage */
 556         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 557         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 558         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 559         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 560         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 561         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 562         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 563         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 564         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 565         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 566         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 567         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 568         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 569 }
 570
 571 static void arm7tdmi_branch_resume(struct target *target)
 572 {
 573         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 574         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 575
 576         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 577         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 578 }
 579
 580 static void arm7tdmi_branch_resume_thumb(struct target *target)
 581 {
 582         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 583         struct armv4_5_common_s *armv4_5 = &arm7_9->armv4_5_common;
 584         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 585         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 586
 587         LOG_DEBUG("-");
 588
 589         /* LDMIA r0, [r0] at debug speed
 590          * register values will start to appear on 4th DCLK
 591          */
 592         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 593
 594         /* fetch NOP, LDM in DECODE stage */
 595         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 596         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 597         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 598         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 599         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
 600         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 601         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 602
 603         /* Branch and eXchange */
 604         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 605
 606         embeddedice_read_reg(dbg_stat);
 607
 608         /* fetch NOP, BX in DECODE stage */
 609         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 610
 611         /* target is now in Thumb state */
 612         embeddedice_read_reg(dbg_stat);
 613
 614         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 615         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 616
 617         /* target is now in Thumb state */
 618         embeddedice_read_reg(dbg_stat);
 619
 620         /* load r0 value */
 621         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 622         /* fetch NOP, LDR in Decode */
 623         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 624         /* fetch NOP, LDR in Execute */
 625         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 626         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 627         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 628         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 629         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 630
 631         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 632         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 633
 634         embeddedice_read_reg(dbg_stat);
 635
 636         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 637         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 638 }
 639
 640 static void arm7tdmi_build_reg_cache(struct target *target)
 641 {
 642         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 643         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 644
 645         (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
 646         armv4_5->core_cache = (*cache_p);
 647 }
 648
 649 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
 650 {
 651         arm7tdmi_build_reg_cache(target);
 652
 653         return ERROR_OK;
 654 }
 655
 656 int arm7tdmi_init_arch_info(struct target *target, struct arm7tdmi_common *arm7tdmi, struct jtag_tap *tap)
 657 {
 658         struct arm7_9_common *arm7_9 = &arm7tdmi->arm7_9_common;
 659
 660         /* prepare JTAG information for the new target */
 661         arm7_9->jtag_info.tap = tap;
 662         arm7_9->jtag_info.scann_size = 4;
 663
 664         /* register arch-specific functions */
 665         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 666         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 667         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 668         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 669         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 670
 671         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 672         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 673         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 674
 675         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 676         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 677         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 678
 679         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 680         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 681         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 682
 683         arm7_9->write_pc = arm7tdmi_write_pc;
 684         arm7_9->branch_resume = arm7tdmi_branch_resume;
 685         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 686
 687         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 688         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 689
 690         arm7_9->post_debug_entry = NULL;
 691
 692         arm7_9->pre_restore_context = NULL;
 693         arm7_9->post_restore_context = NULL;
 694
 695         /* initialize arch-specific breakpoint handling */
 696         arm7_9->arm_bkpt = 0xdeeedeee;
 697         arm7_9->thumb_bkpt = 0xdeee;
 698
 699         arm7_9->dbgreq_adjust_pc = 2;
 700
 701         arm7_9_init_arch_info(target, arm7_9);
 702
 703         return ERROR_OK;
 704 }
 705
 706 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
 707 {
 708         struct arm7tdmi_common *arm7tdmi;
 709
 710         arm7tdmi = calloc(1,sizeof(struct arm7tdmi_common));
 711         arm7tdmi_init_arch_info(target, arm7tdmi, target->tap);
 712         arm7tdmi->arm7_9_common.armv4_5_common.is_armv4 = true;
 713
 714         return ERROR_OK;
 715 }
 716
 717 /** Holds methods for ARM7TDMI targets. */
 718 struct target_type arm7tdmi_target =
 719 {
 720         .name = "arm7tdmi",
 721
 722         .poll = arm7_9_poll,
 723         .arch_state = armv4_5_arch_state,
 724
 725         .target_request_data = arm7_9_target_request_data,
 726
 727         .halt = arm7_9_halt,
 728         .resume = arm7_9_resume,
 729         .step = arm7_9_step,
 730
 731         .assert_reset = arm7_9_assert_reset,
 732         .deassert_reset = arm7_9_deassert_reset,
 733         .soft_reset_halt = arm7_9_soft_reset_halt,
 734
 735         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
 736
 737         .read_memory = arm7_9_read_memory,
 738         .write_memory = arm7_9_write_memory,
 739         .bulk_write_memory = arm7_9_bulk_write_memory,
 740         .checksum_memory = arm7_9_checksum_memory,
 741         .blank_check_memory = arm7_9_blank_check_memory,
 742
 743         .run_algorithm = armv4_5_run_algorithm,
 744
 745         .add_breakpoint = arm7_9_add_breakpoint,
 746         .remove_breakpoint = arm7_9_remove_breakpoint,
 747         .add_watchpoint = arm7_9_add_watchpoint,
 748         .remove_watchpoint = arm7_9_remove_watchpoint,
 749
 750         .register_commands  = arm7_9_register_commands,
 751         .target_create  = arm7tdmi_target_create,
 752         .init_target = arm7tdmi_init_target,
 753         .examine = arm7_9_examine,
 754 };