X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=sect.c;h=3e127656916367fa1f7573336582f7a951f9501e;hp=3968dd57ed485331a8aee25001e95d05d8eb32db;hb=eace4e1b294ccec54a5c476619f616f5da0bf8a9;hpb=75cce0d9eb190f6094f66ae283b5981af25e5a57 diff --git a/sect.c b/sect.c index 3968dd5..3e12765 100644 --- a/sect.c +++ b/sect.c @@ -1,695 +1,830 @@ // -// RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System +// RMAC - Reboot's Macro Assembler for all Atari computers // SECT.C - Code Generation, Fixups and Section Management -// Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends +// Copyright (C) 199x Landon Dyer, 2011-2017 Reboot and Friends // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986 -// Source Utilised with the Kind Permission of Landon Dyer +// Source utilised with the kind permission of Landon Dyer // #include "sect.h" +#include "6502.h" +#include "direct.h" #include "error.h" +#include "expr.h" +#include "listing.h" #include "mach.h" -#include "token.h" #include "mark.h" -#include "expr.h" +#include "riscasm.h" #include "symbol.h" -#include "risca.h" -#include "listing.h" +#include "token.h" + + +// Minimum size of a fixup record +#define MIN_FIXUP_MEM (3 * sizeof(uint16_t) + 1 * sizeof(uint32_t)) + +// Function prototypes +void MakeSection(int, uint16_t); +void SwitchSection(int); // Section descriptors -SECT sect[NSECTS]; // All sections... -int cursect; // Current section number - -// These are copied from the section descriptor, the current code chunk descriptor and the current -// fixup chunk descriptor when a switch is made into a section. They are copied back to the -// descriptors when the section is left. -WORD scattr; // Section attributes -LONG sloc; // Current loc in section - -CHUNK *scode; // Current (last) code chunk -LONG challoc; // #bytes alloc'd to code chunk -LONG ch_size; // #bytes used in code chunk -char *chptr; // Deposit point in code chunk buffer - -CHUNK *sfix; // Current (last) fixup chunk -LONG fchalloc; // #bytes alloc'd to fixup chunk -LONG fchsize; // #bytes used in fixup chunk -PTR fchptr; // Deposit point in fixup chunk buffer - -unsigned fwdjump[MAXFWDJUMPS]; // forward jump check table -unsigned fwindex = 0; // forward jump index - -// Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is associated -// with a location. -static char fusiztab[] = { - 0, // FU_QUICK - 1, // FU_BYTE - 2, // FU_WORD - 2, // FU_WBYTE - 4, // FU_LONG - 1, // FU_BBRA - 0, // (unused) - 1, // FU_6BRA +SECT sect[NSECTS]; // All sections... +int cursect; // Current section number + +// These are copied from the section descriptor, the current code chunk +// descriptor and the current fixup chunk descriptor when a switch is made into +// a section. They are copied back to the descriptors when the section is left. +uint16_t scattr; // Section attributes +uint32_t sloc; // Current loc in section + +CHUNK * scode; // Current (last) code chunk +uint32_t challoc; // # bytes alloc'd to code chunk +uint32_t ch_size; // # bytes used in code chunk +uint8_t * chptr; // Deposit point in code chunk buffer +uint8_t * chptr_opcode; // Backup of chptr, updated before entering code generators + +CHUNK * sfix; // Current (last) fixup chunk +uint32_t fchalloc; // # bytes alloc'd to fixup chunk +uint32_t fchsize; // # bytes used in fixup chunk +PTR fchptr; // Deposit point in fixup chunk buffer + +// Return a size (SIZB, SIZW, SIZL) or 0, depending on what kind of fixup is +// associated with a location. +static uint8_t fusiztab[] = { + 0, // FU_QUICK + 1, // FU_BYTE + 2, // FU_WORD + 2, // FU_WBYTE + 4, // FU_LONG + 1, // FU_BBRA + 0, // (unused) + 1, // FU_6BRA }; // Offset to REAL fixup location -static char fusizoffs[] = { - 0, // FU_QUICK - 0, // FU_BYTE - 0, // FU_WORD - 1, // FU_WBYTE - 0, // FU_LONG - 1, // FU_BBRA - 0, // (unused) - 0, // FU_6BRA +static uint8_t fusizoffs[] = { + 0, // FU_QUICK + 0, // FU_BYTE + 0, // FU_WORD + 1, // FU_WBYTE + 0, // FU_LONG + 1, // FU_BBRA + 0, // (unused) + 0, // FU_6BRA }; + // -// --- Make a New (Clean) Section ------------------------------------------------------------------ +// Initialize sections; setup initial ABS, TEXT, DATA and BSS sections // - -void mksect(int sno, WORD attr) { - SECT *p; // Section pointer - - p = §[sno]; - p->scattr = attr; - p->sloc = 0; - p->scode = p->sfcode = NULL; - p->sfix = p->sffix = NULL; +void InitSection(void) +{ + // Cleanup all sections + for(int i=0; iscattr; // Copy section vars - sloc = p->sloc; - scode = p->scode; - sfix = p->sfix; - - if((cp = scode) != NULL) { // Copy code chunk vars - challoc = cp->challoc; - ch_size = cp->ch_size; - chptr = cp->chptr + ch_size; - } else challoc = ch_size = 0; - - if((cp = sfix) != NULL) { // Copy fixup chunk vars - fchalloc = cp->challoc; - fchsize = cp->ch_size; - fchptr.cp = cp->chptr + fchsize; - } else fchalloc = fchsize = 0; +void MakeSection(int sno, uint16_t attr) +{ + SECT * p = §[sno]; + p->scattr = attr; + p->sloc = 0; + p->scode = p->sfcode = NULL; + p->sfix = p->sffix = NULL; } + // -// --- Save Current Section ------------------------------------------------------------------------ +// Switch to another section (copy section & chunk descriptors to global vars +// for fast access) // - -void savsect(void) { - SECT *p; - - p = §[cursect]; - - p->scattr = scattr; // Bailout section vars - p->sloc = sloc; - - if(scode != NULL) // Bailout code chunk - scode->ch_size = ch_size; - - if(sfix != NULL) // Bailout fixup chunk - sfix->ch_size = fchsize; +void SwitchSection(int sno) +{ + CHUNK * cp; + cursect = sno; + SECT * p = §[sno]; + + m6502 = (sno == M6502); // Set 6502-mode flag + + // Copy section vars + scattr = p->scattr; + sloc = p->sloc; + scode = p->scode; + sfix = p->sfix; + + // Copy code chunk vars + if ((cp = scode) != NULL) + { + challoc = cp->challoc; + ch_size = cp->ch_size; + chptr = cp->chptr + ch_size; + + // For 6502 mode, add the last org'd address + if (m6502) + chptr = cp->chptr + orgaddr; + } + else + challoc = ch_size = 0; + + // Copy fixup chunk vars + if ((cp = sfix) != NULL) + { + fchalloc = cp->challoc; + fchsize = cp->ch_size; + fchptr.cp = cp->chptr + fchsize; + } + else + fchalloc = fchsize = 0; } + // -// --- Initialize Sections; Setup initial ABS, TEXT, DATA and BSS sections ------------------------- +// Save current section // +void SaveSection(void) +{ + SECT * p = §[cursect]; -void init_sect(void) { - int i; // Iterator - - // Cleanup all sections - for(i = 0; i < NSECTS; ++i) - mksect(i, 0); + p->scattr = scattr; // Bailout section vars + p->sloc = sloc; - // Construct default sections, make TEXT the current section - mksect(ABS, SUSED|SABS|SBSS); // ABS - mksect(TEXT, SUSED|TEXT ); // TEXT - mksect(DATA, SUSED|DATA ); // DATA - mksect(BSS, SUSED|BSS |SBSS); // BSS -// mksect(M6502, SUSED|TEXT ); // 6502 code section + if (scode != NULL) // Bailout code chunk + scode->ch_size = ch_size; - switchsect(TEXT); // Switch to TEXT for starters + if (sfix != NULL) // Bailout fixup chunk + sfix->ch_size = fchsize; } + // -// ------------------------------------------------------------------------------------------------- -// Test to see if a location has a fixup sic'd on it. This is used by the listing -// generator to print 'xx's instead of '00's for forward references -// ------------------------------------------------------------------------------------------------- +// Test to see if a location has a fixup sic'd on it. This is used by the +// listing generator to print 'xx's instead of '00's for forward references // - -int fixtest(int sno, LONG loc) { - CHUNK *ch; - PTR fup; - char *fuend; - WORD w; - LONG xloc; - - stopmark(); // Force update to sect[] variables - - // Hairy, ugly linear search for a mark on our location; - // the speed doesn't matter, since this is only done when generating a listing, which is SLOW. - for(ch = sect[sno].sffix; ch != NULL; ch = ch->chnext) { - fup.cp = (char *)ch->chptr; - fuend = fup.cp + ch->ch_size; - - while(fup.cp < fuend) { - w = *fup.wp++; - xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK]; - fup.wp += 2; - - if(xloc == loc) - return((int)fusiztab[w & FUMASK]); - - if(w & FU_EXPR) { - w = *fup.wp++; - fup.lp += w; - } else ++fup.lp; - } - } - - return(0); +int fixtest(int sno, uint32_t loc) +{ + PTR fup; + + // Force update to sect[] variables + StopMark(); + + // Hairy, ugly linear search for a mark on our location; the speed doesn't + // matter, since this is only done when generating a listing, which is + // SLOW. + for(CHUNK * ch=sect[sno].sffix; ch!=NULL; ch=ch->chnext) + { + fup.cp = (uint8_t *)ch->chptr; + uint8_t * fuend = fup.cp + ch->ch_size; + + while (fup.cp < fuend) + { + uint16_t w = *fup.wp++; + uint32_t xloc = *fup.lp++ + (int)fusizoffs[w & FUMASK]; + fup.wp += 2; + + if (xloc == loc) + return (int)fusiztab[w & FUMASK]; + + if (w & FU_EXPR) + { + w = *fup.wp++; + fup.lp += w; + } + else + fup.lp++; + } + } + + return 0; } -// -// ------------------------------------------------------------------------------------------------- -// Check that there are at least `amt' bytes left in the current chunk. If there are not, -// allocate another chunk of at least `amt' bytes (and probably more). -// -// If `amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise. -// ------------------------------------------------------------------------------------------------- -// -int chcheck(LONG amt) { - CHUNK *cp; - SECT *p; - - if(scattr & SBSS) return(0); // If in BSS section, forget it - - if(!amt) amt = CH_THRESHOLD; - - if((int)(challoc - ch_size) >= (int)amt) - return(0); - - if(amt < CH_CODE_SIZE) amt = CH_CODE_SIZE; - p = §[cursect]; - cp = (CHUNK *)amem((long)(sizeof(CHUNK) + amt)); - if(scode == NULL) { // First chunk in section - cp->chprev = NULL; - p->sfcode = cp; - } else { // Add chunk to other chunks - cp->chprev = scode; - scode->chnext = cp; - scode->ch_size = ch_size; // Save old chunk's globals - } - - // Setup chunk and global vars - cp->chloc = sloc; - cp->chnext = NULL; - challoc = cp->challoc = amt; - ch_size = cp->ch_size = 0; - chptr = cp->chptr = ((char *)cp) + sizeof(CHUNK); - scode = p->scode = cp; - - return(0); +// +// Check that there are at least 'amt' bytes left in the current chunk. If +// there are not, allocate another chunk of at least 'amt' bytes (and probably +// more). +// +// If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise. +// +int chcheck(uint32_t amt) +{ + DEBUG { printf("chcheck(%u)\n", amt); } + // If in BSS section, no allocation required + if (scattr & SBSS) + return 0; + + if (!amt) + amt = CH_THRESHOLD; + + DEBUG { printf(" challoc=%i, ch_size=%i, diff=%i\n", challoc, ch_size, challoc-ch_size); } + if ((int)(challoc - ch_size) >= (int)amt) + return 0; + + if (amt < CH_CODE_SIZE) + amt = CH_CODE_SIZE; + + DEBUG { printf(" amt (adjusted)=%u\n", amt); } + SECT * p = §[cursect]; + CHUNK * cp = malloc(sizeof(CHUNK) + amt); + + // First chunk in section + if (scode == NULL) + { + cp->chprev = NULL; + p->sfcode = cp; + } + // Add chunk to other chunks + else + { + cp->chprev = scode; + scode->chnext = cp; + scode->ch_size = ch_size; // Save old chunk's globals + } + + // Setup chunk and global vars + cp->chloc = sloc; + cp->chnext = NULL; + challoc = cp->challoc = amt; + ch_size = cp->ch_size = 0; + chptr = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK); + scode = p->scode = cp; + + return 0; } + // -// --- Arrange for a fixup on a location ----------------------------------------------------------- +// A fixup record is at least 4 pieces of data long, with some optional data at +// the end. Is of the form: // - -int fixup(WORD attr, LONG loc, TOKEN *fexpr) { - LONG i; - LONG len = 0; - CHUNK *cp; - SECT *p; - - // Compute length of expression (could be faster); determine if it's the single-symbol case; - // no expression if it's just a mark. This code assumes 16 bit WORDs and 32 bit LONGs - if(*fexpr == SYMBOL && fexpr[2] == ENDEXPR) - //if((attr & 0x0F00) == FU_JR) { - if((attr & 0x0200) == FU_JR) { - i = 18; // Just a single symbol - } else { - i = 14; - } - else { - attr |= FU_EXPR; - for(len = 0; fexpr[len] != ENDEXPR; ++len) - if(fexpr[len] == CONST || fexpr[len] == SYMBOL) - ++len; - ++len; // Add 1 for ENDEXPR - i = (len << 2) + 12; - } - - // Maybe alloc another fixup chunk for this one to fit in - if((fchalloc - fchsize) < i) { - p = §[cursect]; - cp = (CHUNK *)amem((long)(sizeof(CHUNK) + CH_FIXUP_SIZE)); - if(sfix == NULL) { // First fixup chunk in section - cp->chprev = NULL; - p->sffix = cp; - } else { // Add to other chunks - cp->chprev = sfix; - sfix->chnext = cp; - sfix->ch_size = fchsize; - } - - // Setup fixup chunk and its global vars - cp->chnext = NULL; - fchalloc = cp->challoc = CH_FIXUP_SIZE; - fchsize = cp->ch_size = 0; - fchptr.cp = cp->chptr = ((char *)cp) + sizeof(CHUNK); - sfix = p->sfix = cp; - } - - // Record fixup type, fixup location, and the file number and line number the fixup is - // located at. - *fchptr.wp++ = attr; - *fchptr.lp++ = loc; - *fchptr.wp++ = cfileno; - *fchptr.wp++ = (WORD)curlineno; - // Store postfix expression or pointer to a single symbol, or nothing for a mark. - if(attr & FU_EXPR) { - *fchptr.wp++ = (WORD)len; - while(len--) - *fchptr.lp++ = (LONG)*fexpr++; - } else { - *fchptr.lp++ = (LONG)fexpr[1]; - } - - //if((attr & 0x0F00) == FU_JR) { - if((attr & 0x0200) == FU_JR) { - if(orgactive) *fchptr.lp++ = orgaddr; - else *fchptr.lp++ = 0x00000000; - } - - fchsize += i; - - return(0); +// SYMBOL EXPRESSION +// ------ ---------- +// FU_EXPR.W FU_EXPR.W fixup type +// loc.L loc.L location in section +// fileno.W fileno.W file number fixup occurred in +// lineno.W lineno.W line number fixup occurred in +// symbol.* size.W &symbol (32 or 64 bits) / size of expression +// token.L size (zero or more) TOKENS (32-bits each) +// ENDEXPR.L End of expression (with size > zero) +// JR.L Possible ORG address of RISC JR instruction +// +// Arrange for a fixup on a location +// +int AddFixup(uint16_t attr, uint32_t loc, TOKEN * fexpr) +{ + uint32_t i = MIN_FIXUP_MEM; + uint16_t len = 0; + + DEBUG printf("FIXUP@$%X: $%X\n", loc, attr); + + // Compute length of expression (could be faster); determine if it's the + // single-symbol case; no expression if it's just a mark. (? is this true?) + if ((*fexpr == SYMBOL) && (fexpr[2] == ENDEXPR)) + { + // Just a single symbol, possibly followed by a DWORD + i += sizeof(SYM *); + + // SCPCD: Correct bit mask for attr (else other FU_xxx will match) + // NYAN ! + if ((attr & FUMASKRISC) == FU_JR) + i += sizeof(uint32_t); + } + else + { + attr |= FU_EXPR; + + // Count the # of tokens in the expression + for(len=0; fexpr[len]!=ENDEXPR; len++) + { + // Add one to len for 2X tokens, two for 3X tokens + if (fexpr[len] == SYMBOL) + len++; + else if (fexpr[len] == CONST) + len += 2; + } + + // Add 1 for ENDEXPR + len++; + i += sizeof(uint16_t) + (len * sizeof(TOKEN)); + } + + // Alloc another fixup chunk for this one to fit in if necessary + if ((fchalloc - fchsize) < i) + { + SECT * p = §[cursect]; + CHUNK * cp = (CHUNK *)malloc(sizeof(CHUNK) + CH_FIXUP_SIZE); + + // First fixup chunk in section + if (sfix == NULL) + { + cp->chprev = NULL; + p->sffix = cp; + } + // Add to other chunks + else + { + cp->chprev = sfix; + sfix->chnext = cp; + sfix->ch_size = fchsize; + } + + // Setup fixup chunk and its global vars + cp->chnext = NULL; + fchalloc = cp->challoc = CH_FIXUP_SIZE; + fchsize = cp->ch_size = 0; + fchptr.cp = cp->chptr = ((uint8_t *)cp) + sizeof(CHUNK); + sfix = p->sfix = cp; + } + + // Record fixup type, fixup location, and the file number and line number + // the fixup is located at. + *fchptr.wp++ = attr; + *fchptr.lp++ = loc; + *fchptr.wp++ = cfileno; + *fchptr.wp++ = curlineno; + + // Store postfix expression or pointer to a single symbol, or nothing for a + // mark (a zero word is stored in this case--[? is it?]). + if (attr & FU_EXPR) + { + *fchptr.wp++ = len; + + while (len--) + *fchptr.lp++ = *fexpr++; + } + else + { + *fchptr.sy++ = symbolPtr[fexpr[1]]; + + // SCPCD: Correct bit mask for attr (else other FU_xxx will match) + // NYAN ! + if ((attr & FUMASKRISC) == FU_JR) + { + if (orgactive) + *fchptr.lp++ = orgaddr; + else + *fchptr.lp++ = 0x00000000; + } + } + + fchsize += i; + return 0; } + // -// --- Resolve all Fixups -------------------------------------------------------------------------- +// Resolve fixups in a section // - -int fixups(void) { - unsigned i; // Iterator - char buf[EBUFSIZ]; - - if(glob_flag) // Make undefined symbols GLOBL - syg_fix(); - resfix(TEXT); - resfix(DATA); - - // We need to do a final check of forward 'jump' destination addresses that are external - for(i = 0; i < MAXFWDJUMPS; i++) { - if(fwdjump[i]) { - err_setup(); - sprintf(buf, "* \'jump\' at $%08X - destination address is external to this source file and " - "cannot have its aligment validated", fwdjump[i]); - if(listing > 0) ship_ln(buf); - if(err_flag) write(err_fd, buf, (LONG)strlen(buf)); - else printf("%s\n", buf); - } - } - - return(0); +int ResolveFixups(int sno) +{ + PTR fup; // Current fixup + uint64_t eval; // Expression value + SYM * sy; // (Temp) pointer to a symbol + uint16_t i; // (Temp) word + int reg2; + uint16_t flags; + + SECT * sc = §[sno]; + CHUNK * ch = sc->sffix; + + if (ch == NULL) + return 0; + + // "Cache" first chunk + CHUNK * cch = sc->sfcode; + + // Can't fixup a section with nothing in it + if (cch == NULL) + return 0; + + // Wire the 6502 segment's size to its allocated size (64K) + if (sno == M6502) + cch->ch_size = cch->challoc; + + do + { + fup.cp = ch->chptr; // fup -> start of chunk + uint16_t * fuend = (uint16_t *)(fup.cp + ch->ch_size); // fuend -> end of chunk + + while (fup.wp < fuend) + { + uint16_t w = *fup.wp++; // Fixup word (type+modes+flags) + uint32_t loc = *fup.lp++; // Location to fixup + cfileno = *fup.wp++; + curlineno = *fup.wp++; + DEBUG { printf("ResolveFixups: cfileno=%u\n", cfileno); } + + // This is based on global vars cfileno, curfname :-P + // This approach is kinda meh as well. I think we can do better + // than this. + SetFilenameForErrorReporting(); + + SYM * esym = NULL; // External symbol involved in expr + + // Search for chunk containing location to fix up; compute a + // pointer to the location (in the chunk). Often we will find the + // Fixup is in the "cached" chunk, so the linear-search is seldom + // executed. + if (loc < cch->chloc || loc >= (cch->chloc + cch->ch_size)) + { + for(cch=sc->sfcode; cch!=NULL; cch=cch->chnext) + { + if (loc >= cch->chloc && loc < (cch->chloc + cch->ch_size)) + break; + } + + if (cch == NULL) + { + // Fixup (loc) out of range + interror(7); + // NOTREACHED + } + } + + // Location to fix (in cached chunk) + uint8_t * locp = cch->chptr + (loc - cch->chloc); + uint16_t eattr = 0; // Expression attrib + + // Compute expression/symbol value and attribs + + // Complex expression + if (w & FU_EXPR) + { + i = *fup.wp++; + + if (evexpr(fup.tk, &eval, &eattr, &esym) != OK) + { + fup.lp += i; + continue; + } + + fup.lp += i; + } + // Simple symbol + else + { + sy = *fup.sy++; + eattr = sy->sattr; + + if (eattr & DEFINED) + eval = sy->svalue; + else + eval = 0; + + // If the symbol is not defined, but global, set esym to sy + if ((eattr & (GLOBAL | DEFINED)) == GLOBAL) + esym = sy; + } + + uint16_t tdb = eattr & TDB; + + // If the expression is undefined and no external symbol is + // involved, then that's an error. + if (!(eattr & DEFINED) && (esym == NULL)) + { + error(undef_error); + continue; + } + + // Do the fixup + // + // If a PC-relative fixup is undefined, its value is *not* + // subtracted from the location (that will happen in the linker + // when the external reference is resolved). + // + // MWC expects PC-relative things to have the LOC subtracted from + // the value, if the value is external (that is, undefined at this + // point). + // + // PC-relative fixups must be DEFINED and either in the same + // section (whereupon the subtraction takes place) or ABS (with no + // subtract). + if (w & FU_PCREL) + { + if (eattr & DEFINED) + { + if (tdb == sno) + eval -= (uint32_t)loc; + else if (tdb) + { + error("PC-relative expr across sections"); + continue; + } + + if (sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100)) + warn("unoptimized short branch"); + } + else if (obj_format == MWC) + eval -= (uint32_t)loc; + + tdb = 0; + eattr &= ~TDB; + } + + // Do fixup classes + switch (w & FUMASK) + { + // FU_BBRA fixes up a one-byte branch offset. + case FU_BBRA: + if (!(eattr & DEFINED)) + { + error("external short branch"); + continue; + } + + eval -= 2; + + if (eval + 0x80 >= 0x100) + goto rangeErr; + + if (eval == 0) + { + error("illegal bra.s with zero offset"); + continue; + } + + *++locp = (uint8_t)eval; + break; + // Fixup one-byte value at locp + 1. + case FU_WBYTE: + locp++; + // FALLTHROUGH + // Fixup one-byte forward references + case FU_BYTE: + if (!(eattr & DEFINED)) + { + error("external byte reference"); + continue; + } + + if (tdb) + { + error("non-absolute byte reference"); + continue; + } + + if ((w & FU_PCREL) && eval + 0x80 >= 0x100) + goto rangeErr; + + if (w & FU_SEXT) + { + if (eval + 0x100 >= 0x200) + goto rangeErr; + } + else if (eval >= 0x100) + goto rangeErr; + + *locp = (uint8_t)eval; + break; + // Fixup high/low byte off word for 6502 + case FU_BYTEH: + if (!(eattr & DEFINED)) + { + error("external byte reference"); + continue; + } + + *locp = (uint8_t)((eval >> 8) & 0xFF); + break; + case FU_BYTEL: + if (!(eattr & DEFINED)) + { + error("external byte reference"); + continue; + } + + *locp = (uint8_t)(eval & 0xFF); + break; + // Fixup WORD forward references; + // the word could be unaligned in the section buffer, so we have to + // be careful. + case FU_WORD: + if ((w & FUMASKRISC) == FU_JR) + { + uint32_t orgaddr = *fup.lp++; + + if (orgaddr) + reg2 = (signed)((eval - (orgaddr + 2)) / 2); + else + reg2 = (signed)((eval - (loc + 2)) / 2); + + if ((reg2 < -16) || (reg2 > 15)) + { + error("relative jump out of range"); + break; + } + + *locp = (uint8_t)(*locp | ((reg2 >> 3) & 0x03)); + locp++; + *locp = (uint8_t)(*locp | ((reg2 & 0x07) << 5)); + break; + } + + if ((w & FUMASKRISC) == FU_NUM15) + { + if (eval < -16 || eval > 15) + { + error("constant out of range"); + break; + } + + *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03)); + locp++; + *locp = (uint8_t)(*locp | ((eval & 0x07) << 5)); + break; + } + + if ((w & FUMASKRISC) == FU_NUM31) + { + if (eval < 0 || eval > 31) + { + error("constant out of range"); + break; + } + + *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03)); + locp++; + *locp = (uint8_t)(*locp | ((eval & 0x07) << 5)); + break; + } + + if ((w & FUMASKRISC) == FU_NUM32) + { + if (eval < 1 || eval > 32) + { + error("constant out of range"); + break; + } + + if (w & FU_SUB32) + eval = (32 - eval); + + eval = (eval == 32) ? 0 : eval; + *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03)); + locp++; + *locp = (uint8_t)(*locp | ((eval & 0x07) << 5)); + break; + } + + if ((w & FUMASKRISC) == FU_REGONE) + { + if (eval < 0 || eval > 31) + { + error("register value out of range"); + break; + } + + *locp = (uint8_t)(*locp | ((eval >> 3) & 0x03)); + locp++; + *locp = (uint8_t)(*locp | ((eval & 0x07) << 5)); + break; + } + + if ((w & FUMASKRISC) == FU_REGTWO) + { + if (eval < 0 || eval > 31) + { + error("register value out of range"); + break; + } + + locp++; + *locp = (uint8_t)(*locp | (eval & 0x1F)); + break; + } + + if (!(eattr & DEFINED)) + { + flags = MWORD; + + if (w & FU_PCREL) + flags |= MPCREL; + + MarkRelocatable(sno, loc, 0, flags, esym); + } + else + { + if (tdb) + MarkRelocatable(sno, loc, tdb, MWORD, NULL); + + if (w & FU_SEXT) + { + if (eval + 0x10000 >= 0x20000) + goto rangeErr; + } + else + { + // Range-check BRA and DBRA + if (w & FU_ISBRA) + { + if (eval + 0x8000 >= 0x10000) + goto rangeErr; + } + else if (eval >= 0x10000) + goto rangeErr; + } + } + + // 6502 words are little endian, so handle that here + if (sno == M6502) + SETLE16(locp, 0, eval) + else + SETBE16(locp, 0, eval) + + break; + // Fixup LONG forward references; + // the long could be unaligned in the section buffer, so be careful + // (again). + case FU_LONG: + flags = MLONG; + + if ((w & FUMASKRISC) == FU_MOVEI) + { + // Long constant in MOVEI # is word-swapped, so fix it here + eval = WORDSWAP32(eval); + flags |= MMOVEI; + } + + // If the symbol is undefined, make sure to pass the symbol in + // to the MarkRelocatable() function. + if (!(eattr & DEFINED)) + MarkRelocatable(sno, loc, 0, flags, esym); + else if (tdb) + MarkRelocatable(sno, loc, tdb, flags, NULL); + + SETBE32(locp, 0, eval); + break; + + // Fixup a 3-bit "QUICK" reference in bits 9..1 + // (range of 1..8) in a word. Really bits 1..3 in a byte. + case FU_QUICK: + if (!(eattr & DEFINED)) + { + error("External quick reference"); + continue; + } + + if (eval < 1 || eval > 8) + goto rangeErr; + + *locp |= (eval & 7) << 1; + break; + + // Fix up 6502 funny branch + case FU_6BRA: + eval -= (loc + 1); + + if (eval + 0x80 >= 0x100) + goto rangeErr; + + *locp = (uint8_t)eval; + break; + + default: + // Bad fixup type--this should *never* happen! + interror(4); + // NOTREACHED + } + continue; +rangeErr: + error("expression out of range"); + } + + ch = ch->chnext; + } + while (ch != NULL); + + return 0; } // -// --- Resolve Fixups in a Section ----------------------------------------------------------------- +// Resolve all fixups // - -int resfix(int sno) { - SECT *sc; // Section - CHUNK *ch; - PTR fup; // Current fixup - WORD *fuend; // End of last fixup (in this chunk) - CHUNK *cch; // Cached chunk for target - WORD w; // Fixup word (type+modes+flags) - char *locp; // Location to fix (in cached chunk) - LONG loc; // Location to fixup - VALUE eval; // Expression value - WORD eattr; // Expression attrib - SYM *esym; // External symbol involved in expr - SYM *sy; // (Temp) pointer to a symbol - WORD i; // (Temp) word - WORD tdb; // eattr & TDB - LONG oaddr; - int reg2; - WORD flags; - unsigned page_jump = 0; - unsigned address = 0; - unsigned j; // iterator - char buf[EBUFSIZ]; - - sc = §[sno]; - ch = sc->sffix; - - if(ch == NULL) - return(0); - - cch = sc->sfcode; // "cache" first chunk - if(cch == NULL) // Can't fixup a sect with nothing in it - return(0); - - do { - fup.cp = ch->chptr; // fup -> start of chunk - fuend = (WORD *)(fup.cp + ch->ch_size); // fuend -> end of chunk - while(fup.wp < fuend) { - w = *fup.wp++; - loc = *fup.lp++; - cfileno = *fup.wp++; - curlineno = (int)*fup.wp++; - - esym = NULL; - // Search for chunk containing location to fix up; compute a pointer to the location - // (in the chunk). Often we will find the fixup is in the "cached" chunk, so the - // linear-search is seldom executed. - if(loc < cch->chloc || loc >= (cch->chloc + cch->ch_size)) { - for(cch = sc->sfcode; cch != NULL; cch = cch->chnext) - if(loc >= cch->chloc && loc < (cch->chloc + cch->ch_size)) - break; - if(cch == NULL) { - interror(7); // Fixup (loc) out of range - // NOTREACHED - } - } - locp = cch->chptr + (loc - cch->chloc); - - eattr = 0; - - // Compute expression/symbol value and attribs - if(w & FU_EXPR) { // Complex expression - i = *fup.wp++; - if(evexpr(fup.tk, &eval, &eattr, &esym) != OK) { - fup.lp += i; - continue; - } - fup.lp += i; - } else { // Simple symbol - sy = *fup.sy++; - eattr = sy->sattr; - if(eattr & DEFINED) - eval = sy->svalue; - else eval = 0; - - if((eattr & (GLOBAL|DEFINED)) == GLOBAL) - esym = sy; - } - tdb = (WORD)(eattr & TDB); - // If the expression is undefined and no external symbol is involved, then it's an error. - if(!(eattr & DEFINED) && esym == NULL) { - error(undef_error); - continue; - } - - - if(((w & 0x0F00) == FU_MOVEI) && esym) - esym->sattre |= RISCSYM; - - // Do the fixup - // - // If a PC-relative fixup is undefined, its value is *not* subtracted from the location - // (that will happen in the linker when the external reference is resolved). - // - // MWC expects PC-relative things to have the LOC subtracted from the value, if the - // value is external (that is, undefined at this point). - // - // PC-relative fixups must be DEFINED and either in the same section (whereupon the - // subtraction takes place) or ABS (with no subtract). - if(w & FU_PCREL) { - if(eattr & DEFINED) { - if(tdb == sno) eval -= (VALUE)loc; - else if(tdb) { - error("PC-relative expr across sections"); - continue; - } - - if(sbra_flag && (w & FU_LBRA) && (eval + 0x80 < 0x100)) - warn("unoptimized short branch"); - } else - if(obj_format == MWC) eval -= (VALUE)loc; - - tdb = 0; - eattr &= ~TDB; - } - - // Do fixup classes - switch((int)(w & FUMASK)) { - // FU_BBRA fixes up a one-byte branch offset. - case FU_BBRA: - if(!(eattr & DEFINED)) { - error("external short branch"); - continue; - } - eval -= 2; - if(eval + 0x80 >= 0x100) - goto range; - if(eval == 0) { - error("illegal bra.s with zero offset"); - continue; - } - *++locp = (char)eval; - break; - // Fixup one-byte value at locp + 1. - case FU_WBYTE: - ++locp; - // FALLTHROUGH - // Fixup one-byte forward references - case FU_BYTE: - if(!(eattr & DEFINED)) { - error("external byte reference"); - continue; - } - if(tdb) { - error("non-absolute byte reference"); - continue; - } - if((w & FU_PCREL) && eval + 0x80 >= 0x100) goto range; - if(w & FU_SEXT) { - if(eval + 0x100 >= 0x200) goto range; - } else - if(eval >= 0x100) goto range; - - *locp = (char)eval; - break; - // Fixup WORD forward references; - // the word could be unaligned in the section buffer, so we have to be careful. - case FU_WORD: - if(((w & 0x0F00) == FU_JR) || ((w & 0x0F00) == FU_MJR)) { - oaddr = *fup.lp++; - if(oaddr) { - reg2 = (signed)((eval - (oaddr + 2)) / 2);// & 0x1F; - } else { - reg2 = (signed)((eval - (loc + 2)) / 2);// & 0x1F; - } - if((w & 0x0F00) == FU_MJR) { - // Main code destination alignment checking here for forward declared labels - address = (oaddr) ? oaddr : loc; - if(((address >= 0xF03000) && (address < 0xF04000) && (eval < 0xF03000)) || - ((eval >= 0xF03000) && (eval < 0xF04000) && (address < 0xF03000)) ) { - warni("* \'jr\' at $%08X - cannot jump relative between " - "main memory and local gpu ram", address); - } else { - page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00); - if(page_jump) { - // This jump is to a page outside of the current 256 byte page - if(eval % 4) { - warni("* \'jr\' at $%08X - destination address not aligned for long page jump, " - "insert a \'nop\' before the destination address", address); - } - } else { - // This jump is in the current 256 byte page - if((eval - 2) % 4) { - warni("* \'jr\' at $%08X - destination address not aligned for short page jump, " - "insert a \'nop\' before the destination address", address); - } - } - } - } - if((reg2 < -16) || (reg2 > 15)) { - error("relative jump out of range"); - break; - } - *locp = (char)(*locp | ((reg2 >> 3) & 0x03)); - locp++; - *locp = (char)(*locp | ((reg2 & 0x07) << 5)); - break; - } - if((w & 0x0F00) == FU_NUM15) { - if(eval < -16 || eval > 15) { - error("constant out of range"); - break; - } - *locp = (char)(*locp | ((eval >> 3) & 0x03)); - locp++; - *locp = (char)(*locp | ((eval & 0x07) << 5)); - break; - } - if((w & 0x0F00) == FU_NUM31) { - if(eval < 0 || eval > 31) { - error("constant out of range"); - break; - } - *locp = (char)(*locp | ((eval >> 3) & 0x03)); - locp++; - *locp = (char)(*locp | ((eval & 0x07) << 5)); - break; - } - if((w & 0x0F00) == FU_NUM32) { - if(eval < 1 || eval > 32) { - error("constant out of range"); - break; - } - if(w & FU_SUB32) - eval = (32 - eval); - eval = (eval == 32) ? 0 : eval; - *locp = (char)(*locp | ((eval >> 3) & 0x03)); - locp++; - *locp = (char)(*locp | ((eval & 0x07) << 5)); - break; - } - if((w & 0x0F00) == FU_REGONE) { - if(eval < 0 || eval > 31) { - error("register value out of range"); - break; - } - *locp = (char)(*locp | ((eval >> 3) & 0x03)); - locp++; - *locp = (char)(*locp | ((eval & 0x07) << 5)); - break; - } - if((w & 0x0F00) == FU_REGTWO) { - if(eval < 0 || eval > 31) { - error("register value out of range"); - break; - } - locp++; - *locp = (char)(*locp | (eval & 0x1F)); - break; - } - - if(!(eattr & DEFINED)) { - if(w & FU_PCREL) - w = MPCREL | MWORD; - else w = MWORD; - rmark(sno, loc, 0, w, esym); - } else { - if(tdb) - rmark(sno, loc, tdb, MWORD, NULL); - if(w & FU_SEXT) { - if(eval + 0x10000 >= 0x20000) - goto range; - } else - if(w & FU_ISBRA) { // Range-check BRA and DBRA - if(eval + 0x8000 >= 0x10000) - goto range; - } else - if(eval >= 0x10000) - goto range; - } - - *locp++ = (char)(eval >> 8); - *locp = (char)eval; - break; - // Fixup LONG forward references; - // the long could be unaligned in the section buffer, so be careful (again). - case FU_LONG: - if((w & 0x0F00) == FU_MOVEI) { - address = loc + 4; - if(eattr & DEFINED) { - for(j = 0; j < fwindex; j++) { - if(fwdjump[j] == address) { - page_jump = (address & 0xFFFFFF00) - (eval & 0xFFFFFF00); - if(page_jump) { - if(eval % 4) { - err_setup(); - sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for long page jump, " - "insert a \'nop\' before the destination address", address); - if(listing > 0) ship_ln(buf); - if(err_flag) write(err_fd, buf, (LONG)strlen(buf)); - else printf("%s\n", buf); - } - } else { - if(!(eval & 0x0000000F) || ((eval - 2) % 4)) { - err_setup(); - sprintf(buf, "* \'jump\' at $%08X - destination address not aligned for short page jump, " - "insert a \'nop\' before the destination address", address); - if(listing > 0) ship_ln(buf); - if(err_flag) write(err_fd, buf, (LONG)strlen(buf)); - else printf("%s\n", buf); - } - } - // Clear this jump as it has been checked - fwdjump[j] = 0; - j = fwindex; - } - } - } - eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000); - flags = (MLONG|MMOVEI); - } else flags = MLONG; - if(!(eattr & DEFINED)) { - rmark(sno, loc, 0, flags, esym); - } - else if(tdb) { - rmark(sno, loc, tdb, flags, NULL); - } - *locp++ = (char)(eval >> 24); - *locp++ = (char)(eval >> 16); - *locp++ = (char)(eval >> 8); - *locp = (char)eval; - break; - // Fixup a 3-bit "QUICK" reference in bits 9..1 - // (range of 1..8) in a word. Really bits 1..3 in a byte. - case FU_QUICK: - if(!(eattr & DEFINED)) { - error("External quick reference"); - continue; - } - - if(eval < 1 || eval > 8) - goto range; - *locp |= (eval & 7) << 1; - break; - // Fix up 6502 funny branch - case FU_6BRA: - eval -= (loc + 1); - if(eval + 0x80 >= 0x100) - goto range; - *locp = (char)eval; - break; - default: - interror(4); // Bad fixup type - // NOTREACHED - } - continue; - - range: - - error("expression out of range"); - } - - ch = ch->chnext; - } while(ch != NULL); - - return(0); +int ResolveAllFixups(void) +{ + // Make undefined symbols GLOBL + if (glob_flag) + ForceUndefinedSymbolsGlobal(); + + DEBUG printf("Resolving TEXT sections...\n"); + ResolveFixups(TEXT); + DEBUG printf("Resolving DATA sections...\n"); + ResolveFixups(DATA); + DEBUG printf("Resolving 6502 sections...\n"); + ResolveFixups(M6502); /* fixup 6502 section (if any) */ + + return 0; } +