opcodes/arc-dis.c

   1 /* Instruction printing code for the ARC.
   2    Copyright 1994, 1995, 1997, 1998, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4    Contributed by Doug Evans (dje@cygnus.com).
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "ansidecl.h"
  21 #include "libiberty.h"
  22 #include "dis-asm.h"
  23 #include "opcode/arc.h"
  24 #include "elf-bfd.h"
  25 #include "elf/arc.h"
  26 #include <string.h>
  27 #include "opintl.h"
  28
  29 #include <stdarg.h>
  30 #include "arc-dis.h"
  31 #include "arc-ext.h"
  32
  33 #ifndef dbg
  34 #define dbg (0)
  35 #endif
  36
  37 #define BIT(word,n)     ((word) & (1 << n))
  38 #define BITS(word,s,e)  (((word) << (31 - e)) >> (s + (31 - e)))
  39 #define OPCODE(word)    (BITS ((word), 27, 31))
  40 #define FIELDA(word)    (BITS ((word), 21, 26))
  41 #define FIELDB(word)    (BITS ((word), 15, 20))
  42 #define FIELDC(word)    (BITS ((word),  9, 14))
  43
  44 /* FIELD D is signed in all of its uses, so we make sure argument is
  45    treated as signed for bit shifting purposes:  */
  46 #define FIELDD(word)    (BITS (((signed int)word), 0, 8))
  47
  48 #define PUT_NEXT_WORD_IN(a)                                             \
  49   do                                                                    \
  50     {                                                                   \
  51       if (is_limm == 1 && !NEXT_WORD (1))                               \
  52         mwerror (state, _("Illegal limm reference in last instruction!\n")); \
  53       a = state->words[1];                                              \
  54     }                                                                   \
  55   while (0)
  56
  57 #define CHECK_FLAG_COND_NULLIFY()                               \
  58   do                                                            \
  59     {                                                           \
  60       if (is_shimm == 0)                                        \
  61         {                                                       \
  62           flag = BIT (state->words[0], 8);                      \
  63           state->nullifyMode = BITS (state->words[0], 5, 6);    \
  64           cond = BITS (state->words[0], 0, 4);                  \
  65         }                                                       \
  66     }                                                           \
  67   while (0)
  68
  69 #define CHECK_COND()                            \
  70   do                                            \
  71     {                                           \
  72       if (is_shimm == 0)                        \
  73         cond = BITS (state->words[0], 0, 4);    \
  74     }                                           \
  75   while (0)
  76
  77 #define CHECK_FIELD(field)                      \
  78   do                                            \
  79     {                                           \
  80       if (field == 62)                          \
  81         {                                       \
  82           is_limm++;                            \
  83           field##isReg = 0;                     \
  84           PUT_NEXT_WORD_IN (field);             \
  85           limm_value = field;                   \
  86         }                                       \
  87       else if (field > 60)                      \
  88         {                                       \
  89           field##isReg = 0;                     \
  90           is_shimm++;                           \
  91           flag = (field == 61);                 \
  92           field = FIELDD (state->words[0]);     \
  93         }                                       \
  94     }                                           \
  95   while (0)
  96
  97 #define CHECK_FIELD_A()                         \
  98   do                                            \
  99     {                                           \
 100       fieldA = FIELDA (state->words[0]);        \
 101       if (fieldA > 60)                          \
 102         {                                       \
 103           fieldAisReg = 0;                      \
 104           fieldA = 0;                           \
 105         }                                       \
 106     }                                           \
 107   while (0)
 108
 109 #define CHECK_FIELD_B()                         \
 110   do                                            \
 111     {                                           \
 112       fieldB = FIELDB (state->words[0]);        \
 113       CHECK_FIELD (fieldB);                     \
 114     }                                           \
 115   while (0)
 116
 117 #define CHECK_FIELD_C()                         \
 118   do                                            \
 119     {                                           \
 120       fieldC = FIELDC (state->words[0]);        \
 121       CHECK_FIELD (fieldC);                     \
 122     }                                           \
 123   while (0)
 124
 125 #define IS_SMALL(x) (((field##x) < 256) && ((field##x) > -257))
 126 #define IS_REG(x)   (field##x##isReg)
 127 #define WRITE_FORMAT_LB_Rx_RB(x)     WRITE_FORMAT(x,"[","]","","")
 128 #define WRITE_FORMAT_x_COMMA_LB(x)   WRITE_FORMAT(x,"",",[","",",[")
 129 #define WRITE_FORMAT_COMMA_x_RB(x)   WRITE_FORMAT(x,",","]",",","]")
 130 #define WRITE_FORMAT_x_RB(x)         WRITE_FORMAT(x,"","]","","]")
 131 #define WRITE_FORMAT_COMMA_x(x)      WRITE_FORMAT(x,",","",",","")
 132 #define WRITE_FORMAT_x_COMMA(x)      WRITE_FORMAT(x,"",",","",",")
 133 #define WRITE_FORMAT_x(x)            WRITE_FORMAT(x,"","","","")
 134 #define WRITE_FORMAT(x,cb1,ca1,cb,ca) strcat (formatString,             \
 135                                      (IS_REG (x) ? cb1"%r"ca1 :         \
 136                                       usesAuxReg ? cb"%a"ca :           \
 137                                       IS_SMALL (x) ? cb"%d"ca : cb"%h"ca))
 138 #define WRITE_FORMAT_RB()       strcat (formatString, "]")
 139 #define WRITE_COMMENT(str)      (state->comm[state->commNum++] = (str))
 140 #define WRITE_NOP_COMMENT()     if (!fieldAisReg && !flag) WRITE_COMMENT ("nop");
 141
 142 #define NEXT_WORD(x)    (offset += 4, state->words[x])
 143
 144 #define add_target(x)   (state->targets[state->tcnt++] = (x))
 145
 146 static char comment_prefix[] = "\t; ";
 147
 148 static const char *core_reg_name PARAMS ((struct arcDisState *, int));
 149 static const char *aux_reg_name PARAMS ((struct arcDisState *, int));
 150 static const char *cond_code_name PARAMS ((struct arcDisState *, int));
 151 static const char *instruction_name
 152   PARAMS ((struct arcDisState *, int, int, int *));
 153 static void mwerror PARAMS ((struct arcDisState *, const char *));
 154 static const char *post_address PARAMS ((struct arcDisState *, int));
 155 static void write_comments_
 156   PARAMS ((struct arcDisState *, int, int, long int));
 157 static void write_instr_name_
 158   PARAMS ((struct arcDisState *, const char *, int, int, int, int, int, int));
 159 static int dsmOneArcInst PARAMS ((bfd_vma, struct arcDisState *));
 160 static const char *_coreRegName PARAMS ((void *, int));
 161 static int decodeInstr PARAMS ((bfd_vma, disassemble_info *));
 162
 163 static const char *
 164 core_reg_name (state, val)
 165      struct arcDisState * state;
 166      int                  val;
 167 {
 168   if (state->coreRegName)
 169     return (*state->coreRegName)(state->_this, val);
 170   return 0;
 171 }
 172
 173 static const char *
 174 aux_reg_name (state, val)
 175      struct arcDisState * state;
 176      int                  val;
 177 {
 178   if (state->auxRegName)
 179     return (*state->auxRegName)(state->_this, val);
 180   return 0;
 181 }
 182
 183 static const char *
 184 cond_code_name (state, val)
 185      struct arcDisState * state;
 186      int                  val;
 187 {
 188   if (state->condCodeName)
 189     return (*state->condCodeName)(state->_this, val);
 190   return 0;
 191 }
 192
 193 static const char *
 194 instruction_name (state, op1, op2, flags)
 195      struct arcDisState * state;
 196      int    op1;
 197      int    op2;
 198      int *  flags;
 199 {
 200   if (state->instName)
 201     return (*state->instName)(state->_this, op1, op2, flags);
 202   return 0;
 203 }
 204
 205 static void
 206 mwerror (state, msg)
 207      struct arcDisState * state;
 208      const char * msg;
 209 {
 210   if (state->err != 0)
 211     (*state->err)(state->_this, (msg));
 212 }
 213
 214 static const char *
 215 post_address (state, addr)
 216      struct arcDisState * state;
 217      int addr;
 218 {
 219   static char id[3 * ARRAY_SIZE (state->addresses)];
 220   int j, i = state->acnt;
 221
 222   if (i < ((int) ARRAY_SIZE (state->addresses)))
 223     {
 224       state->addresses[i] = addr;
 225       ++state->acnt;
 226       j = i*3;
 227       id[j+0] = '@';
 228       id[j+1] = '0'+i;
 229       id[j+2] = 0;
 230
 231       return id + j;
 232     }
 233   return "";
 234 }
 235
 236 static void my_sprintf PARAMS ((struct arcDisState *, char *, const char *,
 237                                 ...));
 238
 239 static void
 240 my_sprintf VPARAMS ((struct arcDisState *state, char *buf, const char *format,
 241                      ...))
 242 {
 243   char *bp;
 244   const char *p;
 245   int size, leading_zero, regMap[2];
 246   long auxNum;
 247
 248   VA_OPEN (ap, format);
 249   VA_FIXEDARG (ap, struct arcDisState *, state);
 250   VA_FIXEDARG (ap, char *, buf);
 251   VA_FIXEDARG (ap, const char *, format);
 252
 253   bp = buf;
 254   *bp = 0;
 255   p = format;
 256   auxNum = -1;
 257   regMap[0] = 0;
 258   regMap[1] = 0;
 259
 260   while (1)
 261     switch (*p++)
 262       {
 263       case 0:
 264         goto DOCOMM; /* (return)  */
 265       default:
 266         *bp++ = p[-1];
 267         break;
 268       case '%':
 269         size = 0;
 270         leading_zero = 0;
 271       RETRY: ;
 272         switch (*p++)
 273           {
 274           case '0':
 275           case '1':
 276           case '2':
 277           case '3':
 278           case '4':
 279           case '5':
 280           case '6':
 281           case '7':
 282           case '8':
 283           case '9':
 284             {
 285               /* size.  */
 286               size = p[-1] - '0';
 287               if (size == 0)
 288                 leading_zero = 1; /* e.g. %08x  */
 289               while (*p >= '0' && *p <= '9')
 290                 {
 291                   size = size * 10 + *p - '0';
 292                   p++;
 293                 }
 294               goto RETRY;
 295             }
 296 #define inc_bp() bp = bp + strlen (bp)
 297
 298           case 'h':
 299             {
 300               unsigned u = va_arg (ap, int);
 301
 302               /* Hex.  We can change the format to 0x%08x in
 303                  one place, here, if we wish.
 304                  We add underscores for easy reading.  */
 305               if (u > 65536)
 306                 sprintf (bp, "0x%x_%04x", u >> 16, u & 0xffff);
 307               else
 308                 sprintf (bp, "0x%x", u);
 309               inc_bp ();
 310             }
 311             break;
 312           case 'X': case 'x':
 313             {
 314               int val = va_arg (ap, int);
 315
 316               if (size != 0)
 317                 if (leading_zero)
 318                   sprintf (bp, "%0*x", size, val);
 319                 else
 320                   sprintf (bp, "%*x", size, val);
 321               else
 322                 sprintf (bp, "%x", val);
 323               inc_bp ();
 324             }
 325             break;
 326           case 'd':
 327             {
 328               int val = va_arg (ap, int);
 329
 330               if (size != 0)
 331                 sprintf (bp, "%*d", size, val);
 332               else
 333                 sprintf (bp, "%d", val);
 334               inc_bp ();
 335             }
 336             break;
 337           case 'r':
 338             {
 339               /* Register.  */
 340               int val = va_arg (ap, int);
 341
 342 #define REG2NAME(num, name) case num: sprintf (bp, ""name); \
 343   regMap[(num < 32) ? 0 : 1] |= 1 << (num - ((num < 32) ? 0 : 32)); break;
 344
 345               switch (val)
 346                 {
 347                   REG2NAME (26, "gp");
 348                   REG2NAME (27, "fp");
 349                   REG2NAME (28, "sp");
 350                   REG2NAME (29, "ilink1");
 351                   REG2NAME (30, "ilink2");
 352                   REG2NAME (31, "blink");
 353                   REG2NAME (60, "lp_count");
 354                 default:
 355                   {
 356                     const char * ext;
 357
 358                     ext = core_reg_name (state, val);
 359                     if (ext)
 360                       sprintf (bp, "%s", ext);
 361                     else
 362                       sprintf (bp,"r%d",val);
 363                   }
 364                   break;
 365                 }
 366               inc_bp ();
 367             } break;
 368
 369           case 'a':
 370             {
 371               /* Aux Register.  */
 372               int val = va_arg (ap, int);
 373
 374 #define AUXREG2NAME(num, name) case num: sprintf (bp,name); break;
 375
 376               switch (val)
 377                 {
 378                   AUXREG2NAME (0x0, "status");
 379                   AUXREG2NAME (0x1, "semaphore");
 380                   AUXREG2NAME (0x2, "lp_start");
 381                   AUXREG2NAME (0x3, "lp_end");
 382                   AUXREG2NAME (0x4, "identity");
 383                   AUXREG2NAME (0x5, "debug");
 384                 default:
 385                   {
 386                     const char *ext;
 387
 388                     ext = aux_reg_name (state, val);
 389                     if (ext)
 390                       sprintf (bp, "%s", ext);
 391                     else
 392                       my_sprintf (state, bp, "%h", val);
 393                   }
 394                   break;
 395                 }
 396               inc_bp ();
 397             }
 398             break;
 399
 400           case 's':
 401             {
 402               sprintf (bp, "%s", va_arg (ap, char *));
 403               inc_bp ();
 404             }
 405             break;
 406
 407           default:
 408             fprintf (stderr, "?? format %c\n", p[-1]);
 409             break;
 410           }
 411       }
 412
 413  DOCOMM: *bp = 0;
 414   VA_CLOSE (ap);
 415 }
 416
 417 static void
 418 write_comments_(state, shimm, is_limm, limm_value)
 419      struct arcDisState * state;
 420      int shimm;
 421      int is_limm;
 422      long limm_value;
 423 {
 424   if (state->commentBuffer != 0)
 425     {
 426       int i;
 427
 428       if (is_limm)
 429         {
 430           const char *name = post_address (state, limm_value + shimm);
 431
 432           if (*name != 0)
 433             WRITE_COMMENT (name);
 434         }
 435       for (i = 0; i < state->commNum; i++)
 436         {
 437           if (i == 0)
 438             strcpy (state->commentBuffer, comment_prefix);
 439           else
 440             strcat (state->commentBuffer, ", ");
 441           strncat (state->commentBuffer, state->comm[i],
 442                    sizeof (state->commentBuffer));
 443         }
 444     }
 445 }
 446
 447 #define write_comments2(x) write_comments_(state, x, is_limm, limm_value)
 448 #define write_comments() write_comments2(0)
 449
 450 static const char *condName[] = {
 451   /* 0..15.  */
 452   ""   , "z"  , "nz" , "p"  , "n"  , "c"  , "nc" , "v"  ,
 453   "nv" , "gt" , "ge" , "lt" , "le" , "hi" , "ls" , "pnz"
 454 };
 455
 456 static void
 457 write_instr_name_(state, instrName, cond, condCodeIsPartOfName, flag, signExtend, addrWriteBack, directMem)
 458      struct arcDisState * state;
 459      const char * instrName;
 460      int cond;
 461      int condCodeIsPartOfName;
 462      int flag;
 463      int signExtend;
 464      int addrWriteBack;
 465      int directMem;
 466 {
 467   strcpy (state->instrBuffer, instrName);
 468
 469   if (cond > 0)
 470     {
 471       const char *cc = 0;
 472
 473       if (!condCodeIsPartOfName)
 474         strcat (state->instrBuffer, ".");
 475
 476       if (cond < 16)
 477         cc = condName[cond];
 478       else
 479         cc = cond_code_name (state, cond);
 480
 481       if (!cc)
 482         cc = "???";
 483
 484       strcat (state->instrBuffer, cc);
 485     }
 486
 487   if (flag)
 488     strcat (state->instrBuffer, ".f");
 489
 490   switch (state->nullifyMode)
 491     {
 492     case BR_exec_always:
 493       strcat (state->instrBuffer, ".d");
 494       break;
 495     case BR_exec_when_jump:
 496       strcat (state->instrBuffer, ".jd");
 497       break;
 498     }
 499
 500   if (signExtend)
 501     strcat (state->instrBuffer, ".x");
 502
 503   if (addrWriteBack)
 504     strcat (state->instrBuffer, ".a");
 505
 506   if (directMem)
 507     strcat (state->instrBuffer, ".di");
 508 }
 509
 510 #define write_instr_name()                                              \
 511   do                                                                    \
 512     {                                                                   \
 513       write_instr_name_(state, instrName,cond, condCodeIsPartOfName,    \
 514                         flag, signExtend, addrWriteBack, directMem);    \
 515       formatString[0] = '\0';                                           \
 516     }                                                                   \
 517   while (0)
 518
 519 enum {
 520   op_LD0 = 0, op_LD1 = 1, op_ST  = 2, op_3   = 3,
 521   op_BC  = 4, op_BLC = 5, op_LPC = 6, op_JC  = 7,
 522   op_ADD = 8, op_ADC = 9, op_SUB = 10, op_SBC = 11,
 523   op_AND = 12, op_OR  = 13, op_BIC = 14, op_XOR = 15
 524 };
 525
 526 extern disassemble_info tm_print_insn_info;
 527
 528 static int
 529 dsmOneArcInst (addr, state)
 530      bfd_vma              addr;
 531      struct arcDisState * state;
 532 {
 533   int condCodeIsPartOfName = 0;
 534   int decodingClass;
 535   const char * instrName;
 536   int repeatsOp = 0;
 537   int fieldAisReg = 1;
 538   int fieldBisReg = 1;
 539   int fieldCisReg = 1;
 540   int fieldA;
 541   int fieldB;
 542   int fieldC = 0;
 543   int flag = 0;
 544   int cond = 0;
 545   int is_shimm = 0;
 546   int is_limm = 0;
 547   long limm_value = 0;
 548   int signExtend = 0;
 549   int addrWriteBack = 0;
 550   int directMem = 0;
 551   int is_linked = 0;
 552   int offset = 0;
 553   int usesAuxReg = 0;
 554   int flags;
 555   int ignoreFirstOpd;
 556   char formatString[60];
 557
 558   state->instructionLen = 4;
 559   state->nullifyMode = BR_exec_when_no_jump;
 560   state->opWidth = 12;
 561   state->isBranch = 0;
 562
 563   state->_mem_load = 0;
 564   state->_ea_present = 0;
 565   state->_load_len = 0;
 566   state->ea_reg1 = no_reg;
 567   state->ea_reg2 = no_reg;
 568   state->_offset = 0;
 569
 570   if (! NEXT_WORD (0))
 571     return 0;
 572
 573   state->_opcode = OPCODE (state->words[0]);
 574   instrName = 0;
 575   decodingClass = 0; /* default!  */
 576   repeatsOp = 0;
 577   condCodeIsPartOfName=0;
 578   state->commNum = 0;
 579   state->tcnt = 0;
 580   state->acnt = 0;
 581   state->flow = noflow;
 582   ignoreFirstOpd = 0;
 583
 584   if (state->commentBuffer)
 585     state->commentBuffer[0] = '\0';
 586
 587   switch (state->_opcode)
 588     {
 589     case op_LD0:
 590       switch (BITS (state->words[0],1,2))
 591         {
 592         case 0:
 593           instrName = "ld";
 594           state->_load_len = 4;
 595           break;
 596         case 1:
 597           instrName = "ldb";
 598           state->_load_len = 1;
 599           break;
 600         case 2:
 601           instrName = "ldw";
 602           state->_load_len = 2;
 603           break;
 604         default:
 605           instrName = "??? (0[3])";
 606           state->flow = invalid_instr;
 607           break;
 608         }
 609       decodingClass = 5;
 610       break;
 611
 612     case op_LD1:
 613       if (BIT (state->words[0],13))
 614         {
 615           instrName = "lr";
 616           decodingClass = 10;
 617         }
 618       else
 619         {
 620           switch (BITS (state->words[0],10,11))
 621             {
 622             case 0:
 623               instrName = "ld";
 624               state->_load_len = 4;
 625               break;
 626             case 1:
 627               instrName = "ldb";
 628               state->_load_len = 1;
 629               break;
 630             case 2:
 631               instrName = "ldw";
 632               state->_load_len = 2;
 633               break;
 634             default:
 635               instrName = "??? (1[3])";
 636               state->flow = invalid_instr;
 637               break;
 638             }
 639           decodingClass = 6;
 640         }
 641       break;
 642
 643     case op_ST:
 644       if (BIT (state->words[0],25))
 645         {
 646           instrName = "sr";
 647           decodingClass = 8;
 648         }
 649       else
 650         {
 651           switch (BITS (state->words[0],22,23))
 652             {
 653             case 0:
 654               instrName = "st";
 655               break;
 656             case 1:
 657               instrName = "stb";
 658               break;
 659             case 2:
 660               instrName = "stw";
 661               break;
 662             default:
 663               instrName = "??? (2[3])";
 664               state->flow = invalid_instr;
 665               break;
 666             }
 667           decodingClass = 7;
 668         }
 669       break;
 670
 671     case op_3:
 672       decodingClass = 1;  /* default for opcode 3...  */
 673       switch (FIELDC (state->words[0]))
 674         {
 675         case  0:
 676           instrName = "flag";
 677           decodingClass = 2;
 678           break;
 679         case  1:
 680           instrName = "asr";
 681           break;
 682         case  2:
 683           instrName = "lsr";
 684           break;
 685         case  3:
 686           instrName = "ror";
 687           break;
 688         case  4:
 689           instrName = "rrc";
 690           break;
 691         case  5:
 692           instrName = "sexb";
 693           break;
 694         case  6:
 695           instrName = "sexw";
 696           break;
 697         case  7:
 698           instrName = "extb";
 699           break;
 700         case  8:
 701           instrName = "extw";
 702           break;
 703         case  0x3f:
 704           {
 705             decodingClass = 9;
 706             switch( FIELDD (state->words[0]) )
 707               {
 708               case 0:
 709                 instrName = "brk";
 710                 break;
 711               case 1:
 712                 instrName = "sleep";
 713                 break;
 714               case 2:
 715                 instrName = "swi";
 716                 break;
 717               default:
 718                 instrName = "???";
 719                 state->flow=invalid_instr;
 720                 break;
 721               }
 722           }
 723           break;
 724
 725           /* ARC Extension Library Instructions
 726              NOTE: We assume that extension codes are these instrs.  */
 727         default:
 728           instrName = instruction_name (state,
 729                                         state->_opcode,
 730                                         FIELDC (state->words[0]),
 731                                         &flags);
 732           if (!instrName)
 733             {
 734               instrName = "???";
 735               state->flow = invalid_instr;
 736             }
 737           if (flags & IGNORE_FIRST_OPD)
 738             ignoreFirstOpd = 1;
 739           break;
 740         }
 741       break;
 742
 743     case op_BC:
 744       instrName = "b";
 745     case op_BLC:
 746       if (!instrName)
 747         instrName = "bl";
 748     case op_LPC:
 749       if (!instrName)
 750         instrName = "lp";
 751     case op_JC:
 752       if (!instrName)
 753         {
 754           if (BITS (state->words[0],9,9))
 755             {
 756               instrName = "jl";
 757               is_linked = 1;
 758             }
 759           else
 760             {
 761               instrName = "j";
 762               is_linked = 0;
 763             }
 764         }
 765       condCodeIsPartOfName = 1;
 766       decodingClass = ((state->_opcode == op_JC) ? 4 : 3);
 767       state->isBranch = 1;
 768       break;
 769
 770     case op_ADD:
 771     case op_ADC:
 772     case op_AND:
 773       repeatsOp = (FIELDC (state->words[0]) == FIELDB (state->words[0]));
 774       decodingClass = 0;
 775
 776       switch (state->_opcode)
 777         {
 778         case op_ADD:
 779           instrName = (repeatsOp ? "asl" : "add");
 780           break;
 781         case op_ADC:
 782           instrName = (repeatsOp ? "rlc" : "adc");
 783           break;
 784         case op_AND:
 785           instrName = (repeatsOp ? "mov" : "and");
 786           break;
 787         }
 788       break;
 789
 790     case op_SUB: instrName = "sub";
 791       break;
 792     case op_SBC: instrName = "sbc";
 793       break;
 794     case op_OR:  instrName = "or";
 795       break;
 796     case op_BIC: instrName = "bic";
 797       break;
 798
 799     case op_XOR:
 800       if (state->words[0] == 0x7fffffff)
 801         {
 802           /* nop encoded as xor -1, -1, -1  */
 803           instrName = "nop";
 804           decodingClass = 9;
 805         }
 806       else
 807         instrName = "xor";
 808       break;
 809
 810     default:
 811       instrName = instruction_name (state,state->_opcode,0,&flags);
 812       /* if (instrName) printf("FLAGS=0x%x\n", flags);  */
 813       if (!instrName)
 814         {
 815           instrName = "???";
 816           state->flow=invalid_instr;
 817         }
 818       if (flags & IGNORE_FIRST_OPD)
 819         ignoreFirstOpd = 1;
 820       break;
 821     }
 822
 823   fieldAisReg = fieldBisReg = fieldCisReg = 1; /* Assume regs for now.  */
 824   flag = cond = is_shimm = is_limm = 0;
 825   state->nullifyMode = BR_exec_when_no_jump;    /* 0  */
 826   signExtend = addrWriteBack = directMem = 0;
 827   usesAuxReg = 0;
 828
 829   switch (decodingClass)
 830     {
 831     case 0:
 832       CHECK_FIELD_A ();
 833       CHECK_FIELD_B ();
 834       if (!repeatsOp)
 835         CHECK_FIELD_C ();
 836       CHECK_FLAG_COND_NULLIFY ();
 837
 838       write_instr_name ();
 839       if (!ignoreFirstOpd)
 840         {
 841           WRITE_FORMAT_x (A);
 842           WRITE_FORMAT_COMMA_x (B);
 843           if (!repeatsOp)
 844             WRITE_FORMAT_COMMA_x (C);
 845           WRITE_NOP_COMMENT ();
 846           my_sprintf (state, state->operandBuffer, formatString,
 847                       fieldA, fieldB, fieldC);
 848         }
 849       else
 850         {
 851           WRITE_FORMAT_x (B);
 852           if (!repeatsOp)
 853             WRITE_FORMAT_COMMA_x (C);
 854           my_sprintf (state, state->operandBuffer, formatString,
 855                       fieldB, fieldC);
 856         }
 857       write_comments ();
 858       break;
 859
 860     case 1:
 861       CHECK_FIELD_A ();
 862       CHECK_FIELD_B ();
 863       CHECK_FLAG_COND_NULLIFY ();
 864
 865       write_instr_name ();
 866       if (!ignoreFirstOpd)
 867         {
 868           WRITE_FORMAT_x (A);
 869           WRITE_FORMAT_COMMA_x (B);
 870           WRITE_NOP_COMMENT ();
 871           my_sprintf (state, state->operandBuffer, formatString,
 872                       fieldA, fieldB);
 873         }
 874       else
 875         {
 876           WRITE_FORMAT_x (B);
 877           my_sprintf (state, state->operandBuffer, formatString, fieldB);
 878         }
 879       write_comments ();
 880       break;
 881
 882     case 2:
 883       CHECK_FIELD_B ();
 884       CHECK_FLAG_COND_NULLIFY ();
 885       flag = 0; /* this is the FLAG instruction -- it's redundant  */
 886
 887       write_instr_name ();
 888       WRITE_FORMAT_x (B);
 889       my_sprintf (state, state->operandBuffer, formatString, fieldB);
 890       write_comments ();
 891       break;
 892
 893     case 3:
 894       fieldA = BITS (state->words[0],7,26) << 2;
 895       fieldA = (fieldA << 10) >> 10; /* make it signed  */
 896       fieldA += addr + 4;
 897       CHECK_FLAG_COND_NULLIFY ();
 898       flag = 0;
 899
 900       write_instr_name ();
 901       /* This address could be a label we know. Convert it.  */
 902       if (state->_opcode != op_LPC /* LP  */)
 903         {
 904           add_target (fieldA); /* For debugger.  */
 905           state->flow = state->_opcode == op_BLC /* BL  */
 906             ? direct_call
 907             : direct_jump;
 908           /* indirect calls are achieved by "lr blink,[status];
 909              lr dest<- func addr; j [dest]"  */
 910         }
 911
 912       strcat (formatString, "%s"); /* address/label name */
 913       my_sprintf (state, state->operandBuffer, formatString,
 914                   post_address (state, fieldA));
 915       write_comments ();
 916       break;
 917
 918     case 4:
 919       /* For op_JC -- jump to address specified.
 920          Also covers jump and link--bit 9 of the instr. word
 921          selects whether linked, thus "is_linked" is set above.  */
 922       fieldA = 0;
 923       CHECK_FIELD_B ();
 924       CHECK_FLAG_COND_NULLIFY ();
 925
 926       if (!fieldBisReg)
 927         {
 928           fieldAisReg = 0;
 929           fieldA = (fieldB >> 25) & 0x7F; /* flags */
 930           fieldB = (fieldB & 0xFFFFFF) << 2;
 931           state->flow = is_linked ? direct_call : direct_jump;
 932           add_target (fieldB);
 933           /* screwy JLcc requires .jd mode to execute correctly
 934            * but we pretend it is .nd (no delay slot).  */
 935           if (is_linked && state->nullifyMode == BR_exec_when_jump)
 936             state->nullifyMode = BR_exec_when_no_jump;
 937         }
 938       else
 939         {
 940           state->flow = is_linked ? indirect_call : indirect_jump;
 941           /* We should also treat this as indirect call if NOT linked
 942            * but the preceding instruction was a "lr blink,[status]"
 943            * and we have a delay slot with "add blink,blink,2".
 944            * For now we can't detect such.  */
 945           state->register_for_indirect_jump = fieldB;
 946         }
 947
 948       write_instr_name ();
 949       strcat (formatString,
 950               IS_REG (B) ? "[%r]" : "%s"); /* address/label name  */
 951       if (fieldA != 0)
 952         {
 953           fieldAisReg = 0;
 954           WRITE_FORMAT_COMMA_x (A);
 955         }
 956       if (IS_REG (B))
 957         my_sprintf (state, state->operandBuffer, formatString, fieldB, fieldA);
 958       else
 959         my_sprintf (state, state->operandBuffer, formatString,
 960                     post_address (state, fieldB), fieldA);
 961       write_comments ();
 962       break;
 963
 964     case 5:
 965       /* LD instruction.
 966          B and C can be regs, or one (both?) can be limm.  */
 967       CHECK_FIELD_A ();
 968       CHECK_FIELD_B ();
 969       CHECK_FIELD_C ();
 970       if (dbg)
 971         printf ("5:b reg %d %d c reg %d %d  \n",
 972                 fieldBisReg,fieldB,fieldCisReg,fieldC);
 973       state->_offset = 0;
 974       state->_ea_present = 1;
 975       if (fieldBisReg)
 976         state->ea_reg1 = fieldB;
 977       else
 978         state->_offset += fieldB;
 979       if (fieldCisReg)
 980         state->ea_reg2 = fieldC;
 981       else
 982         state->_offset += fieldC;
 983       state->_mem_load = 1;
 984
 985       directMem     = BIT (state->words[0],5);
 986       addrWriteBack = BIT (state->words[0],3);
 987       signExtend    = BIT (state->words[0],0);
 988
 989       write_instr_name ();
 990       WRITE_FORMAT_x_COMMA_LB(A);
 991       if (fieldBisReg || fieldB != 0)
 992         WRITE_FORMAT_x_COMMA (B);
 993       else
 994         fieldB = fieldC;
 995
 996       WRITE_FORMAT_x_RB (C);
 997       my_sprintf (state, state->operandBuffer, formatString,
 998                   fieldA, fieldB, fieldC);
 999       write_comments ();
1000       break;
1001
1002     case 6:
1003       /* LD instruction.  */
1004       CHECK_FIELD_B ();
1005       CHECK_FIELD_A ();
1006       fieldC = FIELDD (state->words[0]);
1007
1008       if (dbg)
1009         printf ("6:b reg %d %d c 0x%x  \n",
1010                 fieldBisReg, fieldB, fieldC);
1011       state->_ea_present = 1;
1012       state->_offset = fieldC;
1013       state->_mem_load = 1;
1014       if (fieldBisReg)
1015         state->ea_reg1 = fieldB;
1016       /* field B is either a shimm (same as fieldC) or limm (different!)
1017          Say ea is not present, so only one of us will do the name lookup.  */
1018       else
1019         state->_offset += fieldB, state->_ea_present = 0;
1020
1021       directMem     = BIT (state->words[0],14);
1022       addrWriteBack = BIT (state->words[0],12);
1023       signExtend    = BIT (state->words[0],9);
1024
1025       write_instr_name ();
1026       WRITE_FORMAT_x_COMMA_LB (A);
1027       if (!fieldBisReg)
1028         {
1029           fieldB = state->_offset;
1030           WRITE_FORMAT_x_RB (B);
1031         }
1032       else
1033         {
1034           WRITE_FORMAT_x (B);
1035           if (fieldC != 0 && !BIT (state->words[0],13))
1036             {
1037               fieldCisReg = 0;
1038               WRITE_FORMAT_COMMA_x_RB (C);
1039             }
1040           else
1041             WRITE_FORMAT_RB ();
1042         }
1043       my_sprintf (state, state->operandBuffer, formatString,
1044                   fieldA, fieldB, fieldC);
1045       write_comments ();
1046       break;
1047
1048     case 7:
1049       /* ST instruction.  */
1050       CHECK_FIELD_B();
1051       CHECK_FIELD_C();
1052       fieldA = FIELDD(state->words[0]); /* shimm  */
1053
1054       /* [B,A offset]  */
1055       if (dbg) printf("7:b reg %d %x off %x\n",
1056                       fieldBisReg,fieldB,fieldA);
1057       state->_ea_present = 1;
1058       state->_offset = fieldA;
1059       if (fieldBisReg)
1060         state->ea_reg1 = fieldB;
1061       /* field B is either a shimm (same as fieldA) or limm (different!)
1062          Say ea is not present, so only one of us will do the name lookup.
1063          (for is_limm we do the name translation here).  */
1064       else
1065         state->_offset += fieldB, state->_ea_present = 0;
1066
1067       directMem     = BIT(state->words[0],26);
1068       addrWriteBack = BIT(state->words[0],24);
1069
1070       write_instr_name();
1071       WRITE_FORMAT_x_COMMA_LB(C);
1072
1073       if (!fieldBisReg)
1074         {
1075           fieldB = state->_offset;
1076           WRITE_FORMAT_x_RB(B);
1077         }
1078       else
1079         {
1080           WRITE_FORMAT_x(B);
1081           if (fieldBisReg && fieldA != 0)
1082             {
1083               fieldAisReg = 0;
1084               WRITE_FORMAT_COMMA_x_RB(A);
1085             }
1086           else
1087             WRITE_FORMAT_RB();
1088         }
1089       my_sprintf (state, state->operandBuffer, formatString,
1090                   fieldC, fieldB, fieldA);
1091       write_comments2(fieldA);
1092       break;
1093     case 8:
1094       /* SR instruction  */
1095       CHECK_FIELD_B();
1096       CHECK_FIELD_C();
1097
1098       write_instr_name();
1099       WRITE_FORMAT_x_COMMA_LB(C);
1100       /* Try to print B as an aux reg if it is not a core reg.  */
1101       usesAuxReg = 1;
1102       WRITE_FORMAT_x(B);
1103       WRITE_FORMAT_RB();
1104       my_sprintf (state, state->operandBuffer, formatString, fieldC, fieldB);
1105       write_comments();
1106       break;
1107
1108     case 9:
1109       write_instr_name();
1110       state->operandBuffer[0] = '\0';
1111       break;
1112
1113     case 10:
1114       /* LR instruction */
1115       CHECK_FIELD_A();
1116       CHECK_FIELD_B();
1117
1118       write_instr_name();
1119       WRITE_FORMAT_x_COMMA_LB(A);
1120       /* Try to print B as an aux reg if it is not a core reg. */
1121       usesAuxReg = 1;
1122       WRITE_FORMAT_x(B);
1123       WRITE_FORMAT_RB();
1124       my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB);
1125       write_comments();
1126       break;
1127
1128     case 11:
1129       CHECK_COND();
1130       write_instr_name();
1131       state->operandBuffer[0] = '\0';
1132       break;
1133
1134     default:
1135       mwerror (state, "Bad decoding class in ARC disassembler");
1136       break;
1137     }
1138
1139   state->_cond = cond;
1140   return state->instructionLen = offset;
1141 }
1142
1143
1144 /* Returns the name the user specified core extension register.  */
1145 static const char *
1146 _coreRegName(arg, regval)
1147      void * arg ATTRIBUTE_UNUSED;
1148      int regval;
1149 {
1150   return arcExtMap_coreRegName (regval);
1151 }
1152
1153 /* Returns the name the user specified AUX extension register.  */
1154 static const char *
1155 _auxRegName(void *_this ATTRIBUTE_UNUSED, int regval)
1156 {
1157   return arcExtMap_auxRegName(regval);
1158 }
1159
1160
1161 /* Returns the name the user specified condition code name.  */
1162 static const char *
1163 _condCodeName(void *_this ATTRIBUTE_UNUSED, int regval)
1164 {
1165   return arcExtMap_condCodeName(regval);
1166 }
1167
1168 /* Returns the name the user specified extension instruction.  */
1169 static const char *
1170 _instName (void *_this ATTRIBUTE_UNUSED, int majop, int minop, int *flags)
1171 {
1172   return arcExtMap_instName(majop, minop, flags);
1173 }
1174
1175 /* Decode an instruction returning the size of the instruction
1176    in bytes or zero if unrecognized.  */
1177 static int
1178 decodeInstr (address, info)
1179      bfd_vma            address; /* Address of this instruction.  */
1180      disassemble_info * info;
1181 {
1182   int status;
1183   bfd_byte buffer[4];
1184   struct arcDisState s; /* ARC Disassembler state  */
1185   void *stream = info->stream; /* output stream  */
1186   fprintf_ftype func = info->fprintf_func;
1187   int bytes;
1188
1189   memset (&s, 0, sizeof(struct arcDisState));
1190
1191   /* read first instruction  */
1192   status = (*info->read_memory_func) (address, buffer, 4, info);
1193   if (status != 0)
1194     {
1195       (*info->memory_error_func) (status, address, info);
1196       return 0;
1197     }
1198   if (info->endian == BFD_ENDIAN_LITTLE)
1199     s.words[0] = bfd_getl32(buffer);
1200   else
1201     s.words[0] = bfd_getb32(buffer);
1202   /* always read second word in case of limm  */
1203
1204   /* we ignore the result since last insn may not have a limm  */
1205   status = (*info->read_memory_func) (address + 4, buffer, 4, info);
1206   if (info->endian == BFD_ENDIAN_LITTLE)
1207     s.words[1] = bfd_getl32(buffer);
1208   else
1209     s.words[1] = bfd_getb32(buffer);
1210
1211   s._this = &s;
1212   s.coreRegName = _coreRegName;
1213   s.auxRegName = _auxRegName;
1214   s.condCodeName = _condCodeName;
1215   s.instName = _instName;
1216
1217   /* disassemble  */
1218   bytes = dsmOneArcInst(address, (void *)&s);
1219
1220   /* display the disassembly instruction  */
1221   (*func) (stream, "%08x ", s.words[0]);
1222   (*func) (stream, "    ");
1223
1224   (*func) (stream, "%-10s ", s.instrBuffer);
1225
1226   if (__TRANSLATION_REQUIRED(s))
1227     {
1228       bfd_vma addr = s.addresses[s.operandBuffer[1] - '0'];
1229       (*info->print_address_func) ((bfd_vma) addr, info);
1230       (*func) (stream, "\n");
1231     }
1232   else
1233     (*func) (stream, "%s",s.operandBuffer);
1234   return s.instructionLen;
1235 }
1236
1237 /* Return the print_insn function to use.
1238    Side effect: load (possibly empty) extension section  */
1239
1240 disassembler_ftype
1241 arc_get_disassembler (void *ptr)
1242 {
1243   if (ptr)
1244     build_ARC_extmap (ptr);
1245   return decodeInstr;
1246 }