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 "6502.h"
  11 #include "direct.h"
  12 #include "error.h"
  13 #include "expr.h"
  14 #include "listing.h"
  15 #include "mach.h"
  16 #include "mark.h"
  17 #include "riscasm.h"
  18 #include "symbol.h"
  19 #include "token.h"
  20
  21
  22 // Function prototypes
  23 void MakeSection(int, uint16_t);
  24 void SwitchSection(int);
  25
  26 // Section descriptors
  27 SECT sect[NSECTS];              // All sections...
  28 int cursect;                    // Current section number
  29
  30 // These are copied from the section descriptor, the current code chunk
  31 // descriptor and the current fixup chunk descriptor when a switch is made into
  32 // a section.  They are copied back to the descriptors when the section is left.
  33 uint16_t scattr;                // Section attributes
  34 uint32_t sloc;                  // Current loc in section
  35
  36 CHUNK * scode;                  // Current (last) code chunk
  37 uint32_t challoc;               // # bytes alloc'd to code chunk
  38 uint32_t ch_size;               // # bytes used in code chunk
  39 uint8_t * chptr;                // Deposit point in code chunk buffer
  40 uint8_t * chptr_opcode; // Backup of chptr, updated before entering code generators
  41
  42 CHUNK * sfix;                   // Current (last) fixup chunk
  43 uint32_t fchalloc;              // # bytes alloc'd to fixup chunk
  44 uint32_t fchsize;               // # bytes used in fixup chunk
  45 PTR fchptr;                             // Deposit point in fixup chunk buffer
  46
  47 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  48 // associated with a location.
  49 static uint8_t fusiztab[] = {
  50         0,      // FU_QUICK
  51         1,      // FU_BYTE
  52         2,      // FU_WORD
  53         2,      // FU_WBYTE
  54         4,      // FU_LONG
  55         1,      // FU_BBRA
  56         0,      // (unused)
  57         1,      // FU_6BRA
  58 };
  59
  60 // Offset to REAL fixup location
  61 static uint8_t fusizoffs[] = {
  62         0,      // FU_QUICK
  63         0,      // FU_BYTE
  64         0,      // FU_WORD
  65         1,      // FU_WBYTE
  66         0,      // FU_LONG
  67         1,      // FU_BBRA
  68         0,      // (unused)
  69         0,      // FU_6BRA
  70 };
  71
  72
  73 //
  74 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
  75 //
  76 void InitSection(void)
  77 {
  78         int i;
  79
  80         // Cleanup all sections
  81         for(i=0; i<NSECTS; i++)
  82                 MakeSection(i, 0);
  83
  84         // Construct default sections, make TEXT the current section
  85         MakeSection(ABS,  SUSED | SABS | SBSS);         // ABS
  86         MakeSection(TEXT, SUSED | TEXT       );         // TEXT
  87         MakeSection(DATA, SUSED | DATA       );         // DATA
  88         MakeSection(BSS,  SUSED | BSS  | SBSS);         // BSS
  89         MakeSection(M6502, SUSED | TEXT      );         // 6502 code section
  90
  91         // Switch to TEXT for starters
  92         SwitchSection(TEXT);
  93 }
  94
  95
  96 //
  97 // Make a new (clean) section
  98 //
  99 void MakeSection(int sno, uint16_t attr)
 100 {
 101         SECT * p = &sect[sno];
 102         p->scattr = attr;
 103         p->sloc = 0;
 104         p->scode = p->sfcode = NULL;
 105         p->sfix = p->sffix = NULL;
 106 }
 107
 108
 109 //
 110 // Switch to another section (copy section & chunk descriptors to global vars
 111 // for fast access)
 112 //
 113 void SwitchSection(int sno)
 114 {
 115         CHUNK * cp;
 116         cursect = sno;
 117         SECT * p = &sect[sno];
 118
 119     m6502 = (sno == M6502);     // Set 6502-mode flag
 120
 121         // Copy section vars
 122         scattr = p->scattr;
 123         sloc = p->sloc;
 124         scode = p->scode;
 125         sfix = p->sfix;
 126
 127         // Copy code chunk vars
 128         if ((cp = scode) != NULL)
 129         {
 130                 challoc = cp->challoc;
 131                 ch_size = cp->ch_size;
 132                 chptr = cp->chptr + ch_size;
 133
 134                 // For 6502 mode, add the last org'd address
 135                 if (m6502)
 136                         chptr = cp->chptr + orgaddr;
 137         }
 138         else
 139                 challoc = ch_size = 0;
 140
 141         // Copy fixup chunk vars
 142         if ((cp = sfix) != NULL)
 143         {
 144                 fchalloc = cp->challoc;
 145                 fchsize = cp->ch_size;
 146                 fchptr.cp = cp->chptr + fchsize;
 147         }
 148         else
 149                 fchalloc = fchsize = 0;
 150 }
 151
 152
 153 //
 154 // Save current section
 155 //
 156 void SaveSection(void)
 157 {
 158         SECT * p = &sect[cursect];
 159
 160         p->scattr = scattr;                                             // Bailout section vars
 161         p->sloc = sloc;
 162
 163         if (scode != NULL)                                              // Bailout code chunk
 164                 scode->ch_size = ch_size;
 165
 166         if (sfix != NULL)                                               // Bailout fixup chunk
 167                 sfix->ch_size = fchsize;
 168 }
 169
 170
 171 //
 172 // Test to see if a location has a fixup sic'd on it.  This is used by the
 173 // listing generator to print 'xx's instead of '00's for forward references
 174 //
 175 int fixtest(int sno, uint32_t loc)
 176 {
 177         PTR fup;
 178
 179         // Force update to sect[] variables
 180         StopMark();
 181
 182         // Hairy, ugly linear search for a mark on our location; the speed doesn't
 183         // matter, since this is only done when generating a listing, which is
 184         // SLOW.
 185         for(CHUNK * ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
 186         {
 187                 fup.cp = (uint8_t *)ch->chptr;
 188                 uint8_t * fuend = fup.cp + ch->ch_size;
 189
 190                 while (fup.cp < fuend)
 191                 {
 192                         uint16_t w = *fup.wp++;
 193                         uint32_t xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
 194                         fup.wp += 2;
 195
 196                         if (xloc == loc)
 197                                 return (int)fusiztab[w & FUMASK];
 198
 199                         if (w & FU_EXPR)
 200                         {
 201                                 w = *fup.wp++;
 202                                 fup.lp += w;
 203                         }
 204                         else
 205                                 fup.lp++;
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212
 213 //
 214 // Check that there are at least 'amt' bytes left in the current chunk. If
 215 // there are not, allocate another chunk of at least 'amt' bytes (and probably
 216 // more).
 217 //
 218 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 219 //
 220 int chcheck(uint32_t amt)
 221 {
 222         DEBUG { printf("chcheck(%u)\n", amt); }
 223         // If in BSS section, no allocation required
 224         if (scattr & SBSS)
 225                 return 0;
 226
 227         if (!amt)
 228                 amt = CH_THRESHOLD;
 229
 230         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
 231         if ((int)(challoc - ch_size) >= (int)amt)
 232                 return 0;
 233
 234         if (amt < CH_CODE_SIZE)
 235                 amt = CH_CODE_SIZE;
 236
 237         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 238         SECT * p = &sect[cursect];
 239         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 240
 241         // First chunk in section
 242         if (scode == NULL)
 243         {
 244                 cp->chprev = NULL;
 245                 p->sfcode = cp;
 246         }
 247         // Add chunk to other chunks
 248         else
 249         {
 250                 cp->chprev = scode;
 251                 scode->chnext = cp;
 252                 scode->ch_size = ch_size;                       // Save old chunk's globals
 253         }
 254
 255         // Setup chunk and global vars
 256         cp->chloc = sloc;
 257         cp->chnext = NULL;
 258         challoc = cp->challoc = amt;
 259         ch_size = cp->ch_size = 0;
 260         chptr = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
 261         scode = p->scode = cp;
 262
 263         return 0;
 264 }
 265
 266
 267 // This is really wrong. We need to make some proper structures here so we
 268 // don't have to count sizes of objects, that's what the compiler's for! :-P
 269 #define FIXUP_BASE_SIZE (sizeof(uint16_t) + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t))
 270 //
 271 // Arrange for a fixup on a location
 272 //
 273 int AddFixup(uint16_t attr, uint32_t loc, TOKEN * fexpr)
 274 {
 275         uint32_t i;
 276         uint32_t len = 0;
 277         CHUNK * cp;
 278         SECT * p;
 279         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
 280         //         this.
 281 WARNING(!!! AddFixup() is filled with VOODOO !!!)
 282         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
 283
 284         // Compute length of expression (could be faster); determine if it's the
 285         // single-symbol case; no expression if it's just a mark. This code assumes
 286         // 16 bit WORDs and 32 bit LONGs
 287         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
 288         {
 289                 // Just a single symbol
 290                 // SCPCD : correct bit mask for attr (else other FU_xxx will match)
 291                 // NYAN !
 292                 if ((attr & FUMASKRISC) == FU_JR)
 293                 {
 294 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR)\n");
 295 //                      i = 18;
 296 //                      i = FIXUP_BASE_SIZE + (sizeof(uint32_t) * 2);
 297                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(uint32_t);
 298                 }
 299                 else
 300                 {
 301 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR) ELSE\n");
 302 //                      i = 14;
 303                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
 304                 }
 305         }
 306         else
 307         {
 308 //printf("AddFixup: !SYMBOL\n");
 309                 attr |= FU_EXPR;
 310
 311                 for(len=0; fexpr[len]!=ENDEXPR; len++)
 312                 {
 313                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
 314                                 len++;
 315                 }
 316
 317                 len++;                                                          // Add 1 for ENDEXPR
 318 //              i = (len << 2) + 12;
 319                 i = FIXUP_BASE_SIZE + sizeof(uint16_t) + (len * sizeof(TOKEN));
 320         }
 321
 322         // Alloc another fixup chunk for this one to fit in if necessary
 323         if ((fchalloc - fchsize) < i)
 324         {
 325                 p = &sect[cursect];
 326                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
 327
 328                 // First fixup chunk in section
 329                 if (sfix == NULL)
 330                 {
 331                         cp->chprev = NULL;
 332                         p->sffix = cp;
 333                 }
 334                 // Add to other chunks
 335                 else
 336                 {
 337                         cp->chprev = sfix;
 338                         sfix->chnext = cp;
 339                         sfix->ch_size = fchsize;
 340                 }
 341
 342                 // Setup fixup chunk and its global vars
 343                 cp->chnext = NULL;
 344                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
 345                 fchsize = cp->ch_size = 0;
 346                 fchptr.cp = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
 347                 sfix = p->sfix = cp;
 348         }
 349
 350         // Record fixup type, fixup location, and the file number and line number
 351         // the fixup is located at.
 352         *fchptr.wp++ = attr;
 353         *fchptr.lp++ = loc;
 354         *fchptr.wp++ = cfileno;
 355         *fchptr.wp++ = (uint16_t)curlineno;
 356
 357         // Store postfix expression or pointer to a single symbol, or nothing for a
 358         // mark.
 359         if (attr & FU_EXPR)
 360         {
 361                 *fchptr.wp++ = (uint16_t)len;
 362
 363                 while (len--)
 364                         *fchptr.lp++ = (uint32_t)*fexpr++;
 365         }
 366         else
 367         {
 368                 *fchptr.sy++ = symbolPtr[fexpr[1]];
 369 //printf("AddFixup: adding symbol (%s) [%08X]\n", symbolPtr[fexpr[1]]->sname, symbolPtr[fexpr[1]]->sattr);
 370         }
 371
 372         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
 373         if ((attr & FUMASKRISC) == FU_JR)
 374         {
 375                 if (orgactive)
 376                         *fchptr.lp++ = orgaddr;
 377                 else
 378                         *fchptr.lp++ = 0x00000000;
 379         }
 380
 381         fchsize += i;
 382         return 0;
 383 }
 384
 385
 386 //
 387 // Resolve fixups in a section
 388 //
 389 int ResolveFixups(int sno)
 390 {
 391         PTR fup;                                // Current fixup
 392         uint16_t * fuend;               // End of last fixup (in this chunk)
 393         uint16_t w;                             // Fixup word (type+modes+flags)
 394         uint8_t * locp;                 // Location to fix (in cached chunk)
 395         uint32_t loc;                   // Location to fixup
 396         VALUE eval;                             // Expression value
 397         uint16_t eattr;                 // Expression attrib
 398         SYM * esym;                             // External symbol involved in expr
 399         SYM * sy;                               // (Temp) pointer to a symbol
 400         uint16_t i;                             // (Temp) word
 401         uint16_t tdb;                   // eattr & TDB
 402         uint32_t oaddr;
 403         int reg2;
 404         uint16_t flags;
 405
 406         SECT * sc = &sect[sno];
 407         CHUNK * ch = sc->sffix;
 408
 409         if (ch == NULL)
 410                 return 0;
 411
 412         // "Cache" first chunk
 413         CHUNK * cch = sc->sfcode;
 414
 415         // Can't fixup a section with nothing in it
 416         if (cch == NULL)
 417                 return 0;
 418
 419         /*
 420          *  Wire the 6502 segment's size to its allocated size (64K)
 421          */
 422         if (sno == M6502)
 423                 cch->ch_size = cch->challoc;
 424
 425         do
 426         {
 427                 fup.cp = ch->chptr;                                     // fup -> start of chunk
 428                 fuend = (uint16_t *)(fup.cp + ch->ch_size);     // fuend -> end of chunk
 429
 430                 while (fup.wp < fuend)
 431                 {
 432                         w = *fup.wp++;
 433                         loc = *fup.lp++;
 434                         cfileno = *fup.wp++;
 435                         curlineno = (int)*fup.wp++;
 436                         DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
 437
 438                         // This is based on global vars cfileno, curfname :-P
 439                         // This approach is kinda meh as well. I think we can do better
 440                         // than this.
 441                         SetFilenameForErrorReporting();
 442
 443                         esym = NULL;
 444
 445                         // Search for chunk containing location to fix up; compute a
 446                         // pointer to the location (in the chunk). Often we will find the
 447                         // Fixup is in the "cached" chunk, so the linear-search is seldom
 448                         // executed.
 449                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 450                         {
 451                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 452                                 {
 453                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 454                                                 break;
 455                                 }
 456
 457                                 if (cch == NULL)
 458                                 {
 459                                         // Fixup (loc) out of range
 460                                         interror(7);
 461                                         // NOTREACHED
 462                                 }
 463                         }
 464
 465                         locp = cch->chptr + (loc - cch->chloc);
 466                         eattr = 0;
 467
 468                         // Compute expression/symbol value and attribs
 469
 470                         // Complex expression
 471                         if (w & FU_EXPR)
 472                         {
 473                                 i = *fup.wp++;
 474
 475                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
 476                                 {
 477                                         fup.lp += i;
 478                                         continue;
 479                                 }
 480
 481                                 fup.lp += i;
 482                         }
 483                         // Simple symbol
 484                         else
 485                         {
 486                                 sy = *fup.sy++;
 487                                 eattr = sy->sattr;
 488
 489                                 if (eattr & DEFINED)
 490                                         eval = sy->svalue;
 491                                 else
 492                                         eval = 0;
 493
 494                                 // If the symbol is not defined, but global, set esym to sy
 495                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 496                                         esym = sy;
 497                         }
 498
 499                         tdb = (uint16_t)(eattr & TDB);
 500
 501                         // If the expression is undefined and no external symbol is
 502                         // involved, then that's an error.
 503                         if (!(eattr & DEFINED) && (esym == NULL))
 504                         {
 505                                 error(undef_error);
 506                                 continue;
 507                         }
 508
 509                         // Do the fixup
 510                         //
 511                         // If a PC-relative fixup is undefined, its value is *not*
 512                         // subtracted from the location (that will happen in the linker
 513                         // when the external reference is resolved).
 514                         //
 515                         // MWC expects PC-relative things to have the LOC subtracted from
 516                         // the value, if the value is external (that is, undefined at this
 517                         // point).
 518                         //
 519                         // PC-relative fixups must be DEFINED and either in the same
 520                         // section (whereupon the subtraction takes place) or ABS (with no
 521                         // subtract).
 522                         if (w & FU_PCREL)
 523                         {
 524                                 if (eattr & DEFINED)
 525                                 {
 526                                         if (tdb == sno)
 527                                                 eval -= (VALUE)loc;
 528                                         else if (tdb)
 529                                         {
 530                                                 error("PC-relative expr across sections");
 531                                                 continue;
 532                                         }
 533
 534                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
 535                                                 warn("unoptimized short branch");
 536                                 }
 537                                 else if (obj_format == MWC)
 538                                         eval -= (VALUE)loc;
 539
 540                                 tdb = 0;
 541                                 eattr &= ~TDB;
 542                         }
 543
 544                         // Do fixup classes
 545                         switch ((int)(w & FUMASK))
 546                         {
 547                         // FU_BBRA fixes up a one-byte branch offset.
 548                         case FU_BBRA:
 549                                 if (!(eattr & DEFINED))
 550                                 {
 551                                         error("external short branch");
 552                                         continue;
 553                                 }
 554
 555                                 eval -= 2;
 556
 557                                 if (eval + 0x80 >= 0x100)
 558                                         goto rangeErr;
 559
 560                                 if (eval == 0)
 561                                 {
 562                                         error("illegal bra.s with zero offset");
 563                                         continue;
 564                                 }
 565
 566                                 *++locp = (uint8_t)eval;
 567                                 break;
 568                         // Fixup one-byte value at locp + 1.
 569                         case FU_WBYTE:
 570                                 locp++;
 571                                 // FALLTHROUGH
 572                         // Fixup one-byte forward references
 573                         case FU_BYTE:
 574                                 if (!(eattr & DEFINED))
 575                                 {
 576                                         error("external byte reference");
 577                                         continue;
 578                                 }
 579
 580                                 if (tdb)
 581                                 {
 582                                         error("non-absolute byte reference");
 583                                         continue;
 584                                 }
 585
 586                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
 587                                         goto rangeErr;
 588
 589                                 if (w & FU_SEXT)
 590                                 {
 591                                         if (eval + 0x100 >= 0x200)
 592                                                 goto rangeErr;
 593                                 }
 594                                 else if (eval >= 0x100)
 595                                         goto rangeErr;
 596
 597                                 *locp = (uint8_t)eval;
 598                                 break;
 599                         // Fixup high/low byte off word for 6502
 600                         case FU_BYTEH:
 601                                 if (!(eattr & DEFINED))
 602                                 {
 603                                         error("external byte reference");
 604                                         continue;
 605                                 }
 606
 607                                 *locp = (uint8_t)((eval >> 8) & 0xFF);
 608                                 break;
 609                         case FU_BYTEL:
 610                                 if (!(eattr & DEFINED))
 611                                 {
 612                                         error("external byte reference");
 613                                         continue;
 614                                 }
 615
 616                                 *locp = (uint8_t)(eval & 0xFF);
 617                                 break;
 618                         // Fixup WORD forward references;
 619                         // the word could be unaligned in the section buffer, so we have to
 620                         // be careful.
 621                         case FU_WORD:
 622                                 if ((w & FUMASKRISC) == FU_JR)
 623                                 {
 624                                         oaddr = *fup.lp++;
 625
 626                                         if (oaddr)
 627                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
 628                                         else
 629                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
 630
 631                                         if ((reg2 < -16) || (reg2 > 15))
 632                                         {
 633                                                 error("relative jump out of range");
 634                                                 break;
 635                                         }
 636
 637                                         *locp = (uint8_t)(*locp | ((reg2 >> 3) & 0x03));
 638                                         locp++;
 639                                         *locp = (uint8_t)(*locp | ((reg2 & 0x07) << 5));
 640                                         break;
 641                                 }
 642
 643                                 if ((w & FUMASKRISC) == FU_NUM15)
 644                                 {
 645                                         if (eval < -16 || eval > 15)
 646                                         {
 647                                                 error("constant out of range");
 648                                                 break;
 649                                         }
 650
 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_NUM31)
 658                                 {
 659                                         if (eval < 0 || eval > 31)
 660                                         {
 661                                                 error("constant 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_NUM32)
 672                                 {
 673                                         if (eval < 1 || eval > 32)
 674                                         {
 675                                                 error("constant out of range");
 676                                                 break;
 677                                         }
 678
 679                                         if (w & FU_SUB32)
 680                                                 eval = (32 - eval);
 681
 682                                         eval = (eval == 32) ? 0 : eval;
 683                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 684                                         locp++;
 685                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 686                                         break;
 687                                 }
 688
 689                                 if ((w & FUMASKRISC) == FU_REGONE)
 690                                 {
 691                                         if (eval < 0 || eval > 31)
 692                                         {
 693                                                 error("register value out of range");
 694                                                 break;
 695                                         }
 696
 697                                         *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03));
 698                                         locp++;
 699                                         *locp = (uint8_t)(*locp | ((eval & 0x07) << 5));
 700                                         break;
 701                                 }
 702
 703                                 if ((w & FUMASKRISC) == FU_REGTWO)
 704                                 {
 705                                         if (eval < 0 || eval > 31)
 706                                         {
 707                                                 error("register value out of range");
 708                                                 break;
 709                                         }
 710
 711                                         locp++;
 712                                         *locp = (uint8_t)(*locp | (eval & 0x1F));
 713                                         break;
 714                                 }
 715
 716                                 if (!(eattr & DEFINED))
 717                                 {
 718                                         flags = MWORD;
 719
 720                                         if (w & FU_PCREL)
 721                                                 flags |= MPCREL;
 722
 723                                         MarkRelocatable(sno, loc, 0, flags, esym);
 724                                 }
 725                                 else
 726                                 {
 727                                         if (tdb)
 728                                                 MarkRelocatable(sno, loc, tdb, MWORD, NULL);
 729
 730                                         if (w & FU_SEXT)
 731                                         {
 732                                                 if (eval + 0x10000 >= 0x20000)
 733                                                         goto rangeErr;
 734                                         }
 735                                         else
 736                                         {
 737                                                 // Range-check BRA and DBRA
 738                                                 if (w & FU_ISBRA)
 739                                                 {
 740                                                         if (eval + 0x8000 >= 0x10000)
 741                                                         goto rangeErr;
 742                                                 }
 743                                                 else if (eval >= 0x10000)
 744                                                         goto rangeErr;
 745                                         }
 746                                 }
 747
 748                                 // 6502 words are little endian, so handle that here
 749                                 if (sno == M6502)
 750                                         SETLE16(locp, 0, eval)
 751                                 else
 752                                     SETBE16(locp, 0, eval)
 753
 754                                 break;
 755                         // Fixup LONG forward references;
 756                         // the long could be unaligned in the section buffer, so be careful
 757                         // (again).
 758                         case FU_LONG:
 759                                 flags = MLONG;
 760
 761                                 if ((w & FUMASKRISC) == FU_MOVEI)
 762                                 {
 763                                         // Long constant in MOVEI # is word-swapped, so fix it here
 764                                         eval = WORDSWAP32(eval);
 765                                         flags |= MMOVEI;
 766                                 }
 767
 768                                 // If the symbol is undefined, make sure to pass the symbol in
 769                                 // to the MarkRelocatable() function.
 770                                 if (!(eattr & DEFINED))
 771                                         MarkRelocatable(sno, loc, 0, flags, esym);
 772                                 else if (tdb)
 773                                         MarkRelocatable(sno, loc, tdb, flags, NULL);
 774
 775                                 SETBE32(locp, 0, eval);
 776                                 break;
 777
 778                         // Fixup a 3-bit "QUICK" reference in bits 9..1
 779                         // (range of 1..8) in a word. Really bits 1..3 in a byte.
 780                         case FU_QUICK:
 781                                 if (!(eattr & DEFINED))
 782                                 {
 783                                         error("External quick reference");
 784                                         continue;
 785                                 }
 786
 787                                 if (eval < 1 || eval > 8)
 788                                         goto rangeErr;
 789
 790                                 *locp |= (eval & 7) << 1;
 791                                 break;
 792
 793                         // Fix up 6502 funny branch
 794                         case FU_6BRA:
 795                                 eval -= (loc + 1);
 796
 797                                 if (eval + 0x80 >= 0x100)
 798                                         goto rangeErr;
 799
 800                                 *locp = (uint8_t)eval;
 801                                 break;
 802
 803                         default:
 804                                 // Bad fixup type--this should *never* happen!
 805                                 interror(4);
 806                                 // NOTREACHED
 807                         }
 808                         continue;
 809 rangeErr:
 810                         error("expression out of range");
 811                 }
 812
 813                 ch = ch->chnext;
 814         }
 815         while (ch != NULL);
 816
 817         return 0;
 818 }
 819
 820 //
 821 // Resolve all fixups
 822 //
 823 int ResolveAllFixups(void)
 824 {
 825         // Make undefined symbols GLOBL
 826         if (glob_flag)
 827                 ForceUndefinedSymbolsGlobal();
 828
 829         DEBUG printf("Resolving TEXT sections...\n");
 830         ResolveFixups(TEXT);
 831         DEBUG printf("Resolving DATA sections...\n");
 832         ResolveFixups(DATA);
 833         DEBUG printf("Resolving 6502 sections...\n");
 834         ResolveFixups(M6502);           /* fixup 6502 section (if any) */
 835
 836         return 0;
 837 }
 838