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  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  25  ***************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "arm7tdmi.h"
  32 #include "target_type.h"
  33 #include "register.h"
  34 #include "arm_opcodes.h"
  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                 struct scan_field fields[2];
  55                 uint8_t databus[4];
  56                 uint8_t breakpoint;
  57
  58                 fields[0].num_bits = 1;
  59                 fields[0].out_value = NULL;
  60                 fields[0].in_value = &breakpoint;
  61
  62                 fields[1].num_bits = 32;
  63                 fields[1].out_value = NULL;
  64                 fields[1].in_value = databus;
  65
  66                 retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1, TAP_DRPAUSE);
  67                 if (retval != ERROR_OK)
  68                         return retval;
  69                 retval = arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL, TAP_DRPAUSE);
  70                 if (retval != ERROR_OK)
  71                         return retval;
  72
  73                 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
  74                 retval = jtag_execute_queue();
  75                 if (retval != ERROR_OK)
  76                         return retval;
  77
  78                 fields[0].in_value = NULL;
  79                 fields[0].out_value = &breakpoint;
  80                 fields[1].in_value = NULL;
  81                 fields[1].out_value = databus;
  82
  83                 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
  84
  85                 if (breakpoint & 1)
  86                         target->debug_reason = DBG_REASON_WATCHPOINT;
  87                 else
  88                         target->debug_reason = DBG_REASON_BREAKPOINT;
  89         }
  90
  91         return ERROR_OK;
  92 }
  93
  94 static const int arm7tdmi_num_bits[] = {1, 32};
  95
  96 static inline int arm7tdmi_clock_out_inner(struct arm_jtag *jtag_info, uint32_t out, int breakpoint)
  97 {
  98         uint32_t values[2] = {breakpoint, flip_u32(out, 32)};
  99
 100         jtag_add_dr_out(jtag_info->tap,
 101                         2,
 102                         arm7tdmi_num_bits,
 103                         values,
 104                         TAP_DRPAUSE);
 105
 106         jtag_add_runtest(0, TAP_DRPAUSE);
 107
 108         return ERROR_OK;
 109 }
 110
 111 /* put an instruction in the ARM7TDMI pipeline or write the data bus,
 112  * and optionally read data
 113  *
 114  * FIXME remove the unused "deprecated" parameter
 115  */
 116 static inline int arm7tdmi_clock_out(struct arm_jtag *jtag_info,
 117                 uint32_t out, uint32_t *deprecated, int breakpoint)
 118 {
 119         int retval;
 120         retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
 121         if (retval != ERROR_OK)
 122                 return retval;
 123         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 124         if (retval != ERROR_OK)
 125                 return retval;
 126
 127         return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
 128 }
 129
 130 /* clock the target, reading the databus */
 131 static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in)
 132 {
 133         int retval = ERROR_OK;
 134         struct scan_field fields[2];
 135
 136         retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
 137         if (retval != ERROR_OK)
 138                 return retval;
 139         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 140         if (retval != ERROR_OK)
 141                 return retval;
 142
 143         fields[0].num_bits = 1;
 144         fields[0].out_value = NULL;
 145         fields[0].in_value = NULL;
 146
 147         fields[1].num_bits = 32;
 148         fields[1].out_value = NULL;
 149         fields[1].in_value = (uint8_t *)in;
 150
 151         jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
 152
 153         jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
 154
 155         jtag_add_runtest(0, TAP_DRPAUSE);
 156
 157 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 158         retval = jtag_execute_queue();
 159         if (retval != 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 /* clock the target, and read the databus
 172  * the *in pointer points to a buffer where elements of 'size' bytes
 173  * are stored in big (be == 1) or little (be == 0) endianness
 174  */
 175 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
 176                 void *in, int size, int be)
 177 {
 178         int retval = ERROR_OK;
 179         struct scan_field fields[3];
 180
 181         retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
 182         if (retval != ERROR_OK)
 183                 return retval;
 184         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 185         if (retval != ERROR_OK)
 186                 return retval;
 187
 188         fields[0].num_bits = 1;
 189         fields[0].out_value = NULL;
 190         fields[0].in_value = NULL;
 191
 192         if (size == 4) {
 193                 fields[1].num_bits = 32;
 194                 fields[1].out_value = NULL;
 195                 fields[1].in_value = in;
 196         } else {
 197                 /* Discard irrelevant bits of the scan, making sure we don't write more
 198                  * than size bytes to in */
 199                 fields[1].num_bits = 32 - size * 8;
 200                 fields[1].out_value = NULL;
 201                 fields[1].in_value = NULL;
 202
 203                 fields[2].num_bits = size * 8;
 204                 fields[2].out_value = NULL;
 205                 fields[2].in_value = in;
 206         }
 207
 208         jtag_add_dr_scan(jtag_info->tap, size == 4 ? 2 : 3, fields, TAP_DRPAUSE);
 209
 210         jtag_add_callback4(arm7_9_endianness_callback,
 211                 (jtag_callback_data_t)in,
 212                 (jtag_callback_data_t)size,
 213                 (jtag_callback_data_t)be,
 214                 (jtag_callback_data_t)1);
 215
 216         jtag_add_runtest(0, TAP_DRPAUSE);
 217
 218 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 219 {
 220                 retval = jtag_execute_queue();
 221                 if (retval != ERROR_OK)
 222                         return retval;
 223
 224                 if (in)
 225                         LOG_DEBUG("in: 0x%8.8x", *(uint32_t *)in);
 226                 else
 227                         LOG_ERROR("BUG: called with in == NULL");
 228 }
 229 #endif
 230
 231         return ERROR_OK;
 232 }
 233
 234 static void arm7tdmi_change_to_arm(struct target *target,
 235                 uint32_t *r0, uint32_t *pc)
 236 {
 237         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 238         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 239
 240         /* save r0 before using it and put system in ARM state
 241          * to allow common handling of ARM and THUMB debugging */
 242
 243         /* fetch STR r0, [r0] */
 244         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 245         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 246         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 247         /* nothing fetched, STR r0, [r0] in Execute (2) */
 248         arm7tdmi_clock_data_in(jtag_info, r0);
 249
 250         /* MOV r0, r15 fetched, STR in Decode */
 251         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 252         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 253         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 254         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 255         /* nothing fetched, STR r0, [r0] in Execute (2) */
 256         arm7tdmi_clock_data_in(jtag_info, pc);
 257
 258         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 259         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 260         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 261         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 262         /* nothing fetched, data for LDR r0, [PC, #0] */
 263         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 264         /* nothing fetched, data from previous cycle is written to register */
 265         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 266
 267         /* fetch BX */
 268         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 269         /* NOP fetched, BX in Decode, MOV in Execute */
 270         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 271         /* NOP fetched, BX in Execute (1) */
 272         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 273
 274         jtag_execute_queue();
 275
 276         /* fix program counter:
 277          * MOV r0, r15 was the 4th instruction (+6)
 278          * reading PC in Thumb state gives address of instruction + 4
 279          */
 280         *pc -= 0xa;
 281 }
 282
 283 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
 284  * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
 285  *
 286  * The solution is to arrange for a large out/in scan in this loop and
 287  * and convert data afterwards.
 288  */
 289 static void arm7tdmi_read_core_regs(struct target *target,
 290                 uint32_t mask, uint32_t *core_regs[16])
 291 {
 292         int i;
 293         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 294         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 295
 296         /* STMIA r0-15, [r0] at debug speed
 297          * register values will start to appear on 4th DCLK
 298          */
 299         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 300
 301         /* fetch NOP, STM in DECODE stage */
 302         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 303         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 304         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 305
 306         for (i = 0; i <= 15; i++) {
 307                 if (mask & (1 << i))
 308                         /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
 309                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 310         }
 311 }
 312
 313 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
 314                 uint32_t mask, void *buffer, int size)
 315 {
 316         int i;
 317         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 318         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 319         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 320         uint32_t *buf_u32 = buffer;
 321         uint16_t *buf_u16 = buffer;
 322         uint8_t *buf_u8 = buffer;
 323
 324         /* STMIA r0-15, [r0] at debug speed
 325          * register values will start to appear on 4th DCLK
 326          */
 327         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 328
 329         /* fetch NOP, STM in DECODE stage */
 330         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 331         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 332         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 333
 334         for (i = 0; i <= 15; i++) {
 335                 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
 336                 if (mask & (1 << i)) {
 337                         switch (size) {
 338                                 case 4:
 339                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 340                                         break;
 341                                 case 2:
 342                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 343                                         break;
 344                                 case 1:
 345                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 346                                         break;
 347                         }
 348                 }
 349         }
 350 }
 351
 352 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
 353 {
 354         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 355         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 356
 357         /* MRS r0, cpsr */
 358         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 359
 360         /* STR r0, [r15] */
 361         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 362         /* fetch NOP, STR in DECODE stage */
 363         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 364         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 365         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 366         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 367         arm7tdmi_clock_data_in(jtag_info, xpsr);
 368 }
 369
 370 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
 371 {
 372         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 373         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 374
 375         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 376
 377         /* MSR1 fetched */
 378         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 379         /* MSR2 fetched, MSR1 in DECODE */
 380         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 381         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 382         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 383         /* nothing fetched, MSR1 in EXECUTE (2) */
 384         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 385         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 386         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 387         /* nothing fetched, MSR2 in EXECUTE (2) */
 388         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 389         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 390         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 391         /* nothing fetched, MSR3 in EXECUTE (2) */
 392         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 393         /* NOP fetched, MSR4 in EXECUTE (1) */
 394         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 395         /* nothing fetched, MSR4 in EXECUTE (2) */
 396         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 397 }
 398
 399 static void arm7tdmi_write_xpsr_im8(struct target *target,
 400                 uint8_t xpsr_im, int rot, int spsr)
 401 {
 402         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 403         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 404
 405         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 406
 407         /* MSR fetched */
 408         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 409         /* NOP fetched, MSR in DECODE */
 410         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 411         /* NOP fetched, MSR in EXECUTE (1) */
 412         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 413         /* nothing fetched, MSR in EXECUTE (2) */
 414         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 415 }
 416
 417 static void arm7tdmi_write_core_regs(struct target *target,
 418                 uint32_t mask, uint32_t core_regs[16])
 419 {
 420         int i;
 421         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 422         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 423
 424         /* LDMIA r0-15, [r0] at debug speed
 425         * register values will start to appear on 4th DCLK
 426         */
 427         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 428
 429         /* fetch NOP, LDM in DECODE stage */
 430         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 431         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 432         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 433
 434         for (i = 0; i <= 15; i++) {
 435                 if (mask & (1 << i))
 436                         /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
 437                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 438         }
 439         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 440 }
 441
 442 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
 443 {
 444         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 445         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 446
 447         /* put system-speed load-multiple into the pipeline */
 448         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 449         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 450         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 451 }
 452
 453 static void arm7tdmi_load_hword_reg(struct target *target, int num)
 454 {
 455         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 456         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 457
 458         /* put system-speed load half-word into the pipeline */
 459         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 460         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 461         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
 462 }
 463
 464 static void arm7tdmi_load_byte_reg(struct target *target, int num)
 465 {
 466         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 467         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 468
 469         /* put system-speed load byte into the pipeline */
 470         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 471         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 472         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
 473 }
 474
 475 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
 476 {
 477         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 478         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 479
 480         /* put system-speed store-multiple into the pipeline */
 481         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 482         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 483         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
 484 }
 485
 486 static void arm7tdmi_store_hword_reg(struct target *target, int num)
 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 store half-word 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_STRH_IP(num, 0), NULL, 0);
 495 }
 496
 497 static void arm7tdmi_store_byte_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 store byte 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_STRB_IP(num, 0), NULL, 0);
 506 }
 507
 508 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
 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         /* LDMIA r0-15, [r0] at debug speed
 514          * register values will start to appear on 4th DCLK
 515          */
 516         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 517         /* fetch NOP, LDM in DECODE stage */
 518         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 519         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 520         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 521         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 522         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 523         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 524         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 525         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 526         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 527         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 528         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 529         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 530         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 531 }
 532
 533 static void arm7tdmi_branch_resume(struct target *target)
 534 {
 535         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 536         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 537
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 539         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 540 }
 541
 542 static void arm7tdmi_branch_resume_thumb(struct target *target)
 543 {
 544         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 545         struct arm *arm = &arm7_9->arm;
 546         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 547         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 548
 549         LOG_DEBUG("-");
 550
 551         /* LDMIA r0, [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, 0x1, 0, 0), NULL, 0);
 555
 556         /* fetch NOP, LDM in DECODE stage */
 557         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 558         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 559         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 560         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 561         arm7tdmi_clock_out(jtag_info,
 562                         buf_get_u32(arm->pc->value, 0, 32) | 1, NULL, 0);
 563         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 564         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 565
 566         /* Branch and eXchange */
 567         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 568
 569         embeddedice_read_reg(dbg_stat);
 570
 571         /* fetch NOP, BX in DECODE stage */
 572         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 573
 574         /* target is now in Thumb state */
 575         embeddedice_read_reg(dbg_stat);
 576
 577         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 578         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 579
 580         /* target is now in Thumb state */
 581         embeddedice_read_reg(dbg_stat);
 582
 583         /* load r0 value */
 584         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 585         /* fetch NOP, LDR in Decode */
 586         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 587         /* fetch NOP, LDR in Execute */
 588         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 589         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 590         arm7tdmi_clock_out(jtag_info, buf_get_u32(arm->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 591         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 592         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 593
 594         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 595         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 596
 597         embeddedice_read_reg(dbg_stat);
 598
 599         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 600         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 601 }
 602
 603 static void arm7tdmi_build_reg_cache(struct target *target)
 604 {
 605         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 606         struct arm *arm = target_to_arm(target);
 607
 608         (*cache_p) = arm_build_reg_cache(target, arm);
 609 }
 610
 611 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
 612 {
 613         arm7tdmi_build_reg_cache(target);
 614
 615         return ERROR_OK;
 616 }
 617
 618 int arm7tdmi_init_arch_info(struct target *target,
 619                 struct arm7_9_common *arm7_9, struct jtag_tap *tap)
 620 {
 621         /* prepare JTAG information for the new target */
 622         arm7_9->jtag_info.tap = tap;
 623         arm7_9->jtag_info.scann_size = 4;
 624
 625         /* register arch-specific functions */
 626         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 627         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 628         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 629         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 630         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 631
 632         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 633         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 634         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 635
 636         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 637         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 638         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 639
 640         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 641         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 642         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 643
 644         arm7_9->write_pc = arm7tdmi_write_pc;
 645         arm7_9->branch_resume = arm7tdmi_branch_resume;
 646         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 647
 648         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 649         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 650
 651         arm7_9->bulk_write_memory = arm7_9_bulk_write_memory;
 652
 653         arm7_9->post_debug_entry = NULL;
 654
 655         arm7_9->pre_restore_context = NULL;
 656
 657         /* initialize arch-specific breakpoint handling */
 658         arm7_9->arm_bkpt = 0xdeeedeee;
 659         arm7_9->thumb_bkpt = 0xdeee;
 660
 661         arm7_9->dbgreq_adjust_pc = 2;
 662
 663         arm7_9_init_arch_info(target, arm7_9);
 664
 665         return ERROR_OK;
 666 }
 667
 668 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
 669 {
 670         struct arm7_9_common *arm7_9;
 671
 672         arm7_9 = calloc(1, sizeof(struct arm7_9_common));
 673         arm7tdmi_init_arch_info(target, arm7_9, target->tap);
 674         arm7_9->arm.is_armv4 = true;
 675
 676         return ERROR_OK;
 677 }
 678
 679 /** Holds methods for ARM7TDMI targets. */
 680 struct target_type arm7tdmi_target = {
 681         .name = "arm7tdmi",
 682
 683         .poll = arm7_9_poll,
 684         .arch_state = arm_arch_state,
 685
 686         .target_request_data = arm7_9_target_request_data,
 687
 688         .halt = arm7_9_halt,
 689         .resume = arm7_9_resume,
 690         .step = arm7_9_step,
 691
 692         .assert_reset = arm7_9_assert_reset,
 693         .deassert_reset = arm7_9_deassert_reset,
 694         .soft_reset_halt = arm7_9_soft_reset_halt,
 695
 696         .get_gdb_reg_list = arm_get_gdb_reg_list,
 697
 698         .read_memory = arm7_9_read_memory,
 699         .write_memory = arm7_9_write_memory_opt,
 700
 701         .checksum_memory = arm_checksum_memory,
 702         .blank_check_memory = arm_blank_check_memory,
 703
 704         .run_algorithm = armv4_5_run_algorithm,
 705
 706         .add_breakpoint = arm7_9_add_breakpoint,
 707         .remove_breakpoint = arm7_9_remove_breakpoint,
 708         .add_watchpoint = arm7_9_add_watchpoint,
 709         .remove_watchpoint = arm7_9_remove_watchpoint,
 710
 711         .commands  = arm7_9_command_handlers,
 712         .target_create  = arm7tdmi_target_create,
 713         .init_target = arm7tdmi_init_target,
 714         .examine = arm7_9_examine,
 715         .check_reset = arm7_9_check_reset,
 716 };