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

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // SECT.C - Code Generation, Fixups and Section Management
   4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source Utilised with the Kind Permission of Landon Dyer
   7 //
   8
   9 #include "sect.h"
  10 #include "direct.h"
  11 #include "error.h"
  12 #include "expr.h"
  13 #include "listing.h"
  14 #include "mach.h"
  15 #include "mark.h"
  16 #include "riscasm.h"
  17 #include "symbol.h"
  18 #include "token.h"
  19
  20
  21 // Function prototypes
  22 void mksect(int, WORD);
  23 void switchsect(int);
  24
  25 // Section descriptors
  26 SECT sect[NSECTS];                              // All sections...
  27 int cursect;                                    // Current section number
  28
  29 // These are copied from the section descriptor, the current code chunk
  30 // descriptor and the current fixup chunk descriptor when a switch is made into
  31 // a section.  They are copied back to the descriptors when the section is left.
  32 WORD scattr;                                    // Section attributes
  33 LONG sloc;                                              // Current loc in section
  34
  35 CHUNK * scode;                                  // Current (last) code chunk
  36 LONG challoc;                                   // # bytes alloc'd to code chunk
  37 LONG ch_size;                                   // # bytes used in code chunk
  38 char * chptr;                                   // Deposit point in code chunk buffer
  39
  40 CHUNK * sfix;                                   // Current (last) fixup chunk
  41 LONG fchalloc;                                  // # bytes alloc'd to fixup chunk
  42 LONG fchsize;                                   // # bytes used in fixup chunk
  43 PTR fchptr;                                             // Deposit point in fixup chunk buffer
  44
  45 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  46 // associated with a location.
  47 static char fusiztab[] = {
  48    0,   // FU_QUICK
  49    1,   // FU_BYTE
  50    2,   // FU_WORD
  51    2,   // FU_WBYTE
  52    4,   // FU_LONG
  53    1,   // FU_BBRA
  54    0,   // (unused)
  55    1,   // FU_6BRA
  56 };
  57
  58 // Offset to REAL fixup location
  59 static char fusizoffs[] = {
  60    0,   // FU_QUICK
  61    0,   // FU_BYTE
  62    0,   // FU_WORD
  63    1,   // FU_WBYTE
  64    0,   // FU_LONG
  65    1,   // FU_BBRA
  66    0,   // (unused)
  67    0,   // FU_6BRA
  68 };
  69
  70
  71 //
  72 // Initialize Sections; Setup initial ABS, TEXT, DATA and BSS sections
  73 //
  74 void InitSection(void)
  75 {
  76         int i;
  77
  78         // Cleanup all sections
  79         for(i=0; i<NSECTS; i++)
  80                 mksect(i, 0);
  81
  82         // Construct default sections, make TEXT the current section
  83         mksect(ABS,   SUSED | SABS | SBSS);             // ABS
  84         mksect(TEXT,  SUSED | TEXT       );             // TEXT
  85         mksect(DATA,  SUSED | DATA       );             // DATA
  86         mksect(BSS,   SUSED | BSS | SBSS );             // BSS
  87 //      mksect(M6502, SUSED | TEXT       );             // 6502 code section
  88
  89         switchsect(TEXT);                                               // Switch to TEXT for starters
  90 }
  91
  92
  93 //
  94 // Make a New (Clean) Section
  95 //
  96 void mksect(int sno, WORD attr)
  97 {
  98         SECT * p = &sect[sno];
  99         p->scattr = attr;
 100         p->sloc = 0;
 101         p->scode = p->sfcode = NULL;
 102         p->sfix = p->sffix = NULL;
 103 }
 104
 105
 106 //
 107 // Switch to Another Section (Copy Section & Chunk Descriptors to Global Vars
 108 // for Fast Access)
 109 //
 110 void switchsect(int sno)
 111 {
 112         CHUNK * cp;                                                             // Chunk pointer
 113         cursect = sno;
 114         SECT * p = &sect[sno];
 115
 116         scattr = p->scattr;                                             // Copy section vars
 117         sloc = p->sloc;
 118         scode = p->scode;
 119         sfix = p->sfix;
 120
 121         // Copy code chunk vars
 122         if ((cp = scode) != NULL)
 123         {
 124                 challoc = cp->challoc;
 125                 ch_size = cp->ch_size;
 126                 chptr = cp->chptr + ch_size;
 127         }
 128         else
 129                 challoc = ch_size = 0;
 130
 131         // Copy fixup chunk vars
 132         if ((cp = sfix) != NULL)
 133         {
 134                 fchalloc = cp->challoc;
 135                 fchsize = cp->ch_size;
 136                 fchptr.cp = cp->chptr + fchsize;
 137         }
 138         else
 139                 fchalloc = fchsize = 0;
 140 }
 141
 142
 143 //
 144 // Save Current Section
 145 //
 146 void savsect(void)
 147 {
 148         SECT * p = &sect[cursect];
 149
 150         p->scattr = scattr;                                             // Bailout section vars
 151         p->sloc = sloc;
 152
 153         if (scode != NULL)                                              // Bailout code chunk
 154                 scode->ch_size = ch_size;
 155
 156         if (sfix != NULL)                                               // Bailout fixup chunk
 157                 sfix->ch_size = fchsize;
 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         DEBUG { printf("chcheck(%u)\n", amt); }
 216         // If in BSS section, no allocation required
 217         if (scattr & SBSS)
 218                 return 0;
 219
 220         if (!amt)
 221                 amt = CH_THRESHOLD;
 222
 223         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
 224         if ((int)(challoc - ch_size) >= (int)amt)
 225                 return 0;
 226
 227         if (amt < CH_CODE_SIZE)
 228                 amt = CH_CODE_SIZE;
 229
 230         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 231         SECT * p = &sect[cursect];
 232         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 233
 234         // First chunk in section
 235         if (scode == NULL)
 236         {
 237                 cp->chprev = NULL;
 238                 p->sfcode = cp;
 239         }
 240         // Add chunk to other chunks
 241         else
 242         {
 243                 cp->chprev = scode;
 244                 scode->chnext = cp;
 245                 scode->ch_size = ch_size;                       // Save old chunk's globals
 246         }
 247
 248         // Setup chunk and global vars
 249         cp->chloc = sloc;
 250         cp->chnext = NULL;
 251         challoc = cp->challoc = amt;
 252         ch_size = cp->ch_size = 0;
 253         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 254         scode = p->scode = cp;
 255
 256         return 0;
 257 }
 258
 259
 260 // This is really wrong. We need to make some proper structures here so we don't
 261 // have to count sizes of objects, that's what the compiler's for! :-P
 262 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
 263 //
 264 // Arrange for a fixup on a location
 265 //
 266 int fixup(WORD attr, LONG loc, TOKEN * fexpr)
 267 {
 268         LONG i;
 269         LONG len = 0;
 270         CHUNK * cp;
 271         SECT * p;
 272         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix this.
 273 #warning "!!! fixup() is filled with VOODOO !!!"
 274         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 275
 276         // Compute length of expression (could be faster); determine if it's the
 277         // single-symbol case; no expression if it's just a mark. This code assumes
 278         // 16 bit WORDs and 32 bit LONGs
 279         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 280         {
 281                 // Just a single symbol
 282                 // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 283                 if ((attr & 0x0F00) == FU_JR)
 284                 {
 285 //                      i = 18;
 286 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 287                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 288                 }
 289                 else
 290                 {
 291 //                      i = 14;
 292                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 293                 }
 294         }
 295         else
 296         {
 297                 attr |= FU_EXPR;
 298
 299                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 300                 {
 301                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 302                                 len++;
 303                 }
 304
 305                 len++;                                                          // Add 1 for ENDEXPR
 306 //              i = (len << 2) + 12;
 307                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 308         }
 309
 310         // Maybe alloc another fixup chunk for this one to fit in
 311         if ((fchalloc - fchsize) < i)
 312         {
 313                 p = &sect[cursect];
 314                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 315
 316                 // First fixup chunk in section
 317                 if (sfix == NULL)
 318                 {
 319                         cp->chprev = NULL;
 320                         p->sffix = cp;
 321                 }
 322                 // Add to other chunks
 323                 else
 324                 {
 325                         cp->chprev = sfix;
 326                         sfix->chnext = cp;
 327                         sfix->ch_size = fchsize;
 328                 }
 329
 330                 // Setup fixup chunk and its global vars
 331                 cp->chnext = NULL;
 332                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 333                 fchsize = cp->ch_size = 0;
 334                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 335                 sfix = p->sfix = cp;
 336         }
 337
 338         // Record fixup type, fixup location, and the file number and line number
 339         // the fixup is located at.
 340         *fchptr.wp++ = attr;
 341         *fchptr.lp++ = loc;
 342         *fchptr.wp++ = cfileno;
 343         *fchptr.wp++ = (WORD)curlineno;
 344
 345         // Store postfix expression or pointer to a single symbol, or nothing for a
 346         // mark.
 347         if (attr & FU_EXPR)
 348         {
 349                 *fchptr.wp++ = (WORD)len;
 350
 351                 while (len--)
 352                         *fchptr.lp++ = (LONG)*fexpr++;
 353         }
 354         else
 355         {
 356 //              *fchptr.lp++ = (LONG)fexpr[1];
 357                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 358         }
 359
 360         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 361         if ((attr & 0x0F00) == FU_JR)
 362         {
 363                 if (orgactive)
 364                         *fchptr.lp++ = orgaddr;
 365                 else
 366                         *fchptr.lp++ = 0x00000000;
 367         }
 368
 369         fchsize += i;
 370         return 0;
 371 }
 372
 373
 374 //
 375 // Resolve all Fixups
 376 //
 377 int ResolveAllFixups(void)
 378 {
 379         unsigned i;
 380         char buf[EBUFSIZ];
 381
 382         // Make undefined symbols GLOBL
 383         if (glob_flag)
 384                 syg_fix();
 385
 386         DEBUG printf("Resolving TEXT sections...\n");
 387         ResolveFixups(TEXT);
 388         DEBUG printf("Resolving DATA sections...\n");
 389         ResolveFixups(DATA);
 390
 391 //No, no we don't.
 392 #if 0
 393         // We need to do a final check of forward 'jump' destination addresses that
 394         // are external
 395         for(i=0; i<MAXFWDJUMPS; i++)
 396         {
 397                 if (fwdjump[i])
 398                 {
 399                         err_setup();
 400                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 401
 402                         if (listing > 0)
 403                                 ship_ln(buf);
 404
 405                         if (err_flag)
 406                                 write(err_fd, buf, (LONG)strlen(buf));
 407                         else
 408                                 printf("%s\n", buf);
 409                 }
 410         }
 411 #endif
 412
 413         return 0;
 414 }
 415
 416
 417 //
 418 // Resolve Fixups in a Section
 419 //
 420 int ResolveFixups(int sno)
 421 {
 422         PTR fup;                                        // Current fixup
 423         WORD * fuend;                           // End of last fixup (in this chunk)
 424         WORD w;                                         // Fixup word (type+modes+flags)
 425         char * locp;                            // Location to fix (in cached chunk)
 426         LONG loc;                                       // Location to fixup
 427         VALUE eval;                                     // Expression value
 428         WORD eattr;                                     // Expression attrib
 429         SYM * esym;                                     // External symbol involved in expr
 430         SYM * sy;                                       // (Temp) pointer to a symbol
 431         WORD i;                                         // (Temp) word
 432         WORD tdb;                                       // eattr & TDB
 433         LONG oaddr;
 434         int reg2;
 435         WORD flags;
 436         unsigned page_jump = 0;
 437         unsigned address = 0;
 438         unsigned j;
 439         char buf[EBUFSIZ];
 440
 441         SECT * sc = &sect[sno];
 442         CHUNK * ch = sc->sffix;
 443
 444         if (ch == NULL)
 445                 return 0;
 446
 447         CHUNK * cch = sc->sfcode;                               // "cache" first chunk
 448
 449         if (cch == NULL)                                                // Can't fixup a sect with nothing in it
 450                 return 0;
 451
 452         do
 453         {
 454                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 455                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 456
 457                 while (fup.wp < fuend)
 458                 {
 459                         w = *fup.wp++;
 460                         loc = *fup.lp++;
 461                         cfileno = *fup.wp++;
 462                         curlineno = (int)*fup.wp++;
 463 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 464                         // This is based on global vars cfileno, curfname :-P
 465                         // This approach is kinda meh as well. I think we can do better than this.
 466                         SetFilenameForErrorReporting();
 467
 468                         esym = NULL;
 469
 470                         // Search for chunk containing location to fix up; compute a
 471                         // pointer to the location (in the chunk). Often we will find the
 472                         // fixup is in the "cached" chunk, so the linear-search is seldom
 473                         // executed.
 474                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 475                         {
 476                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 477                                 {
 478                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 479                                                 break;
 480                                 }
 481
 482                                 if (cch == NULL)
 483                                 {
 484                                         interror(7);                    // Fixup (loc) out of range
 485                                         // NOTREACHED
 486                                 }
 487                         }
 488
 489                         locp = cch->chptr + (loc - cch->chloc);
 490                         eattr = 0;
 491
 492                         // Compute expression/symbol value and attribs
 493                         // Complex expression
 494                         if (w & FU_EXPR)
 495                         {
 496                                 i = *fup.wp++;
 497
 498                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 499                                 {
 500                                         fup.lp += i;
 501                                         continue;
 502                                 }
 503
 504                                 fup.lp += i;
 505                         }
 506                         // Simple symbol
 507                         else
 508                         {
 509                                 sy = *fup.sy++;
 510                                 eattr = sy->sattr;
 511
 512                                 if (eattr & DEFINED)
 513                                         eval = sy->svalue;
 514                                 else
 515                                         eval = 0;
 516
 517                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 518                                         esym = sy;
 519                         }
 520
 521                         tdb = (WORD)(eattr & TDB);
 522
 523                         // If the expression is undefined and no external symbol is
 524                         // involved, then it's an error.
 525                         if (!(eattr & DEFINED) && esym == NULL)
 526                         {
 527                                 error(undef_error);
 528                                 continue;
 529                         }
 530
 531                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 532                                 esym->sattre |= RISCSYM;
 533
 534                         // Do the fixup
 535                         //
 536                         // If a PC-relative fixup is undefined, its value is *not*
 537                         // subtracted from the location (that will happen in the linker
 538                         // when the external reference is resolved).
 539                         //
 540                         // MWC expects PC-relative things to have the LOC subtracted from
 541                         // the value, if the value is external (that is, undefined at this
 542                         // point).
 543                         //
 544                         // PC-relative fixups must be DEFINED and either in the same
 545                         // section (whereupon the subtraction takes place) or ABS (with no
 546                         // subtract).
 547                         if (w & FU_PCREL)
 548                         {
 549                                 if (eattr & DEFINED)
 550                                 {
 551                                         if (tdb == sno)
 552                                                 eval -= (VALUE)loc;
 553                                         else if (tdb)
 554                                         {
 555                                                 error("PC-relative expr across sections");
 556                                                 continue;
 557                                         }
 558
 559                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 560                                                 warn("unoptimized short branch");
 561                                 }
 562                                 else if (obj_format == MWC)
 563                                         eval -= (VALUE)loc;
 564
 565                                 tdb = 0;
 566                                 eattr &= ~TDB;
 567                         }
 568
 569                         // Do fixup classes
 570                         switch ((int)(w & FUMASK))
 571                         {
 572                         // FU_BBRA fixes up a one-byte branch offset.
 573                         case FU_BBRA:
 574                                 if (!(eattr & DEFINED))
 575                                 {
 576                                         error("external short branch");
 577                                         continue;
 578                                 }
 579
 580                                 eval -= 2;
 581
 582                                 if (eval + 0x80 >= 0x100)
 583                                         goto range;
 584
 585                                 if (eval == 0)
 586                                 {
 587                                         error("illegal bra.s with zero offset");
 588                                         continue;
 589                                 }
 590
 591                                 *++locp = (char)eval;
 592                                 break;
 593                         // Fixup one-byte value at locp + 1.
 594                         case FU_WBYTE:
 595                                 locp++;
 596                                 // FALLTHROUGH
 597                         // Fixup one-byte forward references
 598                         case FU_BYTE:
 599                                 if (!(eattr & DEFINED))
 600                                 {
 601                                         error("external byte reference");
 602                                         continue;
 603                                 }
 604
 605                                 if (tdb)
 606                                 {
 607                                         error("non-absolute byte reference");
 608                                         continue;
 609                                 }
 610
 611                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 612                                         goto range;
 613
 614                                 if (w & FU_SEXT)
 615                                 {
 616                                         if (eval + 0x100 >= 0x200)
 617                                                 goto range;
 618                                 }
 619                                 else if (eval >= 0x100)
 620                                         goto range;
 621
 622                                 *locp = (char)eval;
 623                                 break;
 624                         // Fixup WORD forward references;
 625                         // the word could be unaligned in the section buffer, so we have to
 626                         // be careful.
 627                         case FU_WORD:
 628                                 if ((w & 0x0F00) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
 629                                 {
 630                                         oaddr = *fup.lp++;
 631
 632                                         if (oaddr)
 633                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 634                                         else
 635                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 636
 637 #if 0
 638                                         if ((w & 0x0F00) == FU_MJR)
 639                                         {
 640                                                 // Main code destination alignment checking here for
 641                                                 // forward declared labels
 642                                                 address = (oaddr) ? oaddr : loc;
 643
 644                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 645                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 646                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 647                                                 {
 648                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 649                                                                 "main memory and local gpu ram", address);
 650                                                 }
 651                                                 else
 652                                                 {
 653                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 654
 655                                                         if (page_jump)
 656                                                         {
 657                                                                 // This jump is to a page outside of the
 658                                                                 // current 256 byte page
 659                                                                 if (eval % 4)
 660                                                                 {
 661                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 662                                                                 }
 663                                                         }
 664                                                         else
 665                                                         {
 666                                                                 // This jump is in the current 256 byte page
 667                                                                 if ((eval - 2) % 4)
 668                                                                 {
 669                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 670                                                                 }
 671                                                         }
 672                                                 }
 673                                         }
 674 #endif
 675
 676                                         if ((reg2 < -16) || (reg2 > 15))
 677                                         {
 678                                                 error("relative jump out of range");
 679                                                 break;
 680                                         }
 681
 682                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 683                                         locp++;
 684                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 685                                         break;
 686                                 }
 687
 688                                 if ((w & 0x0F00) == FU_NUM15)
 689                                 {
 690                                         if (eval < -16 || eval > 15)
 691                                         {
 692                                                 error("constant out of range");
 693                                                 break;
 694                                         }
 695
 696                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 697                                         locp++;
 698                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 699                                         break;
 700                                 }
 701
 702                                 if ((w & 0x0F00) == FU_NUM31)
 703                                 {
 704                                         if (eval < 0 || eval > 31)
 705                                         {
 706                                                 error("constant out of range");
 707                                                 break;
 708                                         }
 709
 710                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 711                                         locp++;
 712                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 713                                         break;
 714                                 }
 715
 716                                 if ((w & 0x0F00) == FU_NUM32)
 717                                 {
 718                                         if (eval < 1 || eval > 32)
 719                                         {
 720                                                 error("constant out of range");
 721                                                 break;
 722                                         }
 723
 724                                         if (w & FU_SUB32)
 725                                                 eval = (32 - eval);
 726
 727                                         eval = (eval == 32) ? 0 : eval;
 728                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 729                                         locp++;
 730                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 731                                         break;
 732                                 }
 733
 734                                 if ((w & 0x0F00) == FU_REGONE)
 735                                 {
 736                                         if (eval < 0 || eval > 31)
 737                                         {
 738                                                 error("register value out of range");
 739                                                 break;
 740                                         }
 741
 742                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 743                                         locp++;
 744                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 745                                         break;
 746                                 }
 747
 748                                 if ((w & 0x0F00) == FU_REGTWO)
 749                                 {
 750                                         if (eval < 0 || eval > 31)
 751                                         {
 752                                                 error("register value out of range");
 753                                                 break;
 754                                         }
 755
 756                                         locp++;
 757                                         *locp = (char)(*locp | (eval & 0x1F));
 758                                         break;
 759                                 }
 760
 761                                 if (!(eattr & DEFINED))
 762                                 {
 763                                         if (w & FU_PCREL)
 764                                                 w = MPCREL | MWORD;
 765                                         else
 766                                                 w = MWORD;
 767
 768                                         rmark(sno, loc, 0, w, esym);
 769                                 }
 770                                 else
 771                                 {
 772                                         if (tdb)
 773                                                 rmark(sno, loc, tdb, MWORD, NULL);
 774
 775                                         if (w & FU_SEXT)
 776                                         {
 777                                                 if (eval + 0x10000 >= 0x20000)
 778                                                         goto range;
 779                                         }
 780                                         else
 781                                         {
 782                                                 // Range-check BRA and DBRA
 783                                                 if (w & FU_ISBRA)
 784                                                 {
 785                                                         if (eval + 0x8000 >= 0x10000)
 786                                                         goto range;
 787                                                 }
 788                                                 else if (eval >= 0x10000)
 789                                                         goto range;
 790                                         }
 791                                 }
 792
 793                                 *locp++ = (char)(eval >> 8);
 794                                 *locp = (char)eval;
 795                                 break;
 796                         // Fixup LONG forward references;
 797                         // the long could be unaligned in the section buffer, so be careful
 798                         // (again).
 799                         case FU_LONG:
 800                                 if ((w & 0x0F00) == FU_MOVEI)
 801                                 {
 802 #if 0
 803                                         address = loc + 4;
 804
 805                                         if (eattr & DEFINED)
 806                                         {
 807                                                 for(j=0; j<fwindex; j++)
 808                                                 {
 809                                                         if (fwdjump[j] == address)
 810                                                         {
 811                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 812
 813                                                                 if (page_jump)
 814                                                                 {
 815                                                                         if (eval % 4)
 816                                                                         {
 817                                                                                 err_setup();
 818                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 819
 820                                                                                 if (listing > 0)
 821                                                                                         ship_ln(buf);
 822
 823                                                                                 if (err_flag)
 824                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 825                                                                                 else
 826                                                                                         printf("%s\n", buf);
 827                                                                         }
 828                                                                 }
 829                                                                 else
 830                                                                 {
 831                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 832                                                                         {
 833                                                                                 err_setup();
 834                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 835
 836                                                                                 if (listing > 0)
 837                                                                                         ship_ln(buf);
 838
 839                                                                                 if (err_flag)
 840                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 841                                                                                 else
 842                                                                                         printf("%s\n", buf);
 843                                                                         }
 844                                                                 }
 845
 846                                                                 // Clear this jump as it has been checked
 847                                                                 fwdjump[j] = 0;
 848                                                                 j = fwindex;
 849                                                         }
 850                                                 }
 851                                         }
 852 #endif
 853
 854                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 855                                         flags = (MLONG | MMOVEI);
 856                                 }
 857                                 else
 858                                         flags = MLONG;
 859
 860                                 if (!(eattr & DEFINED))
 861                                 {
 862 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
 863                                         rmark(sno, loc, 0, flags, esym);
 864                                 }
 865                                 else if (tdb)
 866                                 {
 867 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 868                                         rmark(sno, loc, tdb, flags, NULL);
 869                                 }
 870 //else
 871 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 872
 873                                 *locp++ = (char)(eval >> 24);
 874                                 *locp++ = (char)(eval >> 16);
 875                                 *locp++ = (char)(eval >> 8);
 876                                 *locp = (char)eval;
 877                                 break;
 878
 879                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 880                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 881                         case FU_QUICK:
 882                                 if (!(eattr & DEFINED))
 883                                 {
 884                                         error("External quick reference");
 885                                         continue;
 886                                 }
 887
 888                                 if (eval < 1 || eval > 8)
 889                                         goto range;
 890
 891                                 *locp |= (eval & 7) << 1;
 892                                 break;
 893
 894                         // Fix up 6502 funny branch
 895                         case FU_6BRA:
 896                                 eval -= (loc + 1);
 897
 898                                 if (eval + 0x80 >= 0x100)
 899                                         goto range;
 900
 901                                 *locp = (char)eval;
 902                                 break;
 903
 904                         default:
 905                                 interror(4);                                 // Bad fixup type
 906                                 // NOTREACHED
 907                         }
 908                         continue;
 909 range:
 910                         error("expression out of range");
 911                 }
 912
 913                 ch = ch->chnext;
 914         }
 915         while (ch != NULL);
 916
 917         return 0;
 918 }
 919