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