Shamusworld >> Repos - rmac/blob - sect.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // SECT.C - Code Generation, Fixups and Section Management
   4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source utilised with the kind permission of Landon Dyer
   7 //
   8
   9 #include "sect.h"
  10 #include "direct.h"
  11 #include "error.h"
  12 #include "expr.h"
  13 #include "listing.h"
  14 #include "mach.h"
  15 #include "mark.h"
  16 #include "riscasm.h"
  17 #include "symbol.h"
  18 #include "token.h"
  19
  20
  21 // Function prototypes
  22 void MakeSection(int, WORD);
  23 void SwitchSection(int);
  24
  25 // Section descriptors
  26 SECT sect[NSECTS];              // All sections...
  27 int cursect;                    // Current section number
  28
  29 // These are copied from the section descriptor, the current code chunk
  30 // descriptor and the current fixup chunk descriptor when a switch is made into
  31 // a section.  They are copied back to the descriptors when the section is left.
  32 WORD scattr;                    // Section attributes
  33 LONG sloc;                              // Current loc in section
  34
  35 CHUNK * scode;                  // Current (last) code chunk
  36 LONG challoc;                   // # bytes alloc'd to code chunk
  37 LONG ch_size;                   // # bytes used in code chunk
  38 char * chptr;                   // Deposit point in code chunk buffer
  39
  40 CHUNK * sfix;                   // Current (last) fixup chunk
  41 LONG fchalloc;                  // # bytes alloc'd to fixup chunk
  42 LONG fchsize;                   // # bytes used in fixup chunk
  43 PTR fchptr;                             // Deposit point in fixup chunk buffer
  44
  45 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  46 // associated with a location.
  47 static char fusiztab[] = {
  48    0,   // FU_QUICK
  49    1,   // FU_BYTE
  50    2,   // FU_WORD
  51    2,   // FU_WBYTE
  52    4,   // FU_LONG
  53    1,   // FU_BBRA
  54    0,   // (unused)
  55    1,   // FU_6BRA
  56 };
  57
  58 // Offset to REAL fixup location
  59 static char fusizoffs[] = {
  60    0,   // FU_QUICK
  61    0,   // FU_BYTE
  62    0,   // FU_WORD
  63    1,   // FU_WBYTE
  64    0,   // FU_LONG
  65    1,   // FU_BBRA
  66    0,   // (unused)
  67    0,   // FU_6BRA
  68 };
  69
  70
  71 //
  72 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
  73 //
  74 void InitSection(void)
  75 {
  76         int i;
  77
  78         // Cleanup all sections
  79         for(i=0; i<NSECTS; i++)
  80                 MakeSection(i, 0);
  81
  82         // Construct default sections, make TEXT the current section
  83         MakeSection(ABS,  SUSED | SABS | SBSS);         // ABS
  84         MakeSection(TEXT, SUSED | TEXT       );         // TEXT
  85         MakeSection(DATA, SUSED | DATA       );         // DATA
  86         MakeSection(BSS,  SUSED | BSS  | SBSS);         // BSS
  87 //      MakeSection(M6502, SUSED | TEXT       );                // 6502 code section
  88
  89         // Switch to TEXT for starters
  90         SwitchSection(TEXT);
  91 }
  92
  93
  94 //
  95 // Make a new (clean) section
  96 //
  97 void MakeSection(int sno, WORD attr)
  98 {
  99         SECT * p = &sect[sno];
 100         p->scattr = attr;
 101         p->sloc = 0;
 102         p->scode = p->sfcode = NULL;
 103         p->sfix = p->sffix = NULL;
 104 }
 105
 106
 107 //
 108 // Switch to another section (copy section & chunk descriptors to global vars
 109 // for fast access)
 110 //
 111 void SwitchSection(int sno)
 112 {
 113         CHUNK * cp;
 114         cursect = sno;
 115         SECT * p = &sect[sno];
 116
 117         // Copy section vars
 118         scattr = p->scattr;
 119         sloc = p->sloc;
 120         scode = p->scode;
 121         sfix = p->sfix;
 122
 123         // Copy code chunk vars
 124         if ((cp = scode) != NULL)
 125         {
 126                 challoc = cp->challoc;
 127                 ch_size = cp->ch_size;
 128                 chptr = cp->chptr + ch_size;
 129         }
 130         else
 131                 challoc = ch_size = 0;
 132
 133         // Copy fixup chunk vars
 134         if ((cp = sfix) != NULL)
 135         {
 136                 fchalloc = cp->challoc;
 137                 fchsize = cp->ch_size;
 138                 fchptr.cp = cp->chptr + fchsize;
 139         }
 140         else
 141                 fchalloc = fchsize = 0;
 142 }
 143
 144
 145 //
 146 // Save current section
 147 //
 148 void SaveSection(void)
 149 {
 150         SECT * p = &sect[cursect];
 151
 152         p->scattr = scattr;                                             // Bailout section vars
 153         p->sloc = sloc;
 154
 155         if (scode != NULL)                                              // Bailout code chunk
 156                 scode->ch_size = ch_size;
 157
 158         if (sfix != NULL)                                               // Bailout fixup chunk
 159                 sfix->ch_size = fchsize;
 160 }
 161
 162
 163 //
 164 // Test to see if a location has a fixup sic'd on it.  This is used by the
 165 // listing generator to print 'xx's instead of '00's for forward references
 166 //
 167 int fixtest(int sno, LONG loc)
 168 {
 169         CHUNK * ch;
 170         PTR fup;
 171         char * fuend;
 172         WORD w;
 173         LONG xloc;
 174
 175         // Force update to sect[] variables
 176         StopMark();
 177
 178         // Hairy, ugly linear search for a mark on our location; the speed doesn't
 179         // matter, since this is only done when generating a listing, which is
 180         // SLOW.
 181         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 182         {
 183                 fup.cp = (char *)ch->chptr;
 184                 fuend = fup.cp + ch->ch_size;
 185
 186                 while (fup.cp < fuend)
 187                 {
 188                         w = *fup.wp++;
 189                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 190                         fup.wp += 2;
 191
 192                         if (xloc == loc)
 193                                 return (int)fusiztab[w & FUMASK];
 194
 195                         if (w & FU_EXPR)
 196                         {
 197                                 w = *fup.wp++;
 198                                 fup.lp += w;
 199                         }
 200                         else
 201                                 fup.lp++;
 202                 }
 203         }
 204
 205         return 0;
 206 }
 207
 208
 209 //
 210 // Check that there are at least 'amt' bytes left in the current chunk. If
 211 // there are not, allocate another chunk of at least 'amt' bytes (and probably
 212 // more).
 213 //
 214 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 215 //
 216 int chcheck(LONG amt)
 217 {
 218         DEBUG { printf("chcheck(%u)\n", amt); }
 219         // If in BSS section, no allocation required
 220         if (scattr & SBSS)
 221                 return 0;
 222
 223         if (!amt)
 224                 amt = CH_THRESHOLD;
 225
 226         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
 227         if ((int)(challoc - ch_size) >= (int)amt)
 228                 return 0;
 229
 230         if (amt < CH_CODE_SIZE)
 231                 amt = CH_CODE_SIZE;
 232
 233         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 234         SECT * p = &sect[cursect];
 235         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 236
 237         // First chunk in section
 238         if (scode == NULL)
 239         {
 240                 cp->chprev = NULL;
 241                 p->sfcode = cp;
 242         }
 243         // Add chunk to other chunks
 244         else
 245         {
 246                 cp->chprev = scode;
 247                 scode->chnext = cp;
 248                 scode->ch_size = ch_size;                       // Save old chunk's globals
 249         }
 250
 251         // Setup chunk and global vars
 252         cp->chloc = sloc;
 253         cp->chnext = NULL;
 254         challoc = cp->challoc = amt;
 255         ch_size = cp->ch_size = 0;
 256         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 257         scode = p->scode = cp;
 258
 259         return 0;
 260 }
 261
 262
 263 // This is really wrong. We need to make some proper structures here so we
 264 // don't have to count sizes of objects, that's what the compiler's for! :-P
 265 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
 266 //
 267 // Arrange for a fixup on a location
 268 //
 269 int AddFixup(WORD attr, LONG loc, TOKEN * fexpr)
 270 {
 271         LONG i;
 272         LONG len = 0;
 273         CHUNK * cp;
 274         SECT * p;
 275         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
 276         //         this.
 277 WARNING(!!! AddFixup() is filled with VOODOO !!!)
 278         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 279
 280         // Compute length of expression (could be faster); determine if it's the
 281         // single-symbol case; no expression if it's just a mark. This code assumes
 282         // 16 bit WORDs and 32 bit LONGs
 283         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 284         {
 285                 // Just a single symbol
 286                 // SCPCD : correct bit mask for attr (else other FU_xxx will match)
 287                 // NYAN !
 288                 if ((attr & FUMASKRISC) == FU_JR)
 289                 {
 290 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR)\n");
 291 //                      i = 18;
 292 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 293                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 294                 }
 295                 else
 296                 {
 297 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR) ELSE\n");
 298 //                      i = 14;
 299                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 300                 }
 301         }
 302         else
 303         {
 304 //printf("AddFixup: !SYMBOL\n");
 305                 attr |= FU_EXPR;
 306
 307                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 308                 {
 309                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 310                                 len++;
 311                 }
 312
 313                 len++;                                                          // Add 1 for ENDEXPR
 314 //              i = (len << 2) + 12;
 315                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 316         }
 317
 318         // Alloc another fixup chunk for this one to fit in if necessary
 319         if ((fchalloc - fchsize) < i)
 320         {
 321                 p = &sect[cursect];
 322                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 323
 324                 // First fixup chunk in section
 325                 if (sfix == NULL)
 326                 {
 327                         cp->chprev = NULL;
 328                         p->sffix = cp;
 329                 }
 330                 // Add to other chunks
 331                 else
 332                 {
 333                         cp->chprev = sfix;
 334                         sfix->chnext = cp;
 335                         sfix->ch_size = fchsize;
 336                 }
 337
 338                 // Setup fixup chunk and its global vars
 339                 cp->chnext = NULL;
 340                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 341                 fchsize = cp->ch_size = 0;
 342                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 343                 sfix = p->sfix = cp;
 344         }
 345
 346         // Record fixup type, fixup location, and the file number and line number
 347         // the fixup is located at.
 348         *fchptr.wp++ = attr;
 349         *fchptr.lp++ = loc;
 350         *fchptr.wp++ = cfileno;
 351         *fchptr.wp++ = (WORD)curlineno;
 352
 353         // Store postfix expression or pointer to a single symbol, or nothing for a
 354         // mark.
 355         if (attr & FU_EXPR)
 356         {
 357                 *fchptr.wp++ = (WORD)len;
 358
 359                 while (len--)
 360                         *fchptr.lp++ = (LONG)*fexpr++;
 361         }
 362         else
 363         {
 364 //              *fchptr.lp++ = (LONG)fexpr[1];
 365                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 366 //printf("AddFixup: adding symbol (%s) [%08X]\n", symbolPtr[fexpr[1]]->sname, symbolPtr[fexpr[1]]->sattr);
 367         }
 368
 369         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 370         if ((attr & FUMASKRISC) == FU_JR)
 371         {
 372                 if (orgactive)
 373                         *fchptr.lp++ = orgaddr;
 374                 else
 375                         *fchptr.lp++ = 0x00000000;
 376         }
 377
 378         fchsize += i;
 379         return 0;
 380 }
 381
 382
 383 //
 384 // Resolve fixups in a section
 385 //
 386 int ResolveFixups(int sno)
 387 {
 388         PTR fup;                                // Current fixup
 389         WORD * fuend;                   // End of last fixup (in this chunk)
 390         WORD w;                                 // Fixup word (type+modes+flags)
 391         char * locp;                    // Location to fix (in cached chunk)
 392         LONG loc;                               // Location to fixup
 393         VALUE eval;                             // Expression value
 394         WORD eattr;                             // Expression attrib
 395         SYM * esym;                             // External symbol involved in expr
 396         SYM * sy;                               // (Temp) pointer to a symbol
 397         WORD i;                                 // (Temp) word
 398         WORD tdb;                               // eattr & TDB
 399         LONG oaddr;
 400         int reg2;
 401         WORD flags;
 402         unsigned page_jump = 0;
 403         unsigned address = 0;
 404         //unsigned j;
 405         //char buf[EBUFSIZ];
 406
 407         SECT * sc = &sect[sno];
 408         CHUNK * ch = sc->sffix;
 409
 410         if (ch == NULL)
 411                 return 0;
 412
 413         // "Cache" first chunk
 414         CHUNK * cch = sc->sfcode;
 415
 416         // Can't fixup a section with nothing in it
 417         if (cch == NULL)
 418                 return 0;
 419
 420         do
 421         {
 422                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 423                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 424
 425                 while (fup.wp < fuend)
 426                 {
 427                         w = *fup.wp++;
 428                         loc = *fup.lp++;
 429                         cfileno = *fup.wp++;
 430                         curlineno = (int)*fup.wp++;
 431 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 432                         // This is based on global vars cfileno, curfname :-P
 433                         // This approach is kinda meh as well. I think we can do better than this.
 434                         SetFilenameForErrorReporting();
 435
 436                         esym = NULL;
 437
 438                         // Search for chunk containing location to fix up; compute a
 439                         // pointer to the location (in the chunk). Often we will find the
 440                         // fixup is in the "cached" chunk, so the linear-search is seldom
 441                         // executed.
 442                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 443                         {
 444                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 445                                 {
 446                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 447                                                 break;
 448                                 }
 449
 450                                 if (cch == NULL)
 451                                 {
 452                                         // Fixup (loc) out of range
 453                                         interror(7);
 454                                         // NOTREACHED
 455                                 }
 456                         }
 457
 458                         locp = cch->chptr + (loc - cch->chloc);
 459                         eattr = 0;
 460
 461                         // Compute expression/symbol value and attribs
 462                         // Complex expression
 463                         if (w & FU_EXPR)
 464                         {
 465                                 i = *fup.wp++;
 466
 467                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 468                                 {
 469                                         fup.lp += i;
 470                                         continue;
 471                                 }
 472
 473                                 fup.lp += i;
 474                         }
 475                         // Simple symbol
 476                         else
 477                         {
 478                                 sy = *fup.sy++;
 479                                 eattr = sy->sattr;
 480
 481                                 if (eattr & DEFINED)
 482                                         eval = sy->svalue;
 483                                 else
 484                                         eval = 0;
 485
 486                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 487                                         esym = sy;
 488                         }
 489
 490                         tdb = (WORD)(eattr & TDB);
 491
 492                         // If the expression is undefined and no external symbol is
 493                         // involved, then it's an error.
 494                         if (!(eattr & DEFINED) && (esym == NULL))
 495                         {
 496                                 error(undef_error);
 497                                 continue;
 498                         }
 499
 500 // It seems that this is completely unnecessary!
 501 #if 0
 502                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
 503 //{
 504 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
 505                                 esym->sattre |= RISCSYM;
 506 //}
 507 #endif
 508
 509                         // Do the fixup
 510                         //
 511                         // If a PC-relative fixup is undefined, its value is *not*
 512                         // subtracted from the location (that will happen in the linker
 513                         // when the external reference is resolved).
 514                         //
 515                         // MWC expects PC-relative things to have the LOC subtracted from
 516                         // the value, if the value is external (that is, undefined at this
 517                         // point).
 518                         //
 519                         // PC-relative fixups must be DEFINED and either in the same
 520                         // section (whereupon the subtraction takes place) or ABS (with no
 521                         // subtract).
 522                         if (w & FU_PCREL)
 523                         {
 524                                 if (eattr & DEFINED)
 525                                 {
 526                                         if (tdb == sno)
 527                                                 eval -= (VALUE)loc;
 528                                         else if (tdb)
 529                                         {
 530                                                 error("PC-relative expr across sections");
 531                                                 continue;
 532                                         }
 533
 534                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 535                                                 warn("unoptimized short branch");
 536                                 }
 537                                 else if (obj_format == MWC)
 538                                         eval -= (VALUE)loc;
 539
 540                                 tdb = 0;
 541                                 eattr &= ~TDB;
 542                         }
 543
 544                         // Do fixup classes
 545                         switch ((int)(w & FUMASK))
 546                         {
 547                         // FU_BBRA fixes up a one-byte branch offset.
 548                         case FU_BBRA:
 549                                 if (!(eattr & DEFINED))
 550                                 {
 551                                         error("external short branch");
 552                                         continue;
 553                                 }
 554
 555                                 eval -= 2;
 556
 557                                 if (eval + 0x80 >= 0x100)
 558                                         goto range;
 559
 560                                 if (eval == 0)
 561                                 {
 562                                         error("illegal bra.s with zero offset");
 563                                         continue;
 564                                 }
 565
 566                                 *++locp = (char)eval;
 567                                 break;
 568                         // Fixup one-byte value at locp + 1.
 569                         case FU_WBYTE:
 570                                 locp++;
 571                                 // FALLTHROUGH
 572                         // Fixup one-byte forward references
 573                         case FU_BYTE:
 574                                 if (!(eattr & DEFINED))
 575                                 {
 576                                         error("external byte reference");
 577                                         continue;
 578                                 }
 579
 580                                 if (tdb)
 581                                 {
 582                                         error("non-absolute byte reference");
 583                                         continue;
 584                                 }
 585
 586                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 587                                         goto range;
 588
 589                                 if (w & FU_SEXT)
 590                                 {
 591                                         if (eval + 0x100 >= 0x200)
 592                                                 goto range;
 593                                 }
 594                                 else if (eval >= 0x100)
 595                                         goto range;
 596
 597                                 *locp = (char)eval;
 598                                 break;
 599                         // Fixup WORD forward references;
 600                         // the word could be unaligned in the section buffer, so we have to
 601                         // be careful.
 602                         case FU_WORD:
 603                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
 604                                 {
 605                                         oaddr = *fup.lp++;
 606
 607                                         if (oaddr)
 608                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 609                                         else
 610                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 611
 612                                         if ((reg2 < -16) || (reg2 > 15))
 613                                         {
 614                                                 error("relative jump out of range");
 615                                                 break;
 616                                         }
 617
 618                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 619                                         locp++;
 620                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 621                                         break;
 622                                 }
 623
 624                                 if ((w & FUMASKRISC) == FU_NUM15)
 625                                 {
 626                                         if (eval < -16 || eval > 15)
 627                                         {
 628                                                 error("constant out of range");
 629                                                 break;
 630                                         }
 631
 632                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 633                                         locp++;
 634                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 635                                         break;
 636                                 }
 637
 638                                 if ((w & FUMASKRISC) == FU_NUM31)
 639                                 {
 640                                         if (eval < 0 || eval > 31)
 641                                         {
 642                                                 error("constant out of range");
 643                                                 break;
 644                                         }
 645
 646                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 647                                         locp++;
 648                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 649                                         break;
 650                                 }
 651
 652                                 if ((w & FUMASKRISC) == FU_NUM32)
 653                                 {
 654                                         if (eval < 1 || eval > 32)
 655                                         {
 656                                                 error("constant out of range");
 657                                                 break;
 658                                         }
 659
 660                                         if (w & FU_SUB32)
 661                                                 eval = (32 - eval);
 662
 663                                         eval = (eval == 32) ? 0 : eval;
 664                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 665                                         locp++;
 666                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 667                                         break;
 668                                 }
 669
 670                                 if ((w & FUMASKRISC) == FU_REGONE)
 671                                 {
 672                                         if (eval < 0 || eval > 31)
 673                                         {
 674                                                 error("register value out of range");
 675                                                 break;
 676                                         }
 677
 678                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 679                                         locp++;
 680                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 681                                         break;
 682                                 }
 683
 684                                 if ((w & FUMASKRISC) == FU_REGTWO)
 685                                 {
 686                                         if (eval < 0 || eval > 31)
 687                                         {
 688                                                 error("register value out of range");
 689                                                 break;
 690                                         }
 691
 692                                         locp++;
 693                                         *locp = (char)(*locp | (eval & 0x1F));
 694                                         break;
 695                                 }
 696
 697                                 if (!(eattr & DEFINED))
 698                                 {
 699                                         if (w & FU_PCREL)
 700                                                 w = MPCREL | MWORD;
 701                                         else
 702                                                 w = MWORD;
 703
 704                                         rmark(sno, loc, 0, w, esym);
 705                                 }
 706                                 else
 707                                 {
 708                                         if (tdb)
 709                                                 rmark(sno, loc, tdb, MWORD, NULL);
 710
 711                                         if (w & FU_SEXT)
 712                                         {
 713                                                 if (eval + 0x10000 >= 0x20000)
 714                                                         goto range;
 715                                         }
 716                                         else
 717                                         {
 718                                                 // Range-check BRA and DBRA
 719                                                 if (w & FU_ISBRA)
 720                                                 {
 721                                                         if (eval + 0x8000 >= 0x10000)
 722                                                         goto range;
 723                                                 }
 724                                                 else if (eval >= 0x10000)
 725                                                         goto range;
 726                                         }
 727                                 }
 728
 729                                 *locp++ = (char)(eval >> 8);
 730                                 *locp = (char)eval;
 731                                 break;
 732                         // Fixup LONG forward references;
 733                         // the long could be unaligned in the section buffer, so be careful
 734                         // (again).
 735                         case FU_LONG:
 736                                 if ((w & FUMASKRISC) == FU_MOVEI)
 737                                 {
 738                                         // Long constant in MOVEI # is word-swapped, so fix it here
 739                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 740                                         flags = (MLONG | MMOVEI);
 741                                 }
 742                                 else
 743                                         flags = MLONG;
 744
 745                                 if (!(eattr & DEFINED))
 746                                 {
 747 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
 748                                         rmark(sno, loc, 0, flags, esym);
 749                                 }
 750                                 else if (tdb)
 751                                 {
 752 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 753                                         rmark(sno, loc, tdb, flags, NULL);
 754                                 }
 755 //else
 756 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 757
 758                                 *locp++ = (char)(eval >> 24);
 759                                 *locp++ = (char)(eval >> 16);
 760                                 *locp++ = (char)(eval >> 8);
 761                                 *locp = (char)eval;
 762                                 break;
 763
 764                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 765                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 766                         case FU_QUICK:
 767                                 if (!(eattr & DEFINED))
 768                                 {
 769                                         error("External quick reference");
 770                                         continue;
 771                                 }
 772
 773                                 if (eval < 1 || eval > 8)
 774                                         goto range;
 775
 776                                 *locp |= (eval & 7) << 1;
 777                                 break;
 778
 779                         // Fix up 6502 funny branch
 780                         case FU_6BRA:
 781                                 eval -= (loc + 1);
 782
 783                                 if (eval + 0x80 >= 0x100)
 784                                         goto range;
 785
 786                                 *locp = (char)eval;
 787                                 break;
 788
 789                         default:
 790                                 // Bad fixup type--this should *never* happen!
 791                                 interror(4);
 792                                 // NOTREACHED
 793                         }
 794                         continue;
 795 range:
 796                         error("expression out of range");
 797                 }
 798
 799                 ch = ch->chnext;
 800         }
 801         while (ch != NULL);
 802
 803         return 0;
 804 }
 805
 806 //
 807 // Resolve all fixups
 808 //
 809 int ResolveAllFixups(void)
 810 {
 811         //unsigned i;
 812         //char buf[EBUFSIZ];
 813
 814         // Make undefined symbols GLOBL
 815         if (glob_flag)
 816                 ForceUndefinedSymbolsGlobal();
 817
 818         DEBUG printf("Resolving TEXT sections...\n");
 819         ResolveFixups(TEXT);
 820         DEBUG printf("Resolving DATA sections...\n");
 821         ResolveFixups(DATA);
 822
 823         return 0;
 824 }
 825
 826