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 "error.h"
  11 #include "sect.h"
  12 #include "token.h"
  13 #include "expr.h"
  14 #include "direct.h"
  15 #include "mark.h"
  16 #include "amode.h"
  17
  18 #define DEF_MR                          // Declare keyword values
  19 #include "risckw.h"                     // Incl. generated risc keywords
  20
  21 #define DEF_KW                          // Declare keyword values
  22 #include "kwtab.h"                      // Incl. generated keyword tables & defs
  23
  24
  25 unsigned altbankok = 0;         // Ok to use alternate register bank
  26 unsigned orgactive = 0;         // RISC org directive active
  27 unsigned orgaddr = 0;           // Org'd address
  28 unsigned orgwarning = 0;        // Has an ORG warning been issued
  29 int lastOpcode = -1;            // Last RISC opcode assembled
  30 uint8_t riscImmTokenSeen;       // The '#' (immediate) token was seen
  31
  32 const char reg_err[] = "missing register R0...R31";
  33
  34 // Jaguar jump condition names
  35 const char condname[MAXINTERNCC][5] = {
  36         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  37         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  38         "PL", "MI", "F"
  39 };
  40
  41 // Jaguar jump condition numbers
  42 const char condnumber[] = {
  43         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  44         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  45 };
  46
  47 const struct opcoderecord roptbl[] = {
  48         { MR_ADD,     RI_TWO,    0 },
  49         { MR_ADDC,    RI_TWO,    1 },
  50         { MR_ADDQ,    RI_NUM_32, 2 },
  51         { MR_ADDQT,   RI_NUM_32, 3 },
  52         { MR_SUB,     RI_TWO,    4 },
  53         { MR_SUBC,    RI_TWO,    5 },
  54         { MR_SUBQ,    RI_NUM_32, 6 },
  55         { MR_SUBQT,   RI_NUM_32, 7 },
  56         { MR_NEG,     RI_ONE,    8 },
  57         { MR_AND,     RI_TWO,    9 },
  58         { MR_OR,      RI_TWO,    10 },
  59         { MR_XOR,     RI_TWO,    11 },
  60         { MR_NOT,     RI_ONE,    12 },
  61         { MR_BTST,    RI_NUM_31, 13 },
  62         { MR_BSET,    RI_NUM_31, 14 },
  63         { MR_BCLR,    RI_NUM_31, 15 },
  64         { MR_MULT,    RI_TWO,    16 },
  65         { MR_IMULT,   RI_TWO,    17 },
  66         { MR_IMULTN,  RI_TWO,    18 },
  67         { MR_RESMAC,  RI_ONE,    19 },
  68         { MR_IMACN,   RI_TWO,    20 },
  69         { MR_DIV,     RI_TWO,    21 },
  70         { MR_ABS,     RI_ONE,    22 },
  71         { MR_SH,      RI_TWO,    23 },
  72         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
  73         { MR_SHRQ,    RI_NUM_32, 25 },
  74         { MR_SHA,     RI_TWO,    26 },
  75         { MR_SHARQ,   RI_NUM_32, 27 },
  76         { MR_ROR,     RI_TWO,    28 },
  77         { MR_RORQ,    RI_NUM_32, 29 },
  78         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
  79         { MR_CMP,     RI_TWO,    30 },
  80         { MR_CMPQ,    RI_NUM_15, 31 },
  81         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
  82         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
  83         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
  84         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
  85         { MR_MOVEQ,   RI_NUM_31, 35 },
  86         { MR_MOVETA,  RI_TWO,    36 },
  87         { MR_MOVEFA,  RI_TWO,    37 },
  88         { MR_MOVEI,   RI_MOVEI,  38 },
  89         { MR_LOADB,   RI_LOADN,  39 },
  90         { MR_LOADW,   RI_LOADN,  40 },
  91         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
  92         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
  93         { MR_STOREB,  RI_STOREN, 45 },
  94         { MR_STOREW,  RI_STOREN, 46 },
  95         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
  96         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
  97         { MR_JUMP,    RI_JUMP,   52 },
  98         { MR_JR,      RI_JR,     53 },
  99         { MR_MMULT,   RI_TWO,    54 },
 100         { MR_MTOI,    RI_TWO,    55 },
 101         { MR_NORMI,   RI_TWO,    56 },
 102         { MR_NOP,     RI_NONE,   57 },
 103         { MR_SAT24,   RI_ONE,    62 },
 104         { MR_UNPACK,  RI_ONE,    63 + GPUONLY | (0 << 6) },
 105         { MR_PACK,    RI_ONE,    63 + GPUONLY | (1 << 6) },
 106         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 107         { MR_MOVE,    RI_MOVE,   0 },
 108         { MR_LOAD,    RI_LOAD,   0 },
 109         { MR_STORE,   RI_STORE,  0 }
 110 };
 111
 112
 113 //
 114 // Convert a string to uppercase
 115 //
 116 void strtoupper(char * s)
 117 {
 118         while (*s)
 119                 *s++ &= 0xDF;
 120 }
 121
 122
 123 //
 124 // Function to return "malformed expression" error
 125 // This is done mainly to remove a bunch of GOTO statements in the parser
 126 //
 127 static inline int MalformedOpcode(int signal)
 128 {
 129         char buf[16];
 130         sprintf(buf, "%02X", signal);
 131         return errors("Malformed opcode [internal $%s]", buf);
 132 }
 133
 134 //
 135 // Function to return "Illegal Indexed Register" error
 136 // Anyone trying to index something other than R14 or R15
 137 //
 138 static inline int IllegalIndexedRegister(int reg)
 139 {
 140     char buf[16];
 141     sprintf(buf, "%d", reg - KW_R0);
 142     return errors("Attempted index reference with non-indexable register (r%s)", buf);
 143 }
 144
 145 //
 146 // Function to return "Illegal Indexed Register" error for EQUR scenarios
 147 // Trying to use register value within EQUR that isn't 14 or 15
 148 //
 149 static inline int IllegalIndexedRegisterEqur(SYM *sy)
 150 {
 151     //char buf[160];
 152     char *buf = NULL;
 153     buf = (char *)malloc((strlen(sy->sname) + 7) * sizeof(char));
 154     if (NULL != buf) {
 155         sprintf(buf, "%s = r%d",sy->sname, sy->svalue);
 156         return errors("Attempted index reference with non-indexable register within EQUR (%s)", buf);
 157     }
 158     return errors("Unable to allocate memory! (IllegalIndexRegisterEqur)", "OOPS");
 159 }
 160
 161 //
 162 // Build RISC instruction word
 163 //
 164 void BuildRISCIntructionWord(unsigned short opcode, int reg1, int reg2)
 165 {
 166         // Check for absolute address setting
 167         if (!orgwarning && !orgactive)
 168         {
 169                 warn("RISC code generated with no origin defined");
 170                 orgwarning = 1;
 171         }
 172
 173         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 174         D_word(value);
 175 //printf("BuildRISC: opcode=$%X, reg1=$%X, reg2=$%X, final=$%04X\n", opcode, reg1, reg2, value);
 176 }
 177
 178
 179 //
 180 // Get a RISC register
 181 //
 182 int GetRegister(WORD rattr)
 183 {
 184         VALUE eval;                                     // Expression value
 185         WORD eattr;                                     // Expression attributes
 186         SYM * esym;                                     // External symbol involved in expr.
 187         TOKEN r_expr[EXPRSIZE];         // Expression token list
 188
 189         // Evaluate what's in the global "tok" buffer
 190         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 191                 return ERROR;
 192
 193         if ((challoc - ch_size) < 4)
 194                 chcheck(4L);
 195
 196         if (!(eattr & DEFINED))
 197         {
 198                 AddFixup((WORD)(FU_WORD | rattr), sloc, r_expr);
 199                 return 0;
 200         }
 201
 202         // If we got a register in range (0-31), return it
 203         if ((eval >= 0) && (eval <= 31))
 204                 return eval;
 205
 206         // Otherwise, it's out of range & we flag an error
 207         return error(reg_err);
 208 }
 209
 210
 211 //
 212 // Do RISC code generation
 213 //
 214 int GenerateRISCCode(int state)
 215 {
 216         int reg1;                                       // Register 1
 217         int reg2;                                       // Register 2
 218         int val = 0;                            // Constructed value
 219         char scratch[80];
 220         SYM * ccsym;
 221         SYM * sy;
 222         int i, commaFound;
 223         TOKEN * t;
 224         WORD attrflg;
 225         int indexed;                            // Indexed register flag
 226
 227         VALUE eval;                                     // Expression value
 228         WORD eattr;                                     // Expression attributes
 229         SYM * esym;                                     // External symbol involved in expr.
 230         TOKEN r_expr[EXPRSIZE];         // Expression token list
 231
 232         // Get opcode parameter and type
 233         unsigned short parm = (WORD)(roptbl[state - 3000].parm);
 234         unsigned type = roptbl[state - 3000].typ;
 235         riscImmTokenSeen = 0;           // Set to "token not seen yet"
 236
 237         // Detect whether the opcode parmeter passed determines that the opcode is
 238         // specific to only one of the RISC processors and ensure it is legal in
 239         // the current code section. If not then show error and return.
 240         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 241                 return error("Opcode is not valid in this code section");
 242
 243         // Process RISC opcode
 244         switch (type)
 245         {
 246         // No operand instructions
 247         // NOP (57)
 248         case RI_NONE:
 249                 BuildRISCIntructionWord(parm, 0, 0);
 250                 break;
 251
 252         // Single operand instructions (Rd)
 253         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S,
 254         // UNPACK
 255         case RI_ONE:
 256                 reg2 = GetRegister(FU_REGTWO);
 257                 at_eol();
 258                 BuildRISCIntructionWord(parm, parm >> 6, reg2);
 259                 break;
 260
 261         // Two operand instructions (Rs,Rd)
 262         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT,
 263         // MMULT, MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 264         case RI_TWO:
 265                 if (parm == 37)
 266                         altbankok = 1;                      // MOVEFA
 267
 268                 reg1 = GetRegister(FU_REGONE);
 269                 CHECK_COMMA;
 270
 271                 if (parm == 36)
 272                         altbankok = 1;                      // MOVETA
 273
 274                 reg2 = GetRegister(FU_REGTWO);
 275                 at_eol();
 276                 BuildRISCIntructionWord(parm, reg1, reg2);
 277                 break;
 278
 279         // Numeric operand (n,Rd) where n = -16..+15
 280         // CMPQ
 281         case RI_NUM_15:
 282
 283         // Numeric operand (n,Rd) where n = 0..31
 284         // BCLR, BSET, BTST, MOVEQ
 285         case RI_NUM_31:
 286
 287         // Numeric operand (n,Rd) where n = 1..32
 288         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ,
 289         // RORQ
 290         case RI_NUM_32:
 291                 switch (type)
 292                 {
 293                 case RI_NUM_15:
 294                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 295                         break;
 296                 default:
 297                 case RI_NUM_31:
 298                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 299                         break;
 300                 case RI_NUM_32:
 301                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 302                         break;
 303                 }
 304
 305                 if (parm & SUB32)
 306                         attrflg |= FU_SUB32;
 307
 308                 if (*tok != '#')
 309                         return MalformedOpcode(0x01);
 310
 311                 tok++;
 312                 riscImmTokenSeen = 1;
 313
 314                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 315                         return MalformedOpcode(0x02);
 316
 317                 if ((challoc - ch_size) < 4)
 318                         chcheck(4L);
 319
 320                 if (!(eattr & DEFINED))
 321                 {
 322                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 323                         reg1 = 0;
 324                 }
 325                 else
 326                 {
 327                         if ((int)eval < reg1 || (int)eval > reg2)
 328                                 return error("constant out of range");
 329
 330                         if (parm & SUB32)
 331                                 reg1 = 32 - eval;
 332                         else if (type == RI_NUM_32)
 333                                 reg1 = (reg1 == 32 ? 0 : eval);
 334                         else
 335                                 reg1 = eval;
 336                 }
 337
 338                 CHECK_COMMA;
 339                 reg2 = GetRegister(FU_REGTWO);
 340                 at_eol();
 341                 BuildRISCIntructionWord(parm, reg1, reg2);
 342                 break;
 343
 344         // Move Immediate--n,Rn--n in Second Word
 345         case RI_MOVEI:
 346                 if (*tok != '#')
 347                         return MalformedOpcode(0x03);
 348
 349                 tok++;
 350                 riscImmTokenSeen = 1;
 351
 352                 // Check for equated register after # and return error if so
 353                 if (*tok == SYMBOL)
 354                 {
 355                         sy = lookup(string[tok[1]], LABEL, 0);
 356
 357                         if (sy && (sy->sattre & EQUATEDREG))
 358                                 return error("equated register in 1st operand of MOVEI instruction");
 359                 }
 360
 361                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 362                         return MalformedOpcode(0x04);
 363
 364                 if (lastOpcode == RI_JUMP || lastOpcode == RI_JR)
 365                 {
 366                         if (legacy_flag)
 367                         {
 368                                 // User doesn't care, emit a NOP to fix
 369                                 BuildRISCIntructionWord(57, 0, 0);
 370                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 371                         }
 372                         else
 373                                 warn("MOVEI immediately follows JUMP");
 374                 }
 375
 376                 if ((challoc - ch_size) < 4)
 377                         chcheck(4L);
 378
 379                 if (!(eattr & DEFINED))
 380                 {
 381                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 382                         eval = 0;
 383                 }
 384                 else
 385                 {
 386                         if (eattr & TDB)
 387 //{
 388 //printf("RISCASM: Doing MarkRelocatable for RI_MOVEI (tdb=$%X)...\n", eattr & TDB);
 389                                 MarkRelocatable(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 390 //}
 391                 }
 392
 393 //              val = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 394                 val = WORDSWAP32(eval);
 395                 CHECK_COMMA;
 396                 reg2 = GetRegister(FU_REGTWO);
 397                 at_eol();
 398                 D_word((((parm & 0x3F) << 10) + reg2));
 399                 D_long(val);
 400                 break;
 401
 402         // PC,Rd or Rs,Rd
 403         case RI_MOVE:
 404                 if (*tok == KW_PC)
 405                 {
 406                         parm = 51;
 407                         reg1 = 0;
 408                         tok++;
 409                 }
 410                 else
 411                 {
 412                         parm = 34;
 413                         reg1 = GetRegister(FU_REGONE);
 414                 }
 415
 416                 CHECK_COMMA;
 417                 reg2 = GetRegister(FU_REGTWO);
 418                 at_eol();
 419                 BuildRISCIntructionWord(parm, reg1, reg2);
 420                 break;
 421
 422         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 423         case RI_LOAD:
 424                 indexed = 0;
 425                 parm = 41;
 426
 427                 if (*tok != '(')
 428                         return MalformedOpcode(0x05);
 429
 430                 tok++;
 431
 432         if ((*(tok + 1) == '+') || (*(tok + 1) == '-')) {
 433             // Trying to make indexed call
 434             if ((*tok == KW_R14 || *tok == KW_R15)) {
 435                 indexed = (*tok - KW_R0);
 436             } else {
 437                 return IllegalIndexedRegister(*tok);
 438             }
 439         }
 440
 441                 if (*tok == SYMBOL)
 442                 {
 443 //                      sy = lookup((char *)tok[1], LABEL, 0);
 444                         sy = lookup(string[tok[1]], LABEL, 0);
 445
 446                         if (!sy)
 447                         {
 448                                 error(reg_err);
 449                                 return ERROR;
 450                         }
 451
 452                         if (sy->sattre & EQUATEDREG)
 453                         {
 454                                 if ((*(tok + 2) == '+') || (*(tok + 2) == '-')) {
 455                                     if ((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15) {
 456                                         indexed = (sy->svalue & 0x1F);
 457                         tok++;
 458                                     } else {
 459                                         return IllegalIndexedRegisterEqur(sy);
 460                                     }
 461                                 }
 462                         }
 463                 }
 464
 465                 if (!indexed)
 466                 {
 467                         reg1 = GetRegister(FU_REGONE);
 468                 }
 469                 else
 470                 {
 471                         reg1 = indexed;
 472                         indexed = 0;
 473                         tok++;
 474
 475                         if (*tok == '+')
 476                         {
 477                                 parm = (WORD)(reg1 - 14 + 58);
 478                                 tok++;
 479
 480                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 481                                         indexed = 1;
 482
 483                                 if (*tok == SYMBOL)
 484                                 {
 485 //                                      sy = lookup((char *)tok[1], LABEL, 0);
 486                                         sy = lookup(string[tok[1]], LABEL, 0);
 487
 488                                         if (!sy)
 489                                         {
 490                                                 error(reg_err);
 491                                                 return ERROR;
 492                                         }
 493
 494                                         if (sy->sattre & EQUATEDREG)
 495                                                 indexed = 1;
 496                                 }
 497
 498                                 if (indexed)
 499                                 {
 500                                         reg1 = GetRegister(FU_REGONE);
 501                                 }
 502                                 else
 503                                 {
 504                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 505                                                 return MalformedOpcode(0x06);
 506
 507                                         if ((challoc - ch_size) < 4)
 508                                                 chcheck(4L);
 509
 510                                         if (!(eattr & DEFINED))
 511                                                 return error("constant expected after '+'");
 512
 513                                         reg1 = eval;
 514
 515                                         if (reg1 == 0)
 516                                         {
 517                                                 reg1 = 14 + (parm - 58);
 518                                                 parm = 41;
 519                                                 warn("NULL offset in LOAD ignored");
 520                                         }
 521                                         else
 522                                         {
 523                                                 if (reg1 < 1 || reg1 > 32)
 524                                                         return error("constant in LOAD out of range");
 525
 526                                                 if (reg1 == 32)
 527                                                         reg1 = 0;
 528
 529                                                 parm = (WORD)(parm - 58 + 43);
 530                                         }
 531                                 }
 532                         }
 533                         else
 534                         {
 535                                 reg1 = GetRegister(FU_REGONE);
 536                         }
 537                 }
 538
 539                 if (*tok != ')')
 540                         return MalformedOpcode(0x07);
 541
 542                 tok++;
 543                 CHECK_COMMA;
 544                 reg2 = GetRegister(FU_REGTWO);
 545                 at_eol();
 546                 BuildRISCIntructionWord(parm, reg1, reg2);
 547                 break;
 548
 549         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 550         case RI_STORE:
 551                 parm = 47;
 552                 reg1 = GetRegister(FU_REGONE);
 553                 CHECK_COMMA;
 554
 555                 if (*tok != '(')
 556                         return MalformedOpcode(0x08);
 557
 558                 tok++;
 559                 indexed = 0;
 560
 561                 if ((*tok == KW_R14 || *tok == KW_R15) && (*(tok + 1) != ')'))
 562                         indexed = (*tok - KW_R0);
 563
 564                 if (*tok == SYMBOL)
 565                 {
 566                         sy = lookup(string[tok[1]], LABEL, 0);
 567
 568                         if (!sy)
 569                         {
 570                                 error(reg_err);
 571                                 return ERROR;
 572                         }
 573
 574                         if (sy->sattre & EQUATEDREG)
 575                         {
 576                                 if (((sy->svalue & 0x1F) == 14 || (sy->svalue & 0x1F) == 15)
 577                                         && (*(tok + 2) != ')'))
 578                                 {
 579                                         indexed = (sy->svalue & 0x1F);
 580                                         tok++;
 581                                 }
 582                         }
 583                 }
 584
 585                 if (!indexed)
 586                 {
 587                         reg2 = GetRegister(FU_REGTWO);
 588                 }
 589                 else
 590                 {
 591                         reg2 = indexed;
 592                         indexed = 0;
 593                         tok++;
 594
 595                         if (*tok == '+')
 596                         {
 597                                 parm = (WORD)(reg2 - 14 + 60);
 598                                 tok++;
 599
 600                                 if (*tok >= KW_R0 && *tok <= KW_R31)
 601                                         indexed = 1;
 602
 603                                 if (*tok == SYMBOL)
 604                                 {
 605                                         sy = lookup(string[tok[1]], LABEL, 0);
 606
 607                                         if (!sy)
 608                                         {
 609                                                 error(reg_err);
 610                                                 return ERROR;
 611                                         }
 612
 613                                         if (sy->sattre & EQUATEDREG)
 614                                                 indexed = 1;
 615                                 }
 616
 617                                 if (indexed)
 618                                 {
 619                                         reg2 = GetRegister(FU_REGTWO);
 620                                 }
 621                                 else
 622                                 {
 623                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 624                                                 return MalformedOpcode(0x09);
 625
 626                                         if ((challoc - ch_size) < 4)
 627                                                 chcheck(4L);
 628
 629                                         if (!(eattr & DEFINED))
 630                                         {
 631                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 632                                                 reg2 = 0;
 633                                         }
 634                                         else
 635                                         {
 636                                                 reg2 = eval;
 637
 638                                                 if (reg2 == 0)
 639                                                 {
 640                                                         reg2 = 14 + (parm - 60);
 641                                                         parm = 47;
 642                                                         warn("NULL offset in STORE ignored");
 643                                                 }
 644                                                 else
 645                                                 {
 646                                                         if (reg2 < 1 || reg2 > 32)
 647                                                                 return error("constant in STORE out of range");
 648
 649                                                         if (reg2 == 32)
 650                                                                 reg2 = 0;
 651
 652                                                         parm = (WORD)(parm - 60 + 49);
 653                                                 }
 654                                         }
 655                                 }
 656                         }
 657                         else
 658                         {
 659                                 reg2 = GetRegister(FU_REGTWO);
 660                         }
 661                 }
 662
 663                 if (*tok != ')')
 664                         return MalformedOpcode(0x0A);
 665
 666                 tok++;
 667                 at_eol();
 668                 BuildRISCIntructionWord(parm, reg2, reg1);
 669                 break;
 670
 671         // LOADB/LOADP/LOADW (Rn),Rn
 672         case RI_LOADN:
 673                 if (*tok != '(')
 674                         return MalformedOpcode(0x0B);
 675
 676                 tok++;
 677                 reg1 = GetRegister(FU_REGONE);
 678
 679                 if (*tok != ')')
 680                         return MalformedOpcode(0x0C);
 681
 682                 tok++;
 683                 CHECK_COMMA;
 684                 reg2 = GetRegister(FU_REGTWO);
 685                 at_eol();
 686                 BuildRISCIntructionWord(parm, reg1, reg2);
 687                 break;
 688
 689         // STOREB/STOREP/STOREW Rn,(Rn)
 690         case RI_STOREN:
 691                 reg1 = GetRegister(FU_REGONE);
 692                 CHECK_COMMA;
 693
 694                 if (*tok != '(')
 695                         return MalformedOpcode(0x0D);
 696
 697                 tok++;
 698                 reg2 = GetRegister(FU_REGTWO);
 699
 700                 if (*tok != ')')
 701                         return MalformedOpcode(0x0E);
 702
 703                 tok++;
 704                 at_eol();
 705                 BuildRISCIntructionWord(parm, reg2, reg1);
 706                 break;
 707
 708         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 709         case RI_JR:
 710
 711         // Jump Absolute - cc,(Rs) - reg2=cc
 712         case RI_JUMP:
 713                 // Check to see if there is a comma in the token string. If not then
 714                 // the JR or JUMP should default to 0, Jump Always
 715                 commaFound = 0;
 716
 717                 for(t=tok; *t!=EOL; t++)
 718                 {
 719                         if (*t == ',')
 720                         {
 721                                 commaFound = 1;
 722                                 break;
 723                         }
 724                 }
 725
 726                 if (commaFound)
 727                 {
 728                         if (*tok == CONST)
 729                         {
 730                                 // CC using a constant number
 731                                 tok++;
 732                                 val = *tok;
 733                                 tok++;
 734                                 CHECK_COMMA;
 735                         }
 736                         else if (*tok == SYMBOL)
 737                         {
 738                                 val = 99;
 739 //                              strcpy(scratch, (char *)tok[1]);
 740                                 strcpy(scratch, string[tok[1]]);
 741                                 strtoupper(scratch);
 742
 743                                 for(i=0; i<MAXINTERNCC; i++)
 744                                 {
 745                                         // Look for the condition code & break if found
 746                                         if (strcmp(condname[i], scratch) == 0)
 747                                         {
 748                                                 val = condnumber[i];
 749                                                 break;
 750                                         }
 751                                 }
 752
 753                                 // Standard CC was not found, look for an equated one
 754                                 if (val == 99)
 755                                 {
 756 //                                      ccsym = lookup((char *)tok[1], LABEL, 0);
 757                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 758
 759                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 760                                         {
 761                                                 val = ccsym->svalue;
 762                                         }
 763                                         else
 764                                                 return error("unknown condition code");
 765                                 }
 766
 767                                 tok += 2;
 768                                 CHECK_COMMA;
 769                         }
 770                         else if (*tok == '(')
 771                         {
 772                                 // Set CC to "Jump Always"
 773                                 val = 0;
 774                         }
 775                 }
 776                 else
 777                 {
 778                         // Set CC to "Jump Always"
 779                         val = 0;
 780                 }
 781
 782                 if (val < 0 || val > 31)
 783                         return error("condition constant out of range");
 784
 785                 // Store condition code
 786                 reg1 = val;
 787
 788                 if (type == RI_JR)
 789                 {
 790                         // JR cc,n
 791                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 792                                 return MalformedOpcode(0x0F);
 793
 794                         if ((challoc - ch_size) < 4)
 795                                 chcheck(4L);
 796
 797                         if (!(eattr & DEFINED))
 798                         {
 799                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 800                                 reg2 = 0;
 801                         }
 802                         else
 803                         {
 804                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 805
 806                                 if ((reg2 < -16) || (reg2 > 15))
 807                                         error("PC relative overflow");
 808                         }
 809
 810                         BuildRISCIntructionWord(parm, reg2, reg1);
 811                 }
 812                 else
 813                 {
 814                         // JUMP cc, (Rn)
 815                         if (*tok != '(')
 816                                 return MalformedOpcode(0x10);
 817
 818                         tok++;
 819                         reg2 = GetRegister(FU_REGTWO);
 820
 821                         if (*tok != ')')
 822                                 return MalformedOpcode(0x11);
 823
 824                         tok++;
 825                         at_eol();
 826                         BuildRISCIntructionWord(parm, reg2, reg1);
 827                 }
 828
 829                 break;
 830
 831         // Should never get here :-D
 832         default:
 833                 return error("Unknown RISC opcode type");
 834         }
 835
 836         lastOpcode = type;
 837         return 0;
 838 }
 839