elf2bin

#!/usr/bin/python3
"""

Convert an ELF file into a binary file.

Copyright (C) 2018, Guillaume Gonnet
License MIT

"""

import argparse
import subprocess
import os.path as path


# GNU objcopy
GCC_PREFIX = "/opt/mips-toolchain/bin/mips-sde-elf-"
OBJCOPY = "%sobjcopy" % GCC_PREFIX

# Sections to use
SECTIONS = ("text", "data", "sdata", "bss", "rodata", "irq_vec")


def elf_to_bin(inname, outname, gap_fill):
    "Convert an ELF file into binary."

    args = ["-O",  "binary"]
    args += ["--only-section=.%s" % s for s in SECTIONS]

    if gap_fill:
        args += ["--gap-fill", "0xFF"]

    subprocess.call([OBJCOPY, *args, inname, outname])
    assert path.isfile(outname), "The binary file has not been generated."



def main():
    "Entry point of the application."

    parser = argparse.ArgumentParser(prog="elf2bin",
        description="Convert an ELF file into a binary file.")

    parser.add_argument("elf", help="input ELF filename (.elf)")

    parser.add_argument("-o", help="output binary filename (.bin)",
        default=None, metavar="outname")

    parser.add_argument("-FF", help="replace empty sections by 0xFF",
        action="store_true")

    args = parser.parse_args()

    if not args.o:
        args.o = args.elf.replace(".elf", ".bin")

    elf_to_bin(args.elf, args.o, args.FF)


if __name__ == "__main__":
    main()