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 #include "register.h"
  33 #include "arm_opcodes.h"
  34
  35
  36 /*
  37  * For information about ARM7TDMI, see ARM DDI 0210C (r4p1)
  38  * or ARM DDI 0029G (r3).  "Debug In Depth", Appendix B,
  39  * covers JTAG support.
  40  */
  41
  42 #if 0
  43 #define _DEBUG_INSTRUCTION_EXECUTION_
  44 #endif
  45
  46 static int arm7tdmi_examine_debug_reason(struct target *target)
  47 {
  48         int retval = ERROR_OK;
  49         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  50
  51         /* only check the debug reason if we don't know it already */
  52         if ((target->debug_reason != DBG_REASON_DBGRQ)
  53                         && (target->debug_reason != DBG_REASON_SINGLESTEP))
  54         {
  55                 struct scan_field fields[2];
  56                 uint8_t databus[4];
  57                 uint8_t breakpoint;
  58
  59                 fields[0].num_bits = 1;
  60                 fields[0].out_value = NULL;
  61                 fields[0].in_value = &breakpoint;
  62
  63                 fields[1].num_bits = 32;
  64                 fields[1].out_value = NULL;
  65                 fields[1].in_value = databus;
  66
  67                 if ((retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1, TAP_DRPAUSE)) != ERROR_OK)
  68                 {
  69                         return retval;
  70                 }
  71                 retval = arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL, TAP_DRPAUSE);
  72                 if (retval != ERROR_OK)
  73                         return retval;
  74
  75                 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, 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(arm7_9->jtag_info.tap, 2, fields, 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                         TAP_DRPAUSE);
 108
 109         jtag_add_runtest(0, TAP_DRPAUSE);
 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         int retval;
 123         retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
 124         if (retval != ERROR_OK)
 125                 return retval;
 126         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 127         if (retval != ERROR_OK)
 128                 return retval;
 129
 130         return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
 131 }
 132
 133 /* clock the target, reading the databus */
 134 static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in)
 135 {
 136         int retval = ERROR_OK;
 137         struct scan_field fields[2];
 138
 139         if ((retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE)) != ERROR_OK)
 140         {
 141                 return retval;
 142         }
 143         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 144         if (retval != ERROR_OK)
 145                 return retval;
 146
 147         fields[0].num_bits = 1;
 148         fields[0].out_value = NULL;
 149         fields[0].in_value = NULL;
 150
 151         fields[1].num_bits = 32;
 152         fields[1].out_value = NULL;
 153         fields[1].in_value = (uint8_t *)in;
 154
 155         jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
 156
 157         jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
 158
 159         jtag_add_runtest(0, TAP_DRPAUSE);
 160
 161 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 162         if ((retval = jtag_execute_queue()) != ERROR_OK)
 163                 return retval;
 164
 165         if (in)
 166                 LOG_DEBUG("in: 0x%8.8x", *in);
 167         else
 168                 LOG_ERROR("BUG: called with in == NULL");
 169 #endif
 170
 171         return ERROR_OK;
 172 }
 173
 174 void arm_endianness(uint8_t *tmp, void *in, int size, int be, int flip)
 175 {
 176         uint32_t readback = le_to_h_u32(tmp);
 177         if (flip)
 178                 readback = flip_u32(readback, 32);
 179         switch (size)
 180         {
 181                 case 4:
 182                         if (be)
 183                         {
 184                                 h_u32_to_be(((uint8_t*)in), readback);
 185                         } else
 186                         {
 187                                  h_u32_to_le(((uint8_t*)in), readback);
 188                         }
 189                         break;
 190                 case 2:
 191                         if (be)
 192                         {
 193                                 h_u16_to_be(((uint8_t*)in), readback & 0xffff);
 194                         } else
 195                         {
 196                                 h_u16_to_le(((uint8_t*)in), readback & 0xffff);
 197                         }
 198                         break;
 199                 case 1:
 200                         *((uint8_t *)in)= readback & 0xff;
 201                         break;
 202         }
 203 }
 204
 205 static int arm7endianness(jtag_callback_data_t arg,
 206         jtag_callback_data_t size, jtag_callback_data_t be,
 207         jtag_callback_data_t captured)
 208 {
 209         uint8_t *in = (uint8_t *)arg;
 210
 211         arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1);
 212         return ERROR_OK;
 213 }
 214
 215 /* clock the target, and read the databus
 216  * the *in pointer points to a buffer where elements of 'size' bytes
 217  * are stored in big (be == 1) or little (be == 0) endianness
 218  */
 219 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
 220                 void *in, int size, int be)
 221 {
 222         int retval = ERROR_OK;
 223         struct scan_field fields[2];
 224
 225         if ((retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE)) != ERROR_OK)
 226         {
 227                 return retval;
 228         }
 229         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 230         if (retval != ERROR_OK)
 231                 return retval;
 232
 233         fields[0].num_bits = 1;
 234         fields[0].out_value = NULL;
 235         fields[0].in_value = NULL;
 236
 237         fields[1].num_bits = 32;
 238         fields[1].out_value = NULL;
 239         fields[1].in_value = in;
 240
 241         jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
 242
 243         jtag_add_callback4(arm7endianness,
 244                 (jtag_callback_data_t)in,
 245                 (jtag_callback_data_t)size,
 246                 (jtag_callback_data_t)be,
 247                 (jtag_callback_data_t)in);
 248
 249         jtag_add_runtest(0, TAP_DRPAUSE);
 250
 251 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 252 {
 253                 if ((retval = jtag_execute_queue()) != ERROR_OK)
 254                 {
 255                         return retval;
 256                 }
 257
 258                 if (in)
 259                 {
 260                         LOG_DEBUG("in: 0x%8.8x", *(uint32_t*)in);
 261                 }
 262                 else
 263                 {
 264                         LOG_ERROR("BUG: called with in == NULL");
 265                 }
 266 }
 267 #endif
 268
 269         return ERROR_OK;
 270 }
 271
 272 static void arm7tdmi_change_to_arm(struct target *target,
 273                 uint32_t *r0, uint32_t *pc)
 274 {
 275         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 276         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 277
 278         /* save r0 before using it and put system in ARM state
 279          * to allow common handling of ARM and THUMB debugging */
 280
 281         /* fetch STR r0, [r0] */
 282         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 283         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 284         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 285         /* nothing fetched, STR r0, [r0] in Execute (2) */
 286         arm7tdmi_clock_data_in(jtag_info, r0);
 287
 288         /* MOV r0, r15 fetched, STR in Decode */
 289         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 290         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 291         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 292         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 293         /* nothing fetched, STR r0, [r0] in Execute (2) */
 294         arm7tdmi_clock_data_in(jtag_info, pc);
 295
 296         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 297         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 298         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 299         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 300         /* nothing fetched, data for LDR r0, [PC, #0] */
 301         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 302         /* nothing fetched, data from previous cycle is written to register */
 303         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 304
 305         /* fetch BX */
 306         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 307         /* NOP fetched, BX in Decode, MOV in Execute */
 308         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 309         /* NOP fetched, BX in Execute (1) */
 310         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 311
 312         jtag_execute_queue();
 313
 314         /* fix program counter:
 315          * MOV r0, r15 was the 4th instruction (+6)
 316          * reading PC in Thumb state gives address of instruction + 4
 317          */
 318         *pc -= 0xa;
 319 }
 320
 321
 322 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
 323  * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
 324  *
 325  * The solution is to arrange for a large out/in scan in this loop and
 326  * and convert data afterwards.
 327  */
 328 static void arm7tdmi_read_core_regs(struct target *target,
 329                 uint32_t mask, uint32_t* core_regs[16])
 330 {
 331         int i;
 332         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 333         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 334
 335         /* STMIA r0-15, [r0] at debug speed
 336          * register values will start to appear on 4th DCLK
 337          */
 338         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 339
 340         /* fetch NOP, STM in DECODE stage */
 341         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 342         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 343         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 344
 345         for (i = 0; i <= 15; i++)
 346         {
 347                 if (mask & (1 << i))
 348                         /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
 349                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 350         }
 351 }
 352
 353 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
 354                 uint32_t mask, void* buffer, int size)
 355 {
 356         int i;
 357         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 358         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 359         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 360         uint32_t *buf_u32 = buffer;
 361         uint16_t *buf_u16 = buffer;
 362         uint8_t *buf_u8 = buffer;
 363
 364         /* STMIA r0-15, [r0] at debug speed
 365          * register values will start to appear on 4th DCLK
 366          */
 367         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 368
 369         /* fetch NOP, STM in DECODE stage */
 370         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 371         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 372         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 373
 374         for (i = 0; i <= 15; i++)
 375         {
 376                 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
 377                 if (mask & (1 << i))
 378                 {
 379                         switch (size)
 380                         {
 381                                 case 4:
 382                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 383                                         break;
 384                                 case 2:
 385                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 386                                         break;
 387                                 case 1:
 388                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 389                                         break;
 390                         }
 391                 }
 392         }
 393 }
 394
 395 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
 396 {
 397         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 398         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 399
 400         /* MRS r0, cpsr */
 401         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 402
 403         /* STR r0, [r15] */
 404         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 405         /* fetch NOP, STR in DECODE stage */
 406         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 407         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 408         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 409         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 410         arm7tdmi_clock_data_in(jtag_info, xpsr);
 411 }
 412
 413 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
 414 {
 415         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 416         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 417
 418         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 419
 420         /* MSR1 fetched */
 421         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 422         /* MSR2 fetched, MSR1 in DECODE */
 423         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 424         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 425         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 426         /* nothing fetched, MSR1 in EXECUTE (2) */
 427         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 428         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 429         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 430         /* nothing fetched, MSR2 in EXECUTE (2) */
 431         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 432         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 433         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 434         /* nothing fetched, MSR3 in EXECUTE (2) */
 435         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 436         /* NOP fetched, MSR4 in EXECUTE (1) */
 437         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 438         /* nothing fetched, MSR4 in EXECUTE (2) */
 439         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 440 }
 441
 442 static void arm7tdmi_write_xpsr_im8(struct target *target,
 443                 uint8_t xpsr_im, int rot, int spsr)
 444 {
 445         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 446         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 447
 448         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 449
 450         /* MSR fetched */
 451         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 452         /* NOP fetched, MSR in DECODE */
 453         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 454         /* NOP fetched, MSR in EXECUTE (1) */
 455         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 456         /* nothing fetched, MSR in EXECUTE (2) */
 457         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 458 }
 459
 460 static void arm7tdmi_write_core_regs(struct target *target,
 461                 uint32_t mask, uint32_t core_regs[16])
 462 {
 463         int i;
 464         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 465         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 466
 467         /* LDMIA r0-15, [r0] at debug speed
 468         * register values will start to appear on 4th DCLK
 469         */
 470         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 471
 472         /* fetch NOP, LDM in DECODE stage */
 473         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 474         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 475         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 476
 477         for (i = 0; i <= 15; i++)
 478         {
 479                 if (mask & (1 << i))
 480                         /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
 481                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 482         }
 483         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 484 }
 485
 486 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
 487 {
 488         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 489         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 490
 491         /* put system-speed load-multiple into the pipeline */
 492         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 493         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 494         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 495 }
 496
 497 static void arm7tdmi_load_hword_reg(struct target *target, int num)
 498 {
 499         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 500         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 501
 502         /* put system-speed load half-word into the pipeline */
 503         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 504         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 505         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 506 }
 507
 508 static void arm7tdmi_load_byte_reg(struct target *target, int num)
 509 {
 510         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 511         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 512
 513         /* put system-speed load byte into the pipeline */
 514         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 515         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 516         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 517 }
 518
 519 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
 520 {
 521         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 522         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 523
 524         /* put system-speed store-multiple into the pipeline */
 525         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 526         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 527         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 528 }
 529
 530 static void arm7tdmi_store_hword_reg(struct target *target, int num)
 531 {
 532         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 533         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 534
 535         /* put system-speed store half-word into the pipeline */
 536         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 537         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
 539 }
 540
 541 static void arm7tdmi_store_byte_reg(struct target *target, int num)
 542 {
 543         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 544         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 545
 546         /* put system-speed store byte into the pipeline */
 547         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 548         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 549         arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
 550 }
 551
 552 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
 553 {
 554         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 555         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 556
 557         /* LDMIA r0-15, [r0] at debug speed
 558          * register values will start to appear on 4th DCLK
 559          */
 560         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 561         /* fetch NOP, LDM in DECODE stage */
 562         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 563         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 564         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 565         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 566         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 567         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 568         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 569         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 570         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 571         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 572         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 573         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 574         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 575 }
 576
 577 static void arm7tdmi_branch_resume(struct target *target)
 578 {
 579         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 580         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 581
 582         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 583         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 584 }
 585
 586 static void arm7tdmi_branch_resume_thumb(struct target *target)
 587 {
 588         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 589         struct arm *armv4_5 = &arm7_9->armv4_5_common;
 590         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 591         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 592
 593         LOG_DEBUG("-");
 594
 595         /* LDMIA r0, [r0] at debug speed
 596          * register values will start to appear on 4th DCLK
 597          */
 598         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 599
 600         /* fetch NOP, LDM in DECODE stage */
 601         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 602         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 603         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 604         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 605         arm7tdmi_clock_out(jtag_info,
 606                         buf_get_u32(armv4_5->pc->value, 0, 32) | 1, NULL, 0);
 607         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 608         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 609
 610         /* Branch and eXchange */
 611         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 612
 613         embeddedice_read_reg(dbg_stat);
 614
 615         /* fetch NOP, BX in DECODE stage */
 616         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 617
 618         /* target is now in Thumb state */
 619         embeddedice_read_reg(dbg_stat);
 620
 621         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 622         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 623
 624         /* target is now in Thumb state */
 625         embeddedice_read_reg(dbg_stat);
 626
 627         /* load r0 value */
 628         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 629         /* fetch NOP, LDR in Decode */
 630         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 631         /* fetch NOP, LDR in Execute */
 632         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 633         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 634         arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 635         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 636         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 637
 638         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 639         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 640
 641         embeddedice_read_reg(dbg_stat);
 642
 643         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 644         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 645 }
 646
 647 static void arm7tdmi_build_reg_cache(struct target *target)
 648 {
 649         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 650         struct arm *armv4_5 = target_to_arm(target);
 651
 652         (*cache_p) = arm_build_reg_cache(target, armv4_5);
 653 }
 654
 655 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
 656 {
 657         arm7tdmi_build_reg_cache(target);
 658
 659         return ERROR_OK;
 660 }
 661
 662 int arm7tdmi_init_arch_info(struct target *target,
 663                 struct arm7_9_common *arm7_9, struct jtag_tap *tap)
 664 {
 665         /* prepare JTAG information for the new target */
 666         arm7_9->jtag_info.tap = tap;
 667         arm7_9->jtag_info.scann_size = 4;
 668
 669         /* register arch-specific functions */
 670         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 671         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 672         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 673         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 674         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 675
 676         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 677         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 678         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 679
 680         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 681         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 682         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 683
 684         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 685         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 686         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 687
 688         arm7_9->write_pc = arm7tdmi_write_pc;
 689         arm7_9->branch_resume = arm7tdmi_branch_resume;
 690         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 691
 692         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 693         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 694
 695         arm7_9->post_debug_entry = NULL;
 696
 697         arm7_9->pre_restore_context = NULL;
 698
 699         /* initialize arch-specific breakpoint handling */
 700         arm7_9->arm_bkpt = 0xdeeedeee;
 701         arm7_9->thumb_bkpt = 0xdeee;
 702
 703         arm7_9->dbgreq_adjust_pc = 2;
 704
 705         arm7_9_init_arch_info(target, arm7_9);
 706
 707         return ERROR_OK;
 708 }
 709
 710 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
 711 {
 712         struct arm7_9_common *arm7_9;
 713
 714         arm7_9 = calloc(1,sizeof(struct arm7_9_common));
 715         arm7tdmi_init_arch_info(target, arm7_9, target->tap);
 716         arm7_9->armv4_5_common.is_armv4 = true;
 717
 718         return ERROR_OK;
 719 }
 720
 721 /** Holds methods for ARM7TDMI targets. */
 722 struct target_type arm7tdmi_target =
 723 {
 724         .name = "arm7tdmi",
 725
 726         .poll = arm7_9_poll,
 727         .arch_state = arm_arch_state,
 728
 729         .target_request_data = arm7_9_target_request_data,
 730
 731         .halt = arm7_9_halt,
 732         .resume = arm7_9_resume,
 733         .step = arm7_9_step,
 734
 735         .assert_reset = arm7_9_assert_reset,
 736         .deassert_reset = arm7_9_deassert_reset,
 737         .soft_reset_halt = arm7_9_soft_reset_halt,
 738
 739         .get_gdb_reg_list = arm_get_gdb_reg_list,
 740
 741         .read_memory = arm7_9_read_memory,
 742         .write_memory = arm7_9_write_memory,
 743         .bulk_write_memory = arm7_9_bulk_write_memory,
 744
 745         .checksum_memory = arm_checksum_memory,
 746         .blank_check_memory = arm_blank_check_memory,
 747
 748         .run_algorithm = armv4_5_run_algorithm,
 749
 750         .add_breakpoint = arm7_9_add_breakpoint,
 751         .remove_breakpoint = arm7_9_remove_breakpoint,
 752         .add_watchpoint = arm7_9_add_watchpoint,
 753         .remove_watchpoint = arm7_9_remove_watchpoint,
 754
 755         .commands  = arm7_9_command_handlers,
 756         .target_create  = arm7tdmi_target_create,
 757         .init_target = arm7tdmi_init_target,
 758         .examine = arm7_9_examine,
 759         .check_reset = arm7_9_check_reset,
 760 };