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 "log.h"
  31 #include "binarybuffer.h"
  32 #include "command.h"
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37
  38
  39 char* armv7a_core_reg_list[] =
  40 {
  41         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  42         "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
  43         "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
  44         "r13_irq", "lr_irq",
  45         "r13_svc", "lr_svc",
  46         "r13_abt", "lr_abt",
  47         "r13_und", "lr_und",
  48         "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und",
  49         "r13_mon", "lr_mon", "spsr_mon"
  50 };
  51
  52 char * armv7a_mode_strings_list[] =
  53 {
  54         "Illegal mode value", "User", "FIQ", "IRQ",
  55         "Supervisor", "Abort", "Undefined", "System", "Monitor"
  56 };
  57
  58 /* Hack! Yuk! allow -1 index, which simplifies codepaths elsewhere in the code */
  59 char** armv7a_mode_strings = armv7a_mode_strings_list+1;
  60
  61 char* armv7a_state_strings[] =
  62 {
  63         "ARM", "Thumb", "Jazelle", "ThumbEE"
  64 };
  65
  66 struct armv7a_core_reg armv7a_core_reg_list_arch_info[] =
  67 {
  68         {0, ARMV4_5_MODE_ANY, NULL, NULL},
  69         {1, ARMV4_5_MODE_ANY, NULL, NULL},
  70         {2, ARMV4_5_MODE_ANY, NULL, NULL},
  71         {3, ARMV4_5_MODE_ANY, NULL, NULL},
  72         {4, ARMV4_5_MODE_ANY, NULL, NULL},
  73         {5, ARMV4_5_MODE_ANY, NULL, NULL},
  74         {6, ARMV4_5_MODE_ANY, NULL, NULL},
  75         {7, ARMV4_5_MODE_ANY, NULL, NULL},
  76         {8, ARMV4_5_MODE_ANY, NULL, NULL},
  77         {9, ARMV4_5_MODE_ANY, NULL, NULL},
  78         {10, ARMV4_5_MODE_ANY, NULL, NULL},
  79         {11, ARMV4_5_MODE_ANY, NULL, NULL},
  80         {12, ARMV4_5_MODE_ANY, NULL, NULL},
  81         {13, ARMV4_5_MODE_USR, NULL, NULL},
  82         {14, ARMV4_5_MODE_USR, NULL, NULL},
  83         {15, ARMV4_5_MODE_ANY, NULL, NULL},
  84
  85         {8, ARMV4_5_MODE_FIQ, NULL, NULL},
  86         {9, ARMV4_5_MODE_FIQ, NULL, NULL},
  87         {10, ARMV4_5_MODE_FIQ, NULL, NULL},
  88         {11, ARMV4_5_MODE_FIQ, NULL, NULL},
  89         {12, ARMV4_5_MODE_FIQ, NULL, NULL},
  90         {13, ARMV4_5_MODE_FIQ, NULL, NULL},
  91         {14, ARMV4_5_MODE_FIQ, NULL, NULL},
  92
  93         {13, ARMV4_5_MODE_IRQ, NULL, NULL},
  94         {14, ARMV4_5_MODE_IRQ, NULL, NULL},
  95
  96         {13, ARMV4_5_MODE_SVC, NULL, NULL},
  97         {14, ARMV4_5_MODE_SVC, NULL, NULL},
  98
  99         {13, ARMV4_5_MODE_ABT, NULL, NULL},
 100         {14, ARMV4_5_MODE_ABT, NULL, NULL},
 101
 102         {13, ARMV4_5_MODE_UND, NULL, NULL},
 103         {14, ARMV4_5_MODE_UND, NULL, NULL},
 104
 105         {16, ARMV4_5_MODE_ANY, NULL, NULL},
 106         {16, ARMV4_5_MODE_FIQ, NULL, NULL},
 107         {16, ARMV4_5_MODE_IRQ, NULL, NULL},
 108         {16, ARMV4_5_MODE_SVC, NULL, NULL},
 109         {16, ARMV4_5_MODE_ABT, NULL, NULL},
 110         {16, ARMV4_5_MODE_UND, NULL, NULL},
 111
 112         {13, ARMV7A_MODE_MON, NULL, NULL},
 113         {14, ARMV7A_MODE_MON, NULL, NULL},
 114         {16, ARMV7A_MODE_MON, NULL, NULL}
 115 };
 116
 117 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
 118 int armv7a_core_reg_map[8][17] =
 119 {
 120         {       /* USR */
 121                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 122         },
 123         {       /* FIQ */
 124                 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
 125         },
 126         {       /* IRQ */
 127                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
 128         },
 129         {       /* SVC */
 130                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
 131         },
 132         {       /* ABT */
 133                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
 134         },
 135         {       /* UND */
 136                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
 137         },
 138         {       /* SYS */
 139                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 140         },
 141         {       /* MON */
 142                 /* TODO Fix the register mapping for mon, we need r13_mon,
 143                  * r14_mon and spsr_mon
 144                  */
 145                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 146         }
 147 };
 148
 149 /* FIXME this dummy is IDENTICAL to the armv4_5, arm11, and armv7m
 150  * ones... except for naming/scoping
 151  */
 152 uint8_t armv7a_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 153
 154 struct reg armv7a_gdb_dummy_fp_reg =
 155 {
 156         .name = "GDB dummy floating-point register",
 157         .value = armv7a_gdb_dummy_fp_value,
 158         .dirty = 0,
 159         .valid = 1,
 160         .size = 96,
 161         .arch_info = NULL,
 162         .arch_type = 0,
 163 };
 164
 165 void armv7a_show_fault_registers(struct target *target)
 166 {
 167         uint32_t dfsr, ifsr, dfar, ifar;
 168         struct armv7a_common *armv7a = target_to_armv7a(target);
 169
 170         armv7a->read_cp15(target, 0, 0, 5, 0, &dfsr);
 171         armv7a->read_cp15(target, 0, 1, 5, 0, &ifsr);
 172         armv7a->read_cp15(target, 0, 0, 6, 0, &dfar);
 173         armv7a->read_cp15(target, 0, 2, 6, 0, &ifar);
 174
 175         LOG_USER("Data fault registers        DFSR: %8.8" PRIx32
 176                         ", DFAR: %8.8" PRIx32, dfsr, dfar);
 177         LOG_USER("Instruction fault registers IFSR: %8.8" PRIx32
 178                         ", IFAR: %8.8" PRIx32, ifsr, ifar);
 179
 180 }
 181
 182 int armv7a_arch_state(struct target *target)
 183 {
 184         static const char *state[] =
 185         {
 186                 "disabled", "enabled"
 187         };
 188
 189         struct armv7a_common *armv7a = target_to_armv7a(target);
 190         struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
 191
 192         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 193         {
 194                 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
 195                 exit(-1);
 196         }
 197
 198         LOG_USER("target halted in %s state due to %s, current mode: %s\n"
 199                          "%s: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "\n"
 200                          "MMU: %s, D-Cache: %s, I-Cache: %s",
 201                  armv7a_state_strings[armv7a->core_state],
 202                  Jim_Nvp_value2name_simple(nvp_target_debug_reason,
 203                                 target->debug_reason)->name,
 204                  armv7a_mode_strings[
 205                         armv7a_mode_to_number(armv4_5->core_mode)],
 206                  armv7a_core_reg_list[armv7a_core_reg_map[
 207                         armv7a_mode_to_number(armv4_5->core_mode)][16]],
 208                  buf_get_u32(ARMV7A_CORE_REG_MODE(armv4_5->core_cache,
 209                                 armv4_5->core_mode, 16).value, 0, 32),
 210                  buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 211                  state[armv7a->armv4_5_mmu.mmu_enabled],
 212                  state[armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 213                  state[armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 214
 215         if (armv4_5->core_mode == ARMV7A_MODE_ABT)
 216                 armv7a_show_fault_registers(target);
 217
 218         return ERROR_OK;
 219 }
 220
 221
 222 COMMAND_HANDLER(handle_dap_baseaddr_command)
 223 {
 224         struct target *target = get_current_target(cmd_ctx);
 225         struct armv7a_common *armv7a = target_to_armv7a(target);
 226         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 227
 228         return CALL_COMMAND_HANDLER(dap_baseaddr_command, swjdp);
 229 }
 230
 231 COMMAND_HANDLER(handle_dap_memaccess_command)
 232 {
 233         struct target *target = get_current_target(cmd_ctx);
 234         struct armv7a_common *armv7a = target_to_armv7a(target);
 235         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 236
 237         return CALL_COMMAND_HANDLER(dap_memaccess_command, swjdp);
 238 }
 239
 240 COMMAND_HANDLER(handle_dap_apsel_command)
 241 {
 242         struct target *target = get_current_target(cmd_ctx);
 243         struct armv7a_common *armv7a = target_to_armv7a(target);
 244         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 245
 246         return CALL_COMMAND_HANDLER(dap_apsel_command, swjdp);
 247 }
 248
 249 COMMAND_HANDLER(handle_dap_apid_command)
 250 {
 251         struct target *target = get_current_target(cmd_ctx);
 252         struct armv7a_common *armv7a = target_to_armv7a(target);
 253         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 254
 255         return CALL_COMMAND_HANDLER(dap_apid_command, swjdp);
 256 }
 257
 258 COMMAND_HANDLER(handle_dap_info_command)
 259 {
 260         struct target *target = get_current_target(cmd_ctx);
 261         struct armv7a_common *armv7a = target_to_armv7a(target);
 262         struct swjdp_common *swjdp = &armv7a->swjdp_info;
 263         uint32_t apsel;
 264
 265         switch (argc) {
 266         case 0:
 267                 apsel = swjdp->apsel;
 268                 break;
 269         case 1:
 270                 COMMAND_PARSE_NUMBER(u32, args[0], apsel);
 271                 break;
 272         default:
 273                 return ERROR_COMMAND_SYNTAX_ERROR;
 274         }
 275
 276         return dap_info_command(cmd_ctx, swjdp, apsel);
 277 }
 278
 279 COMMAND_HANDLER(handle_armv7a_disassemble_command)
 280 {
 281         struct target *target = get_current_target(cmd_ctx);
 282         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 283         int thumb = 0;
 284         int count = 1;
 285         uint32_t address;
 286         int i;
 287
 288         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC) {
 289                 command_print(cmd_ctx, "current target isn't an ARM target");
 290                 return ERROR_OK;
 291         }
 292
 293         /* REVISIT:  eventually support ThumbEE disassembly too;
 294          * some opcodes work differently.
 295          */
 296
 297         switch (argc) {
 298         case 3:
 299                 if (strcmp(args[2], "thumb") != 0)
 300                         goto usage;
 301                 thumb = 1;
 302                 /* FALL THROUGH */
 303         case 2:
 304                 COMMAND_PARSE_NUMBER(int, args[1], count);
 305                 /* FALL THROUGH */
 306         case 1:
 307                 COMMAND_PARSE_NUMBER(u32, args[0], address);
 308                 if (address & 0x01) {
 309                         if (!thumb) {
 310                                 command_print(cmd_ctx, "Disassemble as Thumb");
 311                                 thumb = 1;
 312                         }
 313                         address &= ~1;
 314                 }
 315                 break;
 316         default:
 317 usage:
 318                 command_print(cmd_ctx,
 319                         "usage: armv7a disassemble <address> [<count> ['thumb']]");
 320                 return ERROR_OK;
 321         }
 322
 323         for (i = 0; i < count; i++) {
 324                 struct arm_instruction cur_instruction;
 325                 int retval;
 326
 327                 if (thumb) {
 328                         retval = thumb2_opcode(target, address, &cur_instruction);
 329                         if (retval != ERROR_OK)
 330                                 return retval;
 331
 332                         address += cur_instruction.instruction_size;
 333                 } else {
 334                         uint32_t opcode;
 335
 336                         retval = target_read_u32(target, address, &opcode);
 337                         if (retval != ERROR_OK)
 338                                 return retval;
 339
 340                         retval = arm_evaluate_opcode(opcode, address,
 341                                         &cur_instruction);
 342                         if (retval != ERROR_OK)
 343                                 return retval;
 344
 345                         address += 4;
 346                 }
 347                 command_print(cmd_ctx, "%s", cur_instruction.text);
 348         }
 349
 350         return ERROR_OK;
 351 }
 352
 353 int armv7a_register_commands(struct command_context *cmd_ctx)
 354 {
 355         struct command *arm_adi_v5_dap_cmd;
 356         struct command *armv7a_cmd;
 357
 358         arm_adi_v5_dap_cmd = register_command(cmd_ctx, NULL, "dap",
 359                         NULL, COMMAND_ANY,
 360                         "cortex dap specific commands");
 361
 362         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "info",
 363                         handle_dap_info_command, COMMAND_EXEC,
 364                         "dap info for ap [num], "
 365                         "default currently selected AP");
 366         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apsel",
 367                         handle_dap_apsel_command, COMMAND_EXEC,
 368                         "select a different AP [num] (default 0)");
 369         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apid",
 370                         handle_dap_apid_command, COMMAND_EXEC,
 371                         "return id reg from AP [num], "
 372                         "default currently selected AP");
 373         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "baseaddr",
 374                         handle_dap_baseaddr_command, COMMAND_EXEC,
 375                         "return debug base address from AP [num], "
 376                         "default currently selected AP");
 377         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "memaccess",
 378                         handle_dap_memaccess_command, COMMAND_EXEC,
 379                         "set/get number of extra tck for mem-ap memory "
 380                         "bus access [0-255]");
 381
 382         armv7a_cmd = register_command(cmd_ctx, NULL, "armv7a",
 383                         NULL, COMMAND_ANY,
 384                         "ARMv7-A specific commands");
 385
 386         register_command(cmd_ctx, armv7a_cmd, "disassemble",
 387                         handle_armv7a_disassemble_command, COMMAND_EXEC,
 388                         "disassemble instructions <address> [<count> ['thumb']]");
 389
 390         return ERROR_OK;
 391 }