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 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR)\n");
 291 //                      i = 18;
 292 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
 293                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
 294                 }
 295                 else
 296                 {
 297 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR) ELSE\n");
 298 //                      i = 14;
 299                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 300                 }
 301         }
 302         else
 303         {
 304 //printf("AddFixup: !SYMBOL\n");
 305                 attr |= FU_EXPR;
 306
 307                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 308                 {
 309                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 310                                 len++;
 311                 }
 312
 313                 len++;                                                          // Add 1 for ENDEXPR
 314 //              i = (len << 2) + 12;
 315                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
 316         }
 317
 318         // Alloc another fixup chunk for this one to fit in if necessary
 319         if ((fchalloc - fchsize) < i)
 320         {
 321                 p = &sect[cursect];
 322                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 323
 324                 // First fixup chunk in section
 325                 if (sfix == NULL)
 326                 {
 327                         cp->chprev = NULL;
 328                         p->sffix = cp;
 329                 }
 330                 // Add to other chunks
 331                 else
 332                 {
 333                         cp->chprev = sfix;
 334                         sfix->chnext = cp;
 335                         sfix->ch_size = fchsize;
 336                 }
 337
 338                 // Setup fixup chunk and its global vars
 339                 cp->chnext = NULL;
 340                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 341                 fchsize = cp->ch_size = 0;
 342                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 343                 sfix = p->sfix = cp;
 344         }
 345
 346         // Record fixup type, fixup location, and the file number and line number
 347         // the fixup is located at.
 348         *fchptr.wp++ = attr;
 349         *fchptr.lp++ = loc;
 350         *fchptr.wp++ = cfileno;
 351         *fchptr.wp++ = (WORD)curlineno;
 352
 353         // Store postfix expression or pointer to a single symbol, or nothing for a
 354         // mark.
 355         if (attr & FU_EXPR)
 356         {
 357                 *fchptr.wp++ = (WORD)len;
 358
 359                 while (len--)
 360                         *fchptr.lp++ = (LONG)*fexpr++;
 361         }
 362         else
 363         {
 364 //              *fchptr.lp++ = (LONG)fexpr[1];
 365                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 366 //printf("AddFixup: adding symbol (%s) [%08X]\n", symbolPtr[fexpr[1]]->sname, symbolPtr[fexpr[1]]->sattr);
 367         }
 368
 369         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 370         if ((attr & FUMASKRISC) == FU_JR)
 371         {
 372                 if (orgactive)
 373                         *fchptr.lp++ = orgaddr;
 374                 else
 375                         *fchptr.lp++ = 0x00000000;
 376         }
 377
 378         fchsize += i;
 379         return 0;
 380 }
 381
 382
 383 //
 384 // Resolve all fixups
 385 //
 386 int ResolveAllFixups(void)
 387 {
 388         unsigned i;
 389         char buf[EBUFSIZ];
 390
 391         // Make undefined symbols GLOBL
 392         if (glob_flag)
 393                 ForceUndefinedSymbolsGlobal();
 394
 395         DEBUG printf("Resolving TEXT sections...\n");
 396         ResolveFixups(TEXT);
 397         DEBUG printf("Resolving DATA sections...\n");
 398         ResolveFixups(DATA);
 399
 400         return 0;
 401 }
 402
 403
 404 //
 405 // Resolve fixups in a section
 406 //
 407 int ResolveFixups(int sno)
 408 {
 409         PTR fup;                                // Current fixup
 410         WORD * fuend;                   // End of last fixup (in this chunk)
 411         WORD w;                                 // Fixup word (type+modes+flags)
 412         char * locp;                    // Location to fix (in cached chunk)
 413         LONG loc;                               // Location to fixup
 414         VALUE eval;                             // Expression value
 415         WORD eattr;                             // Expression attrib
 416         SYM * esym;                             // External symbol involved in expr
 417         SYM * sy;                               // (Temp) pointer to a symbol
 418         WORD i;                                 // (Temp) word
 419         WORD tdb;                               // eattr & TDB
 420         LONG oaddr;
 421         int reg2;
 422         WORD flags;
 423         unsigned page_jump = 0;
 424         unsigned address = 0;
 425         unsigned j;
 426         char buf[EBUFSIZ];
 427
 428         SECT * sc = &sect[sno];
 429         CHUNK * ch = sc->sffix;
 430
 431         if (ch == NULL)
 432                 return 0;
 433
 434         // "Cache" first chunk
 435         CHUNK * cch = sc->sfcode;
 436
 437         // Can't fixup a section with nothing in it
 438         if (cch == NULL)
 439                 return 0;
 440
 441         do
 442         {
 443                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 444                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
 445
 446                 while (fup.wp < fuend)
 447                 {
 448                         w = *fup.wp++;
 449                         loc = *fup.lp++;
 450                         cfileno = *fup.wp++;
 451                         curlineno = (int)*fup.wp++;
 452 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 453                         // This is based on global vars cfileno, curfname :-P
 454                         // This approach is kinda meh as well. I think we can do better than this.
 455                         SetFilenameForErrorReporting();
 456
 457                         esym = NULL;
 458
 459                         // Search for chunk containing location to fix up; compute a
 460                         // pointer to the location (in the chunk). Often we will find the
 461                         // fixup is in the "cached" chunk, so the linear-search is seldom
 462                         // executed.
 463                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 464                         {
 465                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 466                                 {
 467                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 468                                                 break;
 469                                 }
 470
 471                                 if (cch == NULL)
 472                                 {
 473                                         // Fixup (loc) out of range
 474                                         interror(7);
 475                                         // NOTREACHED
 476                                 }
 477                         }
 478
 479                         locp = cch->chptr + (loc - cch->chloc);
 480                         eattr = 0;
 481
 482                         // Compute expression/symbol value and attribs
 483                         // Complex expression
 484                         if (w & FU_EXPR)
 485                         {
 486                                 i = *fup.wp++;
 487
 488                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 489                                 {
 490                                         fup.lp += i;
 491                                         continue;
 492                                 }
 493
 494                                 fup.lp += i;
 495                         }
 496                         // Simple symbol
 497                         else
 498                         {
 499                                 sy = *fup.sy++;
 500                                 eattr = sy->sattr;
 501
 502                                 if (eattr & DEFINED)
 503                                         eval = sy->svalue;
 504                                 else
 505                                         eval = 0;
 506
 507                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 508                                         esym = sy;
 509 printf("DoFixups: found symbol (%s) [%08X]\n", sy->sname, sy->sattr);
 510                         }
 511
 512                         tdb = (WORD)(eattr & TDB);
 513
 514                         // If the expression is undefined and no external symbol is
 515                         // involved, then it's an error.
 516                         if (!(eattr & DEFINED) && (esym == NULL))
 517                         {
 518                                 error(undef_error);
 519                                 continue;
 520                         }
 521
 522 // It seems that this is completely unnecessary!
 523 #if 0
 524                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
 525 //{
 526 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
 527                                 esym->sattre |= RISCSYM;
 528 //}
 529 #endif
 530
 531                         // Do the fixup
 532                         //
 533                         // If a PC-relative fixup is undefined, its value is *not*
 534                         // subtracted from the location (that will happen in the linker
 535                         // when the external reference is resolved).
 536                         //
 537                         // MWC expects PC-relative things to have the LOC subtracted from
 538                         // the value, if the value is external (that is, undefined at this
 539                         // point).
 540                         //
 541                         // PC-relative fixups must be DEFINED and either in the same
 542                         // section (whereupon the subtraction takes place) or ABS (with no
 543                         // subtract).
 544                         if (w & FU_PCREL)
 545                         {
 546                                 if (eattr & DEFINED)
 547                                 {
 548                                         if (tdb == sno)
 549                                                 eval -= (VALUE)loc;
 550                                         else if (tdb)
 551                                         {
 552                                                 error("PC-relative expr across sections");
 553                                                 continue;
 554                                         }
 555
 556                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 557                                                 warn("unoptimized short branch");
 558                                 }
 559                                 else if (obj_format == MWC)
 560                                         eval -= (VALUE)loc;
 561
 562                                 tdb = 0;
 563                                 eattr &= ~TDB;
 564                         }
 565
 566                         // Do fixup classes
 567                         switch ((int)(w & FUMASK))
 568                         {
 569                         // FU_BBRA fixes up a one-byte branch offset.
 570                         case FU_BBRA:
 571                                 if (!(eattr & DEFINED))
 572                                 {
 573                                         error("external short branch");
 574                                         continue;
 575                                 }
 576
 577                                 eval -= 2;
 578
 579                                 if (eval + 0x80 >= 0x100)
 580                                         goto range;
 581
 582                                 if (eval == 0)
 583                                 {
 584                                         error("illegal bra.s with zero offset");
 585                                         continue;
 586                                 }
 587
 588                                 *++locp = (char)eval;
 589                                 break;
 590                         // Fixup one-byte value at locp + 1.
 591                         case FU_WBYTE:
 592                                 locp++;
 593                                 // FALLTHROUGH
 594                         // Fixup one-byte forward references
 595                         case FU_BYTE:
 596                                 if (!(eattr & DEFINED))
 597                                 {
 598                                         error("external byte reference");
 599                                         continue;
 600                                 }
 601
 602                                 if (tdb)
 603                                 {
 604                                         error("non-absolute byte reference");
 605                                         continue;
 606                                 }
 607
 608                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 609                                         goto range;
 610
 611                                 if (w & FU_SEXT)
 612                                 {
 613                                         if (eval + 0x100 >= 0x200)
 614                                                 goto range;
 615                                 }
 616                                 else if (eval >= 0x100)
 617                                         goto range;
 618
 619                                 *locp = (char)eval;
 620                                 break;
 621                         // Fixup WORD forward references;
 622                         // the word could be unaligned in the section buffer, so we have to
 623                         // be careful.
 624                         case FU_WORD:
 625                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
 626                                 {
 627                                         oaddr = *fup.lp++;
 628
 629                                         if (oaddr)
 630                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 631                                         else
 632                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 633
 634 #if 0
 635                                         if ((w & 0x0F00) == FU_MJR)
 636                                         {
 637                                                 // Main code destination alignment checking here for
 638                                                 // forward declared labels
 639                                                 address = (oaddr) ? oaddr : loc;
 640
 641                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 642                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 643                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 644                                                 {
 645                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 646                                                                 "main memory and local gpu ram", address);
 647                                                 }
 648                                                 else
 649                                                 {
 650                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 651
 652                                                         if (page_jump)
 653                                                         {
 654                                                                 // This jump is to a page outside of the
 655                                                                 // current 256 byte page
 656                                                                 if (eval % 4)
 657                                                                 {
 658                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 659                                                                 }
 660                                                         }
 661                                                         else
 662                                                         {
 663                                                                 // This jump is in the current 256 byte page
 664                                                                 if ((eval - 2) % 4)
 665                                                                 {
 666                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 667                                                                 }
 668                                                         }
 669                                                 }
 670                                         }
 671 #endif
 672
 673                                         if ((reg2 < -16) || (reg2 > 15))
 674                                         {
 675                                                 error("relative jump out of range");
 676                                                 break;
 677                                         }
 678
 679                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 680                                         locp++;
 681                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 682                                         break;
 683                                 }
 684
 685                                 if ((w & FUMASKRISC) == FU_NUM15)
 686                                 {
 687                                         if (eval < -16 || eval > 15)
 688                                         {
 689                                                 error("constant out of range");
 690                                                 break;
 691                                         }
 692
 693                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 694                                         locp++;
 695                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 696                                         break;
 697                                 }
 698
 699                                 if ((w & FUMASKRISC) == FU_NUM31)
 700                                 {
 701                                         if (eval < 0 || eval > 31)
 702                                         {
 703                                                 error("constant out of range");
 704                                                 break;
 705                                         }
 706
 707                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 708                                         locp++;
 709                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 710                                         break;
 711                                 }
 712
 713                                 if ((w & FUMASKRISC) == FU_NUM32)
 714                                 {
 715                                         if (eval < 1 || eval > 32)
 716                                         {
 717                                                 error("constant out of range");
 718                                                 break;
 719                                         }
 720
 721                                         if (w & FU_SUB32)
 722                                                 eval = (32 - eval);
 723
 724                                         eval = (eval == 32) ? 0 : eval;
 725                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 726                                         locp++;
 727                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 728                                         break;
 729                                 }
 730
 731                                 if ((w & FUMASKRISC) == FU_REGONE)
 732                                 {
 733                                         if (eval < 0 || eval > 31)
 734                                         {
 735                                                 error("register value out of range");
 736                                                 break;
 737                                         }
 738
 739                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 740                                         locp++;
 741                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 742                                         break;
 743                                 }
 744
 745                                 if ((w & FUMASKRISC) == FU_REGTWO)
 746                                 {
 747                                         if (eval < 0 || eval > 31)
 748                                         {
 749                                                 error("register value out of range");
 750                                                 break;
 751                                         }
 752
 753                                         locp++;
 754                                         *locp = (char)(*locp | (eval & 0x1F));
 755                                         break;
 756                                 }
 757
 758                                 if (!(eattr & DEFINED))
 759                                 {
 760                                         if (w & FU_PCREL)
 761                                                 w = MPCREL | MWORD;
 762                                         else
 763                                                 w = MWORD;
 764
 765                                         rmark(sno, loc, 0, w, esym);
 766                                 }
 767                                 else
 768                                 {
 769                                         if (tdb)
 770                                                 rmark(sno, loc, tdb, MWORD, NULL);
 771
 772                                         if (w & FU_SEXT)
 773                                         {
 774                                                 if (eval + 0x10000 >= 0x20000)
 775                                                         goto range;
 776                                         }
 777                                         else
 778                                         {
 779                                                 // Range-check BRA and DBRA
 780                                                 if (w & FU_ISBRA)
 781                                                 {
 782                                                         if (eval + 0x8000 >= 0x10000)
 783                                                         goto range;
 784                                                 }
 785                                                 else if (eval >= 0x10000)
 786                                                         goto range;
 787                                         }
 788                                 }
 789
 790                                 *locp++ = (char)(eval >> 8);
 791                                 *locp = (char)eval;
 792                                 break;
 793                         // Fixup LONG forward references;
 794                         // the long could be unaligned in the section buffer, so be careful
 795                         // (again).
 796                         case FU_LONG:
 797                                 if ((w & FUMASKRISC) == FU_MOVEI)
 798                                 {
 799 #if 0
 800                                         address = loc + 4;
 801
 802                                         if (eattr & DEFINED)
 803                                         {
 804                                                 for(j=0; j<fwindex; j++)
 805                                                 {
 806                                                         if (fwdjump[j] == address)
 807                                                         {
 808                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 809
 810                                                                 if (page_jump)
 811                                                                 {
 812                                                                         if (eval % 4)
 813                                                                         {
 814                                                                                 err_setup();
 815                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 816
 817                                                                                 if (listing > 0)
 818                                                                                         ship_ln(buf);
 819
 820                                                                                 if (err_flag)
 821                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 822                                                                                 else
 823                                                                                         printf("%s\n", buf);
 824                                                                         }
 825                                                                 }
 826                                                                 else
 827                                                                 {
 828                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 829                                                                         {
 830                                                                                 err_setup();
 831                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 832
 833                                                                                 if (listing > 0)
 834                                                                                         ship_ln(buf);
 835
 836                                                                                 if (err_flag)
 837                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 838                                                                                 else
 839                                                                                         printf("%s\n", buf);
 840                                                                         }
 841                                                                 }
 842
 843                                                                 // Clear this jump as it has been checked
 844                                                                 fwdjump[j] = 0;
 845                                                                 j = fwindex;
 846                                                         }
 847                                                 }
 848                                         }
 849 #endif
 850
 851                                         // Long constant in MOVEI # is word-swapped, so fix it here
 852                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 853                                         flags = (MLONG | MMOVEI);
 854                                 }
 855                                 else
 856                                         flags = MLONG;
 857
 858                                 if (!(eattr & DEFINED))
 859                                 {
 860 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
 861                                         rmark(sno, loc, 0, flags, esym);
 862                                 }
 863                                 else if (tdb)
 864                                 {
 865 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 866                                         rmark(sno, loc, tdb, flags, NULL);
 867                                 }
 868 //else
 869 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
 870
 871                                 *locp++ = (char)(eval >> 24);
 872                                 *locp++ = (char)(eval >> 16);
 873                                 *locp++ = (char)(eval >> 8);
 874                                 *locp = (char)eval;
 875                                 break;
 876
 877                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 878                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 879                         case FU_QUICK:
 880                                 if (!(eattr & DEFINED))
 881                                 {
 882                                         error("External quick reference");
 883                                         continue;
 884                                 }
 885
 886                                 if (eval < 1 || eval > 8)
 887                                         goto range;
 888
 889                                 *locp |= (eval & 7) << 1;
 890                                 break;
 891
 892                         // Fix up 6502 funny branch
 893                         case FU_6BRA:
 894                                 eval -= (loc + 1);
 895
 896                                 if (eval + 0x80 >= 0x100)
 897                                         goto range;
 898
 899                                 *locp = (char)eval;
 900                                 break;
 901
 902                         default:
 903                                 // Bad fixup type--this should *never* happen!
 904                                 interror(4);
 905                                 // NOTREACHED
 906                         }
 907                         continue;
 908 range:
 909                         error("expression out of range");
 910                 }
 911
 912                 ch = ch->chnext;
 913         }
 914         while (ch != NULL);
 915
 916         return 0;
 917 }
 918