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, 2017 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, uint16_t);
  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 uint16_t scattr;                // Section attributes
  33 uint32_t sloc;                  // Current loc in section
  34
  35 CHUNK * scode;                  // Current (last) code chunk
  36 uint32_t challoc;               // # bytes alloc'd to code chunk
  37 uint32_t ch_size;               // # bytes used in code chunk
  38 uint8_t * chptr;                // Deposit point in code chunk buffer
  39 uint8_t * chptr_opcode; // Backup of chptr, updated before entering code generators
  40
  41 CHUNK * sfix;                   // Current (last) fixup chunk
  42 uint32_t fchalloc;              // # bytes alloc'd to fixup chunk
  43 uint32_t fchsize;               // # bytes used in fixup chunk
  44 PTR fchptr;                             // Deposit point in fixup chunk buffer
  45
  46 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  47 // associated with a location.
  48 static uint8_t fusiztab[] = {
  49    0,   // FU_QUICK
  50    1,   // FU_BYTE
  51    2,   // FU_WORD
  52    2,   // FU_WBYTE
  53    4,   // FU_LONG
  54    1,   // FU_BBRA
  55    0,   // (unused)
  56    1,   // FU_6BRA
  57 };
  58
  59 // Offset to REAL fixup location
  60 static uint8_t fusizoffs[] = {
  61    0,   // FU_QUICK
  62    0,   // FU_BYTE
  63    0,   // FU_WORD
  64    1,   // FU_WBYTE
  65    0,   // FU_LONG
  66    1,   // FU_BBRA
  67    0,   // (unused)
  68    0,   // FU_6BRA
  69 };
  70
  71
  72 //
  73 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
  74 //
  75 void InitSection(void)
  76 {
  77         int i;
  78
  79         // Cleanup all sections
  80         for(i=0; i<NSECTS; i++)
  81                 MakeSection(i, 0);
  82
  83         // Construct default sections, make TEXT the current section
  84         MakeSection(ABS,  SUSED | SABS | SBSS);         // ABS
  85         MakeSection(TEXT, SUSED | TEXT       );         // TEXT
  86         MakeSection(DATA, SUSED | DATA       );         // DATA
  87         MakeSection(BSS,  SUSED | BSS  | SBSS);         // BSS
  88 //      MakeSection(M6502, SUSED | TEXT       );                // 6502 code section
  89
  90         // Switch to TEXT for starters
  91         SwitchSection(TEXT);
  92 }
  93
  94
  95 //
  96 // Make a new (clean) section
  97 //
  98 void MakeSection(int sno, uint16_t attr)
  99 {
 100         SECT * p = &sect[sno];
 101         p->scattr = attr;
 102         p->sloc = 0;
 103         p->scode = p->sfcode = NULL;
 104         p->sfix = p->sffix = NULL;
 105 }
 106
 107
 108 //
 109 // Switch to another section (copy section & chunk descriptors to global vars
 110 // for fast access)
 111 //
 112 void SwitchSection(int sno)
 113 {
 114         CHUNK * cp;
 115         cursect = sno;
 116         SECT * p = &sect[sno];
 117
 118         // Copy section vars
 119         scattr = p->scattr;
 120         sloc = p->sloc;
 121         scode = p->scode;
 122         sfix = p->sfix;
 123
 124         // Copy code chunk vars
 125         if ((cp = scode) != NULL)
 126         {
 127                 challoc = cp->challoc;
 128                 ch_size = cp->ch_size;
 129                 chptr = cp->chptr + ch_size;
 130         }
 131         else
 132                 challoc = ch_size = 0;
 133
 134         // Copy fixup chunk vars
 135         if ((cp = sfix) != NULL)
 136         {
 137                 fchalloc = cp->challoc;
 138                 fchsize = cp->ch_size;
 139                 fchptr.cp = cp->chptr + fchsize;
 140         }
 141         else
 142                 fchalloc = fchsize = 0;
 143 }
 144
 145
 146 //
 147 // Save current section
 148 //
 149 void SaveSection(void)
 150 {
 151         SECT * p = &sect[cursect];
 152
 153         p->scattr = scattr;                                             // Bailout section vars
 154         p->sloc = sloc;
 155
 156         if (scode != NULL)                                              // Bailout code chunk
 157                 scode->ch_size = ch_size;
 158
 159         if (sfix != NULL)                                               // Bailout fixup chunk
 160                 sfix->ch_size = fchsize;
 161 }
 162
 163
 164 //
 165 // Test to see if a location has a fixup sic'd on it.  This is used by the
 166 // listing generator to print 'xx's instead of '00's for forward references
 167 //
 168 int fixtest(int sno, uint32_t loc)
 169 {
 170         PTR fup;
 171
 172         // Force update to sect[] variables
 173         StopMark();
 174
 175         // Hairy, ugly linear search for a mark on our location; the speed doesn't
 176         // matter, since this is only done when generating a listing, which is
 177         // SLOW.
 178         for(CHUNK * ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 179         {
 180                 fup.cp = (uint8_t *)ch->chptr;
 181                 uint8_t * fuend = fup.cp + ch->ch_size;
 182
 183                 while (fup.cp < fuend)
 184                 {
 185                         uint16_t w = *fup.wp++;
 186                         uint32_t 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(uint32_t 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 = ((uint8_t *)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
 261 // don't have to count sizes of objects, that's what the compiler's for! :-P
 262 #define FIXUP_BASE_SIZE (sizeof(uint16_t) + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t))
 263 //
 264 // Arrange for a fixup on a location
 265 //
 266 int AddFixup(uint16_t attr, uint32_t loc, TOKEN * fexpr)
 267 {
 268         uint32_t i;
 269         uint32_t len = 0;
 270         CHUNK * cp;
 271         SECT * p;
 272         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
 273         //         this.
 274 WARNING(!!! AddFixup() is filled with VOODOO !!!)
 275         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 276
 277         // Compute length of expression (could be faster); determine if it's the
 278         // single-symbol case; no expression if it's just a mark. This code assumes
 279         // 16 bit WORDs and 32 bit LONGs
 280         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 281         {
 282                 // Just a single symbol
 283                 // SCPCD : correct bit mask for attr (else other FU_xxx will match)
 284                 // NYAN !
 285                 if ((attr & FUMASKRISC) == FU_JR)
 286                 {
 287 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR)\n");
 288 //                      i = 18;
 289 //                      i = FIXUP_BASE_SIZE + (sizeof(uint32_t) * 2);
 290                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(uint32_t);
 291                 }
 292                 else
 293                 {
 294 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR) ELSE\n");
 295 //                      i = 14;
 296                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 297                 }
 298         }
 299         else
 300         {
 301 //printf("AddFixup: !SYMBOL\n");
 302                 attr |= FU_EXPR;
 303
 304                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 305                 {
 306                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 307                                 len++;
 308                 }
 309
 310                 len++;                                                          // Add 1 for ENDEXPR
 311 //              i = (len << 2) + 12;
 312                 i = FIXUP_BASE_SIZE + sizeof(uint16_t) + (len * sizeof(TOKEN));
 313         }
 314
 315         // Alloc another fixup chunk for this one to fit in if necessary
 316         if ((fchalloc - fchsize) < i)
 317         {
 318                 p = &sect[cursect];
 319                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 320
 321                 // First fixup chunk in section
 322                 if (sfix == NULL)
 323                 {
 324                         cp->chprev = NULL;
 325                         p->sffix = cp;
 326                 }
 327                 // Add to other chunks
 328                 else
 329                 {
 330                         cp->chprev = sfix;
 331                         sfix->chnext = cp;
 332                         sfix->ch_size = fchsize;
 333                 }
 334
 335                 // Setup fixup chunk and its global vars
 336                 cp->chnext = NULL;
 337                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 338                 fchsize = cp->ch_size = 0;
 339                 fchptr.cp = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
 340                 sfix = p->sfix = cp;
 341         }
 342
 343         // Record fixup type, fixup location, and the file number and line number
 344         // the fixup is located at.
 345         *fchptr.wp++ = attr;
 346         *fchptr.lp++ = loc;
 347         *fchptr.wp++ = cfileno;
 348         *fchptr.wp++ = (uint16_t)curlineno;
 349
 350         // Store postfix expression or pointer to a single symbol, or nothing for a
 351         // mark.
 352         if (attr & FU_EXPR)
 353         {
 354                 *fchptr.wp++ = (uint16_t)len;
 355
 356                 while (len--)
 357                         *fchptr.lp++ = (uint32_t)*fexpr++;
 358         }
 359         else
 360         {
 361                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 362 //printf("AddFixup: adding symbol (%s) [%08X]\n", symbolPtr[fexpr[1]]->sname, symbolPtr[fexpr[1]]->sattr);
 363         }
 364
 365         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 366         if ((attr & FUMASKRISC) == FU_JR)
 367         {
 368                 if (orgactive)
 369                         *fchptr.lp++ = orgaddr;
 370                 else
 371                         *fchptr.lp++ = 0x00000000;
 372         }
 373
 374         fchsize += i;
 375         return 0;
 376 }
 377
 378
 379 //
 380 // Resolve fixups in a section
 381 //
 382 int ResolveFixups(int sno)
 383 {
 384         PTR fup;                                // Current fixup
 385         uint16_t * fuend;               // End of last fixup (in this chunk)
 386         uint16_t w;                             // Fixup word (type+modes+flags)
 387         uint8_t * locp;                 // Location to fix (in cached chunk)
 388         uint32_t loc;                   // Location to fixup
 389         VALUE eval;                             // Expression value
 390         uint16_t eattr;                 // Expression attrib
 391         SYM * esym;                             // External symbol involved in expr
 392         SYM * sy;                               // (Temp) pointer to a symbol
 393         uint16_t i;                             // (Temp) word
 394         uint16_t tdb;                   // eattr & TDB
 395         uint32_t oaddr;
 396         int reg2;
 397         uint16_t flags;
 398
 399         SECT * sc = &sect[sno];
 400         CHUNK * ch = sc->sffix;
 401
 402         if (ch == NULL)
 403                 return 0;
 404
 405         // "Cache" first chunk
 406         CHUNK * cch = sc->sfcode;
 407
 408         // Can't fixup a section with nothing in it
 409         if (cch == NULL)
 410                 return 0;
 411
 412         do
 413         {
 414                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 415                 fuend = (uint16_t *)(fup.cp + ch->ch_size);     // fuend -> end of chunk
 416
 417                 while (fup.wp < fuend)
 418                 {
 419                         w = *fup.wp++;
 420                         loc = *fup.lp++;
 421                         cfileno = *fup.wp++;
 422                         curlineno = (int)*fup.wp++;
 423                         DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 424
 425                         // This is based on global vars cfileno, curfname :-P
 426                         // This approach is kinda meh as well. I think we can do better
 427                         // than this.
 428                         SetFilenameForErrorReporting();
 429
 430                         esym = NULL;
 431
 432                         // Search for chunk containing location to fix up; compute a
 433                         // pointer to the location (in the chunk). Often we will find the
 434                         // Fixup is in the "cached" chunk, so the linear-search is seldom
 435                         // executed.
 436                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 437                         {
 438                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 439                                 {
 440                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 441                                                 break;
 442                                 }
 443
 444                                 if (cch == NULL)
 445                                 {
 446                                         // Fixup (loc) out of range
 447                                         interror(7);
 448                                         // NOTREACHED
 449                                 }
 450                         }
 451
 452                         locp = cch->chptr + (loc - cch->chloc);
 453                         eattr = 0;
 454
 455                         // Compute expression/symbol value and attribs
 456
 457                         // Complex expression
 458                         if (w & FU_EXPR)
 459                         {
 460                                 i = *fup.wp++;
 461
 462                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 463                                 {
 464                                         fup.lp += i;
 465                                         continue;
 466                                 }
 467
 468                                 fup.lp += i;
 469                         }
 470                         // Simple symbol
 471                         else
 472                         {
 473                                 sy = *fup.sy++;
 474                                 eattr = sy->sattr;
 475
 476                                 if (eattr & DEFINED)
 477                                         eval = sy->svalue;
 478                                 else
 479                                         eval = 0;
 480
 481                                 // If the symbol is not defined, but global, set esym to sy
 482                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 483                                         esym = sy;
 484                         }
 485
 486                         tdb = (uint16_t)(eattr & TDB);
 487
 488                         // If the expression is undefined and no external symbol is
 489                         // involved, then that's an error.
 490                         if (!(eattr & DEFINED) && (esym == NULL))
 491                         {
 492                                 error(undef_error);
 493                                 continue;
 494                         }
 495
 496                         // Do the fixup
 497                         //
 498                         // If a PC-relative fixup is undefined, its value is *not*
 499                         // subtracted from the location (that will happen in the linker
 500                         // when the external reference is resolved).
 501                         //
 502                         // MWC expects PC-relative things to have the LOC subtracted from
 503                         // the value, if the value is external (that is, undefined at this
 504                         // point).
 505                         //
 506                         // PC-relative fixups must be DEFINED and either in the same
 507                         // section (whereupon the subtraction takes place) or ABS (with no
 508                         // subtract).
 509                         if (w & FU_PCREL)
 510                         {
 511                                 if (eattr & DEFINED)
 512                                 {
 513                                         if (tdb == sno)
 514                                                 eval -= (VALUE)loc;
 515                                         else if (tdb)
 516                                         {
 517                                                 error("PC-relative expr across sections");
 518                                                 continue;
 519                                         }
 520
 521                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 522                                                 warn("unoptimized short branch");
 523                                 }
 524                                 else if (obj_format == MWC)
 525                                         eval -= (VALUE)loc;
 526
 527                                 tdb = 0;
 528                                 eattr &= ~TDB;
 529                         }
 530
 531                         // Do fixup classes
 532                         switch ((int)(w & FUMASK))
 533                         {
 534                         // FU_BBRA fixes up a one-byte branch offset.
 535                         case FU_BBRA:
 536                                 if (!(eattr & DEFINED))
 537                                 {
 538                                         error("external short branch");
 539                                         continue;
 540                                 }
 541
 542                                 eval -= 2;
 543
 544                                 if (eval + 0x80 >= 0x100)
 545                                         goto rangeErr;
 546
 547                                 if (eval == 0)
 548                                 {
 549                                         error("illegal bra.s with zero offset");
 550                                         continue;
 551                                 }
 552
 553                                 *++locp = (uint8_t)eval;
 554                                 break;
 555                         // Fixup one-byte value at locp + 1.
 556                         case FU_WBYTE:
 557                                 locp++;
 558                                 // FALLTHROUGH
 559                         // Fixup one-byte forward references
 560                         case FU_BYTE:
 561                                 if (!(eattr & DEFINED))
 562                                 {
 563                                         error("external byte reference");
 564                                         continue;
 565                                 }
 566
 567                                 if (tdb)
 568                                 {
 569                                         error("non-absolute byte reference");
 570                                         continue;
 571                                 }
 572
 573                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 574                                         goto rangeErr;
 575
 576                                 if (w & FU_SEXT)
 577                                 {
 578                                         if (eval + 0x100 >= 0x200)
 579                                                 goto rangeErr;
 580                                 }
 581                                 else if (eval >= 0x100)
 582                                         goto rangeErr;
 583
 584                                 *locp = (uint8_t)eval;
 585                                 break;
 586                         // Fixup WORD forward references;
 587                         // the word could be unaligned in the section buffer, so we have to
 588                         // be careful.
 589                         case FU_WORD:
 590                                 if ((w & FUMASKRISC) == FU_JR)
 591                                 {
 592                                         oaddr = *fup.lp++;
 593
 594                                         if (oaddr)
 595                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 596                                         else
 597                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 598
 599                                         if ((reg2 < -16) || (reg2 > 15))
 600                                         {
 601                                                 error("relative jump out of range");
 602                                                 break;
 603                                         }
 604
 605                                         *locp = (uint8_t)(*locp | ((reg2 >> 3) & 0x03));
 606                                         locp++;
 607                                         *locp = (uint8_t)(*locp | ((reg2 & 0x07) << 5));
 608                                         break;
 609                                 }
 610
 611                                 if ((w & FUMASKRISC) == FU_NUM15)
 612                                 {
 613                                         if (eval < -16 || eval > 15)
 614                                         {
 615                                                 error("constant out of range");
 616                                                 break;
 617                                         }
 618
 619                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 620                                         locp++;
 621                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 622                                         break;
 623                                 }
 624
 625                                 if ((w & FUMASKRISC) == FU_NUM31)
 626                                 {
 627                                         if (eval < 0 || eval > 31)
 628                                         {
 629                                                 error("constant out of range");
 630                                                 break;
 631                                         }
 632
 633                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 634                                         locp++;
 635                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 636                                         break;
 637                                 }
 638
 639                                 if ((w & FUMASKRISC) == FU_NUM32)
 640                                 {
 641                                         if (eval < 1 || eval > 32)
 642                                         {
 643                                                 error("constant out of range");
 644                                                 break;
 645                                         }
 646
 647                                         if (w & FU_SUB32)
 648                                                 eval = (32 - eval);
 649
 650                                         eval = (eval == 32) ? 0 : eval;
 651                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 652                                         locp++;
 653                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 654                                         break;
 655                                 }
 656
 657                                 if ((w & FUMASKRISC) == FU_REGONE)
 658                                 {
 659                                         if (eval < 0 || eval > 31)
 660                                         {
 661                                                 error("register value out of range");
 662                                                 break;
 663                                         }
 664
 665                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 666                                         locp++;
 667                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 668                                         break;
 669                                 }
 670
 671                                 if ((w & FUMASKRISC) == FU_REGTWO)
 672                                 {
 673                                         if (eval < 0 || eval > 31)
 674                                         {
 675                                                 error("register value out of range");
 676                                                 break;
 677                                         }
 678
 679                                         locp++;
 680                                         *locp = (uint8_t)(*locp | (eval & 0x1F));
 681                                         break;
 682                                 }
 683
 684                                 if (!(eattr & DEFINED))
 685                                 {
 686                                         flags = MWORD;
 687
 688                                         if (w & FU_PCREL)
 689                                                 flags |= MPCREL;
 690
 691                                         MarkRelocatable(sno, loc, 0, flags, esym);
 692                                 }
 693                                 else
 694                                 {
 695                                         if (tdb)
 696                                                 MarkRelocatable(sno, loc, tdb, MWORD, NULL);
 697
 698                                         if (w & FU_SEXT)
 699                                         {
 700                                                 if (eval + 0x10000 >= 0x20000)
 701                                                         goto rangeErr;
 702                                         }
 703                                         else
 704                                         {
 705                                                 // Range-check BRA and DBRA
 706                                                 if (w & FU_ISBRA)
 707                                                 {
 708                                                         if (eval + 0x8000 >= 0x10000)
 709                                                         goto rangeErr;
 710                                                 }
 711                                                 else if (eval >= 0x10000)
 712                                                         goto rangeErr;
 713                                         }
 714                                 }
 715
 716                                 SETBE16(locp, 0, eval);
 717                                 break;
 718                         // Fixup LONG forward references;
 719                         // the long could be unaligned in the section buffer, so be careful
 720                         // (again).
 721                         case FU_LONG:
 722                                 flags = MLONG;
 723
 724                                 if ((w & FUMASKRISC) == FU_MOVEI)
 725                                 {
 726                                         // Long constant in MOVEI # is word-swapped, so fix it here
 727                                         eval = WORDSWAP32(eval);
 728                                         flags |= MMOVEI;
 729                                 }
 730
 731                                 // If the symbol is undefined, make sure to pass the symbol in
 732                                 // to the MarkRelocatable() function.
 733                                 if (!(eattr & DEFINED))
 734                                         MarkRelocatable(sno, loc, 0, flags, esym);
 735                                 else if (tdb)
 736                                         MarkRelocatable(sno, loc, tdb, flags, NULL);
 737
 738                                 SETBE32(locp, 0, eval);
 739                                 break;
 740
 741                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 742                         // (range of 1..8) in a word. Really bits 1..3 in a byte.
 743                         case FU_QUICK:
 744                                 if (!(eattr & DEFINED))
 745                                 {
 746                                         error("External quick reference");
 747                                         continue;
 748                                 }
 749
 750                                 if (eval < 1 || eval > 8)
 751                                         goto rangeErr;
 752
 753                                 *locp |= (eval & 7) << 1;
 754                                 break;
 755
 756                         // Fix up 6502 funny branch
 757                         case FU_6BRA:
 758                                 eval -= (loc + 1);
 759
 760                                 if (eval + 0x80 >= 0x100)
 761                                         goto rangeErr;
 762
 763                                 *locp = (uint8_t)eval;
 764                                 break;
 765
 766                         default:
 767                                 // Bad fixup type--this should *never* happen!
 768                                 interror(4);
 769                                 // NOTREACHED
 770                         }
 771                         continue;
 772 rangeErr:
 773                         error("expression out of range");
 774                 }
 775
 776                 ch = ch->chnext;
 777         }
 778         while (ch != NULL);
 779
 780         return 0;
 781 }
 782
 783 //
 784 // Resolve all fixups
 785 //
 786 int ResolveAllFixups(void)
 787 {
 788         // Make undefined symbols GLOBL
 789         if (glob_flag)
 790                 ForceUndefinedSymbolsGlobal();
 791
 792         DEBUG printf("Resolving TEXT sections...\n");
 793         ResolveFixups(TEXT);
 794         DEBUG printf("Resolving DATA sections...\n");
 795         ResolveFixups(DATA);
 796
 797         return 0;
 798 }
 799