src/target/feroceon.c

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Marvell Semiconductors, Inc.                    *
   3  *   Written by Nicolas Pitre <nico@marvell.com>                           *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 /*
  22  * Marvell Feroceon (88F5182, 88F5281) support.
  23  *
  24  * The Feroceon core mimics the ARM926 ICE interface with the following
  25  * differences:
  26  *
  27  * - the MOE (method of entry) reporting is not implemented
  28  *
  29  * - breakpoint/watchpoint comparator #1 is seemingly not implemented
  30  *
  31  * - due to a different pipeline implementation, some injected debug
  32  *   instruction sequences have to be somewhat different
  33  *
  34  * Other issues:
  35  *
  36  * - asserting DBGRQ doesn't work if target is looping on the undef vector
  37  *
  38  * - the EICE version signature in the COMMS_CTL reg is next to the flow bits
  39  *   not at the top, and rather meaningless due to existing discrepencies
  40  *
  41  * - the DCC channel is half duplex (only one FIFO for both directions) with
  42  *   seemingly no proper flow control.
  43  */
  44
  45 #ifdef HAVE_CONFIG_H
  46 #include "config.h"
  47 #endif
  48
  49 #include "arm926ejs.h"
  50 #include "jtag.h"
  51 #include "log.h"
  52 #include "arm_simulator.h"
  53
  54 #include <stdlib.h>
  55 #include <string.h>
  56
  57 int feroceon_examine(struct target_s *target);
  58 int feroceon_target_create(struct target_s *target, Jim_Interp *interp);
  59 int feroceon_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer);
  60 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  61 int feroceon_quit(void);
  62
  63 int feroceon_assert_reset(target_t *target)
  64 {
  65         armv4_5_common_t *armv4_5 = target->arch_info;
  66         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  67         int ud = arm7_9->use_dbgrq;
  68
  69         arm7_9->use_dbgrq = 0;
  70         if (target->reset_halt)
  71                 arm7_9_halt(target);
  72         arm7_9->use_dbgrq = ud;
  73         return arm7_9_assert_reset(target);
  74 }
  75
  76 target_type_t feroceon_target =
  77 {
  78         .name = "feroceon",
  79
  80         .poll = arm7_9_poll,
  81         .arch_state = arm926ejs_arch_state,
  82
  83         .target_request_data = arm7_9_target_request_data,
  84
  85         .halt = arm7_9_halt,
  86         .resume = arm7_9_resume,
  87         .step = arm7_9_step,
  88
  89         .assert_reset = feroceon_assert_reset,
  90         .deassert_reset = arm7_9_deassert_reset,
  91         .soft_reset_halt = arm926ejs_soft_reset_halt,
  92
  93         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  94
  95         .read_memory = arm7_9_read_memory,
  96         .write_memory = arm926ejs_write_memory,
  97         .bulk_write_memory = feroceon_bulk_write_memory,
  98         .checksum_memory = arm7_9_checksum_memory,
  99         .blank_check_memory = arm7_9_blank_check_memory,
 100
 101         .run_algorithm = armv4_5_run_algorithm,
 102
 103         .add_breakpoint = arm7_9_add_breakpoint,
 104         .remove_breakpoint = arm7_9_remove_breakpoint,
 105         .add_watchpoint = arm7_9_add_watchpoint,
 106         .remove_watchpoint = arm7_9_remove_watchpoint,
 107
 108         .register_commands = arm926ejs_register_commands,
 109         .target_create = feroceon_target_create,
 110         .init_target = feroceon_init_target,
 111         .examine = feroceon_examine,
 112         .quit = feroceon_quit
 113 };
 114
 115
 116 int feroceon_dummy_clock_out(arm_jtag_t *jtag_info, u32 instr)
 117 {
 118         scan_field_t fields[3];
 119         u8 out_buf[4];
 120         u8 instr_buf[4];
 121         u8 sysspeed_buf = 0x0;
 122
 123         /* prepare buffer */
 124         buf_set_u32(out_buf, 0, 32, 0);
 125
 126         buf_set_u32(instr_buf, 0, 32, flip_u32(instr, 32));
 127
 128         jtag_add_end_state(TAP_PD);
 129         arm_jtag_scann(jtag_info, 0x1);
 130
 131         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 132
 133         fields[0].device = jtag_info->chain_pos;
 134         fields[0].num_bits = 32;
 135         fields[0].out_value = out_buf;
 136         fields[0].out_mask = NULL;
 137         fields[0].in_value = NULL;
 138         fields[0].in_handler = NULL;
 139         fields[0].in_handler_priv = NULL;
 140         fields[0].in_check_value = NULL;
 141         fields[0].in_check_mask = NULL;
 142
 143         fields[1].device = jtag_info->chain_pos;
 144         fields[1].num_bits = 3;
 145         fields[1].out_value = &sysspeed_buf;
 146         fields[1].out_mask = NULL;
 147         fields[1].in_value = NULL;
 148         fields[1].in_check_value = NULL;
 149         fields[1].in_check_mask = NULL;
 150         fields[1].in_handler = NULL;
 151         fields[1].in_handler_priv = NULL;
 152
 153         fields[2].device = jtag_info->chain_pos;
 154         fields[2].num_bits = 32;
 155         fields[2].out_value = instr_buf;
 156         fields[2].out_mask = NULL;
 157         fields[2].in_value = NULL;
 158         fields[2].in_check_value = NULL;
 159         fields[2].in_check_mask = NULL;
 160         fields[2].in_handler = NULL;
 161         fields[2].in_handler_priv = NULL;
 162
 163         jtag_add_dr_scan(3, fields, -1);
 164
 165         /* no jtag_add_runtest(0, -1) here */
 166
 167         return ERROR_OK;
 168 }
 169
 170 void feroceon_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 171 {
 172         armv4_5_common_t *armv4_5 = target->arch_info;
 173         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 174         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 175
 176         /*
 177          * save r0 before using it and put system in ARM state
 178          * to allow common handling of ARM and THUMB debugging
 179          */
 180
 181         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 182         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 183         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 184
 185         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 186         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 187         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 188         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, r0, 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, NULL, 0);
 191
 192         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), 0, NULL, 0);
 193         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 194         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 195         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 196         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, pc, 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, NULL, 0);
 199
 200         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_BX(15), 0, NULL, 0);
 201         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 202         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 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
 206         jtag_execute_queue();
 207
 208         /*
 209          * fix program counter:
 210          * MOV R0, PC was the 7th instruction (+12)
 211          * reading PC in Thumb state gives address of instruction + 4
 212          */
 213         *pc -= (12 + 4);
 214 }
 215
 216 void feroceon_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 217 {
 218         int i;
 219         armv4_5_common_t *armv4_5 = target->arch_info;
 220         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 221         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 222
 223         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 224         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 225         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 226
 227         for (i = 0; i <= 15; i++)
 228                 if (mask & (1 << i))
 229                         arm9tdmi_clock_data_in(jtag_info, core_regs[i]);
 230
 231         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 232         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 233 }
 234
 235 void feroceon_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 236 {
 237         int i;
 238         armv4_5_common_t *armv4_5 = target->arch_info;
 239         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 240         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 241         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 242         u32 *buf_u32 = buffer;
 243         u16 *buf_u16 = buffer;
 244         u8 *buf_u8 = buffer;
 245
 246         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 247         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 248         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 249
 250         for (i = 0; i <= 15; i++)
 251         {
 252                 if (mask & (1 << i)) {
 253                         switch (size)
 254                         {
 255                                 case 4:
 256                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 257                                         break;
 258                                 case 2:
 259                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 260                                         break;
 261                                 case 1:
 262                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 263                                         break;
 264                         }
 265                 }
 266         }
 267
 268         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 269         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 270 }
 271
 272 void feroceon_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 273 {
 274         armv4_5_common_t *armv4_5 = target->arch_info;
 275         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 276         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 277
 278         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), 0, NULL, 0);
 279         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 280         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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
 286         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 287         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 288         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 289         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, xpsr, 0);
 290
 291         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 292         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 293 }
 294
 295 void feroceon_write_xpsr(target_t *target, u32 xpsr, int spsr)
 296 {
 297         armv4_5_common_t *armv4_5 = target->arch_info;
 298         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 299         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 300
 301         LOG_DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 302
 303         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), 0, NULL, 0);
 304         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 305         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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
 311         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), 0, NULL, 0);
 312         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 313         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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
 319         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), 0, NULL, 0);
 320         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 321         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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
 327         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), 0, NULL, 0);
 328         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 329         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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 }
 335
 336 void feroceon_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 337 {
 338         armv4_5_common_t *armv4_5 = target->arch_info;
 339         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 340         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 341
 342         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 343
 344         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), 0, NULL, 0);
 345         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 346         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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 }
 352
 353 void feroceon_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 354 {
 355         int i;
 356         armv4_5_common_t *armv4_5 = target->arch_info;
 357         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 358         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 359
 360         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 361         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 362         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 363
 364         for (i = 0; i <= 15; i++)
 365                 if (mask & (1 << i))
 366                         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, core_regs[i], NULL, 0);
 367
 368         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 369         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 370         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 371 }
 372
 373 void feroceon_branch_resume(target_t *target)
 374 {
 375         armv4_5_common_t *armv4_5 = target->arch_info;
 376         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 377         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 378
 379         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 380         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 381         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 382         arm9tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffff9, 0), 0, NULL, 0);
 383         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 384
 385         arm7_9->need_bypass_before_restart = 1;
 386 }
 387
 388 void feroceon_branch_resume_thumb(target_t *target)
 389 {
 390         LOG_DEBUG("-");
 391
 392         armv4_5_common_t *armv4_5 = target->arch_info;
 393         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 394         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 395         u32 r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
 396         u32 pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 397         (void)(r0); // use R0...
 398
 399         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 400         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 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
 404         arm9tdmi_clock_out(jtag_info, 0xE28F0001, 0, NULL, 0); // add r0,pc,#1
 405         arm9tdmi_clock_out(jtag_info, ARMV4_5_BX(0), 0, NULL, 0);
 406         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 407         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 408
 409         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDMIA(0, 0x1), 0, NULL, 0);
 410         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 411         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 412
 413         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, pc, NULL, 0);
 414         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 415         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 416
 417         pc = (pc & 2) >> 1;
 418         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7e9 + pc), 0, NULL, 0);
 419         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 1);
 420
 421         arm7_9->need_bypass_before_restart = 1;
 422 }
 423
 424 int feroceon_read_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 *value)
 425 {
 426         armv4_5_common_t *armv4_5 = target->arch_info;
 427         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 428         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 429         int err;
 430
 431         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRC(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 432         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 433         err = arm7_9_execute_sys_speed(target);
 434         if (err != ERROR_OK)
 435                 return err;
 436
 437         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 438         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 439         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 440         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, value, 0);
 441         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 442         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 443         return jtag_execute_queue();
 444 }
 445
 446 int feroceon_write_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 value)
 447 {
 448         armv4_5_common_t *armv4_5 = target->arch_info;
 449         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 450         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 451
 452         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 1, 0, 0), 0, NULL, 0);
 453         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 454         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 455         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, value, NULL, 0);
 456         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 457         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 458         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 459
 460         arm9tdmi_clock_out(jtag_info, ARMV4_5_MCR(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 461         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 462         return arm7_9_execute_sys_speed(target);
 463 }
 464
 465 void feroceon_set_dbgrq(target_t *target)
 466 {
 467         armv4_5_common_t *armv4_5 = target->arch_info;
 468         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 469         reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
 470
 471         buf_set_u32(dbg_ctrl->value, 0, 8, 2);
 472         embeddedice_store_reg(dbg_ctrl);
 473 }
 474
 475 void feroceon_enable_single_step(target_t *target)
 476 {
 477         armv4_5_common_t *armv4_5 = target->arch_info;
 478         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 479         u32 next_pc;
 480
 481         /* calculate PC of next instruction */
 482         if (arm_simulate_step(target, &next_pc) != ERROR_OK)
 483         {
 484                 u32 current_pc, current_opcode;
 485                 current_pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 486                 target_read_u32(target, current_pc, &current_opcode);
 487                 LOG_ERROR("BUG: couldn't calculate PC of next instruction, "
 488                       "current opcode is 0x%8.8x", current_opcode);
 489                 next_pc = current_pc;
 490         }
 491         arm7_9_restore_context(target);
 492
 493         /* set a breakpoint there */
 494         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], next_pc);
 495         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0);
 496         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
 497         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
 498         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
 499 }
 500
 501 void feroceon_disable_single_step(target_t *target)
 502 {
 503         armv4_5_common_t *armv4_5 = target->arch_info;
 504         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 505
 506         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE]);
 507         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
 508         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
 509         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
 510         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
 511 }
 512
 513 int feroceon_examine_debug_reason(target_t *target)
 514 {
 515         /* the MOE is not implemented */
 516         if (target->debug_reason != DBG_REASON_SINGLESTEP)
 517         {
 518                 target->debug_reason = DBG_REASON_DBGRQ;
 519         }
 520
 521         return ERROR_OK;
 522 }
 523
 524 int feroceon_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
 525 {
 526         armv4_5_common_t *armv4_5 = target->arch_info;
 527         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 528         enum armv4_5_state core_state = armv4_5->core_state;
 529         u32 x, flip, shift, save[7];
 530         int i;
 531
 532         /*
 533          * We can't use the dcc flow control bits, so let's transfer data
 534          * with 31 bits and flip the MSB each time a new data word is sent.
 535          */
 536         static u32 dcc_code[] =
 537         {
 538                 0xee115e10,     /* 3:   mrc     p14, 0, r5, c1, c0, 0   */
 539                 0xe3a0301e,     /* 1:   mov     r3, #30                 */
 540                 0xe3a04002,     /*      mov     r4, #2                  */
 541                 0xee111e10,     /* 2:   mrc     p14, 0, r1, c1, c0, 0   */
 542                 0xe1310005,     /*      teq     r1, r5                  */
 543                 0x0afffffc,     /*      beq     1b                      */
 544                 0xe1a05001,     /*      mov     r5, r1                  */
 545                 0xe1a01081,     /*      mov     r1, r1, lsl #1          */
 546                 0xee112e10,     /* 3:   mrc     p14, 0, r2, c1, c0, 0   */
 547                 0xe1320005,     /*      teq     r2, r5                  */
 548                 0x0afffffc,     /*      beq     3b                      */
 549                 0xe1a05002,     /*      mov     r5, r2                  */
 550                 0xe3c22102,     /*      bic     r2, r2, #0x80000000     */
 551                 0xe1811332,     /*      orr     r1, r1, r2, lsr r3      */
 552                 0xe2533001,     /*      subs    r3, r3, #1              */
 553                 0xe4801004,     /*      str     r1, [r0], #4            */
 554                 0xe1a01412,     /*      mov     r1, r2, lsl r4          */
 555                 0xe2844001,     /*      add     r4, r4, #1              */
 556                 0x4affffed,     /*      bmi     1b                      */
 557                 0xeafffff3,     /*      b       3b                      */
 558         };
 559
 560         int dcc_size = sizeof(dcc_code);
 561
 562         if (!arm7_9->dcc_downloads)
 563                 return target->type->write_memory(target, address, 4, count, buffer);
 564
 565         /* regrab previously allocated working_area, or allocate a new one */
 566         if (!arm7_9->dcc_working_area)
 567         {
 568                 u8 dcc_code_buf[dcc_size];
 569
 570                 /* make sure we have a working area */
 571                 if (target_alloc_working_area(target, dcc_size, &arm7_9->dcc_working_area) != ERROR_OK)
 572                 {
 573                         LOG_INFO("no working area available, falling back to memory writes");
 574                         return target->type->write_memory(target, address, 4, count, buffer);
 575                 }
 576
 577                 /* copy target instructions to target endianness */
 578                 for (i = 0; i < dcc_size/4; i++)
 579                         target_buffer_set_u32(target, dcc_code_buf + i*4, dcc_code[i]);
 580
 581                 /* write DCC code to working area */
 582                 target->type->write_memory(target, arm7_9->dcc_working_area->address, 4, dcc_size, dcc_code_buf);
 583         }
 584
 585         /* backup clobbered processor state */
 586         for (i = 0; i <= 5; i++)
 587                 save[i] = buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32);
 588         save[i] = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 589
 590         /* set up target address in r0 */
 591         buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, address);
 592         armv4_5->core_cache->reg_list[0].valid = 1;
 593         armv4_5->core_cache->reg_list[0].dirty = 1;
 594         armv4_5->core_state = ARMV4_5_STATE_ARM;
 595
 596         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], 0);
 597         arm7_9_resume(target, 0, arm7_9->dcc_working_area->address, 1, 1);
 598
 599         /* send data over */
 600         x = 0;
 601         flip = 0;
 602         shift = 1;
 603         for (i = 0; i < count; i++)
 604         {
 605                 u32 y = target_buffer_get_u32(target, buffer);
 606                 u32 z = (x >> 1) | (y >> shift) | (flip ^= 0x80000000);
 607                 embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 608                 x = y << (32 - shift);
 609                 if (++shift >= 32 || i + 1 >= count)
 610                 {
 611                         z = (x >> 1) | (flip ^= 0x80000000);
 612                         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 613                         x = 0;
 614                         shift = 1;
 615                 }
 616                 buffer += 4;
 617         }
 618
 619         target_halt(target);
 620         while (target->state != TARGET_HALTED)
 621                 target_poll(target);
 622
 623         /* restore target state */
 624         for (i = 0; i <= 5; i++)
 625         {
 626                 buf_set_u32(armv4_5->core_cache->reg_list[i].value, 0, 32, save[i]);
 627                 armv4_5->core_cache->reg_list[i].valid = 1;
 628                 armv4_5->core_cache->reg_list[i].dirty = 1;
 629         }
 630         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, save[i]);
 631         armv4_5->core_cache->reg_list[15].valid = 1;
 632         armv4_5->core_cache->reg_list[15].dirty = 1;
 633         armv4_5->core_state = core_state;
 634
 635         return ERROR_OK;
 636 }
 637
 638 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 639 {
 640         arm9tdmi_init_target(cmd_ctx, target);
 641         return ERROR_OK;
 642 }
 643
 644 int feroceon_quit(void)
 645 {
 646         return ERROR_OK;
 647 }
 648
 649 int feroceon_target_create(struct target_s *target, Jim_Interp *interp)
 650 {
 651         armv4_5_common_t *armv4_5;
 652         arm7_9_common_t *arm7_9;
 653         arm926ejs_common_t *arm926ejs = calloc(1,sizeof(arm926ejs_common_t));
 654
 655         arm926ejs_init_arch_info(target, arm926ejs, target->chain_position, target->variant);
 656
 657         armv4_5 = target->arch_info;
 658         arm7_9 = armv4_5->arch_info;
 659
 660         /* override some insn sequence functions */
 661         arm7_9->change_to_arm = feroceon_change_to_arm;
 662         arm7_9->read_core_regs = feroceon_read_core_regs;
 663         arm7_9->read_core_regs_target_buffer = feroceon_read_core_regs_target_buffer;
 664         arm7_9->read_xpsr = feroceon_read_xpsr;
 665         arm7_9->write_xpsr = feroceon_write_xpsr;
 666         arm7_9->write_xpsr_im8 = feroceon_write_xpsr_im8;
 667         arm7_9->write_core_regs = feroceon_write_core_regs;
 668         arm7_9->branch_resume = feroceon_branch_resume;
 669         arm7_9->branch_resume_thumb = feroceon_branch_resume_thumb;
 670
 671         /* must be implemented with only one comparator */
 672         arm7_9->enable_single_step = feroceon_enable_single_step;
 673         arm7_9->disable_single_step = feroceon_disable_single_step;
 674
 675         /* MOE is not implemented */
 676         arm7_9->examine_debug_reason = feroceon_examine_debug_reason;
 677
 678         /* the standard ARM926 methods don't always work (don't ask...) */
 679         arm926ejs->read_cp15 = feroceon_read_cp15;
 680         arm926ejs->write_cp15 = feroceon_write_cp15;
 681
 682         /* Note: asserting DBGRQ might not win over the undef exception.
 683            If that happens then just use "arm7_9 dbgrq disable". */
 684         arm7_9->use_dbgrq = 1;
 685         arm7_9->set_special_dbgrq = feroceon_set_dbgrq;
 686
 687         /* only one working comparator */
 688         arm7_9->wp_available_max = 1;
 689         arm7_9->wp1_used_default = -1;
 690
 691         return ERROR_OK;
 692 }
 693
 694
 695 int feroceon_examine(struct target_s *target)
 696 {
 697         armv4_5_common_t *armv4_5;
 698         arm7_9_common_t *arm7_9;
 699         int retval;
 700
 701         retval = arm9tdmi_examine(target);
 702         if (retval!=ERROR_OK)
 703                 return retval;
 704
 705         armv4_5 = target->arch_info;
 706         arm7_9 = armv4_5->arch_info;
 707
 708         /* the COMMS_CTRL bits are all contiguous */
 709         if (buf_get_u32(arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL].value, 2, 4) != 6)
 710                 LOG_ERROR("unexpected Feroceon EICE version signature");
 711
 712         arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].size = 6;
 713         arm7_9->eice_cache->reg_list[EICE_DBG_STAT].size = 5;
 714         arm7_9->has_monitor_mode = 1;
 715
 716         /* vector catch reg is not initialized on reset */
 717         embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0);
 718
 719         /* clear monitor mode, enable comparators */
 720         embeddedice_read_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 721         jtag_execute_queue();
 722         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 4, 1, 0);
 723         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 5, 1, 0);
 724         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 725
 726         return ERROR_OK;
 727 }