Shamusworld >> Repos - rmac/blob - sect.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for all Atari computers
   3 // SECT.C - Code Generation, Fixups and Section Management
   4 // Copyright (C) 199x Landon Dyer, 2011-2019 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 "dsp56k.h"
  13 #include "error.h"
  14 #include "expr.h"
  15 #include "listing.h"
  16 #include "mach.h"
  17 #include "mark.h"
  18 #include "riscasm.h"
  19 #include "symbol.h"
  20 #include "token.h"
  21
  22
  23 // Function prototypes
  24 void MakeSection(int, uint16_t);
  25 void SwitchSection(int);
  26
  27 // Section descriptors
  28 SECT sect[NSECTS];              // All sections...
  29 int cursect;                    // Current section number
  30
  31 // These are copied from the section descriptor, the current code chunk
  32 // descriptor and the current fixup chunk descriptor when a switch is made into
  33 // a section. They are copied back to the descriptors when the section is left.
  34 uint16_t scattr;                // Section attributes
  35 uint32_t sloc;                  // Current loc in section
  36
  37 CHUNK * scode;                  // Current (last) code chunk
  38 uint32_t challoc;               // # bytes alloc'd to code chunk
  39 uint32_t ch_size;               // # bytes used in code chunk
  40 uint8_t * chptr;                // Deposit point in code chunk buffer
  41 uint8_t * chptr_opcode; // Backup of chptr, updated before entering code generators
  42
  43 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
  44 // associated with a location.
  45 static uint8_t fusiztab[] = {
  46         0,      // FU_QUICK
  47         1,      // FU_BYTE
  48         2,      // FU_WORD
  49         2,      // FU_WBYTE
  50         4,      // FU_LONG
  51         1,      // FU_BBRA
  52         0,      // (unused)
  53         1,      // FU_6BRA
  54 };
  55
  56 // Offset to REAL fixup location
  57 static uint8_t fusizoffs[] = {
  58         0,      // FU_QUICK
  59         0,      // FU_BYTE
  60         0,      // FU_WORD
  61         1,      // FU_WBYTE
  62         0,      // FU_LONG
  63         1,      // FU_BBRA
  64         0,      // (unused)
  65         0,      // FU_6BRA
  66 };
  67
  68
  69 //
  70 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
  71 //
  72 void InitSection(void)
  73 {
  74         // Initialize all sections
  75         for(int i=0; i<NSECTS; i++)
  76                 MakeSection(i, 0);
  77
  78         // Construct default sections, make TEXT the current section
  79         MakeSection(ABS,     SUSED | SABS | SBSS);      // ABS
  80         MakeSection(TEXT,    SUSED | TEXT       );      // TEXT
  81         MakeSection(DATA,    SUSED | DATA       );      // DATA
  82         MakeSection(BSS,     SUSED | BSS  | SBSS);      // BSS
  83         MakeSection(M6502,   SUSED | TEXT       );      // 6502 code section
  84         MakeSection(M56001P, SUSED | SABS       );      // DSP 56001 Program RAM
  85         MakeSection(M56001X, SUSED | SABS       );      // DSP 56001 X RAM
  86         MakeSection(M56001Y, SUSED | SABS       );      // DSP 56001 Y RAM
  87
  88         // Switch to TEXT for starters
  89         SwitchSection(TEXT);
  90 }
  91
  92
  93 //
  94 // Make a new (clean) section
  95 //
  96 void MakeSection(int sno, uint16_t attr)
  97 {
  98         SECT * sp = &sect[sno];
  99         sp->scattr = attr;
 100         sp->sloc = 0;
 101         sp->orgaddr = 0;
 102         sp->scode = sp->sfcode = NULL;
 103         sp->sfix = sp->sffix = NULL;
 104 }
 105
 106
 107 //
 108 // Switch to another section (copy section & chunk descriptors to global vars
 109 // for fast access)
 110 //
 111 void SwitchSection(int sno)
 112 {
 113         CHUNK * cp;
 114         cursect = sno;
 115         SECT * sp = &sect[sno];
 116
 117         m6502 = (sno == M6502); // Set 6502-mode flag
 118
 119         // Copy section vars
 120         scattr = sp->scattr;
 121         sloc = sp->sloc;
 122         scode = sp->scode;
 123         orgaddr = sp->orgaddr;
 124
 125         // Copy code chunk vars
 126         if ((cp = scode) != NULL)
 127         {
 128                 challoc = cp->challoc;
 129                 ch_size = cp->ch_size;
 130                 chptr = cp->chptr + ch_size;
 131
 132                 // For 6502 mode, add the last org'd address
 133 // Why?
 134 /*
 135 Because the way this is set up it treats the 6502 assembly space as a single 64K space (+ 16 bytes, for some unknown reason) and just bobbles around inside that space and uses a stack of org "pointers" to show where the data ended up.
 136
 137 This is a shitty way to handle things, and we can do better than this!  :-P
 138
 139 Really, there's no reason to have the 6502 (or DSP56001 for that matter) have their own private sections for this kind of thing, as there's literally *no* chance that it would be mingled with 68K+ code.  It should be able to use the TEXT, DATA & BSS sections just like the 68K.
 140
 141 Or should it?  After looking at the code, maybe it's better to keep the 56001 sections segregated from the rest.  But we can still make the 6502 stuff better.
 142 */
 143                 if (m6502)
 144                         chptr = cp->chptr + orgaddr;
 145         }
 146         else
 147                 challoc = ch_size = 0;
 148 }
 149
 150
 151 //
 152 // Save current section
 153 //
 154 void SaveSection(void)
 155 {
 156         SECT * sp = &sect[cursect];
 157
 158         sp->scattr = scattr;                    // Bailout section vars
 159         sp->sloc = sloc;
 160         sp->orgaddr = orgaddr;
 161
 162         if (scode != NULL)                              // Bailout code chunk (if any)
 163                 scode->ch_size = ch_size;
 164 }
 165
 166
 167 //
 168 // Test to see if a location has a fixup set on it. This is used by the
 169 // listing generator to print 'xx's instead of '00's for forward references
 170 //
 171 int fixtest(int sno, uint32_t loc)
 172 {
 173         // Force update to sect[] variables
 174         StopMark();
 175
 176         // Ugly linear search for a mark on our location. The speed doesn't
 177         // matter, since this is only done when generating a listing, which is
 178         // SLOW anyway.
 179         for(FIXUP * fp=sect[sno].sffix; fp!=NULL; fp=fp->next)
 180         {
 181                 uint32_t w = fp->attr;
 182                 uint32_t xloc = fp->loc + (int)fusizoffs[w & FUMASK];
 183
 184                 if (xloc == loc)
 185                         return (int)fusiztab[w & FUMASK];
 186         }
 187
 188         return 0;
 189 }
 190
 191
 192 //
 193 // Check that there are at least 'amt' bytes left in the current chunk. If
 194 // there are not, allocate another chunk of at least CH_CODE_SIZE bytes or
 195 // 'amt', whichever is larger.
 196 //
 197 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
 198 //
 199 void chcheck(uint32_t amt)
 200 {
 201         DEBUG { printf("chcheck(%u)\n", amt); }
 202
 203         // If in BSS section, no allocation required
 204         if (scattr & SBSS)
 205                 return;
 206
 207         if (amt == 0)
 208                 amt = CH_THRESHOLD;
 209
 210         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc - ch_size); }
 211
 212         if ((int)(challoc - ch_size) >= (int)amt)
 213                 return;
 214
 215         if (amt < CH_CODE_SIZE)
 216                 amt = CH_CODE_SIZE;
 217
 218         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
 219         SECT * p = &sect[cursect];
 220         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
 221         int first = 0;
 222
 223         if (scode == NULL)
 224         {
 225                 // First chunk in section
 226                 cp->chprev = NULL;
 227                 p->sfcode = cp;
 228                 first = 1;
 229         }
 230         else
 231         {
 232                 // Add second and on to previous chunk
 233                 cp->chprev = scode;
 234                 scode->chnext = cp;
 235                 scode->ch_size = ch_size;       // Save old chunk's globals
 236         }
 237
 238         // Setup chunk and global vars
 239 /*
 240 So, whenever there's an ORG in a 56K section, it sets sloc TO THE ADDRESS IN THE ORG.  Also, the loc/sloc are incremented by 1s, which means to alias correctly to the byte-oriented memory model we have here, we have to fix that kind of crap.
 241 */
 242         cp->chloc = sloc; // <-- HERE'S THE PROBLEM FOR 56K  :-/
 243         cp->chnext = NULL;
 244         challoc = cp->challoc = amt;
 245         ch_size = cp->ch_size = 0;
 246         chptr = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
 247         scode = p->scode = cp;
 248
 249         // A quick kludge
 250 /*
 251 OK, so this is a bit shite, but at least it gets things working the way they should.  The right way to do this is not rely on sloc & friends for the right fixup address but to have an accurate model of the thing.  That will probably come with v2.0.1  :-P
 252
 253 So the problem is, d_org sets sloc to the address of the ORG statement, and that gives an incorrect base for the fixup.  And so when a second (or later) chunk is allocated, it gets set wrong.  Further complicating things is that the orgaddress *does not* get used in a typical way with the DSP56001 code, and, as such, causes incorrect addresses to be generated.  All that has to be dealt with in order to get this right and do away with this kludge.
 254 */
 255         if (((cursect == M56001P) || (cursect == M56001X) || (cursect == M56001Y)) && !first)
 256                 cp->chloc = cp->chprev->chloc + cp->chprev->ch_size;
 257
 258         return;
 259 }
 260
 261
 262 //
 263 // Arrange for a fixup on a location
 264 //
 265 int AddFixup(uint32_t attr, uint32_t loc, TOKEN * fexpr)
 266 {
 267         uint16_t exprlen = 0;
 268         SYM * symbol = NULL;
 269         uint32_t _orgaddr = 0;
 270
 271         // First, check to see if the expression is a bare label, otherwise, force
 272         // the FU_EXPR flag into the attributes and count the tokens.
 273         if ((fexpr[0] == SYMBOL) && (fexpr[2] == ENDEXPR))
 274         {
 275                 symbol = symbolPtr[fexpr[1]];
 276
 277                 // Save the org address for JR RISC instruction
 278                 if ((attr & FUMASKRISC) == FU_JR)
 279                         _orgaddr = orgaddr;
 280         }
 281         else
 282         {
 283                 attr |= FU_EXPR;
 284                 exprlen = ExpressionLength(fexpr);
 285         }
 286
 287         // Second, check to see if it's a DSP56001 fixup, and force the FU_56001
 288         // flag into the attributes if so; also save the current org address.
 289         if (attr & FUMASKDSP)
 290         {
 291                 attr |= FU_56001;
 292                 // Save the exact spot in this chunk where the fixup should go
 293                 _orgaddr = chptr - scode->chptr + scode->chloc;
 294         }
 295
 296         // Allocate space for the fixup + any expression
 297         FIXUP * fixup = malloc(sizeof(FIXUP) + (sizeof(TOKEN) * exprlen));
 298
 299         // Store the relevant fixup information in the FIXUP
 300         fixup->next = NULL;
 301         fixup->attr = attr;
 302         fixup->loc = loc;
 303         fixup->fileno = cfileno;
 304         fixup->lineno = curlineno;
 305         fixup->expr = NULL;
 306         fixup->symbol = symbol;
 307         fixup->orgaddr = _orgaddr;
 308
 309         // Copy the passed in expression to the FIXUP, if any
 310         if (exprlen > 0)
 311         {
 312                 fixup->expr = (TOKEN *)((uint8_t *)fixup + sizeof(FIXUP));
 313                 memcpy(fixup->expr, fexpr, sizeof(TOKEN) * exprlen);
 314         }
 315
 316         // Finally, put the FIXUP in the current section's linked list
 317         if (sect[cursect].sffix == NULL)
 318         {
 319                 sect[cursect].sffix = fixup;
 320                 sect[cursect].sfix = fixup;
 321         }
 322         else
 323         {
 324                 sect[cursect].sfix->next = fixup;
 325                 sect[cursect].sfix = fixup;
 326         }
 327
 328         DEBUG { printf("AddFixup: sno=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", cursect, fixup->lineno, fixup->attr, fixup->loc, (void *)fixup->expr, (void *)fixup->symbol, fixup->orgaddr);
 329                 if (symbol != NULL)
 330                         printf("          name: %s, value: $%lX\n", symbol->sname, symbol->svalue);
 331         }
 332
 333         return 0;
 334 }
 335
 336
 337 //
 338 // Resolve fixups in the passed in section
 339 //
 340 int ResolveFixups(int sno)
 341 {
 342         SECT * sc = &sect[sno];
 343
 344         // "Cache" first chunk
 345         CHUNK * cch = sc->sfcode;
 346
 347         // Can't fixup a section with nothing in it
 348         if (cch == NULL)
 349                 return 0;
 350
 351         // Wire the 6502 segment's size to its allocated size (64K)
 352         if (sno == M6502)
 353                 cch->ch_size = cch->challoc;
 354
 355         // Get first fixup for the passed in section
 356         FIXUP * fixup = sect[sno].sffix;
 357
 358         while (fixup != NULL)
 359         {
 360                 // We do it this way because we have continues everywhere... :-P
 361                 FIXUP * fup = fixup;
 362                 fixup = fixup->next;
 363
 364                 uint32_t dw = fup->attr;        // Fixup long (type + modes + flags)
 365                 uint32_t loc = fup->loc;        // Location to fixup
 366                 cfileno = fup->fileno;
 367                 curlineno = fup->lineno;
 368                 DEBUG { printf("ResolveFixups: sect#=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", sno, fup->lineno, fup->attr, fup->loc, (void *)fup->expr, (void *)fup->symbol, fup->orgaddr); }
 369
 370                 // This is based on global vars cfileno, curfname :-P
 371                 // This approach is kinda meh as well. I think we can do better
 372                 // than this.
 373                 SetFilenameForErrorReporting();
 374
 375                 if ((sno == M56001P) || (sno == M56001X) || (sno == M56001Y) || (sno == M56001L))
 376                         loc = fup->orgaddr;
 377
 378                 // Search for chunk containing location to fix up; compute a
 379                 // pointer to the location (in the chunk). Often we will find the
 380                 // Fixup is in the "cached" chunk, so the linear-search is seldom
 381                 // executed.
 382                 if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
 383                 {
 384                         for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
 385                         {
 386                                 if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
 387                                         break;
 388                         }
 389
 390                         if (cch == NULL)
 391                         {
 392                                 // Fixup (loc) is out of range--this should never happen!
 393                                 // Once we call this function, it winds down immediately; it
 394                                 // doesn't return.
 395                                 interror(7);
 396                         }
 397                 }
 398
 399                 // Location to fix (in current chunk)
 400                 // We use the address of the chunk that loc is actually in, then
 401                 // subtract the chunk's starting location from loc to get the offset
 402                 // into the current chunk.
 403                 uint8_t * locp = cch->chptr + (loc - cch->chloc);
 404
 405                 uint16_t eattr = 0;                     // Expression attrib
 406                 SYM * esym = NULL;                      // External symbol involved in expr
 407                 uint64_t eval;                          // Expression value
 408                 uint16_t flags;                         // Mark flags
 409
 410                 // Compute expression/symbol value and attributes
 411
 412                 // Complex expression
 413                 if (dw & FU_EXPR)
 414                 {
 415                         // evexpr presumably issues the errors/warnings here
 416                         if (evexpr(fup->expr, &eval, &eattr, &esym) != OK)
 417                                 continue;
 418                 }
 419                 // Simple symbol
 420                 else
 421                 {
 422                         SYM * sy = fup->symbol;
 423                         eattr = sy->sattr;
 424
 425                         if (eattr & DEFINED)
 426                                 eval = sy->svalue;
 427                         else
 428                                 eval = 0;
 429
 430                         // If the symbol is not defined, but global, set esym to sy
 431                         if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 432                                 esym = sy;
 433
 434                         DEBUG { printf("               name: %s, value: $%" PRIX64 "\n", sy->sname, sy->svalue); }
 435                 }
 436
 437                 uint16_t tdb = eattr & TDB;
 438
 439                 // If the expression/symbol is undefined and no external symbol is
 440                 // involved, then that's an error.
 441                 if (!(eattr & DEFINED) && (esym == NULL))
 442                 {
 443                         error(undef_error);
 444                         continue;
 445                 }
 446
 447                 // Do the fixup
 448                 //
 449                 // If a PC-relative fixup is undefined, its value is *not* subtracted
 450                 // from the location (that will happen in the linker when the external
 451                 // reference is resolved).
 452                 //
 453                 // MWC expects PC-relative things to have the LOC subtracted from the
 454                 // value, if the value is external (that is, undefined at this point).
 455                 //
 456                 // PC-relative fixups must be DEFINED and either in the same section
 457                 // (whereupon the subtraction takes place) or ABS (with no subtract).
 458                 if ((dw & FU_PCREL) || (dw & FU_PCRELX))
 459                 {
 460                         if (eattr & DEFINED)
 461                         {
 462                                 if (tdb == sno)
 463                                 {
 464                                         eval -= loc;
 465
 466                                         // In this instruction the PC is located a DWORD away
 467                                         if (dw & FU_PCRELX)
 468                                                 eval += 2;
 469                                 }
 470                                 else if (tdb)
 471                                 {
 472                                         // Allow cross-section PCREL fixups in Alcyon mode
 473                                         if (prg_flag)
 474                                         {
 475                                                 switch (tdb)
 476                                                 {
 477                                                 case TEXT:
 478 // Shouldn't there be a break here, since otherwise, it will point to the DATA section?
 479 //                                                      break;
 480                                                 case DATA:
 481                                                         eval += sect[TEXT].sloc;
 482                                                         break;
 483                                                 case BSS:
 484                                                         eval += sect[TEXT].sloc + sect[DATA].sloc;
 485                                                         break;
 486                                                 default:
 487                                                         error("invalid section");
 488                                                 break;
 489                                                 }
 490
 491                                                 eval -= loc;
 492
 493                                                 // In this instruction the PC is located a DWORD away
 494                                                 if (dw & FU_PCRELX)
 495                                                         eval += 2;
 496                                         }
 497                                         else
 498                                         {
 499                                                 error("PC-relative expr across sections");
 500                                                 continue;
 501                                         }
 502                                 }
 503
 504                                 if (sbra_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
 505                                         warn("unoptimized short branch");
 506                         }
 507                         else if (obj_format == MWC)
 508                         {
 509                                 eval -= loc;
 510
 511                                 // In this instruction the PC is located a DWORD away
 512                                 if (dw & FU_PCRELX)
 513                                         eval += 2;
 514                         }
 515
 516                         // Be sure to clear any TDB flags, since we handled it just now
 517                         tdb = 0;
 518                         eattr &= ~TDB;
 519                 }
 520
 521                 // Handle fixup classes
 522                 switch (dw & FUMASK)
 523                 {
 524                 // FU_BBRA fixes up a one-byte branch offset.
 525                 case FU_BBRA:
 526                         if (!(eattr & DEFINED))
 527                         {
 528                                 error("external short branch");
 529                                 continue;
 530                         }
 531
 532                         eval -= 2;
 533
 534                         if (eval + 0x80 >= 0x100)
 535                                 goto rangeErr;
 536
 537                         if (eval == 0)
 538                         {
 539                                 if (CHECK_OPTS(OPT_NULL_BRA))
 540                                 {
 541                                         // Just output a NOP
 542                                         *locp++ = 0x4E;
 543                                         *locp = 0x71;
 544                                         continue;
 545                                 }
 546                                 else
 547                                 {
 548                                         error("illegal bra.s with zero offset");
 549                                         continue;
 550                                 }
 551                         }
 552
 553                         *++locp = (uint8_t)eval;
 554                         break;
 555
 556                 // Fixup one-byte value at locp + 1.
 557                 case FU_WBYTE:
 558                         locp++;
 559                         // FALLTHROUGH
 560
 561                 // Fixup one-byte forward references
 562                 case FU_BYTE:
 563                         if (!(eattr & DEFINED))
 564                         {
 565                                 error("external byte reference");
 566                                 continue;
 567                         }
 568
 569                         if (tdb)
 570                         {
 571                                 error("non-absolute byte reference");
 572                                 continue;
 573                         }
 574
 575                         if ((dw & FU_PCREL) && ((eval + 0x80) >= 0x100))
 576                                 goto rangeErr;
 577
 578                         if (dw & FU_SEXT)
 579                         {
 580                                 if ((eval + 0x100) >= 0x200)
 581                                         goto rangeErr;
 582                         }
 583                         else if (eval >= 0x100)
 584                                 goto rangeErr;
 585
 586                         *locp = (uint8_t)eval;
 587                         break;
 588
 589                 // Fixup high/low byte off word for 6502
 590                 case FU_BYTEH:
 591                         if (!(eattr & DEFINED))
 592                         {
 593                                 error("external byte reference");
 594                                 continue;
 595                         }
 596
 597                         *locp = (uint8_t)(eval >> 8);
 598                         break;
 599
 600                 case FU_BYTEL:
 601                         if (!(eattr & DEFINED))
 602                         {
 603                                 error("external byte reference");
 604                                 continue;
 605                         }
 606
 607                         *locp = (uint8_t)eval;
 608                         break;
 609
 610                 // Fixup WORD forward references; the word could be unaligned in the
 611                 // section buffer, so we have to be careful. (? careful about what?)
 612                 case FU_WORD:
 613                         if ((dw & FUMASKRISC) == FU_JR)
 614                         {
 615                                 int reg = (signed)((eval - ((fup->orgaddr ? fup->orgaddr : loc) + 2)) / 2);
 616
 617                                 if ((reg < -16) || (reg > 15))
 618                                 {
 619                                         error("relative jump out of range");
 620                                         break;
 621                                 }
 622
 623                                 *locp |= ((uint8_t)reg >> 3) & 0x03;
 624                                 locp++;
 625                                 *locp |= ((uint8_t)reg & 0x07) << 5;
 626                                 break;
 627                         }
 628                         else if ((dw & FUMASKRISC) == FU_NUM15)
 629                         {
 630                                 if (((int)eval < -16) || ((int)eval > 15))
 631                                 {
 632                                         error("constant out of range (-16 - +15)");
 633                                         break;
 634                                 }
 635
 636                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 637                                 locp++;
 638                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 639                                 break;
 640                         }
 641                         else if ((dw & FUMASKRISC) == FU_NUM31)
 642                         {
 643                                 if (eval > 31)
 644                                 {
 645                                         error("constant out of range (0-31)");
 646                                         break;
 647                                 }
 648
 649                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 650                                 locp++;
 651                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 652                                 break;
 653                         }
 654                         else if ((dw & FUMASKRISC) == FU_NUM32)
 655                         {
 656                                 if ((eval < 1) || (eval > 32))
 657                                 {
 658                                         error("constant out of range (1-32)");
 659                                         break;
 660                                 }
 661
 662                                 if (dw & FU_SUB32)
 663                                         eval = (32 - eval);
 664
 665                                 eval = (eval == 32) ? 0 : eval;
 666                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 667                                 locp++;
 668                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 669                                 break;
 670                         }
 671                         else if ((dw & FUMASKRISC) == FU_REGONE)
 672                         {
 673                                 if (eval > 31)
 674                                 {
 675                                         error("register one value out of range");
 676                                         break;
 677                                 }
 678
 679                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 680                                 locp++;
 681                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 682                                 break;
 683                         }
 684                         else if ((dw & FUMASKRISC) == FU_REGTWO)
 685                         {
 686                                 if (eval > 31)
 687                                 {
 688                                         error("register two value out of range");
 689                                         break;
 690                                 }
 691
 692                                 locp++;
 693                                 *locp |= (uint8_t)eval & 0x1F;
 694                                 break;
 695                         }
 696
 697                         if (!(eattr & DEFINED))
 698                         {
 699                                 flags = MWORD;
 700
 701                                 if (dw & FU_PCREL)
 702                                         flags |= MPCREL;
 703
 704                                 MarkRelocatable(sno, loc, 0, flags, esym);
 705                         }
 706                         else
 707                         {
 708                                 if (tdb)
 709                                         MarkRelocatable(sno, loc, tdb, MWORD, NULL);
 710
 711                                 if (dw & FU_SEXT)
 712                                 {
 713                                         if (eval + 0x10000 >= 0x20000)
 714                                                 goto rangeErr;
 715                                 }
 716                                 else
 717                                 {
 718                                         // Range-check BRA and DBRA
 719                                         if (dw & FU_ISBRA)
 720                                         {
 721                                                 if (eval + 0x8000 >= 0x10000)
 722                                                         goto rangeErr;
 723                                         }
 724                                         else if (eval >= 0x10000)
 725                                                 goto rangeErr;
 726                                 }
 727                         }
 728
 729                         // 6502 words are little endian, so handle that here
 730                         if (sno == M6502)
 731                                 SETLE16(locp, 0, eval)
 732                         else
 733                                 SETBE16(locp, 0, eval)
 734
 735                         break;
 736
 737                 // Fixup LONG forward references; the long could be unaligned in the
 738                 // section buffer, so be careful (again).
 739                 case FU_LONG:
 740                         flags = MLONG;
 741
 742                         if ((dw & FUMASKRISC) == FU_MOVEI)
 743                         {
 744                                 // Long constant in MOVEI # is word-swapped, so fix it here
 745                                 eval = WORDSWAP32(eval);
 746                                 flags |= MMOVEI;
 747                         }
 748
 749                         // If the symbol is undefined, make sure to pass the symbol in
 750                         // to the MarkRelocatable() function.
 751                         if (!(eattr & DEFINED))
 752                                 MarkRelocatable(sno, loc, 0, flags, esym);
 753                         else if (tdb)
 754                                 MarkRelocatable(sno, loc, tdb, flags, NULL);
 755
 756                         SETBE32(locp, 0, eval);
 757                         break;
 758
 759                 // Fixup QUAD forward references (mainly used by the OP assembler)
 760                 case FU_QUAD:
 761                         if (dw & FU_OBJLINK)
 762                         {
 763                                 uint64_t quad = GETBE64(locp, 0);
 764                                 uint64_t addr = eval;
 765
 766 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 767 //                              if (fup->orgaddr)
 768 //                                      addr = fup->orgaddr;
 769
 770                                 eval = (quad & 0xFFFFFC0000FFFFFFLL) | ((addr & 0x3FFFF8) << 21);
 771                         }
 772                         else if (dw & FU_OBJDATA)
 773                         {
 774                                 // If it's in a TEXT or DATA section, be sure to mark for a
 775                                 // fixup later
 776                                 if (tdb)
 777                                         MarkRelocatable(sno, loc, tdb, MQUAD, NULL);
 778
 779                                 uint64_t quad = GETBE64(locp, 0);
 780                                 uint64_t addr = eval;
 781
 782 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 783 //                              if (fup->orgaddr)
 784 //                                      addr = fup->orgaddr;
 785
 786                                 eval = (quad & 0x000007FFFFFFFFFFLL) | ((addr & 0xFFFFF8) << 40);
 787                         }
 788
 789                         SETBE64(locp, 0, eval);
 790                         break;
 791
 792                 // Fixup a 3-bit "QUICK" reference in bits 9..1
 793                 // (range of 1..8) in a word. [Really bits 1..3 in a byte.]
 794                 case FU_QUICK:
 795                         if (!(eattr & DEFINED))
 796                         {
 797                                 error("External quick reference");
 798                                 continue;
 799                         }
 800
 801                         if ((eval < 1) || (eval > 8))
 802                                 goto rangeErr;
 803
 804                         *locp |= (eval & 7) << 1;
 805                         break;
 806
 807                 // Fix up 6502 funny branch
 808                 case FU_6BRA:
 809                         eval -= (loc + 1);
 810
 811                         if (eval + 0x80 >= 0x100)
 812                                 goto rangeErr;
 813
 814                         *locp = (uint8_t)eval;
 815                         break;
 816
 817                 // Fixup DSP56001 addresses
 818                 case FU_56001:
 819                         switch (dw & FUMASKDSP)
 820                         {
 821                         // DSPIMM5 actually is clamped from 0 to 23 for our purposes
 822                         // and does not use the full 5 bit range.
 823                         case FU_DSPIMM5:
 824                                 if (eval > 23)
 825                                 {
 826                                         error("immediate value must be between 0 and 23");
 827                                         break;
 828                                 }
 829
 830                                 locp[2] |= eval;
 831                                 break;
 832
 833                         // This is a 12-bit address encoded into the lower 12
 834                         // bits of a DSP word
 835                         case FU_DSPADR12:
 836                                 if (eval >= 0x1000)
 837                                 {
 838                                         error("address out of range ($0-$FFF)");
 839                                         break;
 840                                 }
 841
 842                                 locp[1] |= eval >> 8;
 843                                 locp[2] = eval & 0xFF;
 844                                 break;
 845
 846                         // This is a full DSP word containing Effective Address Extension
 847                         case FU_DSPADR24:
 848                         case FU_DSPIMM24:
 849                                 if (eval >= 0x1000000)
 850                                 {
 851                                         error("value out of range ($0-$FFFFFF)");
 852                                         break;
 853                                 }
 854
 855                                 locp[0] = (uint8_t)((eval >> 16) & 0xFF);
 856                                 locp[1] = (uint8_t)((eval >> 8) & 0xFF);
 857                                 locp[2] = (uint8_t)(eval & 0xFF);
 858                                 break;
 859
 860                         // This is a 16bit absolute address into a 24bit field
 861                         case FU_DSPADR16:
 862                                 if (eval >= 0x10000)
 863                                 {
 864                                         error("address out of range ($0-$FFFF)");
 865                                         break;
 866                                 }
 867
 868                                 locp[1] = (uint8_t)(eval >> 8);
 869                                 locp[2] = (uint8_t)eval;
 870                                 break;
 871
 872                         // This is 12-bit immediate short data
 873                         // The upper nibble goes into the last byte's low nibble
 874                         // while the remainder 8 bits go into the 2nd byte.
 875                         case FU_DSPIMM12:
 876                                 if (eval >= 0x1000)
 877                                 {
 878                                         error("immediate out of range ($0-$FFF)");
 879                                         break;
 880                                 }
 881
 882                                 locp[1] = (uint8_t)eval;
 883                                 locp[2] |= (uint8_t)(eval >> 8);
 884                                 break;
 885
 886                         // This is 8-bit immediate short data
 887                         // which goes into the middle byte of a DSP word.
 888                         case FU_DSPIMM8:
 889                                 if (eval >= 0x100)
 890                                 {
 891                                         error("immediate out of range ($0-$FF)");
 892                                         break;
 893                                 }
 894
 895                                 locp[1] = (uint8_t)eval;
 896                                 break;
 897
 898                         // This is a 6 bit absoulte short address. It occupies
 899                         // the low 6 bits of the middle byte of a DSP word.
 900                         case FU_DSPADR06:
 901                                 if (eval > 63)
 902                                 {
 903                                         error("address must be between 0 and 63");
 904                                         break;
 905                                 }
 906
 907                                 locp[1] |= eval;
 908                                 break;
 909
 910                         // This is a 6 bit absoulte short address. It occupies
 911                         // the low 6 bits of the middle byte of a DSP word.
 912                         case FU_DSPPP06:
 913                                 if (eval < 0xFFFFFFC0)
 914                                 {
 915                                         error("address must be between $FFC0 and $FFFF");
 916                                         break;
 917                                 }
 918
 919                                 locp[1] |= eval & 0x3F;
 920                                 break;
 921
 922                         // Shamus: I'm pretty sure these don't make any sense...
 923                         case FU_DSPIMMFL8:
 924                                 warn("FU_DSPIMMFL8 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 925                                 break;
 926
 927                         case FU_DSPIMMFL16:
 928                                 warn("FU_DSPIMMFL16 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 929                                 break;
 930
 931                         case FU_DSPIMMFL24:
 932                                 warn("FU_DSPIMMFL24 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 933                                 break;
 934
 935                         // Bad fixup type--this should *never* happen!
 936                         default:
 937                                 interror(4);
 938                                 // NOTREACHED
 939                         }
 940                         break;
 941
 942                 // Fixup a 4-byte float
 943                 case FU_FLOATSING:
 944                         warn("FU_FLOATSING missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 945                         break;
 946
 947                 // Fixup a 8-byte float
 948                 case FU_FLOATDOUB:
 949                         warn("FU_FLOATDOUB missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 950                         break;
 951
 952                 // Fixup a 12-byte float
 953                 case FU_FLOATEXT:
 954                         warn("FU_FLOATEXT missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 955                         break;
 956
 957                 default:
 958                         // Bad fixup type--this should *never* happen!
 959                         // Once we call this function, it winds down immediately; it
 960                         // doesn't return.
 961                         interror(4);
 962                 }
 963
 964                 continue;
 965 rangeErr:
 966                 error("expression out of range");
 967         }
 968
 969         return 0;
 970 }
 971
 972
 973 //
 974 // Resolve all fixups
 975 //
 976 int ResolveAllFixups(void)
 977 {
 978         // Make undefined symbols GLOBL
 979         if (glob_flag)
 980                 ForceUndefinedSymbolsGlobal();
 981
 982         DEBUG printf("Resolving TEXT sections...\n");
 983         ResolveFixups(TEXT);
 984         DEBUG printf("Resolving DATA sections...\n");
 985         ResolveFixups(DATA);
 986         DEBUG printf("Resolving 6502 sections...\n");
 987         ResolveFixups(M6502);           // Fixup 6502 section (if any)
 988         DEBUG printf("Resolving DSP56001 P: sections...\n");
 989         ResolveFixups(M56001P);         // Fixup 56001 P: section (if any)
 990         DEBUG printf("Resolving DSP56001 X: sections...\n");
 991         ResolveFixups(M56001X);         // Fixup 56001 X: section (if any)
 992         DEBUG printf("Resolving DSP56001 Y: sections...\n");
 993         ResolveFixups(M56001Y);         // Fixup 56001 Y: section (if any)
 994
 995         return 0;
 996 }
 997