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