Removed spurious printf.
[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 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR)\n");
291 //                      i = 18;
292 //                      i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
293                         i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
294                 }
295                 else
296                 {
297 //printf("AddFixup: ((attr & FUMASKRISC) == FU_JR) ELSE\n");
298 //                      i = 14;
299                         i = FIXUP_BASE_SIZE + sizeof(SYM *);
300                 }
301         }
302         else
303         {
304 //printf("AddFixup: !SYMBOL\n");
305                 attr |= FU_EXPR;
306
307                 for(len=0; fexpr[len]!=ENDEXPR; len++)
308                 {
309                         if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
310                                 len++;
311                 }
312
313                 len++;                                                          // Add 1 for ENDEXPR 
314 //              i = (len << 2) + 12;
315                 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
316         }
317
318         // Alloc another fixup chunk for this one to fit in if necessary
319         if ((fchalloc - fchsize) < i)
320         {
321                 p = &sect[cursect];
322                 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
323
324                 // First fixup chunk in section
325                 if (sfix == NULL)
326                 {
327                         cp->chprev = NULL;
328                         p->sffix = cp;
329                 }
330                 // Add to other chunks
331                 else
332                 {
333                         cp->chprev = sfix;
334                         sfix->chnext = cp;
335                         sfix->ch_size = fchsize;
336                 }
337
338                 // Setup fixup chunk and its global vars
339                 cp->chnext = NULL;
340                 fchalloc = cp->challoc = CH_FIXUP_SIZE;
341                 fchsize = cp->ch_size = 0;
342                 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
343                 sfix = p->sfix = cp;
344         }
345
346         // Record fixup type, fixup location, and the file number and line number
347         // the fixup is located at.
348         *fchptr.wp++ = attr;
349         *fchptr.lp++ = loc;
350         *fchptr.wp++ = cfileno;
351         *fchptr.wp++ = (WORD)curlineno;
352
353         // Store postfix expression or pointer to a single symbol, or nothing for a
354         // mark.
355         if (attr & FU_EXPR)
356         {
357                 *fchptr.wp++ = (WORD)len;
358
359                 while (len--)
360                         *fchptr.lp++ = (LONG)*fexpr++;
361         }
362         else
363         {
364 //              *fchptr.lp++ = (LONG)fexpr[1];
365                 *fchptr.sy++ = symbolPtr[fexpr[1]];
366 //printf("AddFixup: adding symbol (%s) [%08X]\n", symbolPtr[fexpr[1]]->sname, symbolPtr[fexpr[1]]->sattr);
367         }
368
369         // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
370         if ((attr & FUMASKRISC) == FU_JR)
371         {
372                 if (orgactive)
373                         *fchptr.lp++ = orgaddr;
374                 else
375                         *fchptr.lp++ = 0x00000000;
376         }
377
378         fchsize += i;
379         return 0;
380 }
381
382
383 //
384 // Resolve all fixups
385 //
386 int ResolveAllFixups(void)
387 {
388         unsigned i;
389         char buf[EBUFSIZ];
390
391         // Make undefined symbols GLOBL
392         if (glob_flag)
393                 ForceUndefinedSymbolsGlobal();
394
395         DEBUG printf("Resolving TEXT sections...\n");
396         ResolveFixups(TEXT);
397         DEBUG printf("Resolving DATA sections...\n");
398         ResolveFixups(DATA);
399
400         return 0;
401 }
402
403
404 //
405 // Resolve fixups in a section
406 //
407 int ResolveFixups(int sno)
408 {
409         PTR fup;                                // Current fixup
410         WORD * fuend;                   // End of last fixup (in this chunk)
411         WORD w;                                 // Fixup word (type+modes+flags)
412         char * locp;                    // Location to fix (in cached chunk) 
413         LONG loc;                               // Location to fixup
414         VALUE eval;                             // Expression value 
415         WORD eattr;                             // Expression attrib
416         SYM * esym;                             // External symbol involved in expr
417         SYM * sy;                               // (Temp) pointer to a symbol
418         WORD i;                                 // (Temp) word
419         WORD tdb;                               // eattr & TDB
420         LONG oaddr;
421         int reg2;
422         WORD flags;
423         unsigned page_jump = 0;
424         unsigned address = 0;
425         unsigned j;
426         char buf[EBUFSIZ];
427         
428         SECT * sc = &sect[sno];
429         CHUNK * ch = sc->sffix;
430
431         if (ch == NULL)
432                 return 0;
433
434         // "Cache" first chunk
435         CHUNK * cch = sc->sfcode;
436
437         // Can't fixup a section with nothing in it
438         if (cch == NULL)
439                 return 0;
440
441         do
442         {
443                 fup.cp = ch->chptr;                                     // fup -> start of chunk
444                 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
445
446                 while (fup.wp < fuend)
447                 {
448                         w = *fup.wp++;
449                         loc = *fup.lp++;
450                         cfileno = *fup.wp++;
451                         curlineno = (int)*fup.wp++;
452 DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); }
453                         // This is based on global vars cfileno, curfname :-P
454                         // This approach is kinda meh as well. I think we can do better than this.
455                         SetFilenameForErrorReporting();
456
457                         esym = NULL;
458
459                         // Search for chunk containing location to fix up; compute a
460                         // pointer to the location (in the chunk). Often we will find the
461                         // fixup is in the "cached" chunk, so the linear-search is seldom
462                         // executed.
463                         if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
464                         {
465                                 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
466                                 {
467                                         if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
468                                                 break;
469                                 }
470
471                                 if (cch == NULL)
472                                 {
473                                         // Fixup (loc) out of range 
474                                         interror(7);
475                                         // NOTREACHED
476                                 }
477                         }
478
479                         locp = cch->chptr + (loc - cch->chloc);
480                         eattr = 0;
481
482                         // Compute expression/symbol value and attribs
483                         // Complex expression
484                         if (w & FU_EXPR)
485                         {
486                                 i = *fup.wp++;
487
488                                 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
489                                 {
490                                         fup.lp += i;
491                                         continue;
492                                 }
493
494                                 fup.lp += i;
495                         }
496                         // Simple symbol
497                         else
498                         {
499                                 sy = *fup.sy++;
500                                 eattr = sy->sattr;
501
502                                 if (eattr & DEFINED)
503                                         eval = sy->svalue;
504                                 else
505                                         eval = 0;
506
507                                 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
508                                         esym = sy;
509                         }
510
511                         tdb = (WORD)(eattr & TDB);
512
513                         // If the expression is undefined and no external symbol is
514                         // involved, then it's an error.
515                         if (!(eattr & DEFINED) && (esym == NULL))
516                         {
517                                 error(undef_error);
518                                 continue;
519                         }
520
521 // It seems that this is completely unnecessary!
522 #if 0
523                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
524 //{
525 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
526                                 esym->sattre |= RISCSYM;
527 //}
528 #endif
529
530                         // Do the fixup
531                         // 
532                         // If a PC-relative fixup is undefined, its value is *not*
533                         // subtracted from the location (that will happen in the linker
534                         // when the external reference is resolved).
535                         // 
536                         // MWC expects PC-relative things to have the LOC subtracted from
537                         // the value, if the value is external (that is, undefined at this
538                         // point).
539                         // 
540                         // PC-relative fixups must be DEFINED and either in the same
541                         // section (whereupon the subtraction takes place) or ABS (with no
542                         // subtract).
543                         if (w & FU_PCREL)
544                         {
545                                 if (eattr & DEFINED)
546                                 {
547                                         if (tdb == sno)
548                                                 eval -= (VALUE)loc;
549                                         else if (tdb)
550                                         {
551                                                 error("PC-relative expr across sections");
552                                                 continue;
553                                         }
554
555                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
556                                                 warn("unoptimized short branch");
557                                 }
558                                 else if (obj_format == MWC)
559                                         eval -= (VALUE)loc;
560
561                                 tdb = 0;
562                                 eattr &= ~TDB;
563                         }
564
565                         // Do fixup classes
566                         switch ((int)(w & FUMASK))
567                         {
568                         // FU_BBRA fixes up a one-byte branch offset.
569                         case FU_BBRA:
570                                 if (!(eattr & DEFINED))
571                                 {
572                                         error("external short branch");
573                                         continue;
574                                 }
575
576                                 eval -= 2;
577
578                                 if (eval + 0x80 >= 0x100)
579                                         goto range;
580
581                                 if (eval == 0)
582                                 {
583                                         error("illegal bra.s with zero offset");
584                                         continue;
585                                 }
586
587                                 *++locp = (char)eval;
588                                 break;
589                         // Fixup one-byte value at locp + 1.
590                         case FU_WBYTE:
591                                 locp++;
592                                 // FALLTHROUGH
593                         // Fixup one-byte forward references
594                         case FU_BYTE:
595                                 if (!(eattr & DEFINED))
596                                 {
597                                         error("external byte reference");
598                                         continue;
599                                 }
600
601                                 if (tdb)
602                                 {
603                                         error("non-absolute byte reference");
604                                         continue;
605                                 }
606
607                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
608                                         goto range;
609
610                                 if (w & FU_SEXT)
611                                 {
612                                         if (eval + 0x100 >= 0x200)
613                                                 goto range;
614                                 }
615                                 else if (eval >= 0x100)
616                                         goto range;
617
618                                 *locp = (char)eval;
619                                 break;
620                         // Fixup WORD forward references; 
621                         // the word could be unaligned in the section buffer, so we have to
622                         // be careful.
623                         case FU_WORD:
624                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
625                                 {
626                                         oaddr = *fup.lp++;
627
628                                         if (oaddr)
629                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
630                                         else
631                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
632
633 #if 0
634                                         if ((w & 0x0F00) == FU_MJR)
635                                         {
636                                                 // Main code destination alignment checking here for
637                                                 // forward declared labels
638                                                 address = (oaddr) ? oaddr : loc;
639
640                                                 if (((address >= 0xF03000) && (address < 0xF04000)
641                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
642                                                         && (eval < 0xF04000) && (address < 0xF03000)))
643                                                 {
644                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
645                                                                 "main memory and local gpu ram", address);
646                                                 }
647                                                 else
648                                                 {
649                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
650
651                                                         if (page_jump)
652                                                         {
653                                                                 // This jump is to a page outside of the
654                                                                 // current 256 byte page
655                                                                 if (eval % 4)
656                                                                 {
657                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
658                                                                 }
659                                                         }
660                                                         else
661                                                         {
662                                                                 // This jump is in the current 256 byte page
663                                                                 if ((eval - 2) % 4)
664                                                                 {
665                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
666                                                                 }
667                                                         }
668                                                 }
669                                         }
670 #endif
671
672                                         if ((reg2 < -16) || (reg2 > 15))
673                                         {
674                                                 error("relative jump out of range");
675                                                 break;
676                                         }
677
678                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
679                                         locp++;
680                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
681                                         break;
682                                 }
683
684                                 if ((w & FUMASKRISC) == FU_NUM15)
685                                 {
686                                         if (eval < -16 || eval > 15)
687                                         {
688                                                 error("constant out of range");
689                                                 break;
690                                         }
691
692                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
693                                         locp++;
694                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
695                                         break;
696                                 }
697
698                                 if ((w & FUMASKRISC) == FU_NUM31)
699                                 {
700                                         if (eval < 0 || eval > 31)
701                                         {
702                                                 error("constant out of range");
703                                                 break;
704                                         }
705
706                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
707                                         locp++;
708                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
709                                         break;
710                                 }
711
712                                 if ((w & FUMASKRISC) == FU_NUM32)
713                                 {
714                                         if (eval < 1 || eval > 32)
715                                         {
716                                                 error("constant out of range");
717                                                 break;
718                                         }
719
720                                         if (w & FU_SUB32)
721                                                 eval = (32 - eval);
722
723                                         eval = (eval == 32) ? 0 : eval;
724                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
725                                         locp++;
726                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
727                                         break;
728                                 }
729
730                                 if ((w & FUMASKRISC) == FU_REGONE)
731                                 {
732                                         if (eval < 0 || eval > 31)
733                                         {
734                                                 error("register value out of range");
735                                                 break;
736                                         }
737
738                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
739                                         locp++;
740                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
741                                         break;
742                                 }
743
744                                 if ((w & FUMASKRISC) == FU_REGTWO)
745                                 {
746                                         if (eval < 0 || eval > 31)
747                                         {
748                                                 error("register value out of range");
749                                                 break;
750                                         }
751
752                                         locp++;
753                                         *locp = (char)(*locp | (eval & 0x1F));
754                                         break;
755                                 }
756
757                                 if (!(eattr & DEFINED))
758                                 {
759                                         if (w & FU_PCREL)
760                                                 w = MPCREL | MWORD;
761                                         else
762                                                 w = MWORD;
763
764                                         rmark(sno, loc, 0, w, esym);
765                                 }
766                                 else
767                                 {
768                                         if (tdb)
769                                                 rmark(sno, loc, tdb, MWORD, NULL);
770
771                                         if (w & FU_SEXT)
772                                         {
773                                                 if (eval + 0x10000 >= 0x20000)
774                                                         goto range;
775                                         }
776                                         else
777                                         {
778                                                 // Range-check BRA and DBRA
779                                                 if (w & FU_ISBRA)
780                                                 {
781                                                         if (eval + 0x8000 >= 0x10000)
782                                                         goto range;
783                                                 }
784                                                 else if (eval >= 0x10000)
785                                                         goto range;
786                                         }
787                                 }
788
789                                 *locp++ = (char)(eval >> 8);
790                                 *locp = (char)eval;
791                                 break;
792                         // Fixup LONG forward references;
793                         // the long could be unaligned in the section buffer, so be careful
794                         // (again).
795                         case FU_LONG:
796                                 if ((w & FUMASKRISC) == FU_MOVEI)
797                                 {
798 #if 0
799                                         address = loc + 4;
800
801                                         if (eattr & DEFINED)
802                                         {
803                                                 for(j=0; j<fwindex; j++)
804                                                 {
805                                                         if (fwdjump[j] == address)
806                                                         {
807                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
808
809                                                                 if (page_jump)
810                                                                 {
811                                                                         if (eval % 4)
812                                                                         {
813                                                                                 err_setup();
814                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
815
816                                                                                 if (listing > 0)
817                                                                                         ship_ln(buf);
818
819                                                                                 if (err_flag)
820                                                                                         write(err_fd, buf, (LONG)strlen(buf));
821                                                                                 else
822                                                                                         printf("%s\n", buf);
823                                                                         }          
824                                                                 }
825                                                                 else
826                                                                 {
827                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
828                                                                         {
829                                                                                 err_setup();
830                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
831
832                                                                                 if (listing > 0)
833                                                                                         ship_ln(buf);
834
835                                                                                 if (err_flag)
836                                                                                         write(err_fd, buf, (LONG)strlen(buf));
837                                                                                 else
838                                                                                         printf("%s\n", buf);
839                                                                         }          
840                                                                 }
841
842                                                                 // Clear this jump as it has been checked
843                                                                 fwdjump[j] = 0;
844                                                                 j = fwindex;
845                                                         }
846                                                 }
847                                         }
848 #endif
849
850                                         // Long constant in MOVEI # is word-swapped, so fix it here
851                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
852                                         flags = (MLONG | MMOVEI);
853                                 }
854                                 else
855                                         flags = MLONG;
856
857                                 if (!(eattr & DEFINED))
858                                 {
859 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
860                                         rmark(sno, loc, 0, flags, esym);
861                                 }
862                                 else if (tdb)
863                                 {
864 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
865                                         rmark(sno, loc, tdb, flags, NULL);
866                                 }
867 //else
868 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
869
870                                 *locp++ = (char)(eval >> 24);
871                                 *locp++ = (char)(eval >> 16);
872                                 *locp++ = (char)(eval >> 8);
873                                 *locp = (char)eval;
874                                 break;
875
876                         // Fixup a 3-bit "QUICK" reference in bits 9..1
877                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
878                         case FU_QUICK:
879                                 if (!(eattr & DEFINED))
880                                 {
881                                         error("External quick reference");
882                                         continue;
883                                 }
884
885                                 if (eval < 1 || eval > 8)
886                                         goto range;
887
888                                 *locp |= (eval & 7) << 1;
889                                 break;
890
891                         // Fix up 6502 funny branch
892                         case FU_6BRA:
893                                 eval -= (loc + 1);
894
895                                 if (eval + 0x80 >= 0x100)
896                                         goto range;
897
898                                 *locp = (char)eval;
899                                 break;
900
901                         default:
902                                 // Bad fixup type--this should *never* happen!
903                                 interror(4);
904                                 // NOTREACHED
905                         }
906                         continue;
907 range:
908                         error("expression out of range");
909                 }
910
911                 ch = ch->chnext;
912         }
913         while (ch != NULL);
914
915         return 0;
916 }
917