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, 2011-2020 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                 // PC-relative fixups must be DEFINED and either in the same section
 454                 // (whereupon the subtraction takes place) or ABS (with no subtract).
 455                 if ((dw & FU_PCREL) || (dw & FU_PCRELX))
 456                 {
 457                         if (eattr & DEFINED)
 458                         {
 459                                 if (tdb == sno)
 460                                 {
 461                                         eval -= loc;
 462
 463                                         // In this instruction the PC is located a DWORD away
 464                                         if (dw & FU_PCRELX)
 465                                                 eval += 2;
 466                                 }
 467                                 else if (tdb)
 468                                 {
 469                                         // Allow cross-section PCREL fixups in Alcyon mode
 470                                         if (prg_flag || (obj_format == RAW))
 471                                         {
 472                                                 switch (tdb)
 473                                                 {
 474                                                 case TEXT:
 475 // Shouldn't there be a break here, since otherwise, it will point to the DATA section?
 476 //                                                      break;
 477                                                 case DATA:
 478                                                         eval += sect[TEXT].sloc;
 479                                                         break;
 480                                                 case BSS:
 481                                                         eval += sect[TEXT].sloc + sect[DATA].sloc;
 482                                                         break;
 483                                                 default:
 484                                                         error("invalid section");
 485                                                 break;
 486                                                 }
 487
 488                                                 eval -= loc;
 489
 490                                                 // In this instruction the PC is located a DWORD away
 491                                                 if (dw & FU_PCRELX)
 492                                                         eval += 2;
 493                                         }
 494                                         else
 495                                         {
 496                                                 error("PC-relative expr across sections");
 497                                                 continue;
 498                                         }
 499                                 }
 500
 501                                 if (sbra_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
 502                                         warn("unoptimized short branch");
 503                         }
 504
 505                         // Be sure to clear any TDB flags, since we handled it just now
 506                         tdb = 0;
 507                         eattr &= ~TDB;
 508                 }
 509
 510                 // Handle fixup classes
 511                 switch (dw & FUMASK)
 512                 {
 513                 // FU_BBRA fixes up a one-byte branch offset.
 514                 case FU_BBRA:
 515                         if (!(eattr & DEFINED))
 516                         {
 517                                 error("external short branch");
 518                                 continue;
 519                         }
 520
 521                         eval -= 2;
 522
 523                         if (eval + 0x80 >= 0x100)
 524                                 goto rangeErr;
 525
 526                         if (eval == 0)
 527                         {
 528                                 if (CHECK_OPTS(OPT_NULL_BRA))
 529                                 {
 530                                         // Just output a NOP
 531                                         *locp++ = 0x4E;
 532                                         *locp = 0x71;
 533                                         continue;
 534                                 }
 535                                 else
 536                                 {
 537                                         error("illegal bra.s with zero offset");
 538                                         continue;
 539                                 }
 540                         }
 541
 542                         *++locp = (uint8_t)eval;
 543                         break;
 544
 545                 // Fixup one-byte value at locp + 1.
 546                 case FU_WBYTE:
 547                         locp++;
 548                         // FALLTHROUGH
 549
 550                 // Fixup one-byte forward references
 551                 case FU_BYTE:
 552                         if (!(eattr & DEFINED))
 553                         {
 554                                 error("external byte reference");
 555                                 continue;
 556                         }
 557
 558                         if (tdb)
 559                         {
 560                                 error("non-absolute byte reference");
 561                                 continue;
 562                         }
 563
 564                         if ((dw & FU_PCREL) && ((eval + 0x80) >= 0x100))
 565                                 goto rangeErr;
 566
 567                         if (dw & FU_SEXT)
 568                         {
 569                                 if ((eval + 0x100) >= 0x200)
 570                                         goto rangeErr;
 571                         }
 572                         else if (eval >= 0x100)
 573                                 goto rangeErr;
 574
 575                         *locp = (uint8_t)eval;
 576                         break;
 577
 578                 // Fixup high/low byte off word for 6502
 579                 case FU_BYTEH:
 580                         if (!(eattr & DEFINED))
 581                         {
 582                                 error("external byte reference");
 583                                 continue;
 584                         }
 585
 586                         *locp = (uint8_t)(eval >> 8);
 587                         break;
 588
 589                 case FU_BYTEL:
 590                         if (!(eattr & DEFINED))
 591                         {
 592                                 error("external byte reference");
 593                                 continue;
 594                         }
 595
 596                         *locp = (uint8_t)eval;
 597                         break;
 598
 599                 // Fixup WORD forward references; the word could be unaligned in the
 600                 // section buffer, so we have to be careful. (? careful about what?)
 601                 case FU_WORD:
 602                         if ((dw & FUMASKRISC) == FU_JR)
 603                         {
 604                                 int reg = (signed)((eval - ((fup->orgaddr ? fup->orgaddr : loc) + 2)) / 2);
 605
 606                                 if ((reg < -16) || (reg > 15))
 607                                 {
 608                                         error("relative jump out of range");
 609                                         break;
 610                                 }
 611
 612                                 *locp |= ((uint8_t)reg >> 3) & 0x03;
 613                                 locp++;
 614                                 *locp |= ((uint8_t)reg & 0x07) << 5;
 615                                 break;
 616                         }
 617                         else if ((dw & FUMASKRISC) == FU_NUM15)
 618                         {
 619                                 if (((int)eval < -16) || ((int)eval > 15))
 620                                 {
 621                                         error("constant out of range (-16 - +15)");
 622                                         break;
 623                                 }
 624
 625                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 626                                 locp++;
 627                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 628                                 break;
 629                         }
 630                         else if ((dw & FUMASKRISC) == FU_NUM31)
 631                         {
 632                                 if (eval > 31)
 633                                 {
 634                                         error("constant out of range (0-31)");
 635                                         break;
 636                                 }
 637
 638                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 639                                 locp++;
 640                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 641                                 break;
 642                         }
 643                         else if ((dw & FUMASKRISC) == FU_NUM32)
 644                         {
 645                                 if ((eval < 1) || (eval > 32))
 646                                 {
 647                                         error("constant out of range (1-32)");
 648                                         break;
 649                                 }
 650
 651                                 if (dw & FU_SUB32)
 652                                         eval = (32 - eval);
 653
 654                                 eval = (eval == 32) ? 0 : eval;
 655                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 656                                 locp++;
 657                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 658                                 break;
 659                         }
 660                         else if ((dw & FUMASKRISC) == FU_REGONE)
 661                         {
 662                                 if (eval > 31)
 663                                 {
 664                                         error("register one value out of range");
 665                                         break;
 666                                 }
 667
 668                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 669                                 locp++;
 670                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 671                                 break;
 672                         }
 673                         else if ((dw & FUMASKRISC) == FU_REGTWO)
 674                         {
 675                                 if (eval > 31)
 676                                 {
 677                                         error("register two value out of range");
 678                                         break;
 679                                 }
 680
 681                                 locp++;
 682                                 *locp |= (uint8_t)eval & 0x1F;
 683                                 break;
 684                         }
 685
 686                         if (!(eattr & DEFINED))
 687                         {
 688                                 flags = MWORD;
 689
 690                                 if (dw & FU_PCREL)
 691                                         flags |= MPCREL;
 692
 693                                 MarkRelocatable(sno, loc, 0, flags, esym);
 694                         }
 695                         else
 696                         {
 697                                 if (tdb)
 698                                         MarkRelocatable(sno, loc, tdb, MWORD, NULL);
 699
 700                                 if (dw & FU_SEXT)
 701                                 {
 702                                         if (eval + 0x10000 >= 0x20000)
 703                                                 goto rangeErr;
 704                                 }
 705                                 else
 706                                 {
 707                                         // Range-check BRA and DBRA
 708                                         if (dw & FU_ISBRA)
 709                                         {
 710                                                 if (eval + 0x8000 >= 0x10000)
 711                                                         goto rangeErr;
 712                                         }
 713                                         else if (eval >= 0x10000)
 714                                                 goto rangeErr;
 715                                 }
 716                         }
 717
 718                         // 6502 words are little endian, so handle that here
 719                         if (sno == M6502)
 720                                 SETLE16(locp, 0, eval)
 721                         else
 722                                 SETBE16(locp, 0, eval)
 723
 724                         break;
 725
 726                 // Fixup LONG forward references; the long could be unaligned in the
 727                 // section buffer, so be careful (again).
 728                 case FU_LONG:
 729                         flags = MLONG;
 730
 731                         if ((dw & FUMASKRISC) == FU_MOVEI)
 732                         {
 733                                 // Long constant in MOVEI # is word-swapped, so fix it here
 734                                 eval = WORDSWAP32(eval);
 735                                 flags |= MMOVEI;
 736                         }
 737
 738                         // If the symbol is undefined, make sure to pass the symbol in
 739                         // to the MarkRelocatable() function.
 740                         if (!(eattr & DEFINED))
 741                                 MarkRelocatable(sno, loc, 0, flags, esym);
 742                         else if (tdb)
 743                                 MarkRelocatable(sno, loc, tdb, flags, NULL);
 744
 745                         SETBE32(locp, 0, eval);
 746                         break;
 747
 748                 // Fixup QUAD forward references (mainly used by the OP assembler)
 749                 case FU_QUAD:
 750                         if (dw & FU_OBJLINK)
 751                         {
 752                                 uint64_t quad = GETBE64(locp, 0);
 753                                 uint64_t addr = eval;
 754
 755 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 756 //                              if (fup->orgaddr)
 757 //                                      addr = fup->orgaddr;
 758
 759                                 eval = (quad & 0xFFFFFC0000FFFFFFLL) | ((addr & 0x3FFFF8) << 21);
 760                         }
 761                         else if (dw & FU_OBJDATA)
 762                         {
 763                                 // If it's in a TEXT or DATA section, be sure to mark for a
 764                                 // fixup later
 765                                 if (tdb)
 766                                         MarkRelocatable(sno, loc, tdb, MQUAD, NULL);
 767
 768                                 uint64_t quad = GETBE64(locp, 0);
 769                                 uint64_t addr = eval;
 770
 771 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 772 //                              if (fup->orgaddr)
 773 //                                      addr = fup->orgaddr;
 774
 775                                 eval = (quad & 0x000007FFFFFFFFFFLL) | ((addr & 0xFFFFF8) << 40);
 776                         }
 777
 778                         SETBE64(locp, 0, eval);
 779                         break;
 780
 781                 // Fixup a 3-bit "QUICK" reference in bits 9..1
 782                 // (range of 1..8) in a word. [Really bits 1..3 in a byte.]
 783                 case FU_QUICK:
 784                         if (!(eattr & DEFINED))
 785                         {
 786                                 error("External quick reference");
 787                                 continue;
 788                         }
 789
 790                         if ((eval < 1) || (eval > 8))
 791                                 goto rangeErr;
 792
 793                         *locp |= (eval & 7) << 1;
 794                         break;
 795
 796                 // Fix up 6502 funny branch
 797                 case FU_6BRA:
 798                         eval -= (loc + 1);
 799
 800                         if (eval + 0x80 >= 0x100)
 801                                 goto rangeErr;
 802
 803                         *locp = (uint8_t)eval;
 804                         break;
 805
 806                 // Fixup DSP56001 addresses
 807                 case FU_56001:
 808                         switch (dw & FUMASKDSP)
 809                         {
 810                         // DSPIMM5 actually is clamped from 0 to 23 for our purposes
 811                         // and does not use the full 5 bit range.
 812                         case FU_DSPIMM5:
 813                                 if (eval > 23)
 814                                 {
 815                                         error("immediate value must be between 0 and 23");
 816                                         break;
 817                                 }
 818
 819                                 locp[2] |= eval;
 820                                 break;
 821
 822                         // This is a 12-bit address encoded into the lower 12
 823                         // bits of a DSP word
 824                         case FU_DSPADR12:
 825                                 if (eval >= 0x1000)
 826                                 {
 827                                         error("address out of range ($0-$FFF)");
 828                                         break;
 829                                 }
 830
 831                                 locp[1] |= eval >> 8;
 832                                 locp[2] = eval & 0xFF;
 833                                 break;
 834
 835                         // This is a full DSP word containing Effective Address Extension
 836                         case FU_DSPADR24:
 837                         case FU_DSPIMM24:
 838                                 if (eval >= 0x1000000)
 839                                 {
 840                                         error("value out of range ($0-$FFFFFF)");
 841                                         break;
 842                                 }
 843
 844                                 locp[0] = (uint8_t)((eval >> 16) & 0xFF);
 845                                 locp[1] = (uint8_t)((eval >> 8) & 0xFF);
 846                                 locp[2] = (uint8_t)(eval & 0xFF);
 847                                 break;
 848
 849                         // This is a 16bit absolute address into a 24bit field
 850                         case FU_DSPADR16:
 851                                 if (eval >= 0x10000)
 852                                 {
 853                                         error("address out of range ($0-$FFFF)");
 854                                         break;
 855                                 }
 856
 857                                 locp[1] = (uint8_t)(eval >> 8);
 858                                 locp[2] = (uint8_t)eval;
 859                                 break;
 860
 861                         // This is 12-bit immediate short data
 862                         // The upper nibble goes into the last byte's low nibble
 863                         // while the remainder 8 bits go into the 2nd byte.
 864                         case FU_DSPIMM12:
 865                                 if (eval >= 0x1000)
 866                                 {
 867                                         error("immediate out of range ($0-$FFF)");
 868                                         break;
 869                                 }
 870
 871                                 locp[1] = (uint8_t)eval;
 872                                 locp[2] |= (uint8_t)(eval >> 8);
 873                                 break;
 874
 875                         // This is 8-bit immediate short data
 876                         // which goes into the middle byte of a DSP word.
 877                         case FU_DSPIMM8:
 878                                 if (eval >= 0x100)
 879                                 {
 880                                         error("immediate out of range ($0-$FF)");
 881                                         break;
 882                                 }
 883
 884                                 locp[1] = (uint8_t)eval;
 885                                 break;
 886
 887                         // This is a 6 bit absoulte short address. It occupies
 888                         // the low 6 bits of the middle byte of a DSP word.
 889                         case FU_DSPADR06:
 890                                 if (eval > 63)
 891                                 {
 892                                         error("address must be between 0 and 63");
 893                                         break;
 894                                 }
 895
 896                                 locp[1] |= eval;
 897                                 break;
 898
 899                         // This is a 6 bit absoulte short address. It occupies
 900                         // the low 6 bits of the middle byte of a DSP word.
 901                         case FU_DSPPP06:
 902                                 if (eval < 0xFFFFFFC0)
 903                                 {
 904                                         error("address must be between $FFC0 and $FFFF");
 905                                         break;
 906                                 }
 907
 908                                 locp[1] |= eval & 0x3F;
 909                                 break;
 910
 911                         // Shamus: I'm pretty sure these don't make any sense...
 912                         case FU_DSPIMMFL8:
 913                                 warn("FU_DSPIMMFL8 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 914                                 break;
 915
 916                         case FU_DSPIMMFL16:
 917                                 warn("FU_DSPIMMFL16 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 918                                 break;
 919
 920                         case FU_DSPIMMFL24:
 921                                 warn("FU_DSPIMMFL24 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 922                                 break;
 923
 924                         // Bad fixup type--this should *never* happen!
 925                         default:
 926                                 interror(4);
 927                                 // NOTREACHED
 928                         }
 929                         break;
 930
 931                 // Fixup a 4-byte float
 932                 case FU_FLOATSING:
 933                         warn("FU_FLOATSING missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 934                         break;
 935
 936                 // Fixup a 8-byte float
 937                 case FU_FLOATDOUB:
 938                         warn("FU_FLOATDOUB missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 939                         break;
 940
 941                 // Fixup a 12-byte float
 942                 case FU_FLOATEXT:
 943                         warn("FU_FLOATEXT missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 944                         break;
 945
 946                 default:
 947                         // Bad fixup type--this should *never* happen!
 948                         // Once we call this function, it winds down immediately; it
 949                         // doesn't return.
 950                         interror(4);
 951                 }
 952
 953                 continue;
 954 rangeErr:
 955                 error("expression out of range");
 956         }
 957
 958         return 0;
 959 }
 960
 961
 962 //
 963 // Resolve all fixups
 964 //
 965 int ResolveAllFixups(void)
 966 {
 967         // Make undefined symbols GLOBL
 968         if (glob_flag)
 969                 ForceUndefinedSymbolsGlobal();
 970
 971         DEBUG printf("Resolving TEXT sections...\n");
 972         ResolveFixups(TEXT);
 973         DEBUG printf("Resolving DATA sections...\n");
 974         ResolveFixups(DATA);
 975         DEBUG printf("Resolving 6502 sections...\n");
 976         ResolveFixups(M6502);           // Fixup 6502 section (if any)
 977         DEBUG printf("Resolving DSP56001 P: sections...\n");
 978         ResolveFixups(M56001P);         // Fixup 56001 P: section (if any)
 979         DEBUG printf("Resolving DSP56001 X: sections...\n");
 980         ResolveFixups(M56001X);         // Fixup 56001 X: section (if any)
 981         DEBUG printf("Resolving DSP56001 Y: sections...\n");
 982         ResolveFixups(M56001Y);         // Fixup 56001 Y: section (if any)
 983
 984         return 0;
 985 }
 986