src/target/arm966e.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   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 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "arm966e.h"
  28 #include "target_type.h"
  29 #include "arm_opcodes.h"
  30
  31
  32 #if 0
  33 #define _DEBUG_INSTRUCTION_EXECUTION_
  34 #endif
  35
  36 int arm966e_init_arch_info(struct target *target, struct arm966e_common *arm966e, struct jtag_tap *tap)
  37 {
  38         struct arm7_9_common *arm7_9 = &arm966e->arm7_9_common;
  39
  40         /* initialize arm7/arm9 specific info (including armv4_5) */
  41         arm9tdmi_init_arch_info(target, arm7_9, tap);
  42
  43         arm966e->common_magic = ARM966E_COMMON_MAGIC;
  44
  45         /* The ARM966E-S implements the ARMv5TE architecture which
  46          * has the BKPT instruction, so we don't have to use a watchpoint comparator
  47          */
  48         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
  49         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
  50
  51         return ERROR_OK;
  52 }
  53
  54 static int arm966e_target_create(struct target *target, Jim_Interp *interp)
  55 {
  56         struct arm966e_common *arm966e = calloc(1,sizeof(struct arm966e_common));
  57
  58         return arm966e_init_arch_info(target, arm966e, target->tap);
  59 }
  60
  61 static int arm966e_verify_pointer(struct command_context *cmd_ctx,
  62                 struct arm966e_common *arm966e)
  63 {
  64         if (arm966e->common_magic != ARM966E_COMMON_MAGIC) {
  65                 command_print(cmd_ctx, "target is not an ARM966");
  66                 return ERROR_TARGET_INVALID;
  67         }
  68         return ERROR_OK;
  69 }
  70
  71 /*
  72  * REVISIT:  The "read_cp15" and "write_cp15" commands could hook up
  73  * to eventual mrc() and mcr() routines ... the reg_addr values being
  74  * constructed (for CP15 only) from Opcode_1, Opcode_2, and CRn values.
  75  * See section 7.3 of the ARM966E-S TRM.
  76  */
  77
  78 static int arm966e_read_cp15(struct target *target, int reg_addr, uint32_t *value)
  79 {
  80         int retval = ERROR_OK;
  81         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  82         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
  83         struct scan_field fields[3];
  84         uint8_t reg_addr_buf = reg_addr & 0x3f;
  85         uint8_t nr_w_buf = 0;
  86
  87         if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
  88         {
  89                 return retval;
  90         }
  91         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
  92         if (retval != ERROR_OK)
  93                 return retval;
  94
  95         fields[0].num_bits = 32;
  96         /* REVISIT: table 7-2 shows that bits 31-31 need to be
  97          * specified for accessing BIST registers ...
  98          */
  99         fields[0].out_value = NULL;
 100         fields[0].in_value = NULL;
 101
 102         fields[1].num_bits = 6;
 103         fields[1].out_value = &reg_addr_buf;
 104         fields[1].in_value = NULL;
 105
 106         fields[2].num_bits = 1;
 107         fields[2].out_value = &nr_w_buf;
 108         fields[2].in_value = NULL;
 109
 110         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 111
 112         fields[1].in_value = (uint8_t *)value;
 113
 114         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 115
 116         jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 117
 118
 119 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 120         if ((retval = jtag_execute_queue()) != ERROR_OK)
 121         {
 122                 return retval;
 123         }
 124         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, *value);
 125 #endif
 126
 127         return ERROR_OK;
 128 }
 129
 130 // EXPORTED to str9x (flash)
 131 int arm966e_write_cp15(struct target *target, int reg_addr, uint32_t value)
 132 {
 133         int retval = ERROR_OK;
 134         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 135         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 136         struct scan_field fields[3];
 137         uint8_t reg_addr_buf = reg_addr & 0x3f;
 138         uint8_t nr_w_buf = 1;
 139         uint8_t value_buf[4];
 140
 141         buf_set_u32(value_buf, 0, 32, value);
 142
 143         if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
 144         {
 145                 return retval;
 146         }
 147         retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
 148         if (retval != ERROR_OK)
 149                 return retval;
 150
 151         fields[0].num_bits = 32;
 152         fields[0].out_value = value_buf;
 153         fields[0].in_value = NULL;
 154
 155         fields[1].num_bits = 6;
 156         fields[1].out_value = &reg_addr_buf;
 157         fields[1].in_value = NULL;
 158
 159         fields[2].num_bits = 1;
 160         fields[2].out_value = &nr_w_buf;
 161         fields[2].in_value = NULL;
 162
 163         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 164
 165 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 166         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, value);
 167 #endif
 168
 169         return ERROR_OK;
 170 }
 171
 172 COMMAND_HANDLER(arm966e_handle_cp15_command)
 173 {
 174         int retval;
 175         struct target *target = get_current_target(CMD_CTX);
 176         struct arm966e_common *arm966e = target_to_arm966(target);
 177
 178         retval = arm966e_verify_pointer(CMD_CTX, arm966e);
 179         if (retval != ERROR_OK)
 180                 return retval;
 181
 182         if (target->state != TARGET_HALTED)
 183         {
 184                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
 185                 return ERROR_OK;
 186         }
 187
 188         /* one or more argument, access a single register (write if second argument is given */
 189         if (CMD_ARGC >= 1)
 190         {
 191                 uint32_t address;
 192                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
 193
 194                 if (CMD_ARGC == 1)
 195                 {
 196                         uint32_t value;
 197                         if ((retval = arm966e_read_cp15(target, address, &value)) != ERROR_OK)
 198                         {
 199                                 command_print(CMD_CTX,
 200                                                 "couldn't access reg %" PRIi32,
 201                                                 address);
 202                                 return ERROR_OK;
 203                         }
 204                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 205                         {
 206                                 return retval;
 207                         }
 208
 209                         command_print(CMD_CTX, "%" PRIi32 ": %8.8" PRIx32,
 210                                         address, value);
 211                 }
 212                 else if (CMD_ARGC == 2)
 213                 {
 214                         uint32_t value;
 215                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
 216                         if ((retval = arm966e_write_cp15(target, address, value)) != ERROR_OK)
 217                         {
 218                                 command_print(CMD_CTX,
 219                                                 "couldn't access reg %" PRIi32,
 220                                                 address);
 221                                 return ERROR_OK;
 222                         }
 223                         command_print(CMD_CTX, "%" PRIi32 ": %8.8" PRIx32,
 224                                         address, value);
 225                 }
 226         }
 227
 228         return ERROR_OK;
 229 }
 230
 231 static const struct command_registration arm966e_exec_command_handlers[] = {
 232         {
 233                 .name = "cp15",
 234                 .handler = arm966e_handle_cp15_command,
 235                 .mode = COMMAND_EXEC,
 236                 .usage = "regnum [value]",
 237                 .help = "display/modify cp15 register",
 238         },
 239         COMMAND_REGISTRATION_DONE
 240 };
 241
 242 const struct command_registration arm966e_command_handlers[] = {
 243         {
 244                 .chain = arm9tdmi_command_handlers,
 245         },
 246         {
 247                 .name = "arm966e",
 248                 .mode = COMMAND_ANY,
 249                 .help = "arm966e command group",
 250                 .chain = arm966e_exec_command_handlers,
 251         },
 252         COMMAND_REGISTRATION_DONE
 253 };
 254
 255 /** Holds methods for ARM966 targets. */
 256 struct target_type arm966e_target =
 257 {
 258         .name = "arm966e",
 259
 260         .poll = arm7_9_poll,
 261         .arch_state = arm_arch_state,
 262
 263         .target_request_data = arm7_9_target_request_data,
 264
 265         .halt = arm7_9_halt,
 266         .resume = arm7_9_resume,
 267         .step = arm7_9_step,
 268
 269         .assert_reset = arm7_9_assert_reset,
 270         .deassert_reset = arm7_9_deassert_reset,
 271         .soft_reset_halt = arm7_9_soft_reset_halt,
 272
 273         .get_gdb_reg_list = arm_get_gdb_reg_list,
 274
 275         .read_memory = arm7_9_read_memory,
 276         .write_memory = arm7_9_write_memory,
 277         .bulk_write_memory = arm7_9_bulk_write_memory,
 278
 279         .checksum_memory = arm_checksum_memory,
 280         .blank_check_memory = arm_blank_check_memory,
 281
 282         .run_algorithm = armv4_5_run_algorithm,
 283
 284         .add_breakpoint = arm7_9_add_breakpoint,
 285         .remove_breakpoint = arm7_9_remove_breakpoint,
 286         .add_watchpoint = arm7_9_add_watchpoint,
 287         .remove_watchpoint = arm7_9_remove_watchpoint,
 288
 289         .commands = arm966e_command_handlers,
 290         .target_create = arm966e_target_create,
 291         .init_target = arm9tdmi_init_target,
 292         .examine = arm7_9_examine,
 293         .check_reset = arm7_9_check_reset,
 294 };