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                 }
 284                 else
 285                 {
 286 //                      i = 14;
 287                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 288                 }
 289         }
 290         else
 291         {
 292                 attr |= FU_EXPR;
 293
 294                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 295                 {
 296                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 297                                 len++;
 298                 }
 299
 300                 len++;                                                          // Add 1 for ENDEXPR
 301 //              i = (len << 2) + 12;
 302                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 303         }
 304
 305         // Maybe alloc another fixup chunk for this one to fit in
 306         if ((fchalloc - fchsize) < i)
 307         {
 308                 p = &sect[cursect];
 309                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 310
 311                 // First fixup chunk in section
 312                 if (sfix == NULL)
 313                 {
 314                         cp->chprev = NULL;
 315                         p->sffix = cp;
 316                 }
 317                 // Add to other chunks
 318                 else
 319                 {
 320                         cp->chprev = sfix;
 321                         sfix->chnext = cp;
 322                         sfix->ch_size = fchsize;
 323                 }
 324
 325                 // Setup fixup chunk and its global vars
 326                 cp->chnext = NULL;
 327                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 328                 fchsize = cp->ch_size = 0;
 329                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 330                 sfix = p->sfix = cp;
 331         }
 332
 333         // Record fixup type, fixup location, and the file number and line number
 334         // the fixup is located at.
 335         *fchptr.wp++ = attr;
 336         *fchptr.lp++ = loc;
 337         *fchptr.wp++ = cfileno;
 338         *fchptr.wp++ = (WORD)curlineno;
 339
 340         // Store postfix expression or pointer to a single symbol, or nothing for a
 341         // mark.
 342         if (attr & FU_EXPR)
 343         {
 344                 *fchptr.wp++ = (WORD)len;
 345
 346                 while (len--)
 347                         *fchptr.lp++ = (LONG)*fexpr++;
 348         }
 349         else
 350         {
 351 //              *fchptr.lp++ = (LONG)fexpr[1];
 352                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 353         }
 354
 355         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 356         if ((attr & 0x0F00) == FU_JR)
 357         {
 358                 if (orgactive)
 359                         *fchptr.lp++ = orgaddr;
 360                 else
 361                         *fchptr.lp++ = 0x00000000;
 362         }
 363
 364         fchsize += i;
 365         return 0;
 366 }
 367
 368
 369 //
 370 // Resolve all Fixups
 371 //
 372 int ResolveAllFixups(void)
 373 {
 374         unsigned i;
 375         char buf[EBUFSIZ];
 376
 377         // Make undefined symbols GLOBL
 378         if (glob_flag)
 379                 syg_fix();
 380
 381         DEBUG printf("Resolving TEXT sections...\n");
 382         ResolveFixups(TEXT);
 383         DEBUG printf("Resolving DATA sections...\n");
 384         ResolveFixups(DATA);
 385
 386         // We need to do a final check of forward 'jump' destination addresses that
 387         // are external
 388         for(i=0; i<MAXFWDJUMPS; i++)
 389         {
 390                 if (fwdjump[i])
 391                 {
 392                         err_setup();
 393                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 394
 395                         if (listing > 0)
 396                                 ship_ln(buf);
 397
 398                         if (err_flag)
 399                                 write(err_fd, buf, (LONG)strlen(buf));
 400                         else
 401                                 printf("%s\n", buf);
 402                 }
 403         }
 404
 405         return 0;
 406 }
 407
 408
 409 //
 410 // Resolve Fixups in a Section
 411 //
 412 int ResolveFixups(int sno)
 413 {
 414         PTR fup;                                        // Current fixup
 415         WORD * fuend;                           // End of last fixup (in this chunk)
 416         WORD w;                                         // Fixup word (type+modes+flags)
 417         char * locp;                            // Location to fix (in cached chunk)
 418         LONG loc;                                       // Location to fixup
 419         VALUE eval;                                     // Expression value
 420         WORD eattr;                                     // Expression attrib
 421         SYM * esym;                                     // External symbol involved in expr
 422         SYM * sy;                                       // (Temp) pointer to a symbol
 423         WORD i;                                         // (Temp) word
 424         WORD tdb;                                       // eattr & TDB
 425         LONG oaddr;
 426         int reg2;
 427         WORD flags;
 428         unsigned page_jump = 0;
 429         unsigned address = 0;
 430         unsigned j;
 431         char buf[EBUFSIZ];
 432
 433         SECT * sc = &sect[sno];
 434         CHUNK * ch = sc->sffix;
 435
 436         if (ch == NULL)
 437                 return 0;
 438
 439         CHUNK * cch = sc->sfcode;                               // "cache" first chunk
 440
 441         if (cch == NULL)                                                // Can't fixup a sect with nothing in it
 442                 return 0;
 443
 444         do
 445         {
 446                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 447                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 448
 449                 while (fup.wp < fuend)
 450                 {
 451                         w = *fup.wp++;
 452                         loc = *fup.lp++;
 453                         cfileno = *fup.wp++;
 454                         curlineno = (int)*fup.wp++;
 455
 456                         esym = NULL;
 457
 458                         // Search for chunk containing location to fix up; compute a
 459                         // pointer to the location (in the chunk). Often we will find the
 460                         // fixup is in the "cached" chunk, so the linear-search is seldom
 461                         // executed.
 462                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 463                         {
 464                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 465                                 {
 466                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 467                                                 break;
 468                                 }
 469
 470                                 if (cch == NULL)
 471                                 {
 472                                         interror(7);                    // Fixup (loc) out of range
 473                                         // NOTREACHED
 474                                 }
 475                         }
 476
 477                         locp = cch->chptr + (loc - cch->chloc);
 478                         eattr = 0;
 479
 480                         // Compute expression/symbol value and attribs
 481                         // Complex expression
 482                         if (w & FU_EXPR)
 483                         {
 484                                 i = *fup.wp++;
 485
 486                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 487                                 {
 488                                         fup.lp += i;
 489                                         continue;
 490                                 }
 491
 492                                 fup.lp += i;
 493                         }
 494                         // Simple symbol
 495                         else
 496                         {
 497                                 sy = *fup.sy++;
 498                                 eattr = sy->sattr;
 499
 500                                 if (eattr & DEFINED)
 501                                         eval = sy->svalue;
 502                                 else
 503                                         eval = 0;
 504
 505                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 506                                         esym = sy;
 507                         }
 508
 509                         tdb = (WORD)(eattr & TDB);
 510
 511                         // If the expression is undefined and no external symbol is
 512                         // involved, then it's an error.
 513                         if (!(eattr & DEFINED) && esym == NULL)
 514                         {
 515                                 error(undef_error);
 516                                 continue;
 517                         }
 518
 519                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 520                                 esym->sattre |= RISCSYM;
 521
 522                         // Do the fixup
 523                         //
 524                         // If a PC-relative fixup is undefined, its value is *not*
 525                         // subtracted from the location (that will happen in the linker
 526                         // when the external reference is resolved).
 527                         //
 528                         // MWC expects PC-relative things to have the LOC subtracted from
 529                         // the value, if the value is external (that is, undefined at this
 530                         // point).
 531                         //
 532                         // PC-relative fixups must be DEFINED and either in the same
 533                         // section (whereupon the subtraction takes place) or ABS (with no
 534                         // subtract).
 535                         if (w & FU_PCREL)
 536                         {
 537                                 if (eattr & DEFINED)
 538                                 {
 539                                         if (tdb == sno)
 540                                                 eval -= (VALUE)loc;
 541                                         else if (tdb)
 542                                         {
 543                                                 error("PC-relative expr across sections");
 544                                                 continue;
 545                                         }
 546
 547                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 548                                                 warn("unoptimized short branch");
 549                                 }
 550                                 else if (obj_format == MWC)
 551                                         eval -= (VALUE)loc;
 552
 553                                 tdb = 0;
 554                                 eattr &= ~TDB;
 555                         }
 556
 557                         // Do fixup classes
 558                         switch ((int)(w & FUMASK))
 559                         {
 560                         // FU_BBRA fixes up a one-byte branch offset.
 561                         case FU_BBRA:
 562                                 if (!(eattr & DEFINED))
 563                                 {
 564                                         error("external short branch");
 565                                         continue;
 566                                 }
 567
 568                                 eval -= 2;
 569
 570                                 if (eval + 0x80 >= 0x100)
 571                                         goto range;
 572
 573                                 if (eval == 0)
 574                                 {
 575                                         error("illegal bra.s with zero offset");
 576                                         continue;
 577                                 }
 578
 579                                 *++locp = (char)eval;
 580                                 break;
 581                         // Fixup one-byte value at locp + 1.
 582                         case FU_WBYTE:
 583                                 ++locp;
 584                                 // FALLTHROUGH
 585                         // Fixup one-byte forward references
 586                         case FU_BYTE:
 587                                 if (!(eattr & DEFINED))
 588                                 {
 589                                         error("external byte reference");
 590                                         continue;
 591                                 }
 592
 593                                 if (tdb)
 594                                 {
 595                                         error("non-absolute byte reference");
 596                                         continue;
 597                                 }
 598
 599                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 600                                         goto range;
 601
 602                                 if (w & FU_SEXT)
 603                                 {
 604                                         if (eval + 0x100 >= 0x200)
 605                                                 goto range;
 606                                 }
 607                                 else if (eval >= 0x100)
 608                                         goto range;
 609
 610                                 *locp = (char)eval;
 611                                 break;
 612                         // Fixup WORD forward references;
 613                         // the word could be unaligned in the section buffer, so we have to
 614                         // be careful.
 615                         case FU_WORD:
 616                                 if (((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR))
 617                                 {
 618                                         oaddr = *fup.lp++;
 619
 620                                         if (oaddr)
 621                                         {
 622                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 623                                         }
 624                                         else
 625                                         {
 626                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 627                                         }
 628
 629                                         if ((w & 0x0F00) == FU_MJR)
 630                                         {
 631                                                 // Main code destination alignment checking here for
 632                                                 // forward declared labels
 633                                                 address = (oaddr) ? oaddr : loc;
 634
 635                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 636                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 637                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 638                                                 {
 639                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 640                                                                 "main memory and local gpu ram", address);
 641                                                 }
 642                                                 else
 643                                                 {
 644                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 645
 646                                                         if (page_jump)
 647                                                         {
 648                                                                 // This jump is to a page outside of the
 649                                                                 // current 256 byte page
 650                                                                 if (eval % 4)
 651                                                                 {
 652                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 653                                                                 }
 654                                                         }
 655                                                         else
 656                                                         {
 657                                                                 // This jump is in the current 256 byte page
 658                                                                 if ((eval - 2) % 4)
 659                                                                 {
 660                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 661                                                                 }
 662                                                         }
 663                                                 }
 664                                         }
 665
 666                                         if ((reg2 < -16) || (reg2 > 15))
 667                                         {
 668                                                 error("relative jump out of range");
 669                                                 break;
 670                                         }
 671
 672                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 673                                         locp++;
 674                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 675                                         break;
 676                                 }
 677
 678                                 if ((w & 0x0F00) == FU_NUM15)
 679                                 {
 680                                         if (eval < -16 || eval > 15)
 681                                         {
 682                                                 error("constant out of range");
 683                                                 break;
 684                                         }
 685
 686                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 687                                         locp++;
 688                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 689                                         break;
 690                                 }
 691
 692                                 if ((w & 0x0F00) == FU_NUM31)
 693                                 {
 694                                         if (eval < 0 || eval > 31)
 695                                         {
 696                                                 error("constant out of range");
 697                                                 break;
 698                                         }
 699
 700                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 701                                         locp++;
 702                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 703                                         break;
 704                                 }
 705
 706                                 if ((w & 0x0F00) == FU_NUM32)
 707                                 {
 708                                         if (eval < 1 || eval > 32)
 709                                         {
 710                                                 error("constant out of range");
 711                                                 break;
 712                                         }
 713
 714                                         if (w & FU_SUB32)
 715                                                 eval = (32 - eval);
 716
 717                                         eval = (eval == 32) ? 0 : eval;
 718                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 719                                         locp++;
 720                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 721                                         break;
 722                                 }
 723
 724                                 if ((w & 0x0F00) == FU_REGONE)
 725                                 {
 726                                         if (eval < 0 || eval > 31)
 727                                         {
 728                                                 error("register value out of range");
 729                                                 break;
 730                                         }
 731
 732                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 733                                         locp++;
 734                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 735                                         break;
 736                                 }
 737
 738                                 if ((w & 0x0F00) == FU_REGTWO)
 739                                 {
 740                                         if (eval < 0 || eval > 31)
 741                                         {
 742                                                 error("register value out of range");
 743                                                 break;
 744                                         }
 745
 746                                         locp++;
 747                                         *locp = (char)(*locp | (eval & 0x1F));
 748                                         break;
 749                                 }
 750
 751                                 if (!(eattr & DEFINED))
 752                                 {
 753                                         if (w & FU_PCREL)
 754                                                 w = MPCREL | MWORD;
 755                                         else
 756                                                 w = MWORD;
 757
 758                                         rmark(sno, loc, 0, w, esym);
 759                                 }
 760                                 else
 761                                 {
 762                                         if (tdb)
 763                                                 rmark(sno, loc, tdb, MWORD, NULL);
 764
 765                                         if (w & FU_SEXT)
 766                                         {
 767                                                 if (eval + 0x10000 >= 0x20000)
 768                                                         goto range;
 769                                         }
 770                                         else
 771                                         {
 772                                                 // Range-check BRA and DBRA
 773                                                 if (w & FU_ISBRA)
 774                                                 {
 775                                                         if (eval + 0x8000 >= 0x10000)
 776                                                         goto range;
 777                                                 }
 778                                                 else if (eval >= 0x10000)
 779                                                         goto range;
 780                                         }
 781                                 }
 782
 783                                 *locp++ = (char)(eval >> 8);
 784                                 *locp = (char)eval;
 785                                 break;
 786                         // Fixup LONG forward references;
 787                         // the long could be unaligned in the section buffer, so be careful
 788                         // (again).
 789                         case FU_LONG:
 790                                 if ((w & 0x0F00) == FU_MOVEI)
 791                                 {
 792                                         address = loc + 4;
 793
 794                                         if (eattr & DEFINED)
 795                                         {
 796                                                 for(j=0; j<fwindex; j++)
 797                                                 {
 798                                                         if (fwdjump[j] == address)
 799                                                         {
 800                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 801
 802                                                                 if (page_jump)
 803                                                                 {
 804                                                                         if (eval % 4)
 805                                                                         {
 806                                                                                 err_setup();
 807                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 808
 809                                                                                 if (listing > 0)
 810                                                                                         ship_ln(buf);
 811
 812                                                                                 if (err_flag)
 813                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 814                                                                                 else
 815                                                                                         printf("%s\n", buf);
 816                                                                         }
 817                                                                 }
 818                                                                 else
 819                                                                 {
 820                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 821                                                                         {
 822                                                                                 err_setup();
 823                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 824
 825                                                                                 if (listing > 0)
 826                                                                                         ship_ln(buf);
 827
 828                                                                                 if (err_flag)
 829                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 830                                                                                 else
 831                                                                                         printf("%s\n", buf);
 832                                                                         }
 833                                                                 }
 834
 835                                                                 // Clear this jump as it has been checked
 836                                                                 fwdjump[j] = 0;
 837                                                                 j = fwindex;
 838                                                         }
 839                                                 }
 840                                         }
 841
 842                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 843                                         flags = (MLONG|MMOVEI);
 844                                 }
 845                                 else
 846                                         flags = MLONG;
 847
 848                                 if (!(eattr & DEFINED))
 849                                 {
 850                                         rmark(sno, loc, 0, flags, esym);
 851                                 }
 852                                 else if (tdb)
 853                                 {
 854                                         rmark(sno, loc, tdb, flags, NULL);
 855                                 }
 856
 857                                 *locp++ = (char)(eval >> 24);
 858                                 *locp++ = (char)(eval >> 16);
 859                                 *locp++ = (char)(eval >> 8);
 860                                 *locp = (char)eval;
 861                                 break;
 862                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 863                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 864                         case FU_QUICK:
 865                                 if (!(eattr & DEFINED))
 866                                 {
 867                                         error("External quick reference");
 868                                         continue;
 869                                 }
 870
 871                                 if (eval < 1 || eval > 8)
 872                                         goto range;
 873
 874                                 *locp |= (eval & 7) << 1;
 875                                 break;
 876                         // Fix up 6502 funny branch
 877                         case FU_6BRA:
 878                                 eval -= (loc + 1);
 879
 880                                 if (eval + 0x80 >= 0x100)
 881                                         goto range;
 882
 883                                 *locp = (char)eval;
 884                                 break;
 885                         default:
 886                                 interror(4);                                 // Bad fixup type
 887                                 // NOTREACHED
 888                         }
 889                         continue;
 890 range:
 891                         error("expression out of range");
 892                 }
 893
 894                 ch = ch->chnext;
 895         }
 896         while (ch != NULL);
 897
 898         return 0;
 899 }