opcodes/arm-dis.c

   1 /* Instruction printing code for the ARM
   2    Copyright (C) 1994, 95, 96, 97, 1998 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 #include "opintl.h"
  28
  29 /* FIXME: This shouldn't be done here */
  30 #include "elf-bfd.h"
  31 #include "elf/internal.h"
  32 #include "elf/arm.h"
  33
  34 static char *arm_conditional[] =
  35 {"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
  36  "hi", "ls", "ge", "lt", "gt", "le", "", "nv"};
  37
  38 static char *arm_regnames[] =
  39 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  40  "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc"};
  41
  42 static char *arm_fp_const[] =
  43 {"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
  44
  45 static char *arm_shift[] =
  46 {"lsl", "lsr", "asr", "ror"};
  47
  48 static int print_insn_arm PARAMS ((bfd_vma, struct disassemble_info *,
  49                                    long));
  50
  51 static void
  52 arm_decode_shift (given, func, stream)
  53      long given;
  54      fprintf_ftype func;
  55      void *stream;
  56 {
  57   func (stream, "%s", arm_regnames[given & 0xf]);
  58   if ((given & 0xff0) != 0)
  59     {
  60       if ((given & 0x10) == 0)
  61         {
  62           int amount = (given & 0xf80) >> 7;
  63           int shift = (given & 0x60) >> 5;
  64           if (amount == 0)
  65             {
  66               if (shift == 3)
  67                 {
  68                   func (stream, ", rrx");
  69                   return;
  70                 }
  71               amount = 32;
  72             }
  73           func (stream, ", %s #%d", arm_shift[shift], amount);
  74         }
  75       else
  76         func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
  77               arm_regnames[(given & 0xf00) >> 8]);
  78     }
  79 }
  80
  81 /* Print one instruction from PC on INFO->STREAM.
  82    Return the size of the instruction (always 4 on ARM). */
  83
  84 static int
  85 print_insn_arm (pc, info, given)
  86      bfd_vma         pc;
  87      struct disassemble_info *info;
  88      long given;
  89 {
  90   struct arm_opcode *  insn;
  91   void *               stream = info->stream;
  92   fprintf_ftype        func   = info->fprintf_func;
  93
  94   for (insn = arm_opcodes; insn->assembler; insn++)
  95     {
  96       if ((given & insn->mask) == insn->value)
  97         {
  98           char * c;
  99
 100           for (c = insn->assembler; *c; c++)
 101             {
 102               if (*c == '%')
 103                 {
 104                   switch (*++c)
 105                     {
 106                     case '%':
 107                       func (stream, "%%");
 108                       break;
 109
 110                     case 'a':
 111                       if (((given & 0x000f0000) == 0x000f0000)
 112                           && ((given & 0x02000000) == 0))
 113                         {
 114                           int offset = given & 0xfff;
 115
 116                           func (stream, "[pc");
 117
 118                           if (given & 0x01000000)
 119                             {
 120                               if ((given & 0x00800000) == 0)
 121                                 offset = - offset;
 122
 123                               /* pre-indexed */
 124                               func (stream, ", #%x]", offset);
 125
 126                               offset += pc + 8;
 127
 128                               /* Cope with the possibility of write-back being used.
 129                                  Probably a very dangerous thing for the programmer
 130                                  to do, but who are we to argue ?  */
 131                               if (given & 0x00200000)
 132                                 func (stream, "!");
 133                             }
 134                           else
 135                             {
 136                               /* post indexed */
 137                               func (stream, "], #%x", offset);
 138
 139                               offset = pc + 8;  /* ie ignore the offset */
 140                             }
 141
 142                           func (stream, "\t; ");
 143                           info->print_address_func (offset, info);
 144                         }
 145                       else
 146                         {
 147                           func (stream, "[%s",
 148                                 arm_regnames[(given >> 16) & 0xf]);
 149                           if ((given & 0x01000000) != 0)
 150                             {
 151                               if ((given & 0x02000000) == 0)
 152                                 {
 153                                   int offset = given & 0xfff;
 154                                   if (offset)
 155                                     func (stream, ", %s#%d",
 156                                           (((given & 0x00800000) == 0)
 157                                            ? "-" : ""), offset);
 158                                 }
 159                               else
 160                                 {
 161                                   func (stream, ", %s",
 162                                         (((given & 0x00800000) == 0)
 163                                          ? "-" : ""));
 164                                   arm_decode_shift (given, func, stream);
 165                                 }
 166
 167                               func (stream, "]%s",
 168                                     ((given & 0x00200000) != 0) ? "!" : "");
 169                             }
 170                           else
 171                             {
 172                               if ((given & 0x02000000) == 0)
 173                                 {
 174                                   int offset = given & 0xfff;
 175                                   if (offset)
 176                                     func (stream, "], %s#%d",
 177                                           (((given & 0x00800000) == 0)
 178                                            ? "-" : ""), offset);
 179                                   else
 180                                     func (stream, "]");
 181                                 }
 182                               else
 183                                 {
 184                                   func (stream, "], %s",
 185                                         (((given & 0x00800000) == 0)
 186                                          ? "-" : ""));
 187                                   arm_decode_shift (given, func, stream);
 188                                 }
 189                             }
 190                         }
 191                       break;
 192
 193                     case 's':
 194                       if ((given & 0x004f0000) == 0x004f0000)
 195                         {
 196                           /* PC relative with immediate offset */
 197                           int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 198
 199                           if ((given & 0x00800000) == 0)
 200                             offset = -offset;
 201
 202                           func (stream, "[pc, #%x]\t; ", offset);
 203
 204                           (*info->print_address_func)
 205                             (offset + pc + 8, info);
 206                         }
 207                       else
 208                         {
 209                           func (stream, "[%s",
 210                                 arm_regnames[(given >> 16) & 0xf]);
 211                           if ((given & 0x01000000) != 0)
 212                             {
 213                               /* pre-indexed */
 214                               if ((given & 0x00400000) == 0x00400000)
 215                                 {
 216                                   /* immediate */
 217                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 218                                   if (offset)
 219                                     func (stream, ", %s#%d",
 220                                           (((given & 0x00800000) == 0)
 221                                            ? "-" : ""), offset);
 222                                 }
 223                               else
 224                                 {
 225                                   /* register */
 226                                   func (stream, ", %s%s",
 227                                         (((given & 0x00800000) == 0)
 228                                          ? "-" : ""),
 229                                         arm_regnames[given & 0xf]);
 230                                 }
 231
 232                               func (stream, "]%s",
 233                                     ((given & 0x00200000) != 0) ? "!" : "");
 234                             }
 235                           else
 236                             {
 237                               /* post-indexed */
 238                               if ((given & 0x00400000) == 0x00400000)
 239                                 {
 240                                   /* immediate */
 241                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 242                                   if (offset)
 243                                     func (stream, "], %s#%d",
 244                                           (((given & 0x00800000) == 0)
 245                                            ? "-" : ""), offset);
 246                                   else
 247                                     func (stream, "]");
 248                                 }
 249                               else
 250                                 {
 251                                   /* register */
 252                                   func (stream, "], %s%s",
 253                                         (((given & 0x00800000) == 0)
 254                                          ? "-" : ""),
 255                                         arm_regnames[given & 0xf]);
 256                                 }
 257                             }
 258                         }
 259                       break;
 260
 261                     case 'b':
 262                       (*info->print_address_func)
 263                         (BDISP (given) * 4 + pc + 8, info);
 264                       break;
 265
 266                     case 'c':
 267                       func (stream, "%s",
 268                             arm_conditional [(given >> 28) & 0xf]);
 269                       break;
 270
 271                     case 'm':
 272                       {
 273                         int started = 0;
 274                         int reg;
 275
 276                         func (stream, "{");
 277                         for (reg = 0; reg < 16; reg++)
 278                           if ((given & (1 << reg)) != 0)
 279                             {
 280                               if (started)
 281                                 func (stream, ", ");
 282                               started = 1;
 283                               func (stream, "%s", arm_regnames[reg]);
 284                             }
 285                         func (stream, "}");
 286                       }
 287                       break;
 288
 289                     case 'o':
 290                       if ((given & 0x02000000) != 0)
 291                         {
 292                           int rotate = (given & 0xf00) >> 7;
 293                           int immed = (given & 0xff);
 294                           func (stream, "#%d",
 295                                 ((immed << (32 - rotate))
 296                                  | (immed >> rotate)) & 0xffffffff);
 297                         }
 298                       else
 299                         arm_decode_shift (given, func, stream);
 300                       break;
 301
 302                     case 'p':
 303                       if ((given & 0x0000f000) == 0x0000f000)
 304                         func (stream, "p");
 305                       break;
 306
 307                     case 't':
 308                       if ((given & 0x01200000) == 0x00200000)
 309                         func (stream, "t");
 310                       break;
 311
 312                     case 'h':
 313                       if ((given & 0x00000020) == 0x00000020)
 314                         func (stream, "h");
 315                       else
 316                         func (stream, "b");
 317                       break;
 318
 319                     case 'A':
 320                       func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
 321                       if ((given & 0x01000000) != 0)
 322                         {
 323                           int offset = given & 0xff;
 324                           if (offset)
 325                             func (stream, ", %s#%d]%s",
 326                                   ((given & 0x00800000) == 0 ? "-" : ""),
 327                                   offset * 4,
 328                                   ((given & 0x00200000) != 0 ? "!" : ""));
 329                           else
 330                             func (stream, "]");
 331                         }
 332                       else
 333                         {
 334                           int offset = given & 0xff;
 335                           if (offset)
 336                             func (stream, "], %s#%d",
 337                                   ((given & 0x00800000) == 0 ? "-" : ""),
 338                                   offset * 4);
 339                           else
 340                             func (stream, "]");
 341                         }
 342                       break;
 343
 344                     case 'C':
 345                       switch (given & 0x00090000)
 346                         {
 347                         default:
 348                           func (stream, "_???");
 349                           break;
 350                         case 0x90000:
 351                           func (stream, "_all");
 352                           break;
 353                         case 0x10000:
 354                           func (stream, "_ctl");
 355                           break;
 356                         case 0x80000:
 357                           func (stream, "_flg");
 358                           break;
 359                         }
 360                       break;
 361
 362                     case 'F':
 363                       switch (given & 0x00408000)
 364                         {
 365                         case 0:
 366                           func (stream, "4");
 367                           break;
 368                         case 0x8000:
 369                           func (stream, "1");
 370                           break;
 371                         case 0x00400000:
 372                           func (stream, "2");
 373                           break;
 374                         default:
 375                           func (stream, "3");
 376                         }
 377                       break;
 378
 379                     case 'P':
 380                       switch (given & 0x00080080)
 381                         {
 382                         case 0:
 383                           func (stream, "s");
 384                           break;
 385                         case 0x80:
 386                           func (stream, "d");
 387                           break;
 388                         case 0x00080000:
 389                           func (stream, "e");
 390                           break;
 391                         default:
 392                           func (stream, _("<illegal precision>"));
 393                           break;
 394                         }
 395                       break;
 396                     case 'Q':
 397                       switch (given & 0x00408000)
 398                         {
 399                         case 0:
 400                           func (stream, "s");
 401                           break;
 402                         case 0x8000:
 403                           func (stream, "d");
 404                           break;
 405                         case 0x00400000:
 406                           func (stream, "e");
 407                           break;
 408                         default:
 409                           func (stream, "p");
 410                           break;
 411                         }
 412                       break;
 413                     case 'R':
 414                       switch (given & 0x60)
 415                         {
 416                         case 0:
 417                           break;
 418                         case 0x20:
 419                           func (stream, "p");
 420                           break;
 421                         case 0x40:
 422                           func (stream, "m");
 423                           break;
 424                         default:
 425                           func (stream, "z");
 426                           break;
 427                         }
 428                       break;
 429
 430                     case '0': case '1': case '2': case '3': case '4':
 431                     case '5': case '6': case '7': case '8': case '9':
 432                       {
 433                         int bitstart = *c++ - '0';
 434                         int bitend = 0;
 435                         while (*c >= '0' && *c <= '9')
 436                           bitstart = (bitstart * 10) + *c++ - '0';
 437
 438                         switch (*c)
 439                           {
 440                           case '-':
 441                             c++;
 442                             while (*c >= '0' && *c <= '9')
 443                               bitend = (bitend * 10) + *c++ - '0';
 444                             if (!bitend)
 445                               abort ();
 446                             switch (*c)
 447                               {
 448                               case 'r':
 449                                 {
 450                                   long reg;
 451                                   reg = given >> bitstart;
 452                                   reg &= (2 << (bitend - bitstart)) - 1;
 453                                   func (stream, "%s", arm_regnames[reg]);
 454                                 }
 455                                 break;
 456                               case 'd':
 457                                 {
 458                                   long reg;
 459                                   reg = given >> bitstart;
 460                                   reg &= (2 << (bitend - bitstart)) - 1;
 461                                   func (stream, "%d", reg);
 462                                 }
 463                                 break;
 464                               case 'x':
 465                                 {
 466                                   long reg;
 467                                   reg = given >> bitstart;
 468                                   reg &= (2 << (bitend - bitstart)) - 1;
 469                                   func (stream, "0x%08x", reg);
 470                                 }
 471                                 break;
 472                               case 'f':
 473                                 {
 474                                   long reg;
 475                                   reg = given >> bitstart;
 476                                   reg &= (2 << (bitend - bitstart)) - 1;
 477                                   if (reg > 7)
 478                                     func (stream, "#%s",
 479                                           arm_fp_const[reg & 7]);
 480                                   else
 481                                     func (stream, "f%d", reg);
 482                                 }
 483                                 break;
 484                               default:
 485                                 abort ();
 486                               }
 487                             break;
 488                           case '`':
 489                             c++;
 490                             if ((given & (1 << bitstart)) == 0)
 491                               func (stream, "%c", *c);
 492                             break;
 493                           case '\'':
 494                             c++;
 495                             if ((given & (1 << bitstart)) != 0)
 496                               func (stream, "%c", *c);
 497                             break;
 498                           case '?':
 499                             ++c;
 500                             if ((given & (1 << bitstart)) != 0)
 501                               func (stream, "%c", *c++);
 502                             else
 503                               func (stream, "%c", *++c);
 504                             break;
 505                           default:
 506                             abort ();
 507                           }
 508                         break;
 509
 510                       default:
 511                         abort ();
 512                       }
 513                     }
 514                 }
 515               else
 516                 func (stream, "%c", *c);
 517             }
 518           return 4;
 519         }
 520     }
 521   abort ();
 522 }
 523
 524 /* Print one instruction from PC on INFO->STREAM.
 525    Return the size of the instruction. */
 526
 527 static int
 528 print_insn_thumb (pc, info, given)
 529      bfd_vma         pc;
 530      struct disassemble_info *info;
 531      long given;
 532 {
 533   struct thumb_opcode *insn;
 534   void *stream = info->stream;
 535   fprintf_ftype func = info->fprintf_func;
 536
 537   for (insn = thumb_opcodes; insn->assembler; insn++)
 538     {
 539       if ((given & insn->mask) == insn->value)
 540         {
 541           char *c = insn->assembler;
 542
 543           /* Special processing for Thumb 2 instruction BL sequence: */
 544           if (!*c) /* check for empty (not NULL) assembler string */
 545             {
 546               info->bytes_per_chunk = 4;
 547               info->bytes_per_line  = 4;
 548
 549               func (stream, "%04x\tbl\t", given & 0xffff);
 550               (*info->print_address_func)
 551                 (BDISP23 (given) * 2 + pc + 4, info);
 552               return 4;
 553             }
 554           else
 555             {
 556               info->bytes_per_chunk = 2;
 557               info->bytes_per_line  = 4;
 558
 559               given &= 0xffff;
 560               func (stream, "%04x\t", given);
 561               for (; *c; c++)
 562                 {
 563                   if (*c == '%')
 564                     {
 565                       int domaskpc = 0;
 566                       int domasklr = 0;
 567                       switch (*++c)
 568                         {
 569                         case '%':
 570                           func (stream, "%%");
 571                           break;
 572
 573                         case 'S':
 574                           {
 575                             long reg;
 576                             reg = (given >> 3) & 0x7;
 577                             if (given & (1 << 6))
 578                               reg += 8;
 579                             func (stream, "%s", arm_regnames[reg]);
 580                           }
 581                           break;
 582
 583                         case 'D':
 584                           {
 585                             long reg;
 586                             reg = given & 0x7;
 587                             if (given & (1 << 7))
 588                              reg += 8;
 589                             func (stream, "%s", arm_regnames[reg]);
 590                           }
 591                           break;
 592
 593                         case 'T':
 594                           func (stream, "%s",
 595                                 arm_conditional [(given >> 8) & 0xf]);
 596                           break;
 597
 598                         case 'N':
 599                           if (given & (1 << 8))
 600                             domasklr = 1;
 601                           /* fall through */
 602                         case 'O':
 603                           if (*c == 'O' && (given & (1 << 8)))
 604                             domaskpc = 1;
 605                           /* fall through */
 606                         case 'M':
 607                           {
 608                             int started = 0;
 609                             int reg;
 610                             func (stream, "{");
 611                             /* It would be nice if we could spot
 612                                ranges, and generate the rS-rE format: */
 613                             for (reg = 0; (reg < 8); reg++)
 614                               if ((given & (1 << reg)) != 0)
 615                                 {
 616                                   if (started)
 617                                     func (stream, ", ");
 618                                   started = 1;
 619                                   func (stream, "%s", arm_regnames[reg]);
 620                                 }
 621
 622                             if (domasklr)
 623                               {
 624                                 if (started)
 625                                   func (stream, ", ");
 626                                 started = 1;
 627                                 func (stream, "lr");
 628                               }
 629
 630                             if (domaskpc)
 631                               {
 632                                 if (started)
 633                                   func (stream, ", ");
 634                                 func (stream, "pc");
 635                               }
 636
 637                             func (stream, "}");
 638                           }
 639                           break;
 640
 641
 642                         case '0': case '1': case '2': case '3': case '4':
 643                         case '5': case '6': case '7': case '8': case '9':
 644                           {
 645                             int bitstart = *c++ - '0';
 646                             int bitend = 0;
 647                             while (*c >= '0' && *c <= '9')
 648                               bitstart = (bitstart * 10) + *c++ - '0';
 649
 650                             switch (*c)
 651                               {
 652                               case '-':
 653                                 {
 654                                   long reg;
 655                                   c++;
 656                                   while (*c >= '0' && *c <= '9')
 657                                     bitend = (bitend * 10) + *c++ - '0';
 658                                   if (!bitend)
 659                                     abort ();
 660                                   reg = given >> bitstart;
 661                                   reg &= (2 << (bitend - bitstart)) - 1;
 662                                   switch (*c)
 663                                     {
 664                                     case 'r':
 665                                       func (stream, "%s", arm_regnames[reg]);
 666                                       break;
 667
 668                                     case 'd':
 669                                       func (stream, "%d", reg);
 670                                       break;
 671
 672                                     case 'H':
 673                                       func (stream, "%d", reg << 1);
 674                                       break;
 675
 676                                     case 'W':
 677                                       func (stream, "%d", reg << 2);
 678                                       break;
 679
 680                                     case 'a':
 681                                       /* PC-relative address -- the bottom two
 682                                          bits of the address are dropped before
 683                                          the calculation.  */
 684                                       info->print_address_func
 685                                         (((pc + 4) & ~3) + (reg << 2), info);
 686                                       break;
 687
 688                                     case 'x':
 689                                       func (stream, "0x%04x", reg);
 690                                       break;
 691
 692                                     case 'I':
 693                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 694                                       func (stream, "%d", reg);
 695                                       break;
 696
 697                                     case 'B':
 698                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 699                                       (*info->print_address_func)
 700                                         (reg * 2 + pc + 4, info);
 701                                       break;
 702
 703                                     default:
 704                                       abort();
 705                                     }
 706                                 }
 707                                 break;
 708
 709                               case '\'':
 710                                 c++;
 711                                 if ((given & (1 << bitstart)) != 0)
 712                                   func (stream, "%c", *c);
 713                                 break;
 714
 715                               case '?':
 716                                 ++c;
 717                                 if ((given & (1 << bitstart)) != 0)
 718                                   func (stream, "%c", *c++);
 719                                 else
 720                                   func (stream, "%c", *++c);
 721                                 break;
 722
 723                               default:
 724                                  abort();
 725                               }
 726                           }
 727                           break;
 728
 729                         default:
 730                           abort ();
 731                         }
 732                     }
 733                   else
 734                     func (stream, "%c", *c);
 735                 }
 736              }
 737           return 2;
 738        }
 739     }
 740
 741   /* no match */
 742   abort ();
 743 }
 744
 745 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
 746
 747 int
 748 print_insn_big_arm (pc, info)
 749      bfd_vma pc;
 750      struct disassemble_info *info;
 751 {
 752   unsigned char      b[4];
 753   long               given;
 754   int                status;
 755   coff_symbol_type   *cs;
 756   elf_symbol_type    *es;
 757   int                is_thumb;
 758
 759   is_thumb = false;
 760   if (info->symbols != NULL)
 761     {
 762     if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 763      {
 764        cs = coffsymbol (*info->symbols);
 765        is_thumb = (cs->native->u.syment.n_sclass == C_THUMBEXT
 766                    || cs->native->u.syment.n_sclass == C_THUMBSTAT
 767                    || cs->native->u.syment.n_sclass == C_THUMBLABEL
 768                    || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 769                    || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 770
 771      }
 772     else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 773      {
 774        es = *(elf_symbol_type **)(info->symbols);
 775        is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 776          STT_ARM_TFUNC;
 777       }
 778    }
 779
 780   info->bytes_per_chunk = 4;
 781   info->display_endian = BFD_ENDIAN_BIG;
 782
 783   /* Always fetch word aligned values.  */
 784
 785   status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
 786   if (status != 0)
 787     {
 788       (*info->memory_error_func) (status, pc, info);
 789       return -1;
 790     }
 791
 792   if (is_thumb)
 793     {
 794       if (pc & 0x2)
 795         {
 796           given = (b[2] << 8) | b[3];
 797
 798           status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
 799           if (status != 0)
 800             {
 801               info->memory_error_func (status, pc + 4, info);
 802               return -1;
 803             }
 804
 805           given |= (b[0] << 24) | (b[1] << 16);
 806         }
 807       else
 808         {
 809           given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
 810         }
 811     }
 812   else
 813     {
 814       given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 815     }
 816
 817   if (is_thumb)
 818     {
 819       status = print_insn_thumb (pc, info, given);
 820     }
 821   else
 822     {
 823       status = print_insn_arm (pc, info, given);
 824     }
 825
 826   return status;
 827 }
 828
 829 int
 830 print_insn_little_arm (pc, info)
 831      bfd_vma pc;
 832      struct disassemble_info * info;
 833 {
 834   unsigned char      b[4];
 835   long               given;
 836   int                status;
 837   coff_symbol_type   *cs;
 838   elf_symbol_type    *es;
 839   int                is_thumb;
 840
 841   is_thumb = false;
 842   if (info->symbols != NULL)
 843     {
 844     if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 845      {
 846        cs = coffsymbol (*info->symbols);
 847        is_thumb = (cs->native->u.syment.n_sclass == C_THUMBEXT
 848                    || cs->native->u.syment.n_sclass == C_THUMBSTAT
 849                    || cs->native->u.syment.n_sclass == C_THUMBLABEL
 850                    || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 851                    || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 852
 853      }
 854     else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 855      {
 856        es = *(elf_symbol_type **)(info->symbols);
 857        is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 858          STT_ARM_TFUNC;
 859       }
 860    }
 861
 862   info->bytes_per_chunk = 4;
 863   info->display_endian = BFD_ENDIAN_LITTLE;
 864
 865   status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
 866   if (status != 0 && is_thumb)
 867     {
 868       info->bytes_per_chunk = 2;
 869
 870       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 871       b[3] = b[2] = 0;
 872     }
 873   if (status != 0)
 874     {
 875       (*info->memory_error_func) (status, pc, info);
 876       return -1;
 877     }
 878
 879   given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 880
 881   if (is_thumb)
 882     {
 883       status = print_insn_thumb (pc, info, given);
 884     }
 885   else
 886     {
 887       status = print_insn_arm (pc, info, given);
 888     }
 889
 890   return status;
 891 }