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

   1 //
   2 // RMAC - Renamed Macro Assembler for all Atari computers
   3 // RISCA.C - GPU/DSP Assembler
   4 // Copyright (C) 199x Landon Dyer, 2011-2021 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 "rmac.h"
  17 #include "sect.h"
  18 #include "token.h"
  19
  20 #define DEF_MR                          // Declare keyword values
  21 #include "risckw.h"                     // Incl. generated risc keywords
  22
  23 #define DEF_REGRISC
  24 #include "riscregs.h"           // Incl. generated keyword tables & defs
  25
  26 #define MAXINTERNCC 26          // Maximum internal condition codes
  27
  28 // Useful macros
  29 #define EVAL_REG_RETURN_IF_ERROR(x, y) \
  30 x = EvaluateRegisterFromTokenStream(y); \
  31 \
  32 if (x == ERROR) \
  33         return ERROR;
  34
  35 #define EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(x, y) \
  36 x = EvaluateRegisterFromTokenStream(y); \
  37 \
  38 if ((x == ERROR) || (ErrorIfNotAtEOL() == ERROR)) \
  39         return ERROR;
  40
  41 #define CHECK_EOL \
  42 if (ErrorIfNotAtEOL() == ERROR) \
  43         return ERROR;
  44
  45 unsigned altbankok = 0;         // Ok to use alternate register bank
  46 unsigned orgactive = 0;         // RISC/6502 org directive active
  47 unsigned orgaddr = 0;           // Org'd address
  48 unsigned orgwarning = 0;        // Has an ORG warning been issued
  49 int lastOpcode = -1;            // Last RISC opcode assembled
  50 uint8_t riscImmTokenSeen;       // The '#' (immediate) token was seen
  51
  52 static const char reg_err[] = "missing register R0...R31";
  53
  54 // Jaguar jump condition names
  55 static const char condname[MAXINTERNCC][5] = {
  56         "NZ", "Z", "NC", "NCNZ", "NCZ", "C", "CNZ", "CZ", "NN", "NNNZ", "NNZ",
  57         "N", "N_NZ", "N_Z", "T", "A", "NE", "EQ", "CC", "HS", "HI", "CS", "LO",
  58         "PL", "MI", "F"
  59 };
  60
  61 // Jaguar jump condition numbers
  62 static const char condnumber[] = {
  63         1, 2, 4, 5, 6, 8, 9, 10, 20, 21, 22, 24, 25, 26,
  64         0, 0, 1, 2, 4, 4, 5,  8,  8, 20, 24, 31
  65 };
  66
  67 // Opcode Specific Data
  68 struct opcoderecord {
  69         uint16_t state;         // Opcode Name (unused)
  70         uint16_t type;          // Opcode Type
  71         uint16_t param;         // Opcode Parameter
  72 };
  73
  74 static const struct opcoderecord roptbl[] = {
  75         { MR_ADD,     RI_TWO,    0 },
  76         { MR_ADDC,    RI_TWO,    1 },
  77         { MR_ADDQ,    RI_NUM_32, 2 },
  78         { MR_ADDQT,   RI_NUM_32, 3 },
  79         { MR_SUB,     RI_TWO,    4 },
  80         { MR_SUBC,    RI_TWO,    5 },
  81         { MR_SUBQ,    RI_NUM_32, 6 },
  82         { MR_SUBQT,   RI_NUM_32, 7 },
  83         { MR_NEG,     RI_ONE,    8 },
  84         { MR_AND,     RI_TWO,    9 },
  85         { MR_OR,      RI_TWO,    10 },
  86         { MR_XOR,     RI_TWO,    11 },
  87         { MR_NOT,     RI_ONE,    12 },
  88         { MR_BTST,    RI_NUM_31, 13 },
  89         { MR_BSET,    RI_NUM_31, 14 },
  90         { MR_BCLR,    RI_NUM_31, 15 },
  91         { MR_MULT,    RI_TWO,    16 },
  92         { MR_IMULT,   RI_TWO,    17 },
  93         { MR_IMULTN,  RI_TWO,    18 },
  94         { MR_RESMAC,  RI_ONE,    19 },
  95         { MR_IMACN,   RI_TWO,    20 },
  96         { MR_DIV,     RI_TWO,    21 },
  97         { MR_ABS,     RI_ONE,    22 },
  98         { MR_SH,      RI_TWO,    23 },
  99         { MR_SHLQ,    RI_NUM_32, 24 + SUB32 },
 100         { MR_SHRQ,    RI_NUM_32, 25 },
 101         { MR_SHA,     RI_TWO,    26 },
 102         { MR_SHARQ,   RI_NUM_32, 27 },
 103         { MR_ROR,     RI_TWO,    28 },
 104         { MR_RORQ,    RI_NUM_32, 29 },
 105         { MR_ROLQ,    RI_NUM_32, 29 + SUB32 },
 106         { MR_CMP,     RI_TWO,    30 },
 107         { MR_CMPQ,    RI_NUM_15, 31 },
 108         { MR_SAT8,    RI_ONE,    32 + GPUONLY },
 109         { MR_SUBQMOD, RI_NUM_32, 32 + DSPONLY },
 110         { MR_SAT16,   RI_ONE,    33 + GPUONLY },
 111         { MR_SAT16S,  RI_ONE,    33 + DSPONLY },
 112         { MR_MOVEQ,   RI_NUM_31, 35 },
 113         { MR_MOVETA,  RI_TWO,    36 },
 114         { MR_MOVEFA,  RI_TWO,    37 },
 115         { MR_MOVEI,   RI_MOVEI,  38 },
 116         { MR_LOADB,   RI_LOADN,  39 },
 117         { MR_LOADW,   RI_LOADN,  40 },
 118         { MR_LOADP,   RI_LOADN,  42 + GPUONLY },
 119         { MR_SAT32S,  RI_ONE,    42 + DSPONLY },
 120         { MR_STOREB,  RI_STOREN, 45 },
 121         { MR_STOREW,  RI_STOREN, 46 },
 122         { MR_STOREP,  RI_STOREN, 48 + GPUONLY },
 123         { MR_MIRROR,  RI_ONE,    48 + DSPONLY },
 124         { MR_JUMP,    RI_JUMP,   52 },
 125         { MR_JR,      RI_JR,     53 },
 126         { MR_MMULT,   RI_TWO,    54 },
 127         { MR_MTOI,    RI_TWO,    55 },
 128         { MR_NORMI,   RI_TWO,    56 },
 129         { MR_NOP,     RI_NONE,   57 },
 130         { MR_SAT24,   RI_ONE,    62 },
 131         { MR_UNPACK,  RI_ONE,    63 + GPUONLY | (0 << 6) },
 132         { MR_PACK,    RI_ONE,    63 + GPUONLY | (1 << 6) },
 133         { MR_ADDQMOD, RI_NUM_32, 63 + DSPONLY },
 134         { MR_MOVE,    RI_MOVE,   0 },
 135         { MR_LOAD,    RI_LOAD,   0 },
 136         { MR_STORE,   RI_STORE,  0 }
 137 };
 138
 139 #define MALF_NUM                0
 140 #define MALF_EXPR               1
 141 #define MALF_LPAREN             2
 142 #define MALF_RPAREN             3
 143
 144 static const char malform1[] = "missing '#'";
 145 static const char malform2[] = "bad expression";
 146 static const char malform3[] = "missing ')'";
 147 static const char malform4[] = "missing '('";
 148
 149 static const char * malformErr[] = {
 150         malform1, malform2, malform3, malform4
 151 };
 152
 153 //
 154 // Function to return "malformed expression" error
 155 // This is done mainly to remove a bunch of GOTO statements in the parser
 156 //
 157 static inline int MalformedOpcode(int signal)
 158 {
 159         return error("Malformed opcode, %s", malformErr[signal]);
 160 }
 161
 162 //
 163 // Function to return "Illegal Indexed Register" error
 164 // Anyone trying to index something other than R14 or R15
 165 //
 166 static inline int IllegalIndexedRegister(int reg)
 167 {
 168         return error("Attempted index reference with non-indexable register (r%d)", reg - REGRISC_R0);
 169 }
 170
 171 //
 172 // Function to return "Illegal Indexed Register" error for EQUR scenarios
 173 // Trying to use register value within EQUR that isn't 14 or 15
 174 //
 175 static inline int IllegalIndexedRegisterEqur(SYM * sy)
 176 {
 177         return error("Attempted index reference with non-indexable register within EQUR (%s = r%d)", sy->sname, sy->svalue);
 178 }
 179
 180 //
 181 // Build up & deposit RISC instruction word
 182 //
 183 static void DepositRISCInstructionWord(uint16_t opcode, int reg1, int reg2)
 184 {
 185         // Check for absolute address setting
 186         if (!orgwarning && !orgactive)
 187         {
 188                 warn("RISC code generated with no origin defined");
 189                 orgwarning = 1;
 190         }
 191
 192         int value = ((opcode & 0x3F) << 10) + ((reg1 & 0x1F) << 5) + (reg2 & 0x1F);
 193         D_word(value);
 194 }
 195
 196 //
 197 // Evaluate the RISC register from the token stream. Passed in value is the
 198 // FIXUP attribute to use if the expression comes back as undefined.
 199 //
 200 static int EvaluateRegisterFromTokenStream(uint32_t fixup)
 201 {
 202         // Firstly, check to see if it's a register token and return that.  No
 203         // need to invoke expr() for easy cases like this.
 204         int reg = *tok & 255;
 205         if (reg >= REGRISC_R0 && reg <= REGRISC_R31)
 206         {
 207                 reg -= REGRISC_R0;
 208                 tok++;
 209                 return reg;
 210         }
 211
 212         if (*tok != SYMBOL)
 213         {
 214                 // If at this point we don't have a symbol then it's garbage.  Punt.
 215                 return error("Expected register number or EQUREG");
 216         }
 217
 218         uint64_t eval;                          // Expression value
 219         WORD eattr;                                     // Expression attributes
 220         SYM * esym;                                     // External symbol involved in expr.
 221         TOKEN r_expr[EXPRSIZE];         // Expression token list
 222
 223         // Evaluate what's in the global "tok" buffer
 224         // N.B.: We should either get a fixup or a register name from EQUR
 225         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 226                 return ERROR;
 227
 228         if (!(eattr & DEFINED))
 229         {
 230                 AddFixup(FU_WORD | fixup, sloc, r_expr);
 231                 return 0;
 232         }
 233
 234         // We shouldn't get here, that should not be legal
 235         interror(9);
 236         return 0; // Not that this will ever execute, but let's be nice and pacify gcc warnings
 237 }
 238
 239 //
 240 // Do RISC code generation
 241 //
 242 int GenerateRISCCode(int state)
 243 {
 244         int reg1;                                       // Register 1
 245         int reg2;                                       // Register 2
 246         int val = 0;                            // Constructed value
 247         char scratch[80];
 248         SYM * ccsym;
 249         SYM * sy;
 250         int i, commaFound;
 251         TOKEN * t;
 252         uint16_t attrflg;
 253         int indexed;                            // Indexed register flag
 254
 255         uint64_t eval;                          // Expression value
 256         uint16_t eattr;                         // Expression attributes
 257         SYM * esym = NULL;                      // External symbol involved in expr.
 258         TOKEN r_expr[EXPRSIZE];         // Expression token list
 259
 260         // Get opcode parameter and type
 261         uint16_t parm = roptbl[state - 3000].param;
 262         uint16_t type = roptbl[state - 3000].type;
 263         riscImmTokenSeen = 0;           // Set to "token not seen yet"
 264
 265         // Detect whether the opcode parmeter passed determines that the opcode is
 266         // specific to only one of the RISC processors and ensure it is legal in
 267         // the current code section. If not then show error and return.
 268         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 269                 return error("Opcode is not valid in this code section");
 270
 271         // Process RISC opcode
 272         switch (type)
 273         {
 274         // No operand instructions
 275         // NOP (57)
 276         case RI_NONE:
 277                 DepositRISCInstructionWord(parm, 0, 0);
 278                 break;
 279
 280         // Single operand instructions (Rd)
 281         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S,
 282         // UNPACK
 283         case RI_ONE:
 284                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 285                 DepositRISCInstructionWord(parm, parm >> 6, reg2);
 286                 break;
 287
 288         // Two operand instructions (Rs,Rd)
 289         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT,
 290         // MMULT, MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 291         case RI_TWO:
 292                 if (parm == 37)
 293                         altbankok = 1;                      // MOVEFA
 294
 295                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 296                 CHECK_COMMA;
 297
 298                 if (parm == 36)
 299                         altbankok = 1;                      // MOVETA
 300
 301                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 302                 DepositRISCInstructionWord(parm, reg1, reg2);
 303                 break;
 304
 305         // Numeric operand (n,Rd) where n = -16..+15
 306         // CMPQ
 307         case RI_NUM_15:
 308
 309         // Numeric operand (n,Rd) where n = 0..31
 310         // BCLR, BSET, BTST, MOVEQ
 311         case RI_NUM_31:
 312
 313         // Numeric operand (n,Rd) where n = 1..32
 314         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ,
 315         // RORQ
 316         case RI_NUM_32:
 317                 switch (type)
 318                 {
 319                 case RI_NUM_15:
 320                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 321                         break;
 322                 default:
 323                 case RI_NUM_31:
 324                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 325                         break;
 326                 case RI_NUM_32:
 327                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 328                         break;
 329                 }
 330
 331                 if (parm & SUB32)
 332                         attrflg |= FU_SUB32;
 333
 334                 if (*tok != '#')
 335                         return MalformedOpcode(MALF_NUM);
 336
 337                 tok++;
 338                 riscImmTokenSeen = 1;
 339
 340                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 341                         return MalformedOpcode(MALF_EXPR);
 342
 343                 if (!(eattr & DEFINED))
 344                 {
 345                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 346                         reg1 = 0;
 347                 }
 348                 else
 349                 {
 350                         if (esym && (esym->sattre & EQUATEDREG))
 351                                 return error("equated register seen for immediate value");
 352
 353                         if (eattr & RISCREG)
 354                                 return error("register seen for immediate value");
 355
 356                         if (((int)eval < reg1) || ((int)eval > reg2))
 357                                 return error("constant out of range (%d to %d)", reg1, reg2);
 358
 359                         if (parm & SUB32)
 360                                 reg1 = 32 - (int)eval;
 361                         else if (type == RI_NUM_32)
 362                                 reg1 = (reg1 == 32 ? 0 : (int)eval);
 363                         else
 364                                 reg1 = (int)eval;
 365                 }
 366
 367                 CHECK_COMMA;
 368                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 369                 DepositRISCInstructionWord(parm, reg1, reg2);
 370                 break;
 371
 372         // Move Immediate--n,Rn--n in Second Word
 373         case RI_MOVEI:
 374                 if (*tok != '#')
 375                         return MalformedOpcode(MALF_NUM);
 376
 377                 tok++;
 378                 riscImmTokenSeen = 1;
 379
 380                 // Check for equated register after # and return error if so
 381                 if (*tok == SYMBOL)
 382                 {
 383                         sy = lookup(string[tok[1]], LABEL, 0);
 384
 385                         if (sy && (sy->sattre & EQUATEDREG))
 386                                 return error("equated register in 1st operand of MOVEI instruction");
 387                 }
 388
 389                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 390                         return MalformedOpcode(MALF_EXPR);
 391
 392                 if ((lastOpcode == RI_JUMP) || (lastOpcode == RI_JR))
 393                 {
 394                         if (legacy_flag)
 395                         {
 396                                 // User doesn't care, emit a NOP to fix
 397                                 DepositRISCInstructionWord(57, 0, 0);
 398                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 399                         }
 400                         else
 401                                 warn("MOVEI immediately follows JUMP");
 402                 }
 403
 404                 if (!(eattr & DEFINED))
 405                 {
 406                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 407                         eval = 0;
 408                 }
 409                 else
 410                 {
 411                         if (eattr & TDB)
 412                                 MarkRelocatable(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 413                 }
 414
 415                 CHECK_COMMA;
 416                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 417
 418                 DepositRISCInstructionWord(parm, 0, reg2);
 419                 val = WORDSWAP32(eval);
 420                 D_long(val);
 421                 break;
 422
 423         // PC,Rd or Rs,Rd
 424         case RI_MOVE:
 425                 if (*tok == REGRISC_PC)
 426                 {
 427                         parm = 51;
 428                         reg1 = 0;
 429                         tok++;
 430                 }
 431                 else
 432                 {
 433                         parm = 34;
 434                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 435                 }
 436
 437                 CHECK_COMMA;
 438                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 439                 DepositRISCInstructionWord(parm, reg1, reg2);
 440                 break;
 441
 442         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 443         case RI_LOAD:
 444                 indexed = 0;
 445                 parm = 41;
 446
 447                 if (*tok != '(')
 448                         return MalformedOpcode(MALF_LPAREN);
 449
 450                 tok++;
 451
 452         if ((tok[1] == '+') || (tok[1] == '-'))
 453                 {
 454                         // Trying to make indexed call
 455                         if ((*tok == REGRISC_R14) || (*tok == REGRISC_R15))
 456                                 indexed = (*tok - REGRISC_R0);
 457                         else
 458                                 return IllegalIndexedRegister(*tok);
 459                 }
 460
 461                 if (!indexed)
 462                 {
 463                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 464                 }
 465                 else
 466                 {
 467                         reg1 = indexed;
 468                         indexed = 0;
 469                         tok++;
 470
 471                         if (*tok == '+')
 472                         {
 473                                 parm = (WORD)(reg1 - 14 + 58);
 474                                 tok++;
 475
 476                                 if ((*tok >= REGRISC_R0) && (*tok <= REGRISC_R31))
 477                                         indexed = 1;
 478
 479                                 if (*tok == SYMBOL)
 480                                 {
 481                                         sy = lookup(string[tok[1]], LABEL, 0);
 482
 483                                         if (!sy)
 484                                         {
 485                                                 error(reg_err);
 486                                                 return ERROR;
 487                                         }
 488
 489                                         if (sy->sattre & EQUATEDREG)
 490                                                 indexed = 1;
 491                                 }
 492
 493                                 if (indexed)
 494                                 {
 495                                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 496                                 }
 497                                 else
 498                                 {
 499                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 500                                                 return MalformedOpcode(MALF_EXPR);
 501
 502                                         if (!(eattr & DEFINED))
 503                                                 return error("constant expected after '+'");
 504
 505                                         reg1 = (int)eval;
 506
 507                                         if (reg1 == 0)
 508                                         {
 509                                                 reg1 = 14 + (parm - 58);
 510                                                 parm = 41;
 511                                                 warn("NULL offset in LOAD ignored");
 512                                         }
 513                                         else
 514                                         {
 515                                                 if ((reg1 < 1) || (reg1 > 32))
 516                                                         return error("constant in LOAD out of range (1-32)");
 517
 518                                                 if (reg1 == 32)
 519                                                         reg1 = 0;
 520
 521                                                 parm = (WORD)(parm - 58 + 43);
 522                                         }
 523                                 }
 524                         }
 525                         else
 526                         {
 527                                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 528                         }
 529                 }
 530
 531                 if (*tok != ')')
 532                         return MalformedOpcode(MALF_RPAREN);
 533
 534                 tok++;
 535                 CHECK_COMMA;
 536                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 537                 DepositRISCInstructionWord(parm, reg1, reg2);
 538                 break;
 539
 540         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 541         case RI_STORE:
 542                 parm = 47;
 543                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 544                 CHECK_COMMA;
 545
 546                 if (*tok != '(')
 547                         return MalformedOpcode(MALF_LPAREN);
 548
 549                 tok++;
 550                 indexed = 0;
 551
 552                 if (((*tok == REGRISC_R14) || (*tok == REGRISC_R15)) && (tok[1] != ')'))
 553                         indexed = *tok - REGRISC_R0;
 554
 555                 if (!indexed)
 556                 {
 557                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 558                 }
 559                 else
 560                 {
 561                         reg2 = indexed;
 562                         indexed = 0;
 563                         tok++;
 564
 565                         if (*tok == '+')
 566                         {
 567                                 parm = (WORD)(reg2 - 14 + 60);
 568                                 tok++;
 569
 570                                 if ((*tok >= REGRISC_R0) && (*tok <= REGRISC_R31))
 571                                         indexed = 1;
 572
 573                                 if (*tok == SYMBOL)
 574                                 {
 575                                         sy = lookup(string[tok[1]], LABEL, 0);
 576
 577                                         if (!sy)
 578                                         {
 579                                                 error(reg_err);
 580                                                 return ERROR;
 581                                         }
 582
 583                                         if (sy->sattre & EQUATEDREG)
 584                                                 indexed = 1;
 585                                 }
 586
 587                                 if (indexed)
 588                                 {
 589                                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 590                                 }
 591                                 else
 592                                 {
 593                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 594                                                 return MalformedOpcode(MALF_EXPR);
 595
 596                                         if (!(eattr & DEFINED))
 597                                         {
 598                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 599                                                 reg2 = 0;
 600                                         }
 601                                         else
 602                                         {
 603                                                 reg2 = (int)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                                                                 return error("constant in STORE out of range (1-32)");
 615
 616                                                         if (reg2 == 32)
 617                                                                 reg2 = 0;
 618
 619                                                         parm = (WORD)(parm - 60 + 49);
 620                                                 }
 621                                         }
 622                                 }
 623                         }
 624                         else
 625                         {
 626                                 EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 627                         }
 628                 }
 629
 630                 if (*tok != ')')
 631                         return MalformedOpcode(MALF_RPAREN);
 632
 633                 tok++;
 634                 CHECK_EOL;
 635                 DepositRISCInstructionWord(parm, reg2, reg1);
 636                 break;
 637
 638         // LOADB/LOADP/LOADW (Rn),Rn
 639         case RI_LOADN:
 640                 if (*tok != '(')
 641                         return MalformedOpcode(MALF_LPAREN);
 642
 643                 tok++;
 644                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 645
 646                 if (*tok != ')')
 647                         return MalformedOpcode(MALF_RPAREN);
 648
 649                 tok++;
 650                 CHECK_COMMA;
 651                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 652                 DepositRISCInstructionWord(parm, reg1, reg2);
 653                 break;
 654
 655         // STOREB/STOREP/STOREW Rn,(Rn)
 656         case RI_STOREN:
 657                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 658                 CHECK_COMMA;
 659
 660                 if (*tok != '(')
 661                         return MalformedOpcode(MALF_LPAREN);
 662
 663                 tok++;
 664                 EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 665
 666                 if (*tok != ')')
 667                         return MalformedOpcode(MALF_RPAREN);
 668
 669                 tok++;
 670                 CHECK_EOL;
 671                 DepositRISCInstructionWord(parm, reg2, reg1);
 672                 break;
 673
 674         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 675         case RI_JR:
 676
 677         // Jump Absolute - cc,(Rs) - reg2=cc
 678         case RI_JUMP:
 679                 // Check to see if there is a comma in the token string. If not then
 680                 // the JR or JUMP should default to 0, Jump Always
 681                 commaFound = 0;
 682
 683                 for(t=tok; *t!=EOL; t++)
 684                 {
 685                         if (*t == ',')
 686                         {
 687                                 commaFound = 1;
 688                                 break;
 689                         }
 690                 }
 691
 692                 if (commaFound)
 693                 {
 694                         if (*tok == CONST)
 695                         {
 696                                 // CC using a constant number (O_o)
 697                                 PTR tp;
 698                                 tp.tk = tok + 1;
 699                                 val = *tp.i64++;
 700                                 tok = tp.tk;
 701                                 CHECK_COMMA;
 702                         }
 703                         else if (*tok == SYMBOL)
 704                         {
 705                                 val = 9999;
 706                                 strcpy(scratch, string[tok[1]]);
 707                                 strtoupper(scratch);
 708
 709                                 for(i=0; i<MAXINTERNCC; i++)
 710                                 {
 711                                         // Look for the condition code & break if found
 712                                         if (strcmp(condname[i], scratch) == 0)
 713                                         {
 714                                                 val = condnumber[i];
 715                                                 break;
 716                                         }
 717                                 }
 718
 719                                 // Standard CC was not found, look for an equated one
 720                                 if (val == 9999)
 721                                 {
 722                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 723
 724                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 725                                                 val = (int)ccsym->svalue;
 726                                         else
 727                                                 return error("unknown condition code");
 728                                 }
 729
 730                                 tok += 2;
 731                                 CHECK_COMMA;
 732                         }
 733                         else if (*tok == '(')
 734                         {
 735                                 // Set CC to "Jump Always"
 736                                 val = 0;
 737                         }
 738                 }
 739                 else
 740                 {
 741                         // Set CC to "Jump Always"
 742                         val = 0;
 743                 }
 744
 745                 if ((val < 0) || (val > 31))
 746                         return error("condition constant out of range");
 747
 748                 // Store condition code
 749                 reg1 = val;
 750
 751                 if (type == RI_JR)
 752                 {
 753                         // JR cc,n
 754                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 755                                 return MalformedOpcode(MALF_EXPR);
 756
 757                         if (!(eattr & DEFINED))
 758                         {
 759                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 760                                 reg2 = 0;
 761                         }
 762                         else
 763                         {
 764                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 765
 766                                 if ((reg2 < -16) || (reg2 > 15))
 767                                         error("PC relative overflow in JR (outside of -16 to 15)");
 768                         }
 769                 }
 770                 else
 771                 {
 772                         // JUMP cc, (Rn)
 773                         if (*tok != '(')
 774                                 return MalformedOpcode(MALF_LPAREN);
 775
 776                         tok++;
 777                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 778
 779                         if (*tok != ')')
 780                                 return MalformedOpcode(MALF_RPAREN);
 781
 782                         tok++;
 783                         CHECK_EOL;
 784                 }
 785
 786                 DepositRISCInstructionWord(parm, reg2, reg1);
 787                 break;
 788
 789         // We should never get here. If we do, somebody done fucked up. :-D
 790         default:
 791                 return error("Unknown RISC opcode type");
 792         }
 793
 794         lastOpcode = type;
 795         return 0;
 796 }