//
-// 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, 2011-2018 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"
+
+
+// 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
+
+// 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)
+{
+ // Initialize all sections
+ for(int i=0; i<NSECTS; i++)
+ MakeSection(i, 0);
+
+ // Construct default sections, make TEXT the current section
+ MakeSection(ABS, SUSED | SABS | SBSS); // ABS
+ MakeSection(TEXT, SUSED | TEXT ); // TEXT
+ MakeSection(DATA, SUSED | DATA ); // DATA
+ MakeSection(BSS, SUSED | BSS | SBSS); // BSS
+ MakeSection(M6502, SUSED | TEXT ); // 6502 code section
+
+ // Switch to TEXT for starters
+ SwitchSection(TEXT);
}
+
//
-// --- Switch to Another Section (Copy Section & Chunk Descriptors to Global Vars for Fast Access) -
+// Make a new (clean) section
//
-
-void switchsect(int sno) {
- SECT *p; // Section pointer
- CHUNK *cp; // Chunk pointer
-
- cursect = sno;
- p = §[sno];
-
- scattr = p->scattr; // 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->orgaddr = 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;
+ orgaddr = p->orgaddr;
+
+ // 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;
}
+
//
-// --- 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;
+ p->orgaddr = orgaddr;
- // 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
-
- switchsect(TEXT); // Switch to TEXT for starters
+ if (scode != NULL) // Bailout code chunk
+ scode->ch_size = ch_size;
}
+
//
-// -------------------------------------------------------------------------------------------------
-// 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 set 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)
+{
+ // Force update to sect[] variables
+ StopMark();
+
+ // 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 anyway.
+ for(FIXUP * fp=sect[sno].sffix; fp!=NULL; fp=fp->next)
+ {
+ uint32_t w = fp->attr;
+ uint32_t xloc = fp->loc + (int)fusizoffs[w & FUMASK];
+
+ if (xloc == loc)
+ return (int)fusiztab[w & FUMASK];
+ }
+
+ 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 CH_CODE_SIZE bytes or
+// 'amt', whichever is larger.
+//
+// If 'amt' is zero, ensure there are at least CH_THRESHOLD bytes, likewise.
+//
+void chcheck(uint32_t amt)
+{
+ DEBUG { printf("chcheck(%u)\n", amt); }
+
+ // If in BSS section, no allocation required
+ if (scattr & SBSS)
+ return;
+
+ if (amt == 0)
+ 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;
+
+ 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;
}
+
//
-// --- Arrange for a fixup on a location -----------------------------------------------------------
+// Arrange for a fixup on a location
//
-
-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);
+int AddFixup(uint32_t attr, uint32_t loc, TOKEN * fexpr)
+{
+ uint16_t exprlen = 0;
+ SYM * symbol = NULL;
+ uint32_t _orgaddr = 0;
+
+ // First, check to see if the expression is a bare label, otherwise, force
+ // the FU_EXPR flag into the attributes and count the tokens.
+ if ((fexpr[0] == SYMBOL) && (fexpr[2] == ENDEXPR))
+ {
+ symbol = symbolPtr[fexpr[1]];
+
+ // Save the org address for JR RISC instruction
+ if ((attr & FUMASKRISC) == FU_JR)
+ _orgaddr = orgaddr;
+ }
+ else
+ {
+ attr |= FU_EXPR;
+ exprlen = ExpressionLength(fexpr);
+ }
+
+ // Allocate space for the fixup + any expression
+ FIXUP * fixup = malloc(sizeof(FIXUP) + (sizeof(TOKEN) * exprlen));
+
+ // Store the relevant fixup information in the FIXUP
+ fixup->next = NULL;
+ fixup->attr = attr;
+ fixup->loc = loc;
+ fixup->fileno = cfileno;
+ fixup->lineno = curlineno;
+ fixup->expr = NULL;
+ fixup->symbol = symbol;
+ fixup->orgaddr = _orgaddr;
+
+ // Copy the passed in expression to the FIXUP, if any
+ if (exprlen > 0)
+ {
+ fixup->expr = (TOKEN *)((uint8_t *)fixup + sizeof(FIXUP));
+ memcpy(fixup->expr, fexpr, sizeof(TOKEN) * exprlen);
+ }
+
+ // Finally, put the FIXUP in the current section's linked list
+ if (sect[cursect].sffix == NULL)
+ {
+ sect[cursect].sffix = fixup;
+ sect[cursect].sfix = fixup;
+ }
+ else
+ {
+ sect[cursect].sfix->next = fixup;
+ sect[cursect].sfix = fixup;
+ }
+
+ DEBUG { printf("AddFixup: sno=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", cursect, fixup->lineno, fixup->attr, fixup->loc, (void *)fixup->expr, (void *)fixup->symbol, fixup->orgaddr);
+ if (symbol != NULL)
+ printf(" name: %s, value: $lX\n", symbol->sname, symbol->svalue);
+ }
+
+ return 0;
}
+
//
-// --- Resolve all Fixups --------------------------------------------------------------------------
+// Resolve fixups in the passed in 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 $%08X - destination address is external to this source file and "
- "cannot have its aligment validated", fwdjump[i]);
- if(listing > 0) ship_ln(buf);
- if(err_flag) write(err_fd, buf, (LONG)strlen(buf));
- else printf("%s\n", buf);
- }
- }
-
- return(0);
+int ResolveFixups(int sno)
+{
+ SECT * sc = §[sno];
+
+ // "Cache" first chunk
+ CHUNK * cch = sc->sfcode;
+
+ // Can't fixup a section with nothing in it
+ if (cch == NULL)
+ return 0;
+
+ // Wire the 6502 segment's size to its allocated size (64K)
+ if (sno == M6502)
+ cch->ch_size = cch->challoc;
+
+ // Get first fixup for the passed in section
+ FIXUP * fixup = sect[sno].sffix;
+
+ while (fixup != NULL)
+ {
+ // We do it this way because we have continues everywhere... :-P
+ FIXUP * fup = fixup;
+ fixup = fixup->next;
+
+ uint32_t w = fup->attr; // Fixup long (type + modes + flags)
+ uint32_t loc = fup->loc; // Location to fixup
+ cfileno = fup->fileno;
+ curlineno = fup->lineno;
+ DEBUG { printf("ResolveFixups: sect#=%u, l#=%u, attr=$%X, loc=$%X, expr=%p, sym=%p, org=$%X\n", sno, fup->lineno, fup->attr, fup->loc, (void *)fup->expr, (void *)fup->symbol, fup->orgaddr); }
+
+ // 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();
+
+ // 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) is out of range--this should never happen!
+ // Once we call this function, it winds down immediately; it
+ // doesn't return.
+ interror(7);
+ }
+ }
+
+ // Location to fix (in current chunk)
+ // We use the address of the chunk that loc is actually in, then
+ // subtract the chunk's starting location from loc to get the offset
+ // into the current chunk.
+ uint8_t * locp = cch->chptr + (loc - cch->chloc);
+
+ uint16_t eattr = 0; // Expression attrib
+ SYM * esym = NULL; // External symbol involved in expr
+ uint64_t eval; // Expression value
+ uint16_t flags; // Mark flags
+
+ // Compute expression/symbol value and attributes
+
+ // Complex expression
+ if (w & FU_EXPR)
+ {
+ if (evexpr(fup->expr, &eval, &eattr, &esym) != OK)
+ continue;
+ }
+ // Simple symbol
+ else
+ {
+ SYM * sy = fup->symbol;
+ 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/symbol 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 -= loc;
+ else if (tdb)
+ {
+ // Allow cross-section PCREL fixups in Alcyon mode
+ if (prg_flag)
+ {
+ switch (tdb)
+ {
+ case TEXT:
+// Shouldn't there be a break here, since otherwise, it will point to the DATA section?
+// break;
+ case DATA:
+ eval += sect[TEXT].sloc;
+ break;
+ case BSS:
+ eval += sect[TEXT].sloc + sect[DATA].sloc;
+ break;
+ default:
+ error("invalid section");
+ break;
+ }
+
+ eval -= loc;
+ }
+ else
+ {
+ 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 -= loc;
+
+ tdb = 0;
+ eattr &= ~TDB;
+ }
+
+ // Handle 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)
+ {
+ if (CHECK_OPTS(OPT_NULL_BRA))
+ {
+ // Just output a NOP
+ *locp++ = 0x4E;
+ *locp = 0x71;
+ continue;
+ }
+ else
+ {
+ 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);
+ break;
+
+ case FU_BYTEL:
+ if (!(eattr & DEFINED))
+ {
+ error("external byte reference");
+ continue;
+ }
+
+ *locp = (uint8_t)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 & FUMASKRISC) == FU_JR)
+ {
+ int reg;
+
+ if (fup->orgaddr)
+ reg = (signed)((eval - (fup->orgaddr + 2)) / 2);
+ else
+ reg = (signed)((eval - (loc + 2)) / 2);
+
+ if ((reg < -16) || (reg > 15))
+ {
+ error("relative jump out of range");
+ break;
+ }
+
+ *locp |= ((uint8_t)reg >> 3) & 0x03;
+ locp++;
+ *locp |= ((uint8_t)reg & 0x07) << 5;
+ break;
+ }
+ else if ((w & FUMASKRISC) == FU_NUM15)
+ {
+ if (((int)eval < -16) || ((int)eval > 15))
+ {
+ error("constant out of range (-16 - +15)");
+ break;
+ }
+
+ *locp |= ((uint8_t)eval >> 3) & 0x03;
+ locp++;
+ *locp |= ((uint8_t)eval & 0x07) << 5;
+ break;
+ }
+ else if ((w & FUMASKRISC) == FU_NUM31)
+ {
+ if (eval > 31)
+ {
+ error("constant out of range (0-31)");
+ break;
+ }
+
+ *locp |= ((uint8_t)eval >> 3) & 0x03;
+ locp++;
+ *locp |= ((uint8_t)eval & 0x07) << 5;
+ break;
+ }
+ else if ((w & FUMASKRISC) == FU_NUM32)
+ {
+ if ((eval < 1) || (eval > 32))
+ {
+ error("constant out of range (1-32)");
+ break;
+ }
+
+ if (w & FU_SUB32)
+ eval = (32 - eval);
+
+ eval = (eval == 32) ? 0 : eval;
+ *locp |= ((uint8_t)eval >> 3) & 0x03;
+ locp++;
+ *locp |= ((uint8_t)eval & 0x07) << 5;
+ break;
+ }
+ else if ((w & FUMASKRISC) == FU_REGONE)
+ {
+ if (eval > 31)
+ {
+ error("register one value out of range");
+ break;
+ }
+
+ *locp |= ((uint8_t)eval >> 3) & 0x03;
+ locp++;
+ *locp |= ((uint8_t)eval & 0x07) << 5;
+ break;
+ }
+ else if ((w & FUMASKRISC) == FU_REGTWO)
+ {
+ if (eval > 31)
+ {
+ error("register two value out of range");
+ break;
+ }
+
+ locp++;
+ *locp |= (uint8_t)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;
+
+ // Fixup a 4-byte float
+ case FU_FLOATSING:
+ warn("FU_FLOATSING missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
+ break;
+
+ // Fixup a 8-byte float
+ case FU_FLOATDOUB:
+ warn("FU_FLOATDOUB missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
+ break;
+
+ // Fixup a 12-byte float
+ case FU_FLOATEXT:
+ warn("FU_FLOATEXT missing implementation\n%s", "And you may ask yourself, \"Self, how did I get here?\"");
+ break;
+
+ default:
+ // Bad fixup type--this should *never* happen!
+ // Once we call this function, it winds down immediately; it
+ // doesn't return.
+ interror(4);
+ }
+
+ continue;
+rangeErr:
+ error("expression out of range");
+ }
+
+ 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;
}
+
projects / rmac / blobdiff