Long forgotten helper script which is used to create tables for VS builds
[rmac] / sect.c
1 //
2 // RMAC - Reboot's Macro Assembler for all Atari computers
3 // SECT.C - Code Generation, Fixups and Section Management
4 // Copyright (C) 199x Landon Dyer, 2011-2019 Reboot and Friends
5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
6 // Source utilised with the kind permission of Landon Dyer
7 //
8
9 #include "sect.h"
10 #include "6502.h"
11 #include "direct.h"
12 #include "dsp56k.h"
13 #include "error.h"
14 #include "expr.h"
15 #include "listing.h"
16 #include "mach.h"
17 #include "mark.h"
18 #include "riscasm.h"
19 #include "symbol.h"
20 #include "token.h"
21
22
23 // Function prototypes
24 void MakeSection(int, uint16_t);
25 void SwitchSection(int);
26
27 // Section descriptors
28 SECT sect[NSECTS];              // All sections...
29 int cursect;                    // Current section number
30
31 // These are copied from the section descriptor, the current code chunk
32 // descriptor and the current fixup chunk descriptor when a switch is made into
33 // a section. They are copied back to the descriptors when the section is left.
34 uint16_t scattr;                // Section attributes
35 uint32_t sloc;                  // Current loc in section
36
37 CHUNK * scode;                  // Current (last) code chunk
38 uint32_t challoc;               // # bytes alloc'd to code chunk
39 uint32_t ch_size;               // # bytes used in code chunk
40 uint8_t * chptr;                // Deposit point in code chunk buffer
41 uint8_t * chptr_opcode; // Backup of chptr, updated before entering code generators
42
43 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
44 // associated with a location.
45 static uint8_t fusiztab[] = {
46         0,      // FU_QUICK
47         1,      // FU_BYTE
48         2,      // FU_WORD
49         2,      // FU_WBYTE
50         4,      // FU_LONG
51         1,      // FU_BBRA
52         0,      // (unused)
53         1,      // FU_6BRA
54 };
55
56 // Offset to REAL fixup location
57 static uint8_t fusizoffs[] = {
58         0,      // FU_QUICK
59         0,      // FU_BYTE
60         0,      // FU_WORD
61         1,      // FU_WBYTE
62         0,      // FU_LONG
63         1,      // FU_BBRA
64         0,      // (unused)
65         0,      // FU_6BRA
66 };
67
68
69 //
70 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
71 //
72 void InitSection(void)
73 {
74         // Initialize all sections
75         for(int i=0; i<NSECTS; i++)
76                 MakeSection(i, 0);
77
78         // Construct default sections, make TEXT the current section
79         MakeSection(ABS,     SUSED | SABS | SBSS);      // ABS
80         MakeSection(TEXT,    SUSED | TEXT       );      // TEXT
81         MakeSection(DATA,    SUSED | DATA       );      // DATA
82         MakeSection(BSS,     SUSED | BSS  | SBSS);      // BSS
83         MakeSection(M6502,   SUSED | TEXT       );      // 6502 code section
84         MakeSection(M56001P, SUSED | SABS       );      // DSP 56001 Program RAM
85         MakeSection(M56001X, SUSED | SABS       );      // DSP 56001 X RAM
86         MakeSection(M56001Y, SUSED | SABS       );      // DSP 56001 Y RAM
87
88         // Switch to TEXT for starters
89         SwitchSection(TEXT);
90 }
91
92
93 //
94 // Make a new (clean) section
95 //
96 void MakeSection(int sno, uint16_t attr)
97 {
98         SECT * sp = &sect[sno];
99         sp->scattr = attr;
100         sp->sloc = 0;
101         sp->orgaddr = 0;
102         sp->scode = sp->sfcode = NULL;
103         sp->sfix = sp->sffix = NULL;
104 }
105
106
107 //
108 // Switch to another section (copy section & chunk descriptors to global vars
109 // for fast access)
110 //
111 void SwitchSection(int sno)
112 {
113         CHUNK * cp;
114         cursect = sno;
115         SECT * sp = &sect[sno];
116
117         m6502 = (sno == M6502); // Set 6502-mode flag
118
119         // Copy section vars
120         scattr = sp->scattr;
121         sloc = sp->sloc;
122         scode = sp->scode;
123         orgaddr = sp->orgaddr;
124
125         // Copy code chunk vars
126         if ((cp = scode) != NULL)
127         {
128                 challoc = cp->challoc;
129                 ch_size = cp->ch_size;
130                 chptr = cp->chptr + ch_size;
131
132                 // For 6502 mode, add the last org'd address
133 // Why?
134 /*
135 Because the way this is set up it treats the 6502 assembly space as a single 64K space (+ 16 bytes, for some unknown reason) and just bobbles around inside that space and uses a stack of org "pointers" to show where the data ended up.
136
137 This is a shitty way to handle things, and we can do better than this!  :-P
138
139 Really, there's no reason to have the 6502 (or DSP56001 for that matter) have their own private sections for this kind of thing, as there's literally *no* chance that it would be mingled with 68K+ code.  It should be able to use the TEXT, DATA & BSS sections just like the 68K.
140
141 Or should it?  After looking at the code, maybe it's better to keep the 56001 sections segregated from the rest.  But we can still make the 6502 stuff better.
142 */
143                 if (m6502)
144                         chptr = cp->chptr + orgaddr;
145         }
146         else
147                 challoc = ch_size = 0;
148 }
149
150
151 //
152 // Save current section
153 //
154 void SaveSection(void)
155 {
156         SECT * sp = &sect[cursect];
157
158         sp->scattr = scattr;                    // Bailout section vars
159         sp->sloc = sloc;
160         sp->orgaddr = orgaddr;
161
162         if (scode != NULL)                              // Bailout code chunk (if any)
163                 scode->ch_size = ch_size;
164 }
165
166
167 //
168 // Test to see if a location has a fixup set on it. This is used by the
169 // listing generator to print 'xx's instead of '00's for forward references
170 //
171 int fixtest(int sno, uint32_t loc)
172 {
173         // Force update to sect[] variables
174         StopMark();
175
176         // Ugly linear search for a mark on our location. The speed doesn't
177         // matter, since this is only done when generating a listing, which is
178         // SLOW anyway.
179         for(FIXUP * fp=sect[sno].sffix; fp!=NULL; fp=fp->next)
180         {
181                 uint32_t w = fp->attr;
182                 uint32_t xloc = fp->loc + (int)fusizoffs[w & FUMASK];
183
184                 if (xloc == loc)
185                         return (int)fusiztab[w & FUMASK];
186         }
187
188         return 0;
189 }
190
191
192 //
193 // Check that there are at least 'amt' bytes left in the current chunk. If
194 // there are not, allocate another chunk of at least CH_CODE_SIZE bytes or
195 // 'amt', whichever is larger.
196 //
197 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
198 //
199 void chcheck(uint32_t amt)
200 {
201         DEBUG { printf("chcheck(%u)\n", amt); }
202
203         // If in BSS section, no allocation required
204         if (scattr & SBSS)
205                 return;
206
207         if (amt == 0)
208                 amt = CH_THRESHOLD;
209
210         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc - ch_size); }
211
212         if ((int)(challoc - ch_size) >= (int)amt)
213                 return;
214
215         if (amt < CH_CODE_SIZE)
216                 amt = CH_CODE_SIZE;
217
218         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
219         SECT * p = &sect[cursect];
220         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
221         int first = 0;
222
223         if (scode == NULL)
224         {
225                 // First chunk in section
226                 cp->chprev = NULL;
227                 p->sfcode = cp;
228                 first = 1;
229         }
230         else
231         {
232                 // Add second and on to previous chunk
233                 cp->chprev = scode;
234                 scode->chnext = cp;
235                 scode->ch_size = ch_size;       // Save old chunk's globals
236         }
237
238         // Setup chunk and global vars
239 /*
240 So, whenever there's an ORG in a 56K section, it sets sloc TO THE ADDRESS IN THE ORG.  Also, the loc/sloc are incremented by 1s, which means to alias correctly to the byte-oriented memory model we have here, we have to fix that kind of crap.
241 */
242         cp->chloc = sloc; // <-- HERE'S THE PROBLEM FOR 56K  :-/
243         cp->chnext = NULL;
244         challoc = cp->challoc = amt;
245         ch_size = cp->ch_size = 0;
246         chptr = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK);
247         scode = p->scode = cp;
248
249         // A quick kludge
250 /*
251 OK, so this is a bit shite, but at least it gets things working the way they should.  The right way to do this is not rely on sloc & friends for the right fixup address but to have an accurate model of the thing.  That will probably come with v2.0.1  :-P
252
253 So the problem is, d_org sets sloc to the address of the ORG statement, and that gives an incorrect base for the fixup.  And so when a second (or later) chunk is allocated, it gets set wrong.  Further complicating things is that the orgaddress *does not* get used in a typical way with the DSP56001 code, and, as such, causes incorrect addresses to be generated.  All that has to be dealt with in order to get this right and do away with this kludge.
254 */
255         if (((cursect == M56001P) || (cursect == M56001X) || (cursect == M56001Y)) && !first)
256                 cp->chloc = cp->chprev->chloc + cp->chprev->ch_size;
257
258         return;
259 }
260
261
262 //
263 // Arrange for a fixup on a location
264 //
265 int AddFixup(uint32_t attr, uint32_t loc, TOKEN * fexpr)
266 {
267         uint16_t exprlen = 0;
268         SYM * symbol = NULL;
269         uint32_t _orgaddr = 0;
270
271         // First, check to see if the expression is a bare label, otherwise, force
272         // the FU_EXPR flag into the attributes and count the tokens.
273         if ((fexpr[0] == SYMBOL) && (fexpr[2] == ENDEXPR))
274         {
275                 symbol = symbolPtr[fexpr[1]];
276
277                 // Save the org address for JR RISC instruction
278                 if ((attr & FUMASKRISC) == FU_JR)
279                         _orgaddr = orgaddr;
280         }
281         else
282         {
283                 attr |= FU_EXPR;
284                 exprlen = ExpressionLength(fexpr);
285         }
286
287         // Second, check to see if it's a DSP56001 fixup, and force the FU_56001
288         // flag into the attributes if so; also save the current org address.
289         if (attr & FUMASKDSP)
290         {
291                 attr |= FU_56001;
292                 // Save the exact spot in this chunk where the fixup should go
293                 _orgaddr = chptr - scode->chptr + scode->chloc;
294         }
295
296         // Allocate space for the fixup + any expression
297         FIXUP * fixup = malloc(sizeof(FIXUP) + (sizeof(TOKEN) * exprlen));
298
299         // Store the relevant fixup information in the FIXUP
300         fixup->next = NULL;
301         fixup->attr = attr;
302         fixup->loc = loc;
303         fixup->fileno = cfileno;
304         fixup->lineno = curlineno;
305         fixup->expr = NULL;
306         fixup->symbol = symbol;
307         fixup->orgaddr = _orgaddr;
308
309         // Copy the passed in expression to the FIXUP, if any
310         if (exprlen > 0)
311         {
312                 fixup->expr = (TOKEN *)((uint8_t *)fixup + sizeof(FIXUP));
313                 memcpy(fixup->expr, fexpr, sizeof(TOKEN) * exprlen);
314         }
315
316         // Finally, put the FIXUP in the current section's linked list
317         if (sect[cursect].sffix == NULL)
318         {
319                 sect[cursect].sffix = fixup;
320                 sect[cursect].sfix = fixup;
321         }
322         else
323         {
324                 sect[cursect].sfix->next = fixup;
325                 sect[cursect].sfix = fixup;
326         }
327
328         DEBUG { printf("AddFixup: sno=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", cursect, fixup->lineno, fixup->attr, fixup->loc, (void *)fixup->expr, (void *)fixup->symbol, fixup->orgaddr);
329                 if (symbol != NULL)
330                         printf("          name: %s, value: $%lX\n", symbol->sname, symbol->svalue);
331         }
332
333         return 0;
334 }
335
336
337 //
338 // Resolve fixups in the passed in section
339 //
340 int ResolveFixups(int sno)
341 {
342         SECT * sc = &sect[sno];
343
344         // "Cache" first chunk
345         CHUNK * cch = sc->sfcode;
346
347         // Can't fixup a section with nothing in it
348         if (cch == NULL)
349                 return 0;
350
351         // Wire the 6502 segment's size to its allocated size (64K)
352         if (sno == M6502)
353                 cch->ch_size = cch->challoc;
354
355         // Get first fixup for the passed in section
356         FIXUP * fixup = sect[sno].sffix;
357
358         while (fixup != NULL)
359         {
360                 // We do it this way because we have continues everywhere... :-P
361                 FIXUP * fup = fixup;
362                 fixup = fixup->next;
363
364                 uint32_t dw = fup->attr;        // Fixup long (type + modes + flags)
365                 uint32_t loc = fup->loc;        // Location to fixup
366                 cfileno = fup->fileno;
367                 curlineno = fup->lineno;
368                 DEBUG { printf("ResolveFixups: sect#=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", sno, fup->lineno, fup->attr, fup->loc, (void *)fup->expr, (void *)fup->symbol, fup->orgaddr); }
369
370                 // This is based on global vars cfileno, curfname :-P
371                 // This approach is kinda meh as well. I think we can do better
372                 // than this.
373                 SetFilenameForErrorReporting();
374
375                 if ((sno == M56001P) || (sno == M56001X) || (sno == M56001Y) || (sno == M56001L))
376                         loc = fup->orgaddr;
377
378                 // Search for chunk containing location to fix up; compute a
379                 // pointer to the location (in the chunk). Often we will find the
380                 // Fixup is in the "cached" chunk, so the linear-search is seldom
381                 // executed.
382                 if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
383                 {
384                         for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
385                         {
386                                 if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
387                                         break;
388                         }
389
390                         if (cch == NULL)
391                         {
392                                 // Fixup (loc) is out of range--this should never happen!
393                                 // Once we call this function, it winds down immediately; it
394                                 // doesn't return.
395                                 interror(7);
396                         }
397                 }
398
399                 // Location to fix (in current chunk)
400                 // We use the address of the chunk that loc is actually in, then
401                 // subtract the chunk's starting location from loc to get the offset
402                 // into the current chunk.
403                 uint8_t * locp = cch->chptr + (loc - cch->chloc);
404
405                 uint16_t eattr = 0;                     // Expression attrib
406                 SYM * esym = NULL;                      // External symbol involved in expr
407                 uint64_t eval;                          // Expression value
408                 uint16_t flags;                         // Mark flags
409
410                 // Compute expression/symbol value and attributes
411
412                 // Complex expression
413                 if (dw & FU_EXPR)
414                 {
415                         // evexpr presumably issues the errors/warnings here
416                         if (evexpr(fup->expr, &eval, &eattr, &esym) != OK)
417                                 continue;
418                 }
419                 // Simple symbol
420                 else
421                 {
422                         SYM * sy = fup->symbol;
423                         eattr = sy->sattr;
424
425                         if (eattr & DEFINED)
426                                 eval = sy->svalue;
427                         else
428                                 eval = 0;
429
430                         // If the symbol is not defined, but global, set esym to sy
431                         if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
432                                 esym = sy;
433
434                         DEBUG { printf("               name: %s, value: $%" PRIX64 "\n", sy->sname, sy->svalue); }
435                 }
436
437                 uint16_t tdb = eattr & TDB;
438
439                 // If the expression/symbol is undefined and no external symbol is
440                 // involved, then that's an error.
441                 if (!(eattr & DEFINED) && (esym == NULL))
442                 {
443                         error(undef_error);
444                         continue;
445                 }
446
447                 // Do the fixup
448                 //
449                 // If a PC-relative fixup is undefined, its value is *not* subtracted
450                 // from the location (that will happen in the linker when the external
451                 // reference is resolved).
452                 //
453                 // MWC expects PC-relative things to have the LOC subtracted from the
454                 // value, if the value is external (that is, undefined at this point).
455                 //
456                 // PC-relative fixups must be DEFINED and either in the same section
457                 // (whereupon the subtraction takes place) or ABS (with no subtract).
458                 if ((dw & FU_PCREL) || (dw & FU_PCRELX))
459                 {
460                         if (eattr & DEFINED)
461                         {
462                                 if (tdb == sno)
463                                 {
464                                         eval -= loc;
465
466                                         // In this instruction the PC is located a DWORD away
467                                         if (dw & FU_PCRELX)
468                                                 eval += 2;
469                                 }
470                                 else if (tdb)
471                                 {
472                                         // Allow cross-section PCREL fixups in Alcyon mode
473                                         if (prg_flag)
474                                         {
475                                                 switch (tdb)
476                                                 {
477                                                 case TEXT:
478 // Shouldn't there be a break here, since otherwise, it will point to the DATA section?
479 //                                                      break;
480                                                 case DATA:
481                                                         eval += sect[TEXT].sloc;
482                                                         break;
483                                                 case BSS:
484                                                         eval += sect[TEXT].sloc + sect[DATA].sloc;
485                                                         break;
486                                                 default:
487                                                         error("invalid section");
488                                                 break;
489                                                 }
490
491                                                 eval -= loc;
492
493                                                 // In this instruction the PC is located a DWORD away
494                                                 if (dw & FU_PCRELX)
495                                                         eval += 2;
496                                         }
497                                         else
498                                         {
499                                                 error("PC-relative expr across sections");
500                                                 continue;
501                                         }
502                                 }
503
504                                 if (sbra_flag && (dw & FU_LBRA) && (eval + 0x80 < 0x100))
505                                         warn("unoptimized short branch");
506                         }
507                         else if (obj_format == MWC)
508                         {
509                                 eval -= loc;
510
511                                 // In this instruction the PC is located a DWORD away
512                                 if (dw & FU_PCRELX)
513                                         eval += 2;
514                         }
515
516                         // Be sure to clear any TDB flags, since we handled it just now
517                         tdb = 0;
518                         eattr &= ~TDB;
519                 }
520
521                 // Handle fixup classes
522                 switch (dw & FUMASK)
523                 {
524                 // FU_BBRA fixes up a one-byte branch offset.
525                 case FU_BBRA:
526                         if (!(eattr & DEFINED))
527                         {
528                                 error("external short branch");
529                                 continue;
530                         }
531
532                         eval -= 2;
533
534                         if (eval + 0x80 >= 0x100)
535                                 goto rangeErr;
536
537                         if (eval == 0)
538                         {
539                                 if (CHECK_OPTS(OPT_NULL_BRA))
540                                 {
541                                         // Just output a NOP
542                                         *locp++ = 0x4E;
543                                         *locp = 0x71;
544                                         continue;
545                                 }
546                                 else
547                                 {
548                                         error("illegal bra.s with zero offset");
549                                         continue;
550                                 }
551                         }
552
553                         *++locp = (uint8_t)eval;
554                         break;
555
556                 // Fixup one-byte value at locp + 1.
557                 case FU_WBYTE:
558                         locp++;
559                         // FALLTHROUGH
560
561                 // Fixup one-byte forward references
562                 case FU_BYTE:
563                         if (!(eattr & DEFINED))
564                         {
565                                 error("external byte reference");
566                                 continue;
567                         }
568
569                         if (tdb)
570                         {
571                                 error("non-absolute byte reference");
572                                 continue;
573                         }
574
575                         if ((dw & FU_PCREL) && ((eval + 0x80) >= 0x100))
576                                 goto rangeErr;
577
578                         if (dw & FU_SEXT)
579                         {
580                                 if ((eval + 0x100) >= 0x200)
581                                         goto rangeErr;
582                         }
583                         else if (eval >= 0x100)
584                                 goto rangeErr;
585
586                         *locp = (uint8_t)eval;
587                         break;
588
589                 // Fixup high/low byte off word for 6502
590                 case FU_BYTEH:
591                         if (!(eattr & DEFINED))
592                         {
593                                 error("external byte reference");
594                                 continue;
595                         }
596
597                         *locp = (uint8_t)(eval >> 8);
598                         break;
599
600                 case FU_BYTEL:
601                         if (!(eattr & DEFINED))
602                         {
603                                 error("external byte reference");
604                                 continue;
605                         }
606
607                         *locp = (uint8_t)eval;
608                         break;
609
610                 // Fixup WORD forward references; the word could be unaligned in the
611                 // section buffer, so we have to be careful. (? careful about what?)
612                 case FU_WORD:
613                         if ((dw & FUMASKRISC) == FU_JR)
614                         {
615                                 int reg = (signed)((eval - ((fup->orgaddr ? fup->orgaddr : loc) + 2)) / 2);
616
617                                 if ((reg < -16) || (reg > 15))
618                                 {
619                                         error("relative jump out of range");
620                                         break;
621                                 }
622
623                                 *locp |= ((uint8_t)reg >> 3) & 0x03;
624                                 locp++;
625                                 *locp |= ((uint8_t)reg & 0x07) << 5;
626                                 break;
627                         }
628                         else if ((dw & FUMASKRISC) == FU_NUM15)
629                         {
630                                 if (((int)eval < -16) || ((int)eval > 15))
631                                 {
632                                         error("constant out of range (-16 - +15)");
633                                         break;
634                                 }
635
636                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
637                                 locp++;
638                                 *locp |= ((uint8_t)eval & 0x07) << 5;
639                                 break;
640                         }
641                         else if ((dw & FUMASKRISC) == FU_NUM31)
642                         {
643                                 if (eval > 31)
644                                 {
645                                         error("constant out of range (0-31)");
646                                         break;
647                                 }
648
649                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
650                                 locp++;
651                                 *locp |= ((uint8_t)eval & 0x07) << 5;
652                                 break;
653                         }
654                         else if ((dw & FUMASKRISC) == FU_NUM32)
655                         {
656                                 if ((eval < 1) || (eval > 32))
657                                 {
658                                         error("constant out of range (1-32)");
659                                         break;
660                                 }
661
662                                 if (dw & FU_SUB32)
663                                         eval = (32 - eval);
664
665                                 eval = (eval == 32) ? 0 : eval;
666                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
667                                 locp++;
668                                 *locp |= ((uint8_t)eval & 0x07) << 5;
669                                 break;
670                         }
671                         else if ((dw & FUMASKRISC) == FU_REGONE)
672                         {
673                                 if (eval > 31)
674                                 {
675                                         error("register one value out of range");
676                                         break;
677                                 }
678
679                                 *locp |= ((uint8_t)eval >> 3) & 0x03;
680                                 locp++;
681                                 *locp |= ((uint8_t)eval & 0x07) << 5;
682                                 break;
683                         }
684                         else if ((dw & FUMASKRISC) == FU_REGTWO)
685                         {
686                                 if (eval > 31)
687                                 {
688                                         error("register two value out of range");
689                                         break;
690                                 }
691
692                                 locp++;
693                                 *locp |= (uint8_t)eval & 0x1F;
694                                 break;
695                         }
696
697                         if (!(eattr & DEFINED))
698                         {
699                                 flags = MWORD;
700
701                                 if (dw & FU_PCREL)
702                                         flags |= MPCREL;
703
704                                 MarkRelocatable(sno, loc, 0, flags, esym);
705                         }
706                         else
707                         {
708                                 if (tdb)
709                                         MarkRelocatable(sno, loc, tdb, MWORD, NULL);
710
711                                 if (dw & FU_SEXT)
712                                 {
713                                         if (eval + 0x10000 >= 0x20000)
714                                                 goto rangeErr;
715                                 }
716                                 else
717                                 {
718                                         // Range-check BRA and DBRA
719                                         if (dw & FU_ISBRA)
720                                         {
721                                                 if (eval + 0x8000 >= 0x10000)
722                                                         goto rangeErr;
723                                         }
724                                         else if (eval >= 0x10000)
725                                                 goto rangeErr;
726                                 }
727                         }
728
729                         // 6502 words are little endian, so handle that here
730                         if (sno == M6502)
731                                 SETLE16(locp, 0, eval)
732                         else
733                                 SETBE16(locp, 0, eval)
734
735                         break;
736
737                 // Fixup LONG forward references; the long could be unaligned in the
738                 // section buffer, so be careful (again).
739                 case FU_LONG:
740                         flags = MLONG;
741
742                         if ((dw & FUMASKRISC) == FU_MOVEI)
743                         {
744                                 // Long constant in MOVEI # is word-swapped, so fix it here
745                                 eval = WORDSWAP32(eval);
746                                 flags |= MMOVEI;
747                         }
748
749                         // If the symbol is undefined, make sure to pass the symbol in
750                         // to the MarkRelocatable() function.
751                         if (!(eattr & DEFINED))
752                                 MarkRelocatable(sno, loc, 0, flags, esym);
753                         else if (tdb)
754                                 MarkRelocatable(sno, loc, tdb, flags, NULL);
755
756                         SETBE32(locp, 0, eval);
757                         break;
758
759                 // Fixup QUAD forward references (mainly used by the OP assembler)
760                 case FU_QUAD:
761                         if (dw & FU_OBJLINK)
762                         {
763                                 uint64_t quad = GETBE64(locp, 0);
764                                 uint64_t addr = eval;
765
766 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
767 //                              if (fup->orgaddr)
768 //                                      addr = fup->orgaddr;
769
770                                 eval = (quad & 0xFFFFFC0000FFFFFFLL) | ((addr & 0x3FFFF8) << 21);
771                         }
772                         else if (dw & FU_OBJDATA)
773                         {
774                                 // If it's in a TEXT or DATA section, be sure to mark for a
775                                 // fixup later
776                                 if (tdb)
777                                         MarkRelocatable(sno, loc, tdb, MQUAD, NULL);
778
779                                 uint64_t quad = GETBE64(locp, 0);
780                                 uint64_t addr = eval;
781
782 //Hmm, not sure how this can be set, since it's only set if it's a DSP56001 fixup or a FU_JR...  :-/
783 //                              if (fup->orgaddr)
784 //                                      addr = fup->orgaddr;
785
786                                 eval = (quad & 0x000007FFFFFFFFFFLL) | ((addr & 0xFFFFF8) << 40);
787                         }
788
789                         SETBE64(locp, 0, eval);
790                         break;
791
792                 // Fixup a 3-bit "QUICK" reference in bits 9..1
793                 // (range of 1..8) in a word. [Really bits 1..3 in a byte.]
794                 case FU_QUICK:
795                         if (!(eattr & DEFINED))
796                         {
797                                 error("External quick reference");
798                                 continue;
799                         }
800
801                         if ((eval < 1) || (eval > 8))
802                                 goto rangeErr;
803
804                         *locp |= (eval & 7) << 1;
805                         break;
806
807                 // Fix up 6502 funny branch
808                 case FU_6BRA:
809                         eval -= (loc + 1);
810
811                         if (eval + 0x80 >= 0x100)
812                                 goto rangeErr;
813
814                         *locp = (uint8_t)eval;
815                         break;
816
817                 // Fixup DSP56001 addresses
818                 case FU_56001:
819                         switch (dw & FUMASKDSP)
820                         {
821                         // DSPIMM5 actually is clamped from 0 to 23 for our purposes
822                         // and does not use the full 5 bit range.
823                         case FU_DSPIMM5:
824                                 if (eval > 23)
825                                 {
826                                         error("immediate value must be between 0 and 23");
827                                         break;
828                                 }
829
830                                 locp[2] |= eval;
831                                 break;
832
833                         // This is a 12-bit address encoded into the lower 12
834                         // bits of a DSP word
835                         case FU_DSPADR12:
836                                 if (eval >= 0x1000)
837                                 {
838                                         error("address out of range ($0-$FFF)");
839                                         break;
840                                 }
841
842                                 locp[1] |= eval >> 8;
843                                 locp[2] = eval & 0xFF;
844                                 break;
845
846                         // This is a full DSP word containing Effective Address Extension
847                         case FU_DSPADR24:
848                         case FU_DSPIMM24:
849                                 if (eval >= 0x1000000)
850                                 {
851                                         error("value out of range ($0-$FFFFFF)");
852                                         break;
853                                 }
854
855                                 locp[0] = (uint8_t)((eval >> 16) & 0xFF);
856                                 locp[1] = (uint8_t)((eval >> 8) & 0xFF);
857                                 locp[2] = (uint8_t)(eval & 0xFF);
858                                 break;
859
860                         // This is a 16bit absolute address into a 24bit field
861                         case FU_DSPADR16:
862                                 if (eval >= 0x10000)
863                                 {
864                                         error("address out of range ($0-$FFFF)");
865                                         break;
866                                 }
867
868                                 locp[1] = (uint8_t)(eval >> 8);
869                                 locp[2] = (uint8_t)eval;
870                                 break;
871
872                         // This is 12-bit immediate short data
873                         // The upper nibble goes into the last byte's low nibble
874                         // while the remainder 8 bits go into the 2nd byte.
875                         case FU_DSPIMM12:
876                                 if (eval >= 0x1000)
877                                 {
878                                         error("immediate out of range ($0-$FFF)");
879                                         break;
880                                 }
881
882                                 locp[1] = (uint8_t)eval;
883                                 locp[2] |= (uint8_t)(eval >> 8);
884                                 break;
885
886                         // This is 8-bit immediate short data
887                         // which goes into the middle byte of a DSP word.
888                         case FU_DSPIMM8:
889                                 if (eval >= 0x100)
890                                 {
891                                         error("immediate out of range ($0-$FF)");
892                                         break;
893                                 }
894
895                                 locp[1] = (uint8_t)eval;
896                                 break;
897
898                         // This is a 6 bit absoulte short address. It occupies
899                         // the low 6 bits of the middle byte of a DSP word.
900                         case FU_DSPADR06:
901                                 if (eval > 63)
902                                 {
903                                         error("address must be between 0 and 63");
904                                         break;
905                                 }
906
907                                 locp[1] |= eval;
908                                 break;
909
910                         // This is a 6 bit absoulte short address. It occupies
911                         // the low 6 bits of the middle byte of a DSP word.
912                         case FU_DSPPP06:
913                                 if (eval < 0xFFFFFFC0)
914                                 {
915                                         error("address must be between $FFC0 and $FFFF");
916                                         break;
917                                 }
918
919                                 locp[1] |= eval & 0x3F;
920                                 break;
921
922                         // Shamus: I'm pretty sure these don't make any sense...
923                         case FU_DSPIMMFL8:
924                                 warn("FU_DSPIMMFL8 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
925                                 break;
926
927                         case FU_DSPIMMFL16:
928                                 warn("FU_DSPIMMFL16 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
929                                 break;
930
931                         case FU_DSPIMMFL24:
932                                 warn("FU_DSPIMMFL24 missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
933                                 break;
934
935                         // Bad fixup type--this should *never* happen!
936                         default:
937                                 interror(4);
938                                 // NOTREACHED
939                         }
940                         break;
941
942                 // Fixup a 4-byte float
943                 case FU_FLOATSING:
944                         warn("FU_FLOATSING missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
945                         break;
946
947                 // Fixup a 8-byte float
948                 case FU_FLOATDOUB:
949                         warn("FU_FLOATDOUB missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
950                         break;
951
952                 // Fixup a 12-byte float
953                 case FU_FLOATEXT:
954                         warn("FU_FLOATEXT missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
955                         break;
956
957                 default:
958                         // Bad fixup type--this should *never* happen!
959                         // Once we call this function, it winds down immediately; it
960                         // doesn't return.
961                         interror(4);
962                 }
963
964                 continue;
965 rangeErr:
966                 error("expression out of range");
967         }
968
969         return 0;
970 }
971
972
973 //
974 // Resolve all fixups
975 //
976 int ResolveAllFixups(void)
977 {
978         // Make undefined symbols GLOBL
979         if (glob_flag)
980                 ForceUndefinedSymbolsGlobal();
981
982         DEBUG printf("Resolving TEXT sections...\n");
983         ResolveFixups(TEXT);
984         DEBUG printf("Resolving DATA sections...\n");
985         ResolveFixups(DATA);
986         DEBUG printf("Resolving 6502 sections...\n");
987         ResolveFixups(M6502);           // Fixup 6502 section (if any)
988         DEBUG printf("Resolving DSP56001 P: sections...\n");
989         ResolveFixups(M56001P);         // Fixup 56001 P: section (if any)
990         DEBUG printf("Resolving DSP56001 X: sections...\n");
991         ResolveFixups(M56001X);         // Fixup 56001 X: section (if any)
992         DEBUG printf("Resolving DSP56001 Y: sections...\n");
993         ResolveFixups(M56001Y);         // Fixup 56001 Y: section (if any)
994
995         return 0;
996 }
997