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 "sysdep.h"
  23 #include "dis-asm.h"
  24 #define DEFINE_TABLE
  25 #include "arm-opc.h"
  26 #include "coff/internal.h"
  27 #include "libcoff.h"
  28 #include "opintl.h"
  29
  30 /* FIXME: This shouldn't be done here */
  31 #include "elf-bfd.h"
  32 #include "elf/internal.h"
  33 #include "elf/arm.h"
  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_raw[] =
  40 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  41  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"};
  42
  43 static char * arm_regnames_standard[] =
  44 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  45  "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc"};
  46
  47 static char * arm_regnames_apcs[] =
  48 {"a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4",
  49  "v5", "v6", "sl", "fp", "ip", "sp", "lr", "pc"};
  50
  51 /* Choose which register name set to use.  */
  52 static char ** arm_regnames = arm_regnames_standard;
  53
  54 static char * arm_fp_const[] =
  55 {"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
  56
  57 static char * arm_shift[] =
  58 {"lsl", "lsr", "asr", "ror"};
  59
  60 static int print_insn_arm
  61   PARAMS ((bfd_vma, struct disassemble_info *, long));
  62
  63 static void
  64 arm_decode_shift (given, func, stream)
  65      long given;
  66      fprintf_ftype func;
  67      void * stream;
  68 {
  69   func (stream, "%s", arm_regnames[given & 0xf]);
  70
  71   if ((given & 0xff0) != 0)
  72     {
  73       if ((given & 0x10) == 0)
  74         {
  75           int amount = (given & 0xf80) >> 7;
  76           int shift = (given & 0x60) >> 5;
  77
  78           if (amount == 0)
  79             {
  80               if (shift == 3)
  81                 {
  82                   func (stream, ", rrx");
  83                   return;
  84                 }
  85
  86               amount = 32;
  87             }
  88
  89           func (stream, ", %s #%d", arm_shift[shift], amount);
  90         }
  91       else
  92         func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
  93               arm_regnames[(given & 0xf00) >> 8]);
  94     }
  95 }
  96
  97 /* Print one instruction from PC on INFO->STREAM.
  98    Return the size of the instruction (always 4 on ARM). */
  99
 100 static int
 101 print_insn_arm (pc, info, given)
 102      bfd_vma                   pc;
 103      struct disassemble_info * info;
 104      long                      given;
 105 {
 106   struct arm_opcode *  insn;
 107   void *               stream = info->stream;
 108   fprintf_ftype        func   = info->fprintf_func;
 109
 110   for (insn = arm_opcodes; insn->assembler; insn++)
 111     {
 112       if ((given & insn->mask) == insn->value)
 113         {
 114           char * c;
 115
 116           for (c = insn->assembler; *c; c++)
 117             {
 118               if (*c == '%')
 119                 {
 120                   switch (*++c)
 121                     {
 122                     case '%':
 123                       func (stream, "%%");
 124                       break;
 125
 126                     case 'a':
 127                       if (((given & 0x000f0000) == 0x000f0000)
 128                           && ((given & 0x02000000) == 0))
 129                         {
 130                           int offset = given & 0xfff;
 131
 132                           func (stream, "[pc");
 133
 134                           if (given & 0x01000000)
 135                             {
 136                               if ((given & 0x00800000) == 0)
 137                                 offset = - offset;
 138
 139                               /* pre-indexed */
 140                               func (stream, ", #%x]", offset);
 141
 142                               offset += pc + 8;
 143
 144                               /* Cope with the possibility of write-back being used.
 145                                  Probably a very dangerous thing for the programmer
 146                                  to do, but who are we to argue ?  */
 147                               if (given & 0x00200000)
 148                                 func (stream, "!");
 149                             }
 150                           else
 151                             {
 152                               /* post indexed */
 153                               func (stream, "], #%x", offset);
 154
 155                               offset = pc + 8;  /* ie ignore the offset */
 156                             }
 157
 158                           func (stream, "\t; ");
 159                           info->print_address_func (offset, info);
 160                         }
 161                       else
 162                         {
 163                           func (stream, "[%s",
 164                                 arm_regnames[(given >> 16) & 0xf]);
 165                           if ((given & 0x01000000) != 0)
 166                             {
 167                               if ((given & 0x02000000) == 0)
 168                                 {
 169                                   int offset = given & 0xfff;
 170                                   if (offset)
 171                                     func (stream, ", %s#%d",
 172                                           (((given & 0x00800000) == 0)
 173                                            ? "-" : ""), offset);
 174                                 }
 175                               else
 176                                 {
 177                                   func (stream, ", %s",
 178                                         (((given & 0x00800000) == 0)
 179                                          ? "-" : ""));
 180                                   arm_decode_shift (given, func, stream);
 181                                 }
 182
 183                               func (stream, "]%s",
 184                                     ((given & 0x00200000) != 0) ? "!" : "");
 185                             }
 186                           else
 187                             {
 188                               if ((given & 0x02000000) == 0)
 189                                 {
 190                                   int offset = given & 0xfff;
 191                                   if (offset)
 192                                     func (stream, "], %s#%d",
 193                                           (((given & 0x00800000) == 0)
 194                                            ? "-" : ""), offset);
 195                                   else
 196                                     func (stream, "]");
 197                                 }
 198                               else
 199                                 {
 200                                   func (stream, "], %s",
 201                                         (((given & 0x00800000) == 0)
 202                                          ? "-" : ""));
 203                                   arm_decode_shift (given, func, stream);
 204                                 }
 205                             }
 206                         }
 207                       break;
 208
 209                     case 's':
 210                       if ((given & 0x004f0000) == 0x004f0000)
 211                         {
 212                           /* PC relative with immediate offset */
 213                           int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 214
 215                           if ((given & 0x00800000) == 0)
 216                             offset = -offset;
 217
 218                           func (stream, "[pc, #%x]\t; ", offset);
 219
 220                           (*info->print_address_func)
 221                             (offset + pc + 8, info);
 222                         }
 223                       else
 224                         {
 225                           func (stream, "[%s",
 226                                 arm_regnames[(given >> 16) & 0xf]);
 227                           if ((given & 0x01000000) != 0)
 228                             {
 229                               /* pre-indexed */
 230                               if ((given & 0x00400000) == 0x00400000)
 231                                 {
 232                                   /* immediate */
 233                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 234                                   if (offset)
 235                                     func (stream, ", %s#%d",
 236                                           (((given & 0x00800000) == 0)
 237                                            ? "-" : ""), offset);
 238                                 }
 239                               else
 240                                 {
 241                                   /* register */
 242                                   func (stream, ", %s%s",
 243                                         (((given & 0x00800000) == 0)
 244                                          ? "-" : ""),
 245                                         arm_regnames[given & 0xf]);
 246                                 }
 247
 248                               func (stream, "]%s",
 249                                     ((given & 0x00200000) != 0) ? "!" : "");
 250                             }
 251                           else
 252                             {
 253                               /* post-indexed */
 254                               if ((given & 0x00400000) == 0x00400000)
 255                                 {
 256                                   /* immediate */
 257                                   int offset = ((given & 0xf00) >> 4) | (given & 0xf);
 258                                   if (offset)
 259                                     func (stream, "], %s#%d",
 260                                           (((given & 0x00800000) == 0)
 261                                            ? "-" : ""), offset);
 262                                   else
 263                                     func (stream, "]");
 264                                 }
 265                               else
 266                                 {
 267                                   /* register */
 268                                   func (stream, "], %s%s",
 269                                         (((given & 0x00800000) == 0)
 270                                          ? "-" : ""),
 271                                         arm_regnames[given & 0xf]);
 272                                 }
 273                             }
 274                         }
 275                       break;
 276
 277                     case 'b':
 278                       (*info->print_address_func)
 279                         (BDISP (given) * 4 + pc + 8, info);
 280                       break;
 281
 282                     case 'c':
 283                       func (stream, "%s",
 284                             arm_conditional [(given >> 28) & 0xf]);
 285                       break;
 286
 287                     case 'm':
 288                       {
 289                         int started = 0;
 290                         int reg;
 291
 292                         func (stream, "{");
 293                         for (reg = 0; reg < 16; reg++)
 294                           if ((given & (1 << reg)) != 0)
 295                             {
 296                               if (started)
 297                                 func (stream, ", ");
 298                               started = 1;
 299                               func (stream, "%s", arm_regnames[reg]);
 300                             }
 301                         func (stream, "}");
 302                       }
 303                       break;
 304
 305                     case 'o':
 306                       if ((given & 0x02000000) != 0)
 307                         {
 308                           int rotate = (given & 0xf00) >> 7;
 309                           int immed = (given & 0xff);
 310                           func (stream, "#%d",
 311                                 ((immed << (32 - rotate))
 312                                  | (immed >> rotate)) & 0xffffffff);
 313                         }
 314                       else
 315                         arm_decode_shift (given, func, stream);
 316                       break;
 317
 318                     case 'p':
 319                       if ((given & 0x0000f000) == 0x0000f000)
 320                         func (stream, "p");
 321                       break;
 322
 323                     case 't':
 324                       if ((given & 0x01200000) == 0x00200000)
 325                         func (stream, "t");
 326                       break;
 327
 328                     case 'h':
 329                       if ((given & 0x00000020) == 0x00000020)
 330                         func (stream, "h");
 331                       else
 332                         func (stream, "b");
 333                       break;
 334
 335                     case 'A':
 336                       func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
 337                       if ((given & 0x01000000) != 0)
 338                         {
 339                           int offset = given & 0xff;
 340                           if (offset)
 341                             func (stream, ", %s#%d]%s",
 342                                   ((given & 0x00800000) == 0 ? "-" : ""),
 343                                   offset * 4,
 344                                   ((given & 0x00200000) != 0 ? "!" : ""));
 345                           else
 346                             func (stream, "]");
 347                         }
 348                       else
 349                         {
 350                           int offset = given & 0xff;
 351                           if (offset)
 352                             func (stream, "], %s#%d",
 353                                   ((given & 0x00800000) == 0 ? "-" : ""),
 354                                   offset * 4);
 355                           else
 356                             func (stream, "]");
 357                         }
 358                       break;
 359
 360                     case 'C':
 361                       switch (given & 0x00090000)
 362                         {
 363                         default:
 364                           func (stream, "_???");
 365                           break;
 366                         case 0x90000:
 367                           func (stream, "_all");
 368                           break;
 369                         case 0x10000:
 370                           func (stream, "_ctl");
 371                           break;
 372                         case 0x80000:
 373                           func (stream, "_flg");
 374                           break;
 375                         }
 376                       break;
 377
 378                     case 'F':
 379                       switch (given & 0x00408000)
 380                         {
 381                         case 0:
 382                           func (stream, "4");
 383                           break;
 384                         case 0x8000:
 385                           func (stream, "1");
 386                           break;
 387                         case 0x00400000:
 388                           func (stream, "2");
 389                           break;
 390                         default:
 391                           func (stream, "3");
 392                         }
 393                       break;
 394
 395                     case 'P':
 396                       switch (given & 0x00080080)
 397                         {
 398                         case 0:
 399                           func (stream, "s");
 400                           break;
 401                         case 0x80:
 402                           func (stream, "d");
 403                           break;
 404                         case 0x00080000:
 405                           func (stream, "e");
 406                           break;
 407                         default:
 408                           func (stream, _("<illegal precision>"));
 409                           break;
 410                         }
 411                       break;
 412                     case 'Q':
 413                       switch (given & 0x00408000)
 414                         {
 415                         case 0:
 416                           func (stream, "s");
 417                           break;
 418                         case 0x8000:
 419                           func (stream, "d");
 420                           break;
 421                         case 0x00400000:
 422                           func (stream, "e");
 423                           break;
 424                         default:
 425                           func (stream, "p");
 426                           break;
 427                         }
 428                       break;
 429                     case 'R':
 430                       switch (given & 0x60)
 431                         {
 432                         case 0:
 433                           break;
 434                         case 0x20:
 435                           func (stream, "p");
 436                           break;
 437                         case 0x40:
 438                           func (stream, "m");
 439                           break;
 440                         default:
 441                           func (stream, "z");
 442                           break;
 443                         }
 444                       break;
 445
 446                     case '0': case '1': case '2': case '3': case '4':
 447                     case '5': case '6': case '7': case '8': case '9':
 448                       {
 449                         int bitstart = *c++ - '0';
 450                         int bitend = 0;
 451                         while (*c >= '0' && *c <= '9')
 452                           bitstart = (bitstart * 10) + *c++ - '0';
 453
 454                         switch (*c)
 455                           {
 456                           case '-':
 457                             c++;
 458                             while (*c >= '0' && *c <= '9')
 459                               bitend = (bitend * 10) + *c++ - '0';
 460                             if (!bitend)
 461                               abort ();
 462                             switch (*c)
 463                               {
 464                               case 'r':
 465                                 {
 466                                   long reg;
 467                                   reg = given >> bitstart;
 468                                   reg &= (2 << (bitend - bitstart)) - 1;
 469                                   func (stream, "%s", arm_regnames[reg]);
 470                                 }
 471                                 break;
 472                               case 'd':
 473                                 {
 474                                   long reg;
 475                                   reg = given >> bitstart;
 476                                   reg &= (2 << (bitend - bitstart)) - 1;
 477                                   func (stream, "%d", reg);
 478                                 }
 479                                 break;
 480                               case 'x':
 481                                 {
 482                                   long reg;
 483                                   reg = given >> bitstart;
 484                                   reg &= (2 << (bitend - bitstart)) - 1;
 485                                   func (stream, "0x%08x", reg);
 486
 487                                   /* Some SWI instructions have special meanings.  */
 488                                   if ((given & 0x0fffffff) == 0x0FF00000)
 489                                     func (stream, "\t; IMB");
 490                                   else if ((given & 0x0fffffff) == 0x0FF00001)
 491                                     func (stream, "\t; IMBRange");
 492                                 }
 493                                 break;
 494                               case 'f':
 495                                 {
 496                                   long reg;
 497                                   reg = given >> bitstart;
 498                                   reg &= (2 << (bitend - bitstart)) - 1;
 499                                   if (reg > 7)
 500                                     func (stream, "#%s",
 501                                           arm_fp_const[reg & 7]);
 502                                   else
 503                                     func (stream, "f%d", reg);
 504                                 }
 505                                 break;
 506                               default:
 507                                 abort ();
 508                               }
 509                             break;
 510                           case '`':
 511                             c++;
 512                             if ((given & (1 << bitstart)) == 0)
 513                               func (stream, "%c", *c);
 514                             break;
 515                           case '\'':
 516                             c++;
 517                             if ((given & (1 << bitstart)) != 0)
 518                               func (stream, "%c", *c);
 519                             break;
 520                           case '?':
 521                             ++c;
 522                             if ((given & (1 << bitstart)) != 0)
 523                               func (stream, "%c", *c++);
 524                             else
 525                               func (stream, "%c", *++c);
 526                             break;
 527                           default:
 528                             abort ();
 529                           }
 530                         break;
 531
 532                       default:
 533                         abort ();
 534                       }
 535                     }
 536                 }
 537               else
 538                 func (stream, "%c", *c);
 539             }
 540           return 4;
 541         }
 542     }
 543   abort ();
 544 }
 545
 546 /* Print one instruction from PC on INFO->STREAM.
 547    Return the size of the instruction. */
 548
 549 static int
 550 print_insn_thumb (pc, info, given)
 551      bfd_vma                   pc;
 552      struct disassemble_info * info;
 553      long                      given;
 554 {
 555   struct thumb_opcode * insn;
 556   void *                stream = info->stream;
 557   fprintf_ftype         func = info->fprintf_func;
 558
 559   for (insn = thumb_opcodes; insn->assembler; insn++)
 560     {
 561       if ((given & insn->mask) == insn->value)
 562         {
 563           char * c = insn->assembler;
 564
 565           /* Special processing for Thumb 2 instruction BL sequence: */
 566           if (!*c) /* check for empty (not NULL) assembler string */
 567             {
 568               info->bytes_per_chunk = 4;
 569               info->bytes_per_line  = 4;
 570
 571               func (stream, "%04x\tbl\t", given & 0xffff);
 572               (*info->print_address_func)
 573                 (BDISP23 (given) * 2 + pc + 4, info);
 574               return 4;
 575             }
 576           else
 577             {
 578               info->bytes_per_chunk = 2;
 579               info->bytes_per_line  = 4;
 580
 581               given &= 0xffff;
 582               func (stream, "%04x\t", given);
 583
 584               for (; *c; c++)
 585                 {
 586                   if (*c == '%')
 587                     {
 588                       int domaskpc = 0;
 589                       int domasklr = 0;
 590
 591                       switch (*++c)
 592                         {
 593                         case '%':
 594                           func (stream, "%%");
 595                           break;
 596
 597                         case 'S':
 598                           {
 599                             long reg;
 600                             reg = (given >> 3) & 0x7;
 601                             if (given & (1 << 6))
 602                               reg += 8;
 603                             func (stream, "%s", arm_regnames[reg]);
 604                           }
 605                           break;
 606
 607                         case 'D':
 608                           {
 609                             long reg;
 610
 611                             reg = given & 0x7;
 612                             if (given & (1 << 7))
 613                              reg += 8;
 614                             func (stream, "%s", arm_regnames[reg]);
 615                           }
 616                           break;
 617
 618                         case 'T':
 619                           func (stream, "%s",
 620                                 arm_conditional [(given >> 8) & 0xf]);
 621                           break;
 622
 623                         case 'N':
 624                           if (given & (1 << 8))
 625                             domasklr = 1;
 626                           /* fall through */
 627                         case 'O':
 628                           if (*c == 'O' && (given & (1 << 8)))
 629                             domaskpc = 1;
 630                           /* fall through */
 631                         case 'M':
 632                           {
 633                             int started = 0;
 634                             int reg;
 635
 636                             func (stream, "{");
 637                             /* It would be nice if we could spot
 638                                ranges, and generate the rS-rE format: */
 639                             for (reg = 0; (reg < 8); reg++)
 640                               if ((given & (1 << reg)) != 0)
 641                                 {
 642                                   if (started)
 643                                     func (stream, ", ");
 644                                   started = 1;
 645                                   func (stream, "%s", arm_regnames[reg]);
 646                                 }
 647
 648                             if (domasklr)
 649                               {
 650                                 if (started)
 651                                   func (stream, ", ");
 652                                 started = 1;
 653                                 func (stream, "lr");
 654                               }
 655
 656                             if (domaskpc)
 657                               {
 658                                 if (started)
 659                                   func (stream, ", ");
 660                                 func (stream, "pc");
 661                               }
 662
 663                             func (stream, "}");
 664                           }
 665                           break;
 666
 667
 668                         case '0': case '1': case '2': case '3': case '4':
 669                         case '5': case '6': case '7': case '8': case '9':
 670                           {
 671                             int bitstart = *c++ - '0';
 672                             int bitend = 0;
 673
 674                             while (*c >= '0' && *c <= '9')
 675                               bitstart = (bitstart * 10) + *c++ - '0';
 676
 677                             switch (*c)
 678                               {
 679                               case '-':
 680                                 {
 681                                   long reg;
 682
 683                                   c++;
 684                                   while (*c >= '0' && *c <= '9')
 685                                     bitend = (bitend * 10) + *c++ - '0';
 686                                   if (!bitend)
 687                                     abort ();
 688                                   reg = given >> bitstart;
 689                                   reg &= (2 << (bitend - bitstart)) - 1;
 690                                   switch (*c)
 691                                     {
 692                                     case 'r':
 693                                       func (stream, "%s", arm_regnames[reg]);
 694                                       break;
 695
 696                                     case 'd':
 697                                       func (stream, "%d", reg);
 698                                       break;
 699
 700                                     case 'H':
 701                                       func (stream, "%d", reg << 1);
 702                                       break;
 703
 704                                     case 'W':
 705                                       func (stream, "%d", reg << 2);
 706                                       break;
 707
 708                                     case 'a':
 709                                       /* PC-relative address -- the bottom two
 710                                          bits of the address are dropped before
 711                                          the calculation.  */
 712                                       info->print_address_func
 713                                         (((pc + 4) & ~3) + (reg << 2), info);
 714                                       break;
 715
 716                                     case 'x':
 717                                       func (stream, "0x%04x", reg);
 718                                       break;
 719
 720                                     case 'I':
 721                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 722                                       func (stream, "%d", reg);
 723                                       break;
 724
 725                                     case 'B':
 726                                       reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 727                                       (*info->print_address_func)
 728                                         (reg * 2 + pc + 4, info);
 729                                       break;
 730
 731                                     default:
 732                                       abort ();
 733                                     }
 734                                 }
 735                                 break;
 736
 737                               case '\'':
 738                                 c++;
 739                                 if ((given & (1 << bitstart)) != 0)
 740                                   func (stream, "%c", *c);
 741                                 break;
 742
 743                               case '?':
 744                                 ++c;
 745                                 if ((given & (1 << bitstart)) != 0)
 746                                   func (stream, "%c", *c++);
 747                                 else
 748                                   func (stream, "%c", *++c);
 749                                 break;
 750
 751                               default:
 752                                  abort ();
 753                               }
 754                           }
 755                           break;
 756
 757                         default:
 758                           abort ();
 759                         }
 760                     }
 761                   else
 762                     func (stream, "%c", *c);
 763                 }
 764              }
 765           return 2;
 766        }
 767     }
 768
 769   /* no match */
 770   abort ();
 771 }
 772
 773 /* Select a different register name set.
 774    Returns true if the name set selected is the APCS name set.  */
 775 int
 776 arm_toggle_regnames ()
 777 {
 778   if (arm_regnames == arm_regnames_standard)
 779     arm_regnames = arm_regnames_apcs;
 780   else
 781     arm_regnames = arm_regnames_standard;
 782
 783   return arm_regnames == arm_regnames_apcs;
 784 }
 785
 786 static void
 787 parse_disassembler_options (options)
 788      char * options;
 789 {
 790   if (options == NULL)
 791     return;
 792
 793   if (strncmp (options, "reg-names-", 10) == 0)
 794     {
 795       options += 10;
 796
 797       if (strcmp (options, "std") == 0)
 798         arm_regnames = arm_regnames_standard;
 799       else if (strcmp (options, "apcs") == 0)
 800         arm_regnames = arm_regnames_apcs;
 801       else if (strcmp (options, "raw") == 0)
 802         arm_regnames = arm_regnames_raw;
 803       else
 804         fprintf (stderr, "Unrecognised register name set: %s\n", options);
 805     }
 806   else
 807     fprintf (stderr, "Unrecognised disassembler option: %s\n", options);
 808
 809   return;
 810 }
 811
 812 /* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
 813
 814 int
 815 print_insn_big_arm (pc, info)
 816      bfd_vma pc;
 817      struct disassemble_info * info;
 818 {
 819   unsigned char      b[4];
 820   long               given;
 821   int                status;
 822   coff_symbol_type * cs;
 823   elf_symbol_type *  es;
 824   int                is_thumb;
 825
 826   if (info->disassembler_options)
 827     {
 828       parse_disassembler_options (info->disassembler_options);
 829
 830       /* To avoid repeated parsing of this option, we remove it here.  */
 831       info->disassembler_options = NULL;
 832     }
 833
 834   is_thumb = false;
 835   if (info->symbols != NULL)
 836     {
 837       if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 838         {
 839           cs = coffsymbol (*info->symbols);
 840           is_thumb = (   cs->native->u.syment.n_sclass == C_THUMBEXT
 841                       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 842                       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 843                       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 844                       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 845         }
 846       else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 847         {
 848           es = *(elf_symbol_type **)(info->symbols);
 849           is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 850             STT_ARM_TFUNC;
 851         }
 852     }
 853
 854   info->bytes_per_chunk = 4;
 855   info->display_endian = BFD_ENDIAN_BIG;
 856
 857   /* Always fetch word aligned values.  */
 858
 859   status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
 860   if (status != 0)
 861     {
 862       (*info->memory_error_func) (status, pc, info);
 863       return -1;
 864     }
 865
 866   if (is_thumb)
 867     {
 868       if (pc & 0x2)
 869         {
 870           given = (b[2] << 8) | b[3];
 871
 872           status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
 873           if (status != 0)
 874             {
 875               info->memory_error_func (status, pc + 4, info);
 876               return -1;
 877             }
 878
 879           given |= (b[0] << 24) | (b[1] << 16);
 880         }
 881       else
 882         given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
 883     }
 884   else
 885     given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 886
 887   if (is_thumb)
 888     status = print_insn_thumb (pc, info, given);
 889   else
 890     status = print_insn_arm (pc, info, given);
 891
 892   return status;
 893 }
 894
 895 int
 896 print_insn_little_arm (pc, info)
 897      bfd_vma pc;
 898      struct disassemble_info * info;
 899 {
 900   unsigned char      b[4];
 901   long               given;
 902   int                status;
 903   coff_symbol_type * cs;
 904   elf_symbol_type *  es;
 905   int                is_thumb;
 906
 907   if (info->disassembler_options)
 908     {
 909       parse_disassembler_options (info->disassembler_options);
 910
 911       /* To avoid repeated parsing of this option, we remove it here.  */
 912       info->disassembler_options = NULL;
 913     }
 914
 915   is_thumb = false;
 916
 917   if (info->symbols != NULL)
 918     {
 919       if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
 920         {
 921           cs = coffsymbol (*info->symbols);
 922           is_thumb = (   cs->native->u.syment.n_sclass == C_THUMBEXT
 923                       || cs->native->u.syment.n_sclass == C_THUMBSTAT
 924                       || cs->native->u.syment.n_sclass == C_THUMBLABEL
 925                       || cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
 926                       || cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
 927         }
 928       else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
 929         {
 930           es = *(elf_symbol_type **)(info->symbols);
 931           is_thumb = ELF_ST_TYPE (es->internal_elf_sym.st_info) ==
 932             STT_ARM_TFUNC;
 933         }
 934     }
 935
 936   info->bytes_per_chunk = 4;
 937   info->display_endian = BFD_ENDIAN_LITTLE;
 938
 939   status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
 940   if (status != 0 && is_thumb)
 941     {
 942       info->bytes_per_chunk = 2;
 943
 944       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 945       b[3] = b[2] = 0;
 946     }
 947   if (status != 0)
 948     {
 949       (*info->memory_error_func) (status, pc, info);
 950       return -1;
 951     }
 952
 953   given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 954
 955   if (is_thumb)
 956     status = print_insn_thumb (pc, info, given);
 957   else
 958     status = print_insn_arm (pc, info, given);
 959
 960   return status;
 961 }