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253 lines
9.0 KiB
Python
253 lines
9.0 KiB
Python
#!/usr/bin/python3
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# Helpers for glibc system call list processing.
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# Copyright (C) 2018-2025 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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import os
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import re
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if __name__ != '__main__':
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# When called as a main program, this is not needed.
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import glibcextract
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def extract_system_call_name(macro):
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"""Convert the macro name (with __NR_) to a system call name."""
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prefix = '__NR_'
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if macro.startswith(prefix):
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return macro[len(prefix):]
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else:
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raise ValueError('invalid system call name: {!r}'.format(macro))
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# Matches macros for system call names.
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RE_SYSCALL = re.compile('__NR_.*')
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# Some __NR_ constants are not real
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RE_PSEUDO_SYSCALL = re.compile(r"""__NR_(
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# Reserved system call.
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(unused|reserved)[0-9]+
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# Pseudo-system call which describes a range.
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|(syscalls|arch_specific_syscall|(OABI_)?SYSCALL_BASE|SYSCALL_MASK)
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|(|64_|[NO]32_)Linux(_syscalls)?
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)""", re.X)
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def kernel_constants(cc):
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"""Return a dictionary with the kernel-defined system call numbers.
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This comes from <asm/unistd.h>.
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"""
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return {extract_system_call_name(name) : int(value)
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for name, value in glibcextract.compute_macro_consts(
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'#include <asm/unistd.h>\n'
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# Regularize the kernel definitions if necessary.
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'#include <fixup-asm-unistd.h>',
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cc, macro_re=RE_SYSCALL, exclude_re=RE_PSEUDO_SYSCALL)
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.items()}
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class SyscallNamesList:
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"""The list of known system call names.
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glibc keeps a list of system call names. The <sys/syscall.h>
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header needs to provide a SYS_ name for each __NR_ macro,
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and the generated <bits/syscall.h> header uses an
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architecture-independent list, so that there is a chance that
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system calls arriving late on certain architectures will automatically
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get the expected SYS_ macro.
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syscalls: list of strings with system call names
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kernel_version: tuple of integers; the kernel version given in the file
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"""
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def __init__(self, lines):
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self.syscalls = []
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old_name = None
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self.kernel_version = None
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self.__lines = tuple(lines)
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for line in self.__lines:
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line = line.strip()
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if (not line) or line[0] == '#':
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continue
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comps = line.split()
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if len(comps) == 1:
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self.syscalls.append(comps[0])
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if old_name is not None:
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if comps[0] < old_name:
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raise ValueError(
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'name list is not sorted: {!r} < {!r}'.format(
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comps[0], old_name))
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old_name = comps[0]
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continue
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if len(comps) == 2 and comps[0] == "kernel":
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if self.kernel_version is not None:
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raise ValueError(
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"multiple kernel versions: {!r} and !{r}".format(
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kernel_version, comps[1]))
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self.kernel_version = tuple(map(int, comps[1].split(".")))
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continue
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raise ValueError("invalid line: !r".format(line))
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if self.kernel_version is None:
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raise ValueError("missing kernel version")
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def merge(self, names):
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"""Merge sequence NAMES and return the lines of the new file."""
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names = list(set(names) - set(self.syscalls))
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names.sort()
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names.reverse()
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result = []
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def emit_name():
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result.append(names[-1] + "\n")
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del names[-1]
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for line in self.__lines:
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comps = line.strip().split()
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if len(comps) == 1 and not comps[0].startswith("#"):
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# File has a system call at this position. Insert all
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# the names that come before the name in the file
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# lexicographically.
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while names and names[-1] < comps[0]:
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emit_name()
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result.append(line)
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while names:
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emit_name()
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return result
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def load_arch_syscall_header(path):
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""""Load the system call header form the file PATH.
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The file must consist of lines of this form:
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#define __NR_exit 1
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The file is parsed verbatim, without running it through a C
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preprocessor or parser. The intent is that the file can be
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readily processed by tools.
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"""
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with open(path) as inp:
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result = {}
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old_name = None
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for line in inp:
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line = line.strip()
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# Ignore the initial comment line.
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if line.startswith("/*") and line.endswith("*/"):
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continue
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define, name, number = line.split(' ', 2)
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if define != '#define':
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raise ValueError("invalid syscall header line: {!r}".format(
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line))
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result[extract_system_call_name(name)] = int(number)
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# Check list order.
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if old_name is not None:
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if name < old_name:
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raise ValueError(
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'system call list is not sorted: {!r} < {!r}'.format(
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name, old_name))
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old_name = name
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return result
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def linux_kernel_version(cc):
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"""Return the (major, minor) version of the Linux kernel headers."""
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sym_data = ['#include <linux/version.h>', 'START',
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('LINUX_VERSION_CODE', 'LINUX_VERSION_CODE')]
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val = glibcextract.compute_c_consts(sym_data, cc)['LINUX_VERSION_CODE']
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val = int(val)
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return ((val & 0xff0000) >> 16, (val & 0xff00) >> 8)
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class ArchSyscall:
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"""Canonical name and location of a syscall header."""
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def __init__(self, name, path):
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self.name = name
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self.path = path
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def __repr__(self):
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return 'ArchSyscall(name={!r}, patch={!r})'.format(
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self.name, self.path)
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def list_arch_syscall_headers(topdir):
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"""A generator which returns all the ArchSyscall objects in a tree."""
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sysdeps = os.path.join(topdir, 'sysdeps', 'unix', 'sysv', 'linux')
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for root, dirs, files in os.walk(sysdeps):
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if root != sysdeps:
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for filename in files:
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if filename == 'arch-syscall.h':
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yield ArchSyscall(
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name=os.path.relpath(root, sysdeps),
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path=os.path.join(root, filename))
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def __main():
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"""Entry point when called as the main program."""
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import argparse
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import sys
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# Top-level directory of the source tree.
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topdir = os.path.realpath(os.path.join(
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os.path.dirname(os.path.realpath(__file__)), *('..',) * 4))
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def get_parser():
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parser = argparse.ArgumentParser(description=__doc__)
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subparsers = parser.add_subparsers(dest='command', required=True)
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subparsers.add_parser('list-headers',
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help='Print the absolute paths of all arch-syscall.h header files')
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subparser = subparsers.add_parser('query-syscall',
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help='Summarize the implementation status of system calls')
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subparser.add_argument('syscalls', help='Which syscalls to check',
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nargs='+')
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return parser
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parser = get_parser()
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args = parser.parse_args()
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if args.command == 'list-headers':
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for header in sorted([syscall.path for syscall
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in list_arch_syscall_headers(topdir)]):
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print(header)
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elif args.command == 'query-syscall':
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# List of system call tables.
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tables = sorted(list_arch_syscall_headers(topdir),
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key=lambda syscall: syscall.name)
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for table in tables:
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table.numbers = load_arch_syscall_header(table.path)
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for nr in args.syscalls:
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defined = [table.name for table in tables
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if nr in table.numbers]
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undefined = [table.name for table in tables
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if nr not in table.numbers]
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if not defined:
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print('{}: not defined on any architecture'.format(nr))
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elif not undefined:
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print('{}: defined on all architectures'.format(nr))
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else:
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print('{}:'.format(nr))
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print(' defined: {}'.format(' '.join(defined)))
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print(' undefined: {}'.format(' '.join(undefined)))
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else:
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# Unrecognized command.
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usage(1)
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if __name__ == '__main__':
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__main()
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