Shamusworld >> Repos - rmac/blob - risca.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // RISCA.C - GPU/DSP Assembler
   4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source Utilised with the Kind Permission of Landon Dyer
   7 //
   8
   9 #include "risca.h"
  10 #include "error.h"
  11 #include "sect.h"
  12 #include "token.h"
  13 #include "expr.h"
  14 #include "direct.h"
  15 #include "mark.h"
  16 #include "amode.h"
  17
  18 #define DEF_MR                          // Declar keyword values
  19 #include "risckw.h"                     // Incl generated risc keywords
  20
  21 #define DEF_KW                          // Declare keyword values
  22 #include "kwtab.h"                      // Incl generated keyword tables & defs
  23
  24
  25 unsigned altbankok = 0;         // Ok to use alternate register bank
  26 unsigned orgactive = 0;         // RISC org directive active
  27 unsigned orgaddr = 0;           // Org'd address
  28 unsigned orgwarning = 0;        // Has an ORG warning been issued
  29
  30 char reg_err[] = "missing register R0...R31";
  31
  32 // Jaguar Jump Condition Names
  33 char condname[MAXINTERNCC][5] = {
  34         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  35         "N", "N_NZ", "N_Z ", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  36         "PL", "MI", "F"
  37 };
  38
  39 // Jaguar Jump Condition Numbers
  40 char condnumber[] = {
  41         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  42         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  43 };
  44
  45 struct opcoderecord roptbl[] = {
  46         { MR_ADD,     RI_TWO,    0 },
  47         { MR_ADDC,    RI_TWO,    1 },
  48         { MR_ADDQ,    RI_NUM_32, 2 },
  49         { MR_ADDQT,   RI_NUM_32, 3 },
  50         { MR_SUB,     RI_TWO,    4 },
  51         { MR_SUBC,    RI_TWO,    5 },
  52         { MR_SUBQ,    RI_NUM_32, 6 },
  53         { MR_SUBQT,   RI_NUM_32, 7 },
  54         { MR_NEG,     RI_ONE,    8 },
  55         { MR_AND,     RI_TWO,    9 },
  56         { MR_OR,      RI_TWO,    10 },
  57         { MR_XOR,     RI_TWO,    11 },
  58         { MR_NOT,     RI_ONE,    12 },
  59         { MR_BTST,    RI_NUM_31, 13 },
  60         { MR_BSET,    RI_NUM_31, 14 },
  61         { MR_BCLR,    RI_NUM_31, 15 },
  62         { MR_MULT,    RI_TWO,    16 },
  63         { MR_IMULT,   RI_TWO,    17 },
  64         { MR_IMULTN,  RI_TWO,    18 },
  65         { MR_RESMAC,  RI_ONE,    19 },
  66         { MR_IMACN,   RI_TWO,    20 },
  67         { MR_DIV,     RI_TWO,    21 },
  68         { MR_ABS,     RI_ONE,    22 },
  69         { MR_SH,      RI_TWO,    23 },
  70         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  71         { MR_SHRQ,    RI_NUM_32, 25 },
  72         { MR_SHA,     RI_TWO,    26 },
  73         { MR_SHARQ,   RI_NUM_32, 27 },
  74         { MR_ROR,     RI_TWO,    28 },
  75         { MR_RORQ,    RI_NUM_32, 29 },
  76         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  77         { MR_CMP,     RI_TWO,    30 },
  78         { MR_CMPQ,    RI_NUM_15, 31 },
  79         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  80         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  81         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  82         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  83         { MR_MOVEQ,   RI_NUM_31, 35 },
  84         { MR_MOVETA,  RI_TWO,    36 },
  85         { MR_MOVEFA,  RI_TWO,    37 },
  86         { MR_MOVEI,   RI_MOVEI,  38 },
  87         { MR_LOADB,   RI_LOADN,  39 },
  88         { MR_LOADW,   RI_LOADN,  40 },
  89         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  90         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  91         { MR_STOREB,  RI_STOREN, 45 },
  92         { MR_STOREW,  RI_STOREN, 46 },
  93         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  94         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  95         { MR_JUMP,    RI_JUMP,   52 },
  96         { MR_JR,      RI_JR,     53 },
  97         { MR_MMULT,   RI_TWO,    54 },
  98         { MR_MTOI,    RI_TWO,    55 },
  99         { MR_NORMI,   RI_TWO,    56 },
 100         { MR_NOP,     RI_NONE,   57 },
 101         { MR_SAT24,   RI_ONE,    62 },
 102         { MR_UNPACK,  RI_ONE,    63 + GPUONLY },
 103         { MR_PACK,    RI_ONE,    63 + GPUONLY },
 104         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 105         { MR_MOVE,    RI_MOVE,   0 },
 106         { MR_LOAD,    RI_LOAD,   0 },
 107         { MR_STORE,   RI_STORE,  0 }
 108 };
 109
 110
 111 //
 112 // Convert a String to Uppercase
 113 //
 114 void strtoupper(char * s)
 115 {
 116 #if 0
 117         while (*s)
 118         {
 119                 *s = (char)(toupper(*s));
 120                 s++;
 121         }
 122 #else
 123         while (*s)
 124                 *s++ &= 0xDF;
 125 #endif
 126 }
 127
 128
 129 //
 130 // Function to return "malformed expression" error
 131 // This is done mainly to remove a bunch of GOTO statements in the parser
 132 //
 133 static inline int MalformedOpcode(void)
 134 {
 135         error("Malformed opcode");
 136         return ERROR;
 137 }
 138
 139
 140 //
 141 // Build RISC Instruction Word
 142 //
 143 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 144 {
 145         // Check for absolute address setting
 146         if (!orgwarning && !orgactive)
 147         {
 148                 warn("GPU/DSP code outside of absolute section");
 149                 orgwarning = 1;
 150         }
 151
 152         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 153         D_word(value);
 154 }
 155
 156
 157 //
 158 // Get a RISC Register
 159 //
 160 int GetRegister(WORD rattr)
 161 {
 162         VALUE eval;                                     // Expression value
 163         WORD eattr;                                     // Expression attributes
 164         SYM * esym;                                     // External symbol involved in expr.
 165         TOKEN r_expr[EXPRSIZE];         // Expression token list
 166
 167         // Evaluate what's in the global "tok" buffer
 168         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 169                 return MalformedOpcode();
 170
 171         if ((challoc - ch_size) < 4)
 172                 chcheck(4L);
 173
 174         if (!(eattr & DEFINED))
 175         {
 176                 fixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 177                 return 0;
 178         }
 179
 180         // If we got a register in range (0-31), return it
 181         if ((eval >= 0) && (eval <= 31))
 182                 return eval;
 183
 184         // Otherwise, it's out of range & we flag an error
 185         error(reg_err);
 186         return ERROR;
 187 }
 188
 189
 190 //
 191 // Do RISC Code Generation
 192 //
 193 int GenerateRISCCode(int state)
 194 {
 195         int reg1;                                       // Register 1
 196         int reg2;                                       // Register 2
 197         int val = 0;                            // Constructed value
 198         char scratch[80];
 199         SYM * ccsym;
 200         SYM * sy;
 201         int i, commaFound;
 202         TOKEN * t;
 203         WORD tdb;
 204         WORD attrflg;
 205         int indexed;                            // Indexed register flag
 206
 207         VALUE eval;                                     // Expression value
 208         WORD eattr;                                     // Expression attributes
 209         SYM * esym;                                     // External symbol involved in expr.
 210         TOKEN r_expr[EXPRSIZE];         // Expression token list
 211
 212         // Get opcode parameter and type
 213         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 214         unsigned type = roptbl[state - 3000].typ;
 215
 216         // Detect whether the opcode parmeter passed determines that the opcode is
 217         // specific to only one of the RISC processors and ensure it is legal in
 218         // the current code section. If not then show error and return.
 219         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 220         {
 221                 error("Opcode is not valid in this code section");
 222                 return ERROR;
 223         }
 224
 225         // Process RISC opcode
 226         switch (type)
 227         {
 228         // No operand instructions
 229         // NOP
 230         case RI_NONE:
 231                 BuildRISCIntructionWord(parm, 0, 0);
 232                 break;
 233
 234         // Single operand instructions (Rd)
 235         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S, UNPACK
 236         case RI_ONE:
 237                 reg2 = GetRegister(FU_REGTWO);
 238                 at_eol();
 239                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 240                 break;
 241
 242         // Two operand instructions (Rs,Rd)
 243         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT, MMULT,
 244         // MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 245         case RI_TWO:
 246                 if (parm == 37)
 247                         altbankok = 1;                      // MOVEFA
 248
 249                 reg1 = GetRegister(FU_REGONE);
 250                 CHECK_COMMA;
 251
 252                 if (parm == 36)
 253                         altbankok = 1;                      // MOVETA
 254
 255                 reg2 = GetRegister(FU_REGTWO);
 256                 at_eol();
 257                 BuildRISCIntructionWord(parm, reg1, reg2);
 258                 break;
 259
 260         // Numeric operand (n,Rd) where n = -16..+15
 261         // CMPQ
 262         case RI_NUM_15:
 263
 264         // Numeric operand (n,Rd) where n = 0..31
 265         // BCLR, BSET, BTST, MOVEQ
 266         case RI_NUM_31:
 267
 268         // Numeric operand (n,Rd) where n = 1..32
 269         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ, RORQ
 270         case RI_NUM_32:
 271                 switch (type)
 272                 {
 273                 case RI_NUM_15:
 274                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 275                         break;
 276                 default:
 277                 case RI_NUM_31:
 278                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 279                         break;
 280                 case RI_NUM_32:
 281                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 282                         break;
 283                 }
 284
 285                 if (parm & SUB32)
 286                         attrflg |= FU_SUB32;
 287
 288                 if (*tok != '#')
 289                         return MalformedOpcode();
 290
 291                 tok++;
 292
 293                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 294                         return MalformedOpcode();
 295
 296                 if ((challoc - ch_size) < 4)
 297                         chcheck(4L);
 298
 299                 if (!(eattr & DEFINED))
 300                 {
 301                         fixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 302                         reg1 = 0;
 303                 }
 304                 else
 305                 {
 306                         if ((int)eval < reg1 || (int)eval > reg2)
 307                         {
 308                                 error("constant out of range");
 309                                 return ERROR;
 310                         }
 311
 312                         if (parm & SUB32)
 313                                 reg1 = 32 - eval;
 314                         else if (type == RI_NUM_32)
 315                                 reg1 = (reg1 == 32 ? 0 : eval);
 316                         else
 317                                 reg1 = eval;
 318                 }
 319
 320                 CHECK_COMMA;
 321                 reg2 = GetRegister(FU_REGTWO);
 322                 at_eol();
 323                 BuildRISCIntructionWord(parm, reg1, reg2);
 324                 break;
 325
 326         // Move Immediate--n,Rn--n in Second Word
 327         case RI_MOVEI:
 328                 if (*tok != '#')
 329                         return MalformedOpcode();
 330
 331                 tok++;
 332
 333                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 334                         return MalformedOpcode();
 335
 336                 if ((challoc - ch_size) < 4)
 337                         chcheck(4L);
 338
 339                 if (!(eattr & DEFINED))
 340                 {
 341                         fixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 342                         eval = 0;
 343                 }
 344                 else
 345                 {
 346                         if (eattr & TDB)
 347                                 rmark(cursect, sloc + 2, tdb, MLONG | MMOVEI, NULL);
 348                 }
 349
 350 //              val = eval;
 351                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 352 //              tok++;  // assuming a comma here? tsk tsk
 353                 CHECK_COMMA;
 354                 reg2 = GetRegister(FU_REGTWO);
 355                 at_eol();
 356                 D_word((((parm & 0x3F) << 10) + reg2));
 357                 D_long(val);
 358                 break;
 359
 360         // PC,Rd or Rs,Rd
 361         case RI_MOVE:
 362                 if (*tok == KW_PC)
 363                 {
 364                         parm = 51;
 365                         reg1 = 0;
 366                         tok++;
 367                 }
 368                 else
 369                 {
 370                         parm = 34;
 371                         reg1 = GetRegister(FU_REGONE);
 372                 }
 373
 374                 CHECK_COMMA;
 375                 reg2 = GetRegister(FU_REGTWO);
 376                 at_eol();
 377                 BuildRISCIntructionWord(parm, reg1, reg2);
 378                 break;
 379
 380         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 381         case RI_LOAD:
 382                 indexed = 0;
 383                 parm = 41;
 384
 385                 if (*tok != '(')
 386                         return MalformedOpcode();
 387
 388                 tok++;
 389
 390                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 391                         indexed = (*tok - KW_R0);
 392
 393                 if (*tok == SYMBOL)
 394                 {
 395 //                      sy = lookup((char *)tok[1], LABEL, 0);
 396                         sy = lookup(string[tok[1]], LABEL, 0);
 397
 398                         if (!sy)
 399                         {
 400                                 error(reg_err);
 401                                 return ERROR;
 402                         }
 403
 404                         if (sy->sattre & EQUATEDREG)
 405                         {
 406                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 407                                         && (*(tok + 2) != ')'))
 408                                 {
 409                                         indexed = (sy->svalue & 0x1F);
 410                                         tok++;
 411                                 }
 412                         }
 413                 }
 414
 415                 if (!indexed)
 416                 {
 417                         reg1 = GetRegister(FU_REGONE);
 418                 }
 419                 else
 420                 {
 421                         reg1 = indexed;
 422                         indexed = 0;
 423                         tok++;
 424
 425                         if (*tok == '+')
 426                         {
 427                                 parm = (WORD)(reg1 - 14 + 58);
 428                                 tok++;
 429
 430                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 431                                         indexed = 1;
 432
 433                                 if (*tok == SYMBOL)
 434                                 {
 435 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 436                                         sy = lookup(string[tok[1]], LABEL, 0);
 437
 438                                         if (!sy)
 439                                         {
 440                                                 error(reg_err);
 441                                                 return ERROR;
 442                                         }
 443
 444                                         if (sy->sattre & EQUATEDREG)
 445                                                 indexed = 1;
 446                                 }
 447
 448                                 if (indexed)
 449                                 {
 450                                         reg1 = GetRegister(FU_REGONE);
 451                                 }
 452                                 else
 453                                 {
 454                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 455                                                 return MalformedOpcode();
 456
 457                                         if ((challoc - ch_size) < 4)
 458                                                 chcheck(4L);
 459
 460                                         if (!(eattr & DEFINED))
 461                                         {
 462                                                 error("constant expected");
 463                                                 return ERROR;
 464                                         }
 465
 466                                         reg1 = eval;
 467
 468                                         if (reg1 == 0)
 469                                         {
 470                                                 reg1 = 14 + (parm - 58);
 471                                                 parm = 41;
 472                                                 warn("NULL offset removed");
 473                                         }
 474                                         else
 475                                         {
 476                                                 if (reg1 < 1 || reg1 > 32)
 477                                                 {
 478                                                         error("constant out of range");
 479                                                         return ERROR;
 480                                                 }
 481
 482                                                 if (reg1 == 32)
 483                                                         reg1 = 0;
 484
 485                                                 parm = (WORD)(parm - 58 + 43);
 486                                         }
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 reg1 = GetRegister(FU_REGONE);
 492                         }
 493                 }
 494
 495                 if (*tok != ')')
 496                         return MalformedOpcode();
 497
 498                 tok++;
 499                 CHECK_COMMA;
 500                 reg2 = GetRegister(FU_REGTWO);
 501                 at_eol();
 502                 BuildRISCIntructionWord(parm, reg1, reg2);
 503                 break;
 504
 505         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 506         case RI_STORE:
 507                 parm = 47;
 508                 reg1 = GetRegister(FU_REGONE);
 509                 CHECK_COMMA;
 510
 511                 if (*tok != '(')
 512                         return MalformedOpcode();
 513
 514                 tok++;
 515                 indexed = 0;
 516
 517                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 518                         indexed = (*tok - KW_R0);
 519
 520                 if (*tok == SYMBOL)
 521                 {
 522 //                      sy = lookup((char *)tok[1], LABEL, 0);
 523                         sy = lookup(string[tok[1]], LABEL, 0);
 524
 525                         if (!sy)
 526                         {
 527                                 error(reg_err);
 528                                 return ERROR;
 529                         }
 530
 531                         if (sy->sattre & EQUATEDREG)
 532                         {
 533                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 534                                         && (*(tok + 2) != ')'))
 535                                 {
 536                                         indexed = (sy->svalue & 0x1F);
 537                                         tok++;
 538                                 }
 539                         }
 540                 }
 541
 542                 if (!indexed)
 543                 {
 544                         reg2 = GetRegister(FU_REGTWO);
 545                 }
 546                 else
 547                 {
 548                         reg2 = indexed;
 549                         indexed = 0;
 550                         tok++;
 551
 552                         if (*tok == '+')
 553                         {
 554                                 parm = (WORD)(reg2 - 14 + 60);
 555                                 tok++;
 556
 557                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 558                                         indexed = 1;
 559
 560                                 if (*tok == SYMBOL)
 561                                 {
 562 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 563                                         sy = lookup(string[tok[1]], LABEL, 0);
 564
 565                                         if (!sy)
 566                                         {
 567                                                 error(reg_err);
 568                                                 return ERROR;
 569                                         }
 570
 571                                         if (sy->sattre & EQUATEDREG)
 572                                                 indexed = 1;
 573                                 }
 574
 575                                 if (indexed)
 576                                 {
 577                                         reg2 = GetRegister(FU_REGTWO);
 578                                 }
 579                                 else
 580                                 {
 581                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 582                                                 return MalformedOpcode();
 583
 584                                         if ((challoc - ch_size) < 4)
 585                                                 chcheck(4L);
 586
 587                                         if (!(eattr & DEFINED))
 588                                         {
 589                                                 fixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 590                                                 reg2 = 0;
 591                                         }
 592                                         else
 593                                         {
 594                                                 reg2 = eval;
 595
 596                                                 if (reg2 == 0)
 597                                                 {
 598                                                         reg2 = 14 + (parm - 60);
 599                                                         parm = 47;
 600                                                         warn("NULL offset removed");
 601                                                 }
 602                                                 else
 603                                                 {
 604                                                         if (reg2 < 1 || reg2 > 32)
 605                                                         {
 606                                                                 error("constant out of range");
 607                                                                 return ERROR;
 608                                                         }
 609
 610                                                         if (reg2 == 32)
 611                                                                 reg2 = 0;
 612
 613                                                         parm = (WORD)(parm - 60 + 49);
 614                                                 }
 615                                         }
 616                                 }
 617                         }
 618                         else
 619                         {
 620                                 reg2 = GetRegister(FU_REGTWO);
 621                         }
 622                 }
 623
 624                 if (*tok != ')')
 625                         return MalformedOpcode();
 626
 627                 tok++;
 628                 at_eol();
 629                 BuildRISCIntructionWord(parm, reg2, reg1);
 630                 break;
 631
 632         // LOADB/LOADP/LOADW (Rn),Rn
 633         case RI_LOADN:
 634                 if (*tok != '(')
 635                         return MalformedOpcode();
 636
 637                 tok++;
 638                 reg1 = GetRegister(FU_REGONE);
 639
 640                 if (*tok != ')')
 641                         return MalformedOpcode();
 642
 643                 tok++;
 644                 CHECK_COMMA;
 645                 reg2 = GetRegister(FU_REGTWO);
 646                 at_eol();
 647                 BuildRISCIntructionWord(parm, reg1, reg2);
 648                 break;
 649
 650         // STOREB/STOREP/STOREW Rn,(Rn)
 651         case RI_STOREN:
 652                 reg1 = GetRegister(FU_REGONE);
 653                 CHECK_COMMA;
 654
 655                 if (*tok != '(')
 656                         return MalformedOpcode();
 657
 658                 tok++;
 659                 reg2 = GetRegister(FU_REGTWO);
 660
 661                 if (*tok != ')')
 662                         return MalformedOpcode();
 663
 664                 tok++;
 665                 at_eol();
 666                 BuildRISCIntructionWord(parm, reg2, reg1);
 667                 break;
 668
 669         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 670         case RI_JR:
 671
 672         // Jump Absolute - cc,(Rs) - reg2=cc
 673         case RI_JUMP:
 674                 // Check to see if there is a comma in the token string. If not then
 675                 // the JR or JUMP should default to 0, Jump Always
 676                 commaFound = 0;
 677
 678                 for(t=tok; *t!=EOL; t++)
 679                 {
 680                         if (*t == ',')
 681                         {
 682                                 commaFound = 1;
 683                                 break;
 684                         }
 685                 }
 686
 687                 if (commaFound)
 688                 {
 689                         if (*tok == CONST)
 690                         {
 691                                 // CC using a constant number
 692                                 tok++;
 693                                 val = *tok;
 694                                 tok++;
 695                                 CHECK_COMMA;
 696                         }
 697                         else if (*tok == SYMBOL)
 698                         {
 699                                 val = 99;
 700 //                              strcpy(scratch, (char *)tok[1]);
 701                                 strcpy(scratch, string[tok[1]]);
 702                                 strtoupper(scratch);
 703
 704                                 for(i=0; i<MAXINTERNCC; i++)
 705                                 {
 706                                         // Look for the condition code & break if found
 707                                         if (strcmp(condname[i], scratch) == 0)
 708                                         {
 709                                                 val = condnumber[i];
 710                                                 break;
 711                                         }
 712                                 }
 713
 714                                 // Standard CC was not found, look for an equated one
 715                                 if (val == 99)
 716                                 {
 717 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 718                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 719
 720                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 721                                         {
 722                                                 val = ccsym->svalue;
 723                                         }
 724                                         else
 725                                         {
 726                                                 error("unknown condition code");
 727                                                 return ERROR;
 728                                         }
 729                                 }
 730
 731                                 tok += 2;
 732                                 CHECK_COMMA;
 733                         }
 734                         else if (*tok == '(')
 735                         {
 736                                 // Set CC to "Jump Always"
 737                                 val = 0;
 738                         }
 739                 }
 740                 else
 741                 {
 742                         // Set CC to "Jump Always"
 743                         val = 0;
 744                 }
 745
 746                 if (val < 0 || val > 31)
 747                 {
 748                         error("condition constant out of range");
 749                         return ERROR;
 750                 }
 751
 752                 // Store condition code
 753                 reg1 = val;
 754
 755                 if (type == RI_JR)
 756                 {
 757                         // JR cc,n
 758                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 759                                 return MalformedOpcode();
 760
 761                         if ((challoc - ch_size) < 4)
 762                                 chcheck(4L);
 763
 764                         if (!(eattr & DEFINED))
 765                         {
 766                                 fixup(FU_WORD | FU_JR, sloc, r_expr);
 767                                 reg2 = 0;
 768                         }
 769                         else
 770                         {
 771 #if 0
 772                                 val = eval;
 773
 774                                 if (orgactive)
 775                                         reg2 = ((int)(val - (orgaddr + 2))) / 2;
 776                                 else
 777                                         reg2 = ((int)(val - (sloc + 2))) / 2;
 778 #else
 779                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 780 #endif
 781
 782                                 if ((reg2 < -16) || (reg2 > 15))
 783                                         error("PC relative overflow");
 784                         }
 785
 786                         BuildRISCIntructionWord(parm, reg2, reg1);
 787                 }
 788                 else
 789                 {
 790                         // JUMP cc, (Rn)
 791                         if (*tok != '(')
 792                                 return MalformedOpcode();
 793
 794                         tok++;
 795                         reg2 = GetRegister(FU_REGTWO);
 796
 797                         if (*tok != ')')
 798                                 return MalformedOpcode();
 799
 800                         tok++;
 801                         at_eol();
 802                         BuildRISCIntructionWord(parm, reg2, reg1);
 803                 }
 804
 805                 break;
 806
 807         // Should never get here :-D
 808         default:
 809                 error("Unknown risc opcode type");
 810                 return ERROR;
 811         }
 812
 813         return 0;
 814 }
 815