Fixed a nasty bug that dropped symbols that shouldn't have been.
[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 printf("DoFixups: found symbol (%s) [%08X]\n", sy->sname, sy->sattr);
510                         }
511
512                         tdb = (WORD)(eattr & TDB);
513
514                         // If the expression is undefined and no external symbol is
515                         // involved, then it's an error.
516                         if (!(eattr & DEFINED) && (esym == NULL))
517                         {
518                                 error(undef_error);
519                                 continue;
520                         }
521
522 // It seems that this is completely unnecessary!
523 #if 0
524                         if (((w & FUMASKRISC) == FU_MOVEI) && esym)
525 //{
526 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
527                                 esym->sattre |= RISCSYM;
528 //}
529 #endif
530
531                         // Do the fixup
532                         // 
533                         // If a PC-relative fixup is undefined, its value is *not*
534                         // subtracted from the location (that will happen in the linker
535                         // when the external reference is resolved).
536                         // 
537                         // MWC expects PC-relative things to have the LOC subtracted from
538                         // the value, if the value is external (that is, undefined at this
539                         // point).
540                         // 
541                         // PC-relative fixups must be DEFINED and either in the same
542                         // section (whereupon the subtraction takes place) or ABS (with no
543                         // subtract).
544                         if (w & FU_PCREL)
545                         {
546                                 if (eattr & DEFINED)
547                                 {
548                                         if (tdb == sno)
549                                                 eval -= (VALUE)loc;
550                                         else if (tdb)
551                                         {
552                                                 error("PC-relative expr across sections");
553                                                 continue;
554                                         }
555
556                                         if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
557                                                 warn("unoptimized short branch");
558                                 }
559                                 else if (obj_format == MWC)
560                                         eval -= (VALUE)loc;
561
562                                 tdb = 0;
563                                 eattr &= ~TDB;
564                         }
565
566                         // Do fixup classes
567                         switch ((int)(w & FUMASK))
568                         {
569                         // FU_BBRA fixes up a one-byte branch offset.
570                         case FU_BBRA:
571                                 if (!(eattr & DEFINED))
572                                 {
573                                         error("external short branch");
574                                         continue;
575                                 }
576
577                                 eval -= 2;
578
579                                 if (eval + 0x80 >= 0x100)
580                                         goto range;
581
582                                 if (eval == 0)
583                                 {
584                                         error("illegal bra.s with zero offset");
585                                         continue;
586                                 }
587
588                                 *++locp = (char)eval;
589                                 break;
590                         // Fixup one-byte value at locp + 1.
591                         case FU_WBYTE:
592                                 locp++;
593                                 // FALLTHROUGH
594                         // Fixup one-byte forward references
595                         case FU_BYTE:
596                                 if (!(eattr & DEFINED))
597                                 {
598                                         error("external byte reference");
599                                         continue;
600                                 }
601
602                                 if (tdb)
603                                 {
604                                         error("non-absolute byte reference");
605                                         continue;
606                                 }
607
608                                 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
609                                         goto range;
610
611                                 if (w & FU_SEXT)
612                                 {
613                                         if (eval + 0x100 >= 0x200)
614                                                 goto range;
615                                 }
616                                 else if (eval >= 0x100)
617                                         goto range;
618
619                                 *locp = (char)eval;
620                                 break;
621                         // Fixup WORD forward references; 
622                         // the word could be unaligned in the section buffer, so we have to
623                         // be careful.
624                         case FU_WORD:
625                                 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
626                                 {
627                                         oaddr = *fup.lp++;
628
629                                         if (oaddr)
630                                                 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
631                                         else
632                                                 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
633
634 #if 0
635                                         if ((w & 0x0F00) == FU_MJR)
636                                         {
637                                                 // Main code destination alignment checking here for
638                                                 // forward declared labels
639                                                 address = (oaddr) ? oaddr : loc;
640
641                                                 if (((address >= 0xF03000) && (address < 0xF04000)
642                                                         && (eval < 0xF03000)) || ((eval >= 0xF03000)
643                                                         && (eval < 0xF04000) && (address < 0xF03000)))
644                                                 {
645                                                         warni("* \'jr\' at $%08X - cannot jump relative between "
646                                                                 "main memory and local gpu ram", address);
647                                                 }
648                                                 else
649                                                 {
650                                                         page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
651
652                                                         if (page_jump)
653                                                         {
654                                                                 // This jump is to a page outside of the
655                                                                 // current 256 byte page
656                                                                 if (eval % 4)
657                                                                 {
658                                                                         warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
659                                                                 }
660                                                         }
661                                                         else
662                                                         {
663                                                                 // This jump is in the current 256 byte page
664                                                                 if ((eval - 2) % 4)
665                                                                 {
666                                                                         warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
667                                                                 }
668                                                         }
669                                                 }
670                                         }
671 #endif
672
673                                         if ((reg2 < -16) || (reg2 > 15))
674                                         {
675                                                 error("relative jump out of range");
676                                                 break;
677                                         }
678
679                                         *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
680                                         locp++;
681                                         *locp = (char)(*locp | ((reg2 & 0x07) << 5));
682                                         break;
683                                 }
684
685                                 if ((w & FUMASKRISC) == FU_NUM15)
686                                 {
687                                         if (eval < -16 || eval > 15)
688                                         {
689                                                 error("constant out of range");
690                                                 break;
691                                         }
692
693                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
694                                         locp++;
695                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
696                                         break;
697                                 }
698
699                                 if ((w & FUMASKRISC) == FU_NUM31)
700                                 {
701                                         if (eval < 0 || eval > 31)
702                                         {
703                                                 error("constant out of range");
704                                                 break;
705                                         }
706
707                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
708                                         locp++;
709                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
710                                         break;
711                                 }
712
713                                 if ((w & FUMASKRISC) == FU_NUM32)
714                                 {
715                                         if (eval < 1 || eval > 32)
716                                         {
717                                                 error("constant out of range");
718                                                 break;
719                                         }
720
721                                         if (w & FU_SUB32)
722                                                 eval = (32 - eval);
723
724                                         eval = (eval == 32) ? 0 : eval;
725                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
726                                         locp++;
727                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
728                                         break;
729                                 }
730
731                                 if ((w & FUMASKRISC) == FU_REGONE)
732                                 {
733                                         if (eval < 0 || eval > 31)
734                                         {
735                                                 error("register value out of range");
736                                                 break;
737                                         }
738
739                                         *locp = (char)(*locp | ((eval >> 3) & 0x03));
740                                         locp++;
741                                         *locp = (char)(*locp | ((eval & 0x07) << 5));
742                                         break;
743                                 }
744
745                                 if ((w & FUMASKRISC) == FU_REGTWO)
746                                 {
747                                         if (eval < 0 || eval > 31)
748                                         {
749                                                 error("register value out of range");
750                                                 break;
751                                         }
752
753                                         locp++;
754                                         *locp = (char)(*locp | (eval & 0x1F));
755                                         break;
756                                 }
757
758                                 if (!(eattr & DEFINED))
759                                 {
760                                         if (w & FU_PCREL)
761                                                 w = MPCREL | MWORD;
762                                         else
763                                                 w = MWORD;
764
765                                         rmark(sno, loc, 0, w, esym);
766                                 }
767                                 else
768                                 {
769                                         if (tdb)
770                                                 rmark(sno, loc, tdb, MWORD, NULL);
771
772                                         if (w & FU_SEXT)
773                                         {
774                                                 if (eval + 0x10000 >= 0x20000)
775                                                         goto range;
776                                         }
777                                         else
778                                         {
779                                                 // Range-check BRA and DBRA
780                                                 if (w & FU_ISBRA)
781                                                 {
782                                                         if (eval + 0x8000 >= 0x10000)
783                                                         goto range;
784                                                 }
785                                                 else if (eval >= 0x10000)
786                                                         goto range;
787                                         }
788                                 }
789
790                                 *locp++ = (char)(eval >> 8);
791                                 *locp = (char)eval;
792                                 break;
793                         // Fixup LONG forward references;
794                         // the long could be unaligned in the section buffer, so be careful
795                         // (again).
796                         case FU_LONG:
797                                 if ((w & FUMASKRISC) == FU_MOVEI)
798                                 {
799 #if 0
800                                         address = loc + 4;
801
802                                         if (eattr & DEFINED)
803                                         {
804                                                 for(j=0; j<fwindex; j++)
805                                                 {
806                                                         if (fwdjump[j] == address)
807                                                         {
808                                                                 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
809
810                                                                 if (page_jump)
811                                                                 {
812                                                                         if (eval % 4)
813                                                                         {
814                                                                                 err_setup();
815                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
816
817                                                                                 if (listing > 0)
818                                                                                         ship_ln(buf);
819
820                                                                                 if (err_flag)
821                                                                                         write(err_fd, buf, (LONG)strlen(buf));
822                                                                                 else
823                                                                                         printf("%s\n", buf);
824                                                                         }          
825                                                                 }
826                                                                 else
827                                                                 {
828                                                                         if (!(eval & 0x0000000F) || ((eval - 2) % 4))
829                                                                         {
830                                                                                 err_setup();
831                                                                                 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
832
833                                                                                 if (listing > 0)
834                                                                                         ship_ln(buf);
835
836                                                                                 if (err_flag)
837                                                                                         write(err_fd, buf, (LONG)strlen(buf));
838                                                                                 else
839                                                                                         printf("%s\n", buf);
840                                                                         }          
841                                                                 }
842
843                                                                 // Clear this jump as it has been checked
844                                                                 fwdjump[j] = 0;
845                                                                 j = fwindex;
846                                                         }
847                                                 }
848                                         }
849 #endif
850
851                                         // Long constant in MOVEI # is word-swapped, so fix it here
852                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
853                                         flags = (MLONG | MMOVEI);
854                                 }
855                                 else
856                                         flags = MLONG;
857
858                                 if (!(eattr & DEFINED))
859                                 {
860 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
861                                         rmark(sno, loc, 0, flags, esym);
862                                 }
863                                 else if (tdb)
864                                 {
865 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
866                                         rmark(sno, loc, tdb, flags, NULL);
867                                 }
868 //else
869 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
870
871                                 *locp++ = (char)(eval >> 24);
872                                 *locp++ = (char)(eval >> 16);
873                                 *locp++ = (char)(eval >> 8);
874                                 *locp = (char)eval;
875                                 break;
876
877                         // Fixup a 3-bit "QUICK" reference in bits 9..1
878                         // (range of 1..8) in a word.  Really bits 1..3 in a byte.
879                         case FU_QUICK:
880                                 if (!(eattr & DEFINED))
881                                 {
882                                         error("External quick reference");
883                                         continue;
884                                 }
885
886                                 if (eval < 1 || eval > 8)
887                                         goto range;
888
889                                 *locp |= (eval & 7) << 1;
890                                 break;
891
892                         // Fix up 6502 funny branch
893                         case FU_6BRA:
894                                 eval -= (loc + 1);
895
896                                 if (eval + 0x80 >= 0x100)
897                                         goto range;
898
899                                 *locp = (char)eval;
900                                 break;
901
902                         default:
903                                 // Bad fixup type--this should *never* happen!
904                                 interror(4);
905                                 // NOTREACHED
906                         }
907                         continue;
908 range:
909                         error("expression out of range");
910                 }
911
912                 ch = ch->chnext;
913         }
914         while (ch != NULL);
915
916         return 0;
917 }
918