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
  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 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                 case 4:
 178                         if (be)
 179                                 h_u32_to_be(((uint8_t *)in), readback);
 180                         else
 181                                  h_u32_to_le(((uint8_t *)in), readback);
 182                         break;
 183                 case 2:
 184                         if (be)
 185                                 h_u16_to_be(((uint8_t *)in), readback & 0xffff);
 186                         else
 187                                 h_u16_to_le(((uint8_t *)in), readback & 0xffff);
 188                         break;
 189                 case 1:
 190                         *((uint8_t *)in) = readback & 0xff;
 191                         break;
 192         }
 193 }
 194
 195 static int arm7endianness(jtag_callback_data_t arg,
 196         jtag_callback_data_t size, jtag_callback_data_t be,
 197         jtag_callback_data_t captured)
 198 {
 199         uint8_t *in = (uint8_t *)arg;
 200
 201         arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1);
 202         return ERROR_OK;
 203 }
 204
 205 /* clock the target, and read the databus
 206  * the *in pointer points to a buffer where elements of 'size' bytes
 207  * are stored in big (be == 1) or little (be == 0) endianness
 208  */
 209 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
 210                 void *in, int size, int be)
 211 {
 212         int retval = ERROR_OK;
 213         struct scan_field fields[2];
 214
 215         retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
 216         if (retval != ERROR_OK)
 217                 return retval;
 218         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
 219         if (retval != ERROR_OK)
 220                 return retval;
 221
 222         fields[0].num_bits = 1;
 223         fields[0].out_value = NULL;
 224         fields[0].in_value = NULL;
 225
 226         fields[1].num_bits = 32;
 227         fields[1].out_value = NULL;
 228         fields[1].in_value = in;
 229
 230         jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
 231
 232         jtag_add_callback4(arm7endianness,
 233                 (jtag_callback_data_t)in,
 234                 (jtag_callback_data_t)size,
 235                 (jtag_callback_data_t)be,
 236                 (jtag_callback_data_t)in);
 237
 238         jtag_add_runtest(0, TAP_DRPAUSE);
 239
 240 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 241 {
 242                 retval = jtag_execute_queue();
 243                 if (retval != ERROR_OK)
 244                         return retval;
 245
 246                 if (in)
 247                         LOG_DEBUG("in: 0x%8.8x", *(uint32_t *)in);
 248                 else
 249                         LOG_ERROR("BUG: called with in == NULL");
 250 }
 251 #endif
 252
 253         return ERROR_OK;
 254 }
 255
 256 static void arm7tdmi_change_to_arm(struct target *target,
 257                 uint32_t *r0, uint32_t *pc)
 258 {
 259         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 260         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 261
 262         /* save r0 before using it and put system in ARM state
 263          * to allow common handling of ARM and THUMB debugging */
 264
 265         /* fetch STR r0, [r0] */
 266         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 267         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 268         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 269         /* nothing fetched, STR r0, [r0] in Execute (2) */
 270         arm7tdmi_clock_data_in(jtag_info, r0);
 271
 272         /* MOV r0, r15 fetched, STR in Decode */
 273         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
 274         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
 275         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 276         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 277         /* nothing fetched, STR r0, [r0] in Execute (2) */
 278         arm7tdmi_clock_data_in(jtag_info, pc);
 279
 280         /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
 281         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 282         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 283         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 284         /* nothing fetched, data for LDR r0, [PC, #0] */
 285         arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
 286         /* nothing fetched, data from previous cycle is written to register */
 287         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 288
 289         /* fetch BX */
 290         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
 291         /* NOP fetched, BX in Decode, MOV in Execute */
 292         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 293         /* NOP fetched, BX in Execute (1) */
 294         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 295
 296         jtag_execute_queue();
 297
 298         /* fix program counter:
 299          * MOV r0, r15 was the 4th instruction (+6)
 300          * reading PC in Thumb state gives address of instruction + 4
 301          */
 302         *pc -= 0xa;
 303 }
 304
 305 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
 306  * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
 307  *
 308  * The solution is to arrange for a large out/in scan in this loop and
 309  * and convert data afterwards.
 310  */
 311 static void arm7tdmi_read_core_regs(struct target *target,
 312                 uint32_t mask, uint32_t *core_regs[16])
 313 {
 314         int i;
 315         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 316         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 317
 318         /* STMIA r0-15, [r0] at debug speed
 319          * register values will start to appear on 4th DCLK
 320          */
 321         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 322
 323         /* fetch NOP, STM in DECODE stage */
 324         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 325         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 326         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 327
 328         for (i = 0; i <= 15; i++) {
 329                 if (mask & (1 << i))
 330                         /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
 331                         arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
 332         }
 333 }
 334
 335 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
 336                 uint32_t mask, void *buffer, int size)
 337 {
 338         int i;
 339         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 340         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 341         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 342         uint32_t *buf_u32 = buffer;
 343         uint16_t *buf_u16 = buffer;
 344         uint8_t *buf_u8 = buffer;
 345
 346         /* STMIA r0-15, [r0] at debug speed
 347          * register values will start to appear on 4th DCLK
 348          */
 349         arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 350
 351         /* fetch NOP, STM in DECODE stage */
 352         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 353         /* fetch NOP, STM in EXECUTE stage (1st cycle) */
 354         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 355
 356         for (i = 0; i <= 15; i++) {
 357                 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
 358                 if (mask & (1 << i)) {
 359                         switch (size) {
 360                                 case 4:
 361                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 362                                         break;
 363                                 case 2:
 364                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 365                                         break;
 366                                 case 1:
 367                                         arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 368                                         break;
 369                         }
 370                 }
 371         }
 372 }
 373
 374 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
 375 {
 376         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 377         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 378
 379         /* MRS r0, cpsr */
 380         arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
 381
 382         /* STR r0, [r15] */
 383         arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
 384         /* fetch NOP, STR in DECODE stage */
 385         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 386         /* fetch NOP, STR in EXECUTE stage (1st cycle) */
 387         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 388         /* nothing fetched, STR still in EXECUTE (2nd cycle) */
 389         arm7tdmi_clock_data_in(jtag_info, xpsr);
 390 }
 391
 392 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
 393 {
 394         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 395         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 396
 397         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 398
 399         /* MSR1 fetched */
 400         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
 401         /* MSR2 fetched, MSR1 in DECODE */
 402         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
 403         /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
 404         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
 405         /* nothing fetched, MSR1 in EXECUTE (2) */
 406         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 407         /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
 408         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
 409         /* nothing fetched, MSR2 in EXECUTE (2) */
 410         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 411         /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
 412         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 413         /* nothing fetched, MSR3 in EXECUTE (2) */
 414         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 415         /* NOP fetched, MSR4 in EXECUTE (1) */
 416         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 417         /* nothing fetched, MSR4 in EXECUTE (2) */
 418         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 419 }
 420
 421 static void arm7tdmi_write_xpsr_im8(struct target *target,
 422                 uint8_t xpsr_im, int rot, int spsr)
 423 {
 424         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 425         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 426
 427         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 428
 429         /* MSR fetched */
 430         arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
 431         /* NOP fetched, MSR in DECODE */
 432         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 433         /* NOP fetched, MSR in EXECUTE (1) */
 434         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 435         /* nothing fetched, MSR in EXECUTE (2) */
 436         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 437 }
 438
 439 static void arm7tdmi_write_core_regs(struct target *target,
 440                 uint32_t mask, uint32_t core_regs[16])
 441 {
 442         int i;
 443         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 444         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 445
 446         /* LDMIA r0-15, [r0] at debug speed
 447         * register values will start to appear on 4th DCLK
 448         */
 449         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
 450
 451         /* fetch NOP, LDM in DECODE stage */
 452         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 453         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 454         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 455
 456         for (i = 0; i <= 15; i++) {
 457                 if (mask & (1 << i))
 458                         /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
 459                         arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
 460         }
 461         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 462 }
 463
 464 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
 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-multiple 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_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
 473 }
 474
 475 static void arm7tdmi_load_hword_reg(struct target *target, int num)
 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 load half-word 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_LDRH_IP(num, 0), NULL, 0);
 484 }
 485
 486 static void arm7tdmi_load_byte_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 load byte 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_LDRB_IP(num, 0), NULL, 0);
 495 }
 496
 497 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
 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-multiple 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_STMIA(0, mask, 0, 1), NULL, 0);
 506 }
 507
 508 static void arm7tdmi_store_hword_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 store half-word 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_STRH_IP(num, 0), NULL, 0);
 517 }
 518
 519 static void arm7tdmi_store_byte_reg(struct target *target, int num)
 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 byte 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_STRB_IP(num, 0), NULL, 0);
 528 }
 529
 530 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
 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         /* LDMIA r0-15, [r0] at debug speed
 536          * register values will start to appear on 4th DCLK
 537          */
 538         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
 539         /* fetch NOP, LDM in DECODE stage */
 540         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 541         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 542         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 543         /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
 544         arm7tdmi_clock_out_inner(jtag_info, pc, 0);
 545         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
 546         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 547         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
 548         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 549         /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
 550         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 551         /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
 552         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
 553 }
 554
 555 static void arm7tdmi_branch_resume(struct target *target)
 556 {
 557         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 558         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 559
 560         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
 561         arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
 562 }
 563
 564 static void arm7tdmi_branch_resume_thumb(struct target *target)
 565 {
 566         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 567         struct arm *arm = &arm7_9->arm;
 568         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 569         struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 570
 571         LOG_DEBUG("-");
 572
 573         /* LDMIA r0, [r0] at debug speed
 574          * register values will start to appear on 4th DCLK
 575          */
 576         arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
 577
 578         /* fetch NOP, LDM in DECODE stage */
 579         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 580         /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
 581         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 582         /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
 583         arm7tdmi_clock_out(jtag_info,
 584                         buf_get_u32(arm->pc->value, 0, 32) | 1, NULL, 0);
 585         /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
 586         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 587
 588         /* Branch and eXchange */
 589         arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
 590
 591         embeddedice_read_reg(dbg_stat);
 592
 593         /* fetch NOP, BX in DECODE stage */
 594         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 595
 596         /* target is now in Thumb state */
 597         embeddedice_read_reg(dbg_stat);
 598
 599         /* fetch NOP, BX in EXECUTE stage (1st cycle) */
 600         arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
 601
 602         /* target is now in Thumb state */
 603         embeddedice_read_reg(dbg_stat);
 604
 605         /* load r0 value */
 606         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
 607         /* fetch NOP, LDR in Decode */
 608         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 609         /* fetch NOP, LDR in Execute */
 610         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 611         /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
 612         arm7tdmi_clock_out(jtag_info, buf_get_u32(arm->core_cache->reg_list[0].value, 0, 32), NULL, 0);
 613         /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
 614         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 615
 616         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 617         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
 618
 619         embeddedice_read_reg(dbg_stat);
 620
 621         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
 622         arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
 623 }
 624
 625 static void arm7tdmi_build_reg_cache(struct target *target)
 626 {
 627         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 628         struct arm *arm = target_to_arm(target);
 629
 630         (*cache_p) = arm_build_reg_cache(target, arm);
 631 }
 632
 633 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
 634 {
 635         arm7tdmi_build_reg_cache(target);
 636
 637         return ERROR_OK;
 638 }
 639
 640 int arm7tdmi_init_arch_info(struct target *target,
 641                 struct arm7_9_common *arm7_9, struct jtag_tap *tap)
 642 {
 643         /* prepare JTAG information for the new target */
 644         arm7_9->jtag_info.tap = tap;
 645         arm7_9->jtag_info.scann_size = 4;
 646
 647         /* register arch-specific functions */
 648         arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
 649         arm7_9->change_to_arm = arm7tdmi_change_to_arm;
 650         arm7_9->read_core_regs = arm7tdmi_read_core_regs;
 651         arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
 652         arm7_9->read_xpsr = arm7tdmi_read_xpsr;
 653
 654         arm7_9->write_xpsr = arm7tdmi_write_xpsr;
 655         arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
 656         arm7_9->write_core_regs = arm7tdmi_write_core_regs;
 657
 658         arm7_9->load_word_regs = arm7tdmi_load_word_regs;
 659         arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
 660         arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
 661
 662         arm7_9->store_word_regs = arm7tdmi_store_word_regs;
 663         arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
 664         arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
 665
 666         arm7_9->write_pc = arm7tdmi_write_pc;
 667         arm7_9->branch_resume = arm7tdmi_branch_resume;
 668         arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
 669
 670         arm7_9->enable_single_step = arm7_9_enable_eice_step;
 671         arm7_9->disable_single_step = arm7_9_disable_eice_step;
 672
 673         arm7_9->post_debug_entry = NULL;
 674
 675         arm7_9->pre_restore_context = NULL;
 676
 677         /* initialize arch-specific breakpoint handling */
 678         arm7_9->arm_bkpt = 0xdeeedeee;
 679         arm7_9->thumb_bkpt = 0xdeee;
 680
 681         arm7_9->dbgreq_adjust_pc = 2;
 682
 683         arm7_9_init_arch_info(target, arm7_9);
 684
 685         return ERROR_OK;
 686 }
 687
 688 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
 689 {
 690         struct arm7_9_common *arm7_9;
 691
 692         arm7_9 = calloc(1, sizeof(struct arm7_9_common));
 693         arm7tdmi_init_arch_info(target, arm7_9, target->tap);
 694         arm7_9->arm.is_armv4 = true;
 695
 696         return ERROR_OK;
 697 }
 698
 699 /** Holds methods for ARM7TDMI targets. */
 700 struct target_type arm7tdmi_target = {
 701         .name = "arm7tdmi",
 702
 703         .poll = arm7_9_poll,
 704         .arch_state = arm_arch_state,
 705
 706         .target_request_data = arm7_9_target_request_data,
 707
 708         .halt = arm7_9_halt,
 709         .resume = arm7_9_resume,
 710         .step = arm7_9_step,
 711
 712         .assert_reset = arm7_9_assert_reset,
 713         .deassert_reset = arm7_9_deassert_reset,
 714         .soft_reset_halt = arm7_9_soft_reset_halt,
 715
 716         .get_gdb_reg_list = arm_get_gdb_reg_list,
 717
 718         .read_memory = arm7_9_read_memory,
 719         .write_memory = arm7_9_write_memory,
 720         .bulk_write_memory = arm7_9_bulk_write_memory,
 721
 722         .checksum_memory = arm_checksum_memory,
 723         .blank_check_memory = arm_blank_check_memory,
 724
 725         .run_algorithm = armv4_5_run_algorithm,
 726
 727         .add_breakpoint = arm7_9_add_breakpoint,
 728         .remove_breakpoint = arm7_9_remove_breakpoint,
 729         .add_watchpoint = arm7_9_add_watchpoint,
 730         .remove_watchpoint = arm7_9_remove_watchpoint,
 731
 732         .commands  = arm7_9_command_handlers,
 733         .target_create  = arm7tdmi_target_create,
 734         .init_target = arm7tdmi_init_target,
 735         .examine = arm7_9_examine,
 736         .check_reset = arm7_9_check_reset,
 737 };