src/target/feroceon.c

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Marvell Semiconductors, Inc.                    *
   3  *   Written by Nicolas Pitre <nico@marvell.com>                           *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Hongtao Zheng                                   *
   6  *   hontor@126.com                                                        *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23
  24 /*
  25  * Marvell Feroceon (88F5182, 88F5281) support.
  26  *
  27  * The Feroceon core mimics the ARM926 ICE interface with the following
  28  * differences:
  29  *
  30  * - the MOE (method of entry) reporting is not implemented
  31  *
  32  * - breakpoint/watchpoint comparator #1 is seemingly not implemented
  33  *
  34  * - due to a different pipeline implementation, some injected debug
  35  *   instruction sequences have to be somewhat different
  36  *
  37  * Other issues:
  38  *
  39  * - asserting DBGRQ doesn't work if target is looping on the undef vector
  40  *
  41  * - the EICE version signature in the COMMS_CTL reg is next to the flow bits
  42  *   not at the top, and rather meaningless due to existing discrepencies
  43  *
  44  * - the DCC channel is half duplex (only one FIFO for both directions) with
  45  *   seemingly no proper flow control.
  46  */
  47
  48 #ifdef HAVE_CONFIG_H
  49 #include "config.h"
  50 #endif
  51
  52 #include "arm926ejs.h"
  53 #include "jtag.h"
  54 #include "log.h"
  55
  56 #include <stdlib.h>
  57 #include <string.h>
  58
  59 int feroceon_examine(struct target_s *target);
  60 int feroceon_target_create(struct target_s *target, Jim_Interp *interp);
  61 int feroceon_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer);
  62 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  63 int feroceon_quit(void);
  64
  65 int feroceon_assert_reset(target_t *target)
  66 {
  67         armv4_5_common_t *armv4_5 = target->arch_info;
  68         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  69         int ud = arm7_9->use_dbgrq;
  70
  71         arm7_9->use_dbgrq = 0;
  72         if (target->reset_halt)
  73                 arm7_9_halt(target);
  74         arm7_9->use_dbgrq = ud;
  75         return arm7_9_assert_reset(target);
  76 }
  77
  78 target_type_t feroceon_target =
  79 {
  80         .name = "feroceon",
  81
  82         .poll = arm7_9_poll,
  83         .arch_state = arm926ejs_arch_state,
  84
  85         .target_request_data = arm7_9_target_request_data,
  86
  87         .halt = arm7_9_halt,
  88         .resume = arm7_9_resume,
  89         .step = arm7_9_step,
  90
  91         .assert_reset = feroceon_assert_reset,
  92         .deassert_reset = arm7_9_deassert_reset,
  93         .soft_reset_halt = arm926ejs_soft_reset_halt,
  94
  95         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  96
  97         .read_memory = arm7_9_read_memory,
  98         .write_memory = arm926ejs_write_memory,
  99         .bulk_write_memory = feroceon_bulk_write_memory,
 100         .checksum_memory = arm7_9_checksum_memory,
 101         .blank_check_memory = arm7_9_blank_check_memory,
 102
 103         .run_algorithm = armv4_5_run_algorithm,
 104
 105         .add_breakpoint = arm7_9_add_breakpoint,
 106         .remove_breakpoint = arm7_9_remove_breakpoint,
 107         .add_watchpoint = arm7_9_add_watchpoint,
 108         .remove_watchpoint = arm7_9_remove_watchpoint,
 109
 110         .register_commands = arm926ejs_register_commands,
 111         .target_create = feroceon_target_create,
 112         .init_target = feroceon_init_target,
 113         .examine = feroceon_examine,
 114         .quit = feroceon_quit
 115 };
 116
 117
 118 int feroceon_dummy_clock_out(arm_jtag_t *jtag_info, u32 instr)
 119 {
 120         scan_field_t fields[3];
 121         u8 out_buf[4];
 122         u8 instr_buf[4];
 123         u8 sysspeed_buf = 0x0;
 124
 125         /* prepare buffer */
 126         buf_set_u32(out_buf, 0, 32, 0);
 127
 128         buf_set_u32(instr_buf, 0, 32, flip_u32(instr, 32));
 129
 130         jtag_add_end_state(TAP_DRPAUSE);
 131         arm_jtag_scann(jtag_info, 0x1);
 132
 133         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 134
 135         fields[0].tap = jtag_info->tap;
 136         fields[0].num_bits = 32;
 137         fields[0].out_value = out_buf;
 138         fields[0].out_mask = NULL;
 139         fields[0].in_value = NULL;
 140         fields[0].in_handler = NULL;
 141         fields[0].in_handler_priv = NULL;
 142         fields[0].in_check_value = NULL;
 143         fields[0].in_check_mask = NULL;
 144
 145         fields[1].tap = jtag_info->tap;
 146         fields[1].num_bits = 3;
 147         fields[1].out_value = &sysspeed_buf;
 148         fields[1].out_mask = NULL;
 149         fields[1].in_value = NULL;
 150         fields[1].in_check_value = NULL;
 151         fields[1].in_check_mask = NULL;
 152         fields[1].in_handler = NULL;
 153         fields[1].in_handler_priv = NULL;
 154
 155         fields[2].tap = jtag_info->tap;
 156         fields[2].num_bits = 32;
 157         fields[2].out_value = instr_buf;
 158         fields[2].out_mask = NULL;
 159         fields[2].in_value = NULL;
 160         fields[2].in_check_value = NULL;
 161         fields[2].in_check_mask = NULL;
 162         fields[2].in_handler = NULL;
 163         fields[2].in_handler_priv = NULL;
 164
 165         jtag_add_dr_scan(3, fields, -1);
 166
 167         /* no jtag_add_runtest(0, -1) here */
 168
 169         return ERROR_OK;
 170 }
 171
 172 void feroceon_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 173 {
 174         armv4_5_common_t *armv4_5 = target->arch_info;
 175         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 176         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 177
 178         /*
 179          * save r0 before using it and put system in ARM state
 180          * to allow common handling of ARM and THUMB debugging
 181          */
 182
 183         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 184         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 185         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 186
 187         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 188         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 189         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 190         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, r0, 0);
 191         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 192         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 193
 194         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), 0, NULL, 0);
 195         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 196         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 197         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 198         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, pc, 0);
 199         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 200         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 201
 202         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_BX(15), 0, NULL, 0);
 203         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 204         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 205         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 206         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 207
 208         jtag_execute_queue();
 209
 210         /*
 211          * fix program counter:
 212          * MOV R0, PC was the 7th instruction (+12)
 213          * reading PC in Thumb state gives address of instruction + 4
 214          */
 215         *pc -= (12 + 4);
 216 }
 217
 218 void feroceon_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 219 {
 220         int i;
 221         armv4_5_common_t *armv4_5 = target->arch_info;
 222         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 223         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 224
 225         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 226         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 227         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 228
 229         for (i = 0; i <= 15; i++)
 230                 if (mask & (1 << i))
 231                         arm9tdmi_clock_data_in(jtag_info, core_regs[i]);
 232
 233         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 234         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 235 }
 236
 237 void feroceon_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 238 {
 239         int i;
 240         armv4_5_common_t *armv4_5 = target->arch_info;
 241         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 242         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 243         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 244         u32 *buf_u32 = buffer;
 245         u16 *buf_u16 = buffer;
 246         u8 *buf_u8 = buffer;
 247
 248         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 249         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 250         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 251
 252         for (i = 0; i <= 15; i++)
 253         {
 254                 if (mask & (1 << i)) {
 255                         switch (size)
 256                         {
 257                                 case 4:
 258                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 259                                         break;
 260                                 case 2:
 261                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 262                                         break;
 263                                 case 1:
 264                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 265                                         break;
 266                         }
 267                 }
 268         }
 269
 270         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 271         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 272 }
 273
 274 void feroceon_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 275 {
 276         armv4_5_common_t *armv4_5 = target->arch_info;
 277         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 278         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 279
 280         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), 0, NULL, 0);
 281         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 282         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 283         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 284         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 285         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 286         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 287
 288         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 289         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 290         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 291         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, xpsr, 0);
 292
 293         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 294         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 295 }
 296
 297 void feroceon_write_xpsr(target_t *target, u32 xpsr, int spsr)
 298 {
 299         armv4_5_common_t *armv4_5 = target->arch_info;
 300         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 301         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 302
 303         LOG_DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 304
 305         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), 0, NULL, 0);
 306         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 307         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 308         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 309         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 310         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 311         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 312
 313         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), 0, NULL, 0);
 314         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 315         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 316         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 317         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 318         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 319         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 320
 321         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), 0, NULL, 0);
 322         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 323         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 324         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 325         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 326         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 327         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 328
 329         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), 0, NULL, 0);
 330         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 331         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 332         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 333         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 334         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 335         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 336 }
 337
 338 void feroceon_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 339 {
 340         armv4_5_common_t *armv4_5 = target->arch_info;
 341         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 342         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 343
 344         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 345
 346         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), 0, NULL, 0);
 347         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 348         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 349         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 350         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 351         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 352         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 353 }
 354
 355 void feroceon_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 356 {
 357         int i;
 358         armv4_5_common_t *armv4_5 = target->arch_info;
 359         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 360         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 361
 362         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 363         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 364         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 365
 366         for (i = 0; i <= 15; i++)
 367                 if (mask & (1 << i))
 368                         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, core_regs[i], NULL, 0);
 369
 370         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 371         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 372         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 373 }
 374
 375 void feroceon_branch_resume(target_t *target)
 376 {
 377         armv4_5_common_t *armv4_5 = target->arch_info;
 378         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 379         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 380
 381         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 382         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 383         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 384         arm9tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffff9, 0), 0, NULL, 0);
 385         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 386
 387         arm7_9->need_bypass_before_restart = 1;
 388 }
 389
 390 void feroceon_branch_resume_thumb(target_t *target)
 391 {
 392         LOG_DEBUG("-");
 393
 394         armv4_5_common_t *armv4_5 = target->arch_info;
 395         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 396         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 397         u32 r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
 398         u32 pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 399         (void)(r0); // use R0...
 400
 401         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 402         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 403         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 404         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 405
 406         arm9tdmi_clock_out(jtag_info, 0xE28F0001, 0, NULL, 0); // add r0,pc,#1
 407         arm9tdmi_clock_out(jtag_info, ARMV4_5_BX(0), 0, NULL, 0);
 408         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 409         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 410
 411         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDMIA(0, 0x1), 0, NULL, 0);
 412         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 413         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 414
 415         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, pc, NULL, 0);
 416         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 417         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 418
 419         pc = (pc & 2) >> 1;
 420         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7e9 + pc), 0, NULL, 0);
 421         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 1);
 422
 423         arm7_9->need_bypass_before_restart = 1;
 424 }
 425
 426 int feroceon_read_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 *value)
 427 {
 428         armv4_5_common_t *armv4_5 = target->arch_info;
 429         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 430         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 431         int err;
 432
 433         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRC(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 434         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 435         err = arm7_9_execute_sys_speed(target);
 436         if (err != ERROR_OK)
 437                 return err;
 438
 439         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 440         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 441         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 442         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, value, 0);
 443         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 444         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 445         return jtag_execute_queue();
 446 }
 447
 448 int feroceon_write_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 value)
 449 {
 450         armv4_5_common_t *armv4_5 = target->arch_info;
 451         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 452         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 453
 454         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 1, 0, 0), 0, NULL, 0);
 455         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 456         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 457         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, value, NULL, 0);
 458         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 459         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 460         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 461
 462         arm9tdmi_clock_out(jtag_info, ARMV4_5_MCR(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 463         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 464         return arm7_9_execute_sys_speed(target);
 465 }
 466
 467 void feroceon_set_dbgrq(target_t *target)
 468 {
 469         armv4_5_common_t *armv4_5 = target->arch_info;
 470         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 471         reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
 472
 473         buf_set_u32(dbg_ctrl->value, 0, 8, 2);
 474         embeddedice_store_reg(dbg_ctrl);
 475 }
 476
 477 void feroceon_enable_single_step(target_t *target, u32 next_pc)
 478 {
 479         armv4_5_common_t *armv4_5 = target->arch_info;
 480         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 481
 482         /* set a breakpoint there */
 483         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], next_pc);
 484         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0);
 485         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
 486         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
 487         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
 488 }
 489
 490 void feroceon_disable_single_step(target_t *target)
 491 {
 492         armv4_5_common_t *armv4_5 = target->arch_info;
 493         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 494
 495         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE]);
 496         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
 497         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
 498         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
 499         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
 500 }
 501
 502 int feroceon_examine_debug_reason(target_t *target)
 503 {
 504         /* the MOE is not implemented */
 505         if (target->debug_reason != DBG_REASON_SINGLESTEP)
 506         {
 507                 target->debug_reason = DBG_REASON_DBGRQ;
 508         }
 509
 510         return ERROR_OK;
 511 }
 512
 513 int feroceon_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
 514 {
 515         int retval;
 516         armv4_5_common_t *armv4_5 = target->arch_info;
 517         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 518         enum armv4_5_state core_state = armv4_5->core_state;
 519         u32 x, flip, shift, save[7];
 520         int i;
 521
 522         /*
 523          * We can't use the dcc flow control bits, so let's transfer data
 524          * with 31 bits and flip the MSB each time a new data word is sent.
 525          */
 526         static u32 dcc_code[] =
 527         {
 528                 0xee115e10,     /* 3:   mrc     p14, 0, r5, c1, c0, 0   */
 529                 0xe3a0301e,     /* 1:   mov     r3, #30                 */
 530                 0xe3a04002,     /*      mov     r4, #2                  */
 531                 0xee111e10,     /* 2:   mrc     p14, 0, r1, c1, c0, 0   */
 532                 0xe1310005,     /*      teq     r1, r5                  */
 533                 0x0afffffc,     /*      beq     1b                      */
 534                 0xe1a05001,     /*      mov     r5, r1                  */
 535                 0xe1a01081,     /*      mov     r1, r1, lsl #1          */
 536                 0xee112e10,     /* 3:   mrc     p14, 0, r2, c1, c0, 0   */
 537                 0xe1320005,     /*      teq     r2, r5                  */
 538                 0x0afffffc,     /*      beq     3b                      */
 539                 0xe1a05002,     /*      mov     r5, r2                  */
 540                 0xe3c22102,     /*      bic     r2, r2, #0x80000000     */
 541                 0xe1811332,     /*      orr     r1, r1, r2, lsr r3      */
 542                 0xe2533001,     /*      subs    r3, r3, #1              */
 543                 0xe4801004,     /*      str     r1, [r0], #4            */
 544                 0xe1a01412,     /*      mov     r1, r2, lsl r4          */
 545                 0xe2844001,     /*      add     r4, r4, #1              */
 546                 0x4affffed,     /*      bmi     1b                      */
 547                 0xeafffff3,     /*      b       3b                      */
 548         };
 549
 550         int dcc_size = sizeof(dcc_code);
 551
 552         if (!arm7_9->dcc_downloads)
 553                 return target->type->write_memory(target, address, 4, count, buffer);
 554
 555         /* regrab previously allocated working_area, or allocate a new one */
 556         if (!arm7_9->dcc_working_area)
 557         {
 558                 u8 dcc_code_buf[dcc_size];
 559
 560                 /* make sure we have a working area */
 561                 if (target_alloc_working_area(target, dcc_size, &arm7_9->dcc_working_area) != ERROR_OK)
 562                 {
 563                         LOG_INFO("no working area available, falling back to memory writes");
 564                         return target->type->write_memory(target, address, 4, count, buffer);
 565                 }
 566
 567                 /* copy target instructions to target endianness */
 568                 for (i = 0; i < dcc_size/4; i++)
 569                         target_buffer_set_u32(target, dcc_code_buf + i*4, dcc_code[i]);
 570
 571                 /* write DCC code to working area */
 572                 if((retval = target->type->write_memory(target, arm7_9->dcc_working_area->address, 4, dcc_size, dcc_code_buf)) != ERROR_OK)
 573                 {
 574                         return retval;
 575                 }
 576         }
 577
 578         /* backup clobbered processor state */
 579         for (i = 0; i <= 5; i++)
 580                 save[i] = buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32);
 581         save[i] = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 582
 583         /* set up target address in r0 */
 584         buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, address);
 585         armv4_5->core_cache->reg_list[0].valid = 1;
 586         armv4_5->core_cache->reg_list[0].dirty = 1;
 587         armv4_5->core_state = ARMV4_5_STATE_ARM;
 588
 589         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], 0);
 590         arm7_9_resume(target, 0, arm7_9->dcc_working_area->address, 1, 1);
 591
 592         /* send data over */
 593         x = 0;
 594         flip = 0;
 595         shift = 1;
 596         for (i = 0; i < count; i++)
 597         {
 598                 u32 y = target_buffer_get_u32(target, buffer);
 599                 u32 z = (x >> 1) | (y >> shift) | (flip ^= 0x80000000);
 600                 embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 601                 x = y << (32 - shift);
 602                 if (++shift >= 32 || i + 1 >= count)
 603                 {
 604                         z = (x >> 1) | (flip ^= 0x80000000);
 605                         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 606                         x = 0;
 607                         shift = 1;
 608                 }
 609                 buffer += 4;
 610         }
 611
 612         target_halt(target);
 613         while (target->state != TARGET_HALTED)
 614                 target_poll(target);
 615
 616         /* restore target state */
 617         for (i = 0; i <= 5; i++)
 618         {
 619                 buf_set_u32(armv4_5->core_cache->reg_list[i].value, 0, 32, save[i]);
 620                 armv4_5->core_cache->reg_list[i].valid = 1;
 621                 armv4_5->core_cache->reg_list[i].dirty = 1;
 622         }
 623         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, save[i]);
 624         armv4_5->core_cache->reg_list[15].valid = 1;
 625         armv4_5->core_cache->reg_list[15].dirty = 1;
 626         armv4_5->core_state = core_state;
 627
 628         return ERROR_OK;
 629 }
 630
 631 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 632 {
 633         arm9tdmi_init_target(cmd_ctx, target);
 634         return ERROR_OK;
 635 }
 636
 637 int feroceon_quit(void)
 638 {
 639         return ERROR_OK;
 640 }
 641
 642 int feroceon_target_create(struct target_s *target, Jim_Interp *interp)
 643 {
 644         armv4_5_common_t *armv4_5;
 645         arm7_9_common_t *arm7_9;
 646         arm926ejs_common_t *arm926ejs = calloc(1,sizeof(arm926ejs_common_t));
 647
 648         arm926ejs_init_arch_info(target, arm926ejs, target->tap);
 649
 650         armv4_5 = target->arch_info;
 651         arm7_9 = armv4_5->arch_info;
 652
 653         /* override some insn sequence functions */
 654         arm7_9->change_to_arm = feroceon_change_to_arm;
 655         arm7_9->read_core_regs = feroceon_read_core_regs;
 656         arm7_9->read_core_regs_target_buffer = feroceon_read_core_regs_target_buffer;
 657         arm7_9->read_xpsr = feroceon_read_xpsr;
 658         arm7_9->write_xpsr = feroceon_write_xpsr;
 659         arm7_9->write_xpsr_im8 = feroceon_write_xpsr_im8;
 660         arm7_9->write_core_regs = feroceon_write_core_regs;
 661         arm7_9->branch_resume = feroceon_branch_resume;
 662         arm7_9->branch_resume_thumb = feroceon_branch_resume_thumb;
 663
 664         /* must be implemented with only one comparator */
 665         arm7_9->enable_single_step = feroceon_enable_single_step;
 666         arm7_9->disable_single_step = feroceon_disable_single_step;
 667
 668         /* MOE is not implemented */
 669         arm7_9->examine_debug_reason = feroceon_examine_debug_reason;
 670
 671         /* the standard ARM926 methods don't always work (don't ask...) */
 672         arm926ejs->read_cp15 = feroceon_read_cp15;
 673         arm926ejs->write_cp15 = feroceon_write_cp15;
 674
 675         /* Note: asserting DBGRQ might not win over the undef exception.
 676            If that happens then just use "arm7_9 dbgrq disable". */
 677         arm7_9->use_dbgrq = 1;
 678         arm7_9->set_special_dbgrq = feroceon_set_dbgrq;
 679
 680         /* only one working comparator */
 681         arm7_9->wp_available_max = 1;
 682         arm7_9->wp1_used_default = -1;
 683
 684         return ERROR_OK;
 685 }
 686
 687 int feroceon_examine(struct target_s *target)
 688 {
 689         armv4_5_common_t *armv4_5;
 690         arm7_9_common_t *arm7_9;
 691         int retval;
 692
 693         retval = arm9tdmi_examine(target);
 694         if (retval!=ERROR_OK)
 695                 return retval;
 696
 697         armv4_5 = target->arch_info;
 698         arm7_9 = armv4_5->arch_info;
 699
 700         /* the COMMS_CTRL bits are all contiguous */
 701         if (buf_get_u32(arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL].value, 2, 4) != 6)
 702                 LOG_ERROR("unexpected Feroceon EICE version signature");
 703
 704         arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].size = 6;
 705         arm7_9->eice_cache->reg_list[EICE_DBG_STAT].size = 5;
 706         arm7_9->has_monitor_mode = 1;
 707
 708         /* vector catch reg is not initialized on reset */
 709         embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0);
 710
 711         /* clear monitor mode, enable comparators */
 712         embeddedice_read_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 713         jtag_execute_queue();
 714         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 4, 1, 0);
 715         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 5, 1, 0);
 716         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 717
 718         return ERROR_OK;
 719 }