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,
 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                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 327                         return MalformedOpcode(0x04);
 328
 329                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 330                 {
 331                         if (legacy_flag)
 332                         {
 333                                 // User doesn't care, emit a NOP to fix
 334                                 BuildRISCIntructionWord(57, 0, 0);
 335                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 336                         }
 337                         else
 338                                 warn("MOVEI immediately follows JUMP");
 339                 }
 340
 341                 if ((challoc - ch_size) < 4)
 342                         chcheck(4L);
 343
 344                 if (!(eattr & DEFINED))
 345                 {
 346                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 347                         eval = 0;
 348                 }
 349                 else
 350                 {
 351                         if (eattr & TDB)
 352 //{
 353 //printf("RISCASM: Doing rmark for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 354                                 rmark(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 355 //}
 356                 }
 357
 358                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 359                 CHECK_COMMA;
 360                 reg2 = GetRegister(FU_REGTWO);
 361                 at_eol();
 362                 D_word((((parm & 0x3F) << 10) + reg2));
 363                 D_long(val);
 364                 break;
 365
 366         // PC,Rd or Rs,Rd
 367         case RI_MOVE:
 368                 if (*tok == KW_PC)
 369                 {
 370                         parm = 51;
 371                         reg1 = 0;
 372                         tok++;
 373                 }
 374                 else
 375                 {
 376                         parm = 34;
 377                         reg1 = GetRegister(FU_REGONE);
 378                 }
 379
 380                 CHECK_COMMA;
 381                 reg2 = GetRegister(FU_REGTWO);
 382                 at_eol();
 383                 BuildRISCIntructionWord(parm, reg1, reg2);
 384                 break;
 385
 386         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 387         case RI_LOAD:
 388                 indexed = 0;
 389                 parm = 41;
 390
 391                 if (*tok != '(')
 392                         return MalformedOpcode(0x05);
 393
 394                 tok++;
 395
 396                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 397                         indexed = (*tok - KW_R0);
 398
 399                 if (*tok == SYMBOL)
 400                 {
 401 //                      sy = lookup((char *)tok[1], LABEL, 0);
 402                         sy = lookup(string[tok[1]], LABEL, 0);
 403
 404                         if (!sy)
 405                         {
 406                                 error(reg_err);
 407                                 return ERROR;
 408                         }
 409
 410                         if (sy->sattre & EQUATEDREG)
 411                         {
 412                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 413                                         && (*(tok + 2) != ')'))
 414                                 {
 415                                         indexed = (sy->svalue & 0x1F);
 416                                         tok++;
 417                                 }
 418                         }
 419                 }
 420
 421                 if (!indexed)
 422                 {
 423                         reg1 = GetRegister(FU_REGONE);
 424                 }
 425                 else
 426                 {
 427                         reg1 = indexed;
 428                         indexed = 0;
 429                         tok++;
 430
 431                         if (*tok == '+')
 432                         {
 433                                 parm = (WORD)(reg1 - 14 + 58);
 434                                 tok++;
 435
 436                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 437                                         indexed = 1;
 438
 439                                 if (*tok == SYMBOL)
 440                                 {
 441 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 442                                         sy = lookup(string[tok[1]], LABEL, 0);
 443
 444                                         if (!sy)
 445                                         {
 446                                                 error(reg_err);
 447                                                 return ERROR;
 448                                         }
 449
 450                                         if (sy->sattre & EQUATEDREG)
 451                                                 indexed = 1;
 452                                 }
 453
 454                                 if (indexed)
 455                                 {
 456                                         reg1 = GetRegister(FU_REGONE);
 457                                 }
 458                                 else
 459                                 {
 460                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 461                                                 return MalformedOpcode(0x06);
 462
 463                                         if ((challoc - ch_size) < 4)
 464                                                 chcheck(4L);
 465
 466                                         if (!(eattr & DEFINED))
 467                                                 return error("constant expected after '+'");
 468
 469                                         reg1 = eval;
 470
 471                                         if (reg1 == 0)
 472                                         {
 473                                                 reg1 = 14 + (parm - 58);
 474                                                 parm = 41;
 475                                                 warn("NULL offset in LOAD ignored");
 476                                         }
 477                                         else
 478                                         {
 479                                                 if (reg1 < 1 || reg1 > 32)
 480                                                         return error("constant in LOAD out of range");
 481
 482                                                 if (reg1 == 32)
 483                                                         reg1 = 0;
 484
 485                                                 parm = (WORD)(parm - 58 + 43);
 486                                         }
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 reg1 = GetRegister(FU_REGONE);
 492                         }
 493                 }
 494
 495                 if (*tok != ')')
 496                         return MalformedOpcode(0x07);
 497
 498                 tok++;
 499                 CHECK_COMMA;
 500                 reg2 = GetRegister(FU_REGTWO);
 501                 at_eol();
 502                 BuildRISCIntructionWord(parm, reg1, reg2);
 503                 break;
 504
 505         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 506         case RI_STORE:
 507                 parm = 47;
 508                 reg1 = GetRegister(FU_REGONE);
 509                 CHECK_COMMA;
 510
 511                 if (*tok != '(')
 512                         return MalformedOpcode(0x08);
 513
 514                 tok++;
 515                 indexed = 0;
 516
 517                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 518                         indexed = (*tok - KW_R0);
 519
 520                 if (*tok == SYMBOL)
 521                 {
 522                         sy = lookup(string[tok[1]], LABEL, 0);
 523
 524                         if (!sy)
 525                         {
 526                                 error(reg_err);
 527                                 return ERROR;
 528                         }
 529
 530                         if (sy->sattre & EQUATEDREG)
 531                         {
 532                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 533                                         && (*(tok + 2) != ')'))
 534                                 {
 535                                         indexed = (sy->svalue & 0x1F);
 536                                         tok++;
 537                                 }
 538                         }
 539                 }
 540
 541                 if (!indexed)
 542                 {
 543                         reg2 = GetRegister(FU_REGTWO);
 544                 }
 545                 else
 546                 {
 547                         reg2 = indexed;
 548                         indexed = 0;
 549                         tok++;
 550
 551                         if (*tok == '+')
 552                         {
 553                                 parm = (WORD)(reg2 - 14 + 60);
 554                                 tok++;
 555
 556                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 557                                         indexed = 1;
 558
 559                                 if (*tok == SYMBOL)
 560                                 {
 561                                         sy = lookup(string[tok[1]], LABEL, 0);
 562
 563                                         if (!sy)
 564                                         {
 565                                                 error(reg_err);
 566                                                 return ERROR;
 567                                         }
 568
 569                                         if (sy->sattre & EQUATEDREG)
 570                                                 indexed = 1;
 571                                 }
 572
 573                                 if (indexed)
 574                                 {
 575                                         reg2 = GetRegister(FU_REGTWO);
 576                                 }
 577                                 else
 578                                 {
 579                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 580                                                 return MalformedOpcode(0x09);
 581
 582                                         if ((challoc - ch_size) < 4)
 583                                                 chcheck(4L);
 584
 585                                         if (!(eattr & DEFINED))
 586                                         {
 587                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 588                                                 reg2 = 0;
 589                                         }
 590                                         else
 591                                         {
 592                                                 reg2 = eval;
 593
 594                                                 if (reg2 == 0)
 595                                                 {
 596                                                         reg2 = 14 + (parm - 60);
 597                                                         parm = 47;
 598                                                         warn("NULL offset in STORE ignored");
 599                                                 }
 600                                                 else
 601                                                 {
 602                                                         if (reg2 < 1 || reg2 > 32)
 603                                                                 return error("constant in STORE out of range");
 604
 605                                                         if (reg2 == 32)
 606                                                                 reg2 = 0;
 607
 608                                                         parm = (WORD)(parm - 60 + 49);
 609                                                 }
 610                                         }
 611                                 }
 612                         }
 613                         else
 614                         {
 615                                 reg2 = GetRegister(FU_REGTWO);
 616                         }
 617                 }
 618
 619                 if (*tok != ')')
 620                         return MalformedOpcode(0x0A);
 621
 622                 tok++;
 623                 at_eol();
 624                 BuildRISCIntructionWord(parm, reg2, reg1);
 625                 break;
 626
 627         // LOADB/LOADP/LOADW (Rn),Rn
 628         case RI_LOADN:
 629                 if (*tok != '(')
 630                         return MalformedOpcode(0x0B);
 631
 632                 tok++;
 633                 reg1 = GetRegister(FU_REGONE);
 634
 635                 if (*tok != ')')
 636                         return MalformedOpcode(0x0C);
 637
 638                 tok++;
 639                 CHECK_COMMA;
 640                 reg2 = GetRegister(FU_REGTWO);
 641                 at_eol();
 642                 BuildRISCIntructionWord(parm, reg1, reg2);
 643                 break;
 644
 645         // STOREB/STOREP/STOREW Rn,(Rn)
 646         case RI_STOREN:
 647                 reg1 = GetRegister(FU_REGONE);
 648                 CHECK_COMMA;
 649
 650                 if (*tok != '(')
 651                         return MalformedOpcode(0x0D);
 652
 653                 tok++;
 654                 reg2 = GetRegister(FU_REGTWO);
 655
 656                 if (*tok != ')')
 657                         return MalformedOpcode(0x0E);
 658
 659                 tok++;
 660                 at_eol();
 661                 BuildRISCIntructionWord(parm, reg2, reg1);
 662                 break;
 663
 664         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 665         case RI_JR:
 666
 667         // Jump Absolute - cc,(Rs) - reg2=cc
 668         case RI_JUMP:
 669                 // Check to see if there is a comma in the token string. If not then
 670                 // the JR or JUMP should default to 0, Jump Always
 671                 commaFound = 0;
 672
 673                 for(t=tok; *t!=EOL; t++)
 674                 {
 675                         if (*t == ',')
 676                         {
 677                                 commaFound = 1;
 678                                 break;
 679                         }
 680                 }
 681
 682                 if (commaFound)
 683                 {
 684                         if (*tok == CONST)
 685                         {
 686                                 // CC using a constant number
 687                                 tok++;
 688                                 val = *tok;
 689                                 tok++;
 690                                 CHECK_COMMA;
 691                         }
 692                         else if (*tok == SYMBOL)
 693                         {
 694                                 val = 99;
 695 //                              strcpy(scratch, (char *)tok[1]);
 696                                 strcpy(scratch, string[tok[1]]);
 697                                 strtoupper(scratch);
 698
 699                                 for(i=0; i<MAXINTERNCC; i++)
 700                                 {
 701                                         // Look for the condition code & break if found
 702                                         if (strcmp(condname[i], scratch) == 0)
 703                                         {
 704                                                 val = condnumber[i];
 705                                                 break;
 706                                         }
 707                                 }
 708
 709                                 // Standard CC was not found, look for an equated one
 710                                 if (val == 99)
 711                                 {
 712 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 713                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 714
 715                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 716                                         {
 717                                                 val = ccsym->svalue;
 718                                         }
 719                                         else
 720                                                 return error("unknown condition code");
 721                                 }
 722
 723                                 tok += 2;
 724                                 CHECK_COMMA;
 725                         }
 726                         else if (*tok == '(')
 727                         {
 728                                 // Set CC to "Jump Always"
 729                                 val = 0;
 730                         }
 731                 }
 732                 else
 733                 {
 734                         // Set CC to "Jump Always"
 735                         val = 0;
 736                 }
 737
 738                 if (val < 0 || val > 31)
 739                         return error("condition constant out of range");
 740
 741                 // Store condition code
 742                 reg1 = val;
 743
 744                 if (type == RI_JR)
 745                 {
 746                         // JR cc,n
 747                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 748                                 return MalformedOpcode(0x0F);
 749
 750                         if ((challoc - ch_size) < 4)
 751                                 chcheck(4L);
 752
 753                         if (!(eattr & DEFINED))
 754                         {
 755                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 756                                 reg2 = 0;
 757                         }
 758                         else
 759                         {
 760                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 761
 762                                 if ((reg2 < -16) || (reg2 > 15))
 763                                         error("PC relative overflow");
 764                         }
 765
 766                         BuildRISCIntructionWord(parm, reg2, reg1);
 767                 }
 768                 else
 769                 {
 770                         // JUMP cc, (Rn)
 771                         if (*tok != '(')
 772                                 return MalformedOpcode(0x10);
 773
 774                         tok++;
 775                         reg2 = GetRegister(FU_REGTWO);
 776
 777                         if (*tok != ')')
 778                                 return MalformedOpcode(0x11);
 779
 780                         tok++;
 781                         at_eol();
 782                         BuildRISCIntructionWord(parm, reg2, reg1);
 783                 }
 784
 785                 break;
 786
 787         // Should never get here :-D
 788         default:
 789                 return error("Unknown RISC opcode type");
 790         }
 791
 792         lastOpcode = type;
 793         return 0;
 794 }
 795