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
  58 int feroceon_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target);
  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();
  62
  63 target_type_t feroceon_target =
  64 {
  65         .name = "feroceon",
  66
  67         .poll = arm7_9_poll,
  68         .arch_state = arm926ejs_arch_state,
  69
  70         .target_request_data = arm7_9_target_request_data,
  71
  72         .halt = arm7_9_halt,
  73         .resume = arm7_9_resume,
  74         .step = arm7_9_step,
  75
  76         .assert_reset = arm7_9_assert_reset,
  77         .deassert_reset = arm7_9_deassert_reset,
  78         .soft_reset_halt = arm926ejs_soft_reset_halt,
  79         .prepare_reset_halt = arm7_9_prepare_reset_halt,
  80
  81         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  82
  83         .read_memory = arm7_9_read_memory,
  84         .write_memory = arm926ejs_write_memory,
  85         .bulk_write_memory = feroceon_bulk_write_memory,
  86         .checksum_memory = arm7_9_checksum_memory,
  87
  88         .run_algorithm = armv4_5_run_algorithm,
  89
  90         .add_breakpoint = arm7_9_add_breakpoint,
  91         .remove_breakpoint = arm7_9_remove_breakpoint,
  92         .add_watchpoint = arm7_9_add_watchpoint,
  93         .remove_watchpoint = arm7_9_remove_watchpoint,
  94
  95         .register_commands = arm926ejs_register_commands,
  96         .target_command = feroceon_target_command,
  97         .init_target = feroceon_init_target,
  98         .quit = feroceon_quit
  99 };
 100
 101
 102 void feroceon_change_to_arm(target_t *target, u32 *r0, u32 *pc)
 103 {
 104         armv4_5_common_t *armv4_5 = target->arch_info;
 105         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 106         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 107
 108         /*
 109          * save r0 before using it and put system in ARM state
 110          * to allow common handling of ARM and THUMB debugging
 111          */
 112
 113         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 114         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 115         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 116         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 117         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 118         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 119         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, r0, 0);
 120         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 121         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 122
 123         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), 0, NULL, 0);
 124         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 125         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 126         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 127         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, pc, 0);
 128         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 129         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 130
 131         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_BX(15), 0, NULL, 0);
 132         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 133         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 134         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 135         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 136
 137         jtag_execute_queue();
 138
 139         /*
 140          * fix program counter:
 141          * MOV R0, PC was the 10th instruction (+18)
 142          * reading PC in Thumb state gives address of instruction + 4
 143          */
 144         *pc -= 22;
 145 }
 146
 147 void feroceon_read_core_regs(target_t *target, u32 mask, u32* core_regs[16])
 148 {
 149         int i;
 150         armv4_5_common_t *armv4_5 = target->arch_info;
 151         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 152         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 153
 154         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 155         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 156         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 157
 158         for (i = 0; i <= 15; i++)
 159                 if (mask & (1 << i))
 160                         arm9tdmi_clock_data_in(jtag_info, core_regs[i]);
 161
 162         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 163         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 164 }
 165
 166 void feroceon_read_core_regs_target_buffer(target_t *target, u32 mask, void* buffer, int size)
 167 {
 168         int i;
 169         armv4_5_common_t *armv4_5 = target->arch_info;
 170         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 171         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 172         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 173         u32 *buf_u32 = buffer;
 174         u16 *buf_u16 = buffer;
 175         u8 *buf_u8 = buffer;
 176
 177         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 178         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 179         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 180
 181         for (i = 0; i <= 15; i++)
 182         {
 183                 if (mask & (1 << i)) {
 184                         switch (size)
 185                         {
 186                                 case 4:
 187                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 188                                         break;
 189                                 case 2:
 190                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 191                                         break;
 192                                 case 1:
 193                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 194                                         break;
 195                         }
 196                 }
 197         }
 198
 199         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 200         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 201 }
 202
 203 void feroceon_read_xpsr(target_t *target, u32 *xpsr, int spsr)
 204 {
 205         armv4_5_common_t *armv4_5 = target->arch_info;
 206         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 207         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 208
 209         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), 0, NULL, 0);
 210         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 211         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 212         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 213         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 214         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 215         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 216
 217         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 218         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 219         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 220         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, xpsr, 0);
 221
 222         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 223         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 224 }
 225
 226 void feroceon_write_xpsr(target_t *target, u32 xpsr, int spsr)
 227 {
 228         armv4_5_common_t *armv4_5 = target->arch_info;
 229         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 230         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 231
 232         DEBUG("xpsr: %8.8x, spsr: %i", xpsr, spsr);
 233
 234         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), 0, NULL, 0);
 235         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 236         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 237         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 238         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 239         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 240         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 241
 242         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), 0, NULL, 0);
 243         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 244         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 245         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 246         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), 0, NULL, 0);
 251         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 252         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 253         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 254         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 255         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 256         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 257
 258         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), 0, NULL, 0);
 259         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 260         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 261         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 262         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 263         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 264         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 265 }
 266
 267 void feroceon_write_xpsr_im8(target_t *target, u8 xpsr_im, int rot, int spsr)
 268 {
 269         armv4_5_common_t *armv4_5 = target->arch_info;
 270         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 271         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 272
 273         DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 274
 275         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), 0, NULL, 0);
 276         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 277         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 278         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 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 }
 283
 284 void feroceon_write_core_regs(target_t *target, u32 mask, u32 core_regs[16])
 285 {
 286         int i;
 287         armv4_5_common_t *armv4_5 = target->arch_info;
 288         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 289         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 290
 291         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 292         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 293         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 294
 295         for (i = 0; i <= 15; i++)
 296                 if (mask & (1 << i))
 297                         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, core_regs[i], NULL, 0);
 298
 299         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 300         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 301         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 302 }
 303
 304 void feroceon_branch_resume(target_t *target)
 305 {
 306         armv4_5_common_t *armv4_5 = target->arch_info;
 307         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 308         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 309
 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         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 313         arm9tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffff9, 0), 0, NULL, 0);
 314         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 315
 316         /* need BYPASS before RESTART */
 317         jtag_add_end_state(TAP_RTI);
 318         arm_jtag_set_instr(jtag_info, 0xf, NULL);
 319 }
 320
 321 void feroceon_branch_resume_thumb(target_t *target)
 322 {
 323         DEBUG("-");
 324
 325         armv4_5_common_t *armv4_5 = target->arch_info;
 326         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 327         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 328         u32 r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
 329         u32 pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 330
 331         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), 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, pc & ~3, NULL, 0);
 335         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 336         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 337         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 338
 339         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 340         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 341         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 342         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 343
 344         arm9tdmi_clock_out(jtag_info, 0xE28F0001, 0, NULL, 0); /* add r0,r15,#1 */
 345         arm9tdmi_clock_out(jtag_info, ARMV4_5_BX(0), 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
 349         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDMIA(0, 1), 0, NULL, 0);
 350         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 351         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 352         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, r0, NULL, 0);
 353         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 354         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 355
 356         pc = (pc & 2) >> 1;
 357         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7e9 + pc), 0, NULL, 0);
 358         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 1);
 359
 360         /* need BYPASS before RESTART */
 361         jtag_add_end_state(TAP_RTI);
 362         arm_jtag_set_instr(jtag_info, 0xf, NULL);
 363 }
 364
 365 int feroceon_read_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 *value)
 366 {
 367         armv4_5_common_t *armv4_5 = target->arch_info;
 368         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 369         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 370         int err;
 371
 372         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRC(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 373         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 374         err = arm7_9_execute_sys_speed(target);
 375         if (err != ERROR_OK)
 376                 return err;
 377
 378         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 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, value, 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         return jtag_execute_queue();
 385 }
 386
 387 int feroceon_write_cp15(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u32 value)
 388 {
 389         armv4_5_common_t *armv4_5 = target->arch_info;
 390         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 391         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 392
 393         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 1, 0, 0), 0, NULL, 0);
 394         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 395         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 396         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, value, NULL, 0);
 397         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 398         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 399         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 400
 401         arm9tdmi_clock_out(jtag_info, ARMV4_5_MCR(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 402         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 403         return arm7_9_execute_sys_speed(target);
 404 }
 405
 406 void feroceon_enable_single_step(target_t *target)
 407 {
 408         armv4_5_common_t *armv4_5 = target->arch_info;
 409         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 410         u32 next_pc;
 411
 412         /* calculate PC of next instruction */
 413         if (arm_simulate_step(target, &next_pc) != ERROR_OK)
 414         {
 415                 u32 current_pc, current_opcode;
 416                 current_pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 417                 target_read_u32(target, current_pc, &current_opcode);
 418                 ERROR("BUG: couldn't calculate PC of next instruction, "
 419                       "current opcode is 0x%8.8x", current_opcode);
 420                 next_pc = current_pc;
 421         }
 422         arm7_9_restore_context(target);
 423
 424         /* set a breakpoint there */
 425         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], next_pc);
 426         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0);
 427         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
 428         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
 429         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
 430 }
 431
 432 void feroceon_disable_single_step(target_t *target)
 433 {
 434         armv4_5_common_t *armv4_5 = target->arch_info;
 435         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 436
 437         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE]);
 438         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
 439         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
 440         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
 441         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
 442 }
 443
 444 int feroceon_examine_debug_reason(target_t *target)
 445 {
 446         /* the MOE is not implemented */
 447         if (target->debug_reason != DBG_REASON_SINGLESTEP)
 448         {
 449                 target->debug_reason = DBG_REASON_DBGRQ;
 450         }
 451
 452         return ERROR_OK;
 453 }
 454
 455 int feroceon_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
 456 {
 457         armv4_5_common_t *armv4_5 = target->arch_info;
 458         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 459         enum armv4_5_state core_state = armv4_5->core_state;
 460         u32 x, flip, shift, save[7];
 461         int i;
 462
 463         /*
 464          * We can't use the dcc flow control bits, so let's transfer data
 465          * with 31 bits and flip the MSB each time a new data word is sent.
 466          */
 467         static u32 dcc_code[] =
 468         {
 469                 0xee115e10,     /* 3:   mrc     p14, 0, r5, c1, c0, 0   */
 470                 0xe3a0301e,     /* 1:   mov     r3, #30                 */
 471                 0xe3a04002,     /*      mov     r4, #2                  */
 472                 0xee111e10,     /* 2:   mrc     p14, 0, r1, c1, c0, 0   */
 473                 0xe1310005,     /*      teq     r1, r5                  */
 474                 0x0afffffc,     /*      beq     1b                      */
 475                 0xe1a05001,     /*      mov     r5, r1                  */
 476                 0xe1a01081,     /*      mov     r1, r1, lsl #1          */
 477                 0xee112e10,     /* 3:   mrc     p14, 0, r2, c1, c0, 0   */
 478                 0xe1320005,     /*      teq     r2, r5                  */
 479                 0x0afffffc,     /*      beq     3b                      */
 480                 0xe1a05002,     /*      mov     r5, r2                  */
 481                 0xe3c22102,     /*      bic     r2, r2, #0x80000000     */
 482                 0xe1811332,     /*      orr     r1, r1, r2, lsr r3      */
 483                 0xe2533001,     /*      subs    r3, r3, #1              */
 484                 0xe4801004,     /*      str     r1, [r0], #4            */
 485                 0xe1a01412,     /*      mov     r1, r2, lsl r4          */
 486                 0xe2844001,     /*      add     r4, r4, #1              */
 487                 0x4affffed,     /*      bmi     1b                      */
 488                 0xeafffff3,     /*      b       3b                      */
 489         };
 490
 491         int dcc_size = sizeof(dcc_code);
 492
 493         if (!arm7_9->dcc_downloads)
 494                 return target->type->write_memory(target, address, 4, count, buffer);
 495
 496         /* regrab previously allocated working_area, or allocate a new one */
 497         if (!arm7_9->dcc_working_area)
 498         {
 499                 u8 dcc_code_buf[dcc_size];
 500
 501                 /* make sure we have a working area */
 502                 if (target_alloc_working_area(target, dcc_size, &arm7_9->dcc_working_area) != ERROR_OK)
 503                 {
 504                         INFO("no working area available, falling back to memory writes");
 505                         return target->type->write_memory(target, address, 4, count, buffer);
 506                 }
 507
 508                 /* copy target instructions to target endianness */
 509                 for (i = 0; i < dcc_size/4; i++)
 510                         target_buffer_set_u32(target, dcc_code_buf + i*4, dcc_code[i]);
 511
 512                 /* write DCC code to working area */
 513                 target->type->write_memory(target, arm7_9->dcc_working_area->address, 4, dcc_size, dcc_code_buf);
 514         }
 515
 516         /* backup clobbered processor state */
 517         for (i = 0; i <= 5; i++)
 518                 save[i] = buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32);
 519         save[i] = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 520
 521         /* set up target address in r0 */
 522         buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, address);
 523         armv4_5->core_cache->reg_list[0].valid = 1;
 524         armv4_5->core_cache->reg_list[0].dirty = 1;
 525         armv4_5->core_state = ARMV4_5_STATE_ARM;
 526
 527         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], 0);
 528         arm7_9_resume(target, 0, arm7_9->dcc_working_area->address, 1, 1);
 529
 530         /* send data over */
 531         x = 0;
 532         flip = 0;
 533         shift = 1;
 534         for (i = 0; i < count; i++)
 535         {
 536                 u32 y = target_buffer_get_u32(target, buffer);
 537                 u32 z = (x >> 1) | (y >> shift) | (flip ^= 0x80000000);
 538                 embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 539                 x = y << (32 - shift);
 540                 if (++shift >= 32 || i + 1 >= count)
 541                 {
 542                         z = (x >> 1) | (flip ^= 0x80000000);
 543                         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 544                         x = 0;
 545                         shift = 1;
 546                 }
 547                 buffer += 4;
 548         }
 549
 550         target->type->halt(target);
 551         while (target->state != TARGET_HALTED)
 552                 target->type->poll(target);
 553
 554         /* restore target state */
 555         for (i = 0; i <= 5; i++)
 556         {
 557                 buf_set_u32(armv4_5->core_cache->reg_list[i].value, 0, 32, save[i]);
 558                 armv4_5->core_cache->reg_list[i].valid = 1;
 559                 armv4_5->core_cache->reg_list[i].dirty = 1;
 560         }
 561         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, save[i]);
 562         armv4_5->core_cache->reg_list[15].valid = 1;
 563         armv4_5->core_cache->reg_list[15].dirty = 1;
 564         armv4_5->core_state = core_state;
 565
 566         return ERROR_OK;
 567 }
 568
 569 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 570 {
 571         armv4_5_common_t *armv4_5;
 572         arm7_9_common_t *arm7_9;
 573
 574         arm9tdmi_init_target(cmd_ctx, target);
 575
 576         armv4_5 = target->arch_info;
 577         arm7_9 = armv4_5->arch_info;
 578
 579         /* the COMMS_CTRL bits are all contiguous */
 580         if (buf_get_u32(arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL].value, 2, 4) != 6)
 581                 ERROR("unexpected Feroceon EICE version signature");
 582
 583         arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].size = 6;
 584         arm7_9->eice_cache->reg_list[EICE_DBG_STAT].size = 5;
 585         arm7_9->has_monitor_mode = 1;
 586
 587         /* vector catch reg is not initialized on reset */
 588         embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0);
 589
 590         /* clear monitor mode, enable comparators */
 591         embeddedice_read_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 592         jtag_execute_queue();
 593         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 4, 1, 0);
 594         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 5, 1, 0);
 595         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 596
 597         return ERROR_OK;
 598 }
 599
 600 int feroceon_quit()
 601 {
 602         return ERROR_OK;
 603 }
 604
 605 int feroceon_target_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct target_s *target)
 606 {
 607         int chain_pos;
 608         char *variant = NULL;
 609         armv4_5_common_t *armv4_5;
 610         arm7_9_common_t *arm7_9;
 611         arm926ejs_common_t *arm926ejs = malloc(sizeof(arm926ejs_common_t));
 612         memset(arm926ejs, 0, sizeof(*arm926ejs));
 613
 614         if (argc < 4)
 615         {
 616                 ERROR("'target arm926ejs' requires at least one additional argument");
 617                 exit(-1);
 618         }
 619
 620         chain_pos = strtoul(args[3], NULL, 0);
 621
 622         if (argc >= 5)
 623                 variant = args[4];
 624
 625         DEBUG("chain_pos: %i, variant: %s", chain_pos, variant);
 626
 627         arm926ejs_init_arch_info(target, arm926ejs, chain_pos, variant);
 628
 629         armv4_5 = target->arch_info;
 630         arm7_9 = armv4_5->arch_info;
 631
 632         /* override some insn sequence functions */
 633         arm7_9->change_to_arm = feroceon_change_to_arm;
 634         arm7_9->read_core_regs = feroceon_read_core_regs;
 635         arm7_9->read_core_regs_target_buffer = feroceon_read_core_regs_target_buffer;
 636         arm7_9->read_xpsr = feroceon_read_xpsr;
 637         arm7_9->write_xpsr = feroceon_write_xpsr;
 638         arm7_9->write_xpsr_im8 = feroceon_write_xpsr_im8;
 639         arm7_9->write_core_regs = feroceon_write_core_regs;
 640         arm7_9->branch_resume = feroceon_branch_resume;
 641         arm7_9->branch_resume_thumb = feroceon_branch_resume_thumb;
 642
 643         /* must be implemented with only one comparator */
 644         arm7_9->enable_single_step = feroceon_enable_single_step;
 645         arm7_9->disable_single_step = feroceon_disable_single_step;
 646
 647         /* MOE is not implemented */
 648         arm7_9->examine_debug_reason = feroceon_examine_debug_reason;
 649
 650         /* the standard ARM926 methods don't always work (don't ask...) */
 651         arm926ejs->read_cp15 = feroceon_read_cp15;
 652         arm926ejs->write_cp15 = feroceon_write_cp15;
 653
 654         /* asserting DBGRQ won't win over the undef exception */
 655         arm7_9->use_dbgrq = 0;
 656
 657         /* only one working comparator */
 658         arm7_9->wp_available = 1;
 659         arm7_9->wp1_used = -1;
 660
 661         return ERROR_OK;
 662 }