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73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
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#!/usr/bin/env python3
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############################################################################
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# arch/sim/src/patch_macho_initsection.py
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied. See the License for the specific language governing
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# permissions and limitations under the License.
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#
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############################################################################
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"""Patch Mach-O init section type flags to prevent dyld from
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auto-running C++ constructors.
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Changes MOD_INIT_FUNC_POINTERS (0x9) section types to REGULAR (0x0)
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so that dyld ignores them. NuttX will invoke the constructors
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explicitly from lib_cxx_initialize().
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Requires: pip install lief
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"""
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import argparse
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import sys
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try:
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import lief
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except ImportError:
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print(
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"Error: lief is required. Install with: pip install lief",
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file=sys.stderr,
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)
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sys.exit(1)
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def main():
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parser = argparse.ArgumentParser(description="Patch Mach-O init section type flags")
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parser.add_argument("binary", help="Path to the Mach-O binary")
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args = parser.parse_args()
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binary = lief.MachO.parse(args.binary)
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if binary is None:
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print(f"Error: failed to parse {args.binary}", file=sys.stderr)
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sys.exit(1)
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fat = binary.at(0)
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T = lief.MachO.Section.TYPE
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patched = 0
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for section in fat.sections:
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if section.type == T.MOD_INIT_FUNC_POINTERS:
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section.type = T.REGULAR
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patched += 1
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if patched:
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fat.write(args.binary)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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