opcodes/arm-dis.c

   1 /* Instruction printing code for the ARM
   2    Copyright (C) 1994, 95, 96, 97, 98, 1999 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_raw[] =
  39 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  40  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"};
  41
  42 static char *arm_regnames_standard[] =
  43 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  44  "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc"};
  45
  46 static char *arm_regnames_apcs[] =
  47 {"a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
  48  "v5", "v6", "sl", "fp", "ip", "sp", "lr", "pc"};
  49
  50 /* Choose which register name set to use.  */
  51 static char **arm_regnames = arm_regnames_standard;
  52
  53 static char *arm_fp_const[] =
  54 {"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
  55
  56 static char *arm_shift[] =
  57 {"lsl", "lsr", "asr", "ror"};
  58
  59 static int print_insn_arm PARAMS ((bfd_vma, struct disassemble_info *,
  60                                    long));
  61
  62 static void
  63 arm_decode_shift (given, func, stream)
  64      long given;
  65      fprintf_ftype func;
  66      void *stream;
  67 {
  68   func (stream, "%s", arm_regnames[given & 0xf]);
  69   if ((given & 0xff0) != 0)
  70     {
  71       if ((given & 0x10) == 0)
  72         {
  73           int amount = (given & 0xf80) >> 7;
  74           int shift = (given & 0x60) >> 5;
  75           if (amount == 0)
  76             {
  77               if (shift == 3)
  78                 {
  79                   func (stream, ", rrx");
  80                   return;
  81                 }
  82               amount = 32;
  83             }
  84           func (stream, ", %s #%d", arm_shift[shift], amount);
  85         }
  86       else
  87         func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
  88               arm_regnames[(given & 0xf00) >> 8]);
  89     }
  90 }
  91
  92 /* Print one instruction from PC on INFO->STREAM.
  93    Return the size of the instruction (always 4 on ARM). */
  94
  95 static int
  96 print_insn_arm (pc, info, given)
  97      bfd_vma         pc;
  98      struct disassemble_info *info;
  99      long given;
 100 {
 101   struct arm_opcode *  insn;
 102   void *               stream = info->stream;
 103   fprintf_ftype        func   = info->fprintf_func;
 104
 105   for (insn = arm_opcodes; insn->assembler; insn++)
 106     {
 107       if ((given & insn->mask) == insn->value)
 108         {
 109           char * c;
 110
 111           for (c = insn->assembler; *c; c++)
 112             {
 113               if (*c == '%')
 114                 {
 115                   switch (*++c)
 116                     {
 117                     case '%':
 118                       func (stream, "%%");
 119                       break;
 120
 121                     case 'a':
 122                       if (((given & 0x000f0000) == 0x000f0000)
 123                           && ((given & 0x02000000) == 0))
 124                         {
 125                           int offset = given & 0xfff;
 126
 127                           func (stream, "[pc");
 128
 129                           if (given & 0x01000000)
 130                             {
 131                               if ((given & 0x00800000) == 0)
 132                                 offset = - offset;
 133
 134                               /* pre-indexed */
 135                               func (stream, ", #%x]", offset);
 136
 137                               offset += pc + 8;
 138
 139                               /* Cope with the possibility of write-back being used.
 140                                  Probably a very dangerous thing for the programmer
 141                                  to do, but who are we to argue ?  */
 142                               if (given & 0x00200000)
 143                                 func (stream, "!");
 144                             }
 145                           else
 146                             {
 147                               /* post indexed */
 148                               func (stream, "], #%x", offset);
 149
 150                               offset = pc + 8;  /* ie ignore the offset */
 151                             }
 152
 153                           func (stream, "\t; ");
 154                           info->print_address_func (offset, info);
 155                         }
 156                       else
 157                         {
 158                           func (stream, "[%s",
 159                                 arm_regnames[(given >> 16) & 0xf]);
 160                           if ((given & 0x01000000) != 0)
 161                             {
 162                               if ((given & 0x02000000) == 0)
 163                                 {
 164                                   int offset = given & 0xfff;
 165                                   if (offset)
 166                                     func (stream, ", %s#%d",
 167                                           (((given & 0x00800000) == 0)
 168                                            ? "-" : ""), offset);
 169                                 }
 170                               else
 171                                 {
 172                                   func (stream, ", %s",
 173                                         (((given & 0x00800000) == 0)
 174                                          ? "-" : ""));
 175                                   arm_decode_shift (given, func, stream);
 176                                 }
 177
 178                               func (stream, "]%s",
 179                                     ((given & 0x00200000) != 0) ? "!" : "");
 180                             }
 181                           else
 182                             {
 183                               if ((given & 0x02000000) == 0)
 184                                 {
 185                                   int offset = given & 0xfff;
 186                                   if (offset)
 187                                     func (stream, "], %s#%d",
 188                                           (((given & 0x00800000) == 0)
 189                                            ? "-" : ""), offset);
 190                                   else
 191                                     func (stream, "]");
 192                                 }
 193                               else
 194                                 {
 195                                   func (stream, "], %s",
 196                                         (((given & 0x00800000) == 0)
 197                                          ? "-" : ""));
 198                                   arm_decode_shift (given, func, stream);
 199                                 }
 200                             }
 201                         }
 202                       break;
 203
 204                     case 's':
 205                       if ((given & 0x004f0000) == 0x004f0000)
 206                         {
 207                           /* PC relative with immediate offset */
 208                           int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 209
 210                           if ((given & 0x00800000) == 0)
 211                             offset = -offset;
 212
 213                           func (stream, "[pc, #%x]\t; ", offset);
 214
 215                           (*info->print_address_func)
 216                             (offset + pc + 8, info);
 217                         }
 218                       else
 219                         {
 220                           func (stream, "[%s",
 221                                 arm_regnames[(given >> 16) & 0xf]);
 222                           if ((given & 0x01000000) != 0)
 223                             {
 224                               /* pre-indexed */
 225                               if ((given & 0x00400000) == 0x00400000)
 226                                 {
 227                                   /* immediate */
 228                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 229                                   if (offset)
 230                                     func (stream, ", %s#%d",
 231                                           (((given & 0x00800000) == 0)
 232                                            ? "-" : ""), offset);
 233                                 }
 234                               else
 235                                 {
 236                                   /* register */
 237                                   func (stream, ", %s%s",
 238                                         (((given & 0x00800000) == 0)
 239                                          ? "-" : ""),
 240                                         arm_regnames[given & 0xf]);
 241                                 }
 242
 243                               func (stream, "]%s",
 244                                     ((given & 0x00200000) != 0) ? "!" : "");
 245                             }
 246                           else
 247                             {
 248                               /* post-indexed */
 249                               if ((given & 0x00400000) == 0x00400000)
 250                                 {
 251                                   /* immediate */
 252                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 253                                   if (offset)
 254                                     func (stream, "], %s#%d",
 255                                           (((given & 0x00800000) == 0)
 256                                            ? "-" : ""), offset);
 257                                   else
 258                                     func (stream, "]");
 259                                 }
 260                               else
 261                                 {
 262                                   /* register */
 263                                   func (stream, "], %s%s",
 264                                         (((given & 0x00800000) == 0)
 265                                          ? "-" : ""),
 266                                         arm_regnames[given & 0xf]);
 267                                 }
 268                             }
 269                         }
 270                       break;
 271
 272                     case 'b':
 273                       (*info->print_address_func)
 274                         (BDISP (given) * 4 + pc + 8, info);
 275                       break;
 276
 277                     case 'c':
 278                       func (stream, "%s",
 279                             arm_conditional [(given >> 28) & 0xf]);
 280                       break;
 281
 282                     case 'm':
 283                       {
 284                         int started = 0;
 285                         int reg;
 286
 287                         func (stream, "{");
 288                         for (reg = 0; reg < 16; reg++)
 289                           if ((given & (1 << reg)) != 0)
 290                             {
 291                               if (started)
 292                                 func (stream, ", ");
 293                               started = 1;
 294                               func (stream, "%s", arm_regnames[reg]);
 295                             }
 296                         func (stream, "}");
 297                       }
 298                       break;
 299
 300                     case 'o':
 301                       if ((given & 0x02000000) != 0)
 302                         {
 303                           int rotate = (given & 0xf00) >> 7;
 304                           int immed = (given & 0xff);
 305                           func (stream, "#%d",
 306                                 ((immed << (32 - rotate))
 307                                  | (immed >> rotate)) & 0xffffffff);
 308                         }
 309                       else
 310                         arm_decode_shift (given, func, stream);
 311                       break;
 312
 313                     case 'p':
 314                       if ((given & 0x0000f000) == 0x0000f000)
 315                         func (stream, "p");
 316                       break;
 317
 318                     case 't':
 319                       if ((given & 0x01200000) == 0x00200000)
 320                         func (stream, "t");
 321                       break;
 322
 323                     case 'h':
 324                       if ((given & 0x00000020) == 0x00000020)
 325                         func (stream, "h");
 326                       else
 327                         func (stream, "b");
 328                       break;
 329
 330                     case 'A':
 331                       func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
 332                       if ((given & 0x01000000) != 0)
 333                         {
 334                           int offset = given & 0xff;
 335                           if (offset)
 336                             func (stream, ", %s#%d]%s",
 337                                   ((given & 0x00800000) == 0 ? "-" : ""),
 338                                   offset * 4,
 339                                   ((given & 0x00200000) != 0 ? "!" : ""));
 340                           else
 341                             func (stream, "]");
 342                         }
 343                       else
 344                         {
 345                           int offset = given & 0xff;
 346                           if (offset)
 347                             func (stream, "], %s#%d",
 348                                   ((given & 0x00800000) == 0 ? "-" : ""),
 349                                   offset * 4);
 350                           else
 351                             func (stream, "]");
 352                         }
 353                       break;
 354
 355                     case 'C':
 356                       switch (given & 0x00090000)
 357                         {
 358                         default:
 359                           func (stream, "_???");
 360                           break;
 361                         case 0x90000:
 362                           func (stream, "_all");
 363                           break;
 364                         case 0x10000:
 365                           func (stream, "_ctl");
 366                           break;
 367                         case 0x80000:
 368                           func (stream, "_flg");
 369                           break;
 370                         }
 371                       break;
 372
 373                     case 'F':
 374                       switch (given & 0x00408000)
 375                         {
 376                         case 0:
 377                           func (stream, "4");
 378                           break;
 379                         case 0x8000:
 380                           func (stream, "1");
 381                           break;
 382                         case 0x00400000:
 383                           func (stream, "2");
 384                           break;
 385                         default:
 386                           func (stream, "3");
 387                         }
 388                       break;
 389
 390                     case 'P':
 391                       switch (given & 0x00080080)
 392                         {
 393                         case 0:
 394                           func (stream, "s");
 395                           break;
 396                         case 0x80:
 397                           func (stream, "d");
 398                           break;
 399                         case 0x00080000:
 400                           func (stream, "e");
 401                           break;
 402                         default:
 403                           func (stream, _("<illegal precision>"));
 404                           break;
 405                         }
 406                       break;
 407                     case 'Q':
 408                       switch (given & 0x00408000)
 409                         {
 410                         case 0:
 411                           func (stream, "s");
 412                           break;
 413                         case 0x8000:
 414                           func (stream, "d");
 415                           break;
 416                         case 0x00400000:
 417                           func (stream, "e");
 418                           break;
 419                         default:
 420                           func (stream, "p");
 421                           break;
 422                         }
 423                       break;
 424                     case 'R':
 425                       switch (given & 0x60)
 426                         {
 427                         case 0:
 428                           break;
 429                         case 0x20:
 430                           func (stream, "p");
 431                           break;
 432                         case 0x40:
 433                           func (stream, "m");
 434                           break;
 435                         default:
 436                           func (stream, "z");
 437                           break;
 438                         }
 439                       break;
 440
 441                     case '0': case '1': case '2': case '3': case '4':
 442                     case '5': case '6': case '7': case '8': case '9':
 443                       {
 444                         int bitstart = *c++ - '0';
 445                         int bitend = 0;
 446                         while (*c >= '0' && *c <= '9')
 447                           bitstart = (bitstart * 10) + *c++ - '0';
 448
 449                         switch (*c)
 450                           {
 451                           case '-':
 452                             c++;
 453                             while (*c >= '0' && *c <= '9')
 454                               bitend = (bitend * 10) + *c++ - '0';
 455                             if (!bitend)
 456                               abort ();
 457                             switch (*c)
 458                               {
 459                               case 'r':
 460                                 {
 461                                   long reg;
 462                                   reg = given >> bitstart;
 463                                   reg &= (2 << (bitend - bitstart)) - 1;
 464                                   func (stream, "%s", arm_regnames[reg]);
 465                                 }
 466                                 break;
 467                               case 'd':
 468                                 {
 469                                   long reg;
 470                                   reg = given >> bitstart;
 471                                   reg &= (2 << (bitend - bitstart)) - 1;
 472                                   func (stream, "%d", reg);
 473                                 }
 474                                 break;
 475                               case 'x':
 476                                 {
 477                                   long reg;
 478                                   reg = given >> bitstart;
 479                                   reg &= (2 << (bitend - bitstart)) - 1;
 480                                   func (stream, "0x%08x", reg);
 481                                 }
 482                                 break;
 483                               case 'f':
 484                                 {
 485                                   long reg;
 486                                   reg = given >> bitstart;
 487                                   reg &= (2 << (bitend - bitstart)) - 1;
 488                                   if (reg > 7)
 489                                     func (stream, "#%s",
 490                                           arm_fp_const[reg & 7]);
 491                                   else
 492                                     func (stream, "f%d", reg);
 493                                 }
 494                                 break;
 495                               default:
 496                                 abort ();
 497                               }
 498                             break;
 499                           case '`':
 500                             c++;
 501                             if ((given & (1 << bitstart)) == 0)
 502                               func (stream, "%c", *c);
 503                             break;
 504                           case '\'':
 505                             c++;
 506                             if ((given & (1 << bitstart)) != 0)
 507                               func (stream, "%c", *c);
 508                             break;
 509                           case '?':
 510                             ++c;
 511                             if ((given & (1 << bitstart)) != 0)
 512                               func (stream, "%c", *c++);
 513                             else
 514                               func (stream, "%c", *++c);
 515                             break;
 516                           default:
 517                             abort ();
 518                           }
 519                         break;
 520
 521                       default:
 522                         abort ();
 523                       }
 524                     }
 525                 }
 526               else
 527                 func (stream, "%c", *c);
 528             }
 529           return 4;
 530         }
 531     }
 532   abort ();
 533 }
 534
 535 /* Print one instruction from PC on INFO->STREAM.
 536    Return the size of the instruction. */
 537
 538 static int
 539 print_insn_thumb (pc, info, given)
 540      bfd_vma         pc;
 541      struct disassemble_info *info;
 542      long given;
 543 {
 544   struct thumb_opcode *insn;
 545   void *stream = info->stream;
 546   fprintf_ftype func = info->fprintf_func;
 547
 548   for (insn = thumb_opcodes; insn->assembler; insn++)
 549     {
 550       if ((given & insn->mask) == insn->value)
 551         {
 552           char *c = insn->assembler;
 553
 554           /* Special processing for Thumb 2 instruction BL sequence: */
 555           if (!*c) /* check for empty (not NULL) assembler string */
 556             {
 557               info->bytes_per_chunk = 4;
 558               info->bytes_per_line  = 4;
 559
 560               func (stream, "%04x\tbl\t", given & 0xffff);
 561               (*info->print_address_func)
 562                 (BDISP23 (given) * 2 + pc + 4, info);
 563               return 4;
 564             }
 565           else
 566             {
 567               info->bytes_per_chunk = 2;
 568               info->bytes_per_line  = 4;
 569
 570               given &= 0xffff;
 571               func (stream, "%04x\t", given);
 572               for (; *c; c++)
 573                 {
 574                   if (*c == '%')
 575                     {
 576                       int domaskpc = 0;
 577                       int domasklr = 0;
 578                       switch (*++c)
 579                         {
 580                         case '%':
 581                           func (stream, "%%");
 582                           break;
 583
 584                         case 'S':
 585                           {
 586                             long reg;
 587                             reg = (given >> 3) & 0x7;
 588                             if (given & (1 << 6))
 589                               reg += 8;
 590                             func (stream, "%s", arm_regnames[reg]);
 591                           }
 592                           break;
 593
 594                         case 'D':
 595                           {
 596                             long reg;
 597                             reg = given & 0x7;
 598                             if (given & (1 << 7))
 599                              reg += 8;
 600                             func (stream, "%s", arm_regnames[reg]);
 601                           }
 602                           break;
 603
 604                         case 'T':
 605                           func (stream, "%s",
 606                                 arm_conditional [(given >> 8) & 0xf]);
 607                           break;
 608
 609                         case 'N':
 610                           if (given & (1 << 8))
 611                             domasklr = 1;
 612                           /* fall through */
 613                         case 'O':
 614                           if (*c == 'O' && (given & (1 << 8)))
 615                             domaskpc = 1;
 616                           /* fall through */
 617                         case 'M':
 618                           {
 619                             int started = 0;
 620                             int reg;
 621                             func (stream, "{");
 622                             /* It would be nice if we could spot
 623                                ranges, and generate the rS-rE format: */
 624                             for (reg = 0; (reg < 8); reg++)
 625                               if ((given & (1 << reg)) != 0)
 626                                 {
 627                                   if (started)
 628                                     func (stream, ", ");
 629                                   started = 1;
 630                                   func (stream, "%s", arm_regnames[reg]);
 631                                 }
 632
 633                             if (domasklr)
 634                               {
 635                                 if (started)
 636                                   func (stream, ", ");
 637                                 started = 1;
 638                                 func (stream, "lr");
 639                               }
 640
 641                             if (domaskpc)
 642                               {
 643                                 if (started)
 644                                   func (stream, ", ");
 645                                 func (stream, "pc");
 646                               }
 647
 648                             func (stream, "}");
 649                           }
 650                           break;
 651
 652
 653                         case '0': case '1': case '2': case '3': case '4':
 654                         case '5': case '6': case '7': case '8': case '9':
 655                           {
 656                             int bitstart = *c++ - '0';
 657                             int bitend = 0;
 658                             while (*c >= '0' && *c <= '9')
 659                               bitstart = (bitstart * 10) + *c++ - '0';
 660
 661                             switch (*c)
 662                               {
 663                               case '-':
 664                                 {
 665                                   long reg;
 666                                   c++;
 667                                   while (*c >= '0' && *c <= '9')
 668                                     bitend = (bitend * 10) + *c++ - '0';
 669                                   if (!bitend)
 670                                     abort ();
 671                                   reg = given >> bitstart;
 672                                   reg &= (2 << (bitend - bitstart)) - 1;
 673                                   switch (*c)
 674                                     {
 675                                     case 'r':
 676                                       func (stream, "%s", arm_regnames[reg]);
 677                                       break;
 678
 679                                     case 'd':
 680                                       func (stream, "%d", reg);
 681                                       break;
 682
 683                                     case 'H':
 684                                       func (stream, "%d", reg << 1);
 685                                       break;
 686
 687                                     case 'W':
 688                                       func (stream, "%d", reg << 2);
 689                                       break;
 690
 691                                     case 'a':
 692                                       /* PC-relative address -- the bottom two
 693                                          bits of the address are dropped before
 694                                          the calculation.  */
 695                                       info->print_address_func
 696                                         (((pc + 4) & ~3) + (reg << 2), info);
 697                                       break;
 698
 699                                     case 'x':
 700                                       func (stream, "0x%04x", reg);
 701                                       break;
 702
 703                                     case 'I':
 704                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 705                                       func (stream, "%d", reg);
 706                                       break;
 707
 708                                     case 'B':
 709                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 710                                       (*info->print_address_func)
 711                                         (reg * 2 + pc + 4, info);
 712                                       break;
 713
 714                                     default:
 715                                       abort();
 716                                     }
 717                                 }
 718                                 break;
 719
 720                               case '\'':
 721                                 c++;
 722                                 if ((given & (1 << bitstart)) != 0)
 723                                   func (stream, "%c", *c);
 724                                 break;
 725
 726                               case '?':
 727                                 ++c;
 728                                 if ((given & (1 << bitstart)) != 0)
 729                                   func (stream, "%c", *c++);
 730                                 else
 731                                   func (stream, "%c", *++c);
 732                                 break;
 733
 734                               default:
 735                                  abort();
 736                               }
 737                           }
 738                           break;
 739
 740                         default:
 741                           abort ();
 742                         }
 743                     }
 744                   else
 745                     func (stream, "%c", *c);
 746                 }
 747              }
 748           return 2;
 749        }
 750     }
 751
 752   /* no match */
 753   abort ();
 754 }
 755
 756 /* Select a different register name set.
 757    Returns true if the name set selected is the APCS name set.  */
 758 int
 759 arm_toggle_regnames ()
 760 {
 761   if (arm_regnames == arm_regnames_standard)
 762     arm_regnames = arm_regnames_apcs;
 763   else
 764     arm_regnames = arm_regnames_standard;
 765
 766   return arm_regnames == arm_regnames_apcs;
 767 }
 768
 769 static void
 770 parse_disassembler_options (options)
 771      char * options;
 772 {
 773   if (options == NULL)
 774     return;
 775
 776   if (strncmp (options, "reg-names-", 10) == 0)
 777     {
 778       options += 10;
 779
 780       if (strcmp (options, "std") == 0)
 781         arm_regnames = arm_regnames_standard;
 782       else if (strcmp (options, "apcs") == 0)
 783         arm_regnames = arm_regnames_apcs;
 784       else if (strcmp (options, "raw") == 0)
 785         arm_regnames = arm_regnames_raw;
 786       else
 787         fprintf (stderr, "Unrecognised register name set: %s\n", options);
 788     }
 789   else
 790     fprintf (stderr, "Unrecognised disassembler option: %s\n", options);
 791
 792   return;
 793 }
 794
 795 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
 796
 797 int
 798 print_insn_big_arm (pc, info)
 799      bfd_vma pc;
 800      struct disassemble_info *info;
 801 {
 802   unsigned char      b[4];
 803   long               given;
 804   int                status;
 805   coff_symbol_type   *cs;
 806   elf_symbol_type    *es;
 807   int                is_thumb;
 808
 809   if (info->disassembler_options)
 810     {
 811       parse_disassembler_options (info->disassembler_options);
 812
 813       /* To avoid repeated parsing of this option, we remove it here.  */
 814       info->disassembler_options = NULL;
 815     }
 816
 817   is_thumb = false;
 818   if (info->symbols != NULL)
 819     {
 820     if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 821      {
 822        cs = coffsymbol (*info->symbols);
 823        is_thumb = (cs->native->u.syment.n_sclass == C_THUMBEXT
 824                    || cs->native->u.syment.n_sclass == C_THUMBSTAT
 825                    || cs->native->u.syment.n_sclass == C_THUMBLABEL
 826                    || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 827                    || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 828
 829      }
 830     else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 831      {
 832        es = *(elf_symbol_type **)(info->symbols);
 833        is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 834          STT_ARM_TFUNC;
 835       }
 836    }
 837
 838   info->bytes_per_chunk = 4;
 839   info->display_endian = BFD_ENDIAN_BIG;
 840
 841   /* Always fetch word aligned values.  */
 842
 843   status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
 844   if (status != 0)
 845     {
 846       (*info->memory_error_func) (status, pc, info);
 847       return -1;
 848     }
 849
 850   if (is_thumb)
 851     {
 852       if (pc & 0x2)
 853         {
 854           given = (b[2] << 8) | b[3];
 855
 856           status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
 857           if (status != 0)
 858             {
 859               info->memory_error_func (status, pc + 4, info);
 860               return -1;
 861             }
 862
 863           given |= (b[0] << 24) | (b[1] << 16);
 864         }
 865       else
 866         {
 867           given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
 868         }
 869     }
 870   else
 871     {
 872       given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 873     }
 874
 875   if (is_thumb)
 876     {
 877       status = print_insn_thumb (pc, info, given);
 878     }
 879   else
 880     {
 881       status = print_insn_arm (pc, info, given);
 882     }
 883
 884   return status;
 885 }
 886
 887 int
 888 print_insn_little_arm (pc, info)
 889      bfd_vma pc;
 890      struct disassemble_info * info;
 891 {
 892   unsigned char      b[4];
 893   long               given;
 894   int                status;
 895   coff_symbol_type   *cs;
 896   elf_symbol_type    *es;
 897   int                is_thumb;
 898
 899   if (info->disassembler_options)
 900     {
 901       parse_disassembler_options (info->disassembler_options);
 902
 903       /* To avoid repeated parsing of this option, we remove it here.  */
 904       info->disassembler_options = NULL;
 905     }
 906
 907   is_thumb = false;
 908   if (info->symbols != NULL)
 909     {
 910     if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 911      {
 912        cs = coffsymbol (*info->symbols);
 913        is_thumb = (cs->native->u.syment.n_sclass == C_THUMBEXT
 914                    || cs->native->u.syment.n_sclass == C_THUMBSTAT
 915                    || cs->native->u.syment.n_sclass == C_THUMBLABEL
 916                    || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 917                    || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 918
 919      }
 920     else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 921      {
 922        es = *(elf_symbol_type **)(info->symbols);
 923        is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 924          STT_ARM_TFUNC;
 925       }
 926    }
 927
 928   info->bytes_per_chunk = 4;
 929   info->display_endian = BFD_ENDIAN_LITTLE;
 930
 931   status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
 932   if (status != 0 && is_thumb)
 933     {
 934       info->bytes_per_chunk = 2;
 935
 936       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 937       b[3] = b[2] = 0;
 938     }
 939   if (status != 0)
 940     {
 941       (*info->memory_error_func) (status, pc, info);
 942       return -1;
 943     }
 944
 945   given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 946
 947   if (is_thumb)
 948     {
 949       status = print_insn_thumb (pc, info, given);
 950     }
 951   else
 952     {
 953       status = print_insn_arm (pc, info, given);
 954     }
 955
 956   return status;
 957 }