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 MakeSection(int, WORD);
  23 void SwitchSection(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                 MakeSection(i, 0);
  81
  82         // Construct default sections, make TEXT the current section
  83         MakeSection(ABS,   SUSED | SABS | SBSS);                // ABS
  84         MakeSection(TEXT,  SUSED | TEXT       );                // TEXT
  85         MakeSection(DATA,  SUSED | DATA       );                // DATA
  86         MakeSection(BSS,   SUSED | BSS  | SBSS);                // BSS
  87 //      MakeSection(M6502, SUSED | TEXT       );                // 6502 code section
  88
  89         // Switch to TEXT for starters
  90         SwitchSection(TEXT);
  91 }
  92
  93
  94 //
  95 // Make a new (clean) section
  96 //
  97 void MakeSection(int sno, WORD attr)
  98 {
  99         SECT * p = &sect[sno];
 100         p->scattr = attr;
 101         p->sloc = 0;
 102         p->scode = p->sfcode = NULL;
 103         p->sfix = p->sffix = NULL;
 104 }
 105
 106
 107 //
 108 // Switch to another section (copy section & chunk descriptors to global vars
 109 // for fast access)
 110 //
 111 void SwitchSection(int sno)
 112 {
 113         CHUNK * cp;
 114         cursect = sno;
 115         SECT * p = &sect[sno];
 116
 117         // Copy section vars
 118         scattr = p->scattr;
 119         sloc = p->sloc;
 120         scode = p->scode;
 121         sfix = p->sfix;
 122
 123         // Copy code chunk vars
 124         if ((cp = scode) != NULL)
 125         {
 126                 challoc = cp->challoc;
 127                 ch_size = cp->ch_size;
 128                 chptr = cp->chptr + ch_size;
 129         }
 130         else
 131                 challoc = ch_size = 0;
 132
 133         // Copy fixup chunk vars
 134         if ((cp = sfix) != NULL)
 135         {
 136                 fchalloc = cp->challoc;
 137                 fchsize = cp->ch_size;
 138                 fchptr.cp = cp->chptr + fchsize;
 139         }
 140         else
 141                 fchalloc = fchsize = 0;
 142 }
 143
 144
 145 //
 146 // Save current section
 147 //
 148 void SaveSection(void)
 149 {
 150         SECT * p = &sect[cursect];
 151
 152         p->scattr = scattr;                                             // Bailout section vars
 153         p->sloc = sloc;
 154
 155         if (scode != NULL)                                              // Bailout code chunk
 156                 scode->ch_size = ch_size;
 157
 158         if (sfix != NULL)                                               // Bailout fixup chunk
 159                 sfix->ch_size = fchsize;
 160 }
 161
 162
 163 //
 164 // Test to see if a location has a fixup sic'd on it.  This is used by the
 165 // listing generator to print 'xx's instead of '00's for forward references
 166 //
 167 int fixtest(int sno, LONG loc)
 168 {
 169         CHUNK * ch;
 170         PTR fup;
 171         char * fuend;
 172         WORD w;
 173         LONG xloc;
 174
 175         // Force update to sect[] variables
 176         StopMark();
 177
 178         // Hairy, ugly linear search for a mark on our location; the speed doesn't
 179         // matter, since this is only done when generating a listing, which is
 180         // SLOW.
 181         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 182         {
 183                 fup.cp = (char *)ch->chptr;
 184                 fuend = fup.cp + ch->ch_size;
 185
 186                 while (fup.cp < fuend)
 187                 {
 188                         w = *fup.wp++;
 189                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 190                         fup.wp += 2;
 191
 192                         if (xloc == loc)
 193                                 return (int)fusiztab[w & FUMASK];
 194
 195                         if (w & FU_EXPR)
 196                         {
 197                                 w = *fup.wp++;
 198                                 fup.lp += w;
 199                         }
 200                         else
 201                                 fup.lp++;
 202                 }
 203         }
 204
 205         return 0;
 206 }
 207
 208
 209 //
 210 // Check that there are at least 'amt' bytes left in the current chunk. If
 211 // there are not, allocate another chunk of at least 'amt' bytes (and probably
 212 // more).
 213 //
 214 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 215 //
 216 int chcheck(LONG amt)
 217 {
 218         DEBUG { printf("chcheck(%u)\n", amt); }
 219         // If in BSS section, no allocation required
 220         if (scattr & SBSS)
 221                 return 0;
 222
 223         if (!amt)
 224                 amt = CH_THRESHOLD;
 225
 226         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
 227         if ((int)(challoc - ch_size) >= (int)amt)
 228                 return 0;
 229
 230         if (amt < CH_CODE_SIZE)
 231                 amt = CH_CODE_SIZE;
 232
 233         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 234         SECT * p = &sect[cursect];
 235         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 236
 237         // First chunk in section
 238         if (scode == NULL)
 239         {
 240                 cp->chprev = NULL;
 241                 p->sfcode = cp;
 242         }
 243         // Add chunk to other chunks
 244         else
 245         {
 246                 cp->chprev = scode;
 247                 scode->chnext = cp;
 248                 scode->ch_size = ch_size;                       // Save old chunk's globals
 249         }
 250
 251         // Setup chunk and global vars
 252         cp->chloc = sloc;
 253         cp->chnext = NULL;
 254         challoc = cp->challoc = amt;
 255         ch_size = cp->ch_size = 0;
 256         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 257         scode = p->scode = cp;
 258
 259         return 0;
 260 }
 261
 262
 263 // This is really wrong. We need to make some proper structures here so we
 264 // don't have to count sizes of objects, that's what the compiler's for! :-P
 265 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
 266 //
 267 // Arrange for a fixup on a location
 268 //
 269 int AddFixup(WORD attr, LONG loc, TOKEN * fexpr)
 270 {
 271         LONG i;
 272         LONG len = 0;
 273         CHUNK * cp;
 274         SECT * p;
 275         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
 276         //         this.
 277 #warning "!!! AddFixup() is filled with VOODOO !!!"
 278         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 279
 280         // Compute length of expression (could be faster); determine if it's the
 281         // single-symbol case; no expression if it's just a mark. This code assumes
 282         // 16 bit WORDs and 32 bit LONGs
 283         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 284         {
 285                 // Just a single symbol
 286                 // SCPCD : correct bit mask for attr (else other FU_xxx will match)
 287                 // NYAN !
 288                 if ((attr & FUMASKRISC) == FU_JR)
 289                 {
 290 //                      i = 18;
 291 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 292                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 293                 }
 294                 else
 295                 {
 296 //                      i = 14;
 297                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 298                 }
 299         }
 300         else
 301         {
 302                 attr |= FU_EXPR;
 303
 304                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 305                 {
 306                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 307                                 len++;
 308                 }
 309
 310                 len++;                                                          // Add 1 for ENDEXPR
 311 //              i = (len << 2) + 12;
 312                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 313         }
 314
 315         // Maybe alloc another fixup chunk for this one to fit in
 316         if ((fchalloc - fchsize) < i)
 317         {
 318                 p = &sect[cursect];
 319                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 320
 321                 // First fixup chunk in section
 322                 if (sfix == NULL)
 323                 {
 324                         cp->chprev = NULL;
 325                         p->sffix = cp;
 326                 }
 327                 // Add to other chunks
 328                 else
 329                 {
 330                         cp->chprev = sfix;
 331                         sfix->chnext = cp;
 332                         sfix->ch_size = fchsize;
 333                 }
 334
 335                 // Setup fixup chunk and its global vars
 336                 cp->chnext = NULL;
 337                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 338                 fchsize = cp->ch_size = 0;
 339                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 340                 sfix = p->sfix = cp;
 341         }
 342
 343         // Record fixup type, fixup location, and the file number and line number
 344         // the fixup is located at.
 345         *fchptr.wp++ = attr;
 346         *fchptr.lp++ = loc;
 347         *fchptr.wp++ = cfileno;
 348         *fchptr.wp++ = (WORD)curlineno;
 349
 350         // Store postfix expression or pointer to a single symbol, or nothing for a
 351         // mark.
 352         if (attr & FU_EXPR)
 353         {
 354                 *fchptr.wp++ = (WORD)len;
 355
 356                 while (len--)
 357                         *fchptr.lp++ = (LONG)*fexpr++;
 358         }
 359         else
 360         {
 361 //              *fchptr.lp++ = (LONG)fexpr[1];
 362                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 363         }
 364
 365         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 366         if ((attr & FUMASKRISC) == FU_JR)
 367         {
 368                 if (orgactive)
 369                         *fchptr.lp++ = orgaddr;
 370                 else
 371                         *fchptr.lp++ = 0x00000000;
 372         }
 373
 374         fchsize += i;
 375         return 0;
 376 }
 377
 378
 379 //
 380 // Resolve all fixups
 381 //
 382 int ResolveAllFixups(void)
 383 {
 384         unsigned i;
 385         char buf[EBUFSIZ];
 386
 387         // Make undefined symbols GLOBL
 388         if (glob_flag)
 389                 ForceUndefinedSymbolsGlobal();
 390
 391         DEBUG printf("Resolving TEXT sections...\n");
 392         ResolveFixups(TEXT);
 393         DEBUG printf("Resolving DATA sections...\n");
 394         ResolveFixups(DATA);
 395
 396         return 0;
 397 }
 398
 399
 400 //
 401 // Resolve fixups in a section
 402 //
 403 int ResolveFixups(int sno)
 404 {
 405         PTR fup;                                        // Current fixup
 406         WORD * fuend;                           // End of last fixup (in this chunk)
 407         WORD w;                                         // Fixup word (type+modes+flags)
 408         char * locp;                            // Location to fix (in cached chunk)
 409         LONG loc;                                       // Location to fixup
 410         VALUE eval;                                     // Expression value
 411         WORD eattr;                                     // Expression attrib
 412         SYM * esym;                                     // External symbol involved in expr
 413         SYM * sy;                                       // (Temp) pointer to a symbol
 414         WORD i;                                         // (Temp) word
 415         WORD tdb;                                       // eattr & TDB
 416         LONG oaddr;
 417         int reg2;
 418         WORD flags;
 419         unsigned page_jump = 0;
 420         unsigned address = 0;
 421         unsigned j;
 422         char buf[EBUFSIZ];
 423
 424         SECT * sc = &sect[sno];
 425         CHUNK * ch = sc->sffix;
 426
 427         if (ch == NULL)
 428                 return 0;
 429
 430         // "Cache" first chunk
 431         CHUNK * cch = sc->sfcode;
 432
 433         // Can't fixup a section with nothing in it
 434         if (cch == NULL)
 435                 return 0;
 436
 437         do
 438         {
 439                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 440                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 441
 442                 while (fup.wp < fuend)
 443                 {
 444                         w = *fup.wp++;
 445                         loc = *fup.lp++;
 446                         cfileno = *fup.wp++;
 447                         curlineno = (int)*fup.wp++;
 448 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 449                         // This is based on global vars cfileno, curfname :-P
 450                         // This approach is kinda meh as well. I think we can do better than this.
 451                         SetFilenameForErrorReporting();
 452
 453                         esym = NULL;
 454
 455                         // Search for chunk containing location to fix up; compute a
 456                         // pointer to the location (in the chunk). Often we will find the
 457                         // fixup is in the "cached" chunk, so the linear-search is seldom
 458                         // executed.
 459                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 460                         {
 461                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 462                                 {
 463                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 464                                                 break;
 465                                 }
 466
 467                                 if (cch == NULL)
 468                                 {
 469                                         // Fixup (loc) out of range
 470                                         interror(7);
 471                                         // NOTREACHED
 472                                 }
 473                         }
 474
 475                         locp = cch->chptr + (loc - cch->chloc);
 476                         eattr = 0;
 477
 478                         // Compute expression/symbol value and attribs
 479                         // Complex expression
 480                         if (w & FU_EXPR)
 481                         {
 482                                 i = *fup.wp++;
 483
 484                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 485                                 {
 486                                         fup.lp += i;
 487                                         continue;
 488                                 }
 489
 490                                 fup.lp += i;
 491                         }
 492                         // Simple symbol
 493                         else
 494                         {
 495                                 sy = *fup.sy++;
 496                                 eattr = sy->sattr;
 497
 498                                 if (eattr & DEFINED)
 499                                         eval = sy->svalue;
 500                                 else
 501                                         eval = 0;
 502
 503                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 504                                         esym = sy;
 505                         }
 506
 507                         tdb = (WORD)(eattr & TDB);
 508
 509                         // If the expression is undefined and no external symbol is
 510                         // involved, then it's an error.
 511                         if (!(eattr & DEFINED) && (esym == NULL))
 512                         {
 513                                 error(undef_error);
 514                                 continue;
 515                         }
 516
 517 // It seems that this is completely unnecessary!
 518 #if 0
 519                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
 520 //{
 521 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
 522                                 esym->sattre |= RISCSYM;
 523 //}
 524 #endif
 525
 526                         // Do the fixup
 527                         //
 528                         // If a PC-relative fixup is undefined, its value is *not*
 529                         // subtracted from the location (that will happen in the linker
 530                         // when the external reference is resolved).
 531                         //
 532                         // MWC expects PC-relative things to have the LOC subtracted from
 533                         // the value, if the value is external (that is, undefined at this
 534                         // point).
 535                         //
 536                         // PC-relative fixups must be DEFINED and either in the same
 537                         // section (whereupon the subtraction takes place) or ABS (with no
 538                         // subtract).
 539                         if (w & FU_PCREL)
 540                         {
 541                                 if (eattr & DEFINED)
 542                                 {
 543                                         if (tdb == sno)
 544                                                 eval -= (VALUE)loc;
 545                                         else if (tdb)
 546                                         {
 547                                                 error("PC-relative expr across sections");
 548                                                 continue;
 549                                         }
 550
 551                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 552                                                 warn("unoptimized short branch");
 553                                 }
 554                                 else if (obj_format == MWC)
 555                                         eval -= (VALUE)loc;
 556
 557                                 tdb = 0;
 558                                 eattr &= ~TDB;
 559                         }
 560
 561                         // Do fixup classes
 562                         switch ((int)(w & FUMASK))
 563                         {
 564                         // FU_BBRA fixes up a one-byte branch offset.
 565                         case FU_BBRA:
 566                                 if (!(eattr & DEFINED))
 567                                 {
 568                                         error("external short branch");
 569                                         continue;
 570                                 }
 571
 572                                 eval -= 2;
 573
 574                                 if (eval + 0x80 >= 0x100)
 575                                         goto range;
 576
 577                                 if (eval == 0)
 578                                 {
 579                                         error("illegal bra.s with zero offset");
 580                                         continue;
 581                                 }
 582
 583                                 *++locp = (char)eval;
 584                                 break;
 585                         // Fixup one-byte value at locp + 1.
 586                         case FU_WBYTE:
 587                                 locp++;
 588                                 // FALLTHROUGH
 589                         // Fixup one-byte forward references
 590                         case FU_BYTE:
 591                                 if (!(eattr & DEFINED))
 592                                 {
 593                                         error("external byte reference");
 594                                         continue;
 595                                 }
 596
 597                                 if (tdb)
 598                                 {
 599                                         error("non-absolute byte reference");
 600                                         continue;
 601                                 }
 602
 603                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 604                                         goto range;
 605
 606                                 if (w & FU_SEXT)
 607                                 {
 608                                         if (eval + 0x100 >= 0x200)
 609                                                 goto range;
 610                                 }
 611                                 else if (eval >= 0x100)
 612                                         goto range;
 613
 614                                 *locp = (char)eval;
 615                                 break;
 616                         // Fixup WORD forward references;
 617                         // the word could be unaligned in the section buffer, so we have to
 618                         // be careful.
 619                         case FU_WORD:
 620                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
 621                                 {
 622                                         oaddr = *fup.lp++;
 623
 624                                         if (oaddr)
 625                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 626                                         else
 627                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 628
 629 #if 0
 630                                         if ((w & 0x0F00) == FU_MJR)
 631                                         {
 632                                                 // Main code destination alignment checking here for
 633                                                 // forward declared labels
 634                                                 address = (oaddr) ? oaddr : loc;
 635
 636                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 637                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 638                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 639                                                 {
 640                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 641                                                                 "main memory and local gpu ram", address);
 642                                                 }
 643                                                 else
 644                                                 {
 645                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 646
 647                                                         if (page_jump)
 648                                                         {
 649                                                                 // This jump is to a page outside of the
 650                                                                 // current 256 byte page
 651                                                                 if (eval % 4)
 652                                                                 {
 653                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 654                                                                 }
 655                                                         }
 656                                                         else
 657                                                         {
 658                                                                 // This jump is in the current 256 byte page
 659                                                                 if ((eval - 2) % 4)
 660                                                                 {
 661                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 662                                                                 }
 663                                                         }
 664                                                 }
 665                                         }
 666 #endif
 667
 668                                         if ((reg2 < -16) || (reg2 > 15))
 669                                         {
 670                                                 error("relative jump out of range");
 671                                                 break;
 672                                         }
 673
 674                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 675                                         locp++;
 676                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 677                                         break;
 678                                 }
 679
 680                                 if ((w & FUMASKRISC) == FU_NUM15)
 681                                 {
 682                                         if (eval < -16 || eval > 15)
 683                                         {
 684                                                 error("constant out of range");
 685                                                 break;
 686                                         }
 687
 688                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 689                                         locp++;
 690                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 691                                         break;
 692                                 }
 693
 694                                 if ((w & FUMASKRISC) == FU_NUM31)
 695                                 {
 696                                         if (eval < 0 || eval > 31)
 697                                         {
 698                                                 error("constant out of range");
 699                                                 break;
 700                                         }
 701
 702                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 703                                         locp++;
 704                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 705                                         break;
 706                                 }
 707
 708                                 if ((w & FUMASKRISC) == FU_NUM32)
 709                                 {
 710                                         if (eval < 1 || eval > 32)
 711                                         {
 712                                                 error("constant out of range");
 713                                                 break;
 714                                         }
 715
 716                                         if (w & FU_SUB32)
 717                                                 eval = (32 - eval);
 718
 719                                         eval = (eval == 32) ? 0 : eval;
 720                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 721                                         locp++;
 722                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 723                                         break;
 724                                 }
 725
 726                                 if ((w & FUMASKRISC) == FU_REGONE)
 727                                 {
 728                                         if (eval < 0 || eval > 31)
 729                                         {
 730                                                 error("register value out of range");
 731                                                 break;
 732                                         }
 733
 734                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 735                                         locp++;
 736                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 737                                         break;
 738                                 }
 739
 740                                 if ((w & FUMASKRISC) == FU_REGTWO)
 741                                 {
 742                                         if (eval < 0 || eval > 31)
 743                                         {
 744                                                 error("register value out of range");
 745                                                 break;
 746                                         }
 747
 748                                         locp++;
 749                                         *locp = (char)(*locp | (eval & 0x1F));
 750                                         break;
 751                                 }
 752
 753                                 if (!(eattr & DEFINED))
 754                                 {
 755                                         if (w & FU_PCREL)
 756                                                 w = MPCREL | MWORD;
 757                                         else
 758                                                 w = MWORD;
 759
 760                                         rmark(sno, loc, 0, w, esym);
 761                                 }
 762                                 else
 763                                 {
 764                                         if (tdb)
 765                                                 rmark(sno, loc, tdb, MWORD, NULL);
 766
 767                                         if (w & FU_SEXT)
 768                                         {
 769                                                 if (eval + 0x10000 >= 0x20000)
 770                                                         goto range;
 771                                         }
 772                                         else
 773                                         {
 774                                                 // Range-check BRA and DBRA
 775                                                 if (w & FU_ISBRA)
 776                                                 {
 777                                                         if (eval + 0x8000 >= 0x10000)
 778                                                         goto range;
 779                                                 }
 780                                                 else if (eval >= 0x10000)
 781                                                         goto range;
 782                                         }
 783                                 }
 784
 785                                 *locp++ = (char)(eval >> 8);
 786                                 *locp = (char)eval;
 787                                 break;
 788                         // Fixup LONG forward references;
 789                         // the long could be unaligned in the section buffer, so be careful
 790                         // (again).
 791                         case FU_LONG:
 792                                 if ((w & FUMASKRISC) == FU_MOVEI)
 793                                 {
 794 #if 0
 795                                         address = loc + 4;
 796
 797                                         if (eattr & DEFINED)
 798                                         {
 799                                                 for(j=0; j<fwindex; j++)
 800                                                 {
 801                                                         if (fwdjump[j] == address)
 802                                                         {
 803                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 804
 805                                                                 if (page_jump)
 806                                                                 {
 807                                                                         if (eval % 4)
 808                                                                         {
 809                                                                                 err_setup();
 810                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 811
 812                                                                                 if (listing > 0)
 813                                                                                         ship_ln(buf);
 814
 815                                                                                 if (err_flag)
 816                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 817                                                                                 else
 818                                                                                         printf("%s\n", buf);
 819                                                                         }
 820                                                                 }
 821                                                                 else
 822                                                                 {
 823                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 824                                                                         {
 825                                                                                 err_setup();
 826                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 827
 828                                                                                 if (listing > 0)
 829                                                                                         ship_ln(buf);
 830
 831                                                                                 if (err_flag)
 832                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 833                                                                                 else
 834                                                                                         printf("%s\n", buf);
 835                                                                         }
 836                                                                 }
 837
 838                                                                 // Clear this jump as it has been checked
 839                                                                 fwdjump[j] = 0;
 840                                                                 j = fwindex;
 841                                                         }
 842                                                 }
 843                                         }
 844 #endif
 845
 846                                         // Long constant in MOVEI # is word-swapped, so fix it here
 847                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 848                                         flags = (MLONG | MMOVEI);
 849                                 }
 850                                 else
 851                                         flags = MLONG;
 852
 853                                 if (!(eattr & DEFINED))
 854                                 {
 855 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
 856                                         rmark(sno, loc, 0, flags, esym);
 857                                 }
 858                                 else if (tdb)
 859                                 {
 860 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 861                                         rmark(sno, loc, tdb, flags, NULL);
 862                                 }
 863 //else
 864 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 865
 866                                 *locp++ = (char)(eval >> 24);
 867                                 *locp++ = (char)(eval >> 16);
 868                                 *locp++ = (char)(eval >> 8);
 869                                 *locp = (char)eval;
 870                                 break;
 871
 872                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 873                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 874                         case FU_QUICK:
 875                                 if (!(eattr & DEFINED))
 876                                 {
 877                                         error("External quick reference");
 878                                         continue;
 879                                 }
 880
 881                                 if (eval < 1 || eval > 8)
 882                                         goto range;
 883
 884                                 *locp |= (eval & 7) << 1;
 885                                 break;
 886
 887                         // Fix up 6502 funny branch
 888                         case FU_6BRA:
 889                                 eval -= (loc + 1);
 890
 891                                 if (eval + 0x80 >= 0x100)
 892                                         goto range;
 893
 894                                 *locp = (char)eval;
 895                                 break;
 896
 897                         default:
 898                                 interror(4);                                 // Bad fixup type
 899                                 // NOTREACHED
 900                         }
 901                         continue;
 902 range:
 903                         error("expression out of range");
 904                 }
 905
 906                 ch = ch->chnext;
 907         }
 908         while (ch != NULL);
 909
 910         return 0;
 911 }
 912