mirror of
https://github.com/facebookexperimental/reverie.git
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fa44c91a66
Summary: Helper script for debugging https://github.com/facebookexperimental/hermit/issues/16. Differential Revision: D41565407 fbshipit-source-id: 01cd3121dde671a563a8d2674cc42bfa6bce1226
57 lines
1.4 KiB
Python
Executable file
57 lines
1.4 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the BSD-style license found in the
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# LICENSE file in the root directory of this source tree.
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"""
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Dumps VDSO to the given file. This is useful for debugging why Reverie might not
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be able to patch VDSO entries.
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Usage: ./dump-vdso.py [filename]
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Examples:
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./dump-vdso.py | hexdump -C
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./dump-vdso.py vdso.so && objdump -d vdso.so
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"""
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import argparse
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import ctypes
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import sys
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from typing import List, Optional
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def dump_vdso() -> Optional[List[ctypes.c_ubyte]]:
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"""
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Returns a list containing the VDSO.
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"""
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with open("/proc/self/maps") as f:
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for line in f:
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if "[vdso]" in line:
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start, end = [int(x, 16) for x in line.split(" ")[0].split("-")]
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length = end - start
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return (ctypes.c_ubyte * length).from_address(start)
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def main() -> int:
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parser = argparse.ArgumentParser(
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prog="dump-vdso", description="Dumps VDSO to the given file."
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)
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parser.add_argument("filename", nargs="?", help="Filename to write to.")
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args = parser.parse_args()
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data = dump_vdso()
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if args.filename:
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with open(args.filename, "wb") as f:
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f.write(data)
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else:
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sys.stdout.buffer.write(data)
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return 0
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if __name__ == "__main__":
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main()
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