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 "risca.h"
  17 #include "symbol.h"
  18 #include "token.h"
  19
  20 // Section descriptors
  21 SECT sect[NSECTS];                                              // All sections...
  22 int cursect;                                                    // Current section number
  23
  24 // These are copied from the section descriptor, the current code chunk
  25 // descriptor and the current fixup chunk descriptor when a switch is made into
  26 // a section.  They are copied back to the descriptors when the section is left.
  27 WORD scattr;                                                    // Section attributes
  28 LONG sloc;                                                              // Current loc in section
  29
  30 CHUNK * scode;                                                  // Current (last) code chunk
  31 LONG challoc;                                                   // # bytes alloc'd to code chunk
  32 LONG ch_size;                                                   // # bytes used in code chunk
  33 char * chptr;                                                   // Deposit point in code chunk buffer
  34
  35 CHUNK * sfix;                                                   // Current (last) fixup chunk
  36 LONG fchalloc;                                                  // # bytes alloc'd to fixup chunk
  37 LONG fchsize;                                                   // # bytes used in fixup chunk
  38 PTR fchptr;                                                             // Deposit point in fixup chunk buffer
  39
  40 unsigned fwdjump[MAXFWDJUMPS];                  // forward jump check table
  41 unsigned fwindex = 0;                                   // forward jump index
  42
  43 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  44 // associated with a location.
  45 static char fusiztab[] = {
  46    0,                                           // FU_QUICK
  47    1,                                           // FU_BYTE
  48    2,                                           // FU_WORD
  49    2,                                           // FU_WBYTE
  50    4,                                           // FU_LONG
  51    1,                                           // FU_BBRA
  52    0,                                           // (unused)
  53    1,                                           // FU_6BRA
  54 };
  55
  56 // Offset to REAL fixup location
  57 static char fusizoffs[] = {
  58    0,                                           // FU_QUICK
  59    0,                                           // FU_BYTE
  60    0,                                           // FU_WORD
  61    1,                                           // FU_WBYTE
  62    0,                                           // FU_LONG
  63    1,                                           // FU_BBRA
  64    0,                                           // (unused)
  65    0,                                           // FU_6BRA
  66 };
  67
  68
  69 //
  70 // Make a New (Clean) Section
  71 //
  72 void mksect(int sno, WORD attr)
  73 {
  74         SECT * p;                                                 // Section pointer
  75
  76         p = &sect[sno];
  77         p->scattr = attr;
  78         p->sloc = 0;
  79         p->scode = p->sfcode = NULL;
  80         p->sfix = p->sffix = NULL;
  81 }
  82
  83
  84 //
  85 // Switch to Another Section (Copy Section & Chunk Descriptors to Global Vars
  86 // for Fast Access)
  87 //
  88 void switchsect(int sno)
  89 {
  90         CHUNK * cp;                                                             // Chunk pointer
  91         cursect = sno;
  92         SECT * p = &sect[sno];
  93
  94         scattr = p->scattr;                                             // Copy section vars
  95         sloc = p->sloc;
  96         scode = p->scode;
  97         sfix = p->sfix;
  98
  99         // Copy code chunk vars
 100         if ((cp = scode) != NULL)
 101         {
 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         // Copy fixup chunk vars
 110         if ((cp = sfix) != NULL)
 111         {
 112                 fchalloc = cp->challoc;
 113                 fchsize = cp->ch_size;
 114                 fchptr.cp = cp->chptr + fchsize;
 115         }
 116         else
 117                 fchalloc = fchsize = 0;
 118 }
 119
 120
 121 //
 122 // Save Current Section
 123 //
 124 void savsect(void)
 125 {
 126         SECT * p = &sect[cursect];
 127
 128         p->scattr = scattr;                                      // Bailout section vars
 129         p->sloc = sloc;
 130
 131         if (scode != NULL)                                        // Bailout code chunk
 132                 scode->ch_size = ch_size;
 133
 134         if (sfix != NULL)                                         // Bailout fixup chunk
 135                 sfix->ch_size = fchsize;
 136 }
 137
 138
 139 //
 140 // Initialize Sections; Setup initial ABS, TEXT, DATA and BSS sections
 141 //
 142 void init_sect(void)
 143 {
 144         int i;
 145
 146         // Cleanup all sections
 147         for(i=0; i<NSECTS; i++)
 148                 mksect(i, 0);
 149
 150         // Construct default sections, make TEXT the current section
 151         mksect(ABS,   SUSED | SABS | SBSS);             // ABS
 152         mksect(TEXT,  SUSED | TEXT       );             // TEXT
 153         mksect(DATA,  SUSED | DATA       );             // DATA
 154         mksect(BSS,   SUSED | BSS | SBSS );             // BSS
 155 //      mksect(M6502, SUSED | TEXT       );             // 6502 code section
 156
 157         switchsect(TEXT);                                               // Switch to TEXT for starters
 158 }
 159
 160
 161 //
 162 // Test to see if a location has a fixup sic'd on it.  This is used by the
 163 // listing generator to print 'xx's instead of '00's for forward references
 164 //
 165 int fixtest(int sno, LONG loc)
 166 {
 167         CHUNK * ch;
 168         PTR fup;
 169         char * fuend;
 170         WORD w;
 171         LONG xloc;
 172
 173         stopmark();                                                             // Force update to sect[] variables
 174
 175         // Hairy, ugly linear search for a mark on our location;
 176         // the speed doesn't matter, since this is only done when generating a
 177         // listing, which is SLOW.
 178         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 179         {
 180                 fup.cp = (char *)ch->chptr;
 181                 fuend = fup.cp + ch->ch_size;
 182
 183                 while (fup.cp < fuend)
 184                 {
 185                         w = *fup.wp++;
 186                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 187                         fup.wp += 2;
 188
 189                         if (xloc == loc)
 190                                 return (int)fusiztab[w & FUMASK];
 191
 192                         if (w & FU_EXPR)
 193                         {
 194                                 w = *fup.wp++;
 195                                 fup.lp += w;
 196                         }
 197                         else
 198                                 ++fup.lp;
 199                 }
 200         }
 201
 202         return 0;
 203 }
 204
 205
 206 //
 207 // Check that there are at least `amt' bytes left in the current chunk. If
 208 // there are not, allocate another chunk of at least `amt' bytes (and probably
 209 // more).
 210 //
 211 // If `amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 212 //
 213 int chcheck(LONG amt)
 214 {
 215         // If in BSS section, no allocation required
 216         if (scattr & SBSS)
 217                 return 0;
 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         SECT * p = &sect[cursect];
 229         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 230
 231         // First chunk in section
 232         if (scode == NULL)
 233         {
 234                 cp->chprev = NULL;
 235                 p->sfcode = cp;
 236         }
 237         // Add chunk to other chunks
 238         else
 239         {
 240                 cp->chprev = scode;
 241                 scode->chnext = cp;
 242                 scode->ch_size = ch_size;                       // Save old chunk's globals
 243         }
 244
 245         // Setup chunk and global vars
 246         cp->chloc = sloc;
 247         cp->chnext = NULL;
 248         challoc = cp->challoc = amt;
 249         ch_size = cp->ch_size = 0;
 250         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 251         scode = p->scode = cp;
 252
 253         return 0;
 254 }
 255
 256
 257 // This is really wrong. We need to make some proper structures here so we don't
 258 // have to count sizes of objects, that's what the compiler's for! :-P
 259 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
 260 //
 261 // Arrange for a fixup on a location
 262 //
 263 int fixup(WORD attr, LONG loc, TOKEN * fexpr)
 264 {
 265         LONG i;
 266         LONG len = 0;
 267         CHUNK * cp;
 268         SECT * p;
 269         // Shamus: Expression lengths are voodoo ATM (varibale "i"). Need to fix this.
 270         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 271
 272         // Compute length of expression (could be faster); determine if it's the
 273         // single-symbol case; no expression if it's just a mark. This code assumes
 274         // 16 bit WORDs and 32 bit LONGs
 275         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 276         {
 277                 // Just a single symbol
 278                 // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 279                 if ((attr & 0x0F00) == FU_JR)
 280                 {
 281 //                      i = 18;
 282 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 283                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 284                 }
 285                 else
 286                 {
 287 //                      i = 14;
 288                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 289                 }
 290         }
 291         else
 292         {
 293                 attr |= FU_EXPR;
 294
 295                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 296                 {
 297                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 298                                 len++;
 299                 }
 300
 301                 len++;                                                          // Add 1 for ENDEXPR
 302 //              i = (len << 2) + 12;
 303                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 304         }
 305
 306         // Maybe alloc another fixup chunk for this one to fit in
 307         if ((fchalloc - fchsize) < i)
 308         {
 309                 p = &sect[cursect];
 310                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 311
 312                 // First fixup chunk in section
 313                 if (sfix == NULL)
 314                 {
 315                         cp->chprev = NULL;
 316                         p->sffix = cp;
 317                 }
 318                 // Add to other chunks
 319                 else
 320                 {
 321                         cp->chprev = sfix;
 322                         sfix->chnext = cp;
 323                         sfix->ch_size = fchsize;
 324                 }
 325
 326                 // Setup fixup chunk and its global vars
 327                 cp->chnext = NULL;
 328                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 329                 fchsize = cp->ch_size = 0;
 330                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 331                 sfix = p->sfix = cp;
 332         }
 333
 334         // Record fixup type, fixup location, and the file number and line number
 335         // the fixup is located at.
 336         *fchptr.wp++ = attr;
 337         *fchptr.lp++ = loc;
 338         *fchptr.wp++ = cfileno;
 339         *fchptr.wp++ = (WORD)curlineno;
 340
 341         // Store postfix expression or pointer to a single symbol, or nothing for a
 342         // mark.
 343         if (attr & FU_EXPR)
 344         {
 345                 *fchptr.wp++ = (WORD)len;
 346
 347                 while (len--)
 348                         *fchptr.lp++ = (LONG)*fexpr++;
 349         }
 350         else
 351         {
 352 //              *fchptr.lp++ = (LONG)fexpr[1];
 353                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 354         }
 355
 356         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 357         if ((attr & 0x0F00) == FU_JR)
 358         {
 359                 if (orgactive)
 360                         *fchptr.lp++ = orgaddr;
 361                 else
 362                         *fchptr.lp++ = 0x00000000;
 363         }
 364
 365         fchsize += i;
 366         return 0;
 367 }
 368
 369
 370 //
 371 // Resolve all Fixups
 372 //
 373 int ResolveAllFixups(void)
 374 {
 375         unsigned i;
 376         char buf[EBUFSIZ];
 377
 378         // Make undefined symbols GLOBL
 379         if (glob_flag)
 380                 syg_fix();
 381
 382         DEBUG printf("Resolving TEXT sections...\n");
 383         ResolveFixups(TEXT);
 384         DEBUG printf("Resolving DATA sections...\n");
 385         ResolveFixups(DATA);
 386
 387         // We need to do a final check of forward 'jump' destination addresses that
 388         // are external
 389         for(i=0; i<MAXFWDJUMPS; i++)
 390         {
 391                 if (fwdjump[i])
 392                 {
 393                         err_setup();
 394                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 395
 396                         if (listing > 0)
 397                                 ship_ln(buf);
 398
 399                         if (err_flag)
 400                                 write(err_fd, buf, (LONG)strlen(buf));
 401                         else
 402                                 printf("%s\n", buf);
 403                 }
 404         }
 405
 406         return 0;
 407 }
 408
 409
 410 //
 411 // Resolve Fixups in a Section
 412 //
 413 int ResolveFixups(int sno)
 414 {
 415         PTR fup;                                        // Current fixup
 416         WORD * fuend;                           // End of last fixup (in this chunk)
 417         WORD w;                                         // Fixup word (type+modes+flags)
 418         char * locp;                            // Location to fix (in cached chunk)
 419         LONG loc;                                       // Location to fixup
 420         VALUE eval;                                     // Expression value
 421         WORD eattr;                                     // Expression attrib
 422         SYM * esym;                                     // External symbol involved in expr
 423         SYM * sy;                                       // (Temp) pointer to a symbol
 424         WORD i;                                         // (Temp) word
 425         WORD tdb;                                       // eattr & TDB
 426         LONG oaddr;
 427         int reg2;
 428         WORD flags;
 429         unsigned page_jump = 0;
 430         unsigned address = 0;
 431         unsigned j;
 432         char buf[EBUFSIZ];
 433
 434         SECT * sc = &sect[sno];
 435         CHUNK * ch = sc->sffix;
 436
 437         if (ch == NULL)
 438                 return 0;
 439
 440         CHUNK * cch = sc->sfcode;                               // "cache" first chunk
 441
 442         if (cch == NULL)                                                // Can't fixup a sect with nothing in it
 443                 return 0;
 444
 445         do
 446         {
 447                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 448                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 449
 450                 while (fup.wp < fuend)
 451                 {
 452                         w = *fup.wp++;
 453                         loc = *fup.lp++;
 454                         cfileno = *fup.wp++;
 455                         curlineno = (int)*fup.wp++;
 456
 457                         esym = NULL;
 458
 459                         // Search for chunk containing location to fix up; compute a
 460                         // pointer to the location (in the chunk). Often we will find the
 461                         // fixup is in the "cached" chunk, so the linear-search is seldom
 462                         // executed.
 463                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 464                         {
 465                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 466                                 {
 467                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 468                                                 break;
 469                                 }
 470
 471                                 if (cch == NULL)
 472                                 {
 473                                         interror(7);                    // Fixup (loc) out of range
 474                                         // NOTREACHED
 475                                 }
 476                         }
 477
 478                         locp = cch->chptr + (loc - cch->chloc);
 479                         eattr = 0;
 480
 481                         // Compute expression/symbol value and attribs
 482                         // Complex expression
 483                         if (w & FU_EXPR)
 484                         {
 485                                 i = *fup.wp++;
 486
 487                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 488                                 {
 489                                         fup.lp += i;
 490                                         continue;
 491                                 }
 492
 493                                 fup.lp += i;
 494                         }
 495                         // Simple symbol
 496                         else
 497                         {
 498                                 sy = *fup.sy++;
 499                                 eattr = sy->sattr;
 500
 501                                 if (eattr & DEFINED)
 502                                         eval = sy->svalue;
 503                                 else
 504                                         eval = 0;
 505
 506                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 507                                         esym = sy;
 508                         }
 509
 510                         tdb = (WORD)(eattr & TDB);
 511
 512                         // If the expression is undefined and no external symbol is
 513                         // involved, then it's an error.
 514                         if (!(eattr & DEFINED) && esym == NULL)
 515                         {
 516                                 error(undef_error);
 517                                 continue;
 518                         }
 519
 520                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 521                                 esym->sattre |= RISCSYM;
 522
 523                         // Do the fixup
 524                         //
 525                         // If a PC-relative fixup is undefined, its value is *not*
 526                         // subtracted from the location (that will happen in the linker
 527                         // when the external reference is resolved).
 528                         //
 529                         // MWC expects PC-relative things to have the LOC subtracted from
 530                         // the value, if the value is external (that is, undefined at this
 531                         // point).
 532                         //
 533                         // PC-relative fixups must be DEFINED and either in the same
 534                         // section (whereupon the subtraction takes place) or ABS (with no
 535                         // subtract).
 536                         if (w & FU_PCREL)
 537                         {
 538                                 if (eattr & DEFINED)
 539                                 {
 540                                         if (tdb == sno)
 541                                                 eval -= (VALUE)loc;
 542                                         else if (tdb)
 543                                         {
 544                                                 error("PC-relative expr across sections");
 545                                                 continue;
 546                                         }
 547
 548                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 549                                                 warn("unoptimized short branch");
 550                                 }
 551                                 else if (obj_format == MWC)
 552                                         eval -= (VALUE)loc;
 553
 554                                 tdb = 0;
 555                                 eattr &= ~TDB;
 556                         }
 557
 558                         // Do fixup classes
 559                         switch ((int)(w & FUMASK))
 560                         {
 561                         // FU_BBRA fixes up a one-byte branch offset.
 562                         case FU_BBRA:
 563                                 if (!(eattr & DEFINED))
 564                                 {
 565                                         error("external short branch");
 566                                         continue;
 567                                 }
 568
 569                                 eval -= 2;
 570
 571                                 if (eval + 0x80 >= 0x100)
 572                                         goto range;
 573
 574                                 if (eval == 0)
 575                                 {
 576                                         error("illegal bra.s with zero offset");
 577                                         continue;
 578                                 }
 579
 580                                 *++locp = (char)eval;
 581                                 break;
 582                         // Fixup one-byte value at locp + 1.
 583                         case FU_WBYTE:
 584                                 ++locp;
 585                                 // FALLTHROUGH
 586                         // Fixup one-byte forward references
 587                         case FU_BYTE:
 588                                 if (!(eattr & DEFINED))
 589                                 {
 590                                         error("external byte reference");
 591                                         continue;
 592                                 }
 593
 594                                 if (tdb)
 595                                 {
 596                                         error("non-absolute byte reference");
 597                                         continue;
 598                                 }
 599
 600                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 601                                         goto range;
 602
 603                                 if (w & FU_SEXT)
 604                                 {
 605                                         if (eval + 0x100 >= 0x200)
 606                                                 goto range;
 607                                 }
 608                                 else if (eval >= 0x100)
 609                                         goto range;
 610
 611                                 *locp = (char)eval;
 612                                 break;
 613                         // Fixup WORD forward references;
 614                         // the word could be unaligned in the section buffer, so we have to
 615                         // be careful.
 616                         case FU_WORD:
 617                                 if (((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR))
 618                                 {
 619                                         oaddr = *fup.lp++;
 620
 621                                         if (oaddr)
 622                                         {
 623                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 624                                         }
 625                                         else
 626                                         {
 627                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 628                                         }
 629
 630                                         if ((w & 0x0F00) == FU_MJR)
 631                                         {
 632                                                 // Main code destination alignment checking here for
 633                                                 // forward declared labels
 634                                                 address = (oaddr) ? oaddr : loc;
 635
 636                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 637                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 638                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 639                                                 {
 640                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 641                                                                 "main memory and local gpu ram", address);
 642                                                 }
 643                                                 else
 644                                                 {
 645                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 646
 647                                                         if (page_jump)
 648                                                         {
 649                                                                 // This jump is to a page outside of the
 650                                                                 // current 256 byte page
 651                                                                 if (eval % 4)
 652                                                                 {
 653                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 654                                                                 }
 655                                                         }
 656                                                         else
 657                                                         {
 658                                                                 // This jump is in the current 256 byte page
 659                                                                 if ((eval - 2) % 4)
 660                                                                 {
 661                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 662                                                                 }
 663                                                         }
 664                                                 }
 665                                         }
 666
 667                                         if ((reg2 < -16) || (reg2 > 15))
 668                                         {
 669                                                 error("relative jump out of range");
 670                                                 break;
 671                                         }
 672
 673                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 674                                         locp++;
 675                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 676                                         break;
 677                                 }
 678
 679                                 if ((w & 0x0F00) == FU_NUM15)
 680                                 {
 681                                         if (eval < -16 || eval > 15)
 682                                         {
 683                                                 error("constant out of range");
 684                                                 break;
 685                                         }
 686
 687                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 688                                         locp++;
 689                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 690                                         break;
 691                                 }
 692
 693                                 if ((w & 0x0F00) == FU_NUM31)
 694                                 {
 695                                         if (eval < 0 || eval > 31)
 696                                         {
 697                                                 error("constant out of range");
 698                                                 break;
 699                                         }
 700
 701                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 702                                         locp++;
 703                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 704                                         break;
 705                                 }
 706
 707                                 if ((w & 0x0F00) == FU_NUM32)
 708                                 {
 709                                         if (eval < 1 || eval > 32)
 710                                         {
 711                                                 error("constant out of range");
 712                                                 break;
 713                                         }
 714
 715                                         if (w & FU_SUB32)
 716                                                 eval = (32 - eval);
 717
 718                                         eval = (eval == 32) ? 0 : eval;
 719                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 720                                         locp++;
 721                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 722                                         break;
 723                                 }
 724
 725                                 if ((w & 0x0F00) == FU_REGONE)
 726                                 {
 727                                         if (eval < 0 || eval > 31)
 728                                         {
 729                                                 error("register value out of range");
 730                                                 break;
 731                                         }
 732
 733                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 734                                         locp++;
 735                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 736                                         break;
 737                                 }
 738
 739                                 if ((w & 0x0F00) == FU_REGTWO)
 740                                 {
 741                                         if (eval < 0 || eval > 31)
 742                                         {
 743                                                 error("register value out of range");
 744                                                 break;
 745                                         }
 746
 747                                         locp++;
 748                                         *locp = (char)(*locp | (eval & 0x1F));
 749                                         break;
 750                                 }
 751
 752                                 if (!(eattr & DEFINED))
 753                                 {
 754                                         if (w & FU_PCREL)
 755                                                 w = MPCREL | MWORD;
 756                                         else
 757                                                 w = MWORD;
 758
 759                                         rmark(sno, loc, 0, w, esym);
 760                                 }
 761                                 else
 762                                 {
 763                                         if (tdb)
 764                                                 rmark(sno, loc, tdb, MWORD, NULL);
 765
 766                                         if (w & FU_SEXT)
 767                                         {
 768                                                 if (eval + 0x10000 >= 0x20000)
 769                                                         goto range;
 770                                         }
 771                                         else
 772                                         {
 773                                                 // Range-check BRA and DBRA
 774                                                 if (w & FU_ISBRA)
 775                                                 {
 776                                                         if (eval + 0x8000 >= 0x10000)
 777                                                         goto range;
 778                                                 }
 779                                                 else if (eval >= 0x10000)
 780                                                         goto range;
 781                                         }
 782                                 }
 783
 784                                 *locp++ = (char)(eval >> 8);
 785                                 *locp = (char)eval;
 786                                 break;
 787                         // Fixup LONG forward references;
 788                         // the long could be unaligned in the section buffer, so be careful
 789                         // (again).
 790                         case FU_LONG:
 791                                 if ((w & 0x0F00) == FU_MOVEI)
 792                                 {
 793                                         address = loc + 4;
 794
 795                                         if (eattr & DEFINED)
 796                                         {
 797                                                 for(j=0; j<fwindex; j++)
 798                                                 {
 799                                                         if (fwdjump[j] == address)
 800                                                         {
 801                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 802
 803                                                                 if (page_jump)
 804                                                                 {
 805                                                                         if (eval % 4)
 806                                                                         {
 807                                                                                 err_setup();
 808                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 809
 810                                                                                 if (listing > 0)
 811                                                                                         ship_ln(buf);
 812
 813                                                                                 if (err_flag)
 814                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 815                                                                                 else
 816                                                                                         printf("%s\n", buf);
 817                                                                         }
 818                                                                 }
 819                                                                 else
 820                                                                 {
 821                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 822                                                                         {
 823                                                                                 err_setup();
 824                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 825
 826                                                                                 if (listing > 0)
 827                                                                                         ship_ln(buf);
 828
 829                                                                                 if (err_flag)
 830                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 831                                                                                 else
 832                                                                                         printf("%s\n", buf);
 833                                                                         }
 834                                                                 }
 835
 836                                                                 // Clear this jump as it has been checked
 837                                                                 fwdjump[j] = 0;
 838                                                                 j = fwindex;
 839                                                         }
 840                                                 }
 841                                         }
 842
 843                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 844                                         flags = (MLONG|MMOVEI);
 845                                 }
 846                                 else
 847                                         flags = MLONG;
 848
 849                                 if (!(eattr & DEFINED))
 850                                 {
 851                                         rmark(sno, loc, 0, flags, esym);
 852                                 }
 853                                 else if (tdb)
 854                                 {
 855                                         rmark(sno, loc, tdb, flags, NULL);
 856                                 }
 857
 858                                 *locp++ = (char)(eval >> 24);
 859                                 *locp++ = (char)(eval >> 16);
 860                                 *locp++ = (char)(eval >> 8);
 861                                 *locp = (char)eval;
 862                                 break;
 863                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 864                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 865                         case FU_QUICK:
 866                                 if (!(eattr & DEFINED))
 867                                 {
 868                                         error("External quick reference");
 869                                         continue;
 870                                 }
 871
 872                                 if (eval < 1 || eval > 8)
 873                                         goto range;
 874
 875                                 *locp |= (eval & 7) << 1;
 876                                 break;
 877                         // Fix up 6502 funny branch
 878                         case FU_6BRA:
 879                                 eval -= (loc + 1);
 880
 881                                 if (eval + 0x80 >= 0x100)
 882                                         goto range;
 883
 884                                 *locp = (char)eval;
 885                                 break;
 886                         default:
 887                                 interror(4);                                 // Bad fixup type
 888                                 // NOTREACHED
 889                         }
 890                         continue;
 891 range:
 892                         error("expression out of range");
 893                 }
 894
 895                 ch = ch->chnext;
 896         }
 897         while (ch != NULL);
 898
 899         return 0;
 900 }