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, 2011-2020 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         uint64_t scaleval;                      // Expression's value
  13         TOKEN scaleexpr[EXPRSIZE];      // Expression
  14         WORD scaleattr;                         // Expression's attribute
  15         SYM * scaleesym;                        // External symbol involved in expr
  16
  17         // Dn
  18         // An
  19         // # expression
  20         if ((*tok >= KW_D0) && (*tok <= KW_D7))
  21         {
  22                 AMn = DREG;
  23                 AnREG = *tok++ & 7;
  24         }
  25         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
  26         {
  27                 AMn = AREG;
  28                 AnREG = *tok++ & 7;
  29         }
  30         else if (*tok == '#')
  31         {
  32                 tok++;
  33
  34                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
  35                         return ERROR;
  36
  37                 AMn = IMMED;
  38         }
  39
  40         // Small problem with this is that the opening parentheses might be an
  41         // expression that's part of a displacement; this code will falsely flag
  42         // that as an error.
  43
  44         // (An)
  45         // (An)+
  46         // (An,Xn[.siz][*scale])
  47         // (PC,Xn[.siz][*scale])
  48         // (d16,An)
  49         // (d8,An,Xn[.siz][*scale])
  50         // (d16,PC)
  51         // (d8,PC,Xn[.siz][*scale])
  52         // ([bd,An],Xn[.siz][*scale],od)
  53         // ([bd,An,Xn[.siz][*scale]],od)
  54         // ([bd,PC],Xn[.siz][*scale],od)
  55         // ([bd,PC,Xn[.siz][*scale]],od)
  56         else if (*tok == '(')
  57         {
  58                 tok++;
  59
  60                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
  61                 {
  62                         AnREG = *tok++ & 7;
  63
  64                         if (*tok == ')')
  65                         {
  66                                 tok++;
  67
  68                                 if (*tok == '+')
  69                                 {
  70                                         tok++;
  71                                         AMn = APOSTINC;
  72                                 }
  73                                 else
  74                                         AMn = AIND;
  75
  76                                 goto AnOK;
  77                         }
  78
  79                         AMn = AINDEXED;
  80                         goto AMn_IX0;            // Handle ",Xn[.siz][*scale])"
  81                 }
  82                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
  83                 {
  84                         // Since index register isn't used here, store register number in this field
  85                         AnIXREG = *tok++ & 7;                                // (Dn)
  86
  87                         if (*tok == ')')
  88                         {
  89                                 tok++;
  90                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
  91                                 AnEXTEN |= EXT_BS;          // Base register suppressed
  92                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
  93                                 AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
  94                                 AMn = MEMPOST;
  95                                 AnREG = 6 << 3;         // stuff 110 to mode field
  96                                 goto AnOK;
  97                         }
  98                         else if (*tok == 'L')
  99                         {
 100                                 AMn = DINDL;                                                                     // (Dn.l)
 101                                 AnEXTEN = 1 << 11;   // Long index size
 102                                 tok++;
 103                         }
 104                         else if (*tok == 'W')                                // (Dn.w)
 105                         {
 106                                 AMn = DINDW;
 107                                 AnEXTEN = 0 << 11;   // Word index size
 108                                 tok++;
 109                         }
 110                         else if (*tok == ',')
 111                         {
 112                                 // ([bd,An],Xn..) without bd, An
 113                                 // Base displacement is suppressed
 114                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
 115                                 AnEXTEN |= EXT_BS;          // Base register suppressed
 116                                 AnEXTEN |= EXT_BDSIZE0;
 117                                 AnREG = 6 << 3;         // stuff 110 to mode field
 118                                 tok++;
 119                                 goto CHECKODn;
 120                         }
 121                         else
 122                         {
 123                                 return error("(Dn) error");
 124                         }
 125
 126                         if (*tok == '*')
 127                         {                        // scale: *1, *2, *4, *8
 128                                 tok++;
 129
 130                                 if (*tok == SYMBOL)
 131                                 {
 132                                         if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 133                                                 return error("scale factor expression must evaluate");
 134
 135                                         switch (scaleval)
 136                                         {
 137                                         case 1:
 138                                                 break;
 139                                         case 2:
 140                                                 AnIXSIZ |= TIMES2;
 141                                                 AnEXTEN |= 1 << 9;
 142                                                 break;
 143                                         case 4:
 144                                                 AnIXSIZ |= TIMES4;
 145                                                 AnEXTEN |= 2 << 9;
 146                                                 break;
 147                                         case 8:
 148                                                 AnIXSIZ |= TIMES8;
 149                                                 AnEXTEN |= 3 << 9;
 150                                                 break;
 151                                         default:
 152                                                 goto badmode;
 153                                         }
 154                                 }
 155                                 else if (*tok++ != CONST)
 156                                         goto badmode;
 157                                 else
 158                                 {
 159                                         switch ((int)*tok++)
 160                                         {
 161                                         case 1:
 162                                                 break;
 163                                         case 2:
 164                                                 AnIXSIZ |= TIMES2;
 165                                                 AnEXTEN |= 1 << 9;
 166                                                 break;
 167                                         case 4:
 168                                                 AnIXSIZ |= TIMES4;
 169                                                 AnEXTEN |= 2 << 9;
 170                                                 break;
 171                                         case 8:
 172                                                 AnIXSIZ |= TIMES8;
 173                                                 AnEXTEN |= 3 << 9;
 174                                                 break;
 175                                         default:
 176                                                 goto badmode;
 177                                         }
 178
 179                                         tok++;  // Take into account that constants are 64-bit
 180                                 }
 181                         }
 182
 183                         if (*tok == ')')
 184                         {
 185                                 tok++;
 186                                 AnEXTEN |= EXT_FULLWORD;    // Definitely using full extension format, so set bit 8
 187                                 AnEXTEN |= EXT_BS;          // Base register suppressed
 188                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null
 189                                 AnEXTEN |= EXT_IISPOSN;     // Indirect Postindexed with Null Outer Displacement
 190                                 AnREG = 6 << 3;         // stuff 110 to mode field
 191                                 AMn = MEMPOST;
 192                                 goto AnOK;
 193                         }
 194                         else if (*tok == ',')
 195                         {
 196                                 tok++;  // eat the comma
 197                                 // It might be (Dn[.wl][*scale],od)
 198                                 // Maybe this is wrong and we have to write some code here
 199                                 // instead of reusing that path...
 200                                 AnEXTEN |= EXT_FULLWORD;        // Definitely using full extension format, so set bit 8
 201                                 AnEXTEN |= EXT_BS;       // Base displacement null - suppressed
 202                                 AnEXTEN |= AnIXREG << 12;
 203                                 goto CHECKODn;
 204                         }
 205                         else
 206                                 return error("unhandled so far");
 207                 }
 208                 else if (*tok == KW_PC)
 209                 {                            // (PC,Xn[.siz][*scale])
 210                         tok++;
 211                         AMn = PCINDEXED;
 212
 213                         // Common index handler; enter here with 'tok' pointing at the
 214                         // comma.
 215
 216 AMn_IX0:                 // Handle indexed with missing expr
 217
 218                         AnEXVAL = 0;
 219                         AnEXATTR = ABS | DEFINED;
 220
 221 AMn_IXN:                 // Handle any indexed (tok -> a comma)
 222
 223                         if (*tok++ != ',')
 224                                 goto badmode;
 225
 226                         if (*tok < KW_D0 || *tok > KW_A7)
 227                                 goto badmode;
 228
 229                         AnIXREG = *tok++ & 15;
 230
 231                         switch ((int)*tok)
 232                         {                        // Index reg size: <empty> | .W | .L
 233                         case DOTW:
 234                                 tok++;
 235                         default:
 236                                 AnIXSIZ = 0;
 237                                 break;
 238                         case DOTL:
 239                                 AnIXSIZ = 0x0800;
 240                                 tok++;
 241                                 break;
 242                         case DOTB:               // .B not allowed here...
 243                                 goto badmode;
 244                         }
 245
 246                         if (*tok == '*')
 247                         {                        // scale: *1, *2, *4, *8
 248                                 tok++;
 249
 250                                 if (*tok == SYMBOL)
 251                                 {
 252                                         if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 253                                                 return error("scale factor expression must evaluate");
 254
 255                                         switch (scaleval)
 256                                         {
 257                                         case 1:
 258                                                 break;
 259                                         case 2:
 260                                                 AnIXSIZ |= TIMES2;
 261                                                 break;
 262                                         case 4:
 263                                                 AnIXSIZ |= TIMES4;
 264                                                 break;
 265                                         case 8:
 266                                                 AnIXSIZ |= TIMES8;
 267                                                 break;
 268                                         default:
 269                                                 goto badmode;
 270                                         }
 271                                 }
 272                                 else if (*tok++ != CONST)
 273                                         goto badmode;
 274                                 else
 275                                 {
 276                                         switch ((int)*tok++)
 277                                         {
 278                                         case 1:
 279                                                 break;
 280                                         case 2:
 281                                                 AnIXSIZ |= TIMES2;
 282                                                 break;
 283                                         case 4:
 284                                                 AnIXSIZ |= TIMES4;
 285                                                 break;
 286                                         case 8:
 287                                                 AnIXSIZ |= TIMES8;
 288                                                 break;
 289                                         default:
 290                                                 goto badmode;
 291                                         }
 292
 293                                         tok++;  // Take into account that constants are 64-bit
 294                                 }
 295                         }
 296
 297                         if (*tok == ',')
 298                         {
 299                                 // If we got here we didn't get any [] stuff
 300                                 // so let's suppress base displacement before
 301                                 // branching off
 302                                 tok++;
 303                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null - suppressed
 304                                 goto CHECKODn;
 305                         }
 306                         if (*tok++ != ')')         // final ")"
 307                                 goto badmode;
 308
 309                         goto AnOK;
 310                 }
 311                 else if (*tok == '[')
 312                 {                              // ([...
 313                         tok++;
 314                         AnEXTEN |= EXT_FULLWORD;     // Definitely using full extension format, so set bit 8
 315
 316                         // Check to see if base displacement is present
 317                         if (*tok != CONST && *tok != SYMBOL)
 318                         {
 319                                 AnEXTEN |= EXT_BDSIZE0;
 320                         }
 321                         else
 322                         {
 323                                 expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
 324
 325                                 if (CHECK_OPTS(OPT_020_DISP) && (AnBEXVAL == 0) && (AnEXATTR != 0))
 326                                 {
 327                                         // bd = 0 so let's optimise it out
 328                                         AnEXTEN |= EXT_BDSIZE0;
 329                                 }
 330                                 else if (*tok == DOTL)
 331                                 {
 332                                         // ([bd.l,...
 333                                         AnEXTEN |= EXT_BDSIZEL;
 334                                         tok++;
 335                                 }
 336                                 else
 337                                 {
 338                                         // ([bd[.w],... or ([bd,...
 339                                         // Is .W forced here?
 340                                         if (*tok == DOTW)
 341                                         {
 342                                                 AnEXTEN |= EXT_BDSIZEW;
 343                                                 tok++;
 344                                         }
 345                                         else
 346                                         {
 347                                                 // Defined, absolute values from $FFFF8000..$00007FFF
 348                                                 // get optimized to absolute short
 349                                                 if (CHECK_OPTS(OPT_020_DISP)
 350                                                         && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
 351                                                         && (((uint32_t)AnBEXVAL + 0x8000) < 0x10000))
 352                                                 {
 353                                                         AnEXTEN |= EXT_BDSIZEW;
 354
 355                                                         if (optim_warn_flag)
 356                                                                 warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
 357                                                 }
 358                                                 else
 359                                                 {
 360                                                         AnEXTEN |= EXT_BDSIZEL;
 361                                                 }
 362                                         }
 363                                 }
 364
 365                                 if (*tok == ',')
 366                                         tok++;
 367                                 //else
 368                                 //      return error("Comma expected after base displacement");
 369                         }
 370
 371                         // Check for address register or PC, suppress base register
 372                         // otherwise
 373
 374                         if (*tok == KW_PC)
 375                         {                                       // ([bd,PC,...
 376                                 AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
 377                                 tok++;
 378                         }
 379                         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
 380                         {                                       // ([bd,An,...
 381                                 AnREG = (6 << 3) | (*tok & 7);
 382                                 tok++;
 383                         }
 384                         else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 385                         {
 386                                 // ([bd,Dn,...
 387                                 AnREG = (6 << 3);
 388                                 AnEXTEN |= ((*tok & 7) << 12);
 389                                 AnEXTEN |= EXT_D;
 390                                 AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
 391                                 tok++;
 392
 393                                 // Check for size
 394                                 // ([bd,An/PC],Xn.W/L...)
 395                                 switch ((int)*tok)
 396                                 {
 397                                 // Index reg size: <empty> | .W | .L
 398                                 case DOTW:
 399                                         tok++;
 400                                         break;
 401                                 default:
 402                                         break;
 403                                 case DOTL:
 404                                         AnEXTEN |= EXT_L;
 405                                         tok++;
 406                                         break;
 407                                 case DOTB:
 408                                         // .B not allowed here...
 409                                         goto badmode;
 410                                 }
 411
 412                                 // Check for scale
 413                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 414                                 {                           // scale: *1, *2, *4, *8
 415                                         tok++;
 416
 417                                         if (*tok == SYMBOL)
 418                                         {
 419                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 420                                                         return error("scale factor expression must evaluate");
 421
 422                                                 switch (scaleval)
 423                                                 {
 424                                                 case 1:
 425                                                         break;
 426                                                 case 2:
 427                                                         AnIXSIZ |= TIMES2;
 428                                                         break;
 429                                                 case 4:
 430                                                         AnIXSIZ |= TIMES4;
 431                                                         break;
 432                                                 case 8:
 433                                                         AnIXSIZ |= TIMES8;
 434                                                         break;
 435                                                 default:
 436                                                         goto badmode;
 437                                 }
 438                                         }
 439                                         else if (*tok++ != CONST)
 440                                                 goto badmode;
 441                                         else
 442                                         {
 443                                                 switch ((int)*tok++)
 444                                                 {
 445                                                 case 1:
 446                                                         break;
 447                                                 case 2:
 448                                                         AnIXSIZ |= TIMES2;
 449                                                         break;
 450                                                 case 4:
 451                                                         AnIXSIZ |= TIMES4;
 452                                                         break;
 453                                                 case 8:
 454                                                         AnIXSIZ |= TIMES8;
 455                                                         break;
 456                                                 default:
 457                                                         goto badmode;
 458                                                 }
 459
 460                                                 tok++;  // Take into account that constants are 64-bit
 461                                         }
 462                                 }
 463                                 if (*tok == ']')  // ([bd,Dn]...
 464                                 {
 465                                         tok++;
 466                                         goto IS_SUPPRESSEDn;
 467                                 }
 468                         }
 469                         else if (*tok == ']')
 470                         {
 471                                 // PC and Xn is suppressed
 472                                 AnREG = 6 << 3;         // stuff 110b to mode field
 473                                 AnEXTEN |= EXT_BS;
 474                         }
 475                         else
 476                         {
 477                                 goto badmode;
 478                         }
 479
 480                         // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
 481                         if (*tok == ']')
 482                         {
 483                                 // ([bd,An/PC],Xn,od)
 484                                 // Check for Xn
 485                                 tok++;
 486
 487                                 if (*tok == ')')
 488                                 {
 489                                         // Xn and od are non existent, get out of jail free card
 490                                         tok++;
 491                                         AMn = MEMPRE;                   // ([bc,An,Xn],od) with no Xn and od
 492                                         AnEXTEN |= EXT_IS | EXT_IISPREN;        // Suppress Xn and od
 493                                         goto AnOK;
 494                                 }
 495                                 else if (*tok != ',')
 496                                         return error("comma expected after ]");
 497                                 else
 498                                         tok++;                          // eat the comma
 499
 500                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 501                                 {
 502                                         AnIXREG = ((*tok & 7) << 12);
 503                                         AnEXTEN |= EXT_A;
 504                                         tok++;
 505                                 }
 506                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 507                                 {
 508                                         AnEXTEN |= ((*tok & 7) << 12);
 509                                         AnEXTEN |= EXT_D;
 510                                         tok++;
 511                                 }
 512                                 else
 513                                 {
 514                                         // No index found, suppress it
 515                                         AnEXTEN |= EXT_IS;
 516                                         tok--;                                  // Rewind tok to point to the comma
 517                                         goto IS_SUPPRESSEDn;    // https://xkcd.com/292/ - what does he know anyway?
 518                                 }
 519
 520                                 // Check for size
 521                                 // ([bd,An/PC],Xn.W/L...)
 522                                 switch ((int)*tok)
 523                                 {
 524                                 // Index reg size: <empty> | .W | .L
 525                                 case DOTW:
 526                                         tok++;
 527                                         break;
 528                                 default:
 529                                         break;
 530                                 case DOTL:
 531                                         AnEXTEN |= EXT_L;
 532                                         tok++;
 533                                         break;
 534                                 case DOTB:
 535                                         // .B not allowed here...
 536                                         goto badmode;
 537                                 }
 538
 539                                 // Check for scale
 540                                 if (*tok == '*')                   // ([bd,An/PC],Xn*...)
 541                                 {                                  // scale: *1, *2, *4, *8
 542                                         tok++;
 543
 544                                         if (*tok == SYMBOL)
 545                                         {
 546                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 547                                                         return error("scale factor expression must evaluate");
 548
 549                                                 switch (scaleval)
 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                                         else if (*tok++ != CONST)
 567                                                 goto badmode;
 568                                         else
 569                                         {
 570                                                 switch ((int)*tok++)
 571                                                 {
 572                                                 case 1:
 573                                                         break;
 574                                                 case 2:
 575                                                         AnIXSIZ |= TIMES2;
 576                                                         break;
 577                                                 case 4:
 578                                                         AnIXSIZ |= TIMES4;
 579                                                         break;
 580                                                 case 8:
 581                                                         AnIXSIZ |= TIMES8;
 582                                                         break;
 583                                                 default:
 584                                                         goto badmode;
 585                                                 }
 586
 587                                                 tok++;  // Take into account that constants are 64-bit
 588                                         }
 589                                 }
 590
 591                                 // Check for od
 592                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 593                                 {
 594                                         // od is non existent, get out of jail free card
 595                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 596                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 597                                         tok++;
 598                                         goto AnOK;
 599                                 }
 600                                 else if (*tok != ',')
 601                                         return error("comma expected");
 602                                 else
 603                                         tok++;  // eat the comma
 604
 605 CHECKODn:
 606                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 607                                         goto badmode;
 608
 609                                 if (CHECK_OPTS(OPT_020_DISP) && (AnEXATTR & DEFINED) && (AnEXVAL == 0))
 610                                 {
 611                                         // od = 0 so optimise it out
 612                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 613                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 614                                         tok++;
 615                                         goto AnOK;
 616                                 }
 617
 618                                 // ([bd,An/PC],Xn,od)
 619                                         // Is .W forced here?
 620                                 if (*tok == DOTW)
 621                                 {
 622                                         tok++;
 623                                         // od[.W]
 624                                         AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 625                                         AMn = MEMPOST;
 626                                 }
 627                                 else
 628                                 {
 629                                         // Is .L forced here?
 630                                         if (*tok == DOTL)
 631                                                 tok++;                          // Doesn't matter, we're going for .L anyway
 632
 633                                         // od.L
 634                                         if (!(AnEXTEN & EXT_BS))
 635                                                 AnEXTEN |= EXT_IISPOSL; // Long outer displacement
 636                                         else
 637                                         {
 638                                                 // bd is suppressed, so sticking the od size in bd
 639                                                 AnEXTEN |= EXT_BDSIZEL;
 640                                                 // And of course the expression has to be copied to
 641                                                 // AnBEXPR instead of AnEXPR. Yay. :-/
 642                                                 int i = 0;
 643
 644                                                 do
 645                                                 {
 646                                                         AnBEXPR[i] = AnEXPR[i];
 647                                                         i++;
 648                                                 } while (AnEXPR[i] != 'E');
 649
 650                                                 AnBEXPR[i] = 'E';
 651                                         }
 652
 653                                         AMn = MEMPOST;
 654
 655                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 656                                         // optimized to absolute short
 657                                         if (CHECK_OPTS(OPT_020_DISP)
 658                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 659                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 660                                         {
 661                                                 AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 662                                                 AMn = MEMPOST;
 663                                                 if (optim_warn_flag)
 664                                                         warn("absolute value in outer displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
 665                                         }
 666                                 }
 667
 668                                 // Check for final closing parenthesis
 669                                 if (*tok == ')')
 670                                 {
 671                                         tok++;
 672                                         goto AnOK;
 673                                 }
 674                                 else
 675                                         return error("Closing parenthesis missing on addressing mode");
 676
 677 IS_SUPPRESSEDn:
 678
 679                                 // Check for od
 680                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 681                                 {
 682                                         // od is non existent, get out of jail free card
 683                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 684                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 685                                         tok++;
 686                                         goto AnOK;
 687                                 }
 688                                 else if (*tok!=',')
 689                                         return error("comma expected");
 690                                 else
 691                                         tok++;  // eat the comma
 692
 693                                 if ((*tok != CONST) && (*tok != SYMBOL))
 694                                         goto badmode;
 695
 696                                 expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
 697
 698                                 if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0))
 699                                 {
 700                                         // od=0 so optimise it out
 701                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 702                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 703                                         tok++;
 704                                         goto AnOK;
 705                                 }
 706
 707                                 // ([bd,An/PC],Xn,od)
 708                                 if (*tok == DOTL)
 709                                 {
 710                                         // expr.L
 711                                         tok++;
 712                                         AMn = MEMPOST;
 713                                         AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
 714                                 }
 715                                 else
 716                                 {
 717                                         // expr[.W][]
 718                                         AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
 719                                         AMn = MEMPRE;
 720
 721                                         if (*tok == DOTW)
 722                                         {
 723                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
 724                                                 AMn = MEMPOST;
 725                                                 tok++;
 726                                         }
 727                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 728                                         // optimized to absolute short
 729                                         else if (CHECK_OPTS(OPT_020_DISP)
 730                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 731                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 732                                         {
 733                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
 734                                                 if (optim_warn_flag)
 735                                                         warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 736                                         }
 737                                 }
 738
 739                                 // Check for final closing parenthesis
 740                                 if (*tok == ')')
 741                                 {
 742                                         tok++;
 743                                         goto AnOK;
 744                                 }
 745                                 else
 746                                         return error("Closing parenthesis missing on addressing mode");
 747                         }
 748                         else if (*tok == ',')
 749                         {
 750                                 tok++;                  // ([bd,An,Xn.size*scale],od)
 751
 752                                 // Check for Xn
 753                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 754                                 {
 755                                         AnEXTEN |= ((*tok & 7) << 12);
 756                                         AnEXTEN |= EXT_A;
 757                                         tok++;
 758                                 }
 759                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 760                                 {
 761                                         AnEXTEN |= ((*tok & 7) << 12);
 762                                         AnEXTEN |= EXT_D;
 763                                         tok++;
 764                                 }
 765
 766                                 // Check for size
 767                                 // ([bd,An/PC],Xn.W/L...)
 768                                 switch ((int)*tok)
 769                                 {
 770                                 // Index reg size: <empty> | .W | .L
 771                                 case DOTW:
 772                                         tok++;
 773                                         break;
 774                                 default:
 775                                         break;
 776                                 case DOTL:
 777                                         tok++;
 778                                         AnEXTEN |= EXT_L;
 779                                         break;
 780                                 case DOTB:
 781                                 // .B not allowed here...
 782                                 goto badmode;
 783                                 }
 784
 785                                 // Check for scale
 786                                 if (*tok == '*')                                // ([bd,An/PC],Xn*...)
 787                                 {                                                               // scale: *1, *2, *4, *8
 788                                         tok++;
 789
 790                                         if (*tok == SYMBOL)
 791                                         {
 792                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 793                                                         return error("scale factor expression must evaluate");
 794
 795                                                 switch (scaleval)
 796                                                 {
 797                                                 case 1:
 798                                                         break;
 799                                                 case 2:
 800                                                         AnIXSIZ |= TIMES2;
 801                                                         break;
 802                                                 case 4:
 803                                                         AnIXSIZ |= TIMES4;
 804                                                         break;
 805                                                 case 8:
 806                                                         AnIXSIZ |= TIMES8;
 807                                                         break;
 808                                                 default:
 809                                                         goto badmode;
 810                                                 }
 811                                         }
 812                                         else if (*tok++ != CONST)
 813                                                 goto badmode;
 814                                         else
 815                                         {
 816                                                 switch ((int)*tok++)
 817                                                 {
 818                                                 case 1:
 819                                                         break;
 820                                                 case 2:
 821                                                         AnIXSIZ |= TIMES2;
 822                                                         AnEXTEN |= 1 << 9;
 823                                                         break;
 824                                                 case 4:
 825                                                         AnIXSIZ |= TIMES4;
 826                                                         AnEXTEN |= 2 << 9;
 827                                                         break;
 828                                                 case 8:
 829                                                         AnIXSIZ |= TIMES8;
 830                                                         AnEXTEN |= 3 << 9;
 831                                                         break;
 832                                                 default:
 833                                                         goto badmode;
 834                                                 }
 835
 836                                                 tok++;  // Take into account that constants are 64-bit
 837                                         }
 838                                 }
 839
 840                                 // Check for ]
 841                                 if (*tok != ']')
 842                                         return error("Expected closing bracket ]");
 843                                 tok++;                  // Eat the bracket
 844
 845                                 // Check for od
 846                                 if (*tok == ')')        // ([bd,An/PC,Xn]...
 847                                 {
 848                                         // od is non existent, get out of jail free card
 849                                         //AnEXVAL=0;            // zero outer displacement
 850                                         AMn = MEMPRE;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
 851                                         AnEXTEN |= EXT_IISPREN; // No outer displacement
 852                                         tok++;
 853                                         goto AnOK;
 854                                 }
 855                                 else if (*tok++ != ',')
 856                                         return error("comma expected after ]");
 857
 858                                 if (*tok == SYMBOL || *tok == CONST)
 859                                 {
 860                                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 861                                                 goto badmode;
 862
 863                                         if (CHECK_OPTS(OPT_020_DISP) && (AnEXVAL == 0) && (AnEXATTR & DEFINED))
 864                                         {
 865                                                 // od=0 so optimise it out
 866                                                 AMn = MEMPRE;            // let's say it's ([bd,An],Xn,od) with od=0 then
 867                                                 AnEXTEN |= EXT_IISPRE0; // No outer displacement
 868                                                 tok++;
 869                                                 goto AnOK;
 870                                         }
 871                                 }
 872
 873                                 // ([bd,An/PC,Xn],od)
 874                                 if (*tok == DOTL)
 875                                 {
 876                                         // expr.L
 877                                         AMn = MEMPRE;
 878                                         tok++;
 879                                         AnEXTEN |= EXT_IISPREL;
 880                                 }
 881                                 else
 882                                 {
 883                                         // expr.[W]
 884                                         AMn = MEMPRE;
 885                                         int expr_size = EXT_IISPREW; // Assume we have a .w value
 886
 887                                         if ((AnEXVAL + 0x8000) > 0x10000)
 888                                         {
 889                                                 // Long value, so mark it as such for now
 890                                                 expr_size = EXT_IISPREL;
 891
 892                                                 // Defined, absolute values from $FFFF8000..$00007FFF
 893                                                 // get optimized to absolute short
 894                                                 if (CHECK_OPTS(OPT_020_DISP)
 895                                                         && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 896                                                         && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 897                                                 {
 898                                                         expr_size = EXT_IISPREW;
 899
 900                                                         if (optim_warn_flag)
 901                                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 902                                                 }
 903                                         }
 904
 905                                         AnEXTEN |= expr_size; // Assume we have a .w value
 906
 907                                         // Is .W forced here?
 908                                         if (*tok == DOTW)
 909                                         {
 910                                                 tok++;
 911
 912                                                 if (expr_size == EXT_IISPREL)
 913                                                         return error("outer displacement value does not fit in .w size");
 914                                         }
 915                                 }
 916
 917                                 // Check for final closing parenthesis
 918                                 if (*tok == ')')
 919                                 {
 920                                         tok++;
 921                                         goto AnOK;
 922                                 }
 923                                 else
 924                                         return error("Closing parenthesis missing on addressing mode");
 925                         }
 926                         else
 927                                 goto badmode;
 928                 }
 929                 else
 930                 {
 931                         // (expr...
 932                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 933                                 return ERROR;
 934
 935                         // It could be that this is really just an expression prefixing a
 936                         // register as a displacement...
 937                         if (*tok == ')')
 938                         {
 939                                 tok++;
 940                                 goto CHK_FOR_DISPn;
 941                         }
 942
 943                         // Otherwise, check for PC & etc displacements...
 944                         if (*tok++ != ',')
 945                                 goto badmode;
 946
 947                         if ((*tok >= KW_A0) && (*tok <= KW_A7))
 948                         {
 949                                 AnREG = *tok & 7;
 950                                 tok++;
 951
 952                                 if (*tok == ',')
 953                                 {
 954                                         // Check if we're actually doing d8(An,Dn) or
 955                                         // (d16,An,Dn[.size][*scale])
 956                                         // TODO: not a very clear cut case from what I can think.
 957                                         // The only way to distinguish between the two is to check
 958                                         // AnEXVAL and see if it's >127 or <-128. But this doesn't
 959                                         // work if AnEXVAL isn't defined yet. For now we fall
 960                                         // through to d8(An,Dn) but this might bite us in the arse
 961                                         // during fixups...
 962                                         if ((AnEXATTR & DEFINED) && (AnEXVAL + 0x80 > 0x100))
 963                                         {
 964                                                 // We're going to treat it as a full extension format
 965                                                 // with no indirect access and no base displacement/
 966                                                 // index register suppression
 967                                                 AnEXTEN |= EXT_FULLWORD;        // Definitely using full extension format, so set bit 8
 968                                                 AnEXTEN |= EXT_IISPRE0;         // No Memory Indirect Action
 969                                                 AnEXTEN |= EXT_BDSIZEL;         // Base Displacement Size Long
 970                                                 tok++;                                          // Get past the comma
 971
 972                                                 // Our expression is techically a base displacement,
 973                                                 // so let's copy it to the relevant variables so
 974                                                 // eagen0.c can pick it up properly
 975                                                 //AnBEXPR = AnEXPR;
 976                                                 AnBEXVAL = AnEXVAL;
 977                                                 AnBEXATTR = AnEXATTR;
 978
 979                                                 if ((*tok >= KW_D0) && (*tok <= KW_D7))
 980                                                 {
 981                                                         AnEXTEN |= ((*tok++) & 7) << 12;
 982                                                         // Check for size
 983                                                         {
 984                                                                 switch ((int)*tok)
 985                                                                 {
 986                                                                 // Index reg size: <empty> | .W | .L
 987                                                                 case DOTW:
 988                                                                         tok++;
 989                                                                         break;
 990                                                                 default:
 991                                                                         break;
 992                                                                 case DOTL:
 993                                                                         tok++;
 994                                                                         AnEXTEN |= EXT_L;
 995                                                                         break;
 996                                                                 case DOTB:
 997                                                                         // .B not allowed here...
 998                                                                         goto badmode;
 999                                                                 }
1000                                                         }
1001                                                         // Check for scale
1002                                                         if (*tok == '*')                // ([bd,An/PC],Xn*...)
1003                                                         {                                               // scale: *1, *2, *4, *8
1004                                                                 tok++;
1005
1006                                                                 if (*tok == SYMBOL)
1007                                                                 {
1008                                                                         if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
1009                                                                                 return error("scale factor expression must evaluate");
1010
1011                                                                         switch (scaleval)
1012                                                                         {
1013                                                                         case 1:
1014                                                                                 break;
1015                                                                         case 2:
1016                                                                                 AnIXSIZ |= TIMES2;
1017                                                                                 break;
1018                                                                         case 4:
1019                                                                                 AnIXSIZ |= TIMES4;
1020                                                                                 break;
1021                                                                         case 8:
1022                                                                                 AnIXSIZ |= TIMES8;
1023                                                                                 break;
1024                                                                         default:
1025                                                                                 goto badmode;
1026                                                                         }
1027                                                                 }
1028                                                                 else if (*tok++ != CONST)
1029                                                                         goto badmode;
1030                                                                 else
1031                                                                 {
1032                                                                         switch ((int)*tok++)
1033                                                                         {
1034                                                                         case 1:
1035                                                                                 break;
1036                                                                         case 2:
1037                                                                                 AnIXSIZ |= TIMES2;
1038                                                                                 break;
1039                                                                         case 4:
1040                                                                                 AnIXSIZ |= TIMES4;
1041                                                                                 break;
1042                                                                         case 8:
1043                                                                                 AnIXSIZ |= TIMES8;
1044                                                                                 break;
1045                                                                         default:
1046                                                                                 goto badmode;
1047                                                                         }
1048
1049                                                                         tok++;  // Take into account that constants are 64-bit
1050                                                                 }
1051                                                         }
1052
1053                                                         if (*tok++ != ')')
1054                                                                 return error("Closing parenthesis missing on addressing mode");
1055
1056                                                         // Let's say that this is the closest to our case
1057                                                         AMn = MEMPOST;
1058                                                         goto AnOK;
1059                                                 }
1060                                                 else
1061                                                         goto badmode;
1062                                         }
1063
1064                                         AMn = AINDEXED;
1065                                         goto AMn_IXN;
1066                                 }
1067                                 else if (*tok == ')')
1068                                 {
1069                                         AMn = ADISP;
1070                                         tok++;
1071                                         goto AnOK;
1072                                 }
1073                                 else
1074                                         goto badmode;
1075                         }
1076                         else if (*tok == KW_PC)
1077                         {
1078                                 if (*++tok == ',')
1079                                 {                             // expr(PC,Xn...)
1080                                         AMn = PCINDEXED;
1081                                         goto AMn_IXN;
1082                                 }
1083                                 else if (*tok == ')')
1084                                 {
1085                                         AMn = PCDISP;             // expr(PC)
1086                                         tok++;
1087                                         goto AnOK;
1088                                 }
1089                                 else
1090                                         goto badmode;
1091                         }
1092                         else
1093                                 goto badmode;
1094                 }
1095         }
1096         else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
1097         {
1098                 AMn = APREDEC;
1099                 AnREG = tok[2] & 7;
1100                 tok += 4;
1101         }
1102         else if (*tok == KW_CCR)
1103         {
1104                 AMn = AM_CCR;
1105                 tok++;
1106                 goto AnOK;
1107         }
1108         else if (*tok == KW_SR)
1109         {
1110                 AMn = AM_SR;
1111                 tok++;
1112                 goto AnOK;
1113         }
1114         else if (*tok == KW_USP)
1115         {
1116                 AMn = AM_USP;
1117                 tok++;
1118                 AnREG = 2;      // Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
1119                 goto AnOK;
1120         }
1121         else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
1122         {
1123                 AMn = CACHES;
1124                 AnREG = *tok++ - KW_IC40;
1125
1126                 // After a cache keyword only a comma or EOL is allowed
1127                 if ((*tok != ',') && (*tok != EOL))
1128                         return ERROR;
1129                 goto AnOK;
1130         }
1131         else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
1132         {
1133                 AMn = CREG;
1134                 AnREG = (*tok++) - KW_SFC;
1135                 goto AnOK;
1136         }
1137         else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
1138         {
1139                 AMn = FREG;
1140                 AnREG = (*tok++ & 7);
1141         }
1142         else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
1143         {
1144                 AMn = FPSCR;
1145                 AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
1146         }
1147         // expr
1148         // expr.w
1149         // expr.l
1150         // d16(An)
1151         // d8(An,Xn[.siz])
1152         // d16(PC)
1153         // d8(PC,Xn[.siz])
1154         else
1155         {
1156                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
1157                         return ERROR;
1158
1159 CHK_FOR_DISPn:
1160                 if (*tok == DOTW)
1161                 {
1162                         // expr.W
1163                         tok++;
1164                         AMn = ABSW;
1165
1166                         if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
1167                                 AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
1168
1169                         goto AnOK;
1170                 }
1171                 else if (*tok != '(')
1172                 {
1173                         // expr[.L]
1174                         AMn = ABSL;
1175
1176                         // When PC relative is enforced, check for any symbols that aren't
1177                         // EQU'd, in this case it's an illegal mode
1178                         if ((CHECK_OPTS(OPT_PC_RELATIVE)) && (AnEXATTR & REFERENCED) && (AnEXATTR & DEFINED) && (!(AnEXATTR & EQUATED)))
1179                                 return error("relocation not allowed");
1180
1181                         // .L is forced here
1182                         if (*tok == DOTL)
1183                         {
1184                                 tok++;
1185                                 AMn = ABSL;
1186                         }
1187                         else
1188                         {
1189                                 // Defined, absolute values from $FFFF8000..$00007FFF get
1190                                 // optimized to absolute short
1191                                 if (CHECK_OPTS(OPT_ABS_SHORT)
1192                                         && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
1193                                         && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
1194                                 {
1195                                         AMn = ABSW;
1196
1197                                         if (optim_warn_flag)
1198                                                 warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
1199                                 }
1200                         }
1201
1202                         goto AnOK;
1203                 }
1204
1205                 tok++;
1206
1207                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
1208                 {
1209                         AnREG = *tok++ & 7;
1210
1211                         if (*tok == ')')
1212                         {
1213                                 AMn = ADISP;
1214                                 tok++;
1215                                 goto AnOK;
1216                         }
1217
1218                         AMn = AINDEXED;
1219                         goto AMn_IXN;
1220                 }
1221                 else if (*tok == KW_PC)
1222                 {
1223                         if (*++tok == ')')
1224                         {
1225                                 AMn = PCDISP;
1226                                 tok++;
1227                                 goto AnOK;
1228                         }
1229
1230                         AMn = PCINDEXED;
1231                         goto AMn_IXN;
1232                 }
1233
1234                 goto badmode;
1235         }
1236
1237         // Addressing mode OK
1238 AnOK:
1239         ;
1240 }
1241
1242 // Clean up dirty little macros
1243 #undef AnOK
1244 #undef AMn
1245 #undef AnREG
1246 #undef AnIXREG
1247 #undef AnIXSIZ
1248 #undef AnEXPR
1249 #undef AnEXVAL
1250 #undef AnEXATTR
1251 #undef AnOEXPR
1252 #undef AnOEXVAL
1253 #undef AnOEXATTR
1254 #undef AnESYM
1255 #undef AMn_IX0
1256 #undef AMn_IXN
1257 #undef CHK_FOR_DISPn
1258 #undef AnBEXPR
1259 #undef AnBEXVAL
1260 #undef AnBEXATTR
1261 #undef AnBZISE
1262 #undef AnEXTEN
1263 #undef AMn_030
1264 #undef IS_SUPPRESSEDn
1265 #undef CHECKODn