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/*
* elf2exe
*
* Converts an ELF executable to PS-EXE, using objcopy
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const unsigned char psexe_magic[8] = {'P','S','-','X',' ','E','X','E'};
const char *psexe_marker_usa = "Sony Computer Entertainment Inc. for North America area";
const char *psexe_marker_jpn = "Sony Computer Entertainment Inc. for Japan area";
const char *psexe_marker_eur = "Sony Computer Entertainment Inc. for Europe area";
char *psexe_marker;
//#define OBJCOPY_PATH "mipsel-unknown-elf-objcopy"
int main(int argc, char *argv[])
{
FILE *objcopy_out, *psexe;
char stringbuf[2048];
unsigned char charbuf;
int x;
unsigned int sz;
unsigned int gp = 0;
if(argc < 3)
{
printf("elf2exe - Converts an ELF executable to PS-EXE\n");
printf("usage: elf2exe [elf] [ps-x exe] <options>\n");
printf("\n");
printf("Options:\n");
printf("-mark_jpn - Use Japanese ascii marker (default: USA)\n");
printf("-mark_eur - Use European ascii marker (default: USA)\n");
printf("-mark=<mark> - Use custom ascii marker <mark>\n");
return -1;
}
psexe_marker = (char*)psexe_marker_usa;
for(x = 3; x < argc; x++)
{
if(strcmp(argv[x], "-mark_jpn") == 0)
psexe_marker = (char*)psexe_marker_jpn;
if(strcmp(argv[x], "-mark_eur") == 0)
psexe_marker = (char*)psexe_marker_eur;
if(strncmp(argv[x], "-mark=", 6) == 0)
{
if(strlen(argv[x]) >= 7)
psexe_marker = argv[x] + 6;
}
if(strncmp(argv[x], "-gp=", 4) == 0)
{
if(strlen(argv[x]) >= 5)
sscanf(argv[x] + 4, "%x", &gp);
}
}
/*
* Now open the output file
*/
psexe = fopen(argv[2], "wb");
if(psexe == NULL)
{
printf("Couldn't open %s for writing. Aborting!\n", argv[2]);
return -1;
}
/*
* Write PSEXE magic string
*/
fwrite(psexe_magic, sizeof(char), 8, psexe);
/*
* Seek output file to 0x10, Initial Program Counter
*/
fseek(psexe, 0x10, SEEK_SET);
/*
* Write initial program counter = 0x80010000
*/
charbuf = 0x00;
fwrite(&charbuf, sizeof(char), 1, psexe);
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x01;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x80;
fwrite(&charbuf, sizeof(char), 1, psexe);
/*
* Global Pointer
*/
charbuf = gp & 0xff;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (gp & 0xff00) >> 8;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (gp & 0xff0000) >> 16;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (gp & 0xff000000) >> 24;
fwrite(&charbuf, sizeof(char), 1, psexe);
/*
* Seek output file to 0x18, Text section start address
*/
fseek(psexe, 0x18, SEEK_SET);
/*
* Write text section start address = 0
*/
charbuf = 0x00;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x00;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x01;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x80;
fwrite(&charbuf, sizeof(char), 1, psexe);
/*
* Seek output file to 0x30, Initial Stack Pointer
*/
fseek(psexe, 0x30, SEEK_SET);
/*
* Write Initial Stack Pointer = 0x801FFFF0
*/
charbuf = 0xF0;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0xFF;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x1F;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = 0x80;
fwrite(&charbuf, sizeof(char), 1, psexe);
/*
* Seek output to 0x4C, ASCII marker
*/
fseek(psexe, 0x4C, SEEK_SET);
x = 0;
/*
* Write ASCII marker string
*/
while(psexe_marker[x])
fwrite(&psexe_marker[x++], sizeof(char), 1, psexe);
/*
* Run objcopy now
*/
sprintf(stringbuf, OBJCOPY_PATH" -O binary %s %s.bin", argv[1], argv[1]);
system(stringbuf);
sprintf(stringbuf, "%s.bin", argv[1]);
/*
* Open objcopy output
*/
objcopy_out = fopen(stringbuf, "rb");
if(objcopy_out == NULL)
{
printf("Could not open objcopy output at %s. Check your permissions. Aborting.\n",
stringbuf);
return -1;
}
/*
* Seek to 0x800, Program Start
* and write the output of objcopy into the PS-X EXE
*/
fseek(psexe, 0x800, SEEK_SET);
while(!feof(objcopy_out))
{
x = fgetc(objcopy_out);
fputc(x, psexe);
}
fclose(objcopy_out);
/*
* Get the file size of the PS-X EXE
*/
fseek(psexe, 0, SEEK_END);
sz = ftell(psexe);
fseek(psexe, 0, SEEK_SET);
if(sz % 2048 != 0)
{
fseek(psexe, (((sz / 2048) + 1)*2048) - 1, SEEK_SET);
fwrite(&charbuf, sizeof(char), 1, psexe);
sz = ftell(psexe);
}
/*
* Write the address of the text section in the header of the PS-X EXE
*/
sz -= 0x800;
fseek(psexe, 0x1C, SEEK_SET);
charbuf = sz & 0xff;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (sz & 0xff00) >> 8;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (sz & 0xff0000) >> 16;
fwrite(&charbuf, sizeof(char), 1, psexe);
charbuf = (sz & 0xff000000) >> 24;
fwrite(&charbuf, sizeof(char), 1, psexe);
fclose(psexe);
/*
* Remove objcopy output
*/
sprintf(stringbuf, "%s.bin", argv[1]);
remove(stringbuf);
return 0;
}
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