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 uint8_t riscImmTokenSeen;       // The '#' (immediate) token was seen
  31
  32 const char reg_err[] = "missing register R0...R31";
  33
  34 // Jaguar Jump Condition Names
  35 const char condname[MAXINTERNCC][5] = {
  36         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  37         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  38         "PL", "MI", "F"
  39 };
  40
  41 // Jaguar Jump Condition Numbers
  42 const char condnumber[] = {
  43         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  44         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  45 };
  46
  47 const struct opcoderecord roptbl[] = {
  48         { MR_ADD,     RI_TWO,    0 },
  49         { MR_ADDC,    RI_TWO,    1 },
  50         { MR_ADDQ,    RI_NUM_32, 2 },
  51         { MR_ADDQT,   RI_NUM_32, 3 },
  52         { MR_SUB,     RI_TWO,    4 },
  53         { MR_SUBC,    RI_TWO,    5 },
  54         { MR_SUBQ,    RI_NUM_32, 6 },
  55         { MR_SUBQT,   RI_NUM_32, 7 },
  56         { MR_NEG,     RI_ONE,    8 },
  57         { MR_AND,     RI_TWO,    9 },
  58         { MR_OR,      RI_TWO,    10 },
  59         { MR_XOR,     RI_TWO,    11 },
  60         { MR_NOT,     RI_ONE,    12 },
  61         { MR_BTST,    RI_NUM_31, 13 },
  62         { MR_BSET,    RI_NUM_31, 14 },
  63         { MR_BCLR,    RI_NUM_31, 15 },
  64         { MR_MULT,    RI_TWO,    16 },
  65         { MR_IMULT,   RI_TWO,    17 },
  66         { MR_IMULTN,  RI_TWO,    18 },
  67         { MR_RESMAC,  RI_ONE,    19 },
  68         { MR_IMACN,   RI_TWO,    20 },
  69         { MR_DIV,     RI_TWO,    21 },
  70         { MR_ABS,     RI_ONE,    22 },
  71         { MR_SH,      RI_TWO,    23 },
  72         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  73         { MR_SHRQ,    RI_NUM_32, 25 },
  74         { MR_SHA,     RI_TWO,    26 },
  75         { MR_SHARQ,   RI_NUM_32, 27 },
  76         { MR_ROR,     RI_TWO,    28 },
  77         { MR_RORQ,    RI_NUM_32, 29 },
  78         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  79         { MR_CMP,     RI_TWO,    30 },
  80         { MR_CMPQ,    RI_NUM_15, 31 },
  81         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  82         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  83         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  84         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  85         { MR_MOVEQ,   RI_NUM_31, 35 },
  86         { MR_MOVETA,  RI_TWO,    36 },
  87         { MR_MOVEFA,  RI_TWO,    37 },
  88         { MR_MOVEI,   RI_MOVEI,  38 },
  89         { MR_LOADB,   RI_LOADN,  39 },
  90         { MR_LOADW,   RI_LOADN,  40 },
  91         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  92         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  93         { MR_STOREB,  RI_STOREN, 45 },
  94         { MR_STOREW,  RI_STOREN, 46 },
  95         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  96         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  97         { MR_JUMP,    RI_JUMP,   52 },
  98         { MR_JR,      RI_JR,     53 },
  99         { MR_MMULT,   RI_TWO,    54 },
 100         { MR_MTOI,    RI_TWO,    55 },
 101         { MR_NORMI,   RI_TWO,    56 },
 102         { MR_NOP,     RI_NONE,   57 },
 103         { MR_SAT24,   RI_ONE,    62 },
 104         { MR_UNPACK,  RI_ONE,    63 + GPUONLY },
 105         { MR_PACK,    RI_ONE,    63 + GPUONLY },
 106         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 107         { MR_MOVE,    RI_MOVE,   0 },
 108         { MR_LOAD,    RI_LOAD,   0 },
 109         { MR_STORE,   RI_STORE,  0 }
 110 };
 111
 112
 113 //
 114 // Convert a string to uppercase
 115 //
 116 void strtoupper(char * s)
 117 {
 118         while (*s)
 119                 *s++ &= 0xDF;
 120 }
 121
 122
 123 //
 124 // Function to return "malformed expression" error
 125 // This is done mainly to remove a bunch of GOTO statements in the parser
 126 //
 127 static inline int MalformedOpcode(int signal)
 128 {
 129         char buf[16];
 130         sprintf(buf, "%02X", signal);
 131         return errors("Malformed opcode [internal $%s]", buf);
 132 }
 133
 134
 135 //
 136 // Build RISC instruction word
 137 //
 138 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 139 {
 140         // Check for absolute address setting
 141         if (!orgwarning && !orgactive)
 142         {
 143 //              warn("GPU/DSP code outside of absolute section");
 144                 warn("RISC code generated with no origin defined");
 145                 orgwarning = 1;
 146         }
 147
 148         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 149         D_word(value);
 150 }
 151
 152
 153 //
 154 // Get a RISC register
 155 //
 156 int GetRegister(WORD rattr)
 157 {
 158         VALUE eval;                                     // Expression value
 159         WORD eattr;                                     // Expression attributes
 160         SYM * esym;                                     // External symbol involved in expr.
 161         TOKEN r_expr[EXPRSIZE];         // Expression token list
 162
 163         // Evaluate what's in the global "tok" buffer
 164         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 165                 return ERROR;
 166
 167         if ((challoc - ch_size) < 4)
 168                 chcheck(4L);
 169
 170         if (!(eattr & DEFINED))
 171         {
 172                 AddFixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 173                 return 0;
 174         }
 175
 176         // If we got a register in range (0-31), return it
 177         if ((eval >= 0) && (eval <= 31))
 178                 return eval;
 179
 180         // Otherwise, it's out of range & we flag an error
 181         return error(reg_err);
 182 }
 183
 184
 185 //
 186 // Do RISC code generation
 187 //
 188 int GenerateRISCCode(int state)
 189 {
 190         int reg1;                                       // Register 1
 191         int reg2;                                       // Register 2
 192         int val = 0;                            // Constructed value
 193         char scratch[80];
 194         SYM * ccsym;
 195         SYM * sy;
 196         int i, commaFound;
 197         TOKEN * t;
 198         WORD attrflg;
 199         int indexed;                            // Indexed register flag
 200
 201         VALUE eval;                                     // Expression value
 202         WORD eattr;                                     // Expression attributes
 203         SYM * esym;                                     // External symbol involved in expr.
 204         TOKEN r_expr[EXPRSIZE];         // Expression token list
 205
 206         // Get opcode parameter and type
 207         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 208         unsigned type = roptbl[state - 3000].typ;
 209         riscImmTokenSeen = 0;           // Set to "token not seen yet"
 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                 riscImmTokenSeen = 1;
 285
 286                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 287                         return MalformedOpcode(0x02);
 288
 289                 if ((challoc - ch_size) < 4)
 290                         chcheck(4L);
 291
 292                 if (!(eattr & DEFINED))
 293                 {
 294                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 295                         reg1 = 0;
 296                 }
 297                 else
 298                 {
 299                         if ((int)eval < reg1 || (int)eval > reg2)
 300                                 return error("constant out of range");
 301
 302                         if (parm & SUB32)
 303                                 reg1 = 32 - eval;
 304                         else if (type == RI_NUM_32)
 305                                 reg1 = (reg1 == 32 ? 0 : eval);
 306                         else
 307                                 reg1 = eval;
 308                 }
 309
 310                 CHECK_COMMA;
 311                 reg2 = GetRegister(FU_REGTWO);
 312                 at_eol();
 313                 BuildRISCIntructionWord(parm, reg1, reg2);
 314                 break;
 315
 316         // Move Immediate--n,Rn--n in Second Word
 317         case RI_MOVEI:
 318                 if (*tok != '#')
 319                         return MalformedOpcode(0x03);
 320
 321                 tok++;
 322                 riscImmTokenSeen = 1;
 323
 324                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 325                         return MalformedOpcode(0x04);
 326
 327                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 328                 {
 329                         if (legacy_flag)
 330                         {
 331                                 // User doesn't care, emit a NOP to fix
 332                                 BuildRISCIntructionWord(57, 0, 0);
 333                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 334                         }
 335                         else
 336                                 warn("MOVEI immediately follows JUMP");
 337                 }
 338
 339                 if ((challoc - ch_size) < 4)
 340                         chcheck(4L);
 341
 342                 if (!(eattr & DEFINED))
 343                 {
 344                         AddFixup(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                                                 return error("constant expected after '+'");
 466
 467                                         reg1 = eval;
 468
 469                                         if (reg1 == 0)
 470                                         {
 471                                                 reg1 = 14 + (parm - 58);
 472                                                 parm = 41;
 473                                                 warn("NULL offset in LOAD ignored");
 474                                         }
 475                                         else
 476                                         {
 477                                                 if (reg1 < 1 || reg1 > 32)
 478                                                         return error("constant in LOAD out of range");
 479
 480                                                 if (reg1 == 32)
 481                                                         reg1 = 0;
 482
 483                                                 parm = (WORD)(parm - 58 + 43);
 484                                         }
 485                                 }
 486                         }
 487                         else
 488                         {
 489                                 reg1 = GetRegister(FU_REGONE);
 490                         }
 491                 }
 492
 493                 if (*tok != ')')
 494                         return MalformedOpcode(0x07);
 495
 496                 tok++;
 497                 CHECK_COMMA;
 498                 reg2 = GetRegister(FU_REGTWO);
 499                 at_eol();
 500                 BuildRISCIntructionWord(parm, reg1, reg2);
 501                 break;
 502
 503         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 504         case RI_STORE:
 505                 parm = 47;
 506                 reg1 = GetRegister(FU_REGONE);
 507                 CHECK_COMMA;
 508
 509                 if (*tok != '(')
 510                         return MalformedOpcode(0x08);
 511
 512                 tok++;
 513                 indexed = 0;
 514
 515                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 516                         indexed = (*tok - KW_R0);
 517
 518                 if (*tok == SYMBOL)
 519                 {
 520                         sy = lookup(string[tok[1]], LABEL, 0);
 521
 522                         if (!sy)
 523                         {
 524                                 error(reg_err);
 525                                 return ERROR;
 526                         }
 527
 528                         if (sy->sattre & EQUATEDREG)
 529                         {
 530                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 531                                         && (*(tok + 2) != ')'))
 532                                 {
 533                                         indexed = (sy->svalue & 0x1F);
 534                                         tok++;
 535                                 }
 536                         }
 537                 }
 538
 539                 if (!indexed)
 540                 {
 541                         reg2 = GetRegister(FU_REGTWO);
 542                 }
 543                 else
 544                 {
 545                         reg2 = indexed;
 546                         indexed = 0;
 547                         tok++;
 548
 549                         if (*tok == '+')
 550                         {
 551                                 parm = (WORD)(reg2 - 14 + 60);
 552                                 tok++;
 553
 554                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 555                                         indexed = 1;
 556
 557                                 if (*tok == SYMBOL)
 558                                 {
 559                                         sy = lookup(string[tok[1]], LABEL, 0);
 560
 561                                         if (!sy)
 562                                         {
 563                                                 error(reg_err);
 564                                                 return ERROR;
 565                                         }
 566
 567                                         if (sy->sattre & EQUATEDREG)
 568                                                 indexed = 1;
 569                                 }
 570
 571                                 if (indexed)
 572                                 {
 573                                         reg2 = GetRegister(FU_REGTWO);
 574                                 }
 575                                 else
 576                                 {
 577                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 578                                                 return MalformedOpcode(0x09);
 579
 580                                         if ((challoc - ch_size) < 4)
 581                                                 chcheck(4L);
 582
 583                                         if (!(eattr & DEFINED))
 584                                         {
 585                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 586                                                 reg2 = 0;
 587                                         }
 588                                         else
 589                                         {
 590                                                 reg2 = eval;
 591
 592                                                 if (reg2 == 0)
 593                                                 {
 594                                                         reg2 = 14 + (parm - 60);
 595                                                         parm = 47;
 596                                                         warn("NULL offset in STORE ignored");
 597                                                 }
 598                                                 else
 599                                                 {
 600                                                         if (reg2 < 1 || reg2 > 32)
 601                                                                 return error("constant in STORE out of range");
 602
 603                                                         if (reg2 == 32)
 604                                                                 reg2 = 0;
 605
 606                                                         parm = (WORD)(parm - 60 + 49);
 607                                                 }
 608                                         }
 609                                 }
 610                         }
 611                         else
 612                         {
 613                                 reg2 = GetRegister(FU_REGTWO);
 614                         }
 615                 }
 616
 617                 if (*tok != ')')
 618                         return MalformedOpcode(0x0A);
 619
 620                 tok++;
 621                 at_eol();
 622                 BuildRISCIntructionWord(parm, reg2, reg1);
 623                 break;
 624
 625         // LOADB/LOADP/LOADW (Rn),Rn
 626         case RI_LOADN:
 627                 if (*tok != '(')
 628                         return MalformedOpcode(0x0B);
 629
 630                 tok++;
 631                 reg1 = GetRegister(FU_REGONE);
 632
 633                 if (*tok != ')')
 634                         return MalformedOpcode(0x0C);
 635
 636                 tok++;
 637                 CHECK_COMMA;
 638                 reg2 = GetRegister(FU_REGTWO);
 639                 at_eol();
 640                 BuildRISCIntructionWord(parm, reg1, reg2);
 641                 break;
 642
 643         // STOREB/STOREP/STOREW Rn,(Rn)
 644         case RI_STOREN:
 645                 reg1 = GetRegister(FU_REGONE);
 646                 CHECK_COMMA;
 647
 648                 if (*tok != '(')
 649                         return MalformedOpcode(0x0D);
 650
 651                 tok++;
 652                 reg2 = GetRegister(FU_REGTWO);
 653
 654                 if (*tok != ')')
 655                         return MalformedOpcode(0x0E);
 656
 657                 tok++;
 658                 at_eol();
 659                 BuildRISCIntructionWord(parm, reg2, reg1);
 660                 break;
 661
 662         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 663         case RI_JR:
 664
 665         // Jump Absolute - cc,(Rs) - reg2=cc
 666         case RI_JUMP:
 667                 // Check to see if there is a comma in the token string. If not then
 668                 // the JR or JUMP should default to 0, Jump Always
 669                 commaFound = 0;
 670
 671                 for(t=tok; *t!=EOL; t++)
 672                 {
 673                         if (*t == ',')
 674                         {
 675                                 commaFound = 1;
 676                                 break;
 677                         }
 678                 }
 679
 680                 if (commaFound)
 681                 {
 682                         if (*tok == CONST)
 683                         {
 684                                 // CC using a constant number
 685                                 tok++;
 686                                 val = *tok;
 687                                 tok++;
 688                                 CHECK_COMMA;
 689                         }
 690                         else if (*tok == SYMBOL)
 691                         {
 692                                 val = 99;
 693 //                              strcpy(scratch, (char *)tok[1]);
 694                                 strcpy(scratch, string[tok[1]]);
 695                                 strtoupper(scratch);
 696
 697                                 for(i=0; i<MAXINTERNCC; i++)
 698                                 {
 699                                         // Look for the condition code & break if found
 700                                         if (strcmp(condname[i], scratch) == 0)
 701                                         {
 702                                                 val = condnumber[i];
 703                                                 break;
 704                                         }
 705                                 }
 706
 707                                 // Standard CC was not found, look for an equated one
 708                                 if (val == 99)
 709                                 {
 710 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 711                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 712
 713                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 714                                         {
 715                                                 val = ccsym->svalue;
 716                                         }
 717                                         else
 718                                                 return error("unknown condition code");
 719                                 }
 720
 721                                 tok += 2;
 722                                 CHECK_COMMA;
 723                         }
 724                         else if (*tok == '(')
 725                         {
 726                                 // Set CC to "Jump Always"
 727                                 val = 0;
 728                         }
 729                 }
 730                 else
 731                 {
 732                         // Set CC to "Jump Always"
 733                         val = 0;
 734                 }
 735
 736                 if (val < 0 || val > 31)
 737                         return error("condition constant out of range");
 738
 739                 // Store condition code
 740                 reg1 = val;
 741
 742                 if (type == RI_JR)
 743                 {
 744                         // JR cc,n
 745                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 746                                 return MalformedOpcode(0x0F);
 747
 748                         if ((challoc - ch_size) < 4)
 749                                 chcheck(4L);
 750
 751                         if (!(eattr & DEFINED))
 752                         {
 753                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 754                                 reg2 = 0;
 755                         }
 756                         else
 757                         {
 758                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 759
 760                                 if ((reg2 < -16) || (reg2 > 15))
 761                                         error("PC relative overflow");
 762                         }
 763
 764                         BuildRISCIntructionWord(parm, reg2, reg1);
 765                 }
 766                 else
 767                 {
 768                         // JUMP cc, (Rn)
 769                         if (*tok != '(')
 770                                 return MalformedOpcode(0x10);
 771
 772                         tok++;
 773                         reg2 = GetRegister(FU_REGTWO);
 774
 775                         if (*tok != ')')
 776                                 return MalformedOpcode(0x11);
 777
 778                         tok++;
 779                         at_eol();
 780                         BuildRISCIntructionWord(parm, reg2, reg1);
 781                 }
 782
 783                 break;
 784
 785         // Should never get here :-D
 786         default:
 787                 return error("Unknown RISC opcode type");
 788         }
 789
 790         lastOpcode = type;
 791         return 0;
 792 }
 793