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 bitfield_desc_t armv7a_psr_bitfield_desc[] =
  39 {
  40         {"M[4:0]", 5},
  41         {"T", 1},
  42         {"F", 1},
  43         {"I", 1},
  44         {"A", 1},
  45         {"E", 1},
  46         {"IT[7:2]", 6},
  47         {"GE[3:0]", 4},
  48         {"reserved(DNM)", 4},
  49         {"J", 1},
  50         {"IT[0:1]", 2},
  51         {"Q", 1},
  52         {"V", 1},
  53         {"C", 1},
  54         {"Z", 1},
  55         {"N", 1},
  56 };
  57
  58 char* armv7a_core_reg_list[] =
  59 {
  60         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  61         "r8", "r9", "r10", "r11", "r12", "r13_usr", "lr_usr", "pc",
  62         "r8_fiq", "r9_fiq", "r10_fiq", "r11_fiq", "r12_fiq", "r13_fiq", "lr_fiq",
  63         "r13_irq", "lr_irq",
  64         "r13_svc", "lr_svc",
  65         "r13_abt", "lr_abt",
  66         "r13_und", "lr_und",
  67         "cpsr", "spsr_fiq", "spsr_irq", "spsr_svc", "spsr_abt", "spsr_und",
  68         "r13_mon", "lr_mon", "spsr_mon"
  69 };
  70
  71 char * armv7a_mode_strings_list[] =
  72 {
  73         "Illegal mode value", "User", "FIQ", "IRQ",
  74         "Supervisor", "Abort", "Undefined", "System", "Monitor"
  75 };
  76
  77 /* Hack! Yuk! allow -1 index, which simplifies codepaths elsewhere in the code */
  78 char** armv7a_mode_strings = armv7a_mode_strings_list+1;
  79
  80 char* armv7a_state_strings[] =
  81 {
  82         "ARM", "Thumb", "Jazelle", "ThumbEE"
  83 };
  84
  85 armv7a_core_reg_t armv7a_core_reg_list_arch_info[] =
  86 {
  87         {0, ARMV4_5_MODE_ANY, NULL, NULL},
  88         {1, ARMV4_5_MODE_ANY, NULL, NULL},
  89         {2, ARMV4_5_MODE_ANY, NULL, NULL},
  90         {3, ARMV4_5_MODE_ANY, NULL, NULL},
  91         {4, ARMV4_5_MODE_ANY, NULL, NULL},
  92         {5, ARMV4_5_MODE_ANY, NULL, NULL},
  93         {6, ARMV4_5_MODE_ANY, NULL, NULL},
  94         {7, ARMV4_5_MODE_ANY, NULL, NULL},
  95         {8, ARMV4_5_MODE_ANY, NULL, NULL},
  96         {9, ARMV4_5_MODE_ANY, NULL, NULL},
  97         {10, ARMV4_5_MODE_ANY, NULL, NULL},
  98         {11, ARMV4_5_MODE_ANY, NULL, NULL},
  99         {12, ARMV4_5_MODE_ANY, NULL, NULL},
 100         {13, ARMV4_5_MODE_USR, NULL, NULL},
 101         {14, ARMV4_5_MODE_USR, NULL, NULL},
 102         {15, ARMV4_5_MODE_ANY, NULL, NULL},
 103
 104         {8, ARMV4_5_MODE_FIQ, NULL, NULL},
 105         {9, ARMV4_5_MODE_FIQ, NULL, NULL},
 106         {10, ARMV4_5_MODE_FIQ, NULL, NULL},
 107         {11, ARMV4_5_MODE_FIQ, NULL, NULL},
 108         {12, ARMV4_5_MODE_FIQ, NULL, NULL},
 109         {13, ARMV4_5_MODE_FIQ, NULL, NULL},
 110         {14, ARMV4_5_MODE_FIQ, NULL, NULL},
 111
 112         {13, ARMV4_5_MODE_IRQ, NULL, NULL},
 113         {14, ARMV4_5_MODE_IRQ, NULL, NULL},
 114
 115         {13, ARMV4_5_MODE_SVC, NULL, NULL},
 116         {14, ARMV4_5_MODE_SVC, NULL, NULL},
 117
 118         {13, ARMV4_5_MODE_ABT, NULL, NULL},
 119         {14, ARMV4_5_MODE_ABT, NULL, NULL},
 120
 121         {13, ARMV4_5_MODE_UND, NULL, NULL},
 122         {14, ARMV4_5_MODE_UND, NULL, NULL},
 123
 124         {16, ARMV4_5_MODE_ANY, NULL, NULL},
 125         {16, ARMV4_5_MODE_FIQ, NULL, NULL},
 126         {16, ARMV4_5_MODE_IRQ, NULL, NULL},
 127         {16, ARMV4_5_MODE_SVC, NULL, NULL},
 128         {16, ARMV4_5_MODE_ABT, NULL, NULL},
 129         {16, ARMV4_5_MODE_UND, NULL, NULL},
 130
 131         {13, ARMV7A_MODE_MON, NULL, NULL},
 132         {14, ARMV7A_MODE_MON, NULL, NULL},
 133         {16, ARMV7A_MODE_MON, NULL, NULL}
 134 };
 135
 136 /* map core mode (USR, FIQ, ...) and register number to indizes into the register cache */
 137 int armv7a_core_reg_map[8][17] =
 138 {
 139         {       /* USR */
 140                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 141         },
 142         {       /* FIQ */
 143                 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
 144         },
 145         {       /* IRQ */
 146                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
 147         },
 148         {       /* SVC */
 149                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
 150         },
 151         {       /* ABT */
 152                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
 153         },
 154         {       /* UND */
 155                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
 156         },
 157         {       /* SYS */
 158                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 159         },
 160         {       /* MON */
 161                 /* TODO Fix the register mapping for mon, we need r13_mon,
 162                  * r14_mon and spsr_mon
 163                  */
 164                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
 165         }
 166 };
 167
 168 uint8_t armv7a_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 169
 170 reg_t armv7a_gdb_dummy_fp_reg =
 171 {
 172         "GDB dummy floating-point register", armv7a_gdb_dummy_fp_value,
 173                         0, 1, 96, NULL, 0, NULL, 0
 174 };
 175
 176 void armv7a_show_fault_registers(target_t *target)
 177 {
 178         uint32_t dfsr, ifsr, dfar, ifar;
 179         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 180
 181         armv7a->read_cp15(target, 0, 0, 5, 0, &dfsr);
 182         armv7a->read_cp15(target, 0, 1, 5, 0, &ifsr);
 183         armv7a->read_cp15(target, 0, 0, 6, 0, &dfar);
 184         armv7a->read_cp15(target, 0, 2, 6, 0, &ifar);
 185
 186         LOG_USER("Data fault registers        DFSR: %8.8" PRIx32
 187                         ", DFAR: %8.8" PRIx32, dfsr, dfar);
 188         LOG_USER("Instruction fault registers IFSR: %8.8" PRIx32
 189                         ", IFAR: %8.8" PRIx32, ifsr, ifar);
 190
 191 }
 192
 193 int armv7a_arch_state(struct target_s *target)
 194 {
 195         static const char *state[] =
 196         {
 197                 "disabled", "enabled"
 198         };
 199
 200         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 201         struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
 202
 203         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
 204         {
 205                 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
 206                 exit(-1);
 207         }
 208
 209         LOG_USER("target halted in %s state due to %s, current mode: %s\n"
 210                          "%s: 0x%8.8" PRIx32 " pc: 0x%8.8" PRIx32 "\n"
 211                          "MMU: %s, D-Cache: %s, I-Cache: %s",
 212                  armv7a_state_strings[armv7a->core_state],
 213                  Jim_Nvp_value2name_simple(nvp_target_debug_reason,
 214                                 target->debug_reason)->name,
 215                  armv7a_mode_strings[
 216                         armv7a_mode_to_number(armv4_5->core_mode)],
 217                  armv7a_core_reg_list[armv7a_core_reg_map[
 218                         armv7a_mode_to_number(armv4_5->core_mode)][16]],
 219                  buf_get_u32(ARMV7A_CORE_REG_MODE(armv4_5->core_cache,
 220                                 armv4_5->core_mode, 16).value, 0, 32),
 221                  buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32),
 222                  state[armv7a->armv4_5_mmu.mmu_enabled],
 223                  state[armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
 224                  state[armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
 225
 226         if (armv4_5->core_mode == ARMV7A_MODE_ABT)
 227                 armv7a_show_fault_registers(target);
 228
 229         return ERROR_OK;
 230 }
 231
 232
 233 static int handle_dap_baseaddr_command(struct command_context_s *cmd_ctx,
 234                 char *cmd, char **args, int argc)
 235 {
 236         target_t *target = get_current_target(cmd_ctx);
 237         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 238         swjdp_common_t *swjdp = &armv7a->swjdp_info;
 239
 240         return dap_baseaddr_command(cmd_ctx, swjdp, args, argc);
 241 }
 242
 243 static int handle_dap_memaccess_command(struct command_context_s *cmd_ctx,
 244                 char *cmd, char **args, int argc)
 245 {
 246         target_t *target = get_current_target(cmd_ctx);
 247         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 248         swjdp_common_t *swjdp = &armv7a->swjdp_info;
 249
 250         return dap_memaccess_command(cmd_ctx, swjdp, args, argc);
 251 }
 252
 253 static int handle_dap_apsel_command(struct command_context_s *cmd_ctx,
 254                 char *cmd, char **args, int argc)
 255 {
 256         target_t *target = get_current_target(cmd_ctx);
 257         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 258         swjdp_common_t *swjdp = &armv7a->swjdp_info;
 259
 260         return dap_apsel_command(cmd_ctx, swjdp, args, argc);
 261 }
 262
 263 static int handle_dap_apid_command(struct command_context_s *cmd_ctx,
 264                 char *cmd, char **args, int argc)
 265 {
 266         target_t *target = get_current_target(cmd_ctx);
 267         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 268         swjdp_common_t *swjdp = &armv7a->swjdp_info;
 269
 270         return dap_apid_command(cmd_ctx, swjdp, args, argc);
 271 }
 272
 273 static int handle_dap_info_command(struct command_context_s *cmd_ctx,
 274                 char *cmd, char **args, int argc)
 275 {
 276         target_t *target = get_current_target(cmd_ctx);
 277         struct armv7a_common_s *armv7a = target_to_armv7a(target);
 278         swjdp_common_t *swjdp = &armv7a->swjdp_info;
 279         uint32_t apsel;
 280
 281         switch (argc) {
 282         case 0:
 283                 apsel = swjdp->apsel;
 284                 break;
 285         case 1:
 286                 COMMAND_PARSE_NUMBER(u32, args[0], apsel);
 287                 break;
 288         default:
 289                 return ERROR_COMMAND_SYNTAX_ERROR;
 290         }
 291
 292         return dap_info_command(cmd_ctx, swjdp, apsel);
 293 }
 294
 295 static int
 296 handle_armv7a_disassemble_command(struct command_context_s *cmd_ctx,
 297                 char *cmd, char **args, int argc)
 298 {
 299         target_t *target = get_current_target(cmd_ctx);
 300         struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 301         int thumb = 0;
 302         int count = 1;
 303         uint32_t address;
 304         int i;
 305
 306         if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC) {
 307                 command_print(cmd_ctx, "current target isn't an ARM target");
 308                 return ERROR_OK;
 309         }
 310
 311         /* REVISIT:  eventually support ThumbEE disassembly too;
 312          * some opcodes work differently.
 313          */
 314
 315         switch (argc) {
 316         case 3:
 317                 if (strcmp(args[2], "thumb") != 0)
 318                         goto usage;
 319                 thumb = 1;
 320                 /* FALL THROUGH */
 321         case 2:
 322                 COMMAND_PARSE_NUMBER(int, args[1], count);
 323                 /* FALL THROUGH */
 324         case 1:
 325                 COMMAND_PARSE_NUMBER(u32, args[0], address);
 326                 if (address & 0x01) {
 327                         if (!thumb) {
 328                                 command_print(cmd_ctx, "Disassemble as Thumb");
 329                                 thumb = 1;
 330                         }
 331                         address &= ~1;
 332                 }
 333                 break;
 334         default:
 335 usage:
 336                 command_print(cmd_ctx,
 337                         "usage: armv7a disassemble <address> [<count> ['thumb']]");
 338                 return ERROR_OK;
 339         }
 340
 341         for (i = 0; i < count; i++) {
 342                 arm_instruction_t cur_instruction;
 343                 int retval;
 344
 345                 if (thumb) {
 346                         retval = thumb2_opcode(target, address, &cur_instruction);
 347                         if (retval != ERROR_OK)
 348                                 return retval;
 349
 350                         address += cur_instruction.instruction_size;
 351                 } else {
 352                         uint32_t opcode;
 353
 354                         retval = target_read_u32(target, address, &opcode);
 355                         if (retval != ERROR_OK)
 356                                 return retval;
 357
 358                         retval = arm_evaluate_opcode(opcode, address,
 359                                         &cur_instruction);
 360                         if (retval != ERROR_OK)
 361                                 return retval;
 362
 363                         address += 4;
 364                 }
 365                 command_print(cmd_ctx, "%s", cur_instruction.text);
 366         }
 367
 368         return ERROR_OK;
 369 }
 370
 371 int armv7a_register_commands(struct command_context_s *cmd_ctx)
 372 {
 373         command_t *arm_adi_v5_dap_cmd;
 374         command_t *armv7a_cmd;
 375
 376         arm_adi_v5_dap_cmd = register_command(cmd_ctx, NULL, "dap",
 377                         NULL, COMMAND_ANY,
 378                         "cortex dap specific commands");
 379
 380         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "info",
 381                         handle_dap_info_command, COMMAND_EXEC,
 382                         "dap info for ap [num], "
 383                         "default currently selected AP");
 384         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apsel",
 385                         handle_dap_apsel_command, COMMAND_EXEC,
 386                         "select a different AP [num] (default 0)");
 387         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "apid",
 388                         handle_dap_apid_command, COMMAND_EXEC,
 389                         "return id reg from AP [num], "
 390                         "default currently selected AP");
 391         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "baseaddr",
 392                         handle_dap_baseaddr_command, COMMAND_EXEC,
 393                         "return debug base address from AP [num], "
 394                         "default currently selected AP");
 395         register_command(cmd_ctx, arm_adi_v5_dap_cmd, "memaccess",
 396                         handle_dap_memaccess_command, COMMAND_EXEC,
 397                         "set/get number of extra tck for mem-ap memory "
 398                         "bus access [0-255]");
 399
 400         armv7a_cmd = register_command(cmd_ctx, NULL, "armv7a",
 401                         NULL, COMMAND_ANY,
 402                         "ARMv7-A specific commands");
 403
 404         register_command(cmd_ctx, armv7a_cmd, "disassemble",
 405                         handle_armv7a_disassemble_command, COMMAND_EXEC,
 406                         "disassemble instructions <address> [<count> ['thumb']]");
 407
 408         return ERROR_OK;
 409 }