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                         if (optim_pc)
 420                                 if (eattr & REFERENCED)
 421                                         if (eattr & DEFINED)
 422                                                 if (!(eattr & EQUATED))
 423                                                 {
 424                                                         error("relocation not allowed");
 425                                                         continue;
 426                                                 }
 427                 }
 428                 // Simple symbol
 429                 else
 430                 {
 431                         SYM * sy = fup->symbol;
 432                         eattr = sy->sattr;
 433
 434                         if (optim_pc)
 435                                 if (eattr & REFERENCED)
 436                                         if (eattr & DEFINED)
 437                                                 if (!(eattr & EQUATED))
 438                                                 {
 439                                                         error("relocation not allowed");
 440                                                         continue;
 441                                                 }
 442
 443                         if (eattr & DEFINED)
 444                                 eval = sy->svalue;
 445                         else
 446                                 eval = 0;
 447
 448                         // If the symbol is not defined, but global, set esym to sy
 449                         if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
 450                                 esym = sy;
 451
 452                         DEBUG { printf("               name: %s, value: $%" PRIX64 "\n", sy->sname, sy->svalue); }
 453                 }
 454
 455                 uint16_t tdb = eattr & TDB;
 456
 457                 // If the expression/symbol is undefined and no external symbol is
 458                 // involved, then that's an error.
 459                 if (!(eattr & DEFINED) && (esym == NULL))
 460                 {
 461                         error(undef_error);
 462                         continue;
 463                 }
 464
 465                 // Do the fixup
 466                 //
 467                 // If a PC-relative fixup is undefined, its value is *not* subtracted
 468                 // from the location (that will happen in the linker when the external
 469                 // reference is resolved).
 470                 //
 471                 // PC-relative fixups must be DEFINED and either in the same section
 472                 // (whereupon the subtraction takes place) or ABS (with no subtract).
 473                 if ((dw & FU_PCREL) || (dw & FU_PCRELX))
 474                 {
 475                         if (eattr & DEFINED)
 476                         {
 477                                 if (tdb == sno)
 478                                 {
 479                                         eval -= loc;
 480
 481                                         // In this instruction the PC is located a DWORD away
 482                                         if (dw & FU_PCRELX)
 483                                                 eval += 2;
 484                                 }
 485                                 else if (tdb)
 486                                 {
 487                                         // Allow cross-section PCREL fixups in Alcyon mode
 488                                         if (prg_flag || (obj_format == RAW))
 489                                         {
 490                                                 switch (tdb)
 491                                                 {
 492                                                 case TEXT:
 493 // Shouldn't there be a break here, since otherwise, it will point to the DATA section?
 494 //                                                      break;
 495                                                 case DATA:
 496                                                         eval += sect[TEXT].sloc;
 497                                                         break;
 498                                                 case BSS:
 499                                                         eval += sect[TEXT].sloc + sect[DATA].sloc;
 500                                                         break;
 501                                                 default:
 502                                                         error("invalid section");
 503                                                 break;
 504                                                 }
 505
 506                                                 eval -= loc;
 507
 508                                                 // In this instruction the PC is located a DWORD away
 509                                                 if (dw & FU_PCRELX)
 510                                                         eval += 2;
 511                                         }
 512                                         else
 513                                         {
 514                                                 error("PC-relative expr across sections");
 515                                                 continue;
 516                                         }
 517                                 }
 518
 519                                 if (sbra_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
 520                                         warn("unoptimized short branch");
 521                         }
 522
 523                         // Be sure to clear any TDB flags, since we handled it just now
 524                         tdb = 0;
 525                         eattr &= ~TDB;
 526                 }
 527
 528                 // Handle fixup classes
 529                 switch (dw & FUMASK)
 530                 {
 531                 // FU_BBRA fixes up a one-byte branch offset.
 532                 case FU_BBRA:
 533                         if (!(eattr & DEFINED))
 534                         {
 535                                 error("external short branch");
 536                                 continue;
 537                         }
 538
 539                         eval -= 2;
 540
 541                         if (eval + 0x80 >= 0x100)
 542                                 goto rangeErr;
 543
 544                         if (eval == 0)
 545                         {
 546                                 if (CHECK_OPTS(OPT_NULL_BRA))
 547                                 {
 548                                         // Just output a NOP
 549                                         *locp++ = 0x4E;
 550                                         *locp = 0x71;
 551                                         continue;
 552                                 }
 553                                 else
 554                                 {
 555                                         error("illegal bra.s with zero offset");
 556                                         continue;
 557                                 }
 558                         }
 559
 560                         *++locp = (uint8_t)eval;
 561                         break;
 562
 563                 // Fixup one-byte value at locp + 1.
 564                 case FU_WBYTE:
 565                         locp++;
 566                         // FALLTHROUGH
 567
 568                 // Fixup one-byte forward references
 569                 case FU_BYTE:
 570                         if (!(eattr & DEFINED))
 571                         {
 572                                 error("external byte reference");
 573                                 continue;
 574                         }
 575
 576                         if (tdb)
 577                         {
 578                                 error("non-absolute byte reference");
 579                                 continue;
 580                         }
 581
 582                         if ((dw & FU_PCREL) && ((eval + 0x80) >= 0x100))
 583                                 goto rangeErr;
 584
 585                         if (dw & FU_SEXT)
 586                         {
 587                                 if ((eval + 0x100) >= 0x200)
 588                                         goto rangeErr;
 589                         }
 590                         else if (eval >= 0x100)
 591                                 goto rangeErr;
 592
 593                         *locp = (uint8_t)eval;
 594                         break;
 595
 596                 // Fixup high/low byte off word for 6502
 597                 case FU_BYTEH:
 598                         if (!(eattr & DEFINED))
 599                         {
 600                                 error("external byte reference");
 601                                 continue;
 602                         }
 603
 604                         *locp = (uint8_t)(eval >> 8);
 605                         break;
 606
 607                 case FU_BYTEL:
 608                         if (!(eattr & DEFINED))
 609                         {
 610                                 error("external byte reference");
 611                                 continue;
 612                         }
 613
 614                         *locp = (uint8_t)eval;
 615                         break;
 616
 617                 // Fixup WORD forward references; the word could be unaligned in the
 618                 // section buffer, so we have to be careful. (? careful about what?)
 619                 case FU_WORD:
 620                         if ((dw & FUMASKRISC) == FU_JR)
 621                         {
 622                                 int reg = (signed)((eval - ((fup->orgaddr ? fup->orgaddr : loc) + 2)) / 2);
 623
 624                                 if ((reg < -16) || (reg > 15))
 625                                 {
 626                                         error("relative jump out of range");
 627                                         break;
 628                                 }
 629
 630                                 *locp |= ((uint8_t)reg >> 3) & 0x03;
 631                                 locp++;
 632                                 *locp |= ((uint8_t)reg & 0x07) << 5;
 633                                 break;
 634                         }
 635                         else if ((dw & FUMASKRISC) == FU_NUM15)
 636                         {
 637                                 if (((int)eval < -16) || ((int)eval > 15))
 638                                 {
 639                                         error("constant out of range (-16 - +15)");
 640                                         break;
 641                                 }
 642
 643                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 644                                 locp++;
 645                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 646                                 break;
 647                         }
 648                         else if ((dw & FUMASKRISC) == FU_NUM31)
 649                         {
 650                                 if (eval > 31)
 651                                 {
 652                                         error("constant out of range (0-31)");
 653                                         break;
 654                                 }
 655
 656                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 657                                 locp++;
 658                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 659                                 break;
 660                         }
 661                         else if ((dw & FUMASKRISC) == FU_NUM32)
 662                         {
 663                                 if ((eval < 1) || (eval > 32))
 664                                 {
 665                                         error("constant out of range (1-32)");
 666                                         break;
 667                                 }
 668
 669                                 if (dw & FU_SUB32)
 670                                         eval = (32 - eval);
 671
 672                                 eval = (eval == 32) ? 0 : eval;
 673                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 674                                 locp++;
 675                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 676                                 break;
 677                         }
 678                         else if ((dw & FUMASKRISC) == FU_REGONE)
 679                         {
 680                                 if (eval > 31)
 681                                 {
 682                                         error("register one value out of range");
 683                                         break;
 684                                 }
 685
 686                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
 687                                 locp++;
 688                                 *locp |= ((uint8_t)eval & 0x07) << 5;
 689                                 break;
 690                         }
 691                         else if ((dw & FUMASKRISC) == FU_REGTWO)
 692                         {
 693                                 if (eval > 31)
 694                                 {
 695                                         error("register two value out of range");
 696                                         break;
 697                                 }
 698
 699                                 locp++;
 700                                 *locp |= (uint8_t)eval & 0x1F;
 701                                 break;
 702                         }
 703
 704                         if (!(eattr & DEFINED))
 705                         {
 706                                 flags = MWORD;
 707
 708                                 if (dw & FU_PCREL)
 709                                         flags |= MPCREL;
 710
 711                                 MarkRelocatable(sno, loc, 0, flags, esym);
 712                         }
 713                         else
 714                         {
 715                                 if (tdb)
 716                                         MarkRelocatable(sno, loc, tdb, MWORD, NULL);
 717
 718                                 if (dw & FU_SEXT)
 719                                 {
 720                                         if (eval + 0x10000 >= 0x20000)
 721                                                 goto rangeErr;
 722                                 }
 723                                 else
 724                                 {
 725                                         // Range-check BRA and DBRA
 726                                         if (dw & FU_ISBRA)
 727                                         {
 728                                                 if (eval + 0x8000 >= 0x10000)
 729                                                         goto rangeErr;
 730                                         }
 731                                         else if (eval >= 0x10000)
 732                                                 goto rangeErr;
 733                                 }
 734                         }
 735
 736                         // 6502 words are little endian, so handle that here
 737                         if (sno == M6502)
 738                                 SETLE16(locp, 0, eval)
 739                         else
 740                                 SETBE16(locp, 0, eval)
 741
 742                         break;
 743
 744                 // Fixup LONG forward references; the long could be unaligned in the
 745                 // section buffer, so be careful (again).
 746                 case FU_LONG:
 747                         flags = MLONG;
 748
 749                         if ((dw & FUMASKRISC) == FU_MOVEI)
 750                         {
 751                                 // Long constant in MOVEI # is word-swapped, so fix it here
 752                                 eval = WORDSWAP32(eval);
 753                                 flags |= MMOVEI;
 754                         }
 755
 756                         // If the symbol is undefined, make sure to pass the symbol in
 757                         // to the MarkRelocatable() function.
 758                         if (!(eattr & DEFINED))
 759                                 MarkRelocatable(sno, loc, 0, flags, esym);
 760                         else if (tdb)
 761                                 MarkRelocatable(sno, loc, tdb, flags, NULL);
 762
 763                         SETBE32(locp, 0, eval);
 764                         break;
 765
 766                 // Fixup QUAD forward references (mainly used by the OP assembler)
 767                 case FU_QUAD:
 768                         if (dw & FU_OBJLINK)
 769                         {
 770                                 uint64_t quad = GETBE64(locp, 0);
 771                                 uint64_t addr = eval;
 772
 773 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 774 //                              if (fup->orgaddr)
 775 //                                      addr = fup->orgaddr;
 776
 777                                 eval = (quad & 0xFFFFFC0000FFFFFFLL) | ((addr & 0x3FFFF8) << 21);
 778                         }
 779                         else if (dw & FU_OBJDATA)
 780                         {
 781                                 // If it's in a TEXT or DATA section, be sure to mark for a
 782                                 // fixup later
 783                                 if (tdb)
 784                                         MarkRelocatable(sno, loc, tdb, MQUAD, NULL);
 785
 786                                 uint64_t quad = GETBE64(locp, 0);
 787                                 uint64_t addr = eval;
 788
 789 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
 790 //                              if (fup->orgaddr)
 791 //                                      addr = fup->orgaddr;
 792
 793                                 eval = (quad & 0x000007FFFFFFFFFFLL) | ((addr & 0xFFFFF8) << 40);
 794                         }
 795
 796                         SETBE64(locp, 0, eval);
 797                         break;
 798
 799                 // Fixup a 3-bit "QUICK" reference in bits 9..1
 800                 // (range of 1..8) in a word. [Really bits 1..3 in a byte.]
 801                 case FU_QUICK:
 802                         if (!(eattr & DEFINED))
 803                         {
 804                                 error("External quick reference");
 805                                 continue;
 806                         }
 807
 808                         if ((eval < 1) || (eval > 8))
 809                                 goto rangeErr;
 810
 811                         *locp |= (eval & 7) << 1;
 812                         break;
 813
 814                 // Fix up 6502 funny branch
 815                 case FU_6BRA:
 816                         eval -= (loc + 1);
 817
 818                         if (eval + 0x80 >= 0x100)
 819                                 goto rangeErr;
 820
 821                         *locp = (uint8_t)eval;
 822                         break;
 823
 824                 // Fixup DSP56001 addresses
 825                 case FU_56001:
 826                         switch (dw & FUMASKDSP)
 827                         {
 828                         // DSPIMM5 actually is clamped from 0 to 23 for our purposes
 829                         // and does not use the full 5 bit range.
 830                         case FU_DSPIMM5:
 831                                 if (eval > 23)
 832                                 {
 833                                         error("immediate value must be between 0 and 23");
 834                                         break;
 835                                 }
 836
 837                                 locp[2] |= eval;
 838                                 break;
 839
 840                         // This is a 12-bit address encoded into the lower 12
 841                         // bits of a DSP word
 842                         case FU_DSPADR12:
 843                                 if (eval >= 0x1000)
 844                                 {
 845                                         error("address out of range ($0-$FFF)");
 846                                         break;
 847                                 }
 848
 849                                 locp[1] |= eval >> 8;
 850                                 locp[2] = eval & 0xFF;
 851                                 break;
 852
 853                         // This is a full DSP word containing Effective Address Extension
 854                         case FU_DSPADR24:
 855                         case FU_DSPIMM24:
 856                                 if (eval >= 0x1000000)
 857                                 {
 858                                         error("value out of range ($0-$FFFFFF)");
 859                                         break;
 860                                 }
 861
 862                                 locp[0] = (uint8_t)((eval >> 16) & 0xFF);
 863                                 locp[1] = (uint8_t)((eval >> 8) & 0xFF);
 864                                 locp[2] = (uint8_t)(eval & 0xFF);
 865                                 break;
 866
 867                         // This is a 16bit absolute address into a 24bit field
 868                         case FU_DSPADR16:
 869                                 if (eval >= 0x10000)
 870                                 {
 871                                         error("address out of range ($0-$FFFF)");
 872                                         break;
 873                                 }
 874
 875                                 locp[1] = (uint8_t)(eval >> 8);
 876                                 locp[2] = (uint8_t)eval;
 877                                 break;
 878
 879                         // This is 12-bit immediate short data
 880                         // The upper nibble goes into the last byte's low nibble
 881                         // while the remainder 8 bits go into the 2nd byte.
 882                         case FU_DSPIMM12:
 883                                 if (eval >= 0x1000)
 884                                 {
 885                                         error("immediate out of range ($0-$FFF)");
 886                                         break;
 887                                 }
 888
 889                                 locp[1] = (uint8_t)eval;
 890                                 locp[2] |= (uint8_t)(eval >> 8);
 891                                 break;
 892
 893                         // This is 8-bit immediate short data
 894                         // which goes into the middle byte of a DSP word.
 895                         case FU_DSPIMM8:
 896                                 if (eval >= 0x100)
 897                                 {
 898                                         error("immediate out of range ($0-$FF)");
 899                                         break;
 900                                 }
 901
 902                                 locp[1] = (uint8_t)eval;
 903                                 break;
 904
 905                         // This is a 6 bit absoulte short address. It occupies
 906                         // the low 6 bits of the middle byte of a DSP word.
 907                         case FU_DSPADR06:
 908                                 if (eval > 63)
 909                                 {
 910                                         error("address must be between 0 and 63");
 911                                         break;
 912                                 }
 913
 914                                 locp[1] |= eval;
 915                                 break;
 916
 917                         // This is a 6 bit absoulte short address. It occupies
 918                         // the low 6 bits of the middle byte of a DSP word.
 919                         case FU_DSPPP06:
 920                                 if (eval < 0xFFFFFFC0)
 921                                 {
 922                                         error("address must be between $FFC0 and $FFFF");
 923                                         break;
 924                                 }
 925
 926                                 locp[1] |= eval & 0x3F;
 927                                 break;
 928
 929                         // Shamus: I'm pretty sure these don't make any sense...
 930                         case FU_DSPIMMFL8:
 931                                 warn("FU_DSPIMMFL8 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 932                                 break;
 933
 934                         case FU_DSPIMMFL16:
 935                                 warn("FU_DSPIMMFL16 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 936                                 break;
 937
 938                         case FU_DSPIMMFL24:
 939                                 warn("FU_DSPIMMFL24 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 940                                 break;
 941
 942                         // Bad fixup type--this should *never* happen!
 943                         default:
 944                                 interror(4);
 945                                 // NOTREACHED
 946                         }
 947                         break;
 948
 949                 // Fixup a 4-byte float
 950                 case FU_FLOATSING:
 951                         warn("FU_FLOATSING missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 952                         break;
 953
 954                 // Fixup a 8-byte float
 955                 case FU_FLOATDOUB:
 956                         warn("FU_FLOATDOUB missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 957                         break;
 958
 959                 // Fixup a 12-byte float
 960                 case FU_FLOATEXT:
 961                         warn("FU_FLOATEXT missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
 962                         break;
 963
 964                 default:
 965                         // Bad fixup type--this should *never* happen!
 966                         // Once we call this function, it winds down immediately; it
 967                         // doesn't return.
 968                         interror(4);
 969                 }
 970
 971                 continue;
 972 rangeErr:
 973                 error("expression out of range");
 974         }
 975
 976         return 0;
 977 }
 978
 979
 980 //
 981 // Resolve all fixups
 982 //
 983 int ResolveAllFixups(void)
 984 {
 985         // Make undefined symbols GLOBL
 986         if (glob_flag)
 987                 ForceUndefinedSymbolsGlobal();
 988
 989         DEBUG printf("Resolving TEXT sections...\n");
 990         ResolveFixups(TEXT);
 991         DEBUG printf("Resolving DATA sections...\n");
 992         ResolveFixups(DATA);
 993         DEBUG printf("Resolving 6502 sections...\n");
 994         ResolveFixups(M6502);           // Fixup 6502 section (if any)
 995         DEBUG printf("Resolving DSP56001 P: sections...\n");
 996         ResolveFixups(M56001P);         // Fixup 56001 P: section (if any)
 997         DEBUG printf("Resolving DSP56001 X: sections...\n");
 998         ResolveFixups(M56001X);         // Fixup 56001 X: section (if any)
 999         DEBUG printf("Resolving DSP56001 Y: sections...\n");
1000         ResolveFixups(M56001Y);         // Fixup 56001 Y: section (if any)
1001
1002         return 0;
1003 }
1004