opcodes/arm-dis.c

   1 /* Instruction printing code for the ARM
   2    Copyright (C) 1994, 95, 96, 1997 Free Software Foundation, Inc.
   3    Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
   4    Modification by James G. Smith (jsmith@cygnus.co.uk)
   5
   6 This file is part of libopcodes.
   7
   8 This program is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2 of the License, or (at your option)
  11 any later version.
  12
  13 This program is distributed in the hope that it will be useful, but WITHOUT
  14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16 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 Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "dis-asm.h"
  23 #define DEFINE_TABLE
  24 #include "arm-opc.h"
  25 #include "coff/internal.h"
  26 #include "libcoff.h"
  27
  28 static char *arm_conditional[] =
  29 {"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
  30  "hi", "ls", "ge", "lt", "gt", "le", "", "nv"};
  31
  32 static char *arm_regnames[] =
  33 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  34  "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc"};
  35
  36 static char *arm_fp_const[] =
  37 {"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
  38
  39 static char *arm_shift[] =
  40 {"lsl", "lsr", "asr", "ror"};
  41
  42 static int print_insn_arm PARAMS ((bfd_vma, struct disassemble_info *,
  43                                    long));
  44
  45 static void
  46 arm_decode_shift (given, func, stream)
  47      long given;
  48      fprintf_ftype func;
  49      void *stream;
  50 {
  51   func (stream, "%s", arm_regnames[given & 0xf]);
  52   if ((given & 0xff0) != 0)
  53     {
  54       if ((given & 0x10) == 0)
  55         {
  56           int amount = (given & 0xf80) >> 7;
  57           int shift = (given & 0x60) >> 5;
  58           if (amount == 0)
  59             {
  60               if (shift == 3)
  61                 {
  62                   func (stream, ", rrx");
  63                   return;
  64                 }
  65               amount = 32;
  66             }
  67           func (stream, ", %s #%d", arm_shift[shift], amount);
  68         }
  69       else
  70         func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
  71               arm_regnames[(given & 0xf00) >> 8]);
  72     }
  73 }
  74
  75 /* Print one instruction from PC on INFO->STREAM.
  76    Return the size of the instruction (always 4 on ARM). */
  77
  78 static int
  79 print_insn_arm (pc, info, given)
  80      bfd_vma         pc;
  81      struct disassemble_info *info;
  82      long given;
  83 {
  84   struct arm_opcode *insn;
  85   void *stream = info->stream;
  86   fprintf_ftype func = info->fprintf_func;
  87
  88   for (insn = arm_opcodes; insn->assembler; insn++)
  89     {
  90       if ((given & insn->mask) == insn->value)
  91         {
  92           char *c;
  93           for (c = insn->assembler; *c; c++)
  94             {
  95               if (*c == '%')
  96                 {
  97                   switch (*++c)
  98                     {
  99                     case '%':
 100                       func (stream, "%%");
 101                       break;
 102
 103                     case 'a':
 104                       if (((given & 0x000f0000) == 0x000f0000)
 105                           && ((given & 0x02000000) == 0))
 106                         {
 107                           int offset = given & 0xfff;
 108                           if ((given & 0x00800000) == 0)
 109                             offset = -offset;
 110                           (*info->print_address_func)
 111                             (offset + pc + 8, info);
 112                         }
 113                       else
 114                         {
 115                           func (stream, "[%s",
 116                                 arm_regnames[(given >> 16) & 0xf]);
 117                           if ((given & 0x01000000) != 0)
 118                             {
 119                               if ((given & 0x02000000) == 0)
 120                                 {
 121                                   int offset = given & 0xfff;
 122                                   if (offset)
 123                                     func (stream, ", %s#%d",
 124                                           (((given & 0x00800000) == 0)
 125                                            ? "-" : ""), offset);
 126                                 }
 127                               else
 128                                 {
 129                                   func (stream, ", %s",
 130                                         (((given & 0x00800000) == 0)
 131                                          ? "-" : ""));
 132                                   arm_decode_shift (given, func, stream);
 133                                 }
 134
 135                               func (stream, "]%s",
 136                                     ((given & 0x00200000) != 0) ? "!" : "");
 137                             }
 138                           else
 139                             {
 140                               if ((given & 0x02000000) == 0)
 141                                 {
 142                                   int offset = given & 0xfff;
 143                                   if (offset)
 144                                     func (stream, "], %s#%d",
 145                                           (((given & 0x00800000) == 0)
 146                                            ? "-" : ""), offset);
 147                                   else
 148                                     func (stream, "]");
 149                                 }
 150                               else
 151                                 {
 152                                   func (stream, "], %s",
 153                                         (((given & 0x00800000) == 0)
 154                                          ? "-" : ""));
 155                                   arm_decode_shift (given, func, stream);
 156                                 }
 157                             }
 158                         }
 159                       break;
 160
 161                     case 's':
 162                       if ((given & 0x004f0000) == 0x004f0000)
 163                         {
 164                           /* PC relative with immediate offset */
 165                           int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 166                           if ((given & 0x00800000) == 0)
 167                             offset = -offset;
 168                           (*info->print_address_func)
 169                             (offset + pc + 8, info);
 170                         }
 171                       else
 172                         {
 173                           func (stream, "[%s",
 174                                 arm_regnames[(given >> 16) & 0xf]);
 175                           if ((given & 0x01000000) != 0)
 176                             {
 177                               /* pre-indexed */
 178                               if ((given & 0x00400000) == 0x00400000)
 179                                 {
 180                                   /* immediate */
 181                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 182                                   if (offset)
 183                                     func (stream, ", %s#%d",
 184                                           (((given & 0x00800000) == 0)
 185                                            ? "-" : ""), offset);
 186                                 }
 187                               else
 188                                 {
 189                                   /* register */
 190                                   func (stream, ", %s%s",
 191                                         (((given & 0x00800000) == 0)
 192                                          ? "-" : ""),
 193                                         arm_regnames[given & 0xf]);
 194                                 }
 195
 196                               func (stream, "]%s",
 197                                     ((given & 0x00200000) != 0) ? "!" : "");
 198                             }
 199                           else
 200                             {
 201                               /* post-indexed */
 202                               if ((given & 0x00400000) == 0x00400000)
 203                                 {
 204                                   /* immediate */
 205                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 206                                   if (offset)
 207                                     func (stream, "], %s#%d",
 208                                           (((given & 0x00800000) == 0)
 209                                            ? "-" : ""), offset);
 210                                   else
 211                                     func (stream, "]");
 212                                 }
 213                               else
 214                                 {
 215                                   /* register */
 216                                   func (stream, "], %s%s",
 217                                         (((given & 0x00800000) == 0)
 218                                          ? "-" : ""),
 219                                         arm_regnames[given & 0xf]);
 220                                 }
 221                             }
 222                         }
 223                       break;
 224
 225                     case 'b':
 226                       (*info->print_address_func)
 227                         (BDISP (given) * 4 + pc + 8, info);
 228                       break;
 229
 230                     case 'c':
 231                       func (stream, "%s",
 232                             arm_conditional [(given >> 28) & 0xf]);
 233                       break;
 234
 235                     case 'm':
 236                       {
 237                         int started = 0;
 238                         int reg;
 239
 240                         func (stream, "{");
 241                         for (reg = 0; reg < 16; reg++)
 242                           if ((given & (1 << reg)) != 0)
 243                             {
 244                               if (started)
 245                                 func (stream, ", ");
 246                               started = 1;
 247                               func (stream, "%s", arm_regnames[reg]);
 248                             }
 249                         func (stream, "}");
 250                       }
 251                       break;
 252
 253                     case 'o':
 254                       if ((given & 0x02000000) != 0)
 255                         {
 256                           int rotate = (given & 0xf00) >> 7;
 257                           int immed = (given & 0xff);
 258                           func (stream, "#%d",
 259                                 ((immed << (32 - rotate))
 260                                  | (immed >> rotate)) & 0xffffffff);
 261                         }
 262                       else
 263                         arm_decode_shift (given, func, stream);
 264                       break;
 265
 266                     case 'p':
 267                       if ((given & 0x0000f000) == 0x0000f000)
 268                         func (stream, "p");
 269                       break;
 270
 271                     case 't':
 272                       if ((given & 0x01200000) == 0x00200000)
 273                         func (stream, "t");
 274                       break;
 275
 276                     case 'h':
 277                       if ((given & 0x00000020) == 0x00000020)
 278                         func (stream, "h");
 279                       else
 280                         func (stream, "b");
 281                       break;
 282
 283                     case 'A':
 284                       func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
 285                       if ((given & 0x01000000) != 0)
 286                         {
 287                           int offset = given & 0xff;
 288                           if (offset)
 289                             func (stream, ", %s#%d]%s",
 290                                   ((given & 0x00800000) == 0 ? "-" : ""),
 291                                   offset * 4,
 292                                   ((given & 0x00200000) != 0 ? "!" : ""));
 293                           else
 294                             func (stream, "]");
 295                         }
 296                       else
 297                         {
 298                           int offset = given & 0xff;
 299                           if (offset)
 300                             func (stream, "], %s#%d",
 301                                   ((given & 0x00800000) == 0 ? "-" : ""),
 302                                   offset * 4);
 303                           else
 304                             func (stream, "]");
 305                         }
 306                       break;
 307
 308                     case 'C':
 309                       switch (given & 0x00090000)
 310                         {
 311                         case 0:
 312                           func (stream, "_???");
 313                           break;
 314                         case 0x10000:
 315                           func (stream, "_ctl");
 316                           break;
 317                         case 0x80000:
 318                           func (stream, "_flg");
 319                           break;
 320                         }
 321                       break;
 322
 323                     case 'F':
 324                       switch (given & 0x00408000)
 325                         {
 326                         case 0:
 327                           func (stream, "4");
 328                           break;
 329                         case 0x8000:
 330                           func (stream, "1");
 331                           break;
 332                         case 0x00400000:
 333                           func (stream, "2");
 334                           break;
 335                         default:
 336                           func (stream, "3");
 337                         }
 338                       break;
 339
 340                     case 'P':
 341                       switch (given & 0x00080080)
 342                         {
 343                         case 0:
 344                           func (stream, "s");
 345                           break;
 346                         case 0x80:
 347                           func (stream, "d");
 348                           break;
 349                         case 0x00080000:
 350                           func (stream, "e");
 351                           break;
 352                         default:
 353                           func (stream, "<illegal precision>");
 354                           break;
 355                         }
 356                       break;
 357                     case 'Q':
 358                       switch (given & 0x00408000)
 359                         {
 360                         case 0:
 361                           func (stream, "s");
 362                           break;
 363                         case 0x8000:
 364                           func (stream, "d");
 365                           break;
 366                         case 0x00400000:
 367                           func (stream, "e");
 368                           break;
 369                         default:
 370                           func (stream, "p");
 371                           break;
 372                         }
 373                       break;
 374                     case 'R':
 375                       switch (given & 0x60)
 376                         {
 377                         case 0:
 378                           break;
 379                         case 0x20:
 380                           func (stream, "p");
 381                           break;
 382                         case 0x40:
 383                           func (stream, "m");
 384                           break;
 385                         default:
 386                           func (stream, "z");
 387                           break;
 388                         }
 389                       break;
 390
 391                     case '0': case '1': case '2': case '3': case '4':
 392                     case '5': case '6': case '7': case '8': case '9':
 393                       {
 394                         int bitstart = *c++ - '0';
 395                         int bitend = 0;
 396                         while (*c >= '0' && *c <= '9')
 397                           bitstart = (bitstart * 10) + *c++ - '0';
 398
 399                         switch (*c)
 400                           {
 401                           case '-':
 402                             c++;
 403                             while (*c >= '0' && *c <= '9')
 404                               bitend = (bitend * 10) + *c++ - '0';
 405                             if (!bitend)
 406                               abort ();
 407                             switch (*c)
 408                               {
 409                               case 'r':
 410                                 {
 411                                   long reg;
 412                                   reg = given >> bitstart;
 413                                   reg &= (2 << (bitend - bitstart)) - 1;
 414                                   func (stream, "%s", arm_regnames[reg]);
 415                                 }
 416                                 break;
 417                               case 'd':
 418                                 {
 419                                   long reg;
 420                                   reg = given >> bitstart;
 421                                   reg &= (2 << (bitend - bitstart)) - 1;
 422                                   func (stream, "%d", reg);
 423                                 }
 424                                 break;
 425                               case 'x':
 426                                 {
 427                                   long reg;
 428                                   reg = given >> bitstart;
 429                                   reg &= (2 << (bitend - bitstart)) - 1;
 430                                   func (stream, "0x%08x", reg);
 431                                 }
 432                                 break;
 433                               case 'f':
 434                                 {
 435                                   long reg;
 436                                   reg = given >> bitstart;
 437                                   reg &= (2 << (bitend - bitstart)) - 1;
 438                                   if (reg > 7)
 439                                     func (stream, "#%s",
 440                                           arm_fp_const[reg & 7]);
 441                                   else
 442                                     func (stream, "f%d", reg);
 443                                 }
 444                                 break;
 445                               default:
 446                                 abort ();
 447                               }
 448                             break;
 449                           case '`':
 450                             c++;
 451                             if ((given & (1 << bitstart)) == 0)
 452                               func (stream, "%c", *c);
 453                             break;
 454                           case '\'':
 455                             c++;
 456                             if ((given & (1 << bitstart)) != 0)
 457                               func (stream, "%c", *c);
 458                             break;
 459                           case '?':
 460                             ++c;
 461                             if ((given & (1 << bitstart)) != 0)
 462                               func (stream, "%c", *c++);
 463                             else
 464                               func (stream, "%c", *++c);
 465                             break;
 466                           default:
 467                             abort ();
 468                           }
 469                         break;
 470
 471                       default:
 472                         abort ();
 473                       }
 474                     }
 475                 }
 476               else
 477                 func (stream, "%c", *c);
 478             }
 479           return 4;
 480         }
 481     }
 482   abort ();
 483 }
 484
 485 /* Print one instruction from PC on INFO->STREAM.
 486    Return the size of the instruction. */
 487
 488 static int
 489 print_insn_thumb (pc, info, given)
 490      bfd_vma         pc;
 491      struct disassemble_info *info;
 492      long given;
 493 {
 494   struct thumb_opcode *insn;
 495   void *stream = info->stream;
 496   fprintf_ftype func = info->fprintf_func;
 497
 498   for (insn = thumb_opcodes; insn->assembler; insn++)
 499     {
 500       if ((given & insn->mask) == insn->value)
 501         {
 502           char *c = insn->assembler;
 503
 504           /* Special processing for Thumb 2 instruction BL sequence: */
 505           if (!*c) /* check for empty (not NULL) assembler string */
 506             {
 507               info->bytes_per_chunk = 4;
 508               info->bytes_per_line  = 4;
 509
 510               func (stream, "%04x\tbl\t", given & 0xffff);
 511               (*info->print_address_func)
 512                 (BDISP23 (given) * 2 + pc + 4, info);
 513               return 4;
 514             }
 515           else
 516             {
 517               info->bytes_per_chunk = 2;
 518               info->bytes_per_line  = 4;
 519
 520               given &= 0xffff;
 521               func (stream, "%04x\t", given);
 522               for (; *c; c++)
 523                 {
 524                   if (*c == '%')
 525                     {
 526                       int domaskpc = 0;
 527                       int domasklr = 0;
 528                       switch (*++c)
 529                         {
 530                         case '%':
 531                           func (stream, "%%");
 532                           break;
 533
 534                         case 'S':
 535                           {
 536                             long reg;
 537                             reg = (given >> 3) & 0x7;
 538                             if (given & (1 << 6))
 539                               reg += 8;
 540                             func (stream, "%s", arm_regnames[reg]);
 541                           }
 542                           break;
 543
 544                         case 'D':
 545                           {
 546                             long reg;
 547                             reg = given & 0x7;
 548                             if (given & (1 << 7))
 549                              reg += 8;
 550                             func (stream, "%s", arm_regnames[reg]);
 551                           }
 552                           break;
 553
 554                         case 'T':
 555                           func (stream, "%s",
 556                                 arm_conditional [(given >> 8) & 0xf]);
 557                           break;
 558
 559                         case 'N':
 560                           if (given & (1 << 8))
 561                             domasklr = 1;
 562                           /* fall through */
 563                         case 'O':
 564                           if (*c == 'O' && (given & (1 << 8)))
 565                             domaskpc = 1;
 566                           /* fall through */
 567                         case 'M':
 568                           {
 569                             int started = 0;
 570                             int reg;
 571                             func (stream, "{");
 572                             /* It would be nice if we could spot
 573                                ranges, and generate the rS-rE format: */
 574                             for (reg = 0; (reg < 8); reg++)
 575                               if ((given & (1 << reg)) != 0)
 576                                 {
 577                                   if (started)
 578                                     func (stream, ", ");
 579                                   started = 1;
 580                                   func (stream, "%s", arm_regnames[reg]);
 581                                 }
 582
 583                             if (domasklr)
 584                               {
 585                                 if (started)
 586                                   func (stream, ", ");
 587                                 started = 1;
 588                                 func (stream, "lr");
 589                               }
 590
 591                             if (domaskpc)
 592                               {
 593                                 if (started)
 594                                   func (stream, ", ");
 595                                 func (stream, "pc");
 596                               }
 597
 598                             func (stream, "}");
 599                           }
 600                           break;
 601
 602
 603                         case '0': case '1': case '2': case '3': case '4':
 604                         case '5': case '6': case '7': case '8': case '9':
 605                           {
 606                             int bitstart = *c++ - '0';
 607                             int bitend = 0;
 608                             while (*c >= '0' && *c <= '9')
 609                               bitstart = (bitstart * 10) + *c++ - '0';
 610
 611                             switch (*c)
 612                               {
 613                               case '-':
 614                                 {
 615                                   long reg;
 616                                   c++;
 617                                   while (*c >= '0' && *c <= '9')
 618                                     bitend = (bitend * 10) + *c++ - '0';
 619                                   if (!bitend)
 620                                     abort ();
 621                                   reg = given >> bitstart;
 622                                   reg &= (2 << (bitend - bitstart)) - 1;
 623                                   switch (*c)
 624                                     {
 625                                     case 'r':
 626                                       func (stream, "%s", arm_regnames[reg]);
 627                                       break;
 628
 629                                     case 'd':
 630                                       func (stream, "%d", reg);
 631                                       break;
 632
 633                                     case 'H':
 634                                       func (stream, "%d", reg << 1);
 635                                       break;
 636
 637                                     case 'W':
 638                                       func (stream, "%d", reg << 2);
 639                                       break;
 640
 641                                     case 'a':
 642                                       info->print_address_func (((pc + 4) & ~1) + (reg << 2), info);
 643                                       break;
 644
 645                                     case 'x':
 646                                       func (stream, "0x%04x", reg);
 647                                       break;
 648
 649                                     case 'I':
 650                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 651                                       func (stream, "%d", reg);
 652                                       break;
 653
 654                                     case 'B':
 655                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 656                                       (*info->print_address_func)
 657                                         (reg * 2 + pc + 4, info);
 658                                       break;
 659
 660                                     default:
 661                                       abort();
 662                                     }
 663                                 }
 664                                 break;
 665
 666                               case '\'':
 667                                 c++;
 668                                 if ((given & (1 << bitstart)) != 0)
 669                                   func (stream, "%c", *c);
 670                                 break;
 671
 672                               case '?':
 673                                 ++c;
 674                                 if ((given & (1 << bitstart)) != 0)
 675                                   func (stream, "%c", *c++);
 676                                 else
 677                                   func (stream, "%c", *++c);
 678                                 break;
 679
 680                               default:
 681                                  abort();
 682                               }
 683                           }
 684                           break;
 685
 686                         default:
 687                           abort ();
 688                         }
 689                     }
 690                   else
 691                     func (stream, "%c", *c);
 692                 }
 693              }
 694           return 2;
 695        }
 696     }
 697
 698   /* no match */
 699   abort ();
 700 }
 701
 702 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
 703
 704 int
 705 print_insn_big_arm (pc, info)
 706      bfd_vma pc;
 707      struct disassemble_info *info;
 708 {
 709   unsigned char      b[4];
 710   long               given;
 711   int                status;
 712   asymbol *          saved_symbol;
 713   coff_symbol_type * cs;
 714   int                is_thumb;
 715
 716   cs = coffsymbol (info->symbol);
 717   is_thumb =
 718      (   cs->native->u.syment.n_sclass == C_THUMBEXT
 719       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 720       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 721       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 722       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 723
 724   info->bytes_per_chunk = 4;
 725   info->display_endian = BFD_ENDIAN_BIG;
 726
 727   /* Always fetch word aligned values.  */
 728
 729   status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
 730   if (status != 0)
 731     {
 732       (*info->memory_error_func) (status, pc, info);
 733       return -1;
 734     }
 735
 736   if (is_thumb)
 737     {
 738       if (pc & 0x2)
 739         {
 740           given = (b[2] << 8) | b[3];
 741
 742           status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
 743           if (status != 0)
 744             {
 745               info->memory_error_func (status, pc + 4, info);
 746               return -1;
 747             }
 748
 749           given |= (b[0] << 24) | (b[1] << 16);
 750         }
 751       else
 752         {
 753           given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
 754         }
 755     }
 756   else
 757     {
 758       given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 759     }
 760
 761   if (is_thumb)
 762     {
 763       status = print_insn_thumb (pc, info, given);
 764     }
 765   else
 766     {
 767       status = print_insn_arm (pc, info, given);
 768     }
 769
 770   info->symbol = saved_symbol; /* Stop displayed symbols from resetting the stored symbol */
 771
 772   return status;
 773 }
 774
 775 int
 776 print_insn_little_arm (pc, info)
 777      bfd_vma pc;
 778      struct disassemble_info * info;
 779 {
 780   unsigned char      b[4];
 781   long               given;
 782   int                status;
 783   asymbol *          saved_symbol;
 784   coff_symbol_type * cs;
 785   int                is_thumb;
 786
 787   cs = coffsymbol (info->symbol);
 788   is_thumb =
 789      (   cs->native->u.syment.n_sclass == C_THUMBEXT
 790       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 791       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 792       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 793       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 794
 795   info->bytes_per_chunk = 4;
 796   info->display_endian = BFD_ENDIAN_LITTLE;
 797
 798   status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
 799   if (status != 0 && is_thumb)
 800     {
 801       info->bytes_per_chunk = 2;
 802
 803       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 804       b[3] = b[2] = 0;
 805     }
 806   if (status != 0)
 807     {
 808       (*info->memory_error_func) (status, pc, info);
 809       return -1;
 810     }
 811
 812   given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 813
 814   saved_symbol = info->symbol;
 815
 816   if (is_thumb)
 817     {
 818       status = print_insn_thumb (pc, info, given);
 819     }
 820   else
 821     {
 822       status = print_insn_arm (pc, info, given);
 823     }
 824
 825   info->symbol = saved_symbol; /* Stop displayed symbols from resetting the stored symbol */
 826
 827   return status;
 828 }