ref: f8f67fcbceea754bba2268be11da9b7aba7a285a
dir: /src/link/object.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
/*
* Here we have the routines that read an objectfile
*/
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "extern/err.h"
#include "link/assign.h"
#include "link/mylink.h"
#include "link/main.h"
struct sSymbol **tSymbols;
struct sSection *pSections;
struct sSection *pLibSections;
uint8_t dummymem;
uint8_t oReadLib;
/*
* Read 32-bit values with the correct endianness
*/
static int32_t readlong(FILE *f)
{
int32_t r;
r = fgetc(f);
r |= fgetc(f) << 8;
r |= fgetc(f) << 16;
r |= fgetc(f) << 24;
return r;
}
/*
* Read a NULL terminated string from a file
*/
int32_t readasciiz(char **dest, FILE *f)
{
size_t r = 0;
size_t bufferLength = 16;
char *start = malloc(bufferLength);
char *s = start;
if (!s)
err(1, "%s: Couldn't allocate memory", __func__);
while (((*s++) = fgetc(f)) != 0) {
r += 1;
if (r >= bufferLength) {
bufferLength *= 2;
start = realloc(start, bufferLength);
if (!start) {
err(1, "%s: Couldn't allocate memory",
__func__);
}
s = start + r;
}
}
*dest = start;
return (r + 1);
}
/*
* Allocate a new section and link it into the list
*/
struct sSection *AllocSection(void)
{
struct sSection **ppSections;
if (oReadLib == 1)
ppSections = &pLibSections;
else
ppSections = &pSections;
while (*ppSections)
ppSections = &((*ppSections)->pNext);
*ppSections = malloc(sizeof **ppSections);
if (!*ppSections)
err(1, "%s: Couldn't allocate memory", __func__);
(*ppSections)->tSymbols = tSymbols;
(*ppSections)->pNext = NULL;
(*ppSections)->pPatches = NULL;
(*ppSections)->oAssigned = 0;
return *ppSections;
}
/*
* Read a symbol from a file
*/
struct sSymbol *obj_ReadSymbol(FILE *f, char *tzObjectfile)
{
struct sSymbol *pSym;
pSym = malloc(sizeof(*pSym));
if (!pSym)
err(1, "%s: Couldn't allocate memory", __func__);
readasciiz(&pSym->pzName, f);
pSym->Type = (enum eSymbolType)fgetc(f);
pSym->pzObjFileName = tzObjectfile;
if (pSym->Type != SYM_IMPORT) {
readasciiz(&pSym->pzFileName, f);
pSym->nFileLine = readlong(f);
pSym->nSectionID = readlong(f);
pSym->nOffset = readlong(f);
}
return pSym;
}
/*
* RGB object reader routines
*/
struct sSection *obj_ReadRGBSection(FILE *f)
{
struct sSection *pSection;
char *pzName;
readasciiz(&pzName, f);
if (IsSectionNameInUse(pzName))
errx(1, "Section name \"%s\" is already in use.", pzName);
pSection = AllocSection();
pSection->pzName = pzName;
pSection->nByteSize = readlong(f);
pSection->Type = (enum eSectionType)fgetc(f);
pSection->nOrg = readlong(f);
pSection->nBank = readlong(f);
pSection->nAlign = readlong(f);
if ((options & OPT_TINY) && (pSection->Type == SECT_ROMX))
errx(1, "ROMX sections can't be used with option -t.");
if ((options & OPT_CONTWRAM) && (pSection->Type == SECT_WRAMX))
errx(1, "WRAMX sections can't be used with options -w or -d.");
if (options & OPT_DMG_MODE) {
/* WRAMX sections are checked for OPT_CONTWRAM */
if (pSection->Type == SECT_VRAM && pSection->nBank == 1)
errx(1, "VRAM bank 1 can't be used with option -d.");
}
uint32_t maxsize = 0;
/* Verify that the section isn't too big */
switch (pSection->Type) {
case SECT_ROM0:
maxsize = (options & OPT_TINY) ? 0x8000 : 0x4000;
break;
case SECT_ROMX:
maxsize = 0x4000;
break;
case SECT_VRAM:
case SECT_SRAM:
maxsize = 0x2000;
break;
case SECT_WRAM0:
maxsize = (options & OPT_CONTWRAM) ? 0x2000 : 0x1000;
break;
case SECT_WRAMX:
maxsize = 0x1000;
break;
case SECT_OAM:
maxsize = 0xA0;
break;
case SECT_HRAM:
maxsize = 0x7F;
break;
default:
errx(1, "Section \"%s\" has an invalid section type.", pzName);
break;
}
if (pSection->nByteSize > maxsize) {
errx(1, "Section \"%s\" is bigger than the max size for that type: 0x%X > 0x%X",
pzName, pSection->nByteSize, maxsize);
}
/*
* If the section doesn't contain data, it is ready
*/
if ((pSection->Type != SECT_ROMX) && (pSection->Type != SECT_ROM0))
return pSection;
/* If there is no data to read, exit */
if (pSection->nByteSize == 0) {
/* Skip number of patches */
readlong(f);
pSection->pData = &dummymem;
return pSection;
}
pSection->pData = malloc(pSection->nByteSize);
if (!pSection->pData)
err(1, "%s: Couldn't allocate memory", __func__);
int32_t nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
if (fread(pSection->pData, sizeof(uint8_t), pSection->nByteSize, f)
!= pSection->nByteSize) {
err(1, "%s: Read error", __func__);
}
nNumberOfPatches = readlong(f);
ppPatch = &pSection->pPatches;
/*
* And patches...
*/
while (nNumberOfPatches--) {
pPatch = malloc(sizeof(*pPatch));
if (!pPatch)
err(1, "%s: Couldn't allocate memory", __func__);
*ppPatch = pPatch;
readasciiz(&pPatch->pzFilename, f);
pPatch->nLineNo = readlong(f);
pPatch->nOffset = readlong(f);
pPatch->Type = (enum ePatchType)fgetc(f);
pPatch->nRPNSize = readlong(f);
if (pPatch->nRPNSize > 0) {
pPatch->pRPN = malloc(pPatch->nRPNSize);
if (!pPatch->pRPN) {
err(1, "%s: Couldn't allocate memory",
__func__);
}
if (fread(pPatch->pRPN, sizeof(uint8_t),
pPatch->nRPNSize, f) != pPatch->nRPNSize) {
errx(1, "%s: Read error", __func__);
}
} else {
pPatch->pRPN = NULL;
}
pPatch->pNext = NULL;
ppPatch = &(pPatch->pNext);
}
return pSection;
}
void obj_ReadRGB(FILE *pObjfile, char *tzObjectfile)
{
struct sSection *pFirstSection;
int32_t nNumberOfSymbols, nNumberOfSections, i;
nNumberOfSymbols = readlong(pObjfile);
nNumberOfSections = readlong(pObjfile);
/* First comes the symbols */
if (nNumberOfSymbols) {
tSymbols = malloc(nNumberOfSymbols * sizeof(*tSymbols));
if (!tSymbols)
err(1, "%s: Couldn't allocate memory", __func__);
for (i = 0; i < nNumberOfSymbols; i += 1)
tSymbols[i] = obj_ReadSymbol(pObjfile, tzObjectfile);
} else {
tSymbols = (struct sSymbol **)&dummymem;
}
/* Next we have the sections */
pFirstSection = NULL;
while (nNumberOfSections--) {
struct sSection *pNewSection;
pNewSection = obj_ReadRGBSection(pObjfile);
pNewSection->nNumberOfSymbols = nNumberOfSymbols;
if (pFirstSection == NULL)
pFirstSection = pNewSection;
}
/*
* Fill in the pSection entry in the symbolstructure.
* This REALLY needs some cleaning up... but, hey, it works
*/
for (i = 0; i < nNumberOfSymbols; i += 1) {
struct sSection *pConvSect = pFirstSection;
if ((tSymbols[i]->Type != SYM_IMPORT) &&
(tSymbols[i]->nSectionID != -1)) {
int32_t j = 0;
while (j != tSymbols[i]->nSectionID) {
j += 1;
pConvSect = pConvSect->pNext;
}
tSymbols[i]->pSection = pConvSect;
} else {
tSymbols[i]->pSection = NULL;
}
}
}
/*
* The main objectfileloadroutine (phew)
*/
void obj_ReadOpenFile(FILE *pObjfile, char *tzObjectfile)
{
char tzHeader[strlen(RGBDS_OBJECT_VERSION_STRING) + 1];
if (fread(tzHeader, sizeof(char), strlen(RGBDS_OBJECT_VERSION_STRING),
pObjfile) != strlen(RGBDS_OBJECT_VERSION_STRING)) {
errx(1, "%s: Read error", tzObjectfile);
}
tzHeader[strlen(RGBDS_OBJECT_VERSION_STRING)] = 0;
if (strncmp(tzHeader, RGBDS_OBJECT_VERSION_STRING,
strlen(RGBDS_OBJECT_VERSION_STRING)) == 0) {
obj_ReadRGB(pObjfile, tzObjectfile);
} else {
int32_t i;
for (i = 0; i < strlen(RGBDS_OBJECT_VERSION_STRING); i++)
if (!isprint(tzHeader[i]))
tzHeader[i] = '?';
errx(1, "%s: Invalid file or object file version [%s]",
tzObjectfile, tzHeader);
}
}
void obj_Readfile(char *tzObjectfile)
{
FILE *pObjfile;
if (options & OPT_SMART_C_LINK)
oReadLib = 1;
else
oReadLib = 0;
pObjfile = fopen(tzObjectfile, "rb");
if (pObjfile == NULL)
err(1, "Unable to open object '%s'", tzObjectfile);
obj_ReadOpenFile(pObjfile, tzObjectfile);
fclose(pObjfile);
oReadLib = 0;
}
int32_t file_Length(FILE *f)
{
uint32_t r, p;
p = ftell(f);
fseek(f, 0, SEEK_END);
r = ftell(f);
fseek(f, p, SEEK_SET);
return r;
}