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#!/usr/bin/env python3
import struct, sys, argparse
import elftools.elf.elffile
# Patches driverominit.o to change bnez t6,3c to nop at offset 0x20 in the .text section
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:
elf = elftools.elf.elffile.ELFFile(f)
text_offset = 0
for section in elf.iter_sections():
if section.name == ".text":
text_offset = section["sh_offset"]
break
if text_offset == 0:
print("Error: .text section not found")
sys.exit(1)
f.seek(text_offset + 0x20)
instruction = struct.unpack(">I", f.read(4))[0]
if instruction != 0x15C00006: # bnez t6,3c
print("Error: expected instruction not found, found 0x%08X" % instruction)
sys.exit(1)
f.seek(text_offset + 0x20)
f.write(struct.pack(">I", 0x00000000)) # nop
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