#!/usr/bin/env python3

import argparse, struct, sys

if __name__ == '__main__':

parser = argparse.ArgumentParser()

parser.add_argument('file', help='input file')

args = parser.parse_args()

with open(args.file, 'r+b') as f:

magic = struct.unpack('>I', f.read(4))[0]

if magic != 0x7F454C46:

print('Error: Not an ELF file')

sys.exit(1)

f.seek(36)

flags = struct.unpack('>I', f.read(4))[0]

if flags & 0xF0000000 != 0x20000000: # test for mips3

print('Error: Architecture not mips3')

sys.exit(1)

flags |= 0x00001000 # set EF_MIPS_ABI_O32

f.seek(36)

f.write(struct.pack('>I', flags))