opcodes/tic4x-dis.c

   1 /* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils.
   2
   3    Copyright (C) 2002-2024 Free Software Foundation, Inc.
   4
   5    Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
   6
   7    This file is part of the GNU opcodes library.
   8
   9    This library is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3, or (at your option)
  12    any later version.
  13
  14    It is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 #include "sysdep.h"
  25 #include <math.h>
  26 #include "libiberty.h"
  27 #include "disassemble.h"
  28 #include "opcode/tic4x.h"
  29
  30 #define TIC4X_DEBUG 0
  31
  32 #define TIC4X_HASH_SIZE   11   /* 11 (bits) and above should give unique entries.  */
  33 #define TIC4X_SPESOP_SIZE 8    /* Max 8. ops for special instructions.  */
  34
  35 typedef enum
  36 {
  37   IMMED_SINT,
  38   IMMED_SUINT,
  39   IMMED_SFLOAT,
  40   IMMED_INT,
  41   IMMED_UINT,
  42   IMMED_FLOAT
  43 }
  44 immed_t;
  45
  46 typedef enum
  47 {
  48   INDIRECT_SHORT,
  49   INDIRECT_LONG,
  50   INDIRECT_TIC4X
  51 }
  52 indirect_t;
  53
  54 static unsigned long tic4x_version = 0;
  55 static unsigned int tic4x_dp = 0;
  56 static tic4x_inst_t **optab = NULL;
  57 static tic4x_inst_t **optab_special = NULL;
  58 static const char *registernames[REG_TABLE_SIZE];
  59
  60 static int
  61 tic4x_pc_offset (unsigned int op)
  62 {
  63   /* Determine the PC offset for a C[34]x instruction.
  64      This could be simplified using some boolean algebra
  65      but at the expense of readability.  */
  66   switch (op >> 24)
  67     {
  68     case 0x60:  /* br */
  69     case 0x62:  /* call  (C4x) */
  70     case 0x64:  /* rptb  (C4x) */
  71       return 1;
  72     case 0x61:  /* brd */
  73     case 0x63:  /* laj */
  74     case 0x65:  /* rptbd (C4x) */
  75       return 3;
  76     case 0x66:  /* swi */
  77     case 0x67:
  78       return 0;
  79     default:
  80       break;
  81     }
  82
  83   switch ((op & 0xffe00000) >> 20)
  84     {
  85     case 0x6a0: /* bB */
  86     case 0x720: /* callB */
  87     case 0x740: /* trapB */
  88       return 1;
  89
  90     case 0x6a2: /* bBd */
  91     case 0x6a6: /* bBat */
  92     case 0x6aa: /* bBaf */
  93     case 0x722: /* lajB */
  94     case 0x748: /* latB */
  95     case 0x798: /* rptbd */
  96       return 3;
  97
  98     default:
  99       break;
 100     }
 101
 102   switch ((op & 0xfe200000) >> 20)
 103     {
 104     case 0x6e0: /* dbB */
 105       return 1;
 106
 107     case 0x6e2: /* dbBd */
 108       return 3;
 109
 110     default:
 111       break;
 112     }
 113
 114   return 0;
 115 }
 116
 117 static int
 118 tic4x_print_char (struct disassemble_info * info, char ch)
 119 {
 120   if (info != NULL)
 121     (*info->fprintf_func) (info->stream, "%c", ch);
 122   return 1;
 123 }
 124
 125 static int
 126 tic4x_print_str (struct disassemble_info *info, const char *str)
 127 {
 128   if (info != NULL)
 129     (*info->fprintf_func) (info->stream, "%s", str);
 130   return 1;
 131 }
 132
 133 static int
 134 tic4x_print_register (struct disassemble_info *info, unsigned long regno)
 135 {
 136   unsigned int i;
 137
 138   if (registernames[REG_R0] == NULL)
 139     {
 140       for (i = 0; i < tic3x_num_registers; i++)
 141         registernames[tic3x_registers[i].regno] = tic3x_registers[i].name;
 142       if (IS_CPU_TIC4X (tic4x_version))
 143         {
 144           /* Add C4x additional registers, overwriting
 145              any C3x registers if necessary.  */
 146           for (i = 0; i < tic4x_num_registers; i++)
 147             registernames[tic4x_registers[i].regno] = tic4x_registers[i].name;
 148         }
 149     }
 150   if (regno > (IS_CPU_TIC4X (tic4x_version) ? TIC4X_REG_MAX : TIC3X_REG_MAX))
 151     return 0;
 152   if (info != NULL)
 153     (*info->fprintf_func) (info->stream, "%s", registernames[regno]);
 154   return 1;
 155 }
 156
 157 static int
 158 tic4x_print_addr (struct disassemble_info *info, unsigned long addr)
 159 {
 160   if (info != NULL)
 161     (*info->print_address_func)(addr, info);
 162   return 1;
 163 }
 164
 165 static int
 166 tic4x_print_relative (struct disassemble_info *info,
 167                       unsigned long pc,
 168                       long offset,
 169                       unsigned long opcode)
 170 {
 171   return tic4x_print_addr (info, pc + offset + tic4x_pc_offset (opcode));
 172 }
 173
 174 static int
 175 tic4x_print_direct (struct disassemble_info *info, unsigned long arg)
 176 {
 177   if (info != NULL)
 178     {
 179       (*info->fprintf_func) (info->stream, "@");
 180       tic4x_print_addr (info, arg + (tic4x_dp << 16));
 181     }
 182   return 1;
 183 }
 184 #if 0
 185 /* FIXME: make the floating point stuff not rely on host
 186    floating point arithmetic.  */
 187
 188 static void
 189 tic4x_print_ftoa (unsigned int val, FILE *stream, fprintf_ftype pfunc)
 190 {
 191   int e;
 192   int s;
 193   int f;
 194   double num = 0.0;
 195
 196   e = EXTRS (val, 31, 24);      /* Exponent.  */
 197   if (e != -128)
 198     {
 199       s = EXTRU (val, 23, 23);  /* Sign bit.  */
 200       f = EXTRU (val, 22, 0);   /* Mantissa.  */
 201       if (s)
 202         f += -2 * (1 << 23);
 203       else
 204         f += (1 << 23);
 205       num = f / (double)(1 << 23);
 206       num = ldexp (num, e);
 207     }
 208   (*pfunc)(stream, "%.9g", num);
 209 }
 210 #endif
 211
 212 static int
 213 tic4x_print_immed (struct disassemble_info *info,
 214                    immed_t type,
 215                    unsigned long arg)
 216 {
 217   int s;
 218   int f;
 219   int e;
 220   double num = 0.0;
 221
 222   if (info == NULL)
 223     return 1;
 224   switch (type)
 225     {
 226     case IMMED_SINT:
 227     case IMMED_INT:
 228       (*info->fprintf_func) (info->stream, "%ld", (long) arg);
 229       break;
 230
 231     case IMMED_SUINT:
 232     case IMMED_UINT:
 233       (*info->fprintf_func) (info->stream, "%lu", arg);
 234       break;
 235
 236     case IMMED_SFLOAT:
 237       e = EXTRS (arg, 15, 12);
 238       if (e != -8)
 239         {
 240           s = EXTRU (arg, 11, 11);
 241           f = EXTRU (arg, 10, 0);
 242           if (s)
 243             f += -2 * (1 << 11);
 244           else
 245             f += (1 << 11);
 246           num = f / (double)(1 << 11);
 247           num = ldexp (num, e);
 248         }
 249       (*info->fprintf_func) (info->stream, "%f", num);
 250       break;
 251     case IMMED_FLOAT:
 252       e = EXTRS (arg, 31, 24);
 253       if (e != -128)
 254         {
 255           s = EXTRU (arg, 23, 23);
 256           f = EXTRU (arg, 22, 0);
 257           if (s)
 258             f += -2 * (1 << 23);
 259           else
 260             f += (1 << 23);
 261           num = f / (double)(1 << 23);
 262           num = ldexp (num, e);
 263         }
 264       (*info->fprintf_func) (info->stream, "%f", num);
 265       break;
 266     }
 267   return 1;
 268 }
 269
 270 static int
 271 tic4x_print_cond (struct disassemble_info *info, unsigned int cond)
 272 {
 273   static tic4x_cond_t **condtable = NULL;
 274   unsigned int i;
 275
 276   if (condtable == NULL)
 277     {
 278       condtable = xcalloc (32, sizeof (tic4x_cond_t *));
 279       for (i = 0; i < tic4x_num_conds; i++)
 280         condtable[tic4x_conds[i].cond] = (tic4x_cond_t *)(tic4x_conds + i);
 281     }
 282   if (cond > 31 || condtable[cond] == NULL)
 283     return 0;
 284   if (info != NULL)
 285     (*info->fprintf_func) (info->stream, "%s", condtable[cond]->name);
 286   return 1;
 287 }
 288
 289 static int
 290 tic4x_print_indirect (struct disassemble_info *info,
 291                       indirect_t type,
 292                       unsigned long arg)
 293 {
 294   unsigned int aregno;
 295   unsigned int modn;
 296   unsigned int disp;
 297   const char *a;
 298
 299   aregno = 0;
 300   modn = 0;
 301   disp = 1;
 302   switch(type)
 303     {
 304     case INDIRECT_TIC4X:                /* *+ARn(disp) */
 305       disp = EXTRU (arg, 7, 3);
 306       aregno = EXTRU (arg, 2, 0) + REG_AR0;
 307       modn = 0;
 308       break;
 309     case INDIRECT_SHORT:
 310       disp = 1;
 311       aregno = EXTRU (arg, 2, 0) + REG_AR0;
 312       modn = EXTRU (arg, 7, 3);
 313       break;
 314     case INDIRECT_LONG:
 315       disp = EXTRU (arg, 7, 0);
 316       aregno = EXTRU (arg, 10, 8) + REG_AR0;
 317       modn = EXTRU (arg, 15, 11);
 318       if (modn > 7 && disp != 0)
 319         return 0;
 320       break;
 321     default:
 322         (*info->fprintf_func)(info->stream, "# internal error: Unknown indirect type %d", type);
 323         return 0;
 324     }
 325   if (modn > TIC3X_MODN_MAX)
 326     return 0;
 327   a = tic4x_indirects[modn].name;
 328   while (*a)
 329     {
 330       switch (*a)
 331         {
 332         case 'a':
 333           tic4x_print_register (info, aregno);
 334           break;
 335         case 'd':
 336           tic4x_print_immed (info, IMMED_UINT, disp);
 337           break;
 338         case 'y':
 339           tic4x_print_str (info, "ir0");
 340           break;
 341         case 'z':
 342           tic4x_print_str (info, "ir1");
 343           break;
 344         default:
 345           tic4x_print_char (info, *a);
 346           break;
 347         }
 348       a++;
 349     }
 350   return 1;
 351 }
 352
 353 static int
 354 tic4x_print_op (struct disassemble_info *info,
 355                 unsigned long instruction,
 356                 tic4x_inst_t *p,
 357                 unsigned long pc)
 358 {
 359   int val;
 360   const char *s;
 361   const char *parallel = NULL;
 362
 363   /* Print instruction name.  */
 364   s = p->name;
 365   while (*s && parallel == NULL)
 366     {
 367       switch (*s)
 368         {
 369         case 'B':
 370           if (! tic4x_print_cond (info, EXTRU (instruction, 20, 16)))
 371             return 0;
 372           break;
 373         case 'C':
 374           if (! tic4x_print_cond (info, EXTRU (instruction, 27, 23)))
 375             return 0;
 376           break;
 377         case '_':
 378           parallel = s + 1;     /* Skip past `_' in name.  */
 379           break;
 380         default:
 381           tic4x_print_char (info, *s);
 382           break;
 383         }
 384       s++;
 385     }
 386
 387   /* Print arguments.  */
 388   s = p->args;
 389   if (*s)
 390     tic4x_print_char (info, ' ');
 391
 392   while (*s)
 393     {
 394       switch (*s)
 395         {
 396         case '*': /* Indirect 0--15.  */
 397           if (! tic4x_print_indirect (info, INDIRECT_LONG,
 398                                       EXTRU (instruction, 15, 0)))
 399             return 0;
 400           break;
 401
 402         case '#': /* Only used for ldp, ldpk.  */
 403           tic4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0));
 404           break;
 405
 406         case '@': /* Direct 0--15.  */
 407           tic4x_print_direct (info, EXTRU (instruction, 15, 0));
 408           break;
 409
 410         case 'A': /* Address register 24--22.  */
 411           if (! tic4x_print_register (info, EXTRU (instruction, 24, 22) +
 412                                       REG_AR0))
 413             return 0;
 414           break;
 415
 416         case 'B': /* 24-bit unsigned int immediate br(d)/call/rptb
 417                      address 0--23.  */
 418           if (IS_CPU_TIC4X (tic4x_version))
 419             tic4x_print_relative (info, pc, EXTRS (instruction, 23, 0),
 420                                   p->opcode);
 421           else
 422             tic4x_print_addr (info, EXTRU (instruction, 23, 0));
 423           break;
 424
 425         case 'C': /* Indirect (short C4x) 0--7.  */
 426           if (! IS_CPU_TIC4X (tic4x_version))
 427             return 0;
 428           if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
 429                                       EXTRU (instruction, 7, 0)))
 430             return 0;
 431           break;
 432
 433         case 'D':
 434           /* Cockup if get here...  */
 435           break;
 436
 437         case 'E': /* Register 0--7.  */
 438         case 'e':
 439           if (! tic4x_print_register (info, EXTRU (instruction, 7, 0)))
 440             return 0;
 441           break;
 442
 443         case 'F': /* 16-bit float immediate 0--15.  */
 444           tic4x_print_immed (info, IMMED_SFLOAT,
 445                              EXTRU (instruction, 15, 0));
 446           break;
 447
 448         case 'i': /* Extended indirect 0--7.  */
 449           if (EXTRU (instruction, 7, 5) == 7)
 450             {
 451               if (!tic4x_print_register (info, EXTRU (instruction, 4, 0)))
 452                 return 0;
 453               break;
 454             }
 455           /* Fallthrough */
 456
 457         case 'I': /* Indirect (short) 0--7.  */
 458           if (! tic4x_print_indirect (info, INDIRECT_SHORT,
 459                                       EXTRU (instruction, 7, 0)))
 460             return 0;
 461           break;
 462
 463         case 'j': /* Extended indirect 8--15 */
 464           if (EXTRU (instruction, 15, 13) == 7)
 465             {
 466               if (! tic4x_print_register (info, EXTRU (instruction, 12, 8)))
 467                 return 0;
 468               break;
 469             }
 470           /* Fall through.  */
 471
 472         case 'J': /* Indirect (short) 8--15.  */
 473           if (! tic4x_print_indirect (info, INDIRECT_SHORT,
 474                                       EXTRU (instruction, 15, 8)))
 475             return 0;
 476           break;
 477
 478         case 'G': /* Register 8--15.  */
 479         case 'g':
 480           if (! tic4x_print_register (info, EXTRU (instruction, 15, 8)))
 481             return 0;
 482           break;
 483
 484         case 'H': /* Register 16--18.  */
 485           if (! tic4x_print_register (info, EXTRU (instruction, 18, 16)))
 486             return 0;
 487           break;
 488
 489         case 'K': /* Register 19--21.  */
 490           if (! tic4x_print_register (info, EXTRU (instruction, 21, 19)))
 491             return 0;
 492           break;
 493
 494         case 'L': /* Register 22--24.  */
 495           if (! tic4x_print_register (info, EXTRU (instruction, 24, 22)))
 496             return 0;
 497           break;
 498
 499         case 'M': /* Register 22--22.  */
 500           tic4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2);
 501           break;
 502
 503         case 'N': /* Register 23--23.  */
 504           tic4x_print_register (info, EXTRU (instruction, 23, 23) + REG_R0);
 505           break;
 506
 507         case 'O': /* Indirect (short C4x) 8--15.  */
 508           if (! IS_CPU_TIC4X (tic4x_version))
 509             return 0;
 510           if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
 511                                       EXTRU (instruction, 15, 8)))
 512             return 0;
 513           break;
 514
 515         case 'P': /* Displacement 0--15 (used by Bcond and BcondD).  */
 516           tic4x_print_relative (info, pc, EXTRS (instruction, 15, 0),
 517                                 p->opcode);
 518           break;
 519
 520         case 'Q': /* Register 0--15.  */
 521         case 'q':
 522           if (! tic4x_print_register (info, EXTRU (instruction, 15, 0)))
 523             return 0;
 524           break;
 525
 526         case 'R': /* Register 16--20.  */
 527         case 'r':
 528           if (! tic4x_print_register (info, EXTRU (instruction, 20, 16)))
 529             return 0;
 530           break;
 531
 532         case 'S': /* 16-bit signed immediate 0--15.  */
 533           tic4x_print_immed (info, IMMED_SINT,
 534                              EXTRS (instruction, 15, 0));
 535           break;
 536
 537         case 'T': /* 5-bit signed immediate 16--20  (C4x stik).  */
 538           if (! IS_CPU_TIC4X (tic4x_version))
 539             return 0;
 540           if (! tic4x_print_immed (info, IMMED_SUINT,
 541                                    EXTRU (instruction, 20, 16)))
 542             return 0;
 543           break;
 544
 545         case 'U': /* 16-bit unsigned int immediate 0--15.  */
 546           tic4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0));
 547           break;
 548
 549         case 'V': /* 5/9-bit unsigned vector 0--4/8.  */
 550           tic4x_print_immed (info, IMMED_SUINT,
 551                              IS_CPU_TIC4X (tic4x_version) ?
 552                              EXTRU (instruction, 8, 0) :
 553                              EXTRU (instruction, 4, 0) & ~0x20);
 554           break;
 555
 556         case 'W': /* 8-bit signed immediate 0--7.  */
 557           if (! IS_CPU_TIC4X (tic4x_version))
 558             return 0;
 559           tic4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 7, 0));
 560           break;
 561
 562         case 'X': /* Expansion register 4--0.  */
 563           val = EXTRU (instruction, 4, 0) + REG_IVTP;
 564           if (val < REG_IVTP || val > REG_TVTP)
 565             return 0;
 566           if (! tic4x_print_register (info, val))
 567             return 0;
 568           break;
 569
 570         case 'Y': /* Address register 16--20.  */
 571           val = EXTRU (instruction, 20, 16);
 572           if (val < REG_AR0 || val > REG_SP)
 573             return 0;
 574           if (! tic4x_print_register (info, val))
 575             return 0;
 576           break;
 577
 578         case 'Z': /* Expansion register 16--20.  */
 579           val = EXTRU (instruction, 20, 16) + REG_IVTP;
 580           if (val < REG_IVTP || val > REG_TVTP)
 581             return 0;
 582           if (! tic4x_print_register (info, val))
 583             return 0;
 584           break;
 585
 586         case '|':       /* Parallel instruction.  */
 587           tic4x_print_str (info, " || ");
 588           tic4x_print_str (info, parallel);
 589           tic4x_print_char (info, ' ');
 590           break;
 591
 592         case ';':
 593           tic4x_print_char (info, ',');
 594           break;
 595
 596         default:
 597           tic4x_print_char (info, *s);
 598           break;
 599         }
 600       s++;
 601     }
 602   return 1;
 603 }
 604
 605 static void
 606 tic4x_hash_opcode_special (tic4x_inst_t **optable_special,
 607                            const tic4x_inst_t *inst)
 608 {
 609   int i;
 610
 611   for (i = 0;i < TIC4X_SPESOP_SIZE; i++)
 612     if (optable_special[i] != NULL
 613         && optable_special[i]->opcode == inst->opcode)
 614       {
 615         /* Collision (we have it already) - overwrite.  */
 616         optable_special[i] = (tic4x_inst_t *) inst;
 617         return;
 618       }
 619
 620   for (i = 0; i < TIC4X_SPESOP_SIZE; i++)
 621     if (optable_special[i] == NULL)
 622       {
 623         /* Add the new opcode.  */
 624         optable_special[i] = (tic4x_inst_t *) inst;
 625         return;
 626       }
 627
 628   /* This should never occur. This happens if the number of special
 629      instructions exceeds TIC4X_SPESOP_SIZE. Please increase the variable
 630      of this variable */
 631 #if TIC4X_DEBUG
 632   printf ("optable_special[] is full, please increase TIC4X_SPESOP_SIZE!\n");
 633 #endif
 634 }
 635
 636 static void
 637 tic4x_hash_opcode (tic4x_inst_t **optable,
 638                    tic4x_inst_t **optable_special,
 639                    const tic4x_inst_t *inst,
 640                    const unsigned long tic4x_oplevel)
 641 {
 642   unsigned int j;
 643   unsigned int opcode = inst->opcode >> (32 - TIC4X_HASH_SIZE);
 644   unsigned int opmask = inst->opmask >> (32 - TIC4X_HASH_SIZE);
 645
 646   /* Use a TIC4X_HASH_SIZE bit index as a hash index.  We should
 647      have unique entries so there's no point having a linked list
 648      for each entry?  */
 649   for (j = opcode; j < opmask; j++)
 650     if ((j & opmask) == opcode
 651          && inst->oplevel & tic4x_oplevel)
 652       {
 653 #if TIC4X_DEBUG
 654         /* We should only have collisions for synonyms like
 655            ldp for ldi.  */
 656         if (optable[j] != NULL)
 657           printf ("Collision at index %d, %s and %s\n",
 658                   j, optable[j]->name, inst->name);
 659 #endif
 660         /* Catch those ops that collide with others already inside the
 661            hash, and have a opmask greater than the one we use in the
 662            hash. Store them in a special-list, that will handle full
 663            32-bit INSN, not only the first 11-bit (or so). */
 664         if (optable[j] != NULL
 665             && inst->opmask & ~(opmask << (32 - TIC4X_HASH_SIZE)))
 666           {
 667             /* Add the instruction already on the list.  */
 668             tic4x_hash_opcode_special (optable_special, optable[j]);
 669
 670             /* Add the new instruction.  */
 671             tic4x_hash_opcode_special (optable_special, inst);
 672           }
 673
 674         optable[j] = (tic4x_inst_t *) inst;
 675       }
 676 }
 677
 678 /* Disassemble the instruction in 'instruction'.
 679    'pc' should be the address of this instruction, it will
 680    be used to print the target address if this is a relative jump or call
 681    the disassembled instruction is written to 'info'.
 682    The function returns the length of this instruction in words.  */
 683
 684 static int
 685 tic4x_disassemble (unsigned long pc,
 686                    unsigned long instruction,
 687                    struct disassemble_info *info)
 688 {
 689   tic4x_inst_t *p;
 690   int i;
 691   unsigned long tic4x_oplevel;
 692
 693   if (tic4x_version != info->mach)
 694     {
 695       tic4x_version = info->mach;
 696       /* Don't stash anything from a previous call using a different
 697          machine.  */
 698       free (optab);
 699       optab = NULL;
 700       free (optab_special);
 701       optab_special = NULL;
 702       registernames[REG_R0] = NULL;
 703     }
 704
 705   tic4x_oplevel  = (IS_CPU_TIC4X (tic4x_version)) ? OP_C4X : 0;
 706   tic4x_oplevel |= OP_C3X | OP_LPWR | OP_IDLE2 | OP_ENH;
 707
 708   if (optab == NULL)
 709     {
 710       optab = xcalloc ((1 << TIC4X_HASH_SIZE), sizeof (tic4x_inst_t *));
 711
 712       optab_special = xcalloc (TIC4X_SPESOP_SIZE, sizeof (tic4x_inst_t *));
 713
 714       /* Install opcodes in reverse order so that preferred
 715          forms overwrite synonyms.  */
 716       for (i = tic4x_num_insts - 1; i >= 0; i--)
 717         tic4x_hash_opcode (optab, optab_special, &tic4x_insts[i],
 718                            tic4x_oplevel);
 719
 720       /* We now need to remove the insn that are special from the
 721          "normal" optable, to make the disasm search this extra list
 722          for them.  */
 723       for (i = 0; i < TIC4X_SPESOP_SIZE; i++)
 724         if (optab_special[i] != NULL)
 725           optab[optab_special[i]->opcode >> (32 - TIC4X_HASH_SIZE)] = NULL;
 726     }
 727
 728   /* See if we can pick up any loading of the DP register...  */
 729   if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70)
 730     tic4x_dp = EXTRU (instruction, 15, 0);
 731
 732   p = optab[instruction >> (32 - TIC4X_HASH_SIZE)];
 733   if (p != NULL)
 734     {
 735       if (((instruction & p->opmask) == p->opcode)
 736           && tic4x_print_op (NULL, instruction, p, pc))
 737         tic4x_print_op (info, instruction, p, pc);
 738       else
 739         (*info->fprintf_func) (info->stream, "%08lx", instruction);
 740     }
 741   else
 742     {
 743       for (i = 0; i<TIC4X_SPESOP_SIZE; i++)
 744         if (optab_special[i] != NULL
 745             && optab_special[i]->opcode == instruction)
 746           {
 747             (*info->fprintf_func)(info->stream, "%s", optab_special[i]->name);
 748             break;
 749           }
 750       if (i == TIC4X_SPESOP_SIZE)
 751         (*info->fprintf_func) (info->stream, "%08lx", instruction);
 752     }
 753
 754   /* Return size of insn in words.  */
 755   return 1;
 756 }
 757
 758 /* The entry point from objdump and gdb.  */
 759 int
 760 print_insn_tic4x (bfd_vma memaddr, struct disassemble_info *info)
 761 {
 762   int status;
 763   unsigned long pc;
 764   unsigned long op;
 765   bfd_byte buffer[4];
 766
 767   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 768   if (status != 0)
 769     {
 770       (*info->memory_error_func) (status, memaddr, info);
 771       return -1;
 772     }
 773
 774   pc = memaddr;
 775   op = bfd_getl32 (buffer);
 776   info->bytes_per_line = 4;
 777   info->bytes_per_chunk = 4;
 778   info->octets_per_byte = 4;
 779   info->display_endian = BFD_ENDIAN_LITTLE;
 780   return tic4x_disassemble (pc, op, info) * 4;
 781 }