Shamusworld >> Repos - rmac/blob - riscasm.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 "riscasm.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(int signal)
 134 {
 135         char buf[16];
 136         sprintf(buf, "%02X", signal);
 137         errors("Malformed opcode [internal $%s]", buf);
 138         return ERROR;
 139 }
 140
 141
 142 //
 143 // Build RISC Instruction Word
 144 //
 145 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 146 {
 147         // Check for absolute address setting
 148         if (!orgwarning && !orgactive)
 149         {
 150                 warn("GPU/DSP code outside of absolute section");
 151                 orgwarning = 1;
 152         }
 153
 154         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 155         D_word(value);
 156 }
 157
 158
 159 //
 160 // Get a RISC Register
 161 //
 162 int GetRegister(WORD rattr)
 163 {
 164         VALUE eval;                                     // Expression value
 165         WORD eattr;                                     // Expression attributes
 166         SYM * esym;                                     // External symbol involved in expr.
 167         TOKEN r_expr[EXPRSIZE];         // Expression token list
 168
 169         // Evaluate what's in the global "tok" buffer
 170         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 171                 // Hmm, the evaluator should report the error to us...
 172 //              return MalformedOpcode(0x00);
 173                 return ERROR;
 174
 175         if ((challoc - ch_size) < 4)
 176                 chcheck(4L);
 177
 178         if (!(eattr & DEFINED))
 179         {
 180                 fixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 181                 return 0;
 182         }
 183
 184         // If we got a register in range (0-31), return it
 185         if ((eval >= 0) && (eval <= 31))
 186                 return eval;
 187
 188         // Otherwise, it's out of range & we flag an error
 189         error(reg_err);
 190         return ERROR;
 191 }
 192
 193
 194 //
 195 // Do RISC Code Generation
 196 //
 197 int GenerateRISCCode(int state)
 198 {
 199         int reg1;                                       // Register 1
 200         int reg2;                                       // Register 2
 201         int val = 0;                            // Constructed value
 202         char scratch[80];
 203         SYM * ccsym;
 204         SYM * sy;
 205         int i, commaFound;
 206         TOKEN * t;
 207         WORD attrflg;
 208         int indexed;                            // Indexed register flag
 209
 210         VALUE eval;                                     // Expression value
 211         WORD eattr;                                     // Expression attributes
 212         SYM * esym;                                     // External symbol involved in expr.
 213         TOKEN r_expr[EXPRSIZE];         // Expression token list
 214
 215         // Get opcode parameter and type
 216         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 217         unsigned type = roptbl[state - 3000].typ;
 218
 219         // Detect whether the opcode parmeter passed determines that the opcode is
 220         // specific to only one of the RISC processors and ensure it is legal in
 221         // the current code section. If not then show error and return.
 222         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 223         {
 224                 error("Opcode is not valid in this code section");
 225                 return ERROR;
 226         }
 227
 228         // Process RISC opcode
 229         switch (type)
 230         {
 231         // No operand instructions
 232         // NOP
 233         case RI_NONE:
 234                 BuildRISCIntructionWord(parm, 0, 0);
 235                 break;
 236
 237         // Single operand instructions (Rd)
 238         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S, UNPACK
 239         case RI_ONE:
 240                 reg2 = GetRegister(FU_REGTWO);
 241                 at_eol();
 242                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 243                 break;
 244
 245         // Two operand instructions (Rs,Rd)
 246         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT, MMULT,
 247         // MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 248         case RI_TWO:
 249                 if (parm == 37)
 250                         altbankok = 1;                      // MOVEFA
 251
 252                 reg1 = GetRegister(FU_REGONE);
 253                 CHECK_COMMA;
 254
 255                 if (parm == 36)
 256                         altbankok = 1;                      // MOVETA
 257
 258                 reg2 = GetRegister(FU_REGTWO);
 259                 at_eol();
 260                 BuildRISCIntructionWord(parm, reg1, reg2);
 261                 break;
 262
 263         // Numeric operand (n,Rd) where n = -16..+15
 264         // CMPQ
 265         case RI_NUM_15:
 266
 267         // Numeric operand (n,Rd) where n = 0..31
 268         // BCLR, BSET, BTST, MOVEQ
 269         case RI_NUM_31:
 270
 271         // Numeric operand (n,Rd) where n = 1..32
 272         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ, RORQ
 273         case RI_NUM_32:
 274                 switch (type)
 275                 {
 276                 case RI_NUM_15:
 277                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 278                         break;
 279                 default:
 280                 case RI_NUM_31:
 281                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 282                         break;
 283                 case RI_NUM_32:
 284                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 285                         break;
 286                 }
 287
 288                 if (parm & SUB32)
 289                         attrflg |= FU_SUB32;
 290
 291                 if (*tok != '#')
 292                         return MalformedOpcode(0x01);
 293
 294                 tok++;
 295
 296                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 297                         return MalformedOpcode(0x02);
 298
 299                 if ((challoc - ch_size) < 4)
 300                         chcheck(4L);
 301
 302                 if (!(eattr & DEFINED))
 303                 {
 304                         fixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 305                         reg1 = 0;
 306                 }
 307                 else
 308                 {
 309                         if ((int)eval < reg1 || (int)eval > reg2)
 310                         {
 311                                 error("constant out of range");
 312                                 return ERROR;
 313                         }
 314
 315                         if (parm & SUB32)
 316                                 reg1 = 32 - eval;
 317                         else if (type == RI_NUM_32)
 318                                 reg1 = (reg1 == 32 ? 0 : eval);
 319                         else
 320                                 reg1 = eval;
 321                 }
 322
 323                 CHECK_COMMA;
 324                 reg2 = GetRegister(FU_REGTWO);
 325                 at_eol();
 326                 BuildRISCIntructionWord(parm, reg1, reg2);
 327                 break;
 328
 329         // Move Immediate--n,Rn--n in Second Word
 330         case RI_MOVEI:
 331                 if (*tok != '#')
 332                         return MalformedOpcode(0x03);
 333
 334                 tok++;
 335
 336                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 337                         return MalformedOpcode(0x04);
 338
 339                 if ((challoc - ch_size) < 4)
 340                         chcheck(4L);
 341
 342                 if (!(eattr & DEFINED))
 343                 {
 344                         fixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 345                         eval = 0;
 346                 }
 347                 else
 348                 {
 349                         if (eattr & TDB)
 350 //{
 351 //printf("risca: Doing rmark for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 352                                 rmark(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 353 //}
 354                 }
 355
 356                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 357                 CHECK_COMMA;
 358                 reg2 = GetRegister(FU_REGTWO);
 359                 at_eol();
 360                 D_word((((parm & 0x3F) << 10) + reg2));
 361                 D_long(val);
 362                 break;
 363
 364         // PC,Rd or Rs,Rd
 365         case RI_MOVE:
 366                 if (*tok == KW_PC)
 367                 {
 368                         parm = 51;
 369                         reg1 = 0;
 370                         tok++;
 371                 }
 372                 else
 373                 {
 374                         parm = 34;
 375                         reg1 = GetRegister(FU_REGONE);
 376                 }
 377
 378                 CHECK_COMMA;
 379                 reg2 = GetRegister(FU_REGTWO);
 380                 at_eol();
 381                 BuildRISCIntructionWord(parm, reg1, reg2);
 382                 break;
 383
 384         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 385         case RI_LOAD:
 386                 indexed = 0;
 387                 parm = 41;
 388
 389                 if (*tok != '(')
 390                         return MalformedOpcode(0x05);
 391
 392                 tok++;
 393
 394                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 395                         indexed = (*tok - KW_R0);
 396
 397                 if (*tok == SYMBOL)
 398                 {
 399 //                      sy = lookup((char *)tok[1], LABEL, 0);
 400                         sy = lookup(string[tok[1]], LABEL, 0);
 401
 402                         if (!sy)
 403                         {
 404                                 error(reg_err);
 405                                 return ERROR;
 406                         }
 407
 408                         if (sy->sattre & EQUATEDREG)
 409                         {
 410                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 411                                         && (*(tok + 2) != ')'))
 412                                 {
 413                                         indexed = (sy->svalue & 0x1F);
 414                                         tok++;
 415                                 }
 416                         }
 417                 }
 418
 419                 if (!indexed)
 420                 {
 421                         reg1 = GetRegister(FU_REGONE);
 422                 }
 423                 else
 424                 {
 425                         reg1 = indexed;
 426                         indexed = 0;
 427                         tok++;
 428
 429                         if (*tok == '+')
 430                         {
 431                                 parm = (WORD)(reg1 - 14 + 58);
 432                                 tok++;
 433
 434                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 435                                         indexed = 1;
 436
 437                                 if (*tok == SYMBOL)
 438                                 {
 439 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 440                                         sy = lookup(string[tok[1]], LABEL, 0);
 441
 442                                         if (!sy)
 443                                         {
 444                                                 error(reg_err);
 445                                                 return ERROR;
 446                                         }
 447
 448                                         if (sy->sattre & EQUATEDREG)
 449                                                 indexed = 1;
 450                                 }
 451
 452                                 if (indexed)
 453                                 {
 454                                         reg1 = GetRegister(FU_REGONE);
 455                                 }
 456                                 else
 457                                 {
 458                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 459                                                 return MalformedOpcode(0x06);
 460
 461                                         if ((challoc - ch_size) < 4)
 462                                                 chcheck(4L);
 463
 464                                         if (!(eattr & DEFINED))
 465                                         {
 466                                                 error("constant expected");
 467                                                 return ERROR;
 468                                         }
 469
 470                                         reg1 = eval;
 471
 472                                         if (reg1 == 0)
 473                                         {
 474                                                 reg1 = 14 + (parm - 58);
 475                                                 parm = 41;
 476                                                 warn("NULL offset removed");
 477                                         }
 478                                         else
 479                                         {
 480                                                 if (reg1 < 1 || reg1 > 32)
 481                                                 {
 482                                                         error("constant out of range");
 483                                                         return ERROR;
 484                                                 }
 485
 486                                                 if (reg1 == 32)
 487                                                         reg1 = 0;
 488
 489                                                 parm = (WORD)(parm - 58 + 43);
 490                                         }
 491                                 }
 492                         }
 493                         else
 494                         {
 495                                 reg1 = GetRegister(FU_REGONE);
 496                         }
 497                 }
 498
 499                 if (*tok != ')')
 500                         return MalformedOpcode(0x07);
 501
 502                 tok++;
 503                 CHECK_COMMA;
 504                 reg2 = GetRegister(FU_REGTWO);
 505                 at_eol();
 506                 BuildRISCIntructionWord(parm, reg1, reg2);
 507                 break;
 508
 509         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 510         case RI_STORE:
 511                 parm = 47;
 512                 reg1 = GetRegister(FU_REGONE);
 513                 CHECK_COMMA;
 514
 515                 if (*tok != '(')
 516                         return MalformedOpcode(0x08);
 517
 518                 tok++;
 519                 indexed = 0;
 520
 521                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 522                         indexed = (*tok - KW_R0);
 523
 524                 if (*tok == SYMBOL)
 525                 {
 526 //                      sy = lookup((char *)tok[1], LABEL, 0);
 527                         sy = lookup(string[tok[1]], LABEL, 0);
 528
 529                         if (!sy)
 530                         {
 531                                 error(reg_err);
 532                                 return ERROR;
 533                         }
 534
 535                         if (sy->sattre & EQUATEDREG)
 536                         {
 537                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 538                                         && (*(tok + 2) != ')'))
 539                                 {
 540                                         indexed = (sy->svalue & 0x1F);
 541                                         tok++;
 542                                 }
 543                         }
 544                 }
 545
 546                 if (!indexed)
 547                 {
 548                         reg2 = GetRegister(FU_REGTWO);
 549                 }
 550                 else
 551                 {
 552                         reg2 = indexed;
 553                         indexed = 0;
 554                         tok++;
 555
 556                         if (*tok == '+')
 557                         {
 558                                 parm = (WORD)(reg2 - 14 + 60);
 559                                 tok++;
 560
 561                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 562                                         indexed = 1;
 563
 564                                 if (*tok == SYMBOL)
 565                                 {
 566 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 567                                         sy = lookup(string[tok[1]], LABEL, 0);
 568
 569                                         if (!sy)
 570                                         {
 571                                                 error(reg_err);
 572                                                 return ERROR;
 573                                         }
 574
 575                                         if (sy->sattre & EQUATEDREG)
 576                                                 indexed = 1;
 577                                 }
 578
 579                                 if (indexed)
 580                                 {
 581                                         reg2 = GetRegister(FU_REGTWO);
 582                                 }
 583                                 else
 584                                 {
 585                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 586                                                 return MalformedOpcode(0x09);
 587
 588                                         if ((challoc - ch_size) < 4)
 589                                                 chcheck(4L);
 590
 591                                         if (!(eattr & DEFINED))
 592                                         {
 593                                                 fixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 594                                                 reg2 = 0;
 595                                         }
 596                                         else
 597                                         {
 598                                                 reg2 = eval;
 599
 600                                                 if (reg2 == 0)
 601                                                 {
 602                                                         reg2 = 14 + (parm - 60);
 603                                                         parm = 47;
 604                                                         warn("NULL offset removed");
 605                                                 }
 606                                                 else
 607                                                 {
 608                                                         if (reg2 < 1 || reg2 > 32)
 609                                                         {
 610                                                                 error("constant out of range");
 611                                                                 return ERROR;
 612                                                         }
 613
 614                                                         if (reg2 == 32)
 615                                                                 reg2 = 0;
 616
 617                                                         parm = (WORD)(parm - 60 + 49);
 618                                                 }
 619                                         }
 620                                 }
 621                         }
 622                         else
 623                         {
 624                                 reg2 = GetRegister(FU_REGTWO);
 625                         }
 626                 }
 627
 628                 if (*tok != ')')
 629                         return MalformedOpcode(0x0A);
 630
 631                 tok++;
 632                 at_eol();
 633                 BuildRISCIntructionWord(parm, reg2, reg1);
 634                 break;
 635
 636         // LOADB/LOADP/LOADW (Rn),Rn
 637         case RI_LOADN:
 638                 if (*tok != '(')
 639                         return MalformedOpcode(0x0B);
 640
 641                 tok++;
 642                 reg1 = GetRegister(FU_REGONE);
 643
 644                 if (*tok != ')')
 645                         return MalformedOpcode(0x0C);
 646
 647                 tok++;
 648                 CHECK_COMMA;
 649                 reg2 = GetRegister(FU_REGTWO);
 650                 at_eol();
 651                 BuildRISCIntructionWord(parm, reg1, reg2);
 652                 break;
 653
 654         // STOREB/STOREP/STOREW Rn,(Rn)
 655         case RI_STOREN:
 656                 reg1 = GetRegister(FU_REGONE);
 657                 CHECK_COMMA;
 658
 659                 if (*tok != '(')
 660                         return MalformedOpcode(0x0D);
 661
 662                 tok++;
 663                 reg2 = GetRegister(FU_REGTWO);
 664
 665                 if (*tok != ')')
 666                         return MalformedOpcode(0x0E);
 667
 668                 tok++;
 669                 at_eol();
 670                 BuildRISCIntructionWord(parm, reg2, reg1);
 671                 break;
 672
 673         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 674         case RI_JR:
 675
 676         // Jump Absolute - cc,(Rs) - reg2=cc
 677         case RI_JUMP:
 678                 // Check to see if there is a comma in the token string. If not then
 679                 // the JR or JUMP should default to 0, Jump Always
 680                 commaFound = 0;
 681
 682                 for(t=tok; *t!=EOL; t++)
 683                 {
 684                         if (*t == ',')
 685                         {
 686                                 commaFound = 1;
 687                                 break;
 688                         }
 689                 }
 690
 691                 if (commaFound)
 692                 {
 693                         if (*tok == CONST)
 694                         {
 695                                 // CC using a constant number
 696                                 tok++;
 697                                 val = *tok;
 698                                 tok++;
 699                                 CHECK_COMMA;
 700                         }
 701                         else if (*tok == SYMBOL)
 702                         {
 703                                 val = 99;
 704 //                              strcpy(scratch, (char *)tok[1]);
 705                                 strcpy(scratch, string[tok[1]]);
 706                                 strtoupper(scratch);
 707
 708                                 for(i=0; i<MAXINTERNCC; i++)
 709                                 {
 710                                         // Look for the condition code & break if found
 711                                         if (strcmp(condname[i], scratch) == 0)
 712                                         {
 713                                                 val = condnumber[i];
 714                                                 break;
 715                                         }
 716                                 }
 717
 718                                 // Standard CC was not found, look for an equated one
 719                                 if (val == 99)
 720                                 {
 721 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 722                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 723
 724                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 725                                         {
 726                                                 val = ccsym->svalue;
 727                                         }
 728                                         else
 729                                         {
 730                                                 error("unknown condition code");
 731                                                 return ERROR;
 732                                         }
 733                                 }
 734
 735                                 tok += 2;
 736                                 CHECK_COMMA;
 737                         }
 738                         else if (*tok == '(')
 739                         {
 740                                 // Set CC to "Jump Always"
 741                                 val = 0;
 742                         }
 743                 }
 744                 else
 745                 {
 746                         // Set CC to "Jump Always"
 747                         val = 0;
 748                 }
 749
 750                 if (val < 0 || val > 31)
 751                 {
 752                         error("condition constant out of range");
 753                         return ERROR;
 754                 }
 755
 756                 // Store condition code
 757                 reg1 = val;
 758
 759                 if (type == RI_JR)
 760                 {
 761                         // JR cc,n
 762                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 763                                 return MalformedOpcode(0x0F);
 764
 765                         if ((challoc - ch_size) < 4)
 766                                 chcheck(4L);
 767
 768                         if (!(eattr & DEFINED))
 769                         {
 770                                 fixup(FU_WORD | FU_JR, sloc, r_expr);
 771                                 reg2 = 0;
 772                         }
 773                         else
 774                         {
 775                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 776
 777                                 if ((reg2 < -16) || (reg2 > 15))
 778                                         error("PC relative overflow");
 779                         }
 780
 781                         BuildRISCIntructionWord(parm, reg2, reg1);
 782                 }
 783                 else
 784                 {
 785                         // JUMP cc, (Rn)
 786                         if (*tok != '(')
 787                                 return MalformedOpcode(0x10);
 788
 789                         tok++;
 790                         reg2 = GetRegister(FU_REGTWO);
 791
 792                         if (*tok != ')')
 793                                 return MalformedOpcode(0x11);
 794
 795                         tok++;
 796                         at_eol();
 797                         BuildRISCIntructionWord(parm, reg2, reg1);
 798                 }
 799
 800                 break;
 801
 802         // Should never get here :-D
 803         default:
 804                 error("Unknown risc opcode type");
 805                 return ERROR;
 806         }
 807
 808         return 0;
 809 }
 810