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
21 // Function prototypes
22 void MakeSection(int, WORD);
23 void SwitchSection(int);
25 // Section descriptors
26 SECT sect[NSECTS]; // All sections...
27 int cursect; // Current section number
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
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
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
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[] = {
58 // Offset to REAL fixup location
59 static char fusizoffs[] = {
72 // Initialize sections; setup initial ABS, TEXT, DATA and BSS sections
74 void InitSection(void)
78 // Cleanup all sections
79 for(i=0; i<NSECTS; i++)
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
89 // Switch to TEXT for starters
95 // Make a new (clean) section
97 void MakeSection(int sno, WORD attr)
99 SECT * p = §[sno];
102 p->scode = p->sfcode = NULL;
103 p->sfix = p->sffix = NULL;
108 // Switch to another section (copy section & chunk descriptors to global vars
111 void SwitchSection(int sno)
115 SECT * p = §[sno];
123 // Copy code chunk vars
124 if ((cp = scode) != NULL)
126 challoc = cp->challoc;
127 ch_size = cp->ch_size;
128 chptr = cp->chptr + ch_size;
131 challoc = ch_size = 0;
133 // Copy fixup chunk vars
134 if ((cp = sfix) != NULL)
136 fchalloc = cp->challoc;
137 fchsize = cp->ch_size;
138 fchptr.cp = cp->chptr + fchsize;
141 fchalloc = fchsize = 0;
146 // Save current section
148 void SaveSection(void)
150 SECT * p = §[cursect];
152 p->scattr = scattr; // Bailout section vars
155 if (scode != NULL) // Bailout code chunk
156 scode->ch_size = ch_size;
158 if (sfix != NULL) // Bailout fixup chunk
159 sfix->ch_size = fchsize;
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
167 int fixtest(int sno, LONG loc)
175 // Force update to sect[] variables
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
181 for(ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext)
183 fup.cp = (char *)ch->chptr;
184 fuend = fup.cp + ch->ch_size;
186 while (fup.cp < fuend)
189 xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK];
193 return (int)fusiztab[w & FUMASK];
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
214 // If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
216 int chcheck(LONG amt)
218 DEBUG { printf("chcheck(%u)\n", amt); }
219 // If in BSS section, no allocation required
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)
230 if (amt < CH_CODE_SIZE)
233 DEBUG { printf(" amt (adjusted)=%u\n", amt); }
234 SECT * p = §[cursect];
235 CHUNK * cp = malloc(sizeof(CHUNK) + amt);
237 // First chunk in section
243 // Add chunk to other chunks
248 scode->ch_size = ch_size; // Save old chunk's globals
251 // Setup chunk and global vars
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;
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))
267 // Arrange for a fixup on a location
269 int AddFixup(WORD attr, LONG loc, TOKEN * fexpr)
275 // Shamus: Expression lengths are voodoo ATM (variable "i"). Need to fix
277 #warning "!!! AddFixup() is filled with VOODOO !!!"
278 DEBUG printf("FIXUP@$%X: $%X\n", loc, attr);
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)
285 // Just a single symbol
286 // SCPCD : correct bit mask for attr (else other FU_xxx will match)
288 if ((attr & FUMASKRISC) == FU_JR)
291 // i = FIXUP_BASE_SIZE + (sizeof(LONG) * 2);
292 i = FIXUP_BASE_SIZE + sizeof(SYM *) + sizeof(LONG);
297 i = FIXUP_BASE_SIZE + sizeof(SYM *);
304 for(len=0; fexpr[len]!=ENDEXPR; len++)
306 if (fexpr[len] == CONST || fexpr[len] == SYMBOL)
310 len++; // Add 1 for ENDEXPR
311 // i = (len << 2) + 12;
312 i = FIXUP_BASE_SIZE + sizeof(WORD) + (len * sizeof(TOKEN));
315 // Maybe alloc another fixup chunk for this one to fit in
316 if ((fchalloc - fchsize) < i)
319 cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE);
321 // First fixup chunk in section
327 // Add to other chunks
332 sfix->ch_size = fchsize;
335 // Setup fixup chunk and its global vars
337 fchalloc = cp->challoc = CH_FIXUP_SIZE;
338 fchsize = cp->ch_size = 0;
339 fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK);
343 // Record fixup type, fixup location, and the file number and line number
344 // the fixup is located at.
347 *fchptr.wp++ = cfileno;
348 *fchptr.wp++ = (WORD)curlineno;
350 // Store postfix expression or pointer to a single symbol, or nothing for a
354 *fchptr.wp++ = (WORD)len;
357 *fchptr.lp++ = (LONG)*fexpr++;
361 // *fchptr.lp++ = (LONG)fexpr[1];
362 *fchptr.sy++ = symbolPtr[fexpr[1]];
365 // SCPCD : correct bit mask for attr (else other FU_xxx will match) NYAN !
366 if ((attr & FUMASKRISC) == FU_JR)
369 *fchptr.lp++ = orgaddr;
371 *fchptr.lp++ = 0x00000000;
380 // Resolve all fixups
382 int ResolveAllFixups(void)
387 // Make undefined symbols GLOBL
389 ForceUndefinedSymbolsGlobal();
391 DEBUG printf("Resolving TEXT sections...\n");
393 DEBUG printf("Resolving DATA sections...\n");
401 // Resolve fixups in a section
403 int ResolveFixups(int sno)
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
419 unsigned page_jump = 0;
420 unsigned address = 0;
424 SECT * sc = §[sno];
425 CHUNK * ch = sc->sffix;
430 // "Cache" first chunk
431 CHUNK * cch = sc->sfcode;
433 // Can't fixup a section with nothing in it
439 fup.cp = ch->chptr; // fup -> start of chunk
440 fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk
442 while (fup.wp < fuend)
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();
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
459 if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size))
461 for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext)
463 if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size))
469 // Fixup (loc) out of range
475 locp = cch->chptr + (loc - cch->chloc);
478 // Compute expression/symbol value and attribs
479 // Complex expression
484 if (evexpr(fup.tk, &eval, &eattr, &esym) != OK)
503 if ((eattr & (GLOBAL | DEFINED)) == GLOBAL)
507 tdb = (WORD)(eattr & TDB);
509 // If the expression is undefined and no external symbol is
510 // involved, then it's an error.
511 if (!(eattr & DEFINED) && (esym == NULL))
517 // It seems that this is completely unnecessary!
519 if (((w & FUMASKRISC) == FU_MOVEI) && esym)
521 //printf("DoFixups: Setting symbol attre to RISCSYM...\n");
522 esym->sattre |= RISCSYM;
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).
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
536 // PC-relative fixups must be DEFINED and either in the same
537 // section (whereupon the subtraction takes place) or ABS (with no
547 error("PC-relative expr across sections");
551 if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100))
552 warn("unoptimized short branch");
554 else if (obj_format == MWC)
562 switch ((int)(w & FUMASK))
564 // FU_BBRA fixes up a one-byte branch offset.
566 if (!(eattr & DEFINED))
568 error("external short branch");
574 if (eval + 0x80 >= 0x100)
579 error("illegal bra.s with zero offset");
583 *++locp = (char)eval;
585 // Fixup one-byte value at locp + 1.
589 // Fixup one-byte forward references
591 if (!(eattr & DEFINED))
593 error("external byte reference");
599 error("non-absolute byte reference");
603 if ((w & FU_PCREL) && eval + 0x80 >= 0x100)
608 if (eval + 0x100 >= 0x200)
611 else if (eval >= 0x100)
616 // Fixup WORD forward references;
617 // the word could be unaligned in the section buffer, so we have to
620 if ((w & FUMASKRISC) == FU_JR)// || ((w & 0x0F00) == FU_MJR))
625 reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F;
627 reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F;
630 if ((w & 0x0F00) == FU_MJR)
632 // Main code destination alignment checking here for
633 // forward declared labels
634 address = (oaddr) ? oaddr : loc;
636 if (((address >= 0xF03000) && (address < 0xF04000)
637 && (eval < 0xF03000)) || ((eval >= 0xF03000)
638 && (eval < 0xF04000) && (address < 0xF03000)))
640 warni("* \'jr\' at $%08X - cannot jump relative between "
641 "main memory and local gpu ram", address);
645 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
649 // This jump is to a page outside of the
650 // current 256 byte page
653 warni("* \'jr\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
658 // This jump is in the current 256 byte page
661 warni("* \'jr\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
668 if ((reg2 < -16) || (reg2 > 15))
670 error("relative jump out of range");
674 *locp = (char)(*locp | ((reg2 >> 3) & 0x03));
676 *locp = (char)(*locp | ((reg2 & 0x07) << 5));
680 if ((w & FUMASKRISC) == FU_NUM15)
682 if (eval < -16 || eval > 15)
684 error("constant out of range");
688 *locp = (char)(*locp | ((eval >> 3) & 0x03));
690 *locp = (char)(*locp | ((eval & 0x07) << 5));
694 if ((w & FUMASKRISC) == FU_NUM31)
696 if (eval < 0 || eval > 31)
698 error("constant out of range");
702 *locp = (char)(*locp | ((eval >> 3) & 0x03));
704 *locp = (char)(*locp | ((eval & 0x07) << 5));
708 if ((w & FUMASKRISC) == FU_NUM32)
710 if (eval < 1 || eval > 32)
712 error("constant out of range");
719 eval = (eval == 32) ? 0 : eval;
720 *locp = (char)(*locp | ((eval >> 3) & 0x03));
722 *locp = (char)(*locp | ((eval & 0x07) << 5));
726 if ((w & FUMASKRISC) == FU_REGONE)
728 if (eval < 0 || eval > 31)
730 error("register value out of range");
734 *locp = (char)(*locp | ((eval >> 3) & 0x03));
736 *locp = (char)(*locp | ((eval & 0x07) << 5));
740 if ((w & FUMASKRISC) == FU_REGTWO)
742 if (eval < 0 || eval > 31)
744 error("register value out of range");
749 *locp = (char)(*locp | (eval & 0x1F));
753 if (!(eattr & DEFINED))
760 rmark(sno, loc, 0, w, esym);
765 rmark(sno, loc, tdb, MWORD, NULL);
769 if (eval + 0x10000 >= 0x20000)
774 // Range-check BRA and DBRA
777 if (eval + 0x8000 >= 0x10000)
780 else if (eval >= 0x10000)
785 *locp++ = (char)(eval >> 8);
788 // Fixup LONG forward references;
789 // the long could be unaligned in the section buffer, so be careful
792 if ((w & FUMASKRISC) == FU_MOVEI)
799 for(j=0; j<fwindex; j++)
801 if (fwdjump[j] == address)
803 page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00);
810 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, insert a \'nop\' before the destination address", address);
816 write(err_fd, buf, (LONG)strlen(buf));
823 if (!(eval & 0x0000000F) || ((eval - 2) % 4))
826 sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, insert a \'nop\' before the destination address", address);
832 write(err_fd, buf, (LONG)strlen(buf));
838 // Clear this jump as it has been checked
846 // Long constant in MOVEI # is word-swapped, so fix it here
847 eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
848 flags = (MLONG | MMOVEI);
853 if (!(eattr & DEFINED))
855 //printf("Fixup (long): Symbol undefined. loc = $%X, long = $%X, flags = $%x\n", loc, eval, flags);
856 rmark(sno, loc, 0, flags, esym);
860 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
861 rmark(sno, loc, tdb, flags, NULL);
864 //printf("Fixup (long): TDB = $%X. loc =$%X, long = $%X, flags = $%x\n", tdb, loc, eval, flags);
866 *locp++ = (char)(eval >> 24);
867 *locp++ = (char)(eval >> 16);
868 *locp++ = (char)(eval >> 8);
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.
875 if (!(eattr & DEFINED))
877 error("External quick reference");
881 if (eval < 1 || eval > 8)
884 *locp |= (eval & 7) << 1;
887 // Fix up 6502 funny branch
891 if (eval + 0x80 >= 0x100)
898 interror(4); // Bad fixup type
903 error("expression out of range");