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 "error.h"
  11 #include "mach.h"
  12 #include "token.h"
  13 #include "mark.h"
  14 #include "expr.h"
  15 #include "symbol.h"
  16 #include "risca.h"
  17 #include "listing.h"
  18
  19 // Section descriptors
  20 SECT sect[NSECTS];                                              // All sections...
  21 int cursect;                                                    // Current section number
  22
  23 // These are copied from the section descriptor, the current code chunk
  24 // descriptor and the current fixup chunk descriptor when a switch is made into
  25 // a section.  They are copied back to the descriptors when the section is left.
  26 WORD scattr;                                                    // Section attributes
  27 LONG sloc;                                                              // Current loc in section
  28
  29 CHUNK * scode;                                                  // Current (last) code chunk
  30 LONG challoc;                                                   // # bytes alloc'd to code chunk
  31 LONG ch_size;                                                   // # bytes used in code chunk
  32 char * chptr;                                                   // Deposit point in code chunk buffer
  33
  34 CHUNK * sfix;                                                   // Current (last) fixup chunk
  35 LONG fchalloc;                                                  // # bytes alloc'd to fixup chunk
  36 LONG fchsize;                                                   // # bytes used in fixup chunk
  37 PTR fchptr;                                                             // Deposit point in fixup chunk buffer
  38
  39 unsigned fwdjump[MAXFWDJUMPS];                  // forward jump check table
  40 unsigned fwindex = 0;                                   // forward jump index
  41
  42 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  43 // associated with a location.
  44 static char fusiztab[] = {
  45    0,                                           // FU_QUICK
  46    1,                                           // FU_BYTE
  47    2,                                           // FU_WORD
  48    2,                                           // FU_WBYTE
  49    4,                                           // FU_LONG
  50    1,                                           // FU_BBRA
  51    0,                                           // (unused)
  52    1,                                           // FU_6BRA
  53 };
  54
  55 // Offset to REAL fixup location
  56 static char fusizoffs[] = {
  57    0,                                           // FU_QUICK
  58    0,                                           // FU_BYTE
  59    0,                                           // FU_WORD
  60    1,                                           // FU_WBYTE
  61    0,                                           // FU_LONG
  62    1,                                           // FU_BBRA
  63    0,                                           // (unused)
  64    0,                                           // FU_6BRA
  65 };
  66
  67
  68 //
  69 // Make a New (Clean) Section
  70 //
  71 void mksect(int sno, WORD attr)
  72 {
  73         SECT * p;                                                 // Section pointer
  74
  75         p = &sect[sno];
  76         p->scattr = attr;
  77         p->sloc = 0;
  78         p->scode = p->sfcode = NULL;
  79         p->sfix = p->sffix = NULL;
  80 }
  81
  82
  83 //
  84 // Switch to Another Section (Copy Section & Chunk Descriptors to Global Vars
  85 // for Fast Access)
  86 //
  87 void switchsect(int sno)
  88 {
  89         SECT * p;                                                // Section pointer
  90         CHUNK * cp;                                              // Chunk pointer
  91
  92         cursect = sno;
  93         p = &sect[sno];
  94
  95         scattr = p->scattr;                                      // Copy section vars
  96         sloc = p->sloc;
  97         scode = p->scode;
  98         sfix = p->sfix;
  99
 100         if ((cp = scode) != NULL)
 101         {                               // Copy code chunk vars
 102                 challoc = cp->challoc;
 103                 ch_size = cp->ch_size;
 104                 chptr = cp->chptr + ch_size;
 105         }
 106         else
 107                 challoc = ch_size = 0;
 108
 109         if ((cp = sfix) != NULL)
 110         {                                // Copy fixup chunk vars
 111                 fchalloc = cp->challoc;
 112                 fchsize = cp->ch_size;
 113                 fchptr.cp = cp->chptr + fchsize;
 114         }
 115         else
 116                 fchalloc = fchsize = 0;
 117 }
 118
 119
 120 //
 121 // Save Current Section
 122 //
 123 void savsect(void)
 124 {
 125         SECT * p = &sect[cursect];
 126
 127         p->scattr = scattr;                                      // Bailout section vars
 128         p->sloc = sloc;
 129
 130         if (scode != NULL)                                        // Bailout code chunk
 131                 scode->ch_size = ch_size;
 132
 133         if (sfix != NULL)                                         // Bailout fixup chunk
 134                 sfix->ch_size = fchsize;
 135 }
 136
 137
 138 //
 139 // Initialize Sections; Setup initial ABS, TEXT, DATA and BSS sections
 140 //
 141 void init_sect(void)
 142 {
 143         int i;                                                   // Iterator
 144
 145         // Cleanup all sections
 146         for(i=0; i<NSECTS; ++i)
 147                 mksect(i, 0);
 148
 149         // Construct default sections, make TEXT the current section
 150         mksect(ABS,   SUSED|SABS|SBSS);                          // ABS
 151         mksect(TEXT,  SUSED|TEXT     );                          // TEXT
 152         mksect(DATA,  SUSED|DATA     );                          // DATA
 153         mksect(BSS,   SUSED|BSS |SBSS);                          // BSS
 154 //      mksect(M6502, SUSED|TEXT     );                          // 6502 code section
 155
 156         switchsect(TEXT);                                        // Switch to TEXT for starters
 157 }
 158
 159
 160 //
 161 // Test to see if a location has a fixup sic'd on it.  This is used by the
 162 // listing generator to print 'xx's instead of '00's for forward references
 163 //
 164 int fixtest(int sno, LONG loc)
 165 {
 166         CHUNK * ch;
 167         PTR fup;
 168         char * fuend;
 169         WORD w;
 170         LONG xloc;
 171
 172         stopmark();                                              // Force update to sect[] variables
 173
 174         // Hairy, ugly linear search for a mark on our location;
 175         // the speed doesn't matter, since this is only done when generating a listing, which is SLOW.
 176         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 177         {
 178                 fup.cp = (char *)ch->chptr;
 179                 fuend = fup.cp + ch->ch_size;
 180
 181                 while (fup.cp < fuend)
 182                 {
 183                         w = *fup.wp++;
 184                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 185                         fup.wp += 2;
 186
 187                         if (xloc == loc)
 188                                 return (int)fusiztab[w & FUMASK];
 189
 190                         if (w & FU_EXPR)
 191                         {
 192                                 w = *fup.wp++;
 193                                 fup.lp += w;
 194                         }
 195                         else
 196                                 ++fup.lp;
 197                 }
 198         }
 199
 200         return 0;
 201 }
 202
 203
 204 //
 205 // Check that there are at least `amt' bytes left in the current chunk. If
 206 // there are not, allocate another chunk of at least `amt' bytes (and probably
 207 // more).
 208 //
 209 // If `amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 210 //
 211 int chcheck(LONG amt)
 212 {
 213         CHUNK * cp;
 214         SECT * p;
 215
 216         if (scattr & SBSS)
 217                 return 0;                                                       // If in BSS section, forget it
 218
 219         if (!amt)
 220                 amt = CH_THRESHOLD;
 221
 222         if ((int)(challoc - ch_size) >= (int)amt)
 223                 return 0;
 224
 225         if (amt < CH_CODE_SIZE)
 226                 amt = CH_CODE_SIZE;
 227
 228         p = &sect[cursect];
 229         cp = (CHUNK *)malloc(sizeof(CHUNK) + amt);
 230
 231         // First chunk in section
 232         if (scode == NULL)
 233         {
 234                 cp->chprev = NULL;
 235                 p->sfcode = cp;
 236         }
 237         // Add chunk to other chunks
 238         else
 239         {
 240                 cp->chprev = scode;
 241                 scode->chnext = cp;
 242                 scode->ch_size = ch_size;                       // Save old chunk's globals
 243         }
 244
 245         // Setup chunk and global vars
 246         cp->chloc = sloc;
 247         cp->chnext = NULL;
 248         challoc = cp->challoc = amt;
 249         ch_size = cp->ch_size = 0;
 250         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 251         scode = p->scode = cp;
 252
 253         return 0;
 254 }
 255
 256
 257 //
 258 // Arrange for a fixup on a location
 259 //
 260 int fixup(WORD attr, LONG loc, TOKEN * fexpr)
 261 {
 262         LONG i;
 263         LONG len = 0;
 264         CHUNK * cp;
 265         SECT * p;
 266
 267         // Compute length of expression (could be faster); determine if it's the
 268         // single-symbol case; no expression if it's just a mark. This code assumes
 269         // 16 bit WORDs and 32 bit LONGs
 270         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 271         {
 272                 if ((attr & 0x0F00) == FU_JR) // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 273                 {
 274                         i = 18;                                                 // Just a single symbol
 275                 }
 276                 else
 277                 {
 278                         i = 14;
 279                 }
 280         }
 281         else
 282         {
 283                 attr |= FU_EXPR;
 284
 285                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 286                 {
 287                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 288                                 len++;
 289                 }
 290
 291                 len++;                                                          // Add 1 for ENDEXPR
 292                 i = (len << 2) + 12;
 293         }
 294
 295         // Maybe alloc another fixup chunk for this one to fit in
 296         if ((fchalloc - fchsize) < i)
 297         {
 298                 p = &sect[cursect];
 299 //              cp = (CHUNK *)amem((long)(sizeof(CHUNK) + CH_FIXUP_SIZE));
 300                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 301
 302                 if (sfix == NULL)
 303                 {                                 // First fixup chunk in section
 304                         cp->chprev = NULL;
 305                         p->sffix = cp;
 306                 }
 307                 else
 308                 {                                           // Add to other chunks
 309                         cp->chprev = sfix;
 310                         sfix->chnext = cp;
 311                         sfix->ch_size = fchsize;
 312                 }
 313
 314                 // Setup fixup chunk and its global vars
 315                 cp->chnext = NULL;
 316                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 317                 fchsize = cp->ch_size = 0;
 318                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
 319                 sfix = p->sfix = cp;
 320         }
 321
 322         // Record fixup type, fixup location, and the file number and line number the fixup is
 323         // located at.
 324         *fchptr.wp++ = attr;
 325         *fchptr.lp++ = loc;
 326         *fchptr.wp++ = cfileno;
 327         *fchptr.wp++ = (WORD)curlineno;
 328
 329         // Store postfix expression or pointer to a single symbol, or nothing for a mark.
 330         if (attr & FU_EXPR)
 331         {
 332                 *fchptr.wp++ = (WORD)len;
 333
 334                 while (len--)
 335                         *fchptr.lp++ = (LONG)*fexpr++;
 336         }
 337         else
 338         {
 339                 *fchptr.lp++ = (LONG)fexpr[1];
 340         }
 341
 342         if ((attr & 0x0F00) == FU_JR)  // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 343         {
 344                 if (orgactive)
 345                         *fchptr.lp++ = orgaddr;
 346                 else
 347                         *fchptr.lp++ = 0x00000000;
 348         }
 349
 350         fchsize += i;
 351         return 0;
 352 }
 353
 354
 355 //
 356 // Resolve all Fixups
 357 //
 358 int fixups(void)
 359 {
 360         unsigned i;
 361         char buf[EBUFSIZ];
 362
 363         // Make undefined symbols GLOBL
 364         if (glob_flag)
 365                 syg_fix();
 366
 367         resfix(TEXT);
 368         resfix(DATA);
 369
 370         // We need to do a final check of forward 'jump' destination addresses that are external
 371         for(i=0; i<MAXFWDJUMPS; i++)
 372         {
 373                 if (fwdjump[i])
 374                 {
 375                         err_setup();
 376                         sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and cannot have its aligment validated", fwdjump[i]);
 377
 378                         if (listing > 0)
 379                                 ship_ln(buf);
 380
 381                         if (err_flag)
 382                                 write(err_fd, buf, (LONG)strlen(buf));
 383                         else
 384                                 printf("%s\n", buf);
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391
 392 //
 393 // Resolve Fixups in a Section
 394 //
 395 int resfix(int sno)
 396 {
 397         SECT * sc;                                      // Section
 398         CHUNK * ch;
 399         PTR fup;                                        // Current fixup
 400         WORD * fuend;                           // End of last fixup (in this chunk)
 401         CHUNK * cch;                            // Cached chunk for target
 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         sc = &sect[sno];
 420         ch = sc->sffix;
 421
 422         if (ch == NULL)
 423                 return 0;
 424
 425         cch = sc->sfcode;                                        // "cache" first chunk
 426
 427         if (cch == NULL)                                          // Can't fixup a sect with nothing in it
 428                 return 0;
 429
 430         do
 431         {
 432                 fup.cp = ch->chptr;                                   // fup -> start of chunk
 433                 fuend = (WORD *)(fup.cp + ch->ch_size);               // fuend -> end of chunk
 434
 435                 while (fup.wp < fuend)
 436                 {
 437                         w = *fup.wp++;
 438                         loc = *fup.lp++;
 439                         cfileno = *fup.wp++;
 440                         curlineno = (int)*fup.wp++;
 441
 442                         esym = NULL;
 443
 444                         // Search for chunk containing location to fix up; compute a pointer to the location
 445                         // (in the chunk). Often we will find the fixup is in the "cached" chunk, so the
 446                         // linear-search is seldom executed.
 447                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 448                         {
 449                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 450                                 {
 451                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 452                                                 break;
 453                                 }
 454
 455                                 if (cch == NULL)
 456                                 {
 457                                         interror(7);                                 // Fixup (loc) out of range
 458                                         // NOTREACHED
 459                                 }
 460                         }
 461
 462                         locp = cch->chptr + (loc - cch->chloc);
 463
 464                         eattr = 0;
 465
 466                         // Compute expression/symbol value and attribs
 467                         if (w & FU_EXPR)
 468                         {                                  // Complex expression
 469                                 i = *fup.wp++;
 470
 471                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 472                                 {
 473                                         fup.lp += i;
 474                                         continue;
 475                                 }
 476
 477                                 fup.lp += i;
 478                         }
 479                         else
 480                         {                                           // Simple symbol
 481                                 sy = *fup.sy++;
 482                                 eattr = sy->sattr;
 483
 484                                 if (eattr & DEFINED)
 485                                         eval = sy->svalue;
 486                                 else
 487                                         eval = 0;
 488
 489                                 if ((eattr & (GLOBAL|DEFINED)) == GLOBAL)
 490                                         esym = sy;
 491                         }
 492
 493                         tdb = (WORD)(eattr & TDB);
 494
 495                         // If the expression is undefined and no external symbol is
 496                         // involved, then it's an error.
 497                         if (!(eattr & DEFINED) && esym == NULL)
 498                         {
 499                                 error(undef_error);
 500                                 continue;
 501                         }
 502
 503                         if (((w & 0x0F00) == FU_MOVEI) && esym)
 504                                 esym->sattre |= RISCSYM;
 505
 506                         // Do the fixup
 507                         //
 508                         // If a PC-relative fixup is undefined, its value is *not* subtracted from the location
 509                         // (that will happen in the linker when the external reference is resolved).
 510                         //
 511                         // MWC expects PC-relative things to have the LOC subtracted from the value, if the
 512                         // value is external (that is, undefined at this point).
 513                         //
 514                         // PC-relative fixups must be DEFINED and either in the same section (whereupon the
 515                         // subtraction takes place) or ABS (with no subtract).
 516                         if (w & FU_PCREL)
 517                         {
 518                                 if (eattr & DEFINED)
 519                                 {
 520                                         if (tdb == sno)
 521                                                 eval -= (VALUE)loc;
 522                                         else if (tdb)
 523                                         {
 524                                                 error("PC-relative expr across sections");
 525                                                 continue;
 526                                         }
 527
 528                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 529                                                 warn("unoptimized short branch");
 530                                 }
 531                                 else if (obj_format == MWC)
 532                                         eval -= (VALUE)loc;
 533
 534                                 tdb = 0;
 535                                 eattr &= ~TDB;
 536                         }
 537
 538                         // Do fixup classes
 539                         switch ((int)(w & FUMASK))
 540                         {
 541                         // FU_BBRA fixes up a one-byte branch offset.
 542                         case FU_BBRA:
 543                                 if (!(eattr & DEFINED))
 544                                 {
 545                                         error("external short branch");
 546                                         continue;
 547                                 }
 548
 549                                 eval -= 2;
 550
 551                                 if (eval + 0x80 >= 0x100)
 552                                         goto range;
 553
 554                                 if (eval == 0)
 555                                 {
 556                                         error("illegal bra.s with zero offset");
 557                                         continue;
 558                                 }
 559
 560                                 *++locp = (char)eval;
 561                                 break;
 562                         // Fixup one-byte value at locp + 1.
 563                         case FU_WBYTE:
 564                                 ++locp;
 565                                 // FALLTHROUGH
 566                         // Fixup one-byte forward references
 567                         case FU_BYTE:
 568                                 if (!(eattr & DEFINED))
 569                                 {
 570                                         error("external byte reference");
 571                                         continue;
 572                                 }
 573
 574                                 if (tdb)
 575                                 {
 576                                         error("non-absolute byte reference");
 577                                         continue;
 578                                 }
 579
 580                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 581                                         goto range;
 582
 583                                 if (w & FU_SEXT)
 584                                 {
 585                                         if (eval + 0x100 >= 0x200)
 586                                                 goto range;
 587                                 }
 588                                 else if (eval >= 0x100)
 589                                         goto range;
 590
 591                                 *locp = (char)eval;
 592                                 break;
 593                         // Fixup WORD forward references;
 594                         // the word could be unaligned in the section buffer, so we have to be careful.
 595                         case FU_WORD:
 596                                 if (((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR))
 597                                 {
 598                                         oaddr = *fup.lp++;
 599
 600                                         if (oaddr)
 601                                         {
 602                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 603                                         }
 604                                         else
 605                                         {
 606                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 607                                         }
 608
 609                                         if ((w & 0x0F00) == FU_MJR)
 610                                         {
 611                                                 // Main code destination alignment checking here for forward declared labels
 612                                                 address = (oaddr) ? oaddr : loc;
 613
 614                                                 if (((address >= 0xF03000) && (address < 0xF04000)
 615                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
 616                                                         && (eval < 0xF04000) && (address < 0xF03000)))
 617                                                 {
 618                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
 619                                                                 "main memory and local gpu ram", address);
 620                                                 }
 621                                                 else
 622                                                 {
 623                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 624
 625                                                         if (page_jump)
 626                                                         {
 627                                                                 // This jump is to a page outside of the current 256 byte page
 628                                                                 if (eval % 4)
 629                                                                 {
 630                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 631                                                                 }
 632                                                         }
 633                                                         else
 634                                                         {
 635                                                                 // This jump is in the current 256 byte page
 636                                                                 if ((eval - 2) % 4)
 637                                                                 {
 638                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 639                                                                 }
 640                                                         }
 641                                                 }
 642                                         }
 643
 644                                         if ((reg2 < -16) || (reg2 > 15))
 645                                         {
 646                                                 error("relative jump out of range");
 647                                                 break;
 648                                         }
 649
 650                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
 651                                         locp++;
 652                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
 653                                         break;
 654                                 }
 655
 656                                 if ((w & 0x0F00) == FU_NUM15)
 657                                 {
 658                                         if (eval < -16 || eval > 15)
 659                                         {
 660                                                 error("constant out of range");
 661                                                 break;
 662                                         }
 663
 664                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 665                                         locp++;
 666                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 667                                         break;
 668                                 }
 669
 670                                 if ((w & 0x0F00) == FU_NUM31)
 671                                 {
 672                                         if (eval < 0 || eval > 31)
 673                                         {
 674                                                 error("constant out of range");
 675                                                 break;
 676                                         }
 677
 678                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 679                                         locp++;
 680                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 681                                         break;
 682                                 }
 683
 684                                 if ((w & 0x0F00) == FU_NUM32)
 685                                 {
 686                                         if (eval < 1 || eval > 32)
 687                                         {
 688                                                 error("constant out of range");
 689                                                 break;
 690                                         }
 691
 692                                         if (w & FU_SUB32)
 693                                                 eval = (32 - eval);
 694
 695                                         eval = (eval == 32) ? 0 : eval;
 696                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 697                                         locp++;
 698                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 699                                         break;
 700                                 }
 701
 702                                 if ((w & 0x0F00) == FU_REGONE)
 703                                 {
 704                                         if (eval < 0 || eval > 31)
 705                                         {
 706                                                 error("register value out of range");
 707                                                 break;
 708                                         }
 709
 710                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
 711                                         locp++;
 712                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
 713                                         break;
 714                                 }
 715
 716                                 if ((w & 0x0F00) == FU_REGTWO)
 717                                 {
 718                                         if (eval < 0 || eval > 31)
 719                                         {
 720                                                 error("register value out of range");
 721                                                 break;
 722                                         }
 723
 724                                         locp++;
 725                                         *locp = (char)(*locp | (eval & 0x1F));
 726                                         break;
 727                                 }
 728
 729                                 if (!(eattr & DEFINED))
 730                                 {
 731                                         if (w & FU_PCREL)
 732                                                 w = MPCREL | MWORD;
 733                                         else
 734                                                 w = MWORD;
 735
 736                                         rmark(sno, loc, 0, w, esym);
 737                                 }
 738                                 else
 739                                 {
 740                                         if (tdb)
 741                                                 rmark(sno, loc, tdb, MWORD, NULL);
 742
 743                                         if (w & FU_SEXT)
 744                                         {
 745                                                 if (eval + 0x10000 >= 0x20000)
 746                                                         goto range;
 747                                         }
 748                                         else
 749                                         {
 750                                                 // Range-check BRA and DBRA
 751                                                 if (w & FU_ISBRA)
 752                                                 {
 753                                                         if (eval + 0x8000 >= 0x10000)
 754                                                         goto range;
 755                                                 }
 756                                                 else if (eval >= 0x10000)
 757                                                         goto range;
 758                                         }
 759                                 }
 760
 761                                 *locp++ = (char)(eval >> 8);
 762                                 *locp = (char)eval;
 763                                 break;
 764                         // Fixup LONG forward references;
 765                         // the long could be unaligned in the section buffer, so be careful (again).
 766                         case FU_LONG:
 767                                 if ((w & 0x0F00) == FU_MOVEI)
 768                                 {
 769                                         address = loc + 4;
 770
 771                                         if (eattr & DEFINED)
 772                                         {
 773                                                 for(j=0; j<fwindex; j++)
 774                                                 {
 775                                                         if (fwdjump[j] == address)
 776                                                         {
 777                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
 778
 779                                                                 if (page_jump)
 780                                                                 {
 781                                                                         if (eval % 4)
 782                                                                         {
 783                                                                                 err_setup();
 784                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
 785
 786                                                                                 if (listing > 0)
 787                                                                                         ship_ln(buf);
 788
 789                                                                                 if (err_flag)
 790                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 791                                                                                 else
 792                                                                                         printf("%s\n", buf);
 793                                                                         }
 794                                                                 }
 795                                                                 else
 796                                                                 {
 797                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
 798                                                                         {
 799                                                                                 err_setup();
 800                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
 801
 802                                                                                 if (listing > 0)
 803                                                                                         ship_ln(buf);
 804
 805                                                                                 if (err_flag)
 806                                                                                         write(err_fd, buf, (LONG)strlen(buf));
 807                                                                                 else
 808                                                                                         printf("%s\n", buf);
 809                                                                         }
 810                                                                 }
 811
 812                                                                 // Clear this jump as it has been checked
 813                                                                 fwdjump[j] = 0;
 814                                                                 j = fwindex;
 815                                                         }
 816                                                 }
 817                                         }
 818
 819                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 820                                         flags = (MLONG|MMOVEI);
 821                                 }
 822                                 else
 823                                         flags = MLONG;
 824
 825                                 if (!(eattr & DEFINED))
 826                                 {
 827                                         rmark(sno, loc, 0, flags, esym);
 828                                 }
 829                                 else if (tdb)
 830                                 {
 831                                         rmark(sno, loc, tdb, flags, NULL);
 832                                 }
 833
 834                                 *locp++ = (char)(eval >> 24);
 835                                 *locp++ = (char)(eval >> 16);
 836                                 *locp++ = (char)(eval >> 8);
 837                                 *locp = (char)eval;
 838                                 break;
 839                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 840                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
 841                         case FU_QUICK:
 842                                 if (!(eattr & DEFINED))
 843                                 {
 844                                         error("External quick reference");
 845                                         continue;
 846                                 }
 847
 848                                 if (eval < 1 || eval > 8)
 849                                         goto range;
 850
 851                                 *locp |= (eval & 7) << 1;
 852                                 break;
 853                         // Fix up 6502 funny branch
 854                         case FU_6BRA:
 855                                 eval -= (loc + 1);
 856
 857                                 if (eval + 0x80 >= 0x100)
 858                                         goto range;
 859
 860                                 *locp = (char)eval;
 861                                 break;
 862                         default:
 863                                 interror(4);                                 // Bad fixup type
 864                                 // NOTREACHED
 865                         }
 866                         continue;
 867 range:
 868                         error("expression out of range");
 869                 }
 870
 871                 ch = ch->chnext;
 872         }
 873         while (ch != NULL);
 874
 875         return 0;
 876 }