mirror of https://github.com/zeldaret/botw.git
63 lines
1.7 KiB
Python
Executable File
63 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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from elftools.elf.elffile import ELFFile
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import diff_settings
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from pathlib import Path
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from typing import Any, Dict
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import utils
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config: Dict[str, Any] = {}
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diff_settings.apply(config, {})
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root = Path(__file__).parent.parent
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my_elf = ELFFile((root / config["myimg"]).open("rb"))
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my_symtab = my_elf.get_section_by_name(".symtab")
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if not my_symtab:
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utils.fail(f'{config["myimg"]} has no symbol table')
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def get_file_offset(elf, addr: int) -> int:
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for seg in elf.iter_segments():
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if seg.header["p_type"] != "PT_LOAD":
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continue
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if seg["p_vaddr"] <= addr < seg["p_vaddr"] + seg["p_filesz"]:
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return addr - seg["p_vaddr"] + seg["p_offset"]
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assert False
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def get_symbol_file_offset_and_size(elf, table, name: str) -> (int, int):
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syms = table.get_symbol_by_name(name)
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if not syms or len(syms) != 1:
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raise KeyError(name)
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return get_file_offset(elf, syms[0]["st_value"]), syms[0]["st_size"]
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def get_fn_from_my_elf(name: str) -> bytes:
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offset, size = get_symbol_file_offset_and_size(my_elf, my_symtab, name)
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my_elf.stream.seek(offset)
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return my_elf.stream.read(size)
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def dump_fn(name: str) -> None:
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expected_dir = root / "expected"
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try:
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fn = get_fn_from_my_elf(name)
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path = expected_dir / f"{name}.bin"
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path.parent.mkdir(exist_ok=True)
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path.write_bytes(fn)
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except KeyError:
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utils.fail("could not find function")
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def main() -> None:
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parser = argparse.ArgumentParser()
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parser.add_argument("function_name", help="Name of the function to dump")
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args = parser.parse_args()
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dump_fn(args.function_name)
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if __name__ == "__main__":
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main()
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