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, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "arm966e.h"
  27 #include "target_type.h"
  28 #include "arm_opcodes.h"
  29
  30 #if 0
  31 #define _DEBUG_INSTRUCTION_EXECUTION_
  32 #endif
  33
  34 int arm966e_init_arch_info(struct target *target, struct arm966e_common *arm966e, struct jtag_tap *tap)
  35 {
  36         struct arm7_9_common *arm7_9 = &arm966e->arm7_9_common;
  37
  38         /* initialize arm7/arm9 specific info (including armv4_5) */
  39         arm9tdmi_init_arch_info(target, arm7_9, tap);
  40
  41         arm966e->common_magic = ARM966E_COMMON_MAGIC;
  42
  43         /* The ARM966E-S implements the ARMv5TE architecture which
  44          * has the BKPT instruction, so we don't have to use a watchpoint comparator
  45          */
  46         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
  47         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
  48
  49         return ERROR_OK;
  50 }
  51
  52 static int arm966e_target_create(struct target *target, Jim_Interp *interp)
  53 {
  54         struct arm966e_common *arm966e = calloc(1, sizeof(struct arm966e_common));
  55
  56         return arm966e_init_arch_info(target, arm966e, target->tap);
  57 }
  58
  59 static int arm966e_verify_pointer(struct command_context *cmd_ctx,
  60                 struct arm966e_common *arm966e)
  61 {
  62         if (arm966e->common_magic != ARM966E_COMMON_MAGIC) {
  63                 command_print(cmd_ctx, "target is not an ARM966");
  64                 return ERROR_TARGET_INVALID;
  65         }
  66         return ERROR_OK;
  67 }
  68
  69 /*
  70  * REVISIT:  The "read_cp15" and "write_cp15" commands could hook up
  71  * to eventual mrc() and mcr() routines ... the reg_addr values being
  72  * constructed (for CP15 only) from Opcode_1, Opcode_2, and CRn values.
  73  * See section 7.3 of the ARM966E-S TRM.
  74  */
  75
  76 static int arm966e_read_cp15(struct target *target, int reg_addr, uint32_t *value)
  77 {
  78         int retval = ERROR_OK;
  79         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
  80         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
  81         struct scan_field fields[3];
  82         uint8_t reg_addr_buf = reg_addr & 0x3f;
  83         uint8_t nr_w_buf = 0;
  84
  85         retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
  86         if (retval != ERROR_OK)
  87                 return retval;
  88         retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
  89         if (retval != ERROR_OK)
  90                 return retval;
  91
  92         fields[0].num_bits = 32;
  93         /* REVISIT: table 7-2 shows that bits 31-31 need to be
  94          * specified for accessing BIST registers ...
  95          */
  96         fields[0].out_value = NULL;
  97         fields[0].in_value = NULL;
  98
  99         fields[1].num_bits = 6;
 100         fields[1].out_value = &reg_addr_buf;
 101         fields[1].in_value = NULL;
 102
 103         fields[2].num_bits = 1;
 104         fields[2].out_value = &nr_w_buf;
 105         fields[2].in_value = NULL;
 106
 107         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 108
 109         fields[1].in_value = (uint8_t *)value;
 110
 111         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 112
 113         jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 114
 115
 116 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 117         retval = jtag_execute_queue();
 118         if (retval != ERROR_OK)
 119                 return retval;
 120         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, *value);
 121 #endif
 122
 123         return ERROR_OK;
 124 }
 125
 126 /* EXPORTED to str9x (flash) */
 127 int arm966e_write_cp15(struct target *target, int reg_addr, uint32_t value)
 128 {
 129         int retval = ERROR_OK;
 130         struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
 131         struct arm_jtag *jtag_info = &arm7_9->jtag_info;
 132         struct scan_field fields[3];
 133         uint8_t reg_addr_buf = reg_addr & 0x3f;
 134         uint8_t nr_w_buf = 1;
 135         uint8_t value_buf[4];
 136
 137         buf_set_u32(value_buf, 0, 32, value);
 138
 139         retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
 140         if (retval != ERROR_OK)
 141                 return retval;
 142         retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
 143         if (retval != ERROR_OK)
 144                 return retval;
 145
 146         fields[0].num_bits = 32;
 147         fields[0].out_value = value_buf;
 148         fields[0].in_value = NULL;
 149
 150         fields[1].num_bits = 6;
 151         fields[1].out_value = &reg_addr_buf;
 152         fields[1].in_value = NULL;
 153
 154         fields[2].num_bits = 1;
 155         fields[2].out_value = &nr_w_buf;
 156         fields[2].in_value = NULL;
 157
 158         jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 159
 160 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 161         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, value);
 162 #endif
 163
 164         return ERROR_OK;
 165 }
 166
 167 COMMAND_HANDLER(arm966e_handle_cp15_command)
 168 {
 169         int retval;
 170         struct target *target = get_current_target(CMD_CTX);
 171         struct arm966e_common *arm966e = target_to_arm966(target);
 172
 173         retval = arm966e_verify_pointer(CMD_CTX, arm966e);
 174         if (retval != ERROR_OK)
 175                 return retval;
 176
 177         if (target->state != TARGET_HALTED) {
 178                 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
 179                 return ERROR_OK;
 180         }
 181
 182         /* one or more argument, access a single register (write if second argument is given */
 183         if (CMD_ARGC >= 1) {
 184                 uint32_t address;
 185                 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
 186
 187                 if (CMD_ARGC == 1) {
 188                         uint32_t value;
 189                         retval = arm966e_read_cp15(target, address, &value);
 190                         if (retval != ERROR_OK) {
 191                                 command_print(CMD_CTX,
 192                                                 "couldn't access reg %" PRIi32,
 193                                                 address);
 194                                 return ERROR_OK;
 195                         }
 196                         retval = jtag_execute_queue();
 197                         if (retval != ERROR_OK)
 198                                 return retval;
 199
 200                         command_print(CMD_CTX, "%" PRIi32 ": %8.8" PRIx32,
 201                                         address, value);
 202                 } else if (CMD_ARGC == 2) {
 203                         uint32_t value;
 204                         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
 205                         retval = arm966e_write_cp15(target, address, value);
 206                         if (retval != ERROR_OK) {
 207                                 command_print(CMD_CTX,
 208                                                 "couldn't access reg %" PRIi32,
 209                                                 address);
 210                                 return ERROR_OK;
 211                         }
 212                         command_print(CMD_CTX, "%" PRIi32 ": %8.8" PRIx32,
 213                                         address, value);
 214                 }
 215         }
 216
 217         return ERROR_OK;
 218 }
 219
 220 static const struct command_registration arm966e_exec_command_handlers[] = {
 221         {
 222                 .name = "cp15",
 223                 .handler = arm966e_handle_cp15_command,
 224                 .mode = COMMAND_EXEC,
 225                 .usage = "regnum [value]",
 226                 .help = "display/modify cp15 register",
 227         },
 228         COMMAND_REGISTRATION_DONE
 229 };
 230
 231 const struct command_registration arm966e_command_handlers[] = {
 232         {
 233                 .chain = arm9tdmi_command_handlers,
 234         },
 235         {
 236                 .name = "arm966e",
 237                 .mode = COMMAND_ANY,
 238                 .help = "arm966e command group",
 239                 .usage = "",
 240                 .chain = arm966e_exec_command_handlers,
 241         },
 242         COMMAND_REGISTRATION_DONE
 243 };
 244
 245 /** Holds methods for ARM966 targets. */
 246 struct target_type arm966e_target = {
 247         .name = "arm966e",
 248
 249         .poll = arm7_9_poll,
 250         .arch_state = arm_arch_state,
 251
 252         .target_request_data = arm7_9_target_request_data,
 253
 254         .halt = arm7_9_halt,
 255         .resume = arm7_9_resume,
 256         .step = arm7_9_step,
 257
 258         .assert_reset = arm7_9_assert_reset,
 259         .deassert_reset = arm7_9_deassert_reset,
 260         .soft_reset_halt = arm7_9_soft_reset_halt,
 261
 262         .get_gdb_reg_list = arm_get_gdb_reg_list,
 263
 264         .read_memory = arm7_9_read_memory,
 265         .write_memory = arm7_9_write_memory_opt,
 266
 267         .checksum_memory = arm_checksum_memory,
 268         .blank_check_memory = arm_blank_check_memory,
 269
 270         .run_algorithm = armv4_5_run_algorithm,
 271
 272         .add_breakpoint = arm7_9_add_breakpoint,
 273         .remove_breakpoint = arm7_9_remove_breakpoint,
 274         .add_watchpoint = arm7_9_add_watchpoint,
 275         .remove_watchpoint = arm7_9_remove_watchpoint,
 276
 277         .commands = arm966e_command_handlers,
 278         .target_create = arm966e_target_create,
 279         .init_target = arm9tdmi_init_target,
 280         .examine = arm7_9_examine,
 281         .check_reset = arm7_9_check_reset,
 282 };