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 "error.h"
  11 #include "mach.h"
  12 #include "token.h"
  13 #include "mark.h"
  14 #include "expr.h"
  15 #include "symbol.h"
  16 #include "risca.h"
  17 #include "listing.h"
  18
  19 // Section descriptors
  20 SECT sect[NSECTS];                                          // All sections...
  21 int cursect;                                                // Current section number
  22
  23 // These are copied from the section descriptor, the current code chunk descriptor and the current
  24 // fixup chunk descriptor when a switch is made into a section.  They are copied back to the
  25 // descriptors when the section is left.
  26 WORD scattr;                                                // Section attributes
  27 LONG sloc;                                                  // Current loc in section
  28
  29 CHUNK * scode;                                              // Current (last) code chunk
  30 LONG challoc;                                               // #bytes alloc'd to code chunk
  31 LONG ch_size;                                               // #bytes used in code chunk
  32 char * chptr;                                               // Deposit point in code chunk buffer
  33
  34 CHUNK * sfix;                                               // Current (last) fixup chunk
  35 LONG fchalloc;                                              // #bytes alloc'd to fixup chunk
  36 LONG fchsize;                                               // #bytes used in fixup chunk
  37 PTR fchptr;                                                 // Deposit point in fixup chunk buffer
  38
  39 unsigned fwdjump[MAXFWDJUMPS];                              // forward jump check table
  40 unsigned fwindex = 0;                                       // forward jump index
  41
  42 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is associated
  43 // with a location.
  44 static char fusiztab[] = {
  45    0,                                                       // FU_QUICK
  46    1,                                                       // FU_BYTE
  47    2,                                                       // FU_WORD
  48    2,                                                       // FU_WBYTE
  49    4,                                                       // FU_LONG
  50    1,                                                       // FU_BBRA
  51    0,                                                       // (unused)
  52    1,                                                       // FU_6BRA
  53 };
  54
  55 // Offset to REAL fixup location
  56 static char fusizoffs[] = {
  57    0,                                                       // FU_QUICK
  58    0,                                                       // FU_BYTE
  59    0,                                                       // FU_WORD
  60    1,                                                       // FU_WBYTE
  61    0,                                                       // FU_LONG
  62    1,                                                       // FU_BBRA
  63    0,                                                       // (unused)
  64    0,                                                       // FU_6BRA
  65 };
  66
  67
  68 //
  69 // Make a New (Clean) Section
  70 //
  71 void mksect(int sno, WORD attr)
  72 {
  73         SECT * p;                                                 // Section pointer
  74
  75         p = &sect[sno];
  76         p->scattr = attr;
  77         p->sloc = 0;
  78         p->scode = p->sfcode = NULL;
  79         p->sfix = p->sffix = NULL;
  80 }
  81
  82
  83 //
  84 // Switch to Another Section (Copy Section & Chunk Descriptors to Global Vars
  85 // for Fast Access)
  86 //
  87 void switchsect(int sno)
  88 {
  89         SECT * p;                                                // Section pointer
  90         CHUNK * cp;                                              // Chunk pointer
  91
  92         cursect = sno;
  93         p = &sect[sno];
  94
  95         scattr = p->scattr;                                      // Copy section vars
  96         sloc = p->sloc;
  97         scode = p->scode;
  98         sfix = p->sfix;
  99
 100         if ((cp = scode) != NULL)
 101         {                               // Copy code chunk vars
 102                 challoc = cp->challoc;
 103                 ch_size = cp->ch_size;
 104                 chptr = cp->chptr + ch_size;
 105         }
 106         else
 107                 challoc = ch_size = 0;
 108
 109         if ((cp = sfix) != NULL)
 110         {                                // Copy fixup chunk vars
 111                 fchalloc = cp->challoc;
 112                 fchsize = cp->ch_size;
 113                 fchptr.cp = cp->chptr + fchsize;
 114         }
 115         else
 116                 fchalloc = fchsize = 0;
 117 }
 118
 119
 120 //
 121 // Save Current Section
 122 //
 123 void savsect(void)
 124 {
 125         SECT * p = &sect[cursect];
 126
 127         p->scattr = scattr;                                      // Bailout section vars
 128         p->sloc = sloc;
 129
 130         if (scode != NULL)                                        // Bailout code chunk
 131                 scode->ch_size = ch_size;
 132
 133         if (sfix != NULL)                                         // Bailout fixup chunk
 134                 sfix->ch_size = fchsize;
 135 }
 136
 137
 138 //
 139 // Initialize Sections; Setup initial ABS, TEXT, DATA and BSS sections
 140 //
 141 void init_sect(void)
 142 {
 143         int i;                                                   // Iterator
 144
 145         // Cleanup all sections
 146         for(i=0; i<NSECTS; ++i)
 147                 mksect(i, 0);
 148
 149         // Construct default sections, make TEXT the current section
 150         mksect(ABS,   SUSED|SABS|SBSS);                          // ABS
 151         mksect(TEXT,  SUSED|TEXT     );                          // TEXT
 152         mksect(DATA,  SUSED|DATA     );                          // DATA
 153         mksect(BSS,   SUSED|BSS |SBSS);                          // BSS
 154 //      mksect(M6502, SUSED|TEXT     );                          // 6502 code section
 155
 156         switchsect(TEXT);                                        // Switch to TEXT for starters
 157 }
 158
 159
 160 //
 161 // Test to see if a location has a fixup sic'd on it.  This is used by the
 162 // listing generator to print 'xx's instead of '00's for forward references
 163 //
 164 int fixtest(int sno, LONG loc)
 165 {
 166         CHUNK * ch;
 167         PTR fup;
 168         char * fuend;
 169         WORD w;
 170         LONG xloc;
 171
 172         stopmark();                                              // Force update to sect[] variables
 173
 174         // Hairy, ugly linear search for a mark on our location;
 175         // the speed doesn't matter, since this is only done when generating a listing, which is SLOW.
 176         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 177         {
 178                 fup.cp = (char *)ch->chptr;
 179                 fuend = fup.cp + ch->ch_size;
 180
 181                 while (fup.cp < fuend)
 182                 {
 183                         w = *fup.wp++;
 184                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 185                         fup.wp += 2;
 186
 187                         if (xloc == loc)
 188                                 return (int)fusiztab[w & FUMASK];
 189
 190                         if (w & FU_EXPR)
 191                         {
 192                                 w = *fup.wp++;
 193                                 fup.lp += w;
 194                         }
 195                         else
 196                                 ++fup.lp;
 197                 }
 198         }
 199
 200         return 0;
 201 }
 202
 203
 204 //
 205 // Check that there are at least `amt' bytes left in the current chunk. If
 206 // there are not, allocate another chunk of at least `amt' bytes (and probably
 207 // more).
 208 //
 209 // If `amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 210 //
 211 int chcheck(LONG amt)
 212 {
 213         CHUNK * cp;
 214         SECT * p;
 215
 216         if (scattr & SBSS)
 217                 return 0;                             // If in BSS section, forget it
 218
 219         if (!amt)
 220                 amt = CH_THRESHOLD;
 221
 222         if ((int)(challoc - ch_size) >= (int)amt)
 223                 return 0;
 224
 225         if (amt < CH_CODE_SIZE)
 226                 amt = CH_CODE_SIZE;
 227
 228         p = &sect[cursect];
 229         cp = (CHUNK *)amem((long)(sizeof(CHUNK) + amt));
 230
 231         if (scode == NULL)
 232         {                                      // First chunk in section
 233                 cp->chprev = NULL;
 234                 p->sfcode = cp;
 235         }
 236         else
 237         {                                                 // Add chunk to other chunks
 238                 cp->chprev = scode;
 239                 scode->chnext = cp;
 240                 scode->ch_size = ch_size;                             // Save old chunk's globals
 241         }
 242
 243         // Setup chunk and global vars
 244         cp->chloc = sloc;
 245         cp->chnext = NULL;
 246         challoc = cp->challoc = amt;
 247         ch_size = cp->ch_size = 0;
 248         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 249         scode = p->scode = cp;
 250
 251         return 0;
 252 }
 253
 254
 255 //
 256 // Arrange for a fixup on a location
 257 //
 258 int fixup(WORD attr, LONG loc, TOKEN * fexpr)
 259 {
 260         LONG i;
 261         LONG len = 0;
 262         CHUNK * cp;
 263         SECT * p;
 264
 265         // Compute length of expression (could be faster); determine if it's the single-symbol case;
 266         // no expression if it's just a mark. This code assumes 16 bit WORDs and 32 bit LONGs
 267         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 268         {
 269                 if ((attr & 0x0F00) == FU_JR) // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 270                 {
 271                         i = 18;                  // Just a single symbol
 272                 }
 273                 else
 274                 {
 275                         i = 14;
 276                 }
 277         }
 278         else
 279         {
 280                 attr |= FU_EXPR;
 281
 282                 for(len=0; fexpr[len]!=ENDEXPR; ++len)
 283                 {
 284                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 285                                 ++len;
 286                 }
 287
 288                 ++len;                                                // Add 1 for ENDEXPR
 289                 i = (len << 2) + 12;
 290         }
 291
 292         // Maybe alloc another fixup chunk for this one to fit in
 293         if ((fchalloc - fchsize) < i)
 294         {
 295                 p = &sect[cursect];
 296                 cp = (CHUNK *)amem((long)(sizeof(CHUNK) + CH_FIXUP_SIZE));
 297
 298                 if (sfix == NULL)
 299                 {                                 // First fixup chunk in section
 300                         cp->chprev = NULL;
 301                         p->sffix = cp;
 302                 }
 303                 else
 304                 {                                           // Add to other chunks
 305                         cp->chprev = sfix;
 306                         sfix->chnext = cp;
 307                         sfix->ch_size = fchsize;
 308                 }
 309
 310                 // Setup fixup chunk and its global vars
 311                 cp->chnext = NULL;
 312                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 313                 fchsize = cp->ch_size = 0;
 314                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 315                 sfix = p->sfix = cp;
 316         }
 317
 318         // Record fixup type, fixup location, and the file number and line number the fixup is
 319         // located at.
 320         *fchptr.wp++ = attr;
 321         *fchptr.lp++ = loc;
 322         *fchptr.wp++ = cfileno;
 323         *fchptr.wp++ = (WORD)curlineno;
 324
 325         // Store postfix expression or pointer to a single symbol, or nothing for a mark.
 326         if (attr & FU_EXPR)
 327         {
 328                 *fchptr.wp++ = (WORD)len;
 329
 330                 while (len--)
 331                         *fchptr.lp++ = (LONG)*fexpr++;
 332         }
 333         else
 334         {
 335                 *fchptr.lp++ = (LONG)fexpr[1];
 336         }
 337
 338         if ((attr & 0x0F00) == FU_JR)  // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 339         {
 340                 if (orgactive)
 341                         *fchptr.lp++ = orgaddr;
 342                 else
 343                         *fchptr.lp++ = 0x00000000;
 344         }
 345
 346         fchsize += i;
 347
 348         return 0;
 349 }
 350
 351
 352 //
 353 // Resolve all Fixups
 354 //
 355 int fixups(void)
 356 {
 357         unsigned i;
 358         char buf[EBUFSIZ];
 359
 360         // Make undefined symbols GLOBL
 361         if (glob_flag)
 362                 syg_fix();
 363
 364         resfix(TEXT);
 365         resfix(DATA);
 366
 367         // We need to do a final check of forward 'jump' destination addresses that are external
 368         for(i=0; i<MAXFWDJUMPS; i++)
 369         {
 370                 if (fwdjump[i])
 371                 {
 372                         err_setup();
 373                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 374
 375                         if (listing > 0)
 376                                 ship_ln(buf);
 377
 378                         if (err_flag)
 379                                 write(err_fd, buf, (LONG)strlen(buf));
 380                         else
 381                                 printf("%s\n", buf);
 382                 }
 383         }
 384
 385         return 0;
 386 }
 387
 388
 389 //
 390 // Resolve Fixups in a Section
 391 //
 392 int resfix(int sno)
 393 {
 394         SECT * sc;                                      // Section
 395         CHUNK * ch;
 396         PTR fup;                                        // Current fixup
 397         WORD * fuend;                           // End of last fixup (in this chunk)
 398         CHUNK * cch;                            // Cached chunk for target
 399         WORD w;                                         // Fixup word (type+modes+flags)
 400         char * locp;                            // Location to fix (in cached chunk)
 401         LONG loc;                                       // Location to fixup
 402         VALUE eval;                                     // Expression value
 403         WORD eattr;                                     // Expression attrib
 404         SYM * esym;                                     // External symbol involved in expr
 405         SYM * sy;                                       // (Temp) pointer to a symbol
 406         WORD i;                                         // (Temp) word
 407         WORD tdb;                                       // eattr & TDB
 408         LONG oaddr;
 409         int reg2;
 410         WORD flags;
 411         unsigned page_jump = 0;
 412         unsigned address = 0;
 413         unsigned j;
 414         char buf[EBUFSIZ];
 415
 416         sc = &sect[sno];
 417         ch = sc->sffix;
 418
 419         if (ch == NULL)
 420                 return 0;
 421
 422         cch = sc->sfcode;                                        // "cache" first chunk
 423
 424         if (cch == NULL)                                          // Can't fixup a sect with nothing in it
 425                 return 0;
 426
 427         do
 428         {
 429                 fup.cp = ch->chptr;                                   // fup -> start of chunk
 430                 fuend = (WORD *)(fup.cp + ch->ch_size);               // fuend -> end of chunk
 431
 432                 while (fup.wp < fuend)
 433                 {
 434                         w = *fup.wp++;
 435                         loc = *fup.lp++;
 436                         cfileno = *fup.wp++;
 437                         curlineno = (int)*fup.wp++;
 438
 439                         esym = NULL;
 440
 441                         // Search for chunk containing location to fix up; compute a pointer to the location
 442                         // (in the chunk). Often we will find the fixup is in the "cached" chunk, so the
 443                         // linear-search is seldom executed.
 444                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 445                         {
 446                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 447                                 {
 448                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 449                                                 break;
 450                                 }
 451
 452                                 if (cch == NULL)
 453                                 {
 454                                         interror(7);                                 // Fixup (loc) out of range
 455                                         // NOTREACHED
 456                                 }
 457                         }
 458
 459                         locp = cch->chptr + (loc - cch->chloc);
 460
 461                         eattr = 0;
 462
 463                         // Compute expression/symbol value and attribs
 464                         if (w & FU_EXPR)
 465                         {                                  // Complex expression
 466                                 i = *fup.wp++;
 467
 468                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 469                                 {
 470                                         fup.lp += i;
 471                                         continue;
 472                                 }
 473
 474                                 fup.lp += i;
 475                         }
 476                         else
 477                         {                                           // Simple symbol
 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                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 501                                 esym->sattre |= RISCSYM;
 502
 503                         // Do the fixup
 504                         //
 505                         // If a PC-relative fixup is undefined, its value is *not* subtracted from the location
 506                         // (that will happen in the linker when the external reference is resolved).
 507                         //
 508                         // MWC expects PC-relative things to have the LOC subtracted from the value, if the
 509                         // value is external (that is, undefined at this point).
 510                         //
 511                         // PC-relative fixups must be DEFINED and either in the same section (whereupon the
 512                         // subtraction takes place) or ABS (with no subtract).
 513                         if (w & FU_PCREL)
 514                         {
 515                                 if (eattr & DEFINED)
 516                                 {
 517                                         if (tdb == sno)
 518                                                 eval -= (VALUE)loc;
 519                                         else if (tdb)
 520                                         {
 521                                                 error("PC-relative expr across sections");
 522                                                 continue;
 523                                         }
 524
 525                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 526                                                 warn("unoptimized short branch");
 527                                 }
 528                                 else if (obj_format == MWC)
 529                                         eval -= (VALUE)loc;
 530
 531                                 tdb = 0;
 532                                 eattr &= ~TDB;
 533                         }
 534
 535                         // Do fixup classes
 536                         switch ((int)(w & FUMASK))
 537                         {
 538                         // FU_BBRA fixes up a one-byte branch offset.
 539                         case FU_BBRA:
 540                                 if (!(eattr & DEFINED))
 541                                 {
 542                                         error("external short branch");
 543                                         continue;
 544                                 }
 545
 546                                 eval -= 2;
 547
 548                                 if (eval + 0x80 >= 0x100)
 549                                         goto range;
 550
 551                                 if (eval == 0)
 552                                 {
 553                                         error("illegal bra.s with zero offset");
 554                                         continue;
 555                                 }
 556
 557                                 *++locp = (char)eval;
 558                                 break;
 559                         // Fixup one-byte value at locp + 1.
 560                         case FU_WBYTE:
 561                                 ++locp;
 562                                 // FALLTHROUGH
 563                         // Fixup one-byte forward references
 564                         case FU_BYTE:
 565                                 if (!(eattr & DEFINED))
 566                                 {
 567                                         error("external byte reference");
 568                                         continue;
 569                                 }
 570
 571                                 if (tdb)
 572                                 {
 573                                         error("non-absolute byte reference");
 574                                         continue;
 575                                 }
 576
 577                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 578                                         goto range;
 579
 580                                 if (w & FU_SEXT)
 581                                 {
 582                                         if (eval + 0x100 >= 0x200)
 583                                                 goto range;
 584                                 }
 585                                 else if (eval >= 0x100)
 586                                         goto range;
 587
 588                                 *locp = (char)eval;
 589                                 break;
 590                         // Fixup WORD forward references;
 591                         // the word could be unaligned in the section buffer, so we have to be careful.
 592                         case FU_WORD:
 593                                 if (((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR))
 594                                 {
 595                                         oaddr = *fup.lp++;
 596
 597                                         if (oaddr)
 598                                         {
 599                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 600                                         }
 601                                         else
 602                                         {
 603                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 604                                         }
 605
 606                                         if ((w & 0x0F00) == FU_MJR)
 607                                         {
 608                                                 // Main code destination alignment checking here for forward declared labels
 609                                                 address = (oaddr) ? oaddr : loc;
 610
 611                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 612                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 613                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 614                                                 {
 615                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 616                                                                 "main memory and local gpu ram", address);
 617                                                 }
 618                                                 else
 619                                                 {
 620                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 621
 622                                                         if (page_jump)
 623                                                         {
 624                                                                 // This jump is to a page outside of the current 256 byte page
 625                                                                 if (eval % 4)
 626                                                                 {
 627                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 628                                                                 }
 629                                                         }
 630                                                         else
 631                                                         {
 632                                                                 // This jump is in the current 256 byte page
 633                                                                 if ((eval - 2) % 4)
 634                                                                 {
 635                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 636                                                                 }
 637                                                         }
 638                                                 }
 639                                         }
 640
 641                                         if ((reg2 < -16) || (reg2 > 15))
 642                                         {
 643                                                 error("relative jump out of range");
 644                                                 break;
 645                                         }
 646
 647                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 648                                         locp++;
 649                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 650                                         break;
 651                                 }
 652
 653                                 if ((w & 0x0F00) == FU_NUM15)
 654                                 {
 655                                         if (eval < -16 || eval > 15)
 656                                         {
 657                                                 error("constant out of range");
 658                                                 break;
 659                                         }
 660
 661                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 662                                         locp++;
 663                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 664                                         break;
 665                                 }
 666
 667                                 if ((w & 0x0F00) == FU_NUM31)
 668                                 {
 669                                         if (eval < 0 || eval > 31)
 670                                         {
 671                                                 error("constant out of range");
 672                                                 break;
 673                                         }
 674
 675                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 676                                         locp++;
 677                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 678                                         break;
 679                                 }
 680
 681                                 if ((w & 0x0F00) == FU_NUM32)
 682                                 {
 683                                         if (eval < 1 || eval > 32)
 684                                         {
 685                                                 error("constant out of range");
 686                                                 break;
 687                                         }
 688
 689                                         if (w & FU_SUB32)
 690                                                 eval = (32 - eval);
 691
 692                                         eval = (eval == 32) ? 0 : eval;
 693                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 694                                         locp++;
 695                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 696                                         break;
 697                                 }
 698
 699                                 if ((w & 0x0F00) == FU_REGONE)
 700                                 {
 701                                         if (eval < 0 || eval > 31)
 702                                         {
 703                                                 error("register value out of range");
 704                                                 break;
 705                                         }
 706
 707                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 708                                         locp++;
 709                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 710                                         break;
 711                                 }
 712
 713                                 if ((w & 0x0F00) == FU_REGTWO)
 714                                 {
 715                                         if (eval < 0 || eval > 31)
 716                                         {
 717                                                 error("register value out of range");
 718                                                 break;
 719                                         }
 720
 721                                         locp++;
 722                                         *locp = (char)(*locp | (eval & 0x1F));
 723                                         break;
 724                                 }
 725
 726                                 if (!(eattr & DEFINED))
 727                                 {
 728                                         if (w & FU_PCREL)
 729                                                 w = MPCREL | MWORD;
 730                                         else
 731                                                 w = MWORD;
 732
 733                                         rmark(sno, loc, 0, w, esym);
 734                                 }
 735                                 else
 736                                 {
 737                                         if (tdb)
 738                                                 rmark(sno, loc, tdb, MWORD, NULL);
 739
 740                                         if (w & FU_SEXT)
 741                                         {
 742                                                 if (eval + 0x10000 >= 0x20000)
 743                                                         goto range;
 744                                         }
 745                                         else
 746                                         {
 747                                                 // Range-check BRA and DBRA
 748                                                 if (w & FU_ISBRA)
 749                                                 {
 750                                                         if (eval + 0x8000 >= 0x10000)
 751                                                         goto range;
 752                                                 }
 753                                                 else if (eval >= 0x10000)
 754                                                         goto range;
 755                                         }
 756                                 }
 757
 758                                 *locp++ = (char)(eval >> 8);
 759                                 *locp = (char)eval;
 760                                 break;
 761                         // Fixup LONG forward references;
 762                         // the long could be unaligned in the section buffer, so be careful (again).
 763                         case FU_LONG:
 764                                 if ((w & 0x0F00) == FU_MOVEI)
 765                                 {
 766                                         address = loc + 4;
 767
 768                                         if (eattr & DEFINED)
 769                                         {
 770                                                 for(j=0; j<fwindex; j++)
 771                                                 {
 772                                                         if (fwdjump[j] == address)
 773                                                         {
 774                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 775
 776                                                                 if (page_jump)
 777                                                                 {
 778                                                                         if (eval % 4)
 779                                                                         {
 780                                                                                 err_setup();
 781                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 782
 783                                                                                 if (listing > 0)
 784                                                                                         ship_ln(buf);
 785
 786                                                                                 if (err_flag)
 787                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 788                                                                                 else
 789                                                                                         printf("%s\n", buf);
 790                                                                         }
 791                                                                 }
 792                                                                 else
 793                                                                 {
 794                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 795                                                                         {
 796                                                                                 err_setup();
 797                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 798
 799                                                                                 if (listing > 0)
 800                                                                                         ship_ln(buf);
 801
 802                                                                                 if (err_flag)
 803                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 804                                                                                 else
 805                                                                                         printf("%s\n", buf);
 806                                                                         }
 807                                                                 }
 808
 809                                                                 // Clear this jump as it has been checked
 810                                                                 fwdjump[j] = 0;
 811                                                                 j = fwindex;
 812                                                         }
 813                                                 }
 814                                         }
 815
 816                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 817                                         flags = (MLONG|MMOVEI);
 818                                 }
 819                                 else
 820                                         flags = MLONG;
 821
 822                                 if (!(eattr & DEFINED))
 823                                 {
 824                                         rmark(sno, loc, 0, flags, esym);
 825                                 }
 826                                 else if (tdb)
 827                                 {
 828                                         rmark(sno, loc, tdb, flags, NULL);
 829                                 }
 830
 831                                 *locp++ = (char)(eval >> 24);
 832                                 *locp++ = (char)(eval >> 16);
 833                                 *locp++ = (char)(eval >> 8);
 834                                 *locp = (char)eval;
 835                                 break;
 836                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 837                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 838                         case FU_QUICK:
 839                                 if (!(eattr & DEFINED))
 840                                 {
 841                                         error("External quick reference");
 842                                         continue;
 843                                 }
 844
 845                                 if (eval < 1 || eval > 8)
 846                                         goto range;
 847
 848                                 *locp |= (eval & 7) << 1;
 849                                 break;
 850                         // Fix up 6502 funny branch
 851                         case FU_6BRA:
 852                                 eval -= (loc + 1);
 853
 854                                 if (eval + 0x80 >= 0x100)
 855                                         goto range;
 856
 857                                 *locp = (char)eval;
 858                                 break;
 859                         default:
 860                                 interror(4);                                 // Bad fixup type
 861                                 // NOTREACHED
 862                         }
 863                         continue;
 864 range:
 865                         error("expression out of range");
 866                 }
 867
 868                 ch = ch->chnext;
 869         }
 870         while (ch != NULL);
 871
 872         return 0;
 873 }