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 - 2017 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 "amode.h"
  11 #include "direct.h"
  12 #include "error.h"
  13 #include "expr.h"
  14 #include "mark.h"
  15 #include "procln.h"
  16 #include "sect.h"
  17 #include "token.h"
  18
  19 #define DEF_MR                          // Declare keyword values
  20 #include "risckw.h"                     // Incl. generated risc keywords
  21
  22 #define DEF_KW                          // Declare keyword values
  23 #include "kwtab.h"                      // Incl. generated keyword tables & defs
  24
  25
  26 unsigned altbankok = 0;         // Ok to use alternate register bank
  27 unsigned orgactive = 0;         // RISC/6502 org directive active
  28 unsigned orgaddr = 0;           // Org'd address
  29 unsigned orgwarning = 0;        // Has an ORG warning been issued
  30 int lastOpcode = -1;            // Last RISC opcode assembled
  31 uint8_t riscImmTokenSeen;       // The '#' (immediate) token was seen
  32
  33 const char reg_err[] = "missing register R0...R31";
  34
  35 // Jaguar jump condition names
  36 const char condname[MAXINTERNCC][5] = {
  37         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  38         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  39         "PL", "MI", "F"
  40 };
  41
  42 // Jaguar jump condition numbers
  43 const char condnumber[] = {
  44         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  45         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  46 };
  47
  48 const struct opcoderecord roptbl[] = {
  49         { MR_ADD,     RI_TWO,    0 },
  50         { MR_ADDC,    RI_TWO,    1 },
  51         { MR_ADDQ,    RI_NUM_32, 2 },
  52         { MR_ADDQT,   RI_NUM_32, 3 },
  53         { MR_SUB,     RI_TWO,    4 },
  54         { MR_SUBC,    RI_TWO,    5 },
  55         { MR_SUBQ,    RI_NUM_32, 6 },
  56         { MR_SUBQT,   RI_NUM_32, 7 },
  57         { MR_NEG,     RI_ONE,    8 },
  58         { MR_AND,     RI_TWO,    9 },
  59         { MR_OR,      RI_TWO,    10 },
  60         { MR_XOR,     RI_TWO,    11 },
  61         { MR_NOT,     RI_ONE,    12 },
  62         { MR_BTST,    RI_NUM_31, 13 },
  63         { MR_BSET,    RI_NUM_31, 14 },
  64         { MR_BCLR,    RI_NUM_31, 15 },
  65         { MR_MULT,    RI_TWO,    16 },
  66         { MR_IMULT,   RI_TWO,    17 },
  67         { MR_IMULTN,  RI_TWO,    18 },
  68         { MR_RESMAC,  RI_ONE,    19 },
  69         { MR_IMACN,   RI_TWO,    20 },
  70         { MR_DIV,     RI_TWO,    21 },
  71         { MR_ABS,     RI_ONE,    22 },
  72         { MR_SH,      RI_TWO,    23 },
  73         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  74         { MR_SHRQ,    RI_NUM_32, 25 },
  75         { MR_SHA,     RI_TWO,    26 },
  76         { MR_SHARQ,   RI_NUM_32, 27 },
  77         { MR_ROR,     RI_TWO,    28 },
  78         { MR_RORQ,    RI_NUM_32, 29 },
  79         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  80         { MR_CMP,     RI_TWO,    30 },
  81         { MR_CMPQ,    RI_NUM_15, 31 },
  82         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  83         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  84         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  85         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  86         { MR_MOVEQ,   RI_NUM_31, 35 },
  87         { MR_MOVETA,  RI_TWO,    36 },
  88         { MR_MOVEFA,  RI_TWO,    37 },
  89         { MR_MOVEI,   RI_MOVEI,  38 },
  90         { MR_LOADB,   RI_LOADN,  39 },
  91         { MR_LOADW,   RI_LOADN,  40 },
  92         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  93         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  94         { MR_STOREB,  RI_STOREN, 45 },
  95         { MR_STOREW,  RI_STOREN, 46 },
  96         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  97         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  98         { MR_JUMP,    RI_JUMP,   52 },
  99         { MR_JR,      RI_JR,     53 },
 100         { MR_MMULT,   RI_TWO,    54 },
 101         { MR_MTOI,    RI_TWO,    55 },
 102         { MR_NORMI,   RI_TWO,    56 },
 103         { MR_NOP,     RI_NONE,   57 },
 104         { MR_SAT24,   RI_ONE,    62 },
 105         { MR_UNPACK,  RI_ONE,    63 + GPUONLY | (0 << 6) },
 106         { MR_PACK,    RI_ONE,    63 + GPUONLY | (1 << 6) },
 107         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 108         { MR_MOVE,    RI_MOVE,   0 },
 109         { MR_LOAD,    RI_LOAD,   0 },
 110         { MR_STORE,   RI_STORE,  0 }
 111 };
 112
 113
 114 //
 115 // Convert a string to uppercase
 116 //
 117 void strtoupper(char * s)
 118 {
 119         while (*s)
 120                 *s++ &= 0xDF;
 121 }
 122
 123
 124 //
 125 // Function to return "malformed expression" error
 126 // This is done mainly to remove a bunch of GOTO statements in the parser
 127 //
 128 static inline int MalformedOpcode(int signal)
 129 {
 130         char buf[16];
 131         sprintf(buf, "%02X", signal);
 132         return errors("Malformed opcode [internal $%s]", buf);
 133 }
 134
 135 //
 136 // Function to return "Illegal Indexed Register" error
 137 // Anyone trying to index something other than R14 or R15
 138 //
 139 static inline int IllegalIndexedRegister(int reg)
 140 {
 141     char buf[16];
 142     sprintf(buf, "%d", reg - KW_R0);
 143     return errors("Attempted index reference with non-indexable register (r%s)", buf);
 144 }
 145
 146 //
 147 // Function to return "Illegal Indexed Register" error for EQUR scenarios
 148 // Trying to use register value within EQUR that isn't 14 or 15
 149 //
 150 static inline int IllegalIndexedRegisterEqur(SYM *sy)
 151 {
 152     //char buf[160];
 153     char *buf = NULL;
 154     buf = (char *)malloc((strlen(sy->sname) + 7) * sizeof(char));
 155     if (NULL != buf) {
 156         sprintf(buf, "%s = r%d",sy->sname, sy->svalue);
 157         return errors("Attempted index reference with non-indexable register within EQUR (%s)", buf);
 158     }
 159     return errors("Unable to allocate memory! (IllegalIndexRegisterEqur)", "OOPS");
 160 }
 161
 162 //
 163 // Build RISC instruction word
 164 //
 165 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 166 {
 167         // Check for absolute address setting
 168         if (!orgwarning && !orgactive)
 169         {
 170                 warn("RISC code generated with no origin defined");
 171                 orgwarning = 1;
 172         }
 173
 174         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 175         D_word(value);
 176 //printf("BuildRISC: opcode=$%X, reg1=$%X, reg2=$%X, final=$%04X\n", opcode, reg1, reg2, value);
 177 }
 178
 179
 180 //
 181 // Get a RISC register
 182 //
 183 int GetRegister(WORD rattr)
 184 {
 185         VALUE eval;                                     // Expression value
 186         WORD eattr;                                     // Expression attributes
 187         SYM * esym;                                     // External symbol involved in expr.
 188         TOKEN r_expr[EXPRSIZE];         // Expression token list
 189
 190         // Evaluate what's in the global "tok" buffer
 191         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 192                 return ERROR;
 193
 194         if ((challoc - ch_size) < 4)
 195                 chcheck(4L);
 196
 197         if (!(eattr & DEFINED))
 198         {
 199                 AddFixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 200                 return 0;
 201         }
 202
 203         // If we got a register in range (0-31), return it
 204         if ((eval >= 0) && (eval <= 31))
 205                 return eval;
 206
 207         // Otherwise, it's out of range & we flag an error
 208         return error(reg_err);
 209 }
 210
 211
 212 //
 213 // Do RISC code generation
 214 //
 215 int GenerateRISCCode(int state)
 216 {
 217         int reg1;                                       // Register 1
 218         int reg2;                                       // Register 2
 219         int val = 0;                            // Constructed value
 220         char scratch[80];
 221         SYM * ccsym;
 222         SYM * sy;
 223         int i, commaFound;
 224         TOKEN * t;
 225         WORD attrflg;
 226         int indexed;                            // Indexed register flag
 227
 228         VALUE eval;                                     // Expression value
 229         WORD eattr;                                     // Expression attributes
 230         SYM * esym;                                     // External symbol involved in expr.
 231         TOKEN r_expr[EXPRSIZE];         // Expression token list
 232
 233         // Get opcode parameter and type
 234         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 235         unsigned type = roptbl[state - 3000].typ;
 236         riscImmTokenSeen = 0;           // Set to "token not seen yet"
 237
 238         // Detect whether the opcode parmeter passed determines that the opcode is
 239         // specific to only one of the RISC processors and ensure it is legal in
 240         // the current code section. If not then show error and return.
 241         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 242                 return error("Opcode is not valid in this code section");
 243
 244         // Process RISC opcode
 245         switch (type)
 246         {
 247         // No operand instructions
 248         // NOP (57)
 249         case RI_NONE:
 250                 BuildRISCIntructionWord(parm, 0, 0);
 251                 break;
 252
 253         // Single operand instructions (Rd)
 254         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S,
 255         // UNPACK
 256         case RI_ONE:
 257                 reg2 = GetRegister(FU_REGTWO);
 258                 at_eol();
 259                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 260                 break;
 261
 262         // Two operand instructions (Rs,Rd)
 263         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT,
 264         // MMULT, MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 265         case RI_TWO:
 266                 if (parm == 37)
 267                         altbankok = 1;                      // MOVEFA
 268
 269                 reg1 = GetRegister(FU_REGONE);
 270                 CHECK_COMMA;
 271
 272                 if (parm == 36)
 273                         altbankok = 1;                      // MOVETA
 274
 275                 reg2 = GetRegister(FU_REGTWO);
 276                 at_eol();
 277                 BuildRISCIntructionWord(parm, reg1, reg2);
 278                 break;
 279
 280         // Numeric operand (n,Rd) where n = -16..+15
 281         // CMPQ
 282         case RI_NUM_15:
 283
 284         // Numeric operand (n,Rd) where n = 0..31
 285         // BCLR, BSET, BTST, MOVEQ
 286         case RI_NUM_31:
 287
 288         // Numeric operand (n,Rd) where n = 1..32
 289         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ,
 290         // RORQ
 291         case RI_NUM_32:
 292                 switch (type)
 293                 {
 294                 case RI_NUM_15:
 295                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 296                         break;
 297                 default:
 298                 case RI_NUM_31:
 299                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 300                         break;
 301                 case RI_NUM_32:
 302                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 303                         break;
 304                 }
 305
 306                 if (parm & SUB32)
 307                         attrflg |= FU_SUB32;
 308
 309                 if (*tok != '#')
 310                         return MalformedOpcode(0x01);
 311
 312                 tok++;
 313                 riscImmTokenSeen = 1;
 314
 315                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 316                         return MalformedOpcode(0x02);
 317
 318                 if ((challoc - ch_size) < 4)
 319                         chcheck(4L);
 320
 321                 if (!(eattr & DEFINED))
 322                 {
 323                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 324                         reg1 = 0;
 325                 }
 326                 else
 327                 {
 328                         if ((int)eval < reg1 || (int)eval > reg2)
 329                                 return error("constant out of range");
 330
 331                         if (parm & SUB32)
 332                                 reg1 = 32 - eval;
 333                         else if (type == RI_NUM_32)
 334                                 reg1 = (reg1 == 32 ? 0 : eval);
 335                         else
 336                                 reg1 = eval;
 337                 }
 338
 339                 CHECK_COMMA;
 340                 reg2 = GetRegister(FU_REGTWO);
 341                 at_eol();
 342                 BuildRISCIntructionWord(parm, reg1, reg2);
 343                 break;
 344
 345         // Move Immediate--n,Rn--n in Second Word
 346         case RI_MOVEI:
 347                 if (*tok != '#')
 348                         return MalformedOpcode(0x03);
 349
 350                 tok++;
 351                 riscImmTokenSeen = 1;
 352
 353                 // Check for equated register after # and return error if so
 354                 if (*tok == SYMBOL)
 355                 {
 356                         sy = lookup(string[tok[1]], LABEL, 0);
 357
 358                         if (sy && (sy->sattre & EQUATEDREG))
 359                                 return error("equated register in 1st operand of MOVEI instruction");
 360                 }
 361
 362                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 363                         return MalformedOpcode(0x04);
 364
 365                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 366                 {
 367                         if (legacy_flag)
 368                         {
 369                                 // User doesn't care, emit a NOP to fix
 370                                 BuildRISCIntructionWord(57, 0, 0);
 371                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 372                         }
 373                         else
 374                                 warn("MOVEI immediately follows JUMP");
 375                 }
 376
 377                 if ((challoc - ch_size) < 4)
 378                         chcheck(4L);
 379
 380                 if (!(eattr & DEFINED))
 381                 {
 382                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 383                         eval = 0;
 384                 }
 385                 else
 386                 {
 387                         if (eattr & TDB)
 388 //{
 389 //printf("RISCASM: Doing MarkRelocatable for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 390                                 MarkRelocatable(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 391 //}
 392                 }
 393
 394 //              val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 395                 val = WORDSWAP32(eval);
 396                 CHECK_COMMA;
 397                 reg2 = GetRegister(FU_REGTWO);
 398                 at_eol();
 399                 D_word((((parm & 0x3F) << 10) + reg2));
 400                 D_long(val);
 401                 break;
 402
 403         // PC,Rd or Rs,Rd
 404         case RI_MOVE:
 405                 if (*tok == KW_PC)
 406                 {
 407                         parm = 51;
 408                         reg1 = 0;
 409                         tok++;
 410                 }
 411                 else
 412                 {
 413                         parm = 34;
 414                         reg1 = GetRegister(FU_REGONE);
 415                 }
 416
 417                 CHECK_COMMA;
 418                 reg2 = GetRegister(FU_REGTWO);
 419                 at_eol();
 420                 BuildRISCIntructionWord(parm, reg1, reg2);
 421                 break;
 422
 423         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 424         case RI_LOAD:
 425                 indexed = 0;
 426                 parm = 41;
 427
 428                 if (*tok != '(')
 429                         return MalformedOpcode(0x05);
 430
 431                 tok++;
 432
 433         if ((*(tok + 1) == '+') || (*(tok + 1) == '-')) {
 434             // Trying to make indexed call
 435             if ((*tok == KW_R14 || *tok == KW_R15)) {
 436                 indexed = (*tok - KW_R0);
 437             } else {
 438                 return IllegalIndexedRegister(*tok);
 439             }
 440         }
 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                         {
 455                                 if ((*(tok + 2) == '+') || (*(tok + 2) == '-')) {
 456                                     if ((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15) {
 457                                         indexed = (sy->svalue & 0x1F);
 458                         tok++;
 459                                     } else {
 460                                         return IllegalIndexedRegisterEqur(sy);
 461                                     }
 462                                 }
 463                         }
 464                 }
 465
 466                 if (!indexed)
 467                 {
 468                         reg1 = GetRegister(FU_REGONE);
 469                 }
 470                 else
 471                 {
 472                         reg1 = indexed;
 473                         indexed = 0;
 474                         tok++;
 475
 476                         if (*tok == '+')
 477                         {
 478                                 parm = (WORD)(reg1 - 14 + 58);
 479                                 tok++;
 480
 481                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 482                                         indexed = 1;
 483
 484                                 if (*tok == SYMBOL)
 485                                 {
 486 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 487                                         sy = lookup(string[tok[1]], LABEL, 0);
 488
 489                                         if (!sy)
 490                                         {
 491                                                 error(reg_err);
 492                                                 return ERROR;
 493                                         }
 494
 495                                         if (sy->sattre & EQUATEDREG)
 496                                                 indexed = 1;
 497                                 }
 498
 499                                 if (indexed)
 500                                 {
 501                                         reg1 = GetRegister(FU_REGONE);
 502                                 }
 503                                 else
 504                                 {
 505                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 506                                                 return MalformedOpcode(0x06);
 507
 508                                         if ((challoc - ch_size) < 4)
 509                                                 chcheck(4L);
 510
 511                                         if (!(eattr & DEFINED))
 512                                                 return error("constant expected after '+'");
 513
 514                                         reg1 = eval;
 515
 516                                         if (reg1 == 0)
 517                                         {
 518                                                 reg1 = 14 + (parm - 58);
 519                                                 parm = 41;
 520                                                 warn("NULL offset in LOAD ignored");
 521                                         }
 522                                         else
 523                                         {
 524                                                 if (reg1 < 1 || reg1 > 32)
 525                                                         return error("constant in LOAD out of range");
 526
 527                                                 if (reg1 == 32)
 528                                                         reg1 = 0;
 529
 530                                                 parm = (WORD)(parm - 58 + 43);
 531                                         }
 532                                 }
 533                         }
 534                         else
 535                         {
 536                                 reg1 = GetRegister(FU_REGONE);
 537                         }
 538                 }
 539
 540                 if (*tok != ')')
 541                         return MalformedOpcode(0x07);
 542
 543                 tok++;
 544                 CHECK_COMMA;
 545                 reg2 = GetRegister(FU_REGTWO);
 546                 at_eol();
 547                 BuildRISCIntructionWord(parm, reg1, reg2);
 548                 break;
 549
 550         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 551         case RI_STORE:
 552                 parm = 47;
 553                 reg1 = GetRegister(FU_REGONE);
 554                 CHECK_COMMA;
 555
 556                 if (*tok != '(')
 557                         return MalformedOpcode(0x08);
 558
 559                 tok++;
 560                 indexed = 0;
 561
 562                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 563                         indexed = (*tok - KW_R0);
 564
 565                 if (*tok == SYMBOL)
 566                 {
 567                         sy = lookup(string[tok[1]], LABEL, 0);
 568
 569                         if (!sy)
 570                         {
 571                                 error(reg_err);
 572                                 return ERROR;
 573                         }
 574
 575                         if (sy->sattre & EQUATEDREG)
 576                         {
 577                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 578                                         && (*(tok + 2) != ')'))
 579                                 {
 580                                         indexed = (sy->svalue & 0x1F);
 581                                         tok++;
 582                                 }
 583                         }
 584                 }
 585
 586                 if (!indexed)
 587                 {
 588                         reg2 = GetRegister(FU_REGTWO);
 589                 }
 590                 else
 591                 {
 592                         reg2 = indexed;
 593                         indexed = 0;
 594                         tok++;
 595
 596                         if (*tok == '+')
 597                         {
 598                                 parm = (WORD)(reg2 - 14 + 60);
 599                                 tok++;
 600
 601                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 602                                         indexed = 1;
 603
 604                                 if (*tok == SYMBOL)
 605                                 {
 606                                         sy = lookup(string[tok[1]], LABEL, 0);
 607
 608                                         if (!sy)
 609                                         {
 610                                                 error(reg_err);
 611                                                 return ERROR;
 612                                         }
 613
 614                                         if (sy->sattre & EQUATEDREG)
 615                                                 indexed = 1;
 616                                 }
 617
 618                                 if (indexed)
 619                                 {
 620                                         reg2 = GetRegister(FU_REGTWO);
 621                                 }
 622                                 else
 623                                 {
 624                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 625                                                 return MalformedOpcode(0x09);
 626
 627                                         if ((challoc - ch_size) < 4)
 628                                                 chcheck(4L);
 629
 630                                         if (!(eattr & DEFINED))
 631                                         {
 632                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 633                                                 reg2 = 0;
 634                                         }
 635                                         else
 636                                         {
 637                                                 reg2 = eval;
 638
 639                                                 if (reg2 == 0)
 640                                                 {
 641                                                         reg2 = 14 + (parm - 60);
 642                                                         parm = 47;
 643                                                         warn("NULL offset in STORE ignored");
 644                                                 }
 645                                                 else
 646                                                 {
 647                                                         if (reg2 < 1 || reg2 > 32)
 648                                                                 return error("constant in STORE out of range");
 649
 650                                                         if (reg2 == 32)
 651                                                                 reg2 = 0;
 652
 653                                                         parm = (WORD)(parm - 60 + 49);
 654                                                 }
 655                                         }
 656                                 }
 657                         }
 658                         else
 659                         {
 660                                 reg2 = GetRegister(FU_REGTWO);
 661                         }
 662                 }
 663
 664                 if (*tok != ')')
 665                         return MalformedOpcode(0x0A);
 666
 667                 tok++;
 668                 at_eol();
 669                 BuildRISCIntructionWord(parm, reg2, reg1);
 670                 break;
 671
 672         // LOADB/LOADP/LOADW (Rn),Rn
 673         case RI_LOADN:
 674                 if (*tok != '(')
 675                         return MalformedOpcode(0x0B);
 676
 677                 tok++;
 678                 reg1 = GetRegister(FU_REGONE);
 679
 680                 if (*tok != ')')
 681                         return MalformedOpcode(0x0C);
 682
 683                 tok++;
 684                 CHECK_COMMA;
 685                 reg2 = GetRegister(FU_REGTWO);
 686                 at_eol();
 687                 BuildRISCIntructionWord(parm, reg1, reg2);
 688                 break;
 689
 690         // STOREB/STOREP/STOREW Rn,(Rn)
 691         case RI_STOREN:
 692                 reg1 = GetRegister(FU_REGONE);
 693                 CHECK_COMMA;
 694
 695                 if (*tok != '(')
 696                         return MalformedOpcode(0x0D);
 697
 698                 tok++;
 699                 reg2 = GetRegister(FU_REGTWO);
 700
 701                 if (*tok != ')')
 702                         return MalformedOpcode(0x0E);
 703
 704                 tok++;
 705                 at_eol();
 706                 BuildRISCIntructionWord(parm, reg2, reg1);
 707                 break;
 708
 709         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 710         case RI_JR:
 711
 712         // Jump Absolute - cc,(Rs) - reg2=cc
 713         case RI_JUMP:
 714                 // Check to see if there is a comma in the token string. If not then
 715                 // the JR or JUMP should default to 0, Jump Always
 716                 commaFound = 0;
 717
 718                 for(t=tok; *t!=EOL; t++)
 719                 {
 720                         if (*t == ',')
 721                         {
 722                                 commaFound = 1;
 723                                 break;
 724                         }
 725                 }
 726
 727                 if (commaFound)
 728                 {
 729                         if (*tok == CONST)
 730                         {
 731                                 // CC using a constant number
 732                                 tok++;
 733                                 val = *tok;
 734                                 tok++;
 735                                 CHECK_COMMA;
 736                         }
 737                         else if (*tok == SYMBOL)
 738                         {
 739                                 val = 99;
 740 //                              strcpy(scratch, (char *)tok[1]);
 741                                 strcpy(scratch, string[tok[1]]);
 742                                 strtoupper(scratch);
 743
 744                                 for(i=0; i<MAXINTERNCC; i++)
 745                                 {
 746                                         // Look for the condition code & break if found
 747                                         if (strcmp(condname[i], scratch) == 0)
 748                                         {
 749                                                 val = condnumber[i];
 750                                                 break;
 751                                         }
 752                                 }
 753
 754                                 // Standard CC was not found, look for an equated one
 755                                 if (val == 99)
 756                                 {
 757 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 758                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 759
 760                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 761                                         {
 762                                                 val = ccsym->svalue;
 763                                         }
 764                                         else
 765                                                 return error("unknown condition code");
 766                                 }
 767
 768                                 tok += 2;
 769                                 CHECK_COMMA;
 770                         }
 771                         else if (*tok == '(')
 772                         {
 773                                 // Set CC to "Jump Always"
 774                                 val = 0;
 775                         }
 776                 }
 777                 else
 778                 {
 779                         // Set CC to "Jump Always"
 780                         val = 0;
 781                 }
 782
 783                 if (val < 0 || val > 31)
 784                         return error("condition constant out of range");
 785
 786                 // Store condition code
 787                 reg1 = val;
 788
 789                 if (type == RI_JR)
 790                 {
 791                         // JR cc,n
 792                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 793                                 return MalformedOpcode(0x0F);
 794
 795                         if ((challoc - ch_size) < 4)
 796                                 chcheck(4L);
 797
 798                         if (!(eattr & DEFINED))
 799                         {
 800                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 801                                 reg2 = 0;
 802                         }
 803                         else
 804                         {
 805                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 806
 807                                 if ((reg2 < -16) || (reg2 > 15))
 808                                         error("PC relative overflow");
 809                         }
 810
 811                         BuildRISCIntructionWord(parm, reg2, reg1);
 812                 }
 813                 else
 814                 {
 815                         // JUMP cc, (Rn)
 816                         if (*tok != '(')
 817                                 return MalformedOpcode(0x10);
 818
 819                         tok++;
 820                         reg2 = GetRegister(FU_REGTWO);
 821
 822                         if (*tok != ')')
 823                                 return MalformedOpcode(0x11);
 824
 825                         tok++;
 826                         at_eol();
 827                         BuildRISCIntructionWord(parm, reg2, reg1);
 828                 }
 829
 830                 break;
 831
 832         // Should never get here :-D
 833         default:
 834                 return error("Unknown RISC opcode type");
 835         }
 836
 837         lastOpcode = type;
 838         return 0;
 839 }
 840