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         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_BDSIZE0;     // Base displacement null - suppressed
 201                                 goto CHECKODn;
 202                         }
 203                         else
 204                                 return error("unhandled so far");
 205                 }
 206                 else if (*tok == KW_PC)
 207                 {                            // (PC,Xn[.siz][*scale])
 208                         tok++;
 209                         AMn = PCINDEXED;
 210
 211                         // Common index handler; enter here with 'tok' pointing at the
 212                         // comma.
 213
 214                         AMn_IX0:                 // Handle indexed with missing expr
 215
 216                         AnEXVAL = 0;
 217                         AnEXATTR = ABS | DEFINED;
 218
 219                         AMn_IXN:                 // Handle any indexed (tok -> a comma)
 220
 221                         if (*tok++ != ',')
 222                                 goto badmode;
 223
 224                         if (*tok < KW_D0 || *tok > KW_A7)
 225                                 goto badmode;
 226
 227                         AnIXREG = *tok++ & 15;
 228
 229                         switch ((int)*tok)
 230                         {                        // Index reg size: <empty> | .W | .L
 231                         case DOTW:
 232                                 tok++;
 233                         default:
 234                                 AnIXSIZ = 0;
 235                                 break;
 236                         case DOTL:
 237                                 AnIXSIZ = 0x0800;
 238                                 tok++;
 239                                 break;
 240                         case DOTB:               // .B not allowed here...
 241                                 goto badmode;
 242                         }
 243
 244                         if (*tok == '*')
 245                         {                        // scale: *1, *2, *4, *8
 246                                 tok++;
 247
 248                                 if (*tok == SYMBOL)
 249                                 {
 250                                         if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 251                                                 return error("scale factor expression must evaluate");
 252                                         switch (scaleval)
 253                                         {
 254                                         case 1:
 255                                                 break;
 256                                         case 2:
 257                                                 AnIXSIZ |= TIMES2;
 258                                                 break;
 259                                         case 4:
 260                                                 AnIXSIZ |= TIMES4;
 261                                                 break;
 262                                         case 8:
 263                                                 AnIXSIZ |= TIMES8;
 264                                                 break;
 265                                         default:
 266                                                 goto badmode;
 267                                         }
 268                                 }
 269                                 else if (*tok++ != CONST)
 270                                         goto badmode;
 271                                 else
 272                                 {
 273                                         switch ((int)*tok++)
 274                                         {
 275                                         case 1:
 276                                                 break;
 277                                         case 2:
 278                                                 AnIXSIZ |= TIMES2;
 279                                                 break;
 280                                         case 4:
 281                                                 AnIXSIZ |= TIMES4;
 282                                                 break;
 283                                         case 8:
 284                                                 AnIXSIZ |= TIMES8;
 285                                                 break;
 286                                         default:
 287                                                 goto badmode;
 288                                         }
 289
 290                                         tok++;  // Take into account that constants are 64-bit
 291                                 }
 292                         }
 293
 294                         if (*tok == ',')
 295                         {
 296                                 // If we got here we didn't get any [] stuff
 297                                 // so let's suppress base displacement before
 298                                 // branching off
 299                                 tok++;
 300                                 AnEXTEN |= EXT_BDSIZE0;     // Base displacement null - suppressed
 301                                 goto CHECKODn;
 302                         }
 303                         if (*tok++ != ')')         // final ")"
 304                                 goto badmode;
 305
 306                         goto AnOK;
 307                 }
 308                 else if (*tok == '[')
 309                 {                              // ([...
 310                         tok++;
 311                         AnEXTEN |= EXT_FULLWORD;     // Definitely using full extension format, so set bit 8
 312
 313                         // Check to see if base displacement is present
 314                         if (*tok != CONST && *tok != SYMBOL)
 315                         {
 316                                 AnEXTEN |= EXT_BDSIZE0;
 317                         }
 318                         else
 319                         {
 320                                 expr(AnBEXPR, &AnBEXVAL, &AnBEXATTR, &AnESYM);
 321                                 if (CHECK_OPTS(OPT_BASE_DISP) && AnBEXVAL == 0 && AnEXATTR != 0)
 322                                 {
 323                                         // bd=0 so let's optimise it out
 324                                         AnEXTEN|=EXT_BDSIZE0;
 325                                 }
 326                                 else if (*tok == DOTL)
 327                                 {                                               // ([bd.l,...
 328                                                 AnEXTEN |= EXT_BDSIZEL;
 329                                                 tok++;
 330                                 }
 331                                 else
 332                                 {                                               // ([bd[.w],... or ([bd,...
 333                                         // Is .W forced here?
 334                                         if (*tok == DOTW)
 335                                         {
 336                                                 AnEXTEN |= EXT_BDSIZEW;
 337                                                 tok++;
 338                                         }
 339                                         else
 340                                         {
 341                                                 // Defined, absolute values from $FFFF8000..$00007FFF get optimized
 342                                                 // to absolute short
 343                                                 if (CHECK_OPTS(OPT_ABS_SHORT)
 344                                                         && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
 345                                                         && (((uint32_t)AnBEXVAL + 0x8000) < 0x10000))
 346                                                 {
 347                                                         AnEXTEN |= EXT_BDSIZEW;
 348                                                         warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
 349                                                 }
 350                                                 else
 351                                                 {
 352                                                         AnEXTEN |= EXT_BDSIZEL;
 353                                                 }
 354                                         }
 355                                 }
 356
 357                                 if (*tok == ',')
 358                                         tok++;
 359                                 //else
 360                                 //      return error("Comma expected after base displacement");
 361                         }
 362
 363                         // Check for address register or PC, suppress base register
 364                         // otherwise
 365
 366                         if (*tok == KW_PC)
 367                         {                                       // ([bd,PC,...
 368                                 AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
 369                                 tok++;
 370                         }
 371                         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
 372                         {                                       // ([bd,An,...
 373                                 AnREG = (6 << 3) | *tok & 7;
 374                                 tok++;
 375                         }
 376                         else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 377                         {
 378                                 // ([bd,Dn,...
 379                                 AnREG = (6 << 3);
 380                                 AnEXTEN |= ((*tok & 7) << 12);
 381                                 AnEXTEN |= EXT_D;
 382                                 AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
 383                                 tok++;
 384
 385                                 // Check for size
 386                                 {
 387                                         // ([bd,An/PC],Xn.W/L...)
 388                                         switch ((int)*tok)
 389                                 {
 390                                         // Index reg size: <empty> | .W | .L
 391                                         case DOTW:
 392                                                 tok++;
 393                                                 break;
 394                                         default:
 395                                                 break;
 396                                         case DOTL:
 397                                                 AnEXTEN |= EXT_L;
 398                                                 tok++;
 399                                                 break;
 400                                         case DOTB:
 401                                                 // .B not allowed here...
 402                                                 goto badmode;
 403                                         }
 404                                 }
 405
 406                                 // Check for scale
 407                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 408                                 {                           // scale: *1, *2, *4, *8
 409                                         tok++;
 410
 411                                         if (*tok == SYMBOL)
 412                                         {
 413                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 414                                                         return error("scale factor expression must evaluate");
 415
 416                                                 switch (scaleval)
 417                                                 {
 418                                                 case 1:
 419                                                         break;
 420                                                 case 2:
 421                                                         AnIXSIZ |= TIMES2;
 422                                                         break;
 423                                                 case 4:
 424                                                         AnIXSIZ |= TIMES4;
 425                                                         break;
 426                                                 case 8:
 427                                                         AnIXSIZ |= TIMES8;
 428                                                         break;
 429                                                 default:
 430                                                         goto badmode;
 431                                 }
 432                                         }
 433                                         else if (*tok++ != CONST)
 434                                                 goto badmode;
 435                                         else
 436                                         {
 437                                                 switch ((int)*tok++)
 438                                                 {
 439                                                 case 1:
 440                                                         break;
 441                                                 case 2:
 442                                                         AnIXSIZ |= TIMES2;
 443                                                         break;
 444                                                 case 4:
 445                                                         AnIXSIZ |= TIMES4;
 446                                                         break;
 447                                                 case 8:
 448                                                         AnIXSIZ |= TIMES8;
 449                                                         break;
 450                                                 default:
 451                                                         goto badmode;
 452                                                 }
 453
 454                                                 tok++;  // Take into account that constants are 64-bit
 455                                         }
 456                                 }
 457                                 if (*tok == ']')  // ([bd,Dn]...
 458                                 {
 459                                         tok++;
 460                                         goto IS_SUPPRESSEDn;
 461                                 }
 462                         }
 463                         else if (*tok == ']')
 464                         {
 465                                 // PC and Xn is suppressed
 466                                 AnREG = 6 << 3;         // stuff 110 to mode field
 467                                 //AnEXTEN|=EXT_BS|EXT_IS;
 468                                 AnEXTEN |= EXT_BS;
 469                         }
 470                         else
 471                         {
 472                                 goto badmode;
 473                         }
 474
 475                         // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
 476                         if (*tok == ']')
 477                         {
 478                                 //([bd,An/PC],Xn,od)
 479                                 // Check for Xn
 480                                 tok++;
 481
 482                                 if (*tok == ')')
 483                                 {
 484                                         //Xn and od are non existent, get out of jail free card
 485                                         tok++;
 486                                         AMn = MEMPRE;                   // ([bc,An,Xn],od) with no Xn and od
 487                                         AnEXTEN |= EXT_IS | EXT_IISPREN;        //Suppress Xn and od
 488                                         goto AnOK;
 489                                 }
 490                                 else if (*tok != ',')
 491                                         return error("comma expected after ]");
 492                                 else
 493                                         tok++;                          // eat the comma
 494
 495                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 496                                 {
 497                                         AnIXREG = ((*tok & 7) << 12);
 498                                         AnEXTEN |= EXT_A;
 499                                         tok++;
 500                                 }
 501                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 502                                 {
 503                                         AnEXTEN |= ((*tok & 7) << 12);
 504                                         AnEXTEN |= EXT_D;
 505                                         tok++;
 506                                 }
 507                                 else
 508                                 {
 509                                         //No index found, suppress it
 510                                         AnEXTEN |= EXT_IS;
 511                                         tok--;                                  // Rewind tok to point to the comma
 512                                         goto IS_SUPPRESSEDn;    // https://xkcd.com/292/ - what does he know anyway?
 513                                 }
 514
 515                                 // Check for size
 516                                 {
 517                                         // ([bd,An/PC],Xn.W/L...)
 518                                         switch ((int)*tok)
 519                                         {
 520                                         // Index reg size: <empty> | .W | .L
 521                                         case DOTW:
 522                                                 tok++;
 523                                                 break;
 524                                         default:
 525                                                 break;
 526                                         case DOTL:
 527                                                 AnEXTEN |= EXT_L;
 528                                                 tok++;
 529                                                 break;
 530                                         case DOTB:
 531                                                 // .B not allowed here...
 532                                                 goto badmode;
 533                                         }
 534                                 }
 535
 536                                 // Check for scale
 537                                 if (*tok == '*')                   // ([bd,An/PC],Xn*...)
 538                                 {                                  // scale: *1, *2, *4, *8
 539                                         tok++;
 540
 541                                         if (*tok == SYMBOL)
 542                                         {
 543                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 544                                                         return error("scale factor expression must evaluate");
 545
 546                                                 switch (scaleval)
 547                                                 {
 548                                                 case 1:
 549                                                         break;
 550                                                 case 2:
 551                                                         AnIXSIZ |= TIMES2;
 552                                                         break;
 553                                                 case 4:
 554                                                         AnIXSIZ |= TIMES4;
 555                                                         break;
 556                                                 case 8:
 557                                                         AnIXSIZ |= TIMES8;
 558                                                         break;
 559                                                 default:
 560                                                         goto badmode;
 561                                                 }
 562                                         }
 563                                         else if (*tok++ != CONST)
 564                                                 goto badmode;
 565                                         else
 566                                         {
 567                                                 switch ((int)*tok++)
 568                                                 {
 569                                                 case 1:
 570                                                         break;
 571                                                 case 2:
 572                                                         AnIXSIZ |= TIMES2;
 573                                                         break;
 574                                                 case 4:
 575                                                         AnIXSIZ |= TIMES4;
 576                                                         break;
 577                                                 case 8:
 578                                                         AnIXSIZ |= TIMES8;
 579                                                         break;
 580                                                 default:
 581                                                         goto badmode;
 582                                                 }
 583
 584                                                 tok++;  // Take into account that constants are 64-bit
 585                                         }
 586                                 }
 587
 588                                 // Check for od
 589                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 590                                 {
 591                                         // od is non existent, get out of jail free card
 592                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 593                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 594                                         tok++;
 595                                         goto AnOK;
 596                                 }
 597                                 else if (*tok != ',')
 598                                         return error("comma expected");
 599                                 else
 600                                         tok++;  // eat the comma
 601
 602                                 CHECKODn:
 603                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 604                                         goto badmode;
 605
 606                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 607                                 {
 608                                         // od=0 so optimise it out
 609                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 610                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 611                                         tok++;
 612                                         goto AnOK;
 613                                 }
 614
 615                                 // ([bd,An/PC],Xn,od)
 616                                 if (*tok == DOTL)
 617                                 {
 618                                         // expr.L
 619                                         AnEXTEN |= EXT_IISPOSL; // Long outer displacement
 620                                         AMn = MEMPOST;
 621                                         tok++;
 622
 623                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 624                                         // optimized to absolute short
 625                                         if (CHECK_OPTS(OPT_ABS_SHORT)
 626                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 627                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 628                                         {
 629                                                 AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 630                                                 AMn = MEMPOST;
 631                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 632                                         }
 633
 634                                 }
 635                                 else
 636                                 {
 637                                         // expr[.W]
 638                                         AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 639                                         AMn = MEMPOST;
 640
 641                                         // Is .W forced here?
 642                                         if (*tok == DOTW)
 643                                         {
 644                                                 tok++;
 645                                         }
 646                                 }
 647
 648                                 // Check for final closing parenthesis
 649                                 if (*tok == ')')
 650                                 {
 651                                         tok++;
 652                                         goto AnOK;
 653                                 }
 654                                 else
 655                                         return error("Closing parenthesis missing on addressing mode");
 656
 657 IS_SUPPRESSEDn:
 658
 659                                 // Check for od
 660                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 661                                 {
 662                                         // od is non existent, get out of jail free card
 663                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 664                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 665                                         tok++;
 666                                         goto AnOK;
 667                                 }
 668                                 else if (*tok!=',')
 669                                         return error("comma expected");
 670                                 else
 671                                         tok++;  // eat the comma
 672
 673                                 if ((*tok != CONST) && (*tok != SYMBOL))
 674                                         goto badmode;
 675
 676                                 expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
 677
 678                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 679                                 {
 680                                         // od=0 so optimise it out
 681                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 682                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 683                                         tok++;
 684                                         goto AnOK;
 685                                 }
 686
 687                                 // ([bd,An/PC],Xn,od)
 688                                 if (*tok == DOTL)
 689                                 {
 690                                         // expr.L
 691                                         tok++;
 692                                         AMn = MEMPOST;
 693                                         AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
 694                                 }
 695                                 else
 696                                 {
 697                                         // expr[.W][]
 698                                         AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
 699                                         AMn = MEMPRE;
 700
 701                                         if (*tok == DOTW)
 702                                         {
 703                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
 704                                                 AMn = MEMPOST;
 705                                                 tok++;
 706                                         }
 707                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 708                                         // optimized to absolute short
 709                                         else if (CHECK_OPTS(OPT_BASE_DISP)
 710                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 711                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 712                                         {
 713                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
 714                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 715                                         }
 716                                 }
 717
 718                                 // Check for final closing parenthesis
 719                                 if (*tok == ')')
 720                                 {
 721                                         tok++;
 722                                         goto AnOK;
 723                                 }
 724                                 else
 725                                         return error("Closing parenthesis missing on addressing mode");
 726                         }
 727                         else if (*tok == ',')
 728                         {
 729                                 *tok++;                 // ([bd,An,Xn.size*scale],od)
 730
 731                                 //Check for Xn
 732                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 733                                 {
 734                                         AnEXTEN |= ((*tok & 7) << 12);
 735                                         AnEXTEN |= EXT_A;
 736                                         tok++;
 737                                 }
 738                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 739                                 {
 740                                         AnEXTEN |= ((*tok & 7) << 12);
 741                                         AnEXTEN |= EXT_D;
 742                                         tok++;
 743                                 }
 744
 745                                 // Check for size
 746                                 {
 747                                 // ([bd,An/PC],Xn.W/L...)
 748                                 switch ((int)*tok)
 749                                         {
 750                                         // Index reg size: <empty> | .W | .L
 751                                         case DOTW:
 752                                                 tok++;
 753                                                 break;
 754                                         default:
 755                                                 break;
 756                                         case DOTL:
 757                                                 tok++;
 758                                                 AnEXTEN |= EXT_L;
 759                                                 break;
 760                                         case DOTB:
 761                                         // .B not allowed here...
 762                                         goto badmode;
 763                                         }
 764                                 }
 765
 766                                 // Check for scale
 767                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 768                                 {                           // scale: *1, *2, *4, *8
 769                                         tok++;
 770
 771                                         if (*tok == SYMBOL)
 772                                         {
 773                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 774                                                         return error("scale factor expression must evaluate");
 775                                                 switch (scaleval)
 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                                         else if (*tok++ != CONST)
 793                                                 goto badmode;
 794                                         else
 795                                         {
 796                                                 switch ((int)*tok++)
 797                                                 {
 798                                                 case 1:
 799                                                         break;
 800                                                 case 2:
 801                                                         AnIXSIZ |= TIMES2;
 802                                                         AnEXTEN |= 1 << 9;
 803                                                         break;
 804                                                 case 4:
 805                                                         AnIXSIZ |= TIMES4;
 806                                                         AnEXTEN |= 2 << 9;
 807                                                         break;
 808                                                 case 8:
 809                                                         AnIXSIZ |= TIMES8;
 810                                                         AnEXTEN |= 3 << 9;
 811                                                         break;
 812                                                 default:
 813                                                         goto badmode;
 814                                                 }
 815
 816                                                 tok++;  // Take into account that constants are 64-bit
 817                                         }
 818                                 }
 819
 820                                 // Check for ]
 821                                 if (*tok != ']')
 822                                         return error("Expected closing bracket ]");
 823                                 tok++;                  // Eat the bracket
 824
 825                                 // Check for od
 826                                 if (*tok == ')')        // ([bd,An/PC,Xn]...
 827                                 {
 828                                         // od is non existent, get out of jail free card
 829                                         //AnEXVAL=0;            // zero outer displacement
 830                                         AMn = MEMPRE;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
 831                                         AnEXTEN |= EXT_IISPREN; // No outer displacement
 832                                         tok++;
 833                                         goto AnOK;
 834                                 }
 835                                 else if (*tok++ != ',')
 836                                         return error("comma expected after ]");
 837
 838                                 if (*tok == SYMBOL || *tok == CONST)
 839                                 {
 840                                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 841                                                 goto badmode;
 842
 843                                         if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0) && (AnEXATTR & DEFINED))
 844                                         {
 845                                                 // od=0 so optimise it out
 846                                                 AMn = MEMPRE;            // let's say it's ([bd,An],Xn,od) with od=0 then
 847                                                 AnEXTEN |= EXT_IISPRE0; // No outer displacement
 848                                                 tok++;
 849                                                 goto AnOK;
 850                                         }
 851                                 }
 852
 853                                 // ([bd,An/PC,Xn],od)
 854                                 if (*tok == DOTL)
 855                                 {
 856                                         // expr.L
 857                                         AMn = MEMPRE;
 858                                         tok++;
 859                                         AnEXTEN |= EXT_IISPREL;
 860                                 }
 861                                 else
 862                                 {
 863                                         // expr.[W]
 864                                         AMn = MEMPRE;
 865                                         int expr_size = EXT_IISPREW; // Assume we have a .w value
 866
 867                                         if ((AnEXVAL + 0x8000) > 0x10000)
 868                                         {
 869                                                 // Long value, so mark it as such for now
 870                                                 expr_size = EXT_IISPREL;
 871
 872                                                 // Defined, absolute values from $FFFF8000..$00007FFF
 873                                                 // get optimized to absolute short
 874                                                 if (CHECK_OPTS(OPT_BASE_DISP)
 875                                                         && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 876                                                         && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 877                                                 {
 878                                                         expr_size = EXT_IISPREW;
 879                                                         warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 880                                                 }
 881                                         }
 882
 883                                         AnEXTEN |= expr_size; // Assume we have a .w value
 884
 885                                         // Is .W forced here?
 886                                         if (*tok == DOTW)
 887                                         {
 888                                                 tok++;
 889
 890                                                 if (expr_size == EXT_IISPREL)
 891                                                         return error("outer displacement value does not fit in .w size");
 892                                         }
 893                                 }
 894
 895                                 // Check for final closing parenthesis
 896                                 if (*tok == ')')
 897                                 {
 898                                         tok++;
 899                                         goto AnOK;
 900                                 }
 901                                 else
 902                                         return error("Closing parenthesis missing on addressing mode");
 903                         }
 904                         else
 905                                 goto badmode;
 906                 }
 907                 else
 908                 {
 909                         // (expr...
 910                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 911                                 return ERROR;
 912
 913                         // It could be that this is really just an expression prefixing a
 914                         // register as a displacement...
 915                         if (*tok == ')')
 916                         {
 917                                 tok++;
 918                                 goto CHK_FOR_DISPn;
 919                         }
 920
 921                         // Otherwise, check for PC & etc displacements...
 922                         if (*tok++ != ',')
 923                                 goto badmode;
 924
 925                         if ((*tok >= KW_A0) && (*tok <= KW_A7))
 926                         {
 927                                 AnREG = *tok & 7;
 928                                 tok++;
 929
 930                                 if (*tok == ',')
 931                                 {
 932                                         AMn = AINDEXED;
 933                                         goto AMn_IXN;
 934                                 }
 935                                 else if (*tok == ')')
 936                                 {
 937                                         AMn = ADISP;
 938                                         tok++;
 939                                         goto AnOK;
 940                                 }
 941                                 else
 942                                         goto badmode;
 943                         }
 944                         else if (*tok == KW_PC)
 945                         {
 946                                 if (*++tok == ',')
 947                                 {                             // expr(PC,Xn...)
 948                                         AMn = PCINDEXED;
 949                                         goto AMn_IXN;
 950                                 }
 951                                 else if (*tok == ')')
 952                                 {
 953                                         AMn = PCDISP;             // expr(PC)
 954                                         tok++;
 955                                         goto AnOK;
 956                                 }
 957                                 else
 958                                         goto badmode;
 959                         }
 960                         else
 961                                 goto badmode;
 962                 }
 963         }
 964         else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
 965         {
 966                 AMn = APREDEC;
 967                 AnREG = tok[2] & 7;
 968                 tok += 4;
 969         }
 970         else if (*tok == KW_CCR)
 971         {
 972                 AMn = AM_CCR;
 973                 tok++;
 974                 goto AnOK;
 975         }
 976         else if (*tok == KW_SR)
 977         {
 978                 AMn = AM_SR;
 979                 tok++;
 980                 goto AnOK;
 981         }
 982         else if (*tok == KW_USP)
 983         {
 984                 AMn = AM_USP;
 985                 tok++;
 986                 AnREG = 2;      // Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
 987                 goto AnOK;
 988         }
 989         else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
 990         {
 991                 AMn = CACHES;
 992                 AnREG = *tok++ - KW_IC40;
 993
 994                 // After a cache keyword only a comma or EOL is allowed
 995                 if ((*tok != ',') && (*tok != EOL))
 996                         return ERROR;
 997                 goto AnOK;
 998         }
 999         else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
1000         {
1001                 AMn = CREG;
1002                 AnREG = (*tok++) - KW_SFC;
1003                 goto AnOK;
1004         }
1005         else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
1006         {
1007                 AMn = FREG;
1008                 AnREG = (*tok++ & 7);
1009         }
1010         else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
1011         {
1012                 AMn = FPSCR;
1013                 AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
1014         }
1015         // expr
1016         // expr.w
1017         // expr.l
1018         // d16(An)
1019         // d8(An,Xn[.siz])
1020         // d16(PC)
1021         // d8(PC,Xn[.siz])
1022         else
1023         {
1024                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
1025                         return ERROR;
1026
1027 CHK_FOR_DISPn:
1028                 if (*tok == DOTW)
1029                 {
1030                         // expr.W
1031                         tok++;
1032                         AMn = ABSW;
1033
1034                         if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
1035                                 AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
1036
1037                         goto AnOK;
1038                 }
1039                 else if (*tok != '(')
1040                 {
1041                         // expr[.L]
1042                         AMn = ABSL;
1043
1044                         // Defined, absolute values from $FFFF8000..$00007FFF get optimized
1045                         // to absolute short
1046                         if (CHECK_OPTS(OPT_ABS_SHORT)
1047                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
1048                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
1049                         {
1050                                 AMn = ABSW;
1051
1052                                 if (sbra_flag)
1053                                         warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
1054                         }
1055
1056                         // Is .L forced here?
1057                         if (*tok == DOTL)
1058                         {
1059                                 tok++;
1060                                 AMn = ABSL;
1061                         }
1062
1063                         goto AnOK;
1064                 }
1065
1066                 tok++;
1067
1068                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
1069                 {
1070                         AnREG = *tok++ & 7;
1071
1072                         if (*tok == ')')
1073                         {
1074                                 AMn = ADISP;
1075                                 tok++;
1076                                 goto AnOK;
1077                         }
1078
1079                         AMn = AINDEXED;
1080                         goto AMn_IXN;
1081                 }
1082                 else if (*tok == KW_PC)
1083                 {
1084                         if (*++tok == ')')
1085                         {
1086                                 AMn = PCDISP;
1087                                 tok++;
1088                                 goto AnOK;
1089                         }
1090
1091                         AMn = PCINDEXED;
1092                         goto AMn_IXN;
1093                 }
1094
1095                 goto badmode;
1096         }
1097
1098         // Addressing mode OK
1099 AnOK:
1100         ;
1101 }
1102
1103 // Clean up dirty little macros
1104 #undef AnOK
1105 #undef AMn
1106 #undef AnREG
1107 #undef AnIXREG
1108 #undef AnIXSIZ
1109 #undef AnEXPR
1110 #undef AnEXVAL
1111 #undef AnEXATTR
1112 #undef AnOEXPR
1113 #undef AnOEXVAL
1114 #undef AnOEXATTR
1115 #undef AnESYM
1116 #undef AMn_IX0
1117 #undef AMn_IXN
1118 #undef CHK_FOR_DISPn
1119 #undef AnBEXPR
1120 #undef AnBEXVAL
1121 #undef AnBEXATTR
1122 #undef AnBZISE
1123 #undef AnEXTEN
1124 #undef AMn_030
1125 #undef IS_SUPPRESSEDn
1126 #undef CHECKODn