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
  30
  31 #if 0
  32 #define _DEBUG_INSTRUCTION_EXECUTION_
  33 #endif
  34
  35 int arm966e_init_arch_info(target_t *target, arm966e_common_t *arm966e, jtag_tap_t *tap)
  36 {
  37         arm9tdmi_common_t *arm9tdmi = &arm966e->arm9tdmi_common;
  38         arm7_9_common_t *arm7_9 = &arm9tdmi->arm7_9_common;
  39
  40         arm9tdmi_init_arch_info(target, arm9tdmi, tap);
  41
  42         arm966e->common_magic = ARM966E_COMMON_MAGIC;
  43
  44         /* The ARM966E-S implements the ARMv5TE architecture which
  45          * has the BKPT instruction, so we don't have to use a watchpoint comparator
  46          */
  47         arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
  48         arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
  49
  50         return ERROR_OK;
  51 }
  52
  53 static int arm966e_target_create(struct target_s *target, Jim_Interp *interp)
  54 {
  55         arm966e_common_t *arm966e = calloc(1,sizeof(arm966e_common_t));
  56
  57         return arm966e_init_arch_info(target, arm966e, target->tap);
  58 }
  59
  60 static int arm966e_verify_pointer(struct command_context_s *cmd_ctx,
  61                 struct arm966e_common_s *arm966e)
  62 {
  63         if (arm966e->common_magic != ARM966E_COMMON_MAGIC) {
  64                 command_print(cmd_ctx, "target is not an ARM966");
  65                 return ERROR_TARGET_INVALID;
  66         }
  67         return ERROR_OK;
  68 }
  69
  70 static int arm966e_read_cp15(target_t *target, int reg_addr, uint32_t *value)
  71 {
  72         int retval = ERROR_OK;
  73         struct arm7_9_common_s *arm7_9 = target_to_arm7_9(target);
  74         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
  75         scan_field_t fields[3];
  76         uint8_t reg_addr_buf = reg_addr & 0x3f;
  77         uint8_t nr_w_buf = 0;
  78
  79         jtag_set_end_state(TAP_IDLE);
  80         if ((retval = arm_jtag_scann(jtag_info, 0xf)) != ERROR_OK)
  81         {
  82                 return retval;
  83         }
  84         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
  85
  86         fields[0].tap = jtag_info->tap;
  87         fields[0].num_bits = 32;
  88         fields[0].out_value = NULL;
  89         fields[0].in_value = NULL;
  90
  91         fields[1].tap = jtag_info->tap;
  92         fields[1].num_bits = 6;
  93         fields[1].out_value = &reg_addr_buf;
  94         fields[1].in_value = NULL;
  95
  96         fields[2].tap = jtag_info->tap;
  97         fields[2].num_bits = 1;
  98         fields[2].out_value = &nr_w_buf;
  99         fields[2].in_value = NULL;
 100
 101         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 102
 103         fields[1].in_value = (uint8_t *)value;
 104
 105         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 106
 107         jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 108
 109
 110 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 111         if ((retval = jtag_execute_queue()) != ERROR_OK)
 112         {
 113                 return retval;
 114         }
 115         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, *value);
 116 #endif
 117
 118         return ERROR_OK;
 119 }
 120
 121 // EXPORTED to str9x (flash)
 122 int arm966e_write_cp15(target_t *target, int reg_addr, uint32_t value)
 123 {
 124         int retval = ERROR_OK;
 125         struct arm7_9_common_s *arm7_9 = target_to_arm7_9(target);
 126         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 127         scan_field_t fields[3];
 128         uint8_t reg_addr_buf = reg_addr & 0x3f;
 129         uint8_t nr_w_buf = 1;
 130         uint8_t value_buf[4];
 131
 132         buf_set_u32(value_buf, 0, 32, value);
 133
 134         jtag_set_end_state(TAP_IDLE);
 135         if ((retval = arm_jtag_scann(jtag_info, 0xf)) != ERROR_OK)
 136         {
 137                 return retval;
 138         }
 139         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 140
 141         fields[0].tap = jtag_info->tap;
 142         fields[0].num_bits = 32;
 143         fields[0].out_value = value_buf;
 144         fields[0].in_value = NULL;
 145
 146         fields[1].tap = jtag_info->tap;
 147         fields[1].num_bits = 6;
 148         fields[1].out_value = &reg_addr_buf;
 149         fields[1].in_value = NULL;
 150
 151         fields[2].tap = jtag_info->tap;
 152         fields[2].num_bits = 1;
 153         fields[2].out_value = &nr_w_buf;
 154         fields[2].in_value = NULL;
 155
 156         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 157
 158 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
 159         LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, value);
 160 #endif
 161
 162         return ERROR_OK;
 163 }
 164
 165 static int arm966e_handle_cp15_command(struct command_context_s *cmd_ctx,
 166                 char *cmd, char **args, int argc)
 167 {
 168         int retval;
 169         target_t *target = get_current_target(cmd_ctx);
 170         struct arm966e_common_s *arm966e = target_to_arm966(target);
 171
 172         retval = arm966e_verify_pointer(cmd_ctx, arm966e);
 173         if (retval != ERROR_OK)
 174                 return retval;
 175
 176         if (target->state != TARGET_HALTED)
 177         {
 178                 command_print(cmd_ctx, "target must be stopped for \"%s\" command", cmd);
 179                 return ERROR_OK;
 180         }
 181
 182         /* one or more argument, access a single register (write if second argument is given */
 183         if (argc >= 1)
 184         {
 185                 uint32_t address;
 186                 COMMAND_PARSE_NUMBER(u32, args[0], address);
 187
 188                 if (argc == 1)
 189                 {
 190                         uint32_t value;
 191                         if ((retval = arm966e_read_cp15(target, address, &value)) != ERROR_OK)
 192                         {
 193                                 command_print(cmd_ctx, "couldn't access reg %i", address);
 194                                 return ERROR_OK;
 195                         }
 196                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 197                         {
 198                                 return retval;
 199                         }
 200
 201                         command_print(cmd_ctx, "%i: %8.8" PRIx32 "", address, value);
 202                 }
 203                 else if (argc == 2)
 204                 {
 205                         uint32_t value;
 206                         COMMAND_PARSE_NUMBER(u32, args[1], value);
 207                         if ((retval = arm966e_write_cp15(target, address, value)) != ERROR_OK)
 208                         {
 209                                 command_print(cmd_ctx, "couldn't access reg %i", address);
 210                                 return ERROR_OK;
 211                         }
 212                         command_print(cmd_ctx, "%i: %8.8" PRIx32 "", address, value);
 213                 }
 214         }
 215
 216         return ERROR_OK;
 217 }
 218
 219 /** Registers commands used to access coprocessor resources. */
 220 int arm966e_register_commands(struct command_context_s *cmd_ctx)
 221 {
 222         int retval;
 223         command_t *arm966e_cmd;
 224
 225         retval = arm9tdmi_register_commands(cmd_ctx);
 226         arm966e_cmd = register_command(cmd_ctx, NULL, "arm966e",
 227                         NULL, COMMAND_ANY,
 228                         "arm966e specific commands");
 229         register_command(cmd_ctx, arm966e_cmd, "cp15",
 230                         arm966e_handle_cp15_command, COMMAND_EXEC,
 231                         "display/modify cp15 register <num> [value]");
 232
 233         return retval;
 234 }
 235
 236 /** Holds methods for ARM966 targets. */
 237 target_type_t arm966e_target =
 238 {
 239         .name = "arm966e",
 240
 241         .poll = arm7_9_poll,
 242         .arch_state = armv4_5_arch_state,
 243
 244         .target_request_data = arm7_9_target_request_data,
 245
 246         .halt = arm7_9_halt,
 247         .resume = arm7_9_resume,
 248         .step = arm7_9_step,
 249
 250         .assert_reset = arm7_9_assert_reset,
 251         .deassert_reset = arm7_9_deassert_reset,
 252         .soft_reset_halt = arm7_9_soft_reset_halt,
 253
 254         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
 255
 256         .read_memory = arm7_9_read_memory,
 257         .write_memory = arm7_9_write_memory,
 258         .bulk_write_memory = arm7_9_bulk_write_memory,
 259         .checksum_memory = arm7_9_checksum_memory,
 260         .blank_check_memory = arm7_9_blank_check_memory,
 261
 262         .run_algorithm = armv4_5_run_algorithm,
 263
 264         .add_breakpoint = arm7_9_add_breakpoint,
 265         .remove_breakpoint = arm7_9_remove_breakpoint,
 266         .add_watchpoint = arm7_9_add_watchpoint,
 267         .remove_watchpoint = arm7_9_remove_watchpoint,
 268
 269         .register_commands = arm966e_register_commands,
 270         .target_create = arm966e_target_create,
 271         .init_target = arm9tdmi_init_target,
 272         .examine = arm9tdmi_examine,
 273 };