Shamusworld >> Repos - rmac/blob - riscasm.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // RISCA.C - GPU/DSP Assembler
   4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source Utilised with the Kind Permission of Landon Dyer
   7 //
   8
   9 #include "riscasm.h"
  10 #include "error.h"
  11 #include "sect.h"
  12 #include "token.h"
  13 #include "expr.h"
  14 #include "direct.h"
  15 #include "mark.h"
  16 #include "amode.h"
  17
  18 #define DEF_MR                          // Declar keyword values
  19 #include "risckw.h"                     // Incl generated risc keywords
  20
  21 #define DEF_KW                          // Declare keyword values
  22 #include "kwtab.h"                      // Incl generated keyword tables & defs
  23
  24
  25 unsigned altbankok = 0;         // Ok to use alternate register bank
  26 unsigned orgactive = 0;         // RISC org directive active
  27 unsigned orgaddr = 0;           // Org'd address
  28 unsigned orgwarning = 0;        // Has an ORG warning been issued
  29 int lastOpcode = -1;            // Last RISC opcode assembled
  30
  31 char reg_err[] = "missing register R0...R31";
  32
  33 // Jaguar Jump Condition Names
  34 char condname[MAXINTERNCC][5] = {
  35         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  36         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  37         "PL", "MI", "F"
  38 };
  39
  40 // Jaguar Jump Condition Numbers
  41 char condnumber[] = {
  42         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  43         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  44 };
  45
  46 struct opcoderecord roptbl[] = {
  47         { MR_ADD,     RI_TWO,    0 },
  48         { MR_ADDC,    RI_TWO,    1 },
  49         { MR_ADDQ,    RI_NUM_32, 2 },
  50         { MR_ADDQT,   RI_NUM_32, 3 },
  51         { MR_SUB,     RI_TWO,    4 },
  52         { MR_SUBC,    RI_TWO,    5 },
  53         { MR_SUBQ,    RI_NUM_32, 6 },
  54         { MR_SUBQT,   RI_NUM_32, 7 },
  55         { MR_NEG,     RI_ONE,    8 },
  56         { MR_AND,     RI_TWO,    9 },
  57         { MR_OR,      RI_TWO,    10 },
  58         { MR_XOR,     RI_TWO,    11 },
  59         { MR_NOT,     RI_ONE,    12 },
  60         { MR_BTST,    RI_NUM_31, 13 },
  61         { MR_BSET,    RI_NUM_31, 14 },
  62         { MR_BCLR,    RI_NUM_31, 15 },
  63         { MR_MULT,    RI_TWO,    16 },
  64         { MR_IMULT,   RI_TWO,    17 },
  65         { MR_IMULTN,  RI_TWO,    18 },
  66         { MR_RESMAC,  RI_ONE,    19 },
  67         { MR_IMACN,   RI_TWO,    20 },
  68         { MR_DIV,     RI_TWO,    21 },
  69         { MR_ABS,     RI_ONE,    22 },
  70         { MR_SH,      RI_TWO,    23 },
  71         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  72         { MR_SHRQ,    RI_NUM_32, 25 },
  73         { MR_SHA,     RI_TWO,    26 },
  74         { MR_SHARQ,   RI_NUM_32, 27 },
  75         { MR_ROR,     RI_TWO,    28 },
  76         { MR_RORQ,    RI_NUM_32, 29 },
  77         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  78         { MR_CMP,     RI_TWO,    30 },
  79         { MR_CMPQ,    RI_NUM_15, 31 },
  80         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  81         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  82         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  83         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  84         { MR_MOVEQ,   RI_NUM_31, 35 },
  85         { MR_MOVETA,  RI_TWO,    36 },
  86         { MR_MOVEFA,  RI_TWO,    37 },
  87         { MR_MOVEI,   RI_MOVEI,  38 },
  88         { MR_LOADB,   RI_LOADN,  39 },
  89         { MR_LOADW,   RI_LOADN,  40 },
  90         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  91         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  92         { MR_STOREB,  RI_STOREN, 45 },
  93         { MR_STOREW,  RI_STOREN, 46 },
  94         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  95         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  96         { MR_JUMP,    RI_JUMP,   52 },
  97         { MR_JR,      RI_JR,     53 },
  98         { MR_MMULT,   RI_TWO,    54 },
  99         { MR_MTOI,    RI_TWO,    55 },
 100         { MR_NORMI,   RI_TWO,    56 },
 101         { MR_NOP,     RI_NONE,   57 },
 102         { MR_SAT24,   RI_ONE,    62 },
 103         { MR_UNPACK,  RI_ONE,    63 + GPUONLY },
 104         { MR_PACK,    RI_ONE,    63 + GPUONLY },
 105         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 106         { MR_MOVE,    RI_MOVE,   0 },
 107         { MR_LOAD,    RI_LOAD,   0 },
 108         { MR_STORE,   RI_STORE,  0 }
 109 };
 110
 111
 112 //
 113 // Convert a String to Uppercase
 114 //
 115 void strtoupper(char * s)
 116 {
 117         while (*s)
 118                 *s++ &= 0xDF;
 119 }
 120
 121
 122 //
 123 // Function to return "malformed expression" error
 124 // This is done mainly to remove a bunch of GOTO statements in the parser
 125 //
 126 static inline int MalformedOpcode(int signal)
 127 {
 128         char buf[16];
 129         sprintf(buf, "%02X", signal);
 130         errors("Malformed opcode [internal $%s]", buf);
 131         return ERROR;
 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                 orgwarning = 1;
 145         }
 146
 147         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 148         D_word(value);
 149 }
 150
 151
 152 //
 153 // Get a RISC Register
 154 //
 155 int GetRegister(WORD rattr)
 156 {
 157         VALUE eval;                                     // Expression value
 158         WORD eattr;                                     // Expression attributes
 159         SYM * esym;                                     // External symbol involved in expr.
 160         TOKEN r_expr[EXPRSIZE];         // Expression token list
 161
 162         // Evaluate what's in the global "tok" buffer
 163         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 164                 // Hmm, the evaluator should report the error to us...
 165 //              return MalformedOpcode(0x00);
 166                 return ERROR;
 167
 168         if ((challoc - ch_size) < 4)
 169                 chcheck(4L);
 170
 171         if (!(eattr & DEFINED))
 172         {
 173                 fixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 174                 return 0;
 175         }
 176
 177         // If we got a register in range (0-31), return it
 178         if ((eval >= 0) && (eval <= 31))
 179                 return eval;
 180
 181         // Otherwise, it's out of range & we flag an error
 182         error(reg_err);
 183         return ERROR;
 184 }
 185
 186
 187 //
 188 // Do RISC Code Generation
 189 //
 190 int GenerateRISCCode(int state)
 191 {
 192         int reg1;                                       // Register 1
 193         int reg2;                                       // Register 2
 194         int val = 0;                            // Constructed value
 195         char scratch[80];
 196         SYM * ccsym;
 197         SYM * sy;
 198         int i, commaFound;
 199         TOKEN * t;
 200         WORD attrflg;
 201         int indexed;                            // Indexed register flag
 202
 203         VALUE eval;                                     // Expression value
 204         WORD eattr;                                     // Expression attributes
 205         SYM * esym;                                     // External symbol involved in expr.
 206         TOKEN r_expr[EXPRSIZE];         // Expression token list
 207
 208         // Get opcode parameter and type
 209         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 210         unsigned type = roptbl[state - 3000].typ;
 211
 212         // Detect whether the opcode parmeter passed determines that the opcode is
 213         // specific to only one of the RISC processors and ensure it is legal in
 214         // the current code section. If not then show error and return.
 215         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 216         {
 217                 error("Opcode is not valid in this code section");
 218                 return ERROR;
 219         }
 220
 221         // Process RISC opcode
 222         switch (type)
 223         {
 224         // No operand instructions
 225         // NOP (57)
 226         case RI_NONE:
 227                 BuildRISCIntructionWord(parm, 0, 0);
 228                 break;
 229
 230         // Single operand instructions (Rd)
 231         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S, UNPACK
 232         case RI_ONE:
 233                 reg2 = GetRegister(FU_REGTWO);
 234                 at_eol();
 235                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 236                 break;
 237
 238         // Two operand instructions (Rs,Rd)
 239         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT, MMULT,
 240         // MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 241         case RI_TWO:
 242                 if (parm == 37)
 243                         altbankok = 1;                      // MOVEFA
 244
 245                 reg1 = GetRegister(FU_REGONE);
 246                 CHECK_COMMA;
 247
 248                 if (parm == 36)
 249                         altbankok = 1;                      // MOVETA
 250
 251                 reg2 = GetRegister(FU_REGTWO);
 252                 at_eol();
 253                 BuildRISCIntructionWord(parm, reg1, reg2);
 254                 break;
 255
 256         // Numeric operand (n,Rd) where n = -16..+15
 257         // CMPQ
 258         case RI_NUM_15:
 259
 260         // Numeric operand (n,Rd) where n = 0..31
 261         // BCLR, BSET, BTST, MOVEQ
 262         case RI_NUM_31:
 263
 264         // Numeric operand (n,Rd) where n = 1..32
 265         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ, RORQ
 266         case RI_NUM_32:
 267                 switch (type)
 268                 {
 269                 case RI_NUM_15:
 270                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 271                         break;
 272                 default:
 273                 case RI_NUM_31:
 274                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 275                         break;
 276                 case RI_NUM_32:
 277                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 278                         break;
 279                 }
 280
 281                 if (parm & SUB32)
 282                         attrflg |= FU_SUB32;
 283
 284                 if (*tok != '#')
 285                         return MalformedOpcode(0x01);
 286
 287                 tok++;
 288
 289                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 290                         return MalformedOpcode(0x02);
 291
 292                 if ((challoc - ch_size) < 4)
 293                         chcheck(4L);
 294
 295                 if (!(eattr & DEFINED))
 296                 {
 297                         fixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 298                         reg1 = 0;
 299                 }
 300                 else
 301                 {
 302                         if ((int)eval < reg1 || (int)eval > reg2)
 303                         {
 304                                 error("constant out of range");
 305                                 return ERROR;
 306                         }
 307
 308                         if (parm & SUB32)
 309                                 reg1 = 32 - eval;
 310                         else if (type == RI_NUM_32)
 311                                 reg1 = (reg1 == 32 ? 0 : eval);
 312                         else
 313                                 reg1 = eval;
 314                 }
 315
 316                 CHECK_COMMA;
 317                 reg2 = GetRegister(FU_REGTWO);
 318                 at_eol();
 319                 BuildRISCIntructionWord(parm, reg1, reg2);
 320                 break;
 321
 322         // Move Immediate--n,Rn--n in Second Word
 323         case RI_MOVEI:
 324                 if (*tok != '#')
 325                         return MalformedOpcode(0x03);
 326
 327                 tok++;
 328
 329                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 330                         return MalformedOpcode(0x04);
 331
 332                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 333                 {
 334                         if (legacy_flag)
 335                         {
 336                                 // User doesn't care, emit a NOP to fix
 337                                 BuildRISCIntructionWord(57, 0, 0);
 338                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 339                         }
 340                         else
 341                                 warn("MOVEI immediately follows JUMP");
 342                 }
 343
 344                 if ((challoc - ch_size) < 4)
 345                         chcheck(4L);
 346
 347                 if (!(eattr & DEFINED))
 348                 {
 349                         fixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 350                         eval = 0;
 351                 }
 352                 else
 353                 {
 354                         if (eattr & TDB)
 355 //{
 356 //printf("risca: Doing rmark for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 357                                 rmark(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 358 //}
 359                 }
 360
 361                 val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 362                 CHECK_COMMA;
 363                 reg2 = GetRegister(FU_REGTWO);
 364                 at_eol();
 365                 D_word((((parm & 0x3F) << 10) + reg2));
 366                 D_long(val);
 367                 break;
 368
 369         // PC,Rd or Rs,Rd
 370         case RI_MOVE:
 371                 if (*tok == KW_PC)
 372                 {
 373                         parm = 51;
 374                         reg1 = 0;
 375                         tok++;
 376                 }
 377                 else
 378                 {
 379                         parm = 34;
 380                         reg1 = GetRegister(FU_REGONE);
 381                 }
 382
 383                 CHECK_COMMA;
 384                 reg2 = GetRegister(FU_REGTWO);
 385                 at_eol();
 386                 BuildRISCIntructionWord(parm, reg1, reg2);
 387                 break;
 388
 389         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 390         case RI_LOAD:
 391                 indexed = 0;
 392                 parm = 41;
 393
 394                 if (*tok != '(')
 395                         return MalformedOpcode(0x05);
 396
 397                 tok++;
 398
 399                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 400                         indexed = (*tok - KW_R0);
 401
 402                 if (*tok == SYMBOL)
 403                 {
 404 //                      sy = lookup((char *)tok[1], LABEL, 0);
 405                         sy = lookup(string[tok[1]], LABEL, 0);
 406
 407                         if (!sy)
 408                         {
 409                                 error(reg_err);
 410                                 return ERROR;
 411                         }
 412
 413                         if (sy->sattre & EQUATEDREG)
 414                         {
 415                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 416                                         && (*(tok + 2) != ')'))
 417                                 {
 418                                         indexed = (sy->svalue & 0x1F);
 419                                         tok++;
 420                                 }
 421                         }
 422                 }
 423
 424                 if (!indexed)
 425                 {
 426                         reg1 = GetRegister(FU_REGONE);
 427                 }
 428                 else
 429                 {
 430                         reg1 = indexed;
 431                         indexed = 0;
 432                         tok++;
 433
 434                         if (*tok == '+')
 435                         {
 436                                 parm = (WORD)(reg1 - 14 + 58);
 437                                 tok++;
 438
 439                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 440                                         indexed = 1;
 441
 442                                 if (*tok == SYMBOL)
 443                                 {
 444 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 445                                         sy = lookup(string[tok[1]], LABEL, 0);
 446
 447                                         if (!sy)
 448                                         {
 449                                                 error(reg_err);
 450                                                 return ERROR;
 451                                         }
 452
 453                                         if (sy->sattre & EQUATEDREG)
 454                                                 indexed = 1;
 455                                 }
 456
 457                                 if (indexed)
 458                                 {
 459                                         reg1 = GetRegister(FU_REGONE);
 460                                 }
 461                                 else
 462                                 {
 463                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 464                                                 return MalformedOpcode(0x06);
 465
 466                                         if ((challoc - ch_size) < 4)
 467                                                 chcheck(4L);
 468
 469                                         if (!(eattr & DEFINED))
 470                                         {
 471                                                 error("constant expected after '+'");
 472                                                 return ERROR;
 473                                         }
 474
 475                                         reg1 = eval;
 476
 477                                         if (reg1 == 0)
 478                                         {
 479                                                 reg1 = 14 + (parm - 58);
 480                                                 parm = 41;
 481                                                 warn("NULL offset in LOAD ignored");
 482                                         }
 483                                         else
 484                                         {
 485                                                 if (reg1 < 1 || reg1 > 32)
 486                                                 {
 487                                                         error("constant in LOAD out of range");
 488                                                         return ERROR;
 489                                                 }
 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((char *)tok[1], LABEL, 0);
 532                         sy = lookup(string[tok[1]], LABEL, 0);
 533
 534                         if (!sy)
 535                         {
 536                                 error(reg_err);
 537                                 return ERROR;
 538                         }
 539
 540                         if (sy->sattre & EQUATEDREG)
 541                         {
 542                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 543                                         && (*(tok + 2) != ')'))
 544                                 {
 545                                         indexed = (sy->svalue & 0x1F);
 546                                         tok++;
 547                                 }
 548                         }
 549                 }
 550
 551                 if (!indexed)
 552                 {
 553                         reg2 = GetRegister(FU_REGTWO);
 554                 }
 555                 else
 556                 {
 557                         reg2 = indexed;
 558                         indexed = 0;
 559                         tok++;
 560
 561                         if (*tok == '+')
 562                         {
 563                                 parm = (WORD)(reg2 - 14 + 60);
 564                                 tok++;
 565
 566                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 567                                         indexed = 1;
 568
 569                                 if (*tok == SYMBOL)
 570                                 {
 571 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 572                                         sy = lookup(string[tok[1]], LABEL, 0);
 573
 574                                         if (!sy)
 575                                         {
 576                                                 error(reg_err);
 577                                                 return ERROR;
 578                                         }
 579
 580                                         if (sy->sattre & EQUATEDREG)
 581                                                 indexed = 1;
 582                                 }
 583
 584                                 if (indexed)
 585                                 {
 586                                         reg2 = GetRegister(FU_REGTWO);
 587                                 }
 588                                 else
 589                                 {
 590                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 591                                                 return MalformedOpcode(0x09);
 592
 593                                         if ((challoc - ch_size) < 4)
 594                                                 chcheck(4L);
 595
 596                                         if (!(eattr & DEFINED))
 597                                         {
 598                                                 fixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 599                                                 reg2 = 0;
 600                                         }
 601                                         else
 602                                         {
 603                                                 reg2 = eval;
 604
 605                                                 if (reg2 == 0)
 606                                                 {
 607                                                         reg2 = 14 + (parm - 60);
 608                                                         parm = 47;
 609                                                         warn("NULL offset in STORE ignored");
 610                                                 }
 611                                                 else
 612                                                 {
 613                                                         if (reg2 < 1 || reg2 > 32)
 614                                                         {
 615                                                                 error("constant in STORE out of range");
 616                                                                 return ERROR;
 617                                                         }
 618
 619                                                         if (reg2 == 32)
 620                                                                 reg2 = 0;
 621
 622                                                         parm = (WORD)(parm - 60 + 49);
 623                                                 }
 624                                         }
 625                                 }
 626                         }
 627                         else
 628                         {
 629                                 reg2 = GetRegister(FU_REGTWO);
 630                         }
 631                 }
 632
 633                 if (*tok != ')')
 634                         return MalformedOpcode(0x0A);
 635
 636                 tok++;
 637                 at_eol();
 638                 BuildRISCIntructionWord(parm, reg2, reg1);
 639                 break;
 640
 641         // LOADB/LOADP/LOADW (Rn),Rn
 642         case RI_LOADN:
 643                 if (*tok != '(')
 644                         return MalformedOpcode(0x0B);
 645
 646                 tok++;
 647                 reg1 = GetRegister(FU_REGONE);
 648
 649                 if (*tok != ')')
 650                         return MalformedOpcode(0x0C);
 651
 652                 tok++;
 653                 CHECK_COMMA;
 654                 reg2 = GetRegister(FU_REGTWO);
 655                 at_eol();
 656                 BuildRISCIntructionWord(parm, reg1, reg2);
 657                 break;
 658
 659         // STOREB/STOREP/STOREW Rn,(Rn)
 660         case RI_STOREN:
 661                 reg1 = GetRegister(FU_REGONE);
 662                 CHECK_COMMA;
 663
 664                 if (*tok != '(')
 665                         return MalformedOpcode(0x0D);
 666
 667                 tok++;
 668                 reg2 = GetRegister(FU_REGTWO);
 669
 670                 if (*tok != ')')
 671                         return MalformedOpcode(0x0E);
 672
 673                 tok++;
 674                 at_eol();
 675                 BuildRISCIntructionWord(parm, reg2, reg1);
 676                 break;
 677
 678         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 679         case RI_JR:
 680
 681         // Jump Absolute - cc,(Rs) - reg2=cc
 682         case RI_JUMP:
 683                 // Check to see if there is a comma in the token string. If not then
 684                 // the JR or JUMP should default to 0, Jump Always
 685                 commaFound = 0;
 686
 687                 for(t=tok; *t!=EOL; t++)
 688                 {
 689                         if (*t == ',')
 690                         {
 691                                 commaFound = 1;
 692                                 break;
 693                         }
 694                 }
 695
 696                 if (commaFound)
 697                 {
 698                         if (*tok == CONST)
 699                         {
 700                                 // CC using a constant number
 701                                 tok++;
 702                                 val = *tok;
 703                                 tok++;
 704                                 CHECK_COMMA;
 705                         }
 706                         else if (*tok == SYMBOL)
 707                         {
 708                                 val = 99;
 709 //                              strcpy(scratch, (char *)tok[1]);
 710                                 strcpy(scratch, string[tok[1]]);
 711                                 strtoupper(scratch);
 712
 713                                 for(i=0; i<MAXINTERNCC; i++)
 714                                 {
 715                                         // Look for the condition code & break if found
 716                                         if (strcmp(condname[i], scratch) == 0)
 717                                         {
 718                                                 val = condnumber[i];
 719                                                 break;
 720                                         }
 721                                 }
 722
 723                                 // Standard CC was not found, look for an equated one
 724                                 if (val == 99)
 725                                 {
 726 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 727                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 728
 729                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 730                                         {
 731                                                 val = ccsym->svalue;
 732                                         }
 733                                         else
 734                                         {
 735                                                 error("unknown condition code");
 736                                                 return ERROR;
 737                                         }
 738                                 }
 739
 740                                 tok += 2;
 741                                 CHECK_COMMA;
 742                         }
 743                         else if (*tok == '(')
 744                         {
 745                                 // Set CC to "Jump Always"
 746                                 val = 0;
 747                         }
 748                 }
 749                 else
 750                 {
 751                         // Set CC to "Jump Always"
 752                         val = 0;
 753                 }
 754
 755                 if (val < 0 || val > 31)
 756                 {
 757                         error("condition constant out of range");
 758                         return ERROR;
 759                 }
 760
 761                 // Store condition code
 762                 reg1 = val;
 763
 764                 if (type == RI_JR)
 765                 {
 766                         // JR cc,n
 767                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 768                                 return MalformedOpcode(0x0F);
 769
 770                         if ((challoc - ch_size) < 4)
 771                                 chcheck(4L);
 772
 773                         if (!(eattr & DEFINED))
 774                         {
 775                                 fixup(FU_WORD | FU_JR, sloc, r_expr);
 776                                 reg2 = 0;
 777                         }
 778                         else
 779                         {
 780                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 781
 782                                 if ((reg2 < -16) || (reg2 > 15))
 783                                         error("PC relative overflow");
 784                         }
 785
 786                         BuildRISCIntructionWord(parm, reg2, reg1);
 787                 }
 788                 else
 789                 {
 790                         // JUMP cc, (Rn)
 791                         if (*tok != '(')
 792                                 return MalformedOpcode(0x10);
 793
 794                         tok++;
 795                         reg2 = GetRegister(FU_REGTWO);
 796
 797                         if (*tok != ')')
 798                                 return MalformedOpcode(0x11);
 799
 800                         tok++;
 801                         at_eol();
 802                         BuildRISCIntructionWord(parm, reg2, reg1);
 803                 }
 804
 805                 break;
 806
 807         // Should never get here :-D
 808         default:
 809                 error("Unknown risc opcode type");
 810                 return ERROR;
 811         }
 812
 813         lastOpcode = type;
 814         return 0;
 815 }
 816