opcodes/tic4x-dis.c

   1 /* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils.
   2
   3    Copyright 2002, 2003 Free Software Foundation, Inc.
   4
   5    Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include <math.h>
  22 #include "libiberty.h"
  23 #include "dis-asm.h"
  24 #include "opcode/tic4x.h"
  25
  26 #define TIC4X_DEBUG 0
  27
  28 #define TIC4X_HASH_SIZE   11   /* 11 (bits) and above should give unique entries.  */
  29 #define TIC4X_SPESOP_SIZE 8    /* Max 8. ops for special instructions */
  30
  31 typedef enum
  32   {
  33     IMMED_SINT,
  34     IMMED_SUINT,
  35     IMMED_SFLOAT,
  36     IMMED_INT,
  37     IMMED_UINT,
  38     IMMED_FLOAT
  39   }
  40 immed_t;
  41
  42 typedef enum
  43   {
  44     INDIRECT_SHORT,
  45     INDIRECT_LONG,
  46     INDIRECT_TIC4X
  47   }
  48 indirect_t;
  49
  50 static int tic4x_version = 0;
  51 static int tic4x_dp = 0;
  52
  53 static int tic4x_pc_offset
  54   PARAMS ((unsigned int));
  55 static int tic4x_print_char
  56   PARAMS ((struct disassemble_info *, char));
  57 static int tic4x_print_str
  58   PARAMS ((struct disassemble_info *, char *));
  59 static int tic4x_print_register
  60   PARAMS ((struct disassemble_info *, unsigned long));
  61 static int tic4x_print_addr
  62   PARAMS ((struct disassemble_info *, unsigned long));
  63 static int tic4x_print_relative
  64   PARAMS ((struct disassemble_info *, unsigned long, long, unsigned long));
  65 void tic4x_print_ftoa
  66   PARAMS ((unsigned int, FILE *, fprintf_ftype));
  67 static int tic4x_print_direct
  68   PARAMS ((struct disassemble_info *, unsigned long));
  69 static int tic4x_print_immed
  70   PARAMS ((struct disassemble_info *, immed_t, unsigned long));
  71 static int tic4x_print_cond
  72   PARAMS ((struct disassemble_info *, unsigned int));
  73 static int tic4x_print_indirect
  74   PARAMS ((struct disassemble_info *, indirect_t, unsigned long));
  75 static int tic4x_print_op
  76   PARAMS ((struct disassemble_info *, unsigned long, tic4x_inst_t *, unsigned long));
  77 static void tic4x_hash_opcode_special
  78   PARAMS ((tic4x_inst_t **, const tic4x_inst_t *));
  79 static void tic4x_hash_opcode
  80   PARAMS ((tic4x_inst_t **, tic4x_inst_t **, const tic4x_inst_t *, unsigned long));
  81 static int tic4x_disassemble
  82   PARAMS ((unsigned long, unsigned long, struct disassemble_info *));
  83 int print_insn_tic4x
  84   PARAMS ((bfd_vma, struct disassemble_info *));
  85
  86
  87 static int
  88 tic4x_pc_offset (op)
  89      unsigned int op;
  90 {
  91   /* Determine the PC offset for a C[34]x instruction.
  92      This could be simplified using some boolean algebra
  93      but at the expense of readability.  */
  94   switch (op >> 24)
  95     {
  96     case 0x60:  /* br */
  97     case 0x62:  /* call  (C4x) */
  98     case 0x64:  /* rptb  (C4x) */
  99       return 1;
 100     case 0x61:  /* brd */
 101     case 0x63:  /* laj */
 102     case 0x65:  /* rptbd (C4x) */
 103       return 3;
 104     case 0x66:  /* swi */
 105     case 0x67:
 106       return 0;
 107     default:
 108       break;
 109     }
 110
 111   switch ((op & 0xffe00000) >> 20)
 112     {
 113     case 0x6a0: /* bB */
 114     case 0x720: /* callB */
 115     case 0x740: /* trapB */
 116       return 1;
 117
 118     case 0x6a2: /* bBd */
 119     case 0x6a6: /* bBat */
 120     case 0x6aa: /* bBaf */
 121     case 0x722: /* lajB */
 122     case 0x748: /* latB */
 123     case 0x798: /* rptbd */
 124       return 3;
 125
 126     default:
 127       break;
 128     }
 129
 130   switch ((op & 0xfe200000) >> 20)
 131     {
 132     case 0x6e0: /* dbB */
 133       return 1;
 134
 135     case 0x6e2: /* dbBd */
 136       return 3;
 137
 138     default:
 139       break;
 140     }
 141
 142   return 0;
 143 }
 144
 145 static int
 146 tic4x_print_char (info, ch)
 147      struct disassemble_info * info;
 148      char ch;
 149 {
 150   if (info != NULL)
 151     (*info->fprintf_func) (info->stream, "%c", ch);
 152   return 1;
 153 }
 154
 155 static int
 156 tic4x_print_str (info, str)
 157      struct disassemble_info *info;
 158      char *str;
 159 {
 160   if (info != NULL)
 161     (*info->fprintf_func) (info->stream, "%s", str);
 162   return 1;
 163 }
 164
 165 static int
 166 tic4x_print_register (info, regno)
 167      struct disassemble_info *info;
 168      unsigned long regno;
 169 {
 170   static tic4x_register_t **registertable = NULL;
 171   unsigned int i;
 172
 173   if (registertable == NULL)
 174     {
 175       registertable = (tic4x_register_t **)
 176         xmalloc (sizeof (tic4x_register_t *) * REG_TABLE_SIZE);
 177       for (i = 0; i < tic3x_num_registers; i++)
 178         registertable[tic3x_registers[i].regno] = (void *)&tic3x_registers[i];
 179       if (IS_CPU_TIC4X (tic4x_version))
 180         {
 181           /* Add C4x additional registers, overwriting
 182              any C3x registers if necessary.  */
 183           for (i = 0; i < tic4x_num_registers; i++)
 184             registertable[tic4x_registers[i].regno] = (void *)&tic4x_registers[i];
 185         }
 186     }
 187   if ((int) regno > (IS_CPU_TIC4X (tic4x_version) ? TIC4X_REG_MAX : TIC3X_REG_MAX))
 188     return 0;
 189   if (info != NULL)
 190     (*info->fprintf_func) (info->stream, "%s", registertable[regno]->name);
 191   return 1;
 192 }
 193
 194 static int
 195 tic4x_print_addr (info, addr)
 196      struct disassemble_info *info;
 197      unsigned long addr;
 198 {
 199   if (info != NULL)
 200     (*info->print_address_func)(addr, info);
 201   return 1;
 202 }
 203
 204 static int
 205 tic4x_print_relative (info, pc, offset, opcode)
 206      struct disassemble_info *info;
 207      unsigned long pc;
 208      long offset;
 209      unsigned long opcode;
 210 {
 211   return tic4x_print_addr (info, pc + offset + tic4x_pc_offset (opcode));
 212 }
 213
 214 static int
 215 tic4x_print_direct (info, arg)
 216      struct disassemble_info *info;
 217      unsigned long arg;
 218 {
 219   if (info != NULL)
 220     {
 221       (*info->fprintf_func) (info->stream, "@");
 222       tic4x_print_addr (info, arg + (tic4x_dp << 16));
 223     }
 224   return 1;
 225 }
 226
 227 /* FIXME: make the floating point stuff not rely on host
 228    floating point arithmetic.  */
 229 void
 230 tic4x_print_ftoa (val, stream, pfunc)
 231      unsigned int val;
 232      FILE *stream;
 233      fprintf_ftype pfunc;
 234 {
 235   int e;
 236   int s;
 237   int f;
 238   double num = 0.0;
 239
 240   e = EXTRS (val, 31, 24);      /* exponent */
 241   if (e != -128)
 242     {
 243       s = EXTRU (val, 23, 23);  /* sign bit */
 244       f = EXTRU (val, 22, 0);   /* mantissa */
 245       if (s)
 246         f += -2 * (1 << 23);
 247       else
 248         f += (1 << 23);
 249       num = f / (double)(1 << 23);
 250       num = ldexp (num, e);
 251     }
 252   (*pfunc)(stream, "%.9g", num);
 253 }
 254
 255 static int
 256 tic4x_print_immed (info, type, arg)
 257      struct disassemble_info *info;
 258      immed_t type;
 259      unsigned long arg;
 260 {
 261   int s;
 262   int f;
 263   int e;
 264   double num = 0.0;
 265
 266   if (info == NULL)
 267     return 1;
 268   switch (type)
 269     {
 270     case IMMED_SINT:
 271     case IMMED_INT:
 272       (*info->fprintf_func) (info->stream, "%d", (long)arg);
 273       break;
 274
 275     case IMMED_SUINT:
 276     case IMMED_UINT:
 277       (*info->fprintf_func) (info->stream, "%u", arg);
 278       break;
 279
 280     case IMMED_SFLOAT:
 281       e = EXTRS (arg, 15, 12);
 282       if (e != -8)
 283         {
 284           s = EXTRU (arg, 11, 11);
 285           f = EXTRU (arg, 10, 0);
 286           if (s)
 287             f += -2 * (1 << 11);
 288           else
 289             f += (1 << 11);
 290           num = f / (double)(1 << 11);
 291           num = ldexp (num, e);
 292         }
 293       (*info->fprintf_func) (info->stream, "%f", num);
 294       break;
 295     case IMMED_FLOAT:
 296       e = EXTRS (arg, 31, 24);
 297       if (e != -128)
 298         {
 299           s = EXTRU (arg, 23, 23);
 300           f = EXTRU (arg, 22, 0);
 301           if (s)
 302             f += -2 * (1 << 23);
 303           else
 304             f += (1 << 23);
 305           num = f / (double)(1 << 23);
 306           num = ldexp (num, e);
 307         }
 308       (*info->fprintf_func) (info->stream, "%f", num);
 309       break;
 310     }
 311   return 1;
 312 }
 313
 314 static int
 315 tic4x_print_cond (info, cond)
 316      struct disassemble_info *info;
 317      unsigned int cond;
 318 {
 319   static tic4x_cond_t **condtable = NULL;
 320   unsigned int i;
 321
 322   if (condtable == NULL)
 323     {
 324       condtable = (tic4x_cond_t **)xmalloc (sizeof (tic4x_cond_t *) * 32);
 325       for (i = 0; i < tic4x_num_conds; i++)
 326         condtable[tic4x_conds[i].cond] = (void *)&tic4x_conds[i];
 327     }
 328   if (cond > 31 || condtable[cond] == NULL)
 329     return 0;
 330   if (info != NULL)
 331     (*info->fprintf_func) (info->stream, "%s", condtable[cond]->name);
 332   return 1;
 333 }
 334
 335 static int
 336 tic4x_print_indirect (info, type, arg)
 337      struct disassemble_info *info;
 338      indirect_t type;
 339      unsigned long arg;
 340 {
 341   unsigned int aregno;
 342   unsigned int modn;
 343   unsigned int disp;
 344   char *a;
 345
 346   aregno = 0;
 347   modn = 0;
 348   disp = 1;
 349   switch(type)
 350     {
 351     case INDIRECT_TIC4X:                /* *+ARn(disp) */
 352       disp = EXTRU (arg, 7, 3);
 353       aregno = EXTRU (arg, 2, 0) + REG_AR0;
 354       modn = 0;
 355       break;
 356     case INDIRECT_SHORT:
 357       disp = 1;
 358       aregno = EXTRU (arg, 2, 0) + REG_AR0;
 359       modn = EXTRU (arg, 7, 3);
 360       break;
 361     case INDIRECT_LONG:
 362       disp = EXTRU (arg, 7, 0);
 363       aregno = EXTRU (arg, 10, 8) + REG_AR0;
 364       modn = EXTRU (arg, 15, 11);
 365       if (modn > 7 && disp != 0)
 366         return 0;
 367       break;
 368     default:
 369         (*info->fprintf_func)(info->stream, "# internal error: Unknown indirect type %d", type);
 370         return 0;
 371     }
 372   if (modn > TIC3X_MODN_MAX)
 373     return 0;
 374   a = tic4x_indirects[modn].name;
 375   while (*a)
 376     {
 377       switch (*a)
 378         {
 379         case 'a':
 380           tic4x_print_register (info, aregno);
 381           break;
 382         case 'd':
 383           tic4x_print_immed (info, IMMED_UINT, disp);
 384           break;
 385         case 'y':
 386           tic4x_print_str (info, "ir0");
 387           break;
 388         case 'z':
 389           tic4x_print_str (info, "ir1");
 390           break;
 391         default:
 392           tic4x_print_char (info, *a);
 393           break;
 394         }
 395       a++;
 396     }
 397   return 1;
 398 }
 399
 400 static int
 401 tic4x_print_op (info, instruction, p, pc)
 402      struct disassemble_info *info;
 403      unsigned long instruction;
 404      tic4x_inst_t *p;
 405      unsigned long pc;
 406 {
 407   int val;
 408   char *s;
 409   char *parallel = NULL;
 410
 411   /* Print instruction name.  */
 412   s = p->name;
 413   while (*s && parallel == NULL)
 414     {
 415       switch (*s)
 416         {
 417         case 'B':
 418           if (! tic4x_print_cond (info, EXTRU (instruction, 20, 16)))
 419             return 0;
 420           break;
 421         case 'C':
 422           if (! tic4x_print_cond (info, EXTRU (instruction, 27, 23)))
 423             return 0;
 424           break;
 425         case '_':
 426           parallel = s + 1;     /* Skip past `_' in name */
 427           break;
 428         default:
 429           tic4x_print_char (info, *s);
 430           break;
 431         }
 432       s++;
 433     }
 434
 435   /* Print arguments.  */
 436   s = p->args;
 437   if (*s)
 438     tic4x_print_char (info, ' ');
 439
 440   while (*s)
 441     {
 442       switch (*s)
 443         {
 444         case '*': /* indirect 0--15 */
 445           if (! tic4x_print_indirect (info, INDIRECT_LONG,
 446                                     EXTRU (instruction, 15, 0)))
 447             return 0;
 448           break;
 449
 450         case '#': /* only used for ldp, ldpk */
 451           tic4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0));
 452           break;
 453
 454         case '@': /* direct 0--15 */
 455           tic4x_print_direct (info, EXTRU (instruction, 15, 0));
 456           break;
 457
 458         case 'A': /* address register 24--22 */
 459           if (! tic4x_print_register (info, EXTRU (instruction, 24, 22) +
 460                                     REG_AR0))
 461             return 0;
 462           break;
 463
 464         case 'B': /* 24-bit unsigned int immediate br(d)/call/rptb
 465                      address 0--23.  */
 466           if (IS_CPU_TIC4X (tic4x_version))
 467             tic4x_print_relative (info, pc, EXTRS (instruction, 23, 0),
 468                                 p->opcode);
 469           else
 470             tic4x_print_addr (info, EXTRU (instruction, 23, 0));
 471           break;
 472
 473         case 'C': /* indirect (short C4x) 0--7 */
 474           if (! IS_CPU_TIC4X (tic4x_version))
 475             return 0;
 476           if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
 477                                     EXTRU (instruction, 7, 0)))
 478             return 0;
 479           break;
 480
 481         case 'D':
 482           /* Cockup if get here...  */
 483           break;
 484
 485         case 'E': /* register 0--7 */
 486         case 'e':
 487           if (! tic4x_print_register (info, EXTRU (instruction, 7, 0)))
 488             return 0;
 489           break;
 490
 491         case 'F': /* 16-bit float immediate 0--15 */
 492           tic4x_print_immed (info, IMMED_SFLOAT,
 493                            EXTRU (instruction, 15, 0));
 494           break;
 495
 496         case 'i': /* Extended indirect 0--7 */
 497           if ( EXTRU (instruction, 7, 5) == 7 )
 498             {
 499               if( !tic4x_print_register (info, EXTRU (instruction, 4, 0)) )
 500                 return 0;
 501               break;
 502             }
 503           /* Fallthrough */
 504
 505         case 'I': /* indirect (short) 0--7 */
 506           if (! tic4x_print_indirect (info, INDIRECT_SHORT,
 507                                     EXTRU (instruction, 7, 0)))
 508             return 0;
 509           break;
 510
 511         case 'j': /* Extended indirect 8--15 */
 512           if ( EXTRU (instruction, 15, 13) == 7 )
 513             {
 514               if( !tic4x_print_register (info, EXTRU (instruction, 12, 8)) )
 515                 return 0;
 516               break;
 517             }
 518
 519         case 'J': /* indirect (short) 8--15 */
 520           if (! tic4x_print_indirect (info, INDIRECT_SHORT,
 521                                     EXTRU (instruction, 15, 8)))
 522             return 0;
 523           break;
 524
 525         case 'G': /* register 8--15 */
 526         case 'g':
 527           if (! tic4x_print_register (info, EXTRU (instruction, 15, 8)))
 528             return 0;
 529           break;
 530
 531         case 'H': /* register 16--18 */
 532           if (! tic4x_print_register (info, EXTRU (instruction, 18, 16)))
 533             return 0;
 534           break;
 535
 536         case 'K': /* register 19--21 */
 537           if (! tic4x_print_register (info, EXTRU (instruction, 21, 19)))
 538             return 0;
 539           break;
 540
 541         case 'L': /* register 22--24 */
 542           if (! tic4x_print_register (info, EXTRU (instruction, 24, 22)))
 543             return 0;
 544           break;
 545
 546         case 'M': /* register 22--22 */
 547           tic4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2);
 548           break;
 549
 550         case 'N': /* register 23--23 */
 551           tic4x_print_register (info, EXTRU (instruction, 23, 23) + REG_R0);
 552           break;
 553
 554         case 'O': /* indirect (short C4x) 8--15 */
 555           if (! IS_CPU_TIC4X (tic4x_version))
 556             return 0;
 557           if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
 558                                     EXTRU (instruction, 15, 8)))
 559             return 0;
 560           break;
 561
 562         case 'P': /* displacement 0--15 (used by Bcond and BcondD) */
 563           tic4x_print_relative (info, pc, EXTRS (instruction, 15, 0),
 564                               p->opcode);
 565           break;
 566
 567         case 'Q': /* register 0--15 */
 568         case 'q':
 569           if (! tic4x_print_register (info, EXTRU (instruction, 15, 0)))
 570             return 0;
 571           break;
 572
 573         case 'R': /* register 16--20 */
 574         case 'r':
 575           if (! tic4x_print_register (info, EXTRU (instruction, 20, 16)))
 576             return 0;
 577           break;
 578
 579         case 'S': /* 16-bit signed immediate 0--15 */
 580           tic4x_print_immed (info, IMMED_SINT,
 581                            EXTRS (instruction, 15, 0));
 582           break;
 583
 584         case 'T': /* 5-bit signed immediate 16--20  (C4x stik) */
 585           if (! IS_CPU_TIC4X (tic4x_version))
 586             return 0;
 587           if (! tic4x_print_immed (info, IMMED_SUINT,
 588                                  EXTRU (instruction, 20, 16)))
 589             return 0;
 590           break;
 591
 592         case 'U': /* 16-bit unsigned int immediate 0--15 */
 593           tic4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0));
 594           break;
 595
 596         case 'V': /* 5/9-bit unsigned vector 0--4/8 */
 597           tic4x_print_immed (info, IMMED_SUINT,
 598                            IS_CPU_TIC4X (tic4x_version) ?
 599                            EXTRU (instruction, 8, 0) :
 600                            EXTRU (instruction, 4, 0) & ~0x20);
 601           break;
 602
 603         case 'W': /* 8-bit signed immediate 0--7 */
 604           if (! IS_CPU_TIC4X (tic4x_version))
 605             return 0;
 606           tic4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 7, 0));
 607           break;
 608
 609         case 'X': /* expansion register 4--0 */
 610           val = EXTRU (instruction, 4, 0) + REG_IVTP;
 611           if (val < REG_IVTP || val > REG_TVTP)
 612             return 0;
 613           if (! tic4x_print_register (info, val))
 614             return 0;
 615           break;
 616
 617         case 'Y': /* address register 16--20 */
 618           val = EXTRU (instruction, 20, 16);
 619           if (val < REG_AR0 || val > REG_SP)
 620             return 0;
 621           if (! tic4x_print_register (info, val))
 622             return 0;
 623           break;
 624
 625         case 'Z': /* expansion register 16--20 */
 626           val = EXTRU (instruction, 20, 16) + REG_IVTP;
 627           if (val < REG_IVTP || val > REG_TVTP)
 628             return 0;
 629           if (! tic4x_print_register (info, val))
 630             return 0;
 631           break;
 632
 633         case '|':               /* Parallel instruction */
 634           tic4x_print_str (info, " || ");
 635           tic4x_print_str (info, parallel);
 636           tic4x_print_char (info, ' ');
 637           break;
 638
 639         case ';':
 640           tic4x_print_char (info, ',');
 641           break;
 642
 643         default:
 644           tic4x_print_char (info, *s);
 645           break;
 646         }
 647       s++;
 648     }
 649   return 1;
 650 }
 651
 652 static void
 653 tic4x_hash_opcode_special (optable_special, inst)
 654      tic4x_inst_t **optable_special;
 655      const tic4x_inst_t *inst;
 656 {
 657   int i;
 658
 659   for( i=0; i<TIC4X_SPESOP_SIZE; i++ )
 660     if( optable_special[i] != NULL
 661         && optable_special[i]->opcode == inst->opcode )
 662       {
 663         /* Collision (we have it already) - overwrite */
 664         optable_special[i] = (void *)inst;
 665         return;
 666       }
 667
 668   for( i=0; i<TIC4X_SPESOP_SIZE; i++ )
 669     if( optable_special[i] == NULL )
 670       {
 671         /* Add the new opcode */
 672         optable_special[i] = (void *)inst;
 673         return;
 674       }
 675
 676   /* This should never occur. This happens if the number of special
 677      instructions exceeds TIC4X_SPESOP_SIZE. Please increase the variable
 678      of this variable */
 679 #if TIC4X_DEBUG
 680   printf("optable_special[] is full, please increase TIC4X_SPESOP_SIZE!\n");
 681 #endif
 682 }
 683
 684 static void
 685 tic4x_hash_opcode (optable, optable_special, inst, tic4x_oplevel)
 686      tic4x_inst_t **optable;
 687      tic4x_inst_t **optable_special;
 688      const tic4x_inst_t *inst;
 689      const unsigned long tic4x_oplevel;
 690 {
 691   int j;
 692   int opcode = inst->opcode >> (32 - TIC4X_HASH_SIZE);
 693   int opmask = inst->opmask >> (32 - TIC4X_HASH_SIZE);
 694
 695   /* Use a TIC4X_HASH_SIZE bit index as a hash index.  We should
 696      have unique entries so there's no point having a linked list
 697      for each entry? */
 698   for (j = opcode; j < opmask; j++)
 699     if ( (j & opmask) == opcode
 700          && inst->oplevel & tic4x_oplevel )
 701       {
 702 #if TIC4X_DEBUG
 703         /* We should only have collisions for synonyms like
 704            ldp for ldi.  */
 705         if (optable[j] != NULL)
 706           printf("Collision at index %d, %s and %s\n",
 707                  j, optable[j]->name, inst->name);
 708 #endif
 709         /* Catch those ops that collide with others already inside the
 710            hash, and have a opmask greater than the one we use in the
 711            hash. Store them in a special-list, that will handle full
 712            32-bit INSN, not only the first 11-bit (or so). */
 713         if ( optable[j] != NULL
 714              && inst->opmask & ~(opmask << (32 - TIC4X_HASH_SIZE)) )
 715           {
 716             /* Add the instruction already on the list */
 717             tic4x_hash_opcode_special(optable_special, optable[j]);
 718
 719             /* Add the new instruction */
 720             tic4x_hash_opcode_special(optable_special, inst);
 721           }
 722
 723         optable[j] = (void *)inst;
 724       }
 725 }
 726
 727 /* Disassemble the instruction in 'instruction'.
 728    'pc' should be the address of this instruction, it will
 729    be used to print the target address if this is a relative jump or call
 730    the disassembled instruction is written to 'info'.
 731    The function returns the length of this instruction in words.  */
 732
 733 static int
 734 tic4x_disassemble (pc, instruction, info)
 735      unsigned long pc;
 736      unsigned long instruction;
 737      struct disassemble_info *info;
 738 {
 739   static tic4x_inst_t **optable = NULL;
 740   static tic4x_inst_t **optable_special = NULL;
 741   tic4x_inst_t *p;
 742   int i;
 743   unsigned long tic4x_oplevel;
 744
 745   tic4x_version = info->mach;
 746
 747   tic4x_oplevel  = (IS_CPU_TIC4X (tic4x_version)) ? OP_C4X : 0;
 748   tic4x_oplevel |= OP_C3X|OP_LPWR|OP_IDLE2|OP_ENH;
 749
 750   if (optable == NULL)
 751     {
 752       optable = (tic4x_inst_t **)
 753         xcalloc (sizeof (tic4x_inst_t *), (1 << TIC4X_HASH_SIZE));
 754
 755       optable_special = (tic4x_inst_t **)
 756         xcalloc (sizeof (tic4x_inst_t *), TIC4X_SPESOP_SIZE );
 757
 758       /* Install opcodes in reverse order so that preferred
 759          forms overwrite synonyms.  */
 760       for (i = tic4x_num_insts - 1; i >= 0; i--)
 761         tic4x_hash_opcode (optable, optable_special, &tic4x_insts[i], tic4x_oplevel);
 762
 763       /* We now need to remove the insn that are special from the
 764          "normal" optable, to make the disasm search this extra list
 765          for them.
 766       */
 767       for (i=0; i<TIC4X_SPESOP_SIZE; i++)
 768         if ( optable_special[i] != NULL )
 769           optable[optable_special[i]->opcode >> (32 - TIC4X_HASH_SIZE)] = NULL;
 770     }
 771
 772   /* See if we can pick up any loading of the DP register...  */
 773   if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70)
 774     tic4x_dp = EXTRU (instruction, 15, 0);
 775
 776   p = optable[instruction >> (32 - TIC4X_HASH_SIZE)];
 777   if ( p != NULL )
 778     {
 779       if ( ((instruction & p->opmask) == p->opcode)
 780            && tic4x_print_op (NULL, instruction, p, pc) )
 781         tic4x_print_op (info, instruction, p, pc);
 782       else
 783         (*info->fprintf_func) (info->stream, "%08x", instruction);
 784     }
 785   else
 786     {
 787       for (i = 0; i<TIC4X_SPESOP_SIZE; i++)
 788         if (optable_special[i] != NULL
 789             && optable_special[i]->opcode == instruction )
 790           {
 791             (*info->fprintf_func)(info->stream, "%s", optable_special[i]->name);
 792             break;
 793           }
 794       if (i==TIC4X_SPESOP_SIZE)
 795         (*info->fprintf_func) (info->stream, "%08x", instruction);
 796     }
 797
 798   /* Return size of insn in words.  */
 799   return 1;
 800 }
 801
 802 /* The entry point from objdump and gdb.  */
 803 int
 804 print_insn_tic4x (memaddr, info)
 805      bfd_vma memaddr;
 806      struct disassemble_info *info;
 807 {
 808   int status;
 809   unsigned long pc;
 810   unsigned long op;
 811   bfd_byte buffer[4];
 812
 813   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 814   if (status != 0)
 815     {
 816       (*info->memory_error_func) (status, memaddr, info);
 817       return -1;
 818     }
 819
 820   pc = memaddr;
 821   op = bfd_getl32 (buffer);
 822   info->bytes_per_line = 4;
 823   info->bytes_per_chunk = 4;
 824   info->octets_per_byte = 4;
 825   info->display_endian = BFD_ENDIAN_LITTLE;
 826   return tic4x_disassemble (pc, op, info) * 4;
 827 }