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