Misc. whitespace cleanups, removal of unneeded code.
[rmac] / sect.c
1 //
2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
3 // SECT.C - Code Generation, Fixups and Section Management
4 // Copyright (C) 199x Landon Dyer, 2011 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 "direct.h"
11 #include "error.h"
12 #include "expr.h"
13 #include "listing.h"
14 #include "mach.h"
15 #include "mark.h"
16 #include "riscasm.h"
17 #include "symbol.h"
18 #include "token.h"
19
20
21 // Function prototypes
22 void MakeSection(int, WORD);
23 void SwitchSection(int);
24
25 // Section descriptors
26 SECT sect[NSECTS];              // All sections... 
27 int cursect;                    // Current section number
28
29 // These are copied from the section descriptor, the current code chunk
30 // descriptor and the current fixup chunk descriptor when a switch is made into
31 // a section.  They are copied back to the descriptors when the section is left.
32 WORD scattr;                    // Section attributes 
33 LONG sloc;                              // Current loc in section 
34
35 CHUNK * scode;                  // Current (last) code chunk 
36 LONG challoc;                   // # bytes alloc'd to code chunk 
37 LONG ch_size;                   // # bytes used in code chunk 
38 char * chptr;                   // Deposit point in code chunk buffer 
39
40 CHUNK * sfix;                   // Current (last) fixup chunk
41 LONG fchalloc;                  // # bytes alloc'd to fixup chunk
42 LONG fchsize;                   // # bytes used in fixup chunk
43 PTR fchptr;                             // Deposit point in fixup chunk buffer
44
45 // Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is
46 // associated with a location.
47 static char fusiztab[] = {
48    0,   // FU_QUICK
49    1,   // FU_BYTE
50    2,   // FU_WORD
51    2,   // FU_WBYTE
52    4,   // FU_LONG
53    1,   // FU_BBRA
54    0,   // (unused)
55    1,   // FU_6BRA
56 };
57
58 // Offset to REAL fixup location
59 static char fusizoffs[] = {
60    0,   // FU_QUICK
61    0,   // FU_BYTE
62    0,   // FU_WORD
63    1,   // FU_WBYTE
64    0,   // FU_LONG
65    1,   // FU_BBRA
66    0,   // (unused)
67    0,   // FU_6BRA
68 };
69
70
71 //
72 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
73 //
74 void InitSection(void)
75 {
76         int i;
77
78         // Cleanup all sections
79         for(i=0; i<NSECTS; i++)
80                 MakeSection(i, 0);
81
82         // Construct default sections, make TEXT the current section
83         MakeSection(ABS,   SUSED | SABS | SBSS);                // ABS
84         MakeSection(TEXT,  SUSED | TEXT       );                // TEXT
85         MakeSection(DATA,  SUSED | DATA       );                // DATA
86         MakeSection(BSS,   SUSED | BSS  | SBSS);                // BSS
87 //      MakeSection(M6502, SUSED | TEXT       );                // 6502 code section
88
89         // Switch to TEXT for starters
90         SwitchSection(TEXT);
91 }
92
93
94 //
95 // Make a new (clean) section
96 //
97 void MakeSection(int sno, WORD attr)
98 {
99         SECT * p = &sect[sno];
100         p->scattr = attr;
101         p->sloc = 0;
102         p->scode = p->sfcode = NULL;
103         p->sfix = p->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 * p = &sect[sno];
116
117         // Copy section vars
118         scattr = p->scattr;
119         sloc = p->sloc;
120         scode = p->scode;
121         sfix = p->sfix;
122
123         // Copy code chunk vars
124         if ((cp = scode) != NULL)
125         {
126                 challoc = cp->challoc;
127                 ch_size = cp->ch_size;
128                 chptr = cp->chptr + ch_size;
129         }
130         else
131                 challoc = ch_size = 0;
132
133         // Copy fixup chunk vars 
134         if ((cp = sfix) != NULL)
135         {
136                 fchalloc = cp->challoc;
137                 fchsize = cp->ch_size;
138                 fchptr.cp = cp->chptr + fchsize;
139         }
140         else
141                 fchalloc = fchsize = 0;
142 }
143
144
145 //
146 // Save current section
147 //
148 void SaveSection(void)
149 {
150         SECT * p = &sect[cursect];
151
152         p->scattr = scattr;                                             // Bailout section vars
153         p->sloc = sloc;
154
155         if (scode != NULL)                                              // Bailout code chunk
156                 scode->ch_size = ch_size;
157
158         if (sfix != NULL)                                               // Bailout fixup chunk
159                 sfix->ch_size = fchsize;
160 }
161
162
163 //
164 // Test to see if a location has a fixup sic'd on it.  This is used by the
165 // listing generator to print 'xx's instead of '00's for forward references
166 //
167 int fixtest(int sno, LONG loc)
168 {
169         CHUNK * ch;
170         PTR fup;
171         char * fuend;
172         WORD w;
173         LONG xloc;
174
175         // Force update to sect[] variables
176         StopMark();
177
178         // Hairy, ugly linear search for a mark on our location; the speed doesn't
179         // matter, since this is only done when generating a listing, which is
180         // SLOW.
181         for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
182         {
183                 fup.cp = (char *)ch->chptr;
184                 fuend = fup.cp + ch->ch_size;
185
186                 while (fup.cp < fuend)
187                 {
188                         w = *fup.wp++;
189                         xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
190                         fup.wp += 2;
191
192                         if (xloc == loc)
193                                 return (int)fusiztab[w & FUMASK];
194
195                         if (w & FU_EXPR)
196                         {
197                                 w = *fup.wp++;
198                                 fup.lp += w;
199                         }
200                         else
201                                 fup.lp++;
202                 }
203         }
204
205         return 0;
206 }
207
208
209 // 
210 // Check that there are at least 'amt' bytes left in the current chunk. If
211 // there are not, allocate another chunk of at least 'amt' bytes (and probably
212 // more).
213 // 
214 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
215 //
216 int chcheck(LONG amt)
217 {
218         DEBUG { printf("chcheck(%u)\n", amt); }
219         // If in BSS section, no allocation required
220         if (scattr & SBSS)
221                 return 0;
222
223         if (!amt)
224                 amt = CH_THRESHOLD;
225
226         DEBUG { printf("    challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); }
227         if ((int)(challoc - ch_size) >= (int)amt) 
228                 return 0;
229
230         if (amt < CH_CODE_SIZE)
231                 amt = CH_CODE_SIZE;
232
233         DEBUG { printf("    amt (adjusted)=%u\n", amt); }
234         SECT * p = &sect[cursect];
235         CHUNK * cp = malloc(sizeof(CHUNK) + amt);
236
237         // First chunk in section
238         if (scode == NULL)
239         {
240                 cp->chprev = NULL;
241                 p->sfcode = cp;
242         }
243         // Add chunk to other chunks
244         else
245         {
246                 cp->chprev = scode;
247                 scode->chnext = cp;
248                 scode->ch_size = ch_size;                       // Save old chunk's globals 
249         }
250
251         // Setup chunk and global vars
252         cp->chloc = sloc;
253         cp->chnext = NULL;
254         challoc = cp->challoc = amt;
255         ch_size = cp->ch_size = 0;
256         chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK);
257         scode = p->scode = cp;
258
259         return 0;
260 }
261
262
263 // This is really wrong. We need to make some proper structures here so we
264 // don't have to count sizes of objects, that's what the compiler's for! :-P
265 #define FIXUP_BASE_SIZE (sizeof(WORD) + sizeof(LONG) + sizeof(WORD) + sizeof(WORD))
266 //
267 // Arrange for a fixup on a location
268 //
269 int AddFixup(WORD attr, LONG loc, TOKEN * fexpr)
270 {
271         LONG i;
272         LONG len = 0;
273         CHUNK * cp;
274         SECT * p;
275         // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
276         //         this.
277 #warning "!!! AddFixup() is filled with VOODOO !!!"
278         DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
279
280         // Compute length of expression (could be faster); determine if it's the
281         // single-symbol case; no expression if it's just a mark. This code assumes
282         // 16 bit WORDs and 32 bit LONGs
283         if (*fexpr == SYMBOL && fexpr[2] == ENDEXPR)
284         {
285                 // Just a single symbol
286                 // SCPCD : correct bit mask for attr (else other FU_xxx will match) 
287                 // NYAN !
288                 if ((attr & FUMASKRISC) == FU_JR)
289                 {
290 //                      i = 18;
291 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
292                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
293                 }
294                 else
295                 {
296 //                      i = 14;
297                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
298                 }
299         }
300         else
301         {
302                 attr |= FU_EXPR;
303
304                 for(len=0; fexpr[len]!=ENDEXPR; len++)
305                 {
306                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
307                                 len++;
308                 }
309
310                 len++;                                                          // Add 1 for ENDEXPR 
311 //              i = (len << 2) + 12;
312                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
313         }
314
315         // Maybe alloc another fixup chunk for this one to fit in
316         if ((fchalloc - fchsize) < i)
317         {
318                 p = &sect[cursect];
319                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
320
321                 // First fixup chunk in section
322                 if (sfix == NULL)
323                 {
324                         cp->chprev = NULL;
325                         p->sffix = cp;
326                 }
327                 // Add to other chunks
328                 else
329                 {
330                         cp->chprev = sfix;
331                         sfix->chnext = cp;
332                         sfix->ch_size = fchsize;
333                 }
334
335                 // Setup fixup chunk and its global vars
336                 cp->chnext = NULL;
337                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
338                 fchsize = cp->ch_size = 0;
339                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
340                 sfix = p->sfix = cp;
341         }
342
343         // Record fixup type, fixup location, and the file number and line number
344         // the fixup is located at.
345         *fchptr.wp++ = attr;
346         *fchptr.lp++ = loc;
347         *fchptr.wp++ = cfileno;
348         *fchptr.wp++ = (WORD)curlineno;
349
350         // Store postfix expression or pointer to a single symbol, or nothing for a
351         // mark.
352         if (attr & FU_EXPR)
353         {
354                 *fchptr.wp++ = (WORD)len;
355
356                 while (len--)
357                         *fchptr.lp++ = (LONG)*fexpr++;
358         }
359         else
360         {
361 //              *fchptr.lp++ = (LONG)fexpr[1];
362                 *fchptr.sy++ = symbolPtr[fexpr[1]];
363         }
364
365         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
366         if ((attr & FUMASKRISC) == FU_JR)
367         {
368                 if (orgactive)
369                         *fchptr.lp++ = orgaddr;
370                 else
371                         *fchptr.lp++ = 0x00000000;
372         }
373
374         fchsize += i;
375         return 0;
376 }
377
378
379 //
380 // Resolve all fixups
381 //
382 int ResolveAllFixups(void)
383 {
384         unsigned i;
385         char buf[EBUFSIZ];
386
387         // Make undefined symbols GLOBL
388         if (glob_flag)
389                 ForceUndefinedSymbolsGlobal();
390
391         DEBUG printf("Resolving TEXT sections...\n");
392         ResolveFixups(TEXT);
393         DEBUG printf("Resolving DATA sections...\n");
394         ResolveFixups(DATA);
395
396         return 0;
397 }
398
399
400 //
401 // Resolve fixups in a section
402 //
403 int ResolveFixups(int sno)
404 {
405         PTR fup;                                        // Current fixup
406         WORD * fuend;                           // End of last fixup (in this chunk)
407         WORD w;                                         // Fixup word (type+modes+flags)
408         char * locp;                            // Location to fix (in cached chunk) 
409         LONG loc;                                       // Location to fixup
410         VALUE eval;                                     // Expression value 
411         WORD eattr;                                     // Expression attrib
412         SYM * esym;                                     // External symbol involved in expr
413         SYM * sy;                                       // (Temp) pointer to a symbol
414         WORD i;                                         // (Temp) word
415         WORD tdb;                                       // eattr & TDB
416         LONG oaddr;
417         int reg2;
418         WORD flags;
419         unsigned page_jump = 0;
420         unsigned address = 0;
421         unsigned j;
422         char buf[EBUFSIZ];
423         
424         SECT * sc = &sect[sno];
425         CHUNK * ch = sc->sffix;
426
427         if (ch == NULL)
428                 return 0;
429
430         // "Cache" first chunk
431         CHUNK * cch = sc->sfcode;
432
433         // Can't fixup a section with nothing in it
434         if (cch == NULL)
435                 return 0;
436
437         do
438         {
439                 fup.cp = ch->chptr;                                     // fup -> start of chunk
440                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
441
442                 while (fup.wp < fuend)
443                 {
444                         w = *fup.wp++;
445                         loc = *fup.lp++;
446                         cfileno = *fup.wp++;
447                         curlineno = (int)*fup.wp++;
448 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
449                         // This is based on global vars cfileno, curfname :-P
450                         // This approach is kinda meh as well. I think we can do better than this.
451                         SetFilenameForErrorReporting();
452
453                         esym = NULL;
454
455                         // Search for chunk containing location to fix up; compute a
456                         // pointer to the location (in the chunk). Often we will find the
457                         // fixup is in the "cached" chunk, so the linear-search is seldom
458                         // executed.
459                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
460                         {
461                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
462                                 {
463                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
464                                                 break;
465                                 }
466
467                                 if (cch == NULL)
468                                 {
469                                         // Fixup (loc) out of range 
470                                         interror(7);
471                                         // NOTREACHED
472                                 }
473                         }
474
475                         locp = cch->chptr + (loc - cch->chloc);
476                         eattr = 0;
477
478                         // Compute expression/symbol value and attribs
479                         // Complex expression
480                         if (w & FU_EXPR)
481                         {
482                                 i = *fup.wp++;
483
484                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
485                                 {
486                                         fup.lp += i;
487                                         continue;
488                                 }
489
490                                 fup.lp += i;
491                         }
492                         // Simple symbol
493                         else
494                         {
495                                 sy = *fup.sy++;
496                                 eattr = sy->sattr;
497
498                                 if (eattr & DEFINED)
499                                         eval = sy->svalue;
500                                 else
501                                         eval = 0;
502
503                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
504                                         esym = sy;
505                         }
506
507                         tdb = (WORD)(eattr & TDB);
508
509                         // If the expression is undefined and no external symbol is
510                         // involved, then it's an error.
511                         if (!(eattr & DEFINED) && (esym == NULL))
512                         {
513                                 error(undef_error);
514                                 continue;
515                         }
516
517 // It seems that this is completely unnecessary!
518 #if 0
519                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
520 //{
521 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
522                                 esym->sattre |= RISCSYM;
523 //}
524 #endif
525
526                         // Do the fixup
527                         // 
528                         // If a PC-relative fixup is undefined, its value is *not*
529                         // subtracted from the location (that will happen in the linker
530                         // when the external reference is resolved).
531                         // 
532                         // MWC expects PC-relative things to have the LOC subtracted from
533                         // the value, if the value is external (that is, undefined at this
534                         // point).
535                         // 
536                         // PC-relative fixups must be DEFINED and either in the same
537                         // section (whereupon the subtraction takes place) or ABS (with no
538                         // subtract).
539                         if (w & FU_PCREL)
540                         {
541                                 if (eattr & DEFINED)
542                                 {
543                                         if (tdb == sno)
544                                                 eval -= (VALUE)loc;
545                                         else if (tdb)
546                                         {
547                                                 error("PC-relative expr across sections");
548                                                 continue;
549                                         }
550
551                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
552                                                 warn("unoptimized short branch");
553                                 }
554                                 else if (obj_format == MWC)
555                                         eval -= (VALUE)loc;
556
557                                 tdb = 0;
558                                 eattr &= ~TDB;
559                         }
560
561                         // Do fixup classes
562                         switch ((int)(w & FUMASK))
563                         {
564                         // FU_BBRA fixes up a one-byte branch offset.
565                         case FU_BBRA:
566                                 if (!(eattr & DEFINED))
567                                 {
568                                         error("external short branch");
569                                         continue;
570                                 }
571
572                                 eval -= 2;
573
574                                 if (eval + 0x80 >= 0x100)
575                                         goto range;
576
577                                 if (eval == 0)
578                                 {
579                                         error("illegal bra.s with zero offset");
580                                         continue;
581                                 }
582
583                                 *++locp = (char)eval;
584                                 break;
585                         // Fixup one-byte value at locp + 1.
586                         case FU_WBYTE:
587                                 locp++;
588                                 // FALLTHROUGH
589                         // Fixup one-byte forward references
590                         case FU_BYTE:
591                                 if (!(eattr & DEFINED))
592                                 {
593                                         error("external byte reference");
594                                         continue;
595                                 }
596
597                                 if (tdb)
598                                 {
599                                         error("non-absolute byte reference");
600                                         continue;
601                                 }
602
603                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
604                                         goto range;
605
606                                 if (w & FU_SEXT)
607                                 {
608                                         if (eval + 0x100 >= 0x200)
609                                                 goto range;
610                                 }
611                                 else if (eval >= 0x100)
612                                         goto range;
613
614                                 *locp = (char)eval;
615                                 break;
616                         // Fixup WORD forward references; 
617                         // the word could be unaligned in the section buffer, so we have to
618                         // be careful.
619                         case FU_WORD:
620                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
621                                 {
622                                         oaddr = *fup.lp++;
623
624                                         if (oaddr)
625                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
626                                         else
627                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
628
629 #if 0
630                                         if ((w & 0x0F00) == FU_MJR)
631                                         {
632                                                 // Main code destination alignment checking here for
633                                                 // forward declared labels
634                                                 address = (oaddr) ? oaddr : loc;
635
636                                                 if (((address >= 0xF03000) && (address < 0xF04000)
637                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
638                                                         && (eval < 0xF04000) && (address < 0xF03000)))
639                                                 {
640                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
641                                                                 "main memory and local gpu ram", address);
642                                                 }
643                                                 else
644                                                 {
645                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
646
647                                                         if (page_jump)
648                                                         {
649                                                                 // This jump is to a page outside of the
650                                                                 // current 256 byte page
651                                                                 if (eval % 4)
652                                                                 {
653                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
654                                                                 }
655                                                         }
656                                                         else
657                                                         {
658                                                                 // This jump is in the current 256 byte page
659                                                                 if ((eval - 2) % 4)
660                                                                 {
661                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
662                                                                 }
663                                                         }
664                                                 }
665                                         }
666 #endif
667
668                                         if ((reg2 < -16) || (reg2 > 15))
669                                         {
670                                                 error("relative jump out of range");
671                                                 break;
672                                         }
673
674                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
675                                         locp++;
676                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
677                                         break;
678                                 }
679
680                                 if ((w & FUMASKRISC) == FU_NUM15)
681                                 {
682                                         if (eval < -16 || eval > 15)
683                                         {
684                                                 error("constant out of range");
685                                                 break;
686                                         }
687
688                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
689                                         locp++;
690                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
691                                         break;
692                                 }
693
694                                 if ((w & FUMASKRISC) == FU_NUM31)
695                                 {
696                                         if (eval < 0 || eval > 31)
697                                         {
698                                                 error("constant out of range");
699                                                 break;
700                                         }
701
702                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
703                                         locp++;
704                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
705                                         break;
706                                 }
707
708                                 if ((w & FUMASKRISC) == FU_NUM32)
709                                 {
710                                         if (eval < 1 || eval > 32)
711                                         {
712                                                 error("constant out of range");
713                                                 break;
714                                         }
715
716                                         if (w & FU_SUB32)
717                                                 eval = (32 - eval);
718
719                                         eval = (eval == 32) ? 0 : eval;
720                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
721                                         locp++;
722                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
723                                         break;
724                                 }
725
726                                 if ((w & FUMASKRISC) == FU_REGONE)
727                                 {
728                                         if (eval < 0 || eval > 31)
729                                         {
730                                                 error("register value out of range");
731                                                 break;
732                                         }
733
734                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
735                                         locp++;
736                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
737                                         break;
738                                 }
739
740                                 if ((w & FUMASKRISC) == FU_REGTWO)
741                                 {
742                                         if (eval < 0 || eval > 31)
743                                         {
744                                                 error("register value out of range");
745                                                 break;
746                                         }
747
748                                         locp++;
749                                         *locp = (char)(*locp | (eval & 0x1F));
750                                         break;
751                                 }
752
753                                 if (!(eattr & DEFINED))
754                                 {
755                                         if (w & FU_PCREL)
756                                                 w = MPCREL | MWORD;
757                                         else
758                                                 w = MWORD;
759
760                                         rmark(sno, loc, 0, w, esym);
761                                 }
762                                 else
763                                 {
764                                         if (tdb)
765                                                 rmark(sno, loc, tdb, MWORD, NULL);
766
767                                         if (w & FU_SEXT)
768                                         {
769                                                 if (eval + 0x10000 >= 0x20000)
770                                                         goto range;
771                                         }
772                                         else
773                                         {
774                                                 // Range-check BRA and DBRA
775                                                 if (w & FU_ISBRA)
776                                                 {
777                                                         if (eval + 0x8000 >= 0x10000)
778                                                         goto range;
779                                                 }
780                                                 else if (eval >= 0x10000)
781                                                         goto range;
782                                         }
783                                 }
784
785                                 *locp++ = (char)(eval >> 8);
786                                 *locp = (char)eval;
787                                 break;
788                         // Fixup LONG forward references;
789                         // the long could be unaligned in the section buffer, so be careful
790                         // (again).
791                         case FU_LONG:
792                                 if ((w & FUMASKRISC) == FU_MOVEI)
793                                 {
794 #if 0
795                                         address = loc + 4;
796
797                                         if (eattr & DEFINED)
798                                         {
799                                                 for(j=0; j<fwindex; j++)
800                                                 {
801                                                         if (fwdjump[j] == address)
802                                                         {
803                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
804
805                                                                 if (page_jump)
806                                                                 {
807                                                                         if (eval % 4)
808                                                                         {
809                                                                                 err_setup();
810                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
811
812                                                                                 if (listing > 0)
813                                                                                         ship_ln(buf);
814
815                                                                                 if (err_flag)
816                                                                                         write(err_fd, buf, (LONG)strlen(buf));
817                                                                                 else
818                                                                                         printf("%s\n", buf);
819                                                                         }          
820                                                                 }
821                                                                 else
822                                                                 {
823                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
824                                                                         {
825                                                                                 err_setup();
826                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
827
828                                                                                 if (listing > 0)
829                                                                                         ship_ln(buf);
830
831                                                                                 if (err_flag)
832                                                                                         write(err_fd, buf, (LONG)strlen(buf));
833                                                                                 else
834                                                                                         printf("%s\n", buf);
835                                                                         }          
836                                                                 }
837
838                                                                 // Clear this jump as it has been checked
839                                                                 fwdjump[j] = 0;
840                                                                 j = fwindex;
841                                                         }
842                                                 }
843                                         }
844 #endif
845
846                                         // Long constant in MOVEI # is word-swapped, so fix it here
847                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
848                                         flags = (MLONG | MMOVEI);
849                                 }
850                                 else
851                                         flags = MLONG;
852
853                                 if (!(eattr & DEFINED))
854                                 {
855 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
856                                         rmark(sno, loc, 0, flags, esym);
857                                 }
858                                 else if (tdb)
859                                 {
860 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
861                                         rmark(sno, loc, tdb, flags, NULL);
862                                 }
863 //else
864 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
865
866                                 *locp++ = (char)(eval >> 24);
867                                 *locp++ = (char)(eval >> 16);
868                                 *locp++ = (char)(eval >> 8);
869                                 *locp = (char)eval;
870                                 break;
871
872                         // Fixup a 3-bit "QUICK" reference in bits 9..1
873                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
874                         case FU_QUICK:
875                                 if (!(eattr & DEFINED))
876                                 {
877                                         error("External quick reference");
878                                         continue;
879                                 }
880
881                                 if (eval < 1 || eval > 8)
882                                         goto range;
883
884                                 *locp |= (eval & 7) << 1;
885                                 break;
886
887                         // Fix up 6502 funny branch
888                         case FU_6BRA:
889                                 eval -= (loc + 1);
890
891                                 if (eval + 0x80 >= 0x100)
892                                         goto range;
893
894                                 *locp = (char)eval;
895                                 break;
896
897                         default:
898                                 interror(4);                                 // Bad fixup type
899                                 // NOTREACHED
900                         }
901                         continue;
902 range:
903                         error("expression out of range");
904                 }
905
906                 ch = ch->chnext;
907         }
908         while (ch != NULL);
909
910         return 0;
911 }
912