diff options
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/libc_early_init_name.py | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/scripts/libc_early_init_name.py b/scripts/libc_early_init_name.py deleted file mode 100644 index a56c2008f3..0000000000 --- a/scripts/libc_early_init_name.py +++ /dev/null @@ -1,89 +0,0 @@ -#!/usr/bin/python3 -# Compute the hash-based name of the __libc_early_init function. -# Copyright (C) 2022 Free Software Foundation, Inc. -# This file is part of the GNU C Library. -# -# The GNU C Library is free software; you can redistribute it and/or -# modify it under the terms of the GNU Lesser General Public -# License as published by the Free Software Foundation; either -# version 2.1 of the License, or (at your option) any later version. -# -# The GNU C Library is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -# Lesser General Public License for more details. -# -# You should have received a copy of the GNU Lesser General Public -# License along with the GNU C Library; if not, see -# <https://www.gnu.org/licenses/>. - -"""Compute the name of the __libc_early_init function, which is used -as a protocol version marker between ld.so and libc.so. - -The name contains a hash suffix, and the hash changes if certain key -files in the source tree change. Distributions can also configure -with --with-extra-version-id, to make the computed hash dependent on -the package version. - -""" - -import argparse -import hashlib -import os -import string -import sys - -def gnu_hash(s): - """Computes the GNU hash of the string.""" - h = 5381 - for ch in s: - if type(ch) is not int: - ch = ord(ch) - h = (h * 33 + ch) & 0xffffffff - return h - -# Parse the command line. -parser = argparse.ArgumentParser(description=__doc__) -parser.add_argument('--output', metavar='PATH', - help='path to header file this tool generates') -parser.add_argument('--extra-version-id', metavar='ID', - help='extra string to influence hash computation') -parser.add_argument('inputs', metavar='PATH', nargs='*', - help='files whose contents influences the generated hash') -opts = parser.parse_args() - -# Obtain the blobs that affect the generated hash. -blobs = [(opts.extra_version_id or '').encode('UTF-8')] -for path in opts.inputs: - with open(path, 'rb') as inp: - blobs.append(inp.read()) - -# Hash the file boundaries. -md = hashlib.sha256() -md.update(repr([len(blob) for blob in blobs]).encode('UTF-8')) - -# And then hash the file contents. Do not hash the paths, to avoid -# impacting reproducibility. -for blob in blobs: - md.update(blob) - -# These are the bits used to compute the suffix. -derived_bits = int.from_bytes(md.digest(), byteorder='big', signed=False) - -# These digits are used in the suffix (should result in base-62 encoding). -# They must be valid in C identifiers. -digits = string.digits + string.ascii_letters - -# Generate eight digits as a suffix. They should provide enough -# uniqueness (47.6 bits). -name = '__libc_early_init_' -for n in range(8): - name += digits[derived_bits % len(digits)] - derived_bits //= len(digits) - -# Write the output file. -with open(opts.output, 'w') if opts.output else sys.stdout as out: - out.write('#define LIBC_EARLY_INIT_NAME {}\n'.format(name)) - out.write('#define LIBC_EARLY_INIT_NAME_STRING "{}"\n'.format(name)) - out.write('#define LIBC_EARLY_INIT_GNU_HASH {}\n'.format( - gnu_hash(name))) |