Shamusworld >> Repos - rmac/blob - parmode.h

   1 //
   2 // RMAC - Reboot's Macro Assembler for all Atari computers
   3 // PARMODE.C - Addressing Modes Parser Include
   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 // This file is included (twice) to parse two addressing modes, into slightly
  10 // different var names
  11 {
  12         // Dn
  13         // An
  14         // # expression
  15         if ((*tok >= KW_D0) && (*tok <= KW_D7))
  16         {
  17                 AMn = DREG;
  18                 AnREG = *tok++ & 7;
  19         }
  20         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
  21         {
  22                 AMn = AREG;
  23                 AnREG = *tok++ & 7;
  24         }
  25         else if (*tok == '#')
  26         {
  27                 tok++;
  28
  29                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
  30                         return ERROR;
  31
  32                 AMn = IMMED;
  33         }
  34
  35         // Small problem with this is that the opening parentheses might be an
  36         // expression that's part of a displacement; this code will falsely flag
  37         // that as an error.
  38
  39         // (An)
  40         // (An)+
  41         // (An,Xn[.siz][*scale])
  42         // (PC,Xn[.siz][*scale])
  43         // (d16,An)
  44         // (d8,An,Xn[.siz][*scale])
  45         // (d16,PC)
  46         // (d8,PC,Xn[.siz][*scale])
  47         // ([bd,An],Xn,od)
  48         // ([bd,An,Xn],od)
  49         // ([bd,PC],Xn,od)
  50         // ([bd,PC,Xn],od)
  51         else if (*tok == '(')
  52         {
  53                 tok++;
  54
  55                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
  56                 {
  57                         AnREG = *tok++ & 7;
  58
  59                         if (*tok == ')')
  60                         {
  61                                 tok++;
  62
  63                                 if (*tok == '+')
  64                                 {
  65                                         tok++;
  66                                         AMn = APOSTINC;
  67                                 }
  68                                 else
  69                                         AMn = AIND;
  70
  71                                 goto AnOK;
  72                         }
  73
  74                         AMn = AINDEXED;
  75                         goto AMn_IX0;            // Handle ",Xn[.siz][*scale])"
  76                 }
  77                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
  78                 {
  79                         //Since index register isn't used here, store register number in this field
  80                         AnIXREG = *tok++ & 7;                                // (Dn)
  81                         if (*tok == ')')
  82                         {
  83                                 tok++;
  84                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
  85                                 AnEXTEN |= EXT_BS;          // Base register suppressed
  86                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
  87                                 AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
  88                                 AMn= MEMPOST;
  89                                 AnREG = 6 << 3;         // stuff 110 to mode field
  90                                 goto AnOK;
  91                         }
  92                         else if (*tok == 'L')
  93                         {
  94                                 // TODO: does DINDL gets used at all?
  95                                 AMn=DINDL;                                     // (Dn.l)
  96                                 AnEXTEN = 1 << 1;   // Long index size
  97                                 tok++;
  98                         }
  99                         else if (*tok == 'W')                                // (Dn.w)
 100                         {
 101                                 // TODO: does DINDW gets used at all?
 102                                 AMn=DINDW;
 103                                 AnEXTEN = 1 << 1;   // Word index size
 104                                 tok++;
 105                         }
 106                         else if (*tok == ',')
 107                         {
 108                                 // ([bd,An],Xn..) without bd, An
 109                                 // Base displacement is suppressed
 110                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
 111                                 AnEXTEN |= EXT_BS;          // Base register suppressed
 112                                 AnEXTEN |= EXT_BDSIZE0;
 113                                 AnREG = 6 << 3;         // stuff 110 to mode field
 114                                 tok++;
 115                                 goto CHECKODn;
 116                         }
 117                         else
 118                         {
 119                                 return error("(Dn) error");
 120                         }
 121
 122                         if (*tok == '*')
 123                         {                        // scale: *1, *2, *4, *8
 124                                 tok++;
 125
 126                                 if (*tok == SYMBOL)
 127                                 {
 128                                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 129                                                 return error("scale factor expression must evaluate");
 130
 131                                         switch (AnEXVAL)
 132                                         {
 133                                         case 1:
 134                                                 break;
 135                                         case 2:
 136                                                 AnIXSIZ |= TIMES2;
 137                                                 break;
 138                                         case 4:
 139                                                 AnIXSIZ |= TIMES4;
 140                                                 break;
 141                                         case 8:
 142                                                 AnIXSIZ |= TIMES8;
 143                                                 break;
 144                                         default:
 145                                                 goto badmode;
 146                                         }
 147                                 }
 148                                 else if (*tok++ != CONST || *tok > 8)
 149                                         goto badmode;
 150                                 else
 151                                 {
 152                                         switch ((int)*tok++)
 153                                         {
 154                                         case 1:
 155                                                 break;
 156                                         case 2:
 157                                                 AnIXSIZ |= TIMES2;
 158                                                 break;
 159                                         case 4:
 160                                                 AnIXSIZ |= TIMES4;
 161                                                 break;
 162                                         case 8:
 163                                                 AnIXSIZ |= TIMES8;
 164                                                 break;
 165                                         default:
 166                                                 goto badmode;
 167                                         }
 168                                 }
 169                         }
 170
 171                         if (*tok == ')')
 172                         {
 173                                 tok++;
 174                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
 175                                 AnEXTEN |= EXT_BS;          // Base register suppressed
 176                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
 177                                 AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
 178                                 AnREG = 6 << 3;         // stuff 110 to mode field
 179                                 AMn = MEMPOST;
 180                                 goto AnOK;
 181                         }
 182                         else if (*tok==',')
 183                         {
 184                                 tok++;  // eat the comma
 185                                 // It might be (Dn[.wl][*scale],od)
 186                                 // Maybe this is wrong and we have to write some code here
 187                                 // instead of reusing that path...
 188                                 goto CHECKODn;
 189                         }
 190                         else
 191                                 return error("unhandled so far");
 192                 }
 193                 else if (*tok == KW_PC)
 194                 {                            // (PC,Xn[.siz][*scale])
 195                         tok++;
 196                         AMn = PCINDEXED;
 197
 198                         // Common index handler; enter here with 'tok' pointing at the
 199                         // comma.
 200
 201                         AMn_IX0:                 // Handle indexed with missing expr
 202
 203                         AnEXVAL = 0;
 204                         AnEXATTR = ABS | DEFINED;
 205
 206                         AMn_IXN:                 // Handle any indexed (tok -> a comma)
 207
 208                         if (*tok++ != ',')
 209                                 goto badmode;
 210
 211                         if (*tok < KW_D0 || *tok > KW_A7)
 212                                 goto badmode;
 213
 214                         AnIXREG = *tok++ & 15;
 215
 216                         switch ((int)*tok)
 217                         {                        // Index reg size: <empty> | .W | .L
 218                         case DOTW:
 219                                 tok++;
 220                         default:
 221                                 AnIXSIZ = 0;
 222                                 break;
 223                         case DOTL:
 224                                 AnIXSIZ = 0x0800;
 225                                 tok++;
 226                                 break;
 227                         case DOTB:               // .B not allowed here...
 228                                 goto badmode;
 229                         }
 230
 231                         if (*tok == '*')
 232                         {                        // scale: *1, *2, *4, *8
 233                                 tok++;
 234
 235                                 if (*tok == SYMBOL)
 236                                 {
 237                                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 238                                                 return error("scale factor expression must evaluate");
 239
 240                                         switch (AnEXVAL)
 241                                         {
 242                                         case 1:
 243                                                 break;
 244                                         case 2:
 245                                                 AnIXSIZ |= TIMES2;
 246                                                 break;
 247                                         case 4:
 248                                                 AnIXSIZ |= TIMES4;
 249                                                 break;
 250                                         case 8:
 251                                                 AnIXSIZ |= TIMES8;
 252                                                 break;
 253                                         default:
 254                                                 goto badmode;
 255                                         }
 256                                 }
 257                                 else if (*tok++ != CONST || *tok > 8)
 258                                         goto badmode;
 259                                 else
 260                                 {
 261                                         switch ((int)*tok++)
 262                                         {
 263                                         case 1:
 264                                                 break;
 265                                         case 2:
 266                                                 AnIXSIZ |= TIMES2;
 267                                                 break;
 268                                         case 4:
 269                                                 AnIXSIZ |= TIMES4;
 270                                                 break;
 271                                         case 8:
 272                                                 AnIXSIZ |= TIMES8;
 273                                                 break;
 274                                         default:
 275                                                 goto badmode;
 276                                         }
 277                                 }
 278                         }
 279
 280                         if (*tok == ',')
 281                         {
 282                                 tok++;
 283                                 goto CHECKODn;
 284                         }
 285                         if (*tok++ != ')')         // final ")"
 286                                 goto badmode;
 287
 288                         goto AnOK;
 289                 }
 290                 else if (*tok == '[')
 291                 {                              // ([...
 292                         tok++;
 293                         AnEXTEN|=EXT_FULLWORD;     //Definitely using full extension format, so set bit 8
 294                         // Check to see if base displacement is present
 295                         //WARNING("expr will return a bad expression error here but this is expected, it needs to be silenced!");
 296                         if (*tok!=CONST && *tok !=SYMBOL)
 297                         //if (expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM) != OK)
 298                         {
 299                                 AnEXTEN|=EXT_BDSIZE0;
 300                                 //tok++;
 301                                 //tok--;                 //Rewind tok since expr advances it forward
 302                         }
 303                         else
 304                         {
 305                                 expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
 306                                 if (CHECK_OPTS(OPT_BASE_DISP) && AnBEXVAL==0 && AnEXATTR!=0)
 307                                 {
 308                                         // bd=0 so let's optimise it out
 309                                         AnEXTEN|=EXT_BDSIZE0;
 310                                 }
 311                                 else if (*tok==DOTL)
 312                                 {                                               // ([bd.l,...
 313                                                 AnEXTEN|=EXT_BDSIZEL;
 314                                                 tok++;
 315                                 }
 316                                 else
 317                                 {                                               // ([bd[.w],... or ([bd,...
 318                                         // Is .W forced here?
 319                                         if (*tok == DOTW)
 320                                         {
 321                                         AnEXTEN|=EXT_BDSIZEW;
 322                                                 tok++;
 323                                         }
 324                                         else
 325                                         {
 326                                                 // Defined, absolute values from $FFFF8000..$00007FFF get optimized
 327                                                 // to absolute short
 328                                                 if (CHECK_OPTS(OPT_ABS_SHORT)
 329                                                         && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
 330                                                         && ((AnBEXVAL + 0x8000) < 0x10000))
 331                                                 {
 332                                                         AnEXTEN |= EXT_BDSIZEW;
 333                                                         warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
 334                                                 }
 335                                                 else
 336                                                 {
 337                                                         AnEXTEN |= EXT_BDSIZEL;
 338                                                 }
 339                                         }
 340                                 }
 341
 342                                 if (*tok == ',')
 343                                         tok++;
 344                                 //else
 345                                 //      return error("Comma expected after base displacement");
 346                         }
 347
 348                         // Check for address register or PC, suppress base register
 349                         // otherwise
 350
 351                         if (*tok == KW_PC)
 352                         {                                       // ([bd,PC,...
 353                                 AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
 354                                 tok++;
 355                         }
 356                         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
 357                         {                                       // ([bd,An,...
 358                                 AnREG = (6<<3)|*tok & 7;
 359                                 tok++;
 360                         }
 361                         else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 362                         {
 363                                 // ([bd,Dn,...
 364                                 AnREG = (6 << 3);
 365                                 AnEXTEN |= ((*tok & 7) << 12);
 366                                 AnEXTEN |= EXT_D;
 367                                 AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
 368                                 tok++;
 369
 370                                 // Check for size
 371                                 {
 372                                         // ([bd,An/PC],Xn.W/L...)
 373                                         switch ((int)*tok)
 374                                         {
 375                                         // Index reg size: <empty> | .W | .L
 376                                         case DOTW:
 377                                                 tok++;
 378                                                 break;
 379                                         default:
 380                                                 break;
 381                                         case DOTL:
 382                                                 AnEXTEN |= EXT_L;
 383                                                 tok++;
 384                                                 break;
 385                                         case DOTB:
 386                                                 // .B not allowed here...
 387                                                 goto badmode;
 388                                         }
 389                                 }
 390
 391                                 // Check for scale
 392                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 393                                 {                           // scale: *1, *2, *4, *8
 394                                         tok++;
 395
 396                                         if (*tok == SYMBOL)
 397                                         {
 398                                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 399                                                         return error("scale factor expression must evaluate");
 400                                                 switch (AnEXVAL)
 401                                                 {
 402                                                 case 1:
 403                                                         break;
 404                                                 case 2:
 405                                                         AnIXSIZ |= TIMES2;
 406                                                         break;
 407                                                 case 4:
 408                                                         AnIXSIZ |= TIMES4;
 409                                                         break;
 410                                                 case 8:
 411                                                         AnIXSIZ |= TIMES8;
 412                                                         break;
 413                                                 default:
 414                                                         goto badmode;
 415                                 }
 416                                         }
 417                                         else if (*tok++ != CONST || *tok > 8)
 418                                                 goto badmode;
 419                                         else
 420                                         {
 421                                                 switch ((int)*tok++)
 422                                                 {
 423                                                 case 1:
 424                                                         break;
 425                                                 case 2:
 426                                                         AnIXSIZ |= TIMES2;
 427                                                         break;
 428                                                 case 4:
 429                                                         AnIXSIZ |= TIMES4;
 430                                                         break;
 431                                                 case 8:
 432                                                         AnIXSIZ |= TIMES8;
 433                                                         break;
 434                                                 default:
 435                                                         goto badmode;
 436                                                 }
 437                                         }
 438                                 }
 439                                 if (*tok == ']')  // ([bd,Dn]...
 440                                 {
 441                                         tok++;
 442                                         goto IS_SUPPRESSEDn;
 443                                 }
 444                         }
 445                         else if (*tok == ']')
 446                         {
 447                                 // PC and Xn is suppressed
 448                                 AnREG = 6 << 3;         // stuff 110 to mode field
 449                                 //AnEXTEN|=EXT_BS|EXT_IS;
 450                                 AnEXTEN |= EXT_BS;
 451                         }
 452                         else
 453                         {
 454                                 goto badmode;
 455                         }
 456
 457                         // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
 458                         if (*tok == ']')
 459                         {
 460                                 //([bd,An/PC],Xn,od)
 461                                 // Check for Xn
 462                                 tok++;
 463
 464                                 if (*tok == ')')
 465                                 {
 466                                         //Xn and od are non existent, get out of jail free card
 467                                         tok++;
 468                                         AMn = MEMPRE;                   // ([bc,An,Xn],od) with no Xn and od
 469                                         AnEXTEN |= EXT_IS | EXT_IISPREN;        //Suppress Xn and od
 470                                         goto AnOK;
 471                                 }
 472                                 else if (*tok != ',')
 473                                         return error("comma expected after ]");
 474                                 else
 475                                         tok++;                          // eat the comma
 476
 477                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 478                                 {
 479                                         AnIXREG = ((*tok & 7) << 12);
 480                                         AnEXTEN |= EXT_A;
 481                                         tok++;
 482                                 }
 483                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 484                                 {
 485                                         AnEXTEN |= ((*tok & 7) << 12);
 486                                         AnEXTEN |= EXT_D;
 487                                         tok++;
 488                                 }
 489                                 else
 490                                 {
 491                                         //No index found, suppress it
 492                                         AnEXTEN |= EXT_IS;
 493                                         tok--;                                  // Rewind tok to point to the comma
 494                                         goto IS_SUPPRESSEDn;    // https://xkcd.com/292/ - what does he know anyway?
 495                                 }
 496
 497                                 // Check for size
 498                                 {
 499                                         // ([bd,An/PC],Xn.W/L...)
 500                                         switch ((int)*tok)
 501                                         {
 502                                         // Index reg size: <empty> | .W | .L
 503                                         case DOTW:
 504                                                 tok++;
 505                                                 break;
 506                                         default:
 507                                                 break;
 508                                         case DOTL:
 509                                                 AnEXTEN |= EXT_L;
 510                                                 tok++;
 511                                                 break;
 512                                         case DOTB:
 513                                                 // .B not allowed here...
 514                                                 goto badmode;
 515                                         }
 516                                 }
 517
 518                                 // Check for scale
 519                                 if (*tok == '*')                   // ([bd,An/PC],Xn*...)
 520                                 {                                  // scale: *1, *2, *4, *8
 521                                         tok++;
 522
 523                                         if (*tok == SYMBOL)
 524                                         {
 525                                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 526                                                         return error("scale factor expression must evaluate");
 527
 528                                                 switch (AnEXVAL)
 529                                                 {
 530                                                 case 1:
 531                                                         break;
 532                                                 case 2:
 533                                                         AnIXSIZ |= TIMES2;
 534                                                         break;
 535                                                 case 4:
 536                                                         AnIXSIZ |= TIMES4;
 537                                                         break;
 538                                                 case 8:
 539                                                         AnIXSIZ |= TIMES8;
 540                                                         break;
 541                                                 default:
 542                                                         goto badmode;
 543                                                 }
 544                                         }
 545                                         else if (*tok++ != CONST || *tok > 8)
 546                                                 goto badmode;
 547                                         else
 548                                         {
 549                                                 switch ((int)*tok++)
 550                                                 {
 551                                                 case 1:
 552                                                         break;
 553                                                 case 2:
 554                                                         AnIXSIZ |= TIMES2;
 555                                                         break;
 556                                                 case 4:
 557                                                         AnIXSIZ |= TIMES4;
 558                                                         break;
 559                                                 case 8:
 560                                                         AnIXSIZ |= TIMES8;
 561                                                         break;
 562                                                 default:
 563                                                         goto badmode;
 564                                                 }
 565                                         }
 566                                 }
 567
 568                                 // Check for od
 569                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 570                                 {
 571                                         //od is non existant, get out of jail free card
 572                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 573                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 574                                         tok++;
 575                                         goto AnOK;
 576                                 }
 577                                 else if (*tok!=',')
 578                                         return error("comma expected");
 579                                 else
 580                                         tok++;  // eat the comma
 581
 582                                 CHECKODn:
 583                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 584                                         goto badmode;
 585
 586                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 587                                 {
 588                                         // od=0 so optimise it out
 589                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 590                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 591                                         tok++;
 592                                         goto AnOK;
 593                                 }
 594                                 // ([bd,An/PC],Xn,od)
 595                                 if (*tok == DOTL)
 596                                 {
 597                                         // expr.L
 598                                         AnEXTEN |= EXT_IISPOSL; // Long outer displacement
 599                                         AMn = MEMPOST;
 600                                         tok++;
 601
 602                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 603                                         // optimized to absolute short
 604                                         if (CHECK_OPTS(OPT_ABS_SHORT)
 605                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 606                                                 && ((AnEXVAL + 0x8000) < 0x10000))
 607                                         {
 608                                                 AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 609                                                 AMn = MEMPOST;
 610                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 611                                         }
 612
 613                                 }
 614                                 else
 615                                 {
 616                                         // expr[.W]
 617                                         AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 618                                         AMn = MEMPOST;
 619
 620                                         // Is .W forced here?
 621                                         if (*tok == DOTW)
 622                                         {
 623                                                 tok++;
 624                                         }
 625                                 }
 626
 627                                 // Check for final closing parenthesis
 628                                 if (*tok == ')')
 629                                 {
 630                                         tok++;
 631                                         goto AnOK;
 632                                 }
 633                                 else
 634                                         return error("Closing parenthesis missing on addressing mode");
 635
 636                                 IS_SUPPRESSEDn:
 637
 638                                 // Check for od
 639                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 640                                 {
 641                                         //od is non existant, get out of jail free card
 642                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 643                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 644                                         tok++;
 645                                         goto AnOK;
 646                                 }
 647                                 else if (*tok!=',')
 648                                         return error("comma expected");
 649                                 else
 650                                         tok++;  // eat the comma
 651
 652                 if ((*tok != CONST) && (*tok != SYMBOL))
 653                                         goto badmode;
 654
 655                                 expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
 656
 657                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 658                                 {
 659                                         // od=0 so optimise it out
 660                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 661                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 662                                         tok++;
 663                                         goto AnOK;
 664                                 }
 665
 666                                 // ([bd,An/PC],Xn,od)
 667                                 if (*tok == DOTL)
 668                                 {
 669                                         // expr.L
 670                                         tok++;
 671                                         AMn = MEMPOST;
 672                                         AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
 673                                 }
 674                                 else
 675                                 {
 676                                         // expr[.W][]
 677                                         AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
 678                                         AMn = MEMPRE;
 679                                         if (*tok == DOTW)
 680                                         {
 681                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
 682                                                 AMn = MEMPOST;
 683                                                 tok++;
 684                                         }
 685
 686                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 687                                         // optimized to absolute short
 688                                         else if (CHECK_OPTS(OPT_BASE_DISP)
 689                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 690                                                 && ((AnEXVAL + 0x8000) < 0x10000))
 691                                         {
 692                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
 693                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 694                                         }
 695                                 }
 696
 697                                 // Check for final closing parenthesis
 698                                 if (*tok == ')')
 699                                 {
 700                                         tok++;
 701                                         goto AnOK;
 702                                 }
 703                                 else
 704                                         return error("Closing parenthesis missing on addressing mode");
 705                         }
 706                         else if (*tok == ',')
 707                         {
 708                                 *tok++;                 // ([bd,An,Xn.size*scale],od)
 709
 710                                 //Check for Xn
 711                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 712                                 {
 713                                         AnEXTEN |= ((*tok & 7) << 12);
 714                                         AnEXTEN |= EXT_A;
 715                                         tok++;
 716                                 }
 717                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 718                                 {
 719                                         AnEXTEN |= ((*tok & 7) << 12);
 720                                         AnEXTEN |= EXT_D;
 721                                         tok++;
 722                                 }
 723
 724                                 // Check for size
 725                                 {
 726                                         // ([bd,An/PC],Xn.W/L...)
 727                                         switch ((int)*tok)
 728                                         {
 729                                         // Index reg size: <empty> | .W | .L
 730                                         case DOTW:
 731                                                 tok++;
 732                                                 break;
 733                                         default:
 734                                                 break;
 735                                         case DOTL:
 736                                                 tok++;
 737                                                 AnEXTEN |= EXT_L;
 738                                                 break;
 739                                         case DOTB:
 740                                                 // .B not allowed here...
 741                                                 goto badmode;
 742                                         }
 743                                 }
 744
 745                                 // Check for scale
 746                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 747                                 {                           // scale: *1, *2, *4, *8
 748                                         tok++;
 749
 750                                         if (*tok == SYMBOL)
 751                                         {
 752                                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 753                                                         return error("scale factor expression must evaluate");
 754                                                 switch (AnEXVAL)
 755                                                 {
 756                                                 case 1:
 757                                                         break;
 758                                                 case 2:
 759                                                         AnIXSIZ |= TIMES2;
 760                                                         break;
 761                                                 case 4:
 762                                                         AnIXSIZ |= TIMES4;
 763                                                         break;
 764                                                 case 8:
 765                                                         AnIXSIZ |= TIMES8;
 766                                                         break;
 767                                                 default:
 768                                                         goto badmode;
 769                                                 }
 770                                         }
 771                                         else if (*tok++ != CONST || *tok > 8)
 772                                                 goto badmode;
 773                                         else
 774                                         {
 775                                                 switch ((int)*tok++)
 776                                                 {
 777                                                 case 1:
 778                                                         break;
 779                                                 case 2:
 780                                                         AnIXSIZ |= TIMES2;
 781                                                         break;
 782                                                 case 4:
 783                                                         AnIXSIZ |= TIMES4;
 784                                                         break;
 785                                                 case 8:
 786                                                         AnIXSIZ |= TIMES8;
 787                                                         break;
 788                                                 default:
 789                                                         goto badmode;
 790                                                 }
 791                                         }
 792                                 }
 793
 794                                 //Check for ]
 795                                 if (*tok != ']')
 796                                         return error("Expected closing bracket ]");
 797                                 tok++;                  // Eat the bracket
 798
 799                                 //Check for od
 800                                 if (*tok == ')')        // ([bd,An/PC,Xn]...
 801                                 {
 802                                         //od is non existant, get out of jail free card
 803                                         //AnEXVAL=0;            // zero outer displacement
 804                                         AMn = MEMPRE;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
 805                                         AnEXTEN |= EXT_IISPREN; // No outer displacement
 806                                         tok++;
 807                                         goto AnOK;
 808                                 }
 809                                 else if (*tok++!=',')
 810                                         return error("comma expected after ]");
 811
 812                                 WARNING(Put symbol and constant checks here!)
 813
 814                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 815                                         goto badmode;
 816
 817                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 818                                 {
 819                                         // od=0 so optimise it out
 820                                         AMn = MEMPRE;            // let's say it's ([bd,An],Xn,od) with od=0 then
 821                                         AnEXTEN |= EXT_IISPRE0; // No outer displacement
 822                                         tok++;
 823                                         goto AnOK;
 824                                 }
 825
 826                                 // ([bd,An/PC,Xn],od)
 827                                 if (*tok == DOTL)
 828                                 {
 829                                         // expr.L
 830                                         AMn = MEMPRE;
 831                                         tok++;
 832                                         AnEXTEN |= EXT_IISPREL;
 833                                 }
 834                                 else
 835                                 {
 836                                         // expr.[W]
 837                                         //tok++;
 838
 839                                         AnEXTEN |= EXT_IISPREW;
 840                                         AMn = MEMPRE;
 841
 842                     // Is .W forced here?
 843                                         if (*tok == DOTW)
 844                                         {
 845                                                 tok++;
 846                                         }
 847
 848                                         // Defined, absolute values from $FFFF8000..$00007FFF get optimized
 849                                         // to absolute short
 850                                         else if (CHECK_OPTS(OPT_BASE_DISP)
 851                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 852                                                 && ((AnEXVAL + 0x8000) < 0x10000))
 853                                         {
 854                                                 AnEXTEN |= EXT_IISPREW;
 855                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 856                                         }
 857                                 }
 858
 859                                 // Check for final closing parenthesis
 860                                 if (*tok == ')')
 861                                 {
 862                                         tok++;
 863                                         goto AnOK;
 864                                 }
 865                                 else
 866                                         return error("Closing parenthesis missing on addressing mode");
 867                         }
 868                         else
 869                                 goto badmode;
 870                 }
 871                 else
 872                 {
 873                         // (expr...
 874                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 875                                 return ERROR;
 876
 877                         // It could be that this is really just an expression prefixing a
 878                         // register as a displacement...
 879                         if (*tok == ')')
 880                         {
 881                                 tok++;
 882                                 goto CHK_FOR_DISPn;
 883                         }
 884
 885                         // Otherwise, check for PC & etc displacements...
 886                         if (*tok++ != ',')
 887                                 goto badmode;
 888
 889                         if ((*tok >= KW_A0) && (*tok <= KW_A7))
 890                         {
 891                                 AnREG = *tok & 7;
 892                                 tok++;
 893
 894                                 if (*tok == ',')
 895                                 {
 896                                         AMn = AINDEXED;
 897                                         goto AMn_IXN;
 898                                 }
 899                                 else if (*tok == ')')
 900                                 {
 901                                         AMn = ADISP;
 902                                         tok++;
 903                                         goto AnOK;
 904                                 }
 905                                 else
 906                                         goto badmode;
 907                         }
 908                         else if (*tok == KW_PC)
 909                         {
 910                                 if (*++tok == ',')
 911                                 {                             // expr(PC,Xn...)
 912                                         AMn = PCINDEXED;
 913                                         goto AMn_IXN;
 914                                 }
 915                                 else if (*tok == ')')
 916                                 {
 917                                         AMn = PCDISP;             // expr(PC)
 918                                         tok++;
 919                                         goto AnOK;
 920                                 }
 921                                 else
 922                                         goto badmode;
 923                         }
 924                         else
 925                                 goto badmode;
 926                 }
 927         }
 928         else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
 929         {
 930                 AMn = APREDEC;
 931                 AnREG = tok[2] & 7;
 932                 tok += 4;
 933         }
 934         else if (*tok == KW_CCR)
 935         {
 936                 AMn = AM_CCR;
 937                 tok++;
 938                 goto AnOK;
 939         }
 940         else if (*tok == KW_SR)
 941         {
 942                 AMn = AM_SR;
 943                 tok++;
 944                 goto AnOK;
 945         }
 946         else if (*tok == KW_USP)
 947         {
 948                 AMn = AM_USP;
 949                 tok++;
 950                 AnREG = 2;      //Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
 951                 goto AnOK;
 952         }
 953         else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
 954         {
 955                 AMn = CACHES;
 956                 AnREG = *tok++ - KW_IC40;
 957
 958                 // After a cache keyword only a comma or EOL is allowed
 959                 if ((*tok != ',') && (*tok != EOL))
 960                         return ERROR;
 961                 goto AnOK;
 962         }
 963         else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
 964         {
 965                 AMn = CREG;
 966                 AnREG = (*tok++) - KW_SFC;
 967                 goto AnOK;
 968         }
 969         else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
 970         {
 971                 AMn = FREG;
 972                 AnREG = (*tok++ & 7);
 973         }
 974         else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
 975         {
 976                 AMn = FPSCR;
 977                 AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
 978         }
 979         // expr
 980         // expr.w
 981         // expr.l
 982         // d16(An)
 983         // d8(An,Xn[.siz])
 984         // d16(PC)
 985         // d8(PC,Xn[.siz])
 986         else
 987         {
 988                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 989                         return ERROR;
 990
 991 CHK_FOR_DISPn:
 992                 if (*tok == DOTW)
 993                 {
 994                         // expr.W
 995                         tok++;
 996                         AMn = ABSW;
 997
 998                         if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
 999                                 AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
1000
1001                         goto AnOK;
1002                 }
1003                 else if (*tok != '(')
1004                 {
1005                         // expr[.L]
1006                         AMn = ABSL;
1007
1008                         // Defined, absolute values from $FFFF8000..$00007FFF get optimized
1009                         // to absolute short
1010                         if (CHECK_OPTS(OPT_ABS_SHORT)
1011                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
1012                                 && ((AnEXVAL + 0x8000) < 0x10000))
1013                         {
1014                                 AMn = ABSW;
1015
1016                                 if (sbra_flag)
1017                                         warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
1018                         }
1019
1020                         // Is .L forced here?
1021                         if (*tok == DOTL)
1022                         {
1023                                 tok++;
1024                                 AMn = ABSL;
1025                         }
1026
1027                         goto AnOK;
1028                 }
1029
1030                 tok++;
1031
1032                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
1033                 {
1034                         AnREG = *tok++ & 7;
1035
1036                         if (*tok == ')')
1037                         {
1038                                 AMn = ADISP;
1039                                 tok++;
1040                                 goto AnOK;
1041                         }
1042
1043                         AMn = AINDEXED;
1044                         goto AMn_IXN;
1045                 }
1046                 else if (*tok == KW_PC)
1047                 {
1048                         if (*++tok == ')')
1049                         {
1050                                 AMn = PCDISP;
1051                                 tok++;
1052                                 goto AnOK;
1053                         }
1054
1055                         AMn = PCINDEXED;
1056                         goto AMn_IXN;
1057                 }
1058
1059                 goto badmode;
1060         }
1061
1062         // Addressing mode OK
1063 AnOK:
1064         ;
1065 }
1066
1067 // Clean up dirty little macros
1068 #undef AnOK
1069 #undef AMn
1070 #undef AnREG
1071 #undef AnIXREG
1072 #undef AnIXSIZ
1073 #undef AnEXPR
1074 #undef AnEXVAL
1075 #undef AnEXATTR
1076 #undef AnOEXPR
1077 #undef AnOEXVAL
1078 #undef AnOEXATTR
1079 #undef AnESYM
1080 #undef AMn_IX0
1081 #undef AMn_IXN
1082 #undef CHK_FOR_DISPn
1083 #undef AnBEXPR
1084 #undef AnBEXVAL
1085 #undef AnBEXATTR
1086 #undef AnBZISE
1087 #undef AnEXTEN
1088 #undef AMn_030
1089 #undef IS_SUPPRESSEDn
1090 #undef CHECKODn