#!/usr/bin/env python3
"""Find 32-bit constants whose target byte offset falls in [lo,hi).

Usage: near_refs.py IMAGE lo hi
"""
import struct
import sys

ROM_BASE = 0x07E40000


def main():
    image = open(sys.argv[1], "rb").read()
    lo = int(sys.argv[2], 0)
    hi = int(sys.argv[3], 0)
    for off in range(0, len(image) - 3):
        v = struct.unpack_from("<I", image, off)[0]
        tgt = (v >> 3) - ROM_BASE
        if lo <= tgt < hi:
            print(f"const@0x{off:06X} = 0x{v:08X} -> target 0x{tgt:06X}")


if __name__ == "__main__":
    main()