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 | (0 << 6) },
 105         { MR_PACK,    RI_ONE,    63 + GPUONLY | (1 << 6) },
 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 $%s]", buf);
 132 }
 133
 134
 135 //
 136 // Build RISC instruction word
 137 //
 138 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 139 {
 140         // Check for absolute address setting
 141         if (!orgwarning && !orgactive)
 142         {
 143                 warn("RISC code generated with no origin defined");
 144                 orgwarning = 1;
 145         }
 146
 147         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 148         D_word(value);
 149 //printf("BuildRISC: opcode=$%X, reg1=$%X, reg2=$%X, final=$%04X\n", opcode, reg1, reg2, 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,
 228         // UNPACK
 229         case RI_ONE:
 230                 reg2 = GetRegister(FU_REGTWO);
 231                 at_eol();
 232                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 233                 break;
 234
 235         // Two operand instructions (Rs,Rd)
 236         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT,
 237         // MMULT, MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 238         case RI_TWO:
 239                 if (parm == 37)
 240                         altbankok = 1;                      // MOVEFA
 241
 242                 reg1 = GetRegister(FU_REGONE);
 243                 CHECK_COMMA;
 244
 245                 if (parm == 36)
 246                         altbankok = 1;                      // MOVETA
 247
 248                 reg2 = GetRegister(FU_REGTWO);
 249                 at_eol();
 250                 BuildRISCIntructionWord(parm, reg1, reg2);
 251                 break;
 252
 253         // Numeric operand (n,Rd) where n = -16..+15
 254         // CMPQ
 255         case RI_NUM_15:
 256
 257         // Numeric operand (n,Rd) where n = 0..31
 258         // BCLR, BSET, BTST, MOVEQ
 259         case RI_NUM_31:
 260
 261         // Numeric operand (n,Rd) where n = 1..32
 262         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ,
 263         // RORQ
 264         case RI_NUM_32:
 265                 switch (type)
 266                 {
 267                 case RI_NUM_15:
 268                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 269                         break;
 270                 default:
 271                 case RI_NUM_31:
 272                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 273                         break;
 274                 case RI_NUM_32:
 275                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 276                         break;
 277                 }
 278
 279                 if (parm & SUB32)
 280                         attrflg |= FU_SUB32;
 281
 282                 if (*tok != '#')
 283                         return MalformedOpcode(0x01);
 284
 285                 tok++;
 286                 riscImmTokenSeen = 1;
 287
 288                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 289                         return MalformedOpcode(0x02);
 290
 291                 if ((challoc - ch_size) < 4)
 292                         chcheck(4L);
 293
 294                 if (!(eattr & DEFINED))
 295                 {
 296                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 297                         reg1 = 0;
 298                 }
 299                 else
 300                 {
 301                         if ((int)eval < reg1 || (int)eval > reg2)
 302                                 return error("constant out of range");
 303
 304                         if (parm & SUB32)
 305                                 reg1 = 32 - eval;
 306                         else if (type == RI_NUM_32)
 307                                 reg1 = (reg1 == 32 ? 0 : eval);
 308                         else
 309                                 reg1 = eval;
 310                 }
 311
 312                 CHECK_COMMA;
 313                 reg2 = GetRegister(FU_REGTWO);
 314                 at_eol();
 315                 BuildRISCIntructionWord(parm, reg1, reg2);
 316                 break;
 317
 318         // Move Immediate--n,Rn--n in Second Word
 319         case RI_MOVEI:
 320                 if (*tok != '#')
 321                         return MalformedOpcode(0x03);
 322
 323                 tok++;
 324                 riscImmTokenSeen = 1;
 325
 326                 // Check for equated register after # and return error if so
 327                 if (*tok == SYMBOL)
 328                 {
 329                         sy = lookup(string[tok[1]], LABEL, 0);
 330
 331                         if (sy && (sy->sattre & EQUATEDREG))
 332                                 return error("equated register in 1st operand of MOVEI instruction");
 333                 }
 334
 335                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 336                         return MalformedOpcode(0x04);
 337
 338                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 339                 {
 340                         if (legacy_flag)
 341                         {
 342                                 // User doesn't care, emit a NOP to fix
 343                                 BuildRISCIntructionWord(57, 0, 0);
 344                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 345                         }
 346                         else
 347                                 warn("MOVEI immediately follows JUMP");
 348                 }
 349
 350                 if ((challoc - ch_size) < 4)
 351                         chcheck(4L);
 352
 353                 if (!(eattr & DEFINED))
 354                 {
 355                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 356                         eval = 0;
 357                 }
 358                 else
 359                 {
 360                         if (eattr & TDB)
 361 //{
 362 //printf("RISCASM: Doing rmark for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 363                                 rmark(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 364 //}
 365                 }
 366
 367                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 368                 CHECK_COMMA;
 369                 reg2 = GetRegister(FU_REGTWO);
 370                 at_eol();
 371                 D_word((((parm & 0x3F) << 10) + reg2));
 372                 D_long(val);
 373                 break;
 374
 375         // PC,Rd or Rs,Rd
 376         case RI_MOVE:
 377                 if (*tok == KW_PC)
 378                 {
 379                         parm = 51;
 380                         reg1 = 0;
 381                         tok++;
 382                 }
 383                 else
 384                 {
 385                         parm = 34;
 386                         reg1 = GetRegister(FU_REGONE);
 387                 }
 388
 389                 CHECK_COMMA;
 390                 reg2 = GetRegister(FU_REGTWO);
 391                 at_eol();
 392                 BuildRISCIntructionWord(parm, reg1, reg2);
 393                 break;
 394
 395         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 396         case RI_LOAD:
 397                 indexed = 0;
 398                 parm = 41;
 399
 400                 if (*tok != '(')
 401                         return MalformedOpcode(0x05);
 402
 403                 tok++;
 404
 405                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 406                         indexed = (*tok - KW_R0);
 407
 408                 if (*tok == SYMBOL)
 409                 {
 410 //                      sy = lookup((char *)tok[1], LABEL, 0);
 411                         sy = lookup(string[tok[1]], LABEL, 0);
 412
 413                         if (!sy)
 414                         {
 415                                 error(reg_err);
 416                                 return ERROR;
 417                         }
 418
 419                         if (sy->sattre & EQUATEDREG)
 420                         {
 421                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 422                                         && (*(tok + 2) != ')'))
 423                                 {
 424                                         indexed = (sy->svalue & 0x1F);
 425                                         tok++;
 426                                 }
 427                         }
 428                 }
 429
 430                 if (!indexed)
 431                 {
 432                         reg1 = GetRegister(FU_REGONE);
 433                 }
 434                 else
 435                 {
 436                         reg1 = indexed;
 437                         indexed = 0;
 438                         tok++;
 439
 440                         if (*tok == '+')
 441                         {
 442                                 parm = (WORD)(reg1 - 14 + 58);
 443                                 tok++;
 444
 445                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 446                                         indexed = 1;
 447
 448                                 if (*tok == SYMBOL)
 449                                 {
 450 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 451                                         sy = lookup(string[tok[1]], LABEL, 0);
 452
 453                                         if (!sy)
 454                                         {
 455                                                 error(reg_err);
 456                                                 return ERROR;
 457                                         }
 458
 459                                         if (sy->sattre & EQUATEDREG)
 460                                                 indexed = 1;
 461                                 }
 462
 463                                 if (indexed)
 464                                 {
 465                                         reg1 = GetRegister(FU_REGONE);
 466                                 }
 467                                 else
 468                                 {
 469                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 470                                                 return MalformedOpcode(0x06);
 471
 472                                         if ((challoc - ch_size) < 4)
 473                                                 chcheck(4L);
 474
 475                                         if (!(eattr & DEFINED))
 476                                                 return error("constant expected after '+'");
 477
 478                                         reg1 = eval;
 479
 480                                         if (reg1 == 0)
 481                                         {
 482                                                 reg1 = 14 + (parm - 58);
 483                                                 parm = 41;
 484                                                 warn("NULL offset in LOAD ignored");
 485                                         }
 486                                         else
 487                                         {
 488                                                 if (reg1 < 1 || reg1 > 32)
 489                                                         return error("constant in LOAD out of range");
 490
 491                                                 if (reg1 == 32)
 492                                                         reg1 = 0;
 493
 494                                                 parm = (WORD)(parm - 58 + 43);
 495                                         }
 496                                 }
 497                         }
 498                         else
 499                         {
 500                                 reg1 = GetRegister(FU_REGONE);
 501                         }
 502                 }
 503
 504                 if (*tok != ')')
 505                         return MalformedOpcode(0x07);
 506
 507                 tok++;
 508                 CHECK_COMMA;
 509                 reg2 = GetRegister(FU_REGTWO);
 510                 at_eol();
 511                 BuildRISCIntructionWord(parm, reg1, reg2);
 512                 break;
 513
 514         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 515         case RI_STORE:
 516                 parm = 47;
 517                 reg1 = GetRegister(FU_REGONE);
 518                 CHECK_COMMA;
 519
 520                 if (*tok != '(')
 521                         return MalformedOpcode(0x08);
 522
 523                 tok++;
 524                 indexed = 0;
 525
 526                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 527                         indexed = (*tok - KW_R0);
 528
 529                 if (*tok == SYMBOL)
 530                 {
 531                         sy = lookup(string[tok[1]], LABEL, 0);
 532
 533                         if (!sy)
 534                         {
 535                                 error(reg_err);
 536                                 return ERROR;
 537                         }
 538
 539                         if (sy->sattre & EQUATEDREG)
 540                         {
 541                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 542                                         && (*(tok + 2) != ')'))
 543                                 {
 544                                         indexed = (sy->svalue & 0x1F);
 545                                         tok++;
 546                                 }
 547                         }
 548                 }
 549
 550                 if (!indexed)
 551                 {
 552                         reg2 = GetRegister(FU_REGTWO);
 553                 }
 554                 else
 555                 {
 556                         reg2 = indexed;
 557                         indexed = 0;
 558                         tok++;
 559
 560                         if (*tok == '+')
 561                         {
 562                                 parm = (WORD)(reg2 - 14 + 60);
 563                                 tok++;
 564
 565                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 566                                         indexed = 1;
 567
 568                                 if (*tok == SYMBOL)
 569                                 {
 570                                         sy = lookup(string[tok[1]], LABEL, 0);
 571
 572                                         if (!sy)
 573                                         {
 574                                                 error(reg_err);
 575                                                 return ERROR;
 576                                         }
 577
 578                                         if (sy->sattre & EQUATEDREG)
 579                                                 indexed = 1;
 580                                 }
 581
 582                                 if (indexed)
 583                                 {
 584                                         reg2 = GetRegister(FU_REGTWO);
 585                                 }
 586                                 else
 587                                 {
 588                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 589                                                 return MalformedOpcode(0x09);
 590
 591                                         if ((challoc - ch_size) < 4)
 592                                                 chcheck(4L);
 593
 594                                         if (!(eattr & DEFINED))
 595                                         {
 596                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 597                                                 reg2 = 0;
 598                                         }
 599                                         else
 600                                         {
 601                                                 reg2 = eval;
 602
 603                                                 if (reg2 == 0)
 604                                                 {
 605                                                         reg2 = 14 + (parm - 60);
 606                                                         parm = 47;
 607                                                         warn("NULL offset in STORE ignored");
 608                                                 }
 609                                                 else
 610                                                 {
 611                                                         if (reg2 < 1 || reg2 > 32)
 612                                                                 return error("constant in STORE out of range");
 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                                                 return error("unknown condition code");
 730                                 }
 731
 732                                 tok += 2;
 733                                 CHECK_COMMA;
 734                         }
 735                         else if (*tok == '(')
 736                         {
 737                                 // Set CC to "Jump Always"
 738                                 val = 0;
 739                         }
 740                 }
 741                 else
 742                 {
 743                         // Set CC to "Jump Always"
 744                         val = 0;
 745                 }
 746
 747                 if (val < 0 || val > 31)
 748                         return error("condition constant out of range");
 749
 750                 // Store condition code
 751                 reg1 = val;
 752
 753                 if (type == RI_JR)
 754                 {
 755                         // JR cc,n
 756                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 757                                 return MalformedOpcode(0x0F);
 758
 759                         if ((challoc - ch_size) < 4)
 760                                 chcheck(4L);
 761
 762                         if (!(eattr & DEFINED))
 763                         {
 764                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 765                                 reg2 = 0;
 766                         }
 767                         else
 768                         {
 769                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 770
 771                                 if ((reg2 < -16) || (reg2 > 15))
 772                                         error("PC relative overflow");
 773                         }
 774
 775                         BuildRISCIntructionWord(parm, reg2, reg1);
 776                 }
 777                 else
 778                 {
 779                         // JUMP cc, (Rn)
 780                         if (*tok != '(')
 781                                 return MalformedOpcode(0x10);
 782
 783                         tok++;
 784                         reg2 = GetRegister(FU_REGTWO);
 785
 786                         if (*tok != ')')
 787                                 return MalformedOpcode(0x11);
 788
 789                         tok++;
 790                         at_eol();
 791                         BuildRISCIntructionWord(parm, reg2, reg1);
 792                 }
 793
 794                 break;
 795
 796         // Should never get here :-D
 797         default:
 798                 return error("Unknown RISC opcode type");
 799         }
 800
 801         lastOpcode = type;
 802         return 0;
 803 }
 804