src/target/armv7a.c

   1 /***************************************************************************
   2  *    Copyright (C) 2009 by David Brownell                                 *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include "replacements.h"
  24
  25 #include "armv7a.h"
  26 #include "arm_disassembler.h"
  27
  28 #include "target.h"
  29 #include "register.h"
  30 #include "binarybuffer.h"
  31 #include "command.h"
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37
  38 char* armv7a_core_reg_list[] =
  39 {
  40         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  41         "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
  42         "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
  43         "r13_irq", "lr_irq",
  44         "r13_svc", "lr_svc",
  45         "r13_abt", "lr_abt",
  46         "r13_und", "lr_und",
  47         "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und",
  48         "r13_mon", "lr_mon", "spsr_mon"
  49 };
  50
  51 char * armv7a_mode_strings_list[] =
  52 {
  53         "Illegal mode value", "User", "FIQ", "IRQ",
  54         "Supervisor", "Abort", "Undefined", "System", "Monitor"
  55 };
  56
  57 /* Hack! Yuk! allow -1 index, which simplifies codepaths elsewhere in the code */
  58 char** armv7a_mode_strings = armv7a_mode_strings_list+1;
  59
  60 char* armv7a_state_strings[] =
  61 {
  62         "ARM", "Thumb", "Jazelle", "ThumbEE"
  63 };
  64
  65 struct armv7a_core_reg armv7a_core_reg_list_arch_info[] =
  66 {
  67         {0, ARMV4_5_MODE_ANY, NULL, NULL},
  68         {1, ARMV4_5_MODE_ANY, NULL, NULL},
  69         {2, ARMV4_5_MODE_ANY, NULL, NULL},
  70         {3, ARMV4_5_MODE_ANY, NULL, NULL},
  71         {4, ARMV4_5_MODE_ANY, NULL, NULL},
  72         {5, ARMV4_5_MODE_ANY, NULL, NULL},
  73         {6, ARMV4_5_MODE_ANY, NULL, NULL},
  74         {7, ARMV4_5_MODE_ANY, NULL, NULL},
  75         {8, ARMV4_5_MODE_ANY, NULL, NULL},
  76         {9, ARMV4_5_MODE_ANY, NULL, NULL},
  77         {10, ARMV4_5_MODE_ANY, NULL, NULL},
  78         {11, ARMV4_5_MODE_ANY, NULL, NULL},
  79         {12, ARMV4_5_MODE_ANY, NULL, NULL},
  80         {13, ARMV4_5_MODE_USR, NULL, NULL},
  81         {14, ARMV4_5_MODE_USR, NULL, NULL},
  82         {15, ARMV4_5_MODE_ANY, NULL, NULL},
  83
  84         {8, ARMV4_5_MODE_FIQ, NULL, NULL},
  85         {9, ARMV4_5_MODE_FIQ, NULL, NULL},
  86         {10, ARMV4_5_MODE_FIQ, NULL, NULL},
  87         {11, ARMV4_5_MODE_FIQ, NULL, NULL},
  88         {12, ARMV4_5_MODE_FIQ, NULL, NULL},
  89         {13, ARMV4_5_MODE_FIQ, NULL, NULL},
  90         {14, ARMV4_5_MODE_FIQ, NULL, NULL},
  91
  92         {13, ARMV4_5_MODE_IRQ, NULL, NULL},
  93         {14, ARMV4_5_MODE_IRQ, NULL, NULL},
  94
  95         {13, ARMV4_5_MODE_SVC, NULL, NULL},
  96         {14, ARMV4_5_MODE_SVC, NULL, NULL},
  97
  98         {13, ARMV4_5_MODE_ABT, NULL, NULL},
  99         {14, ARMV4_5_MODE_ABT, NULL, NULL},
 100
 101         {13, ARMV4_5_MODE_UND, NULL, NULL},
 102         {14, ARMV4_5_MODE_UND, NULL, NULL},
 103
 104         {16, ARMV4_5_MODE_ANY, NULL, NULL},
 105         {16, ARMV4_5_MODE_FIQ, NULL, NULL},
 106         {16, ARMV4_5_MODE_IRQ, NULL, NULL},
 107         {16, ARMV4_5_MODE_SVC, NULL, NULL},
 108         {16, ARMV4_5_MODE_ABT, NULL, NULL},
 109         {16, ARMV4_5_MODE_UND, NULL, NULL},
 110
 111         {13, ARMV7A_MODE_MON, NULL, NULL},
 112         {14, ARMV7A_MODE_MON, NULL, NULL},
 113         {16, ARMV7A_MODE_MON, NULL, NULL}
 114 };
 115
 116 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
 117 int armv7a_core_reg_map[8][17] =
 118 {
 119         {       /* USR */
 120                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 121         },
 122         {       /* FIQ */
 123                 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
 124         },
 125         {       /* IRQ */
 126                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
 127         },
 128         {       /* SVC */
 129                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
 130         },
 131         {       /* ABT */
 132                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
 133         },
 134         {       /* UND */
 135                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
 136         },
 137         {       /* SYS */
 138                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 139         },
 140         {       /* MON */
 141                 /* TODO Fix the register mapping for mon, we need r13_mon,
 142                  * r14_mon and spsr_mon
 143                  */
 144                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 145         }
 146 };
 147
 148 /* FIXME this dummy is IDENTICAL to the armv4_5, arm11, and armv7m
 149  * ones... except for naming/scoping
 150  */
 151 uint8_t armv7a_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 152
 153 struct reg armv7a_gdb_dummy_fp_reg =
 154 {
 155         .name = "GDB dummy floating-point register",
 156         .value = armv7a_gdb_dummy_fp_value,
 157         .dirty = 0,
 158         .valid = 1,
 159         .size = 96,
 160         .arch_info = NULL,
 161         .arch_type = 0,
 162 };
 163
 164 void armv7a_show_fault_registers(struct target *target)
 165 {
 166         uint32_t dfsr, ifsr, dfar, ifar;
 167         struct armv7a_common *armv7a = target_to_armv7a(target);
 168
 169         armv7a->read_cp15(target, 0, 0, 5, 0, &dfsr);
 170         armv7a->read_cp15(target, 0, 1, 5, 0, &ifsr);
 171         armv7a->read_cp15(target, 0, 0, 6, 0, &dfar);
 172         armv7a->read_cp15(target, 0, 2, 6, 0, &ifar);
 173
 174         LOG_USER("Data fault registers        DFSR: %8.8" PRIx32
 175                         ", DFAR: %8.8" PRIx32, dfsr, dfar);
 176         LOG_USER("Instruction fault registers IFSR: %8.8" PRIx32
 177                         ", IFAR: %8.8" PRIx32, ifsr, ifar);
 178
 179 }
 180
 181 int armv7a_arch_state(struct target *target)
 182 {
 183         static const char *state[] =
 184         {
 185                 "disabled", "enabled"
 186         };
 187
 188         struct armv7a_common *armv7a = target_to_armv7a(target);
 189         struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
 190
 191         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 192         {
 193                 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
 194                 exit(-1);
 195         }
 196
 197         LOG_USER("target halted in %s state due to %s, current mode: %s\n"
 198                          "%s: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "\n"
 199                          "MMU: %s, D-Cache: %s, I-Cache: %s",
 200                  armv7a_state_strings[armv7a->core_state],
 201                  Jim_Nvp_value2name_simple(nvp_target_debug_reason,
 202                                 target->debug_reason)->name,
 203                  armv7a_mode_strings[
 204                         armv7a_mode_to_number(armv4_5->core_mode)],
 205                  armv7a_core_reg_list[armv7a_core_reg_map[
 206                         armv7a_mode_to_number(armv4_5->core_mode)][16]],
 207                  buf_get_u32(ARMV7A_CORE_REG_MODE(armv4_5->core_cache,
 208                                 armv4_5->core_mode, 16).value, 0, 32),
 209                  buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 210                  state[armv7a->armv4_5_mmu.mmu_enabled],
 211                  state[armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 212                  state[armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 213
 214         if (armv4_5->core_mode == ARMV7A_MODE_ABT)
 215                 armv7a_show_fault_registers(target);
 216
 217         return ERROR_OK;
 218 }
 219
 220
 221 COMMAND_HANDLER(handle_dap_baseaddr_command)
 222 {
 223         struct target *target = get_current_target(cmd_ctx);
 224         struct armv7a_common *armv7a = target_to_armv7a(target);
 225         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 226
 227         return CALL_COMMAND_HANDLER(dap_baseaddr_command, swjdp);
 228 }
 229
 230 COMMAND_HANDLER(handle_dap_memaccess_command)
 231 {
 232         struct target *target = get_current_target(cmd_ctx);
 233         struct armv7a_common *armv7a = target_to_armv7a(target);
 234         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 235
 236         return CALL_COMMAND_HANDLER(dap_memaccess_command, swjdp);
 237 }
 238
 239 COMMAND_HANDLER(handle_dap_apsel_command)
 240 {
 241         struct target *target = get_current_target(cmd_ctx);
 242         struct armv7a_common *armv7a = target_to_armv7a(target);
 243         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 244
 245         return CALL_COMMAND_HANDLER(dap_apsel_command, swjdp);
 246 }
 247
 248 COMMAND_HANDLER(handle_dap_apid_command)
 249 {
 250         struct target *target = get_current_target(cmd_ctx);
 251         struct armv7a_common *armv7a = target_to_armv7a(target);
 252         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 253
 254         return CALL_COMMAND_HANDLER(dap_apid_command, swjdp);
 255 }
 256
 257 COMMAND_HANDLER(handle_dap_info_command)
 258 {
 259         struct target *target = get_current_target(cmd_ctx);
 260         struct armv7a_common *armv7a = target_to_armv7a(target);
 261         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 262         uint32_t apsel;
 263
 264         switch (argc) {
 265         case 0:
 266                 apsel = swjdp->apsel;
 267                 break;
 268         case 1:
 269                 COMMAND_PARSE_NUMBER(u32, args[0], apsel);
 270                 break;
 271         default:
 272                 return ERROR_COMMAND_SYNTAX_ERROR;
 273         }
 274
 275         return dap_info_command(cmd_ctx, swjdp, apsel);
 276 }
 277
 278 COMMAND_HANDLER(handle_armv7a_disassemble_command)
 279 {
 280         struct target *target = get_current_target(cmd_ctx);
 281         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 282         int thumb = 0;
 283         int count = 1;
 284         uint32_t address;
 285         int i;
 286
 287         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC) {
 288                 command_print(cmd_ctx, "current target isn't an ARM target");
 289                 return ERROR_OK;
 290         }
 291
 292         /* REVISIT:  eventually support ThumbEE disassembly too;
 293          * some opcodes work differently.
 294          */
 295
 296         switch (argc) {
 297         case 3:
 298                 if (strcmp(args[2], "thumb") != 0)
 299                         goto usage;
 300                 thumb = 1;
 301                 /* FALL THROUGH */
 302         case 2:
 303                 COMMAND_PARSE_NUMBER(int, args[1], count);
 304                 /* FALL THROUGH */
 305         case 1:
 306                 COMMAND_PARSE_NUMBER(u32, args[0], address);
 307                 if (address & 0x01) {
 308                         if (!thumb) {
 309                                 command_print(cmd_ctx, "Disassemble as Thumb");
 310                                 thumb = 1;
 311                         }
 312                         address &= ~1;
 313                 }
 314                 break;
 315         default:
 316 usage:
 317                 command_print(cmd_ctx,
 318                         "usage: armv7a disassemble <address> [<count> ['thumb']]");
 319                 return ERROR_OK;
 320         }
 321
 322         for (i = 0; i < count; i++) {
 323                 struct arm_instruction cur_instruction;
 324                 int retval;
 325
 326                 if (thumb) {
 327                         retval = thumb2_opcode(target, address, &cur_instruction);
 328                         if (retval != ERROR_OK)
 329                                 return retval;
 330
 331                         address += cur_instruction.instruction_size;
 332                 } else {
 333                         uint32_t opcode;
 334
 335                         retval = target_read_u32(target, address, &opcode);
 336                         if (retval != ERROR_OK)
 337                                 return retval;
 338
 339                         retval = arm_evaluate_opcode(opcode, address,
 340                                         &cur_instruction);
 341                         if (retval != ERROR_OK)
 342                                 return retval;
 343
 344                         address += 4;
 345                 }
 346                 command_print(cmd_ctx, "%s", cur_instruction.text);
 347         }
 348
 349         return ERROR_OK;
 350 }
 351
 352 int armv7a_register_commands(struct command_context *cmd_ctx)
 353 {
 354         struct command *arm_adi_v5_dap_cmd;
 355         struct command *armv7a_cmd;
 356
 357         arm_adi_v5_dap_cmd = register_command(cmd_ctx, NULL, "dap",
 358                         NULL, COMMAND_ANY,
 359                         "cortex dap specific commands");
 360
 361         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "info",
 362                         handle_dap_info_command, COMMAND_EXEC,
 363                         "dap info for ap [num], "
 364                         "default currently selected AP");
 365         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apsel",
 366                         handle_dap_apsel_command, COMMAND_EXEC,
 367                         "select a different AP [num] (default 0)");
 368         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apid",
 369                         handle_dap_apid_command, COMMAND_EXEC,
 370                         "return id reg from AP [num], "
 371                         "default currently selected AP");
 372         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "baseaddr",
 373                         handle_dap_baseaddr_command, COMMAND_EXEC,
 374                         "return debug base address from AP [num], "
 375                         "default currently selected AP");
 376         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "memaccess",
 377                         handle_dap_memaccess_command, COMMAND_EXEC,
 378                         "set/get number of extra tck for mem-ap memory "
 379                         "bus access [0-255]");
 380
 381         armv7a_cmd = register_command(cmd_ctx, NULL, "armv7a",
 382                         NULL, COMMAND_ANY,
 383                         "ARMv7-A specific commands");
 384
 385         register_command(cmd_ctx, armv7a_cmd, "disassemble",
 386                         handle_armv7a_disassemble_command, COMMAND_EXEC,
 387                         "disassemble instructions <address> [<count> ['thumb']]");
 388
 389         return ERROR_OK;
 390 }