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