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
  21 // Section descriptors
  22 SECT sect[NSECTS];                              // All sections...
  23 int cursect;                                    // Current section number
  24
  25 // These are copied from the section descriptor, the current code chunk
  26 // descriptor and the current fixup chunk descriptor when a switch is made into
  27 // a section.  They are copied back to the descriptors when the section is left.
  28 WORD scattr;                                    // Section attributes
  29 LONG sloc;                                              // Current loc in section
  30
  31 CHUNK * scode;                                  // Current (last) code chunk
  32 LONG challoc;                                   // # bytes alloc'd to code chunk
  33 LONG ch_size;                                   // # bytes used in code chunk
  34 char * chptr;                                   // Deposit point in code chunk buffer
  35
  36 CHUNK * sfix;                                   // Current (last) fixup chunk
  37 LONG fchalloc;                                  // # bytes alloc'd to fixup chunk
  38 LONG fchsize;                                   // # bytes used in fixup chunk
  39 PTR fchptr;                                             // Deposit point in fixup chunk buffer
  40
  41 unsigned fwdjump[MAXFWDJUMPS];  // forward jump check table
  42 unsigned fwindex = 0;                   // forward jump index
  43
  44 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  45 // associated with a location.
  46 static char fusiztab[] = {
  47    0,   // FU_QUICK
  48    1,   // FU_BYTE
  49    2,   // FU_WORD
  50    2,   // FU_WBYTE
  51    4,   // FU_LONG
  52    1,   // FU_BBRA
  53    0,   // (unused)
  54    1,   // FU_6BRA
  55 };
  56
  57 // Offset to REAL fixup location
  58 static char fusizoffs[] = {
  59    0,   // FU_QUICK
  60    0,   // FU_BYTE
  61    0,   // FU_WORD
  62    1,   // FU_WBYTE
  63    0,   // FU_LONG
  64    1,   // FU_BBRA
  65    0,   // (unused)
  66    0,   // FU_6BRA
  67 };
  68
  69
  70 //
  71 // Make a New (Clean) Section
  72 //
  73 void mksect(int sno, WORD attr)
  74 {
  75         SECT * 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         CHUNK * cp;                                                             // Chunk pointer
  90         cursect = sno;
  91         SECT * p = &sect[sno];
  92
  93         scattr = p->scattr;                                             // Copy section vars
  94         sloc = p->sloc;
  95         scode = p->scode;
  96         sfix = p->sfix;
  97
  98         // Copy code chunk vars
  99         if ((cp = scode) != NULL)
 100         {
 101                 challoc = cp->challoc;
 102                 ch_size = cp->ch_size;
 103                 chptr = cp->chptr + ch_size;
 104         }
 105         else
 106                 challoc = ch_size = 0;
 107
 108         // Copy fixup chunk vars
 109         if ((cp = sfix) != NULL)
 110         {
 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;
 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
 176         // listing, which is SLOW.
 177         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 178         {
 179                 fup.cp = (char *)ch->chptr;
 180                 fuend = fup.cp + ch->ch_size;
 181
 182                 while (fup.cp < fuend)
 183                 {
 184                         w = *fup.wp++;
 185                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 186                         fup.wp += 2;
 187
 188                         if (xloc == loc)
 189                                 return (int)fusiztab[w & FUMASK];
 190
 191                         if (w & FU_EXPR)
 192                         {
 193                                 w = *fup.wp++;
 194                                 fup.lp += w;
 195                         }
 196                         else
 197                                 ++fup.lp;
 198                 }
 199         }
 200
 201         return 0;
 202 }
 203
 204
 205 //
 206 // Check that there are at least `amt' bytes left in the current chunk. If
 207 // there are not, allocate another chunk of at least `amt' bytes (and probably
 208 // more).
 209 //
 210 // If `amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 211 //
 212 int chcheck(LONG amt)
 213 {
 214         DEBUG { printf("chcheck(%u)\n", amt); }
 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         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
 223         if ((int)(challoc - ch_size) >= (int)amt)
 224                 return 0;
 225
 226         if (amt < CH_CODE_SIZE)
 227                 amt = CH_CODE_SIZE;
 228
 229         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 230         SECT * p = &sect[cursect];
 231         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 232
 233         // First chunk in section
 234         if (scode == NULL)
 235         {
 236                 cp->chprev = NULL;
 237                 p->sfcode = cp;
 238         }
 239         // Add chunk to other chunks
 240         else
 241         {
 242                 cp->chprev = scode;
 243                 scode->chnext = cp;
 244                 scode->ch_size = ch_size;                       // Save old chunk's globals
 245         }
 246
 247         // Setup chunk and global vars
 248         cp->chloc = sloc;
 249         cp->chnext = NULL;
 250         challoc = cp->challoc = amt;
 251         ch_size = cp->ch_size = 0;
 252         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 253         scode = p->scode = cp;
 254
 255         return 0;
 256 }
 257
 258
 259 // This is really wrong. We need to make some proper structures here so we don't
 260 // have to count sizes of objects, that's what the compiler's for! :-P
 261 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
 262 //
 263 // Arrange for a fixup on a location
 264 //
 265 int fixup(WORD attr, LONG loc, TOKEN * fexpr)
 266 {
 267         LONG i;
 268         LONG len = 0;
 269         CHUNK * cp;
 270         SECT * p;
 271         // Shamus: Expression lengths are voodoo ATM (varibale "i"). Need to fix this.
 272         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 273
 274         // Compute length of expression (could be faster); determine if it's the
 275         // single-symbol case; no expression if it's just a mark. This code assumes
 276         // 16 bit WORDs and 32 bit LONGs
 277         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 278         {
 279                 // Just a single symbol
 280                 // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 281                 if ((attr & 0x0F00) == FU_JR)
 282                 {
 283 //                      i = 18;
 284 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 285                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 286                 }
 287                 else
 288                 {
 289 //                      i = 14;
 290                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 291                 }
 292         }
 293         else
 294         {
 295                 attr |= FU_EXPR;
 296
 297                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 298                 {
 299                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 300                                 len++;
 301                 }
 302
 303                 len++;                                                          // Add 1 for ENDEXPR
 304 //              i = (len << 2) + 12;
 305                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 306         }
 307
 308         // Maybe alloc another fixup chunk for this one to fit in
 309         if ((fchalloc - fchsize) < i)
 310         {
 311                 p = &sect[cursect];
 312                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 313
 314                 // First fixup chunk in section
 315                 if (sfix == NULL)
 316                 {
 317                         cp->chprev = NULL;
 318                         p->sffix = cp;
 319                 }
 320                 // Add to other chunks
 321                 else
 322                 {
 323                         cp->chprev = sfix;
 324                         sfix->chnext = cp;
 325                         sfix->ch_size = fchsize;
 326                 }
 327
 328                 // Setup fixup chunk and its global vars
 329                 cp->chnext = NULL;
 330                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 331                 fchsize = cp->ch_size = 0;
 332                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 333                 sfix = p->sfix = cp;
 334         }
 335
 336         // Record fixup type, fixup location, and the file number and line number
 337         // the fixup is located at.
 338         *fchptr.wp++ = attr;
 339         *fchptr.lp++ = loc;
 340         *fchptr.wp++ = cfileno;
 341         *fchptr.wp++ = (WORD)curlineno;
 342
 343         // Store postfix expression or pointer to a single symbol, or nothing for a
 344         // mark.
 345         if (attr & FU_EXPR)
 346         {
 347                 *fchptr.wp++ = (WORD)len;
 348
 349                 while (len--)
 350                         *fchptr.lp++ = (LONG)*fexpr++;
 351         }
 352         else
 353         {
 354 //              *fchptr.lp++ = (LONG)fexpr[1];
 355                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 356         }
 357
 358         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 359         if ((attr & 0x0F00) == FU_JR)
 360         {
 361                 if (orgactive)
 362                         *fchptr.lp++ = orgaddr;
 363                 else
 364                         *fchptr.lp++ = 0x00000000;
 365         }
 366
 367         fchsize += i;
 368         return 0;
 369 }
 370
 371
 372 //
 373 // Resolve all Fixups
 374 //
 375 int ResolveAllFixups(void)
 376 {
 377         unsigned i;
 378         char buf[EBUFSIZ];
 379
 380         // Make undefined symbols GLOBL
 381         if (glob_flag)
 382                 syg_fix();
 383
 384         DEBUG printf("Resolving TEXT sections...\n");
 385         ResolveFixups(TEXT);
 386         DEBUG printf("Resolving DATA sections...\n");
 387         ResolveFixups(DATA);
 388
 389         // We need to do a final check of forward 'jump' destination addresses that
 390         // are external
 391         for(i=0; i<MAXFWDJUMPS; i++)
 392         {
 393                 if (fwdjump[i])
 394                 {
 395                         err_setup();
 396                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 397
 398                         if (listing > 0)
 399                                 ship_ln(buf);
 400
 401                         if (err_flag)
 402                                 write(err_fd, buf, (LONG)strlen(buf));
 403                         else
 404                                 printf("%s\n", buf);
 405                 }
 406         }
 407
 408         return 0;
 409 }
 410
 411
 412 //
 413 // Resolve Fixups in a Section
 414 //
 415 int ResolveFixups(int sno)
 416 {
 417         PTR fup;                                        // Current fixup
 418         WORD * fuend;                           // End of last fixup (in this chunk)
 419         WORD w;                                         // Fixup word (type+modes+flags)
 420         char * locp;                            // Location to fix (in cached chunk)
 421         LONG loc;                                       // Location to fixup
 422         VALUE eval;                                     // Expression value
 423         WORD eattr;                                     // Expression attrib
 424         SYM * esym;                                     // External symbol involved in expr
 425         SYM * sy;                                       // (Temp) pointer to a symbol
 426         WORD i;                                         // (Temp) word
 427         WORD tdb;                                       // eattr & TDB
 428         LONG oaddr;
 429         int reg2;
 430         WORD flags;
 431         unsigned page_jump = 0;
 432         unsigned address = 0;
 433         unsigned j;
 434         char buf[EBUFSIZ];
 435
 436         SECT * sc = &sect[sno];
 437         CHUNK * ch = sc->sffix;
 438
 439         if (ch == NULL)
 440                 return 0;
 441
 442         CHUNK * cch = sc->sfcode;                               // "cache" first chunk
 443
 444         if (cch == NULL)                                                // Can't fixup a sect with nothing in it
 445                 return 0;
 446
 447         do
 448         {
 449                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 450                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 451
 452                 while (fup.wp < fuend)
 453                 {
 454                         w = *fup.wp++;
 455                         loc = *fup.lp++;
 456                         cfileno = *fup.wp++;
 457                         curlineno = (int)*fup.wp++;
 458 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 459                         // This is based on global vars cfileno, curfname :-P
 460                         // This approach is kinda meh as well. I think we can do better than this.
 461                         SetFilenameForErrorReporting();
 462
 463                         esym = NULL;
 464
 465                         // Search for chunk containing location to fix up; compute a
 466                         // pointer to the location (in the chunk). Often we will find the
 467                         // fixup is in the "cached" chunk, so the linear-search is seldom
 468                         // executed.
 469                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 470                         {
 471                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 472                                 {
 473                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 474                                                 break;
 475                                 }
 476
 477                                 if (cch == NULL)
 478                                 {
 479                                         interror(7);                    // Fixup (loc) out of range
 480                                         // NOTREACHED
 481                                 }
 482                         }
 483
 484                         locp = cch->chptr + (loc - cch->chloc);
 485                         eattr = 0;
 486
 487                         // Compute expression/symbol value and attribs
 488                         // Complex expression
 489                         if (w & FU_EXPR)
 490                         {
 491                                 i = *fup.wp++;
 492
 493                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 494                                 {
 495                                         fup.lp += i;
 496                                         continue;
 497                                 }
 498
 499                                 fup.lp += i;
 500                         }
 501                         // Simple symbol
 502                         else
 503                         {
 504                                 sy = *fup.sy++;
 505                                 eattr = sy->sattr;
 506
 507                                 if (eattr & DEFINED)
 508                                         eval = sy->svalue;
 509                                 else
 510                                         eval = 0;
 511
 512                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 513                                         esym = sy;
 514                         }
 515
 516                         tdb = (WORD)(eattr & TDB);
 517
 518                         // If the expression is undefined and no external symbol is
 519                         // involved, then it's an error.
 520                         if (!(eattr & DEFINED) && esym == NULL)
 521                         {
 522                                 error(undef_error);
 523                                 continue;
 524                         }
 525
 526                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 527                                 esym->sattre |= RISCSYM;
 528
 529                         // Do the fixup
 530                         //
 531                         // If a PC-relative fixup is undefined, its value is *not*
 532                         // subtracted from the location (that will happen in the linker
 533                         // when the external reference is resolved).
 534                         //
 535                         // MWC expects PC-relative things to have the LOC subtracted from
 536                         // the value, if the value is external (that is, undefined at this
 537                         // point).
 538                         //
 539                         // PC-relative fixups must be DEFINED and either in the same
 540                         // section (whereupon the subtraction takes place) or ABS (with no
 541                         // subtract).
 542                         if (w & FU_PCREL)
 543                         {
 544                                 if (eattr & DEFINED)
 545                                 {
 546                                         if (tdb == sno)
 547                                                 eval -= (VALUE)loc;
 548                                         else if (tdb)
 549                                         {
 550                                                 error("PC-relative expr across sections");
 551                                                 continue;
 552                                         }
 553
 554                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 555                                                 warn("unoptimized short branch");
 556                                 }
 557                                 else if (obj_format == MWC)
 558                                         eval -= (VALUE)loc;
 559
 560                                 tdb = 0;
 561                                 eattr &= ~TDB;
 562                         }
 563
 564                         // Do fixup classes
 565                         switch ((int)(w & FUMASK))
 566                         {
 567                         // FU_BBRA fixes up a one-byte branch offset.
 568                         case FU_BBRA:
 569                                 if (!(eattr & DEFINED))
 570                                 {
 571                                         error("external short branch");
 572                                         continue;
 573                                 }
 574
 575                                 eval -= 2;
 576
 577                                 if (eval + 0x80 >= 0x100)
 578                                         goto range;
 579
 580                                 if (eval == 0)
 581                                 {
 582                                         error("illegal bra.s with zero offset");
 583                                         continue;
 584                                 }
 585
 586                                 *++locp = (char)eval;
 587                                 break;
 588                         // Fixup one-byte value at locp + 1.
 589                         case FU_WBYTE:
 590                                 ++locp;
 591                                 // FALLTHROUGH
 592                         // Fixup one-byte forward references
 593                         case FU_BYTE:
 594                                 if (!(eattr & DEFINED))
 595                                 {
 596                                         error("external byte reference");
 597                                         continue;
 598                                 }
 599
 600                                 if (tdb)
 601                                 {
 602                                         error("non-absolute byte reference");
 603                                         continue;
 604                                 }
 605
 606                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 607                                         goto range;
 608
 609                                 if (w & FU_SEXT)
 610                                 {
 611                                         if (eval + 0x100 >= 0x200)
 612                                                 goto range;
 613                                 }
 614                                 else if (eval >= 0x100)
 615                                         goto range;
 616
 617                                 *locp = (char)eval;
 618                                 break;
 619                         // Fixup WORD forward references;
 620                         // the word could be unaligned in the section buffer, so we have to
 621                         // be careful.
 622                         case FU_WORD:
 623                                 if (((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR))
 624                                 {
 625                                         oaddr = *fup.lp++;
 626
 627                                         if (oaddr)
 628                                         {
 629                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 630                                         }
 631                                         else
 632                                         {
 633                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 634                                         }
 635
 636                                         if ((w & 0x0F00) == FU_MJR)
 637                                         {
 638                                                 // Main code destination alignment checking here for
 639                                                 // forward declared labels
 640                                                 address = (oaddr) ? oaddr : loc;
 641
 642                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 643                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 644                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 645                                                 {
 646                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 647                                                                 "main memory and local gpu ram", address);
 648                                                 }
 649                                                 else
 650                                                 {
 651                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 652
 653                                                         if (page_jump)
 654                                                         {
 655                                                                 // This jump is to a page outside of the
 656                                                                 // current 256 byte page
 657                                                                 if (eval % 4)
 658                                                                 {
 659                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 660                                                                 }
 661                                                         }
 662                                                         else
 663                                                         {
 664                                                                 // This jump is in the current 256 byte page
 665                                                                 if ((eval - 2) % 4)
 666                                                                 {
 667                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 668                                                                 }
 669                                                         }
 670                                                 }
 671                                         }
 672
 673                                         if ((reg2 < -16) || (reg2 > 15))
 674                                         {
 675                                                 error("relative jump out of range");
 676                                                 break;
 677                                         }
 678
 679                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 680                                         locp++;
 681                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 682                                         break;
 683                                 }
 684
 685                                 if ((w & 0x0F00) == FU_NUM15)
 686                                 {
 687                                         if (eval < -16 || eval > 15)
 688                                         {
 689                                                 error("constant out of range");
 690                                                 break;
 691                                         }
 692
 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_NUM31)
 700                                 {
 701                                         if (eval < 0 || eval > 31)
 702                                         {
 703                                                 error("constant 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_NUM32)
 714                                 {
 715                                         if (eval < 1 || eval > 32)
 716                                         {
 717                                                 error("constant out of range");
 718                                                 break;
 719                                         }
 720
 721                                         if (w & FU_SUB32)
 722                                                 eval = (32 - eval);
 723
 724                                         eval = (eval == 32) ? 0 : eval;
 725                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 726                                         locp++;
 727                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 728                                         break;
 729                                 }
 730
 731                                 if ((w & 0x0F00) == FU_REGONE)
 732                                 {
 733                                         if (eval < 0 || eval > 31)
 734                                         {
 735                                                 error("register value out of range");
 736                                                 break;
 737                                         }
 738
 739                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 740                                         locp++;
 741                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 742                                         break;
 743                                 }
 744
 745                                 if ((w & 0x0F00) == FU_REGTWO)
 746                                 {
 747                                         if (eval < 0 || eval > 31)
 748                                         {
 749                                                 error("register value out of range");
 750                                                 break;
 751                                         }
 752
 753                                         locp++;
 754                                         *locp = (char)(*locp | (eval & 0x1F));
 755                                         break;
 756                                 }
 757
 758                                 if (!(eattr & DEFINED))
 759                                 {
 760                                         if (w & FU_PCREL)
 761                                                 w = MPCREL | MWORD;
 762                                         else
 763                                                 w = MWORD;
 764
 765                                         rmark(sno, loc, 0, w, esym);
 766                                 }
 767                                 else
 768                                 {
 769                                         if (tdb)
 770                                                 rmark(sno, loc, tdb, MWORD, NULL);
 771
 772                                         if (w & FU_SEXT)
 773                                         {
 774                                                 if (eval + 0x10000 >= 0x20000)
 775                                                         goto range;
 776                                         }
 777                                         else
 778                                         {
 779                                                 // Range-check BRA and DBRA
 780                                                 if (w & FU_ISBRA)
 781                                                 {
 782                                                         if (eval + 0x8000 >= 0x10000)
 783                                                         goto range;
 784                                                 }
 785                                                 else if (eval >= 0x10000)
 786                                                         goto range;
 787                                         }
 788                                 }
 789
 790                                 *locp++ = (char)(eval >> 8);
 791                                 *locp = (char)eval;
 792                                 break;
 793                         // Fixup LONG forward references;
 794                         // the long could be unaligned in the section buffer, so be careful
 795                         // (again).
 796                         case FU_LONG:
 797                                 if ((w & 0x0F00) == FU_MOVEI)
 798                                 {
 799                                         address = loc + 4;
 800
 801                                         if (eattr & DEFINED)
 802                                         {
 803                                                 for(j=0; j<fwindex; j++)
 804                                                 {
 805                                                         if (fwdjump[j] == address)
 806                                                         {
 807                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 808
 809                                                                 if (page_jump)
 810                                                                 {
 811                                                                         if (eval % 4)
 812                                                                         {
 813                                                                                 err_setup();
 814                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 815
 816                                                                                 if (listing > 0)
 817                                                                                         ship_ln(buf);
 818
 819                                                                                 if (err_flag)
 820                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 821                                                                                 else
 822                                                                                         printf("%s\n", buf);
 823                                                                         }
 824                                                                 }
 825                                                                 else
 826                                                                 {
 827                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 828                                                                         {
 829                                                                                 err_setup();
 830                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 831
 832                                                                                 if (listing > 0)
 833                                                                                         ship_ln(buf);
 834
 835                                                                                 if (err_flag)
 836                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 837                                                                                 else
 838                                                                                         printf("%s\n", buf);
 839                                                                         }
 840                                                                 }
 841
 842                                                                 // Clear this jump as it has been checked
 843                                                                 fwdjump[j] = 0;
 844                                                                 j = fwindex;
 845                                                         }
 846                                                 }
 847                                         }
 848
 849                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 850                                         flags = (MLONG|MMOVEI);
 851                                 }
 852                                 else
 853                                         flags = MLONG;
 854
 855                                 if (!(eattr & DEFINED))
 856                                 {
 857                                         rmark(sno, loc, 0, flags, esym);
 858                                 }
 859                                 else if (tdb)
 860                                 {
 861                                         rmark(sno, loc, tdb, flags, NULL);
 862                                 }
 863
 864                                 *locp++ = (char)(eval >> 24);
 865                                 *locp++ = (char)(eval >> 16);
 866                                 *locp++ = (char)(eval >> 8);
 867                                 *locp = (char)eval;
 868                                 break;
 869                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 870                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 871                         case FU_QUICK:
 872                                 if (!(eattr & DEFINED))
 873                                 {
 874                                         error("External quick reference");
 875                                         continue;
 876                                 }
 877
 878                                 if (eval < 1 || eval > 8)
 879                                         goto range;
 880
 881                                 *locp |= (eval & 7) << 1;
 882                                 break;
 883                         // Fix up 6502 funny branch
 884                         case FU_6BRA:
 885                                 eval -= (loc + 1);
 886
 887                                 if (eval + 0x80 >= 0x100)
 888                                         goto range;
 889
 890                                 *locp = (char)eval;
 891                                 break;
 892                         default:
 893                                 interror(4);                                 // Bad fixup type
 894                                 // NOTREACHED
 895                         }
 896                         continue;
 897 range:
 898                         error("expression out of range");
 899                 }
 900
 901                 ch = ch->chnext;
 902         }
 903         while (ch != NULL);
 904
 905         return 0;
 906 }