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 | (1 << 6) },
 132         { MR_PACK,    RI_ONE,    63 + GPUONLY | (0 << 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         GENLINENOSYM();
 194         D_word(value);
 195 }
 196
 197 //
 198 // Evaluate the RISC register from the token stream. Passed in value is the
 199 // FIXUP attribute to use if the expression comes back as undefined.
 200 //
 201 static int EvaluateRegisterFromTokenStream(uint32_t fixup)
 202 {
 203         // Firstly, check to see if it's a register token and return that.  No
 204         // need to invoke expr() for easy cases like this.
 205         int reg = *tok & 255;
 206         if (reg >= REGRISC_R0 && reg <= REGRISC_R31)
 207         {
 208                 reg -= REGRISC_R0;
 209                 tok++;
 210                 return reg;
 211         }
 212
 213         if (*tok != SYMBOL)
 214         {
 215                 // If at this point we don't have a symbol then it's garbage.  Punt.
 216                 return error("Expected register number or EQUREG");
 217         }
 218
 219         uint64_t eval;                          // Expression value
 220         WORD eattr;                                     // Expression attributes
 221         SYM * esym;                                     // External symbol involved in expr.
 222         TOKEN r_expr[EXPRSIZE];         // Expression token list
 223
 224         // Evaluate what's in the global "tok" buffer
 225         // N.B.: We should either get a fixup or a register name from EQUR
 226         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 227                 return ERROR;
 228
 229         if (!(eattr & DEFINED))
 230         {
 231                 AddFixup(FU_WORD | fixup, sloc, r_expr);
 232                 return 0;
 233         }
 234
 235         // We shouldn't get here, that should not be legal
 236         interror(9);
 237         return 0; // Not that this will ever execute, but let's be nice and pacify gcc warnings
 238 }
 239
 240 //
 241 // Do RISC code generation
 242 //
 243 int GenerateRISCCode(int state)
 244 {
 245         int reg1;                                       // Register 1
 246         int reg2;                                       // Register 2
 247         int val = 0;                            // Constructed value
 248         char scratch[80];
 249         SYM * ccsym;
 250         SYM * sy;
 251         int i, commaFound;
 252         TOKEN * t;
 253         uint16_t attrflg;
 254         int indexed;                            // Indexed register flag
 255
 256         uint64_t eval;                          // Expression value
 257         uint16_t eattr;                         // Expression attributes
 258         SYM * esym = NULL;                      // External symbol involved in expr.
 259         TOKEN r_expr[EXPRSIZE];         // Expression token list
 260
 261         // Get opcode parameter and type
 262         uint16_t parm = roptbl[state - 3000].param;
 263         uint16_t type = roptbl[state - 3000].type;
 264         riscImmTokenSeen = 0;           // Set to "token not seen yet"
 265
 266         // Detect whether the opcode parmeter passed determines that the opcode is
 267         // specific to only one of the RISC processors and ensure it is legal in
 268         // the current code section. If not then show error and return.
 269         if (((parm & GPUONLY) && rdsp) || ((parm & DSPONLY) && rgpu))
 270                 return error("Opcode is not valid in this code section");
 271
 272         // Process RISC opcode
 273         switch (type)
 274         {
 275         // No operand instructions
 276         // NOP (57)
 277         case RI_NONE:
 278                 DepositRISCInstructionWord(parm, 0, 0);
 279                 break;
 280
 281         // Single operand instructions (Rd)
 282         // ABS, MIRROR, NEG, NOT, PACK, RESMAC, SAT8, SAT16, SAT16S, SAT24, SAT32S,
 283         // UNPACK
 284         case RI_ONE:
 285                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 286                 DepositRISCInstructionWord(parm, parm >> 6, reg2);
 287                 break;
 288
 289         // Two operand instructions (Rs,Rd)
 290         // ADD, ADDC, AND, CMP, DIV, IMACN, IMULT, IMULTN, MOVEFA, MOVETA, MULT,
 291         // MMULT, MTOI, NORMI, OR, ROR, SH, SHA, SUB, SUBC, XOR
 292         case RI_TWO:
 293                 if (parm == 37)
 294                         altbankok = 1;                      // MOVEFA
 295
 296                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 297                 CHECK_COMMA;
 298
 299                 if (parm == 36)
 300                         altbankok = 1;                      // MOVETA
 301
 302                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 303                 DepositRISCInstructionWord(parm, reg1, reg2);
 304                 break;
 305
 306         // Numeric operand (n,Rd) where n = -16..+15
 307         // CMPQ
 308         case RI_NUM_15:
 309
 310         // Numeric operand (n,Rd) where n = 0..31
 311         // BCLR, BSET, BTST, MOVEQ
 312         case RI_NUM_31:
 313
 314         // Numeric operand (n,Rd) where n = 1..32
 315         // ADDQ, ADDQMOD, ADDQT, SHARQ, SHLQ, SHRQ, SUBQ, SUBQMOD, SUBQT, ROLQ,
 316         // RORQ
 317         case RI_NUM_32:
 318                 switch (type)
 319                 {
 320                 case RI_NUM_15:
 321                         reg1 = -16; reg2 = 15; attrflg = FU_NUM15;
 322                         break;
 323                 default:
 324                 case RI_NUM_31:
 325                         reg1 =   0; reg2 = 31; attrflg = FU_NUM31;
 326                         break;
 327                 case RI_NUM_32:
 328                         reg1 =   1; reg2 = 32; attrflg = FU_NUM32;
 329                         break;
 330                 }
 331
 332                 if (parm & SUB32)
 333                         attrflg |= FU_SUB32;
 334
 335                 if (*tok != '#')
 336                         return MalformedOpcode(MALF_NUM);
 337
 338                 tok++;
 339                 riscImmTokenSeen = 1;
 340
 341                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 342                         return MalformedOpcode(MALF_EXPR);
 343
 344                 if (!(eattr & DEFINED))
 345                 {
 346                         AddFixup((WORD)(FU_WORD | attrflg), sloc, r_expr);
 347                         reg1 = 0;
 348                 }
 349                 else
 350                 {
 351                         if (esym && (esym->sattre & EQUATEDREG))
 352                                 return error("equated register seen for immediate value");
 353
 354                         if (eattr & RISCREG)
 355                                 return error("register seen for immediate value");
 356
 357                         if (((int)eval < reg1) || ((int)eval > reg2))
 358                                 return error("constant out of range (%d to %d)", reg1, reg2);
 359
 360                         if (parm & SUB32)
 361                                 reg1 = 32 - (int)eval;
 362                         else if (type == RI_NUM_32)
 363                                 reg1 = (reg1 == 32 ? 0 : (int)eval);
 364                         else
 365                                 reg1 = (int)eval;
 366                 }
 367
 368                 CHECK_COMMA;
 369                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 370                 DepositRISCInstructionWord(parm, reg1, reg2);
 371                 break;
 372
 373         // Move Immediate--n,Rn--n in Second Word
 374         case RI_MOVEI:
 375                 if (*tok != '#')
 376                         return MalformedOpcode(MALF_NUM);
 377
 378                 tok++;
 379                 riscImmTokenSeen = 1;
 380
 381                 // Check for equated register after # and return error if so
 382                 if (*tok == SYMBOL)
 383                 {
 384                         sy = lookup(string[tok[1]], LABEL, 0);
 385
 386                         if (sy && (sy->sattre & EQUATEDREG))
 387                                 return error("equated register in 1st operand of MOVEI instruction");
 388                 }
 389
 390                 if (expr(r_expr, &eval, &eattr, &esym) != OK)
 391                         return MalformedOpcode(MALF_EXPR);
 392
 393                 if ((lastOpcode == RI_JUMP) || (lastOpcode == RI_JR))
 394                 {
 395                         if (legacy_flag)
 396                         {
 397                                 // User doesn't care, emit a NOP to fix
 398                                 DepositRISCInstructionWord(57, 0, 0);
 399                                 warn("MOVEI following JUMP, inserting NOP to fix your BROKEN CODE");
 400                         }
 401                         else
 402                                 warn("MOVEI immediately follows JUMP");
 403                 }
 404
 405                 if (!(eattr & DEFINED))
 406                 {
 407                         AddFixup(FU_LONG | FU_MOVEI, sloc + 2, r_expr);
 408                         eval = 0;
 409                 }
 410                 else
 411                 {
 412                         if (eattr & TDB)
 413                                 MarkRelocatable(cursect, sloc + 2, (eattr & TDB), (MLONG | MMOVEI), NULL);
 414                 }
 415
 416                 CHECK_COMMA;
 417                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 418
 419                 DepositRISCInstructionWord(parm, 0, reg2);
 420                 val = WORDSWAP32(eval);
 421                 D_long(val);
 422                 break;
 423
 424         // PC,Rd or Rs,Rd
 425         case RI_MOVE:
 426                 if (*tok == REGRISC_PC)
 427                 {
 428                         parm = 51;
 429                         reg1 = 0;
 430                         tok++;
 431                 }
 432                 else
 433                 {
 434                         parm = 34;
 435                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 436                 }
 437
 438                 CHECK_COMMA;
 439                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 440                 DepositRISCInstructionWord(parm, reg1, reg2);
 441                 break;
 442
 443         // (Rn),Rn = 41 / (R14/R15+n),Rn = 43/44 / (R14/R15+Rn),Rn = 58/59
 444         case RI_LOAD:
 445                 indexed = 0;
 446                 parm = 41;
 447
 448                 if (*tok != '(')
 449                         return MalformedOpcode(MALF_LPAREN);
 450
 451                 tok++;
 452
 453         if ((tok[1] == '+') || (tok[1] == '-'))
 454                 {
 455                         // Trying to make indexed call
 456                         if ((*tok == REGRISC_R14) || (*tok == REGRISC_R15))
 457                                 indexed = (*tok - REGRISC_R0);
 458                         else
 459                                 return IllegalIndexedRegister(*tok);
 460                 }
 461
 462                 if (!indexed)
 463                 {
 464                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 465                 }
 466                 else
 467                 {
 468                         reg1 = indexed;
 469                         indexed = 0;
 470                         tok++;
 471
 472                         if (*tok == '+')
 473                         {
 474                                 parm = (WORD)(reg1 - 14 + 58);
 475                                 tok++;
 476
 477                                 if ((*tok >= REGRISC_R0) && (*tok <= REGRISC_R31))
 478                                         indexed = 1;
 479
 480                                 if (*tok == SYMBOL)
 481                                 {
 482                                         sy = lookup(string[tok[1]], LABEL, 0);
 483
 484                                         if (!sy)
 485                                         {
 486                                                 error(reg_err);
 487                                                 return ERROR;
 488                                         }
 489
 490                                         if (sy->sattre & EQUATEDREG)
 491                                                 indexed = 1;
 492                                 }
 493
 494                                 if (indexed)
 495                                 {
 496                                         EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 497                                 }
 498                                 else
 499                                 {
 500                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 501                                                 return MalformedOpcode(MALF_EXPR);
 502
 503                                         if (!(eattr & DEFINED))
 504                                                 return error("constant expected after '+'");
 505
 506                                         reg1 = (int)eval;
 507
 508                                         if (reg1 == 0)
 509                                         {
 510                                                 reg1 = 14 + (parm - 58);
 511                                                 parm = 41;
 512                                                 warn("NULL offset in LOAD ignored");
 513                                         }
 514                                         else
 515                                         {
 516                                                 if ((reg1 < 1) || (reg1 > 32))
 517                                                         return error("constant in LOAD out of range (1-32)");
 518
 519                                                 if (reg1 == 32)
 520                                                         reg1 = 0;
 521
 522                                                 parm = (WORD)(parm - 58 + 43);
 523                                         }
 524                                 }
 525                         }
 526                         else
 527                         {
 528                                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 529                         }
 530                 }
 531
 532                 if (*tok != ')')
 533                         return MalformedOpcode(MALF_RPAREN);
 534
 535                 tok++;
 536                 CHECK_COMMA;
 537                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 538                 DepositRISCInstructionWord(parm, reg1, reg2);
 539                 break;
 540
 541         // Rn,(Rn) = 47 / Rn,(R14/R15+n) = 49/50 / Rn,(R14/R15+Rn) = 60/61
 542         case RI_STORE:
 543                 parm = 47;
 544                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 545                 CHECK_COMMA;
 546
 547                 if (*tok != '(')
 548                         return MalformedOpcode(MALF_LPAREN);
 549
 550                 tok++;
 551                 indexed = 0;
 552
 553                 if (((*tok == REGRISC_R14) || (*tok == REGRISC_R15)) && (tok[1] != ')'))
 554                         indexed = *tok - REGRISC_R0;
 555
 556                 if (!indexed)
 557                 {
 558                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 559                 }
 560                 else
 561                 {
 562                         reg2 = indexed;
 563                         indexed = 0;
 564                         tok++;
 565
 566                         if (*tok == '+')
 567                         {
 568                                 parm = (WORD)(reg2 - 14 + 60);
 569                                 tok++;
 570
 571                                 if ((*tok >= REGRISC_R0) && (*tok <= REGRISC_R31))
 572                                         indexed = 1;
 573
 574                                 if (*tok == SYMBOL)
 575                                 {
 576                                         sy = lookup(string[tok[1]], LABEL, 0);
 577
 578                                         if (!sy)
 579                                         {
 580                                                 error(reg_err);
 581                                                 return ERROR;
 582                                         }
 583
 584                                         if (sy->sattre & EQUATEDREG)
 585                                                 indexed = 1;
 586                                 }
 587
 588                                 if (indexed)
 589                                 {
 590                                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 591                                 }
 592                                 else
 593                                 {
 594                                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 595                                                 return MalformedOpcode(MALF_EXPR);
 596
 597                                         if (!(eattr & DEFINED))
 598                                         {
 599                                                 AddFixup(FU_WORD | FU_REGTWO, sloc, r_expr);
 600                                                 reg2 = 0;
 601                                         }
 602                                         else
 603                                         {
 604                                                 reg2 = (int)eval;
 605
 606                                                 if (reg2 == 0)
 607                                                 {
 608                                                         reg2 = 14 + (parm - 60);
 609                                                         parm = 47;
 610                                                         warn("NULL offset in STORE ignored");
 611                                                 }
 612                                                 else
 613                                                 {
 614                                                         if ((reg2 < 1) || (reg2 > 32))
 615                                                                 return error("constant in STORE out of range (1-32)");
 616
 617                                                         if (reg2 == 32)
 618                                                                 reg2 = 0;
 619
 620                                                         parm = (WORD)(parm - 60 + 49);
 621                                                 }
 622                                         }
 623                                 }
 624                         }
 625                         else
 626                         {
 627                                 EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 628                         }
 629                 }
 630
 631                 if (*tok != ')')
 632                         return MalformedOpcode(MALF_RPAREN);
 633
 634                 tok++;
 635                 CHECK_EOL;
 636                 DepositRISCInstructionWord(parm, reg2, reg1);
 637                 break;
 638
 639         // LOADB/LOADP/LOADW (Rn),Rn
 640         case RI_LOADN:
 641                 if (*tok != '(')
 642                         return MalformedOpcode(MALF_LPAREN);
 643
 644                 tok++;
 645                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 646
 647                 if (*tok != ')')
 648                         return MalformedOpcode(MALF_RPAREN);
 649
 650                 tok++;
 651                 CHECK_COMMA;
 652                 EVAL_REG_RETURN_IF_ERROR_OR_NO_EOL(reg2, FU_REGTWO);
 653                 DepositRISCInstructionWord(parm, reg1, reg2);
 654                 break;
 655
 656         // STOREB/STOREP/STOREW Rn,(Rn)
 657         case RI_STOREN:
 658                 EVAL_REG_RETURN_IF_ERROR(reg1, FU_REGONE);
 659                 CHECK_COMMA;
 660
 661                 if (*tok != '(')
 662                         return MalformedOpcode(MALF_LPAREN);
 663
 664                 tok++;
 665                 EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 666
 667                 if (*tok != ')')
 668                         return MalformedOpcode(MALF_RPAREN);
 669
 670                 tok++;
 671                 CHECK_EOL;
 672                 DepositRISCInstructionWord(parm, reg2, reg1);
 673                 break;
 674
 675         // Jump Relative - cc,n - n=-16..+15 words, reg2=cc
 676         case RI_JR:
 677
 678         // Jump Absolute - cc,(Rs) - reg2=cc
 679         case RI_JUMP:
 680                 // Check to see if there is a comma in the token string. If not then
 681                 // the JR or JUMP should default to 0, Jump Always
 682                 commaFound = 0;
 683
 684                 for(t=tok; *t!=EOL; t++)
 685                 {
 686                         if (*t == ',')
 687                         {
 688                                 commaFound = 1;
 689                                 break;
 690                         }
 691                 }
 692
 693                 if (commaFound)
 694                 {
 695                         if (*tok == CONST)
 696                         {
 697                                 // CC using a constant number (O_o)
 698                                 PTR tp;
 699                                 tp.tk = tok + 1;
 700                                 val = *tp.i64++;
 701                                 tok = tp.tk;
 702                                 CHECK_COMMA;
 703                         }
 704                         else if (*tok == SYMBOL)
 705                         {
 706                                 val = 9999;
 707                                 strcpy(scratch, string[tok[1]]);
 708                                 strtoupper(scratch);
 709
 710                                 for(i=0; i<MAXINTERNCC; i++)
 711                                 {
 712                                         // Look for the condition code & break if found
 713                                         if (strcmp(condname[i], scratch) == 0)
 714                                         {
 715                                                 val = condnumber[i];
 716                                                 break;
 717                                         }
 718                                 }
 719
 720                                 // Standard CC was not found, look for an equated one
 721                                 if (val == 9999)
 722                                 {
 723                                         ccsym = lookup(string[tok[1]], LABEL, 0);
 724
 725                                         if (ccsym && (ccsym->sattre & EQUATEDCC) && !(ccsym->sattre & UNDEF_CC))
 726                                                 val = (int)ccsym->svalue;
 727                                         else
 728                                                 return error("unknown condition code");
 729                                 }
 730
 731                                 tok += 2;
 732                                 CHECK_COMMA;
 733                         }
 734                         else if (*tok == '(')
 735                         {
 736                                 // Set CC to "Jump Always"
 737                                 val = 0;
 738                         }
 739                 }
 740                 else
 741                 {
 742                         // Set CC to "Jump Always"
 743                         val = 0;
 744                 }
 745
 746                 if ((val < 0) || (val > 31))
 747                         return error("condition constant out of range");
 748
 749                 // Store condition code
 750                 reg1 = val;
 751
 752                 if (type == RI_JR)
 753                 {
 754                         // JR cc,n
 755                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 756                                 return MalformedOpcode(MALF_EXPR);
 757
 758                         if (!(eattr & DEFINED))
 759                         {
 760                                 AddFixup(FU_WORD | FU_JR, sloc, r_expr);
 761                                 reg2 = 0;
 762                         }
 763                         else
 764                         {
 765                                 reg2 = ((int)(eval - ((orgactive ? orgaddr : sloc) + 2))) / 2;
 766
 767                                 if ((reg2 < -16) || (reg2 > 15))
 768                                         error("PC relative overflow in JR (outside of -16 to 15)");
 769                         }
 770                 }
 771                 else
 772                 {
 773                         // JUMP cc, (Rn)
 774                         if (*tok != '(')
 775                                 return MalformedOpcode(MALF_LPAREN);
 776
 777                         tok++;
 778                         EVAL_REG_RETURN_IF_ERROR(reg2, FU_REGTWO);
 779
 780                         if (*tok != ')')
 781                                 return MalformedOpcode(MALF_RPAREN);
 782
 783                         tok++;
 784                         CHECK_EOL;
 785                 }
 786
 787                 DepositRISCInstructionWord(parm, reg2, reg1);
 788                 break;
 789
 790         // We should never get here. If we do, somebody done fucked up. :-D
 791         default:
 792                 return error("Unknown RISC opcode type");
 793         }
 794
 795         lastOpcode = type;
 796         return 0;
 797 }