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, 2011-2018 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_BASE_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_ABS_SHORT)
 350                                                         && ((AnBEXATTR & (TDB | DEFINED)) == DEFINED)
 351                                                         && (((uint32_t)AnBEXVAL + 0x8000) < 0x10000))
 352                                                 {
 353                                                         AnEXTEN |= EXT_BDSIZEW;
 354                                                         warn("absolute value in base displacement ranging $FFFF8000..$00007FFF optimised to absolute short");
 355                                                 }
 356                                                 else
 357                                                 {
 358                                                         AnEXTEN |= EXT_BDSIZEL;
 359                                                 }
 360                                         }
 361                                 }
 362
 363                                 if (*tok == ',')
 364                                         tok++;
 365                                 //else
 366                                 //      return error("Comma expected after base displacement");
 367                         }
 368
 369                         // Check for address register or PC, suppress base register
 370                         // otherwise
 371
 372                         if (*tok == KW_PC)
 373                         {                                       // ([bd,PC,...
 374                                 AnREG = (7 << 3) | 3;   // PC is special case - stuff 011 to register field and 111 to the mode field
 375                                 tok++;
 376                         }
 377                         else if ((*tok >= KW_A0) && (*tok <= KW_A7))
 378                         {                                       // ([bd,An,...
 379                                 AnREG = (6 << 3) | (*tok & 7);
 380                                 tok++;
 381                         }
 382                         else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 383                         {
 384                                 // ([bd,Dn,...
 385                                 AnREG = (6 << 3);
 386                                 AnEXTEN |= ((*tok & 7) << 12);
 387                                 AnEXTEN |= EXT_D;
 388                                 AnEXTEN |= EXT_BS; // Oh look, a data register! Which means that base register is suppressed
 389                                 tok++;
 390
 391                                 // Check for size
 392                                 // ([bd,An/PC],Xn.W/L...)
 393                                 switch ((int)*tok)
 394                                 {
 395                                 // Index reg size: <empty> | .W | .L
 396                                 case DOTW:
 397                                         tok++;
 398                                         break;
 399                                 default:
 400                                         break;
 401                                 case DOTL:
 402                                         AnEXTEN |= EXT_L;
 403                                         tok++;
 404                                         break;
 405                                 case DOTB:
 406                                         // .B not allowed here...
 407                                         goto badmode;
 408                                 }
 409
 410                                 // Check for scale
 411                                 if (*tok == '*')                        // ([bd,An/PC],Xn*...)
 412                                 {                           // scale: *1, *2, *4, *8
 413                                         tok++;
 414
 415                                         if (*tok == SYMBOL)
 416                                         {
 417                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 418                                                         return error("scale factor expression must evaluate");
 419
 420                                                 switch (scaleval)
 421                                                 {
 422                                                 case 1:
 423                                                         break;
 424                                                 case 2:
 425                                                         AnIXSIZ |= TIMES2;
 426                                                         break;
 427                                                 case 4:
 428                                                         AnIXSIZ |= TIMES4;
 429                                                         break;
 430                                                 case 8:
 431                                                         AnIXSIZ |= TIMES8;
 432                                                         break;
 433                                                 default:
 434                                                         goto badmode;
 435                                 }
 436                                         }
 437                                         else if (*tok++ != CONST)
 438                                                 goto badmode;
 439                                         else
 440                                         {
 441                                                 switch ((int)*tok++)
 442                                                 {
 443                                                 case 1:
 444                                                         break;
 445                                                 case 2:
 446                                                         AnIXSIZ |= TIMES2;
 447                                                         break;
 448                                                 case 4:
 449                                                         AnIXSIZ |= TIMES4;
 450                                                         break;
 451                                                 case 8:
 452                                                         AnIXSIZ |= TIMES8;
 453                                                         break;
 454                                                 default:
 455                                                         goto badmode;
 456                                                 }
 457
 458                                                 tok++;  // Take into account that constants are 64-bit
 459                                         }
 460                                 }
 461                                 if (*tok == ']')  // ([bd,Dn]...
 462                                 {
 463                                         tok++;
 464                                         goto IS_SUPPRESSEDn;
 465                                 }
 466                         }
 467                         else if (*tok == ']')
 468                         {
 469                                 // PC and Xn is suppressed
 470                                 AnREG = 6 << 3;         // stuff 110 to mode field
 471                                 //AnEXTEN|=EXT_BS|EXT_IS;
 472                                 AnEXTEN |= EXT_BS;
 473                         }
 474                         else
 475                         {
 476                                 goto badmode;
 477                         }
 478
 479                         // At a crossroads here. We can accept either ([bd,An/PC],... or ([bd,An/PC,Xn*scale],...
 480                         if (*tok == ']')
 481                         {
 482                                 //([bd,An/PC],Xn,od)
 483                                 // Check for Xn
 484                                 tok++;
 485
 486                                 if (*tok == ')')
 487                                 {
 488                                         //Xn and od are non existent, get out of jail free card
 489                                         tok++;
 490                                         AMn = MEMPRE;                   // ([bc,An,Xn],od) with no Xn and od
 491                                         AnEXTEN |= EXT_IS | EXT_IISPREN;        //Suppress Xn and od
 492                                         goto AnOK;
 493                                 }
 494                                 else if (*tok != ',')
 495                                         return error("comma expected after ]");
 496                                 else
 497                                         tok++;                          // eat the comma
 498
 499                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 500                                 {
 501                                         AnIXREG = ((*tok & 7) << 12);
 502                                         AnEXTEN |= EXT_A;
 503                                         tok++;
 504                                 }
 505                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 506                                 {
 507                                         AnEXTEN |= ((*tok & 7) << 12);
 508                                         AnEXTEN |= EXT_D;
 509                                         tok++;
 510                                 }
 511                                 else
 512                                 {
 513                                         //No index found, suppress it
 514                                         AnEXTEN |= EXT_IS;
 515                                         tok--;                                  // Rewind tok to point to the comma
 516                                         goto IS_SUPPRESSEDn;    // https://xkcd.com/292/ - what does he know anyway?
 517                                 }
 518
 519                                 // Check for size
 520                                 // ([bd,An/PC],Xn.W/L...)
 521                                 switch ((int)*tok)
 522                                 {
 523                                 // Index reg size: <empty> | .W | .L
 524                                 case DOTW:
 525                                         tok++;
 526                                         break;
 527                                 default:
 528                                         break;
 529                                 case DOTL:
 530                                         AnEXTEN |= EXT_L;
 531                                         tok++;
 532                                         break;
 533                                 case DOTB:
 534                                         // .B not allowed here...
 535                                         goto badmode;
 536                                 }
 537
 538                                 // Check for scale
 539                                 if (*tok == '*')                   // ([bd,An/PC],Xn*...)
 540                                 {                                  // scale: *1, *2, *4, *8
 541                                         tok++;
 542
 543                                         if (*tok == SYMBOL)
 544                                         {
 545                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 546                                                         return error("scale factor expression must evaluate");
 547
 548                                                 switch (scaleval)
 549                                                 {
 550                                                 case 1:
 551                                                         break;
 552                                                 case 2:
 553                                                         AnIXSIZ |= TIMES2;
 554                                                         break;
 555                                                 case 4:
 556                                                         AnIXSIZ |= TIMES4;
 557                                                         break;
 558                                                 case 8:
 559                                                         AnIXSIZ |= TIMES8;
 560                                                         break;
 561                                                 default:
 562                                                         goto badmode;
 563                                                 }
 564                                         }
 565                                         else if (*tok++ != CONST)
 566                                                 goto badmode;
 567                                         else
 568                                         {
 569                                                 switch ((int)*tok++)
 570                                                 {
 571                                                 case 1:
 572                                                         break;
 573                                                 case 2:
 574                                                         AnIXSIZ |= TIMES2;
 575                                                         break;
 576                                                 case 4:
 577                                                         AnIXSIZ |= TIMES4;
 578                                                         break;
 579                                                 case 8:
 580                                                         AnIXSIZ |= TIMES8;
 581                                                         break;
 582                                                 default:
 583                                                         goto badmode;
 584                                                 }
 585
 586                                                 tok++;  // Take into account that constants are 64-bit
 587                                         }
 588                                 }
 589
 590                                 // Check for od
 591                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 592                                 {
 593                                         // od is non existent, get out of jail free card
 594                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 595                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 596                                         tok++;
 597                                         goto AnOK;
 598                                 }
 599                                 else if (*tok != ',')
 600                                         return error("comma expected");
 601                                 else
 602                                         tok++;  // eat the comma
 603
 604 CHECKODn:
 605                                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 606                                         goto badmode;
 607
 608                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXATTR & DEFINED) && (AnEXVAL == 0))
 609                                 {
 610                                         // od=0 so optimise it out
 611                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 612                                         AnEXTEN |= EXT_IISPOSN; // No outer displacement
 613                                         tok++;
 614                                         goto AnOK;
 615                                 }
 616
 617                                 // ([bd,An/PC],Xn,od)
 618                                 if (*tok == DOTL)
 619                                 {
 620                                         // expr.L
 621                                         if (!(AnEXTEN & EXT_BS))
 622                                                 AnEXTEN |= EXT_IISPOSL; // Long outer displacement
 623                                         else
 624                                         {
 625                                                 // bd is suppressed, so sticking the od size in bd
 626                                                 AnEXTEN |= EXT_BDSIZEL;
 627                                                 // And of course the expression has to be copied to
 628                                                 // AnBEXPR instead of AnEXPR. Yay. :-/
 629                                                 int i = 0;
 630
 631                                                 do
 632                                                 {
 633                                                         AnBEXPR[i] = AnEXPR[i];
 634                                                         i++;
 635                                                 }
 636                                                 while (AnEXPR[i] != 'E');
 637
 638                                                 AnBEXPR[i] = 'E';
 639                                         }
 640
 641                                         AMn = MEMPOST;
 642                                         tok++;
 643
 644                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 645                                         // optimized to absolute short
 646                                         if (CHECK_OPTS(OPT_ABS_SHORT)
 647                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 648                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 649                                         {
 650                                                 AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 651                                                 AMn = MEMPOST;
 652                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 653                                         }
 654
 655                                 }
 656                                 else
 657                                 {
 658                                         // expr[.W]
 659                                         AnEXTEN |= EXT_IISPOSW; // Word outer displacement
 660                                         AMn = MEMPOST;
 661
 662                                         // Is .W forced here?
 663                                         if (*tok == DOTW)
 664                                                 tok++;
 665                                 }
 666
 667                                 // Check for final closing parenthesis
 668                                 if (*tok == ')')
 669                                 {
 670                                         tok++;
 671                                         goto AnOK;
 672                                 }
 673                                 else
 674                                         return error("Closing parenthesis missing on addressing mode");
 675
 676 IS_SUPPRESSEDn:
 677
 678                                 // Check for od
 679                                 if (*tok == ')')        // ([bd,An/PC],Xn)
 680                                 {
 681                                         // od is non existent, get out of jail free card
 682                                         AMn = MEMPOST;          // let's say it's ([bd,An],Xn,od) with od=0 then
 683                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 684                                         tok++;
 685                                         goto AnOK;
 686                                 }
 687                                 else if (*tok!=',')
 688                                         return error("comma expected");
 689                                 else
 690                                         tok++;  // eat the comma
 691
 692                                 if ((*tok != CONST) && (*tok != SYMBOL))
 693                                         goto badmode;
 694
 695                                 expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM);
 696
 697                                 if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0))
 698                                 {
 699                                         // od=0 so optimise it out
 700                                         AMn = MEMPOST;           // let's say it's ([bd,An],Xn,od) with od=0 then
 701                                         AnEXTEN |= EXT_IISNOIN; // No outer displacement
 702                                         tok++;
 703                                         goto AnOK;
 704                                 }
 705
 706                                 // ([bd,An/PC],Xn,od)
 707                                 if (*tok == DOTL)
 708                                 {
 709                                         // expr.L
 710                                         tok++;
 711                                         AMn = MEMPOST;
 712                                         AnEXTEN |= EXT_IISNOIL; // Long outer displacement with IS suppressed
 713                                 }
 714                                 else
 715                                 {
 716                                         // expr[.W][]
 717                                         AnEXTEN |= EXT_IISNOIW; // Word outer displacement with IS suppressed
 718                                         AMn = MEMPRE;
 719
 720                                         if (*tok == DOTW)
 721                                         {
 722                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement
 723                                                 AMn = MEMPOST;
 724                                                 tok++;
 725                                         }
 726                                         // Defined, absolute values from $FFFF8000..$00007FFF get
 727                                         // optimized to absolute short
 728                                         else if (CHECK_OPTS(OPT_BASE_DISP)
 729                                                 && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 730                                                 && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 731                                         {
 732                                                 //AnEXTEN|=EXT_IISNOIW; // Word outer displacement with IS suppressed
 733                                                 warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 734                                         }
 735                                 }
 736
 737                                 // Check for final closing parenthesis
 738                                 if (*tok == ')')
 739                                 {
 740                                         tok++;
 741                                         goto AnOK;
 742                                 }
 743                                 else
 744                                         return error("Closing parenthesis missing on addressing mode");
 745                         }
 746                         else if (*tok == ',')
 747                         {
 748                                 tok++;                  // ([bd,An,Xn.size*scale],od)
 749
 750                                 // Check for Xn
 751                                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
 752                                 {
 753                                         AnEXTEN |= ((*tok & 7) << 12);
 754                                         AnEXTEN |= EXT_A;
 755                                         tok++;
 756                                 }
 757                                 else if ((*tok >= KW_D0) && (*tok <= KW_D7))
 758                                 {
 759                                         AnEXTEN |= ((*tok & 7) << 12);
 760                                         AnEXTEN |= EXT_D;
 761                                         tok++;
 762                                 }
 763
 764                                 // Check for size
 765                                 // ([bd,An/PC],Xn.W/L...)
 766                                 switch ((int)*tok)
 767                                 {
 768                                 // Index reg size: <empty> | .W | .L
 769                                 case DOTW:
 770                                         tok++;
 771                                         break;
 772                                 default:
 773                                         break;
 774                                 case DOTL:
 775                                         tok++;
 776                                         AnEXTEN |= EXT_L;
 777                                         break;
 778                                 case DOTB:
 779                                 // .B not allowed here...
 780                                 goto badmode;
 781                                 }
 782
 783                                 // Check for scale
 784                                 if (*tok == '*')                                // ([bd,An/PC],Xn*...)
 785                                 {                                                               // scale: *1, *2, *4, *8
 786                                         tok++;
 787
 788                                         if (*tok == SYMBOL)
 789                                         {
 790                                                 if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
 791                                                         return error("scale factor expression must evaluate");
 792
 793                                                 switch (scaleval)
 794                                                 {
 795                                                 case 1:
 796                                                         break;
 797                                                 case 2:
 798                                                         AnIXSIZ |= TIMES2;
 799                                                         break;
 800                                                 case 4:
 801                                                         AnIXSIZ |= TIMES4;
 802                                                         break;
 803                                                 case 8:
 804                                                         AnIXSIZ |= TIMES8;
 805                                                         break;
 806                                                 default:
 807                                                         goto badmode;
 808                                                 }
 809                                         }
 810                                         else if (*tok++ != CONST)
 811                                                 goto badmode;
 812                                         else
 813                                         {
 814                                                 switch ((int)*tok++)
 815                                                 {
 816                                                 case 1:
 817                                                         break;
 818                                                 case 2:
 819                                                         AnIXSIZ |= TIMES2;
 820                                                         AnEXTEN |= 1 << 9;
 821                                                         break;
 822                                                 case 4:
 823                                                         AnIXSIZ |= TIMES4;
 824                                                         AnEXTEN |= 2 << 9;
 825                                                         break;
 826                                                 case 8:
 827                                                         AnIXSIZ |= TIMES8;
 828                                                         AnEXTEN |= 3 << 9;
 829                                                         break;
 830                                                 default:
 831                                                         goto badmode;
 832                                                 }
 833
 834                                                 tok++;  // Take into account that constants are 64-bit
 835                                         }
 836                                 }
 837
 838                                 // Check for ]
 839                                 if (*tok != ']')
 840                                         return error("Expected closing bracket ]");
 841                                 tok++;                  // Eat the bracket
 842
 843                                 // Check for od
 844                                 if (*tok == ')')        // ([bd,An/PC,Xn]...
 845                                 {
 846                                         // od is non existent, get out of jail free card
 847                                         //AnEXVAL=0;            // zero outer displacement
 848                                         AMn = MEMPRE;                   // let's say it's ([bd,An,Xn],od) with od suppressed then
 849                                         AnEXTEN |= EXT_IISPREN; // No outer displacement
 850                                         tok++;
 851                                         goto AnOK;
 852                                 }
 853                                 else if (*tok++ != ',')
 854                                         return error("comma expected after ]");
 855
 856                                 if (*tok == SYMBOL || *tok == CONST)
 857                                 {
 858                                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 859                                                 goto badmode;
 860
 861                                         if (CHECK_OPTS(OPT_BASE_DISP) && (AnEXVAL == 0) && (AnEXATTR & DEFINED))
 862                                         {
 863                                                 // od=0 so optimise it out
 864                                                 AMn = MEMPRE;            // let's say it's ([bd,An],Xn,od) with od=0 then
 865                                                 AnEXTEN |= EXT_IISPRE0; // No outer displacement
 866                                                 tok++;
 867                                                 goto AnOK;
 868                                         }
 869                                 }
 870
 871                                 // ([bd,An/PC,Xn],od)
 872                                 if (*tok == DOTL)
 873                                 {
 874                                         // expr.L
 875                                         AMn = MEMPRE;
 876                                         tok++;
 877                                         AnEXTEN |= EXT_IISPREL;
 878                                 }
 879                                 else
 880                                 {
 881                                         // expr.[W]
 882                                         AMn = MEMPRE;
 883                                         int expr_size = EXT_IISPREW; // Assume we have a .w value
 884
 885                                         if ((AnEXVAL + 0x8000) > 0x10000)
 886                                         {
 887                                                 // Long value, so mark it as such for now
 888                                                 expr_size = EXT_IISPREL;
 889
 890                                                 // Defined, absolute values from $FFFF8000..$00007FFF
 891                                                 // get optimized to absolute short
 892                                                 if (CHECK_OPTS(OPT_BASE_DISP)
 893                                                         && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
 894                                                         && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
 895                                                 {
 896                                                         expr_size = EXT_IISPREW;
 897                                                         warn("outer displacement absolute value from $FFFF8000..$00007FFF optimised to absolute short");
 898                                                 }
 899                                         }
 900
 901                                         AnEXTEN |= expr_size; // Assume we have a .w value
 902
 903                                         // Is .W forced here?
 904                                         if (*tok == DOTW)
 905                                         {
 906                                                 tok++;
 907
 908                                                 if (expr_size == EXT_IISPREL)
 909                                                         return error("outer displacement value does not fit in .w size");
 910                                         }
 911                                 }
 912
 913                                 // Check for final closing parenthesis
 914                                 if (*tok == ')')
 915                                 {
 916                                         tok++;
 917                                         goto AnOK;
 918                                 }
 919                                 else
 920                                         return error("Closing parenthesis missing on addressing mode");
 921                         }
 922                         else
 923                                 goto badmode;
 924                 }
 925                 else
 926                 {
 927                         // (expr...
 928                         if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
 929                                 return ERROR;
 930
 931                         // It could be that this is really just an expression prefixing a
 932                         // register as a displacement...
 933                         if (*tok == ')')
 934                         {
 935                                 tok++;
 936                                 goto CHK_FOR_DISPn;
 937                         }
 938
 939                         // Otherwise, check for PC & etc displacements...
 940                         if (*tok++ != ',')
 941                                 goto badmode;
 942
 943                         if ((*tok >= KW_A0) && (*tok <= KW_A7))
 944                         {
 945                                 AnREG = *tok & 7;
 946                                 tok++;
 947
 948                                 if (*tok == ',')
 949                                 {
 950                                         // Check if we're actually doing d8(An,Dn) or
 951                                         // (d16,An,Dn[.size][*scale])
 952                                         // TODO: not a very clear cut case from what I can think.
 953                                         // The only way to distinguish between the two is to check
 954                                         // AnEXVAL and see if it's >127 or <-128. But this doesn't
 955                                         // work if AnEXVAL isn't defined yet. For now we fall
 956                                         // through to d8(An,Dn) but this might bite us in the arse
 957                                         // during fixups...
 958                                         if ((AnEXATTR & DEFINED) && (AnEXVAL + 0x80 > 0x100))
 959                                         {
 960                                                 // We're going to treat it as a full extension format
 961                                                 // with no indirect access and no base displacement/
 962                                                 // index register suppression
 963                                                 AnEXTEN |= EXT_FULLWORD;        // Definitely using full extension format, so set bit 8
 964                                                 AnEXTEN |= EXT_IISPRE0;         // No Memory Indirect Action
 965                                                 AnEXTEN |= EXT_BDSIZEL;         // Base Displacement Size Long
 966                                                 tok++;                                          // Get past the comma
 967
 968                                                 // Our expression is techically a base displacement,
 969                                                 // so let's copy it to the relevant variables so
 970                                                 // eagen0.c can pick it up properly
 971                                                 //AnBEXPR = AnEXPR;
 972                                                 AnBEXVAL = AnEXVAL;
 973                                                 AnBEXATTR = AnEXATTR;
 974
 975                                                 if ((*tok >= KW_D0) && (*tok <= KW_D7))
 976                                                 {
 977                                                         AnEXTEN |= ((*tok++) & 7) << 12;
 978                                                         // Check for size
 979                                                         {
 980                                                                 switch ((int)*tok)
 981                                                                 {
 982                                                                 // Index reg size: <empty> | .W | .L
 983                                                                 case DOTW:
 984                                                                         tok++;
 985                                                                         break;
 986                                                                 default:
 987                                                                         break;
 988                                                                 case DOTL:
 989                                                                         tok++;
 990                                                                         AnEXTEN |= EXT_L;
 991                                                                         break;
 992                                                                 case DOTB:
 993                                                                         // .B not allowed here...
 994                                                                         goto badmode;
 995                                                                 }
 996                                                         }
 997                                                         // Check for scale
 998                                                         if (*tok == '*')                // ([bd,An/PC],Xn*...)
 999                                                         {                                               // scale: *1, *2, *4, *8
1000                                                                 tok++;
1001
1002                                                                 if (*tok == SYMBOL)
1003                                                                 {
1004                                                                         if (expr(scaleexpr, &scaleval, &scaleattr, &scaleesym) != OK)
1005                                                                                 return error("scale factor expression must evaluate");
1006
1007                                                                         switch (scaleval)
1008                                                                         {
1009                                                                         case 1:
1010                                                                                 break;
1011                                                                         case 2:
1012                                                                                 AnIXSIZ |= TIMES2;
1013                                                                                 break;
1014                                                                         case 4:
1015                                                                                 AnIXSIZ |= TIMES4;
1016                                                                                 break;
1017                                                                         case 8:
1018                                                                                 AnIXSIZ |= TIMES8;
1019                                                                                 break;
1020                                                                         default:
1021                                                                                 goto badmode;
1022                                                                         }
1023                                                                 }
1024                                                                 else if (*tok++ != CONST)
1025                                                                         goto badmode;
1026                                                                 else
1027                                                                 {
1028                                                                         switch ((int)*tok++)
1029                                                                         {
1030                                                                         case 1:
1031                                                                                 break;
1032                                                                         case 2:
1033                                                                                 AnIXSIZ |= TIMES2;
1034                                                                                 break;
1035                                                                         case 4:
1036                                                                                 AnIXSIZ |= TIMES4;
1037                                                                                 break;
1038                                                                         case 8:
1039                                                                                 AnIXSIZ |= TIMES8;
1040                                                                                 break;
1041                                                                         default:
1042                                                                                 goto badmode;
1043                                                                         }
1044
1045                                                                         tok++;  // Take into account that constants are 64-bit
1046                                                                 }
1047                                                         }
1048
1049                                                         if (*tok++ != ')')
1050                                                                 return error("Closing parenthesis missing on addressing mode");
1051
1052                                                         // Let's say that this is the closest to our case
1053                                                         AMn = MEMPOST;
1054                                                         goto AnOK;
1055                                                 }
1056                                                 else
1057                                                         goto badmode;
1058                                         }
1059
1060                                         AMn = AINDEXED;
1061                                         goto AMn_IXN;
1062                                 }
1063                                 else if (*tok == ')')
1064                                 {
1065                                         AMn = ADISP;
1066                                         tok++;
1067                                         goto AnOK;
1068                                 }
1069                                 else
1070                                         goto badmode;
1071                         }
1072                         else if (*tok == KW_PC)
1073                         {
1074                                 if (*++tok == ',')
1075                                 {                             // expr(PC,Xn...)
1076                                         AMn = PCINDEXED;
1077                                         goto AMn_IXN;
1078                                 }
1079                                 else if (*tok == ')')
1080                                 {
1081                                         AMn = PCDISP;             // expr(PC)
1082                                         tok++;
1083                                         goto AnOK;
1084                                 }
1085                                 else
1086                                         goto badmode;
1087                         }
1088                         else
1089                                 goto badmode;
1090                 }
1091         }
1092         else if (*tok == '-' && tok[1] == '(' && ((tok[2] >= KW_A0) && (tok[2] <= KW_A7)) && tok[3] == ')')
1093         {
1094                 AMn = APREDEC;
1095                 AnREG = tok[2] & 7;
1096                 tok += 4;
1097         }
1098         else if (*tok == KW_CCR)
1099         {
1100                 AMn = AM_CCR;
1101                 tok++;
1102                 goto AnOK;
1103         }
1104         else if (*tok == KW_SR)
1105         {
1106                 AMn = AM_SR;
1107                 tok++;
1108                 goto AnOK;
1109         }
1110         else if (*tok == KW_USP)
1111         {
1112                 AMn = AM_USP;
1113                 tok++;
1114                 AnREG = 2;      // Added this for the case of USP used in movec (see CREGlut in mach.c). Hopefully nothing gets broken!
1115                 goto AnOK;
1116         }
1117         else if ((*tok >= KW_IC40) && (*tok <= KW_BC40))
1118         {
1119                 AMn = CACHES;
1120                 AnREG = *tok++ - KW_IC40;
1121
1122                 // After a cache keyword only a comma or EOL is allowed
1123                 if ((*tok != ',') && (*tok != EOL))
1124                         return ERROR;
1125                 goto AnOK;
1126         }
1127         else if ((*tok >= KW_SFC) && (*tok <= KW_CRP))
1128         {
1129                 AMn = CREG;
1130                 AnREG = (*tok++) - KW_SFC;
1131                 goto AnOK;
1132         }
1133         else if ((*tok >= KW_FP0) && (*tok <= KW_FP7))
1134         {
1135                 AMn = FREG;
1136                 AnREG = (*tok++ & 7);
1137         }
1138         else if ((*tok >= KW_FPIAR) && (*tok <= KW_FPCR))
1139         {
1140                 AMn = FPSCR;
1141                 AnREG = (1 << ((*tok++) - KW_FPIAR + 10));
1142         }
1143         // expr
1144         // expr.w
1145         // expr.l
1146         // d16(An)
1147         // d8(An,Xn[.siz])
1148         // d16(PC)
1149         // d8(PC,Xn[.siz])
1150         else
1151         {
1152                 if (expr(AnEXPR, &AnEXVAL, &AnEXATTR, &AnESYM) != OK)
1153                         return ERROR;
1154
1155 CHK_FOR_DISPn:
1156                 if (*tok == DOTW)
1157                 {
1158                         // expr.W
1159                         tok++;
1160                         AMn = ABSW;
1161
1162                         if (((AnEXATTR & (TDB | DEFINED)) == DEFINED) && (AnEXVAL < 0x10000))
1163                                 AnEXVAL = (int32_t)(int16_t)AnEXVAL;  // Sign extend value
1164
1165                         goto AnOK;
1166                 }
1167                 else if (*tok != '(')
1168                 {
1169                         // expr[.L]
1170                         AMn = ABSL;
1171
1172                         // .L is forced here
1173                         if (*tok == DOTL)
1174                         {
1175                                 tok++;
1176                                 AMn = ABSL;
1177                         }
1178                         else
1179                         {
1180                                 // Defined, absolute values from $FFFF8000..$00007FFF get
1181                                 // optimized to absolute short
1182                                 if (CHECK_OPTS(OPT_ABS_SHORT)
1183                                         && ((AnEXATTR & (TDB | DEFINED)) == DEFINED)
1184                                         && (((uint32_t)AnEXVAL + 0x8000) < 0x10000))
1185                                 {
1186                                         AMn = ABSW;
1187
1188                                         if (sbra_flag)
1189                                                 warn("absolute value from $FFFF8000..$00007FFF optimised to absolute short");
1190                                 }
1191                         }
1192
1193                         goto AnOK;
1194                 }
1195
1196                 tok++;
1197
1198                 if ((*tok >= KW_A0) && (*tok <= KW_A7))
1199                 {
1200                         AnREG = *tok++ & 7;
1201
1202                         if (*tok == ')')
1203                         {
1204                                 AMn = ADISP;
1205                                 tok++;
1206                                 goto AnOK;
1207                         }
1208
1209                         AMn = AINDEXED;
1210                         goto AMn_IXN;
1211                 }
1212                 else if (*tok == KW_PC)
1213                 {
1214                         if (*++tok == ')')
1215                         {
1216                                 AMn = PCDISP;
1217                                 tok++;
1218                                 goto AnOK;
1219                         }
1220
1221                         AMn = PCINDEXED;
1222                         goto AMn_IXN;
1223                 }
1224
1225                 goto badmode;
1226         }
1227
1228         // Addressing mode OK
1229 AnOK:
1230         ;
1231 }
1232
1233 // Clean up dirty little macros
1234 #undef AnOK
1235 #undef AMn
1236 #undef AnREG
1237 #undef AnIXREG
1238 #undef AnIXSIZ
1239 #undef AnEXPR
1240 #undef AnEXVAL
1241 #undef AnEXATTR
1242 #undef AnOEXPR
1243 #undef AnOEXVAL
1244 #undef AnOEXATTR
1245 #undef AnESYM
1246 #undef AMn_IX0
1247 #undef AMn_IXN
1248 #undef CHK_FOR_DISPn
1249 #undef AnBEXPR
1250 #undef AnBEXVAL
1251 #undef AnBEXATTR
1252 #undef AnBZISE
1253 #undef AnEXTEN
1254 #undef AMn_030
1255 #undef IS_SUPPRESSEDn
1256 #undef CHECKODn