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
  60   PARAMS ((bfd_vma, struct disassemble_info *, 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
  70   if ((given & 0xff0) != 0)
  71     {
  72       if ((given & 0x10) == 0)
  73         {
  74           int amount = (given & 0xf80) >> 7;
  75           int shift = (given & 0x60) >> 5;
  76
  77           if (amount == 0)
  78             {
  79               if (shift == 3)
  80                 {
  81                   func (stream, ", rrx");
  82                   return;
  83                 }
  84
  85               amount = 32;
  86             }
  87
  88           func (stream, ", %s #%d", arm_shift[shift], amount);
  89         }
  90       else
  91         func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
  92               arm_regnames[(given & 0xf00) >> 8]);
  93     }
  94 }
  95
  96 /* Print one instruction from PC on INFO->STREAM.
  97    Return the size of the instruction (always 4 on ARM). */
  98
  99 static int
 100 print_insn_arm (pc, info, given)
 101      bfd_vma                   pc;
 102      struct disassemble_info * info;
 103      long                      given;
 104 {
 105   struct arm_opcode *  insn;
 106   void *               stream = info->stream;
 107   fprintf_ftype        func   = info->fprintf_func;
 108
 109   for (insn = arm_opcodes; insn->assembler; insn++)
 110     {
 111       if ((given & insn->mask) == insn->value)
 112         {
 113           char * c;
 114
 115           for (c = insn->assembler; *c; c++)
 116             {
 117               if (*c == '%')
 118                 {
 119                   switch (*++c)
 120                     {
 121                     case '%':
 122                       func (stream, "%%");
 123                       break;
 124
 125                     case 'a':
 126                       if (((given & 0x000f0000) == 0x000f0000)
 127                           && ((given & 0x02000000) == 0))
 128                         {
 129                           int offset = given & 0xfff;
 130
 131                           func (stream, "[pc");
 132
 133                           if (given & 0x01000000)
 134                             {
 135                               if ((given & 0x00800000) == 0)
 136                                 offset = - offset;
 137
 138                               /* pre-indexed */
 139                               func (stream, ", #%x]", offset);
 140
 141                               offset += pc + 8;
 142
 143                               /* Cope with the possibility of write-back being used.
 144                                  Probably a very dangerous thing for the programmer
 145                                  to do, but who are we to argue ?  */
 146                               if (given & 0x00200000)
 147                                 func (stream, "!");
 148                             }
 149                           else
 150                             {
 151                               /* post indexed */
 152                               func (stream, "], #%x", offset);
 153
 154                               offset = pc + 8;  /* ie ignore the offset */
 155                             }
 156
 157                           func (stream, "\t; ");
 158                           info->print_address_func (offset, info);
 159                         }
 160                       else
 161                         {
 162                           func (stream, "[%s",
 163                                 arm_regnames[(given >> 16) & 0xf]);
 164                           if ((given & 0x01000000) != 0)
 165                             {
 166                               if ((given & 0x02000000) == 0)
 167                                 {
 168                                   int offset = given & 0xfff;
 169                                   if (offset)
 170                                     func (stream, ", %s#%d",
 171                                           (((given & 0x00800000) == 0)
 172                                            ? "-" : ""), offset);
 173                                 }
 174                               else
 175                                 {
 176                                   func (stream, ", %s",
 177                                         (((given & 0x00800000) == 0)
 178                                          ? "-" : ""));
 179                                   arm_decode_shift (given, func, stream);
 180                                 }
 181
 182                               func (stream, "]%s",
 183                                     ((given & 0x00200000) != 0) ? "!" : "");
 184                             }
 185                           else
 186                             {
 187                               if ((given & 0x02000000) == 0)
 188                                 {
 189                                   int offset = given & 0xfff;
 190                                   if (offset)
 191                                     func (stream, "], %s#%d",
 192                                           (((given & 0x00800000) == 0)
 193                                            ? "-" : ""), offset);
 194                                   else
 195                                     func (stream, "]");
 196                                 }
 197                               else
 198                                 {
 199                                   func (stream, "], %s",
 200                                         (((given & 0x00800000) == 0)
 201                                          ? "-" : ""));
 202                                   arm_decode_shift (given, func, stream);
 203                                 }
 204                             }
 205                         }
 206                       break;
 207
 208                     case 's':
 209                       if ((given & 0x004f0000) == 0x004f0000)
 210                         {
 211                           /* PC relative with immediate offset */
 212                           int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 213
 214                           if ((given & 0x00800000) == 0)
 215                             offset = -offset;
 216
 217                           func (stream, "[pc, #%x]\t; ", offset);
 218
 219                           (*info->print_address_func)
 220                             (offset + pc + 8, info);
 221                         }
 222                       else
 223                         {
 224                           func (stream, "[%s",
 225                                 arm_regnames[(given >> 16) & 0xf]);
 226                           if ((given & 0x01000000) != 0)
 227                             {
 228                               /* pre-indexed */
 229                               if ((given & 0x00400000) == 0x00400000)
 230                                 {
 231                                   /* immediate */
 232                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 233                                   if (offset)
 234                                     func (stream, ", %s#%d",
 235                                           (((given & 0x00800000) == 0)
 236                                            ? "-" : ""), offset);
 237                                 }
 238                               else
 239                                 {
 240                                   /* register */
 241                                   func (stream, ", %s%s",
 242                                         (((given & 0x00800000) == 0)
 243                                          ? "-" : ""),
 244                                         arm_regnames[given & 0xf]);
 245                                 }
 246
 247                               func (stream, "]%s",
 248                                     ((given & 0x00200000) != 0) ? "!" : "");
 249                             }
 250                           else
 251                             {
 252                               /* post-indexed */
 253                               if ((given & 0x00400000) == 0x00400000)
 254                                 {
 255                                   /* immediate */
 256                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 257                                   if (offset)
 258                                     func (stream, "], %s#%d",
 259                                           (((given & 0x00800000) == 0)
 260                                            ? "-" : ""), offset);
 261                                   else
 262                                     func (stream, "]");
 263                                 }
 264                               else
 265                                 {
 266                                   /* register */
 267                                   func (stream, "], %s%s",
 268                                         (((given & 0x00800000) == 0)
 269                                          ? "-" : ""),
 270                                         arm_regnames[given & 0xf]);
 271                                 }
 272                             }
 273                         }
 274                       break;
 275
 276                     case 'b':
 277                       (*info->print_address_func)
 278                         (BDISP (given) * 4 + pc + 8, info);
 279                       break;
 280
 281                     case 'c':
 282                       func (stream, "%s",
 283                             arm_conditional [(given >> 28) & 0xf]);
 284                       break;
 285
 286                     case 'm':
 287                       {
 288                         int started = 0;
 289                         int reg;
 290
 291                         func (stream, "{");
 292                         for (reg = 0; reg < 16; reg++)
 293                           if ((given & (1 << reg)) != 0)
 294                             {
 295                               if (started)
 296                                 func (stream, ", ");
 297                               started = 1;
 298                               func (stream, "%s", arm_regnames[reg]);
 299                             }
 300                         func (stream, "}");
 301                       }
 302                       break;
 303
 304                     case 'o':
 305                       if ((given & 0x02000000) != 0)
 306                         {
 307                           int rotate = (given & 0xf00) >> 7;
 308                           int immed = (given & 0xff);
 309                           func (stream, "#%d",
 310                                 ((immed << (32 - rotate))
 311                                  | (immed >> rotate)) & 0xffffffff);
 312                         }
 313                       else
 314                         arm_decode_shift (given, func, stream);
 315                       break;
 316
 317                     case 'p':
 318                       if ((given & 0x0000f000) == 0x0000f000)
 319                         func (stream, "p");
 320                       break;
 321
 322                     case 't':
 323                       if ((given & 0x01200000) == 0x00200000)
 324                         func (stream, "t");
 325                       break;
 326
 327                     case 'h':
 328                       if ((given & 0x00000020) == 0x00000020)
 329                         func (stream, "h");
 330                       else
 331                         func (stream, "b");
 332                       break;
 333
 334                     case 'A':
 335                       func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
 336                       if ((given & 0x01000000) != 0)
 337                         {
 338                           int offset = given & 0xff;
 339                           if (offset)
 340                             func (stream, ", %s#%d]%s",
 341                                   ((given & 0x00800000) == 0 ? "-" : ""),
 342                                   offset * 4,
 343                                   ((given & 0x00200000) != 0 ? "!" : ""));
 344                           else
 345                             func (stream, "]");
 346                         }
 347                       else
 348                         {
 349                           int offset = given & 0xff;
 350                           if (offset)
 351                             func (stream, "], %s#%d",
 352                                   ((given & 0x00800000) == 0 ? "-" : ""),
 353                                   offset * 4);
 354                           else
 355                             func (stream, "]");
 356                         }
 357                       break;
 358
 359                     case 'C':
 360                       switch (given & 0x00090000)
 361                         {
 362                         default:
 363                           func (stream, "_???");
 364                           break;
 365                         case 0x90000:
 366                           func (stream, "_all");
 367                           break;
 368                         case 0x10000:
 369                           func (stream, "_ctl");
 370                           break;
 371                         case 0x80000:
 372                           func (stream, "_flg");
 373                           break;
 374                         }
 375                       break;
 376
 377                     case 'F':
 378                       switch (given & 0x00408000)
 379                         {
 380                         case 0:
 381                           func (stream, "4");
 382                           break;
 383                         case 0x8000:
 384                           func (stream, "1");
 385                           break;
 386                         case 0x00400000:
 387                           func (stream, "2");
 388                           break;
 389                         default:
 390                           func (stream, "3");
 391                         }
 392                       break;
 393
 394                     case 'P':
 395                       switch (given & 0x00080080)
 396                         {
 397                         case 0:
 398                           func (stream, "s");
 399                           break;
 400                         case 0x80:
 401                           func (stream, "d");
 402                           break;
 403                         case 0x00080000:
 404                           func (stream, "e");
 405                           break;
 406                         default:
 407                           func (stream, _("<illegal precision>"));
 408                           break;
 409                         }
 410                       break;
 411                     case 'Q':
 412                       switch (given & 0x00408000)
 413                         {
 414                         case 0:
 415                           func (stream, "s");
 416                           break;
 417                         case 0x8000:
 418                           func (stream, "d");
 419                           break;
 420                         case 0x00400000:
 421                           func (stream, "e");
 422                           break;
 423                         default:
 424                           func (stream, "p");
 425                           break;
 426                         }
 427                       break;
 428                     case 'R':
 429                       switch (given & 0x60)
 430                         {
 431                         case 0:
 432                           break;
 433                         case 0x20:
 434                           func (stream, "p");
 435                           break;
 436                         case 0x40:
 437                           func (stream, "m");
 438                           break;
 439                         default:
 440                           func (stream, "z");
 441                           break;
 442                         }
 443                       break;
 444
 445                     case '0': case '1': case '2': case '3': case '4':
 446                     case '5': case '6': case '7': case '8': case '9':
 447                       {
 448                         int bitstart = *c++ - '0';
 449                         int bitend = 0;
 450                         while (*c >= '0' && *c <= '9')
 451                           bitstart = (bitstart * 10) + *c++ - '0';
 452
 453                         switch (*c)
 454                           {
 455                           case '-':
 456                             c++;
 457                             while (*c >= '0' && *c <= '9')
 458                               bitend = (bitend * 10) + *c++ - '0';
 459                             if (!bitend)
 460                               abort ();
 461                             switch (*c)
 462                               {
 463                               case 'r':
 464                                 {
 465                                   long reg;
 466                                   reg = given >> bitstart;
 467                                   reg &= (2 << (bitend - bitstart)) - 1;
 468                                   func (stream, "%s", arm_regnames[reg]);
 469                                 }
 470                                 break;
 471                               case 'd':
 472                                 {
 473                                   long reg;
 474                                   reg = given >> bitstart;
 475                                   reg &= (2 << (bitend - bitstart)) - 1;
 476                                   func (stream, "%d", reg);
 477                                 }
 478                                 break;
 479                               case 'x':
 480                                 {
 481                                   long reg;
 482                                   reg = given >> bitstart;
 483                                   reg &= (2 << (bitend - bitstart)) - 1;
 484                                   func (stream, "0x%08x", reg);
 485
 486                                   /* Some SWI instructions have special meanings.  */
 487                                   if ((given & 0x0fffffff) == 0x0FF00000)
 488                                     func (stream, "\t; IMB");
 489                                   else if ((given & 0x0fffffff) == 0x0FF00001)
 490                                     func (stream, "\t; IMBRange");
 491                                 }
 492                                 break;
 493                               case 'f':
 494                                 {
 495                                   long reg;
 496                                   reg = given >> bitstart;
 497                                   reg &= (2 << (bitend - bitstart)) - 1;
 498                                   if (reg > 7)
 499                                     func (stream, "#%s",
 500                                           arm_fp_const[reg & 7]);
 501                                   else
 502                                     func (stream, "f%d", reg);
 503                                 }
 504                                 break;
 505                               default:
 506                                 abort ();
 507                               }
 508                             break;
 509                           case '`':
 510                             c++;
 511                             if ((given & (1 << bitstart)) == 0)
 512                               func (stream, "%c", *c);
 513                             break;
 514                           case '\'':
 515                             c++;
 516                             if ((given & (1 << bitstart)) != 0)
 517                               func (stream, "%c", *c);
 518                             break;
 519                           case '?':
 520                             ++c;
 521                             if ((given & (1 << bitstart)) != 0)
 522                               func (stream, "%c", *c++);
 523                             else
 524                               func (stream, "%c", *++c);
 525                             break;
 526                           default:
 527                             abort ();
 528                           }
 529                         break;
 530
 531                       default:
 532                         abort ();
 533                       }
 534                     }
 535                 }
 536               else
 537                 func (stream, "%c", *c);
 538             }
 539           return 4;
 540         }
 541     }
 542   abort ();
 543 }
 544
 545 /* Print one instruction from PC on INFO->STREAM.
 546    Return the size of the instruction. */
 547
 548 static int
 549 print_insn_thumb (pc, info, given)
 550      bfd_vma                   pc;
 551      struct disassemble_info * info;
 552      long                      given;
 553 {
 554   struct thumb_opcode * insn;
 555   void *                stream = info->stream;
 556   fprintf_ftype         func = info->fprintf_func;
 557
 558   for (insn = thumb_opcodes; insn->assembler; insn++)
 559     {
 560       if ((given & insn->mask) == insn->value)
 561         {
 562           char * c = insn->assembler;
 563
 564           /* Special processing for Thumb 2 instruction BL sequence: */
 565           if (!*c) /* check for empty (not NULL) assembler string */
 566             {
 567               info->bytes_per_chunk = 4;
 568               info->bytes_per_line  = 4;
 569
 570               func (stream, "%04x\tbl\t", given & 0xffff);
 571               (*info->print_address_func)
 572                 (BDISP23 (given) * 2 + pc + 4, info);
 573               return 4;
 574             }
 575           else
 576             {
 577               info->bytes_per_chunk = 2;
 578               info->bytes_per_line  = 4;
 579
 580               given &= 0xffff;
 581               func (stream, "%04x\t", given);
 582
 583               for (; *c; c++)
 584                 {
 585                   if (*c == '%')
 586                     {
 587                       int domaskpc = 0;
 588                       int domasklr = 0;
 589
 590                       switch (*++c)
 591                         {
 592                         case '%':
 593                           func (stream, "%%");
 594                           break;
 595
 596                         case 'S':
 597                           {
 598                             long reg;
 599                             reg = (given >> 3) & 0x7;
 600                             if (given & (1 << 6))
 601                               reg += 8;
 602                             func (stream, "%s", arm_regnames[reg]);
 603                           }
 604                           break;
 605
 606                         case 'D':
 607                           {
 608                             long reg;
 609
 610                             reg = given & 0x7;
 611                             if (given & (1 << 7))
 612                              reg += 8;
 613                             func (stream, "%s", arm_regnames[reg]);
 614                           }
 615                           break;
 616
 617                         case 'T':
 618                           func (stream, "%s",
 619                                 arm_conditional [(given >> 8) & 0xf]);
 620                           break;
 621
 622                         case 'N':
 623                           if (given & (1 << 8))
 624                             domasklr = 1;
 625                           /* fall through */
 626                         case 'O':
 627                           if (*c == 'O' && (given & (1 << 8)))
 628                             domaskpc = 1;
 629                           /* fall through */
 630                         case 'M':
 631                           {
 632                             int started = 0;
 633                             int reg;
 634
 635                             func (stream, "{");
 636                             /* It would be nice if we could spot
 637                                ranges, and generate the rS-rE format: */
 638                             for (reg = 0; (reg < 8); reg++)
 639                               if ((given & (1 << reg)) != 0)
 640                                 {
 641                                   if (started)
 642                                     func (stream, ", ");
 643                                   started = 1;
 644                                   func (stream, "%s", arm_regnames[reg]);
 645                                 }
 646
 647                             if (domasklr)
 648                               {
 649                                 if (started)
 650                                   func (stream, ", ");
 651                                 started = 1;
 652                                 func (stream, "lr");
 653                               }
 654
 655                             if (domaskpc)
 656                               {
 657                                 if (started)
 658                                   func (stream, ", ");
 659                                 func (stream, "pc");
 660                               }
 661
 662                             func (stream, "}");
 663                           }
 664                           break;
 665
 666
 667                         case '0': case '1': case '2': case '3': case '4':
 668                         case '5': case '6': case '7': case '8': case '9':
 669                           {
 670                             int bitstart = *c++ - '0';
 671                             int bitend = 0;
 672
 673                             while (*c >= '0' && *c <= '9')
 674                               bitstart = (bitstart * 10) + *c++ - '0';
 675
 676                             switch (*c)
 677                               {
 678                               case '-':
 679                                 {
 680                                   long reg;
 681
 682                                   c++;
 683                                   while (*c >= '0' && *c <= '9')
 684                                     bitend = (bitend * 10) + *c++ - '0';
 685                                   if (!bitend)
 686                                     abort ();
 687                                   reg = given >> bitstart;
 688                                   reg &= (2 << (bitend - bitstart)) - 1;
 689                                   switch (*c)
 690                                     {
 691                                     case 'r':
 692                                       func (stream, "%s", arm_regnames[reg]);
 693                                       break;
 694
 695                                     case 'd':
 696                                       func (stream, "%d", reg);
 697                                       break;
 698
 699                                     case 'H':
 700                                       func (stream, "%d", reg << 1);
 701                                       break;
 702
 703                                     case 'W':
 704                                       func (stream, "%d", reg << 2);
 705                                       break;
 706
 707                                     case 'a':
 708                                       /* PC-relative address -- the bottom two
 709                                          bits of the address are dropped before
 710                                          the calculation.  */
 711                                       info->print_address_func
 712                                         (((pc + 4) & ~3) + (reg << 2), info);
 713                                       break;
 714
 715                                     case 'x':
 716                                       func (stream, "0x%04x", reg);
 717                                       break;
 718
 719                                     case 'I':
 720                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 721                                       func (stream, "%d", reg);
 722                                       break;
 723
 724                                     case 'B':
 725                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 726                                       (*info->print_address_func)
 727                                         (reg * 2 + pc + 4, info);
 728                                       break;
 729
 730                                     default:
 731                                       abort ();
 732                                     }
 733                                 }
 734                                 break;
 735
 736                               case '\'':
 737                                 c++;
 738                                 if ((given & (1 << bitstart)) != 0)
 739                                   func (stream, "%c", *c);
 740                                 break;
 741
 742                               case '?':
 743                                 ++c;
 744                                 if ((given & (1 << bitstart)) != 0)
 745                                   func (stream, "%c", *c++);
 746                                 else
 747                                   func (stream, "%c", *++c);
 748                                 break;
 749
 750                               default:
 751                                  abort ();
 752                               }
 753                           }
 754                           break;
 755
 756                         default:
 757                           abort ();
 758                         }
 759                     }
 760                   else
 761                     func (stream, "%c", *c);
 762                 }
 763              }
 764           return 2;
 765        }
 766     }
 767
 768   /* no match */
 769   abort ();
 770 }
 771
 772 /* Select a different register name set.
 773    Returns true if the name set selected is the APCS name set.  */
 774 int
 775 arm_toggle_regnames ()
 776 {
 777   if (arm_regnames == arm_regnames_standard)
 778     arm_regnames = arm_regnames_apcs;
 779   else
 780     arm_regnames = arm_regnames_standard;
 781
 782   return arm_regnames == arm_regnames_apcs;
 783 }
 784
 785 static void
 786 parse_disassembler_options (options)
 787      char * options;
 788 {
 789   if (options == NULL)
 790     return;
 791
 792   if (strncmp (options, "reg-names-", 10) == 0)
 793     {
 794       options += 10;
 795
 796       if (strcmp (options, "std") == 0)
 797         arm_regnames = arm_regnames_standard;
 798       else if (strcmp (options, "apcs") == 0)
 799         arm_regnames = arm_regnames_apcs;
 800       else if (strcmp (options, "raw") == 0)
 801         arm_regnames = arm_regnames_raw;
 802       else
 803         fprintf (stderr, "Unrecognised register name set: %s\n", options);
 804     }
 805   else
 806     fprintf (stderr, "Unrecognised disassembler option: %s\n", options);
 807
 808   return;
 809 }
 810
 811 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
 812
 813 int
 814 print_insn_big_arm (pc, info)
 815      bfd_vma pc;
 816      struct disassemble_info * info;
 817 {
 818   unsigned char      b[4];
 819   long               given;
 820   int                status;
 821   coff_symbol_type * cs;
 822   elf_symbol_type *  es;
 823   int                is_thumb;
 824
 825   if (info->disassembler_options)
 826     {
 827       parse_disassembler_options (info->disassembler_options);
 828
 829       /* To avoid repeated parsing of this option, we remove it here.  */
 830       info->disassembler_options = NULL;
 831     }
 832
 833   is_thumb = false;
 834   if (info->symbols != NULL)
 835     {
 836       if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 837         {
 838           cs = coffsymbol (*info->symbols);
 839           is_thumb = (   cs->native->u.syment.n_sclass == C_THUMBEXT
 840                       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 841                       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 842                       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 843                       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 844         }
 845       else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 846         {
 847           es = *(elf_symbol_type **)(info->symbols);
 848           is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 849             STT_ARM_TFUNC;
 850         }
 851     }
 852
 853   info->bytes_per_chunk = 4;
 854   info->display_endian = BFD_ENDIAN_BIG;
 855
 856   /* Always fetch word aligned values.  */
 857
 858   status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
 859   if (status != 0)
 860     {
 861       (*info->memory_error_func) (status, pc, info);
 862       return -1;
 863     }
 864
 865   if (is_thumb)
 866     {
 867       if (pc & 0x2)
 868         {
 869           given = (b[2] << 8) | b[3];
 870
 871           status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
 872           if (status != 0)
 873             {
 874               info->memory_error_func (status, pc + 4, info);
 875               return -1;
 876             }
 877
 878           given |= (b[0] << 24) | (b[1] << 16);
 879         }
 880       else
 881         given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
 882     }
 883   else
 884     given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 885
 886   if (is_thumb)
 887     status = print_insn_thumb (pc, info, given);
 888   else
 889     status = print_insn_arm (pc, info, given);
 890
 891   return status;
 892 }
 893
 894 int
 895 print_insn_little_arm (pc, info)
 896      bfd_vma pc;
 897      struct disassemble_info * info;
 898 {
 899   unsigned char      b[4];
 900   long               given;
 901   int                status;
 902   coff_symbol_type * cs;
 903   elf_symbol_type *  es;
 904   int                is_thumb;
 905
 906   if (info->disassembler_options)
 907     {
 908       parse_disassembler_options (info->disassembler_options);
 909
 910       /* To avoid repeated parsing of this option, we remove it here.  */
 911       info->disassembler_options = NULL;
 912     }
 913
 914   is_thumb = false;
 915
 916   if (info->symbols != NULL)
 917     {
 918       if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 919         {
 920           cs = coffsymbol (*info->symbols);
 921           is_thumb = (   cs->native->u.syment.n_sclass == C_THUMBEXT
 922                       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 923                       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 924                       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 925                       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 926         }
 927       else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 928         {
 929           es = *(elf_symbol_type **)(info->symbols);
 930           is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 931             STT_ARM_TFUNC;
 932         }
 933     }
 934
 935   info->bytes_per_chunk = 4;
 936   info->display_endian = BFD_ENDIAN_LITTLE;
 937
 938   status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
 939   if (status != 0 && is_thumb)
 940     {
 941       info->bytes_per_chunk = 2;
 942
 943       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 944       b[3] = b[2] = 0;
 945     }
 946   if (status != 0)
 947     {
 948       (*info->memory_error_func) (status, pc, info);
 949       return -1;
 950     }
 951
 952   given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 953
 954   if (is_thumb)
 955     status = print_insn_thumb (pc, info, given);
 956   else
 957     status = print_insn_arm (pc, info, given);
 958
 959   return status;
 960 }