ref: ffdb1fbfe5e74ba9015ffaf0285f61a8e71d95b1
dir: /src/asm/output.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
/*
* Outputs an objectfile
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "asm/asm.h"
#include "asm/charmap.h"
#include "asm/fstack.h"
#include "asm/main.h"
#include "asm/output.h"
#include "asm/rpn.h"
#include "asm/section.h"
#include "asm/symbol.h"
#include "asm/warning.h"
#include "extern/err.h"
#include "linkdefs.h"
struct Patch {
char tzFilename[_MAX_PATH + 1];
uint32_t nOffset;
uint8_t nType;
uint32_t nRPNSize;
uint8_t *pRPN;
struct Patch *pNext;
};
struct PatchSymbol {
uint32_t ID;
struct sSymbol const *pSymbol;
struct PatchSymbol *pNext;
struct PatchSymbol *pBucketNext; /* next symbol in hash table bucket */
};
struct PatchSymbol *tHashedPatchSymbols[HASHSIZE];
struct Section *pSectionList, *pCurrentSection;
struct PatchSymbol *pPatchSymbols;
struct PatchSymbol **ppPatchSymbolsTail = &pPatchSymbols;
char *tzObjectname;
/*
* Count the number of symbols used in this object
*/
static uint32_t countsymbols(void)
{
struct PatchSymbol *pSym;
uint32_t count = 0;
pSym = pPatchSymbols;
while (pSym) {
count++;
pSym = pSym->pNext;
}
return count;
}
/*
* Count the number of sections used in this object
*/
static uint32_t countsections(void)
{
struct Section *pSect;
uint32_t count = 0;
pSect = pSectionList;
while (pSect) {
count++;
pSect = pSect->pNext;
}
return count;
}
/*
* Count the number of patches used in this object
*/
static uint32_t countpatches(struct Section *pSect)
{
struct Patch *pPatch;
uint32_t r = 0;
pPatch = pSect->pPatches;
while (pPatch) {
r++;
pPatch = pPatch->pNext;
}
return r;
}
/*
* Write a long to a file (little-endian)
*/
static void fputlong(uint32_t i, FILE *f)
{
fputc(i, f);
fputc(i >> 8, f);
fputc(i >> 16, f);
fputc(i >> 24, f);
}
/*
* Write a NULL-terminated string to a file
*/
static void fputstring(char const *s, FILE *f)
{
while (*s)
fputc(*s++, f);
fputc(0, f);
}
/*
* Return a section's ID
*/
static uint32_t getsectid(struct Section *pSect)
{
struct Section *sec;
uint32_t ID = 0;
sec = pSectionList;
while (sec) {
if (sec == pSect)
return ID;
ID++;
sec = sec->pNext;
}
fatalerror("Unknown section '%s'", pSect->pzName);
}
/*
* Write a patch to a file
*/
static void writepatch(struct Patch *pPatch, FILE *f)
{
fputstring(pPatch->tzFilename, f);
fputlong(pPatch->nOffset, f);
fputc(pPatch->nType, f);
fputlong(pPatch->nRPNSize, f);
fwrite(pPatch->pRPN, 1, pPatch->nRPNSize, f);
}
/*
* Write a section to a file
*/
static void writesection(struct Section *pSect, FILE *f)
{
fputstring(pSect->pzName, f);
fputlong(pSect->nPC, f);
fputc(pSect->nType, f);
fputlong(pSect->nOrg, f);
fputlong(pSect->nBank, f);
fputlong(pSect->nAlign, f);
if (sect_HasData(pSect->nType)) {
struct Patch *pPatch;
fwrite(pSect->tData, 1, pSect->nPC, f);
fputlong(countpatches(pSect), f);
pPatch = pSect->pPatches;
while (pPatch) {
writepatch(pPatch, f);
pPatch = pPatch->pNext;
}
}
}
/*
* Write a symbol to a file
*/
static void writesymbol(struct sSymbol const *pSym, FILE *f)
{
uint32_t type;
uint32_t offset;
int32_t sectid;
if (!sym_IsDefined(pSym))
type = SYMTYPE_IMPORT;
else if (pSym->isExported)
type = SYMTYPE_EXPORT;
else
type = SYMTYPE_LOCAL;
switch (type) {
case SYMTYPE_LOCAL:
offset = pSym->nValue;
sectid = getsectid(pSym->pSection);
break;
case SYMTYPE_IMPORT:
offset = 0;
sectid = -1;
break;
case SYMTYPE_EXPORT:
offset = pSym->nValue;
if (pSym->type != SYM_LABEL)
sectid = -1;
else
sectid = getsectid(pSym->pSection);
break;
}
fputstring(pSym->tzName, f);
fputc(type, f);
if (type != SYMTYPE_IMPORT) {
fputstring(pSym->tzFileName, f);
fputlong(pSym->nFileLine, f);
fputlong(sectid, f);
fputlong(offset, f);
}
}
/*
* Add a symbol to the object
*/
static uint32_t nextID;
static uint32_t addsymbol(struct sSymbol const *pSym)
{
struct PatchSymbol *pPSym, **ppPSym;
uint32_t hash;
hash = sym_CalcHash(pSym->tzName);
ppPSym = &(tHashedPatchSymbols[hash]);
while ((*ppPSym) != NULL) {
if (pSym == (*ppPSym)->pSymbol)
return (*ppPSym)->ID;
ppPSym = &((*ppPSym)->pBucketNext);
}
pPSym = malloc(sizeof(struct PatchSymbol));
*ppPSym = pPSym;
if (pPSym == NULL)
fatalerror("No memory for patchsymbol");
pPSym->pNext = NULL;
pPSym->pBucketNext = NULL;
pPSym->pSymbol = pSym;
pPSym->ID = nextID++;
*ppPatchSymbolsTail = pPSym;
ppPatchSymbolsTail = &(pPSym->pNext);
return pPSym->ID;
}
/*
* Add all exported symbols to the object
*/
static void addexports(void)
{
int32_t i;
for (i = 0; i < HASHSIZE; i++) {
struct sSymbol *pSym;
pSym = tHashedSymbols[i];
while (pSym) {
if (pSym->isExported)
addsymbol(pSym);
pSym = pSym->pNext;
}
}
}
/*
* Allocate a new patchstructure and link it into the list
*/
struct Patch *allocpatch(void)
{
struct Patch *pPatch;
pPatch = malloc(sizeof(struct Patch));
if (pPatch == NULL)
fatalerror("No memory for patch");
pPatch->pNext = pCurrentSection->pPatches;
pPatch->nRPNSize = 0;
pPatch->pRPN = NULL;
pCurrentSection->pPatches = pPatch;
return pPatch;
}
/*
* Create a new patch (includes the rpn expr)
*/
void out_CreatePatch(uint32_t type, struct Expression const *expr)
{
struct Patch *pPatch;
uint8_t *rpnexpr;
char tzSym[512];
uint32_t rpnptr = 0, symptr;
rpnexpr = malloc(expr->nRPNPatchSize);
if (rpnexpr == NULL)
fatalerror("No memory for patch RPN expression");
pPatch = allocpatch();
pPatch->nType = type;
fstk_DumpToStr(pPatch->tzFilename, sizeof(pPatch->tzFilename));
pPatch->nOffset = pCurrentSection->nPC;
for (size_t offset = 0; offset < expr->nRPNLength; ) {
#define popbyte(expr) (expr)->tRPN[offset++]
uint8_t rpndata = popbyte(expr);
switch (rpndata) {
case RPN_CONST:
rpnexpr[rpnptr++] = RPN_CONST;
rpnexpr[rpnptr++] = popbyte(expr);
rpnexpr[rpnptr++] = popbyte(expr);
rpnexpr[rpnptr++] = popbyte(expr);
rpnexpr[rpnptr++] = popbyte(expr);
break;
case RPN_SYM:
{
symptr = 0;
while ((tzSym[symptr++] = popbyte(expr)) != 0)
;
struct sSymbol const *sym = sym_FindSymbol(tzSym);
if (!sym) {
break; // TODO: wtf?
} else if (sym_IsConstant(sym)) {
uint32_t value;
value = sym_GetConstantValue(tzSym);
rpnexpr[rpnptr++] = RPN_CONST;
rpnexpr[rpnptr++] = value & 0xFF;
rpnexpr[rpnptr++] = value >> 8;
rpnexpr[rpnptr++] = value >> 16;
rpnexpr[rpnptr++] = value >> 24;
} else {
symptr = addsymbol(sym);
rpnexpr[rpnptr++] = RPN_SYM;
rpnexpr[rpnptr++] = symptr & 0xFF;
rpnexpr[rpnptr++] = symptr >> 8;
rpnexpr[rpnptr++] = symptr >> 16;
rpnexpr[rpnptr++] = symptr >> 24;
}
break;
}
case RPN_BANK_SYM:
{
struct sSymbol *sym;
symptr = 0;
while ((tzSym[symptr++] = popbyte(expr)) != 0)
;
sym = sym_FindSymbol(tzSym);
if (sym == NULL)
break;
symptr = addsymbol(sym);
rpnexpr[rpnptr++] = RPN_BANK_SYM;
rpnexpr[rpnptr++] = symptr & 0xFF;
rpnexpr[rpnptr++] = symptr >> 8;
rpnexpr[rpnptr++] = symptr >> 16;
rpnexpr[rpnptr++] = symptr >> 24;
break;
}
case RPN_BANK_SECT:
{
uint16_t b;
rpnexpr[rpnptr++] = RPN_BANK_SECT;
do {
b = popbyte(expr);
rpnexpr[rpnptr++] = b & 0xFF;
} while (b != 0);
break;
}
default:
rpnexpr[rpnptr++] = rpndata;
break;
}
#undef popbyte
}
assert(rpnptr == expr->nRPNPatchSize);
pPatch->pRPN = rpnexpr;
pPatch->nRPNSize = rpnptr;
}
/*
* Write an objectfile
*/
void out_WriteObject(void)
{
FILE *f;
struct PatchSymbol *pSym;
struct Section *pSect;
addexports();
f = fopen(tzObjectname, "wb");
if (!f)
err(1, "Couldn't write file '%s'", tzObjectname);
fprintf(f, RGBDS_OBJECT_VERSION_STRING, RGBDS_OBJECT_VERSION_NUMBER);
fputlong(RGBDS_OBJECT_REV, f);
fputlong(countsymbols(), f);
fputlong(countsections(), f);
pSym = pPatchSymbols;
while (pSym) {
writesymbol(pSym->pSymbol, f);
pSym = pSym->pNext;
}
pSect = pSectionList;
while (pSect) {
writesection(pSect, f);
pSect = pSect->pNext;
}
fclose(f);
}
/*
* Set the objectfilename
*/
void out_SetFileName(char *s)
{
tzObjectname = s;
if (CurrentOptions.verbose)
printf("Output filename %s\n", s);
}