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                          // Declare 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 int lastOpcode = -1;            // Last RISC opcode assembled
  30
  31 const char reg_err[] = "missing register R0...R31";
  32
  33 // Jaguar Jump Condition Names
  34 const char condname[MAXINTERNCC][5] = {
  35         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  36         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  37         "PL", "MI", "F"
  38 };
  39
  40 // Jaguar Jump Condition Numbers
  41 const char condnumber[] = {
  42         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  43         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  44 };
  45
  46 const struct opcoderecord roptbl[] = {
  47         { MR_ADD,     RI_TWO,    0 },
  48         { MR_ADDC,    RI_TWO,    1 },
  49         { MR_ADDQ,    RI_NUM_32, 2 },
  50         { MR_ADDQT,   RI_NUM_32, 3 },
  51         { MR_SUB,     RI_TWO,    4 },
  52         { MR_SUBC,    RI_TWO,    5 },
  53         { MR_SUBQ,    RI_NUM_32, 6 },
  54         { MR_SUBQT,   RI_NUM_32, 7 },
  55         { MR_NEG,     RI_ONE,    8 },
  56         { MR_AND,     RI_TWO,    9 },
  57         { MR_OR,      RI_TWO,    10 },
  58         { MR_XOR,     RI_TWO,    11 },
  59         { MR_NOT,     RI_ONE,    12 },
  60         { MR_BTST,    RI_NUM_31, 13 },
  61         { MR_BSET,    RI_NUM_31, 14 },
  62         { MR_BCLR,    RI_NUM_31, 15 },
  63         { MR_MULT,    RI_TWO,    16 },
  64         { MR_IMULT,   RI_TWO,    17 },
  65         { MR_IMULTN,  RI_TWO,    18 },
  66         { MR_RESMAC,  RI_ONE,    19 },
  67         { MR_IMACN,   RI_TWO,    20 },
  68         { MR_DIV,     RI_TWO,    21 },
  69         { MR_ABS,     RI_ONE,    22 },
  70         { MR_SH,      RI_TWO,    23 },
  71         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  72         { MR_SHRQ,    RI_NUM_32, 25 },
  73         { MR_SHA,     RI_TWO,    26 },
  74         { MR_SHARQ,   RI_NUM_32, 27 },
  75         { MR_ROR,     RI_TWO,    28 },
  76         { MR_RORQ,    RI_NUM_32, 29 },
  77         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  78         { MR_CMP,     RI_TWO,    30 },
  79         { MR_CMPQ,    RI_NUM_15, 31 },
  80         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  81         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  82         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  83         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  84         { MR_MOVEQ,   RI_NUM_31, 35 },
  85         { MR_MOVETA,  RI_TWO,    36 },
  86         { MR_MOVEFA,  RI_TWO,    37 },
  87         { MR_MOVEI,   RI_MOVEI,  38 },
  88         { MR_LOADB,   RI_LOADN,  39 },
  89         { MR_LOADW,   RI_LOADN,  40 },
  90         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  91         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  92         { MR_STOREB,  RI_STOREN, 45 },
  93         { MR_STOREW,  RI_STOREN, 46 },
  94         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  95         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  96         { MR_JUMP,    RI_JUMP,   52 },
  97         { MR_JR,      RI_JR,     53 },
  98         { MR_MMULT,   RI_TWO,    54 },
  99         { MR_MTOI,    RI_TWO,    55 },
 100         { MR_NORMI,   RI_TWO,    56 },
 101         { MR_NOP,     RI_NONE,   57 },
 102         { MR_SAT24,   RI_ONE,    62 },
 103         { MR_UNPACK,  RI_ONE,    63 + GPUONLY },
 104         { MR_PACK,    RI_ONE,    63 + GPUONLY },
 105         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 106         { MR_MOVE,    RI_MOVE,   0 },
 107         { MR_LOAD,    RI_LOAD,   0 },
 108         { MR_STORE,   RI_STORE,  0 }
 109 };
 110
 111
 112 //
 113 // Convert a string to uppercase
 114 //
 115 void strtoupper(char * s)
 116 {
 117         while (*s)
 118                 *s++ &= 0xDF;
 119 }
 120
 121
 122 //
 123 // Function to return "malformed expression" error
 124 // This is done mainly to remove a bunch of GOTO statements in the parser
 125 //
 126 static inline int MalformedOpcode(int signal)
 127 {
 128         char buf[16];
 129         sprintf(buf, "%02X", signal);
 130         return errors("Malformed opcode [internal $%s]", buf);
 131 }
 132
 133
 134 //
 135 // Build RISC instruction word
 136 //
 137 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 138 {
 139         // Check for absolute address setting
 140         if (!orgwarning && !orgactive)
 141         {
 142 //              warn("GPU/DSP code outside of absolute section");
 143                 warn("RISC code generated with no origin defined");
 144                 orgwarning = 1;
 145         }
 146
 147         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 148         D_word(value);
 149 }
 150
 151
 152 //
 153 // Get a RISC register
 154 //
 155 int GetRegister(WORD rattr)
 156 {
 157         VALUE eval;                                     // Expression value
 158         WORD eattr;                                     // Expression attributes
 159         SYM * esym;                                     // External symbol involved in expr.
 160         TOKEN r_expr[EXPRSIZE];         // Expression token list
 161
 162         // Evaluate what's in the global "tok" buffer
 163         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 164                 // Hmm, the evaluator should report the error to us...
 165 //              return MalformedOpcode(0x00);
 166                 return ERROR;
 167
 168         if ((challoc - ch_size) < 4)
 169                 chcheck(4L);
 170
 171         if (!(eattr & DEFINED))
 172         {
 173                 AddFixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 174                 return 0;
 175         }
 176
 177         // If we got a register in range (0-31), return it
 178         if ((eval >= 0) && (eval <= 31))
 179                 return eval;
 180
 181         // Otherwise, it's out of range & we flag an error
 182         return error(reg_err);
 183 }
 184
 185
 186 //
 187 // Do RISC code generation
 188 //
 189 int GenerateRISCCode(int state)
 190 {
 191         int reg1;                                       // Register 1
 192         int reg2;                                       // Register 2
 193         int val = 0;                            // Constructed value
 194         char scratch[80];
 195         SYM * ccsym;
 196         SYM * sy;
 197         int i, commaFound;
 198         TOKEN * t;
 199         WORD attrflg;
 200         int indexed;                            // Indexed register flag
 201
 202         VALUE eval;                                     // Expression value
 203         WORD eattr;                                     // Expression attributes
 204         SYM * esym;                                     // External symbol involved in expr.
 205         TOKEN r_expr[EXPRSIZE];         // Expression token list
 206
 207         // Get opcode parameter and type
 208         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 209         unsigned type = roptbl[state - 3000].typ;
 210
 211         // Detect whether the opcode parmeter passed determines that the opcode is
 212         // specific to only one of the RISC processors and ensure it is legal in
 213         // the current code section. If not then show error and return.
 214         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 215                 return error("Opcode is not valid in this code section");
 216
 217         // Process RISC opcode
 218         switch (type)
 219         {
 220         // No operand instructions
 221         // NOP (57)
 222         case RI_NONE:
 223                 BuildRISCIntructionWord(parm, 0, 0);
 224                 break;
 225
 226         // Single operand instructions (Rd)
 227         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S, UNPACK
 228         case RI_ONE:
 229                 reg2 = GetRegister(FU_REGTWO);
 230                 at_eol();
 231                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 232                 break;
 233
 234         // Two operand instructions (Rs,Rd)
 235         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT, MMULT,
 236         // MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 237         case RI_TWO:
 238                 if (parm == 37)
 239                         altbankok = 1;                      // MOVEFA
 240
 241                 reg1 = GetRegister(FU_REGONE);
 242                 CHECK_COMMA;
 243
 244                 if (parm == 36)
 245                         altbankok = 1;                      // MOVETA
 246
 247                 reg2 = GetRegister(FU_REGTWO);
 248                 at_eol();
 249                 BuildRISCIntructionWord(parm, reg1, reg2);
 250                 break;
 251
 252         // Numeric operand (n,Rd) where n = -16..+15
 253         // CMPQ
 254         case RI_NUM_15:
 255
 256         // Numeric operand (n,Rd) where n = 0..31
 257         // BCLR, BSET, BTST, MOVEQ
 258         case RI_NUM_31:
 259
 260         // Numeric operand (n,Rd) where n = 1..32
 261         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ, RORQ
 262         case RI_NUM_32:
 263                 switch (type)
 264                 {
 265                 case RI_NUM_15:
 266                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 267                         break;
 268                 default:
 269                 case RI_NUM_31:
 270                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 271                         break;
 272                 case RI_NUM_32:
 273                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 274                         break;
 275                 }
 276
 277                 if (parm & SUB32)
 278                         attrflg |= FU_SUB32;
 279
 280                 if (*tok != '#')
 281                         return MalformedOpcode(0x01);
 282
 283                 tok++;
 284
 285                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 286                         return MalformedOpcode(0x02);
 287
 288                 if ((challoc - ch_size) < 4)
 289                         chcheck(4L);
 290
 291                 if (!(eattr & DEFINED))
 292                 {
 293                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 294                         reg1 = 0;
 295                 }
 296                 else
 297                 {
 298                         if ((int)eval < reg1 || (int)eval > reg2)
 299                                 return error("constant out of range");
 300
 301                         if (parm & SUB32)
 302                                 reg1 = 32 - eval;
 303                         else if (type == RI_NUM_32)
 304                                 reg1 = (reg1 == 32 ? 0 : eval);
 305                         else
 306                                 reg1 = eval;
 307                 }
 308
 309                 CHECK_COMMA;
 310                 reg2 = GetRegister(FU_REGTWO);
 311                 at_eol();
 312                 BuildRISCIntructionWord(parm, reg1, reg2);
 313                 break;
 314
 315         // Move Immediate--n,Rn--n in Second Word
 316         case RI_MOVEI:
 317                 if (*tok != '#')
 318                         return MalformedOpcode(0x03);
 319
 320                 tok++;
 321
 322                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 323                         return MalformedOpcode(0x04);
 324
 325                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 326                 {
 327                         if (legacy_flag)
 328                         {
 329                                 // User doesn't care, emit a NOP to fix
 330                                 BuildRISCIntructionWord(57, 0, 0);
 331                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 332                         }
 333                         else
 334                                 warn("MOVEI immediately follows JUMP");
 335                 }
 336
 337                 if ((challoc - ch_size) < 4)
 338                         chcheck(4L);
 339
 340                 if (!(eattr & DEFINED))
 341                 {
 342                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 343                         eval = 0;
 344                 }
 345                 else
 346                 {
 347                         if (eattr & TDB)
 348 //{
 349 //printf("risca: Doing rmark for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 350                                 rmark(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 351 //}
 352                 }
 353
 354                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 355                 CHECK_COMMA;
 356                 reg2 = GetRegister(FU_REGTWO);
 357                 at_eol();
 358                 D_word((((parm & 0x3F) << 10) + reg2));
 359                 D_long(val);
 360                 break;
 361
 362         // PC,Rd or Rs,Rd
 363         case RI_MOVE:
 364                 if (*tok == KW_PC)
 365                 {
 366                         parm = 51;
 367                         reg1 = 0;
 368                         tok++;
 369                 }
 370                 else
 371                 {
 372                         parm = 34;
 373                         reg1 = GetRegister(FU_REGONE);
 374                 }
 375
 376                 CHECK_COMMA;
 377                 reg2 = GetRegister(FU_REGTWO);
 378                 at_eol();
 379                 BuildRISCIntructionWord(parm, reg1, reg2);
 380                 break;
 381
 382         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 383         case RI_LOAD:
 384                 indexed = 0;
 385                 parm = 41;
 386
 387                 if (*tok != '(')
 388                         return MalformedOpcode(0x05);
 389
 390                 tok++;
 391
 392                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 393                         indexed = (*tok - KW_R0);
 394
 395                 if (*tok == SYMBOL)
 396                 {
 397 //                      sy = lookup((char *)tok[1], LABEL, 0);
 398                         sy = lookup(string[tok[1]], LABEL, 0);
 399
 400                         if (!sy)
 401                         {
 402                                 error(reg_err);
 403                                 return ERROR;
 404                         }
 405
 406                         if (sy->sattre & EQUATEDREG)
 407                         {
 408                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 409                                         && (*(tok + 2) != ')'))
 410                                 {
 411                                         indexed = (sy->svalue & 0x1F);
 412                                         tok++;
 413                                 }
 414                         }
 415                 }
 416
 417                 if (!indexed)
 418                 {
 419                         reg1 = GetRegister(FU_REGONE);
 420                 }
 421                 else
 422                 {
 423                         reg1 = indexed;
 424                         indexed = 0;
 425                         tok++;
 426
 427                         if (*tok == '+')
 428                         {
 429                                 parm = (WORD)(reg1 - 14 + 58);
 430                                 tok++;
 431
 432                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 433                                         indexed = 1;
 434
 435                                 if (*tok == SYMBOL)
 436                                 {
 437 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 438                                         sy = lookup(string[tok[1]], LABEL, 0);
 439
 440                                         if (!sy)
 441                                         {
 442                                                 error(reg_err);
 443                                                 return ERROR;
 444                                         }
 445
 446                                         if (sy->sattre & EQUATEDREG)
 447                                                 indexed = 1;
 448                                 }
 449
 450                                 if (indexed)
 451                                 {
 452                                         reg1 = GetRegister(FU_REGONE);
 453                                 }
 454                                 else
 455                                 {
 456                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 457                                                 return MalformedOpcode(0x06);
 458
 459                                         if ((challoc - ch_size) < 4)
 460                                                 chcheck(4L);
 461
 462                                         if (!(eattr & DEFINED))
 463                                                 return error("constant expected after '+'");
 464
 465                                         reg1 = eval;
 466
 467                                         if (reg1 == 0)
 468                                         {
 469                                                 reg1 = 14 + (parm - 58);
 470                                                 parm = 41;
 471                                                 warn("NULL offset in LOAD ignored");
 472                                         }
 473                                         else
 474                                         {
 475                                                 if (reg1 < 1 || reg1 > 32)
 476                                                         return error("constant in LOAD out of range");
 477
 478                                                 if (reg1 == 32)
 479                                                         reg1 = 0;
 480
 481                                                 parm = (WORD)(parm - 58 + 43);
 482                                         }
 483                                 }
 484                         }
 485                         else
 486                         {
 487                                 reg1 = GetRegister(FU_REGONE);
 488                         }
 489                 }
 490
 491                 if (*tok != ')')
 492                         return MalformedOpcode(0x07);
 493
 494                 tok++;
 495                 CHECK_COMMA;
 496                 reg2 = GetRegister(FU_REGTWO);
 497                 at_eol();
 498                 BuildRISCIntructionWord(parm, reg1, reg2);
 499                 break;
 500
 501         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 502         case RI_STORE:
 503                 parm = 47;
 504                 reg1 = GetRegister(FU_REGONE);
 505                 CHECK_COMMA;
 506
 507                 if (*tok != '(')
 508                         return MalformedOpcode(0x08);
 509
 510                 tok++;
 511                 indexed = 0;
 512
 513                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 514                         indexed = (*tok - KW_R0);
 515
 516                 if (*tok == SYMBOL)
 517                 {
 518                         sy = lookup(string[tok[1]], LABEL, 0);
 519
 520                         if (!sy)
 521                         {
 522                                 error(reg_err);
 523                                 return ERROR;
 524                         }
 525
 526                         if (sy->sattre & EQUATEDREG)
 527                         {
 528                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 529                                         && (*(tok + 2) != ')'))
 530                                 {
 531                                         indexed = (sy->svalue & 0x1F);
 532                                         tok++;
 533                                 }
 534                         }
 535                 }
 536
 537                 if (!indexed)
 538                 {
 539                         reg2 = GetRegister(FU_REGTWO);
 540                 }
 541                 else
 542                 {
 543                         reg2 = indexed;
 544                         indexed = 0;
 545                         tok++;
 546
 547                         if (*tok == '+')
 548                         {
 549                                 parm = (WORD)(reg2 - 14 + 60);
 550                                 tok++;
 551
 552                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 553                                         indexed = 1;
 554
 555                                 if (*tok == SYMBOL)
 556                                 {
 557                                         sy = lookup(string[tok[1]], LABEL, 0);
 558
 559                                         if (!sy)
 560                                         {
 561                                                 error(reg_err);
 562                                                 return ERROR;
 563                                         }
 564
 565                                         if (sy->sattre & EQUATEDREG)
 566                                                 indexed = 1;
 567                                 }
 568
 569                                 if (indexed)
 570                                 {
 571                                         reg2 = GetRegister(FU_REGTWO);
 572                                 }
 573                                 else
 574                                 {
 575                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 576                                                 return MalformedOpcode(0x09);
 577
 578                                         if ((challoc - ch_size) < 4)
 579                                                 chcheck(4L);
 580
 581                                         if (!(eattr & DEFINED))
 582                                         {
 583                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 584                                                 reg2 = 0;
 585                                         }
 586                                         else
 587                                         {
 588                                                 reg2 = eval;
 589
 590                                                 if (reg2 == 0)
 591                                                 {
 592                                                         reg2 = 14 + (parm - 60);
 593                                                         parm = 47;
 594                                                         warn("NULL offset in STORE ignored");
 595                                                 }
 596                                                 else
 597                                                 {
 598                                                         if (reg2 < 1 || reg2 > 32)
 599                                                                 return error("constant in STORE out of range");
 600
 601                                                         if (reg2 == 32)
 602                                                                 reg2 = 0;
 603
 604                                                         parm = (WORD)(parm - 60 + 49);
 605                                                 }
 606                                         }
 607                                 }
 608                         }
 609                         else
 610                         {
 611                                 reg2 = GetRegister(FU_REGTWO);
 612                         }
 613                 }
 614
 615                 if (*tok != ')')
 616                         return MalformedOpcode(0x0A);
 617
 618                 tok++;
 619                 at_eol();
 620                 BuildRISCIntructionWord(parm, reg2, reg1);
 621                 break;
 622
 623         // LOADB/LOADP/LOADW (Rn),Rn
 624         case RI_LOADN:
 625                 if (*tok != '(')
 626                         return MalformedOpcode(0x0B);
 627
 628                 tok++;
 629                 reg1 = GetRegister(FU_REGONE);
 630
 631                 if (*tok != ')')
 632                         return MalformedOpcode(0x0C);
 633
 634                 tok++;
 635                 CHECK_COMMA;
 636                 reg2 = GetRegister(FU_REGTWO);
 637                 at_eol();
 638                 BuildRISCIntructionWord(parm, reg1, reg2);
 639                 break;
 640
 641         // STOREB/STOREP/STOREW Rn,(Rn)
 642         case RI_STOREN:
 643                 reg1 = GetRegister(FU_REGONE);
 644                 CHECK_COMMA;
 645
 646                 if (*tok != '(')
 647                         return MalformedOpcode(0x0D);
 648
 649                 tok++;
 650                 reg2 = GetRegister(FU_REGTWO);
 651
 652                 if (*tok != ')')
 653                         return MalformedOpcode(0x0E);
 654
 655                 tok++;
 656                 at_eol();
 657                 BuildRISCIntructionWord(parm, reg2, reg1);
 658                 break;
 659
 660         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 661         case RI_JR:
 662
 663         // Jump Absolute - cc,(Rs) - reg2=cc
 664         case RI_JUMP:
 665                 // Check to see if there is a comma in the token string. If not then
 666                 // the JR or JUMP should default to 0, Jump Always
 667                 commaFound = 0;
 668
 669                 for(t=tok; *t!=EOL; t++)
 670                 {
 671                         if (*t == ',')
 672                         {
 673                                 commaFound = 1;
 674                                 break;
 675                         }
 676                 }
 677
 678                 if (commaFound)
 679                 {
 680                         if (*tok == CONST)
 681                         {
 682                                 // CC using a constant number
 683                                 tok++;
 684                                 val = *tok;
 685                                 tok++;
 686                                 CHECK_COMMA;
 687                         }
 688                         else if (*tok == SYMBOL)
 689                         {
 690                                 val = 99;
 691 //                              strcpy(scratch, (char *)tok[1]);
 692                                 strcpy(scratch, string[tok[1]]);
 693                                 strtoupper(scratch);
 694
 695                                 for(i=0; i<MAXINTERNCC; i++)
 696                                 {
 697                                         // Look for the condition code & break if found
 698                                         if (strcmp(condname[i], scratch) == 0)
 699                                         {
 700                                                 val = condnumber[i];
 701                                                 break;
 702                                         }
 703                                 }
 704
 705                                 // Standard CC was not found, look for an equated one
 706                                 if (val == 99)
 707                                 {
 708 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 709                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 710
 711                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 712                                         {
 713                                                 val = ccsym->svalue;
 714                                         }
 715                                         else
 716                                                 return error("unknown condition code");
 717                                 }
 718
 719                                 tok += 2;
 720                                 CHECK_COMMA;
 721                         }
 722                         else if (*tok == '(')
 723                         {
 724                                 // Set CC to "Jump Always"
 725                                 val = 0;
 726                         }
 727                 }
 728                 else
 729                 {
 730                         // Set CC to "Jump Always"
 731                         val = 0;
 732                 }
 733
 734                 if (val < 0 || val > 31)
 735                         return error("condition constant out of range");
 736
 737                 // Store condition code
 738                 reg1 = val;
 739
 740                 if (type == RI_JR)
 741                 {
 742                         // JR cc,n
 743                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 744                                 return MalformedOpcode(0x0F);
 745
 746                         if ((challoc - ch_size) < 4)
 747                                 chcheck(4L);
 748
 749                         if (!(eattr & DEFINED))
 750                         {
 751                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 752                                 reg2 = 0;
 753                         }
 754                         else
 755                         {
 756                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 757
 758                                 if ((reg2 < -16) || (reg2 > 15))
 759                                         error("PC relative overflow");
 760                         }
 761
 762                         BuildRISCIntructionWord(parm, reg2, reg1);
 763                 }
 764                 else
 765                 {
 766                         // JUMP cc, (Rn)
 767                         if (*tok != '(')
 768                                 return MalformedOpcode(0x10);
 769
 770                         tok++;
 771                         reg2 = GetRegister(FU_REGTWO);
 772
 773                         if (*tok != ')')
 774                                 return MalformedOpcode(0x11);
 775
 776                         tok++;
 777                         at_eol();
 778                         BuildRISCIntructionWord(parm, reg2, reg1);
 779                 }
 780
 781                 break;
 782
 783         // Should never get here :-D
 784         default:
 785                 return error("Unknown RISC opcode type");
 786         }
 787
 788         lastOpcode = type;
 789         return 0;
 790 }
 791