253 lines
9.0 KiB
Python
253 lines
9.0 KiB
Python
#!/usr/bin/python3
|
|
# Helpers for glibc system call list processing.
|
|
# Copyright (C) 2018-2022 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
|
|
# <http://www.gnu.org/licenses/>.
|
|
|
|
import os
|
|
import re
|
|
|
|
if __name__ != '__main__':
|
|
# When called as a main program, this is not needed.
|
|
import glibcextract
|
|
|
|
def extract_system_call_name(macro):
|
|
"""Convert the macro name (with __NR_) to a system call name."""
|
|
prefix = '__NR_'
|
|
if macro.startswith(prefix):
|
|
return macro[len(prefix):]
|
|
else:
|
|
raise ValueError('invalid system call name: {!r}'.format(macro))
|
|
|
|
# Matches macros for systme call names.
|
|
RE_SYSCALL = re.compile('__NR_.*')
|
|
|
|
# Some __NR_ constants are not real
|
|
RE_PSEUDO_SYSCALL = re.compile(r"""__NR_(
|
|
# Reserved system call.
|
|
(unused|reserved)[0-9]+
|
|
|
|
# Pseudo-system call which describes a range.
|
|
|(syscalls|arch_specific_syscall|(OABI_)?SYSCALL_BASE|SYSCALL_MASK)
|
|
|(|64_|[NO]32_)Linux(_syscalls)?
|
|
)""", re.X)
|
|
|
|
def kernel_constants(cc):
|
|
"""Return a dictionary with the kernel-defined system call numbers.
|
|
|
|
This comes from <asm/unistd.h>.
|
|
|
|
"""
|
|
return {extract_system_call_name(name) : int(value)
|
|
for name, value in glibcextract.compute_macro_consts(
|
|
'#include <asm/unistd.h>\n'
|
|
# Regularlize the kernel definitions if necessary.
|
|
'#include <fixup-asm-unistd.h>',
|
|
cc, macro_re=RE_SYSCALL, exclude_re=RE_PSEUDO_SYSCALL)
|
|
.items()}
|
|
|
|
class SyscallNamesList:
|
|
"""The list of known system call names.
|
|
|
|
glibc keeps a list of system call names. The <sys/syscall.h>
|
|
header needs to provide a SYS_ name for each __NR_ macro,
|
|
and the generated <bits/syscall.h> header uses an
|
|
architecture-independent list, so that there is a chance that
|
|
system calls arriving late on certain architectures will automatically
|
|
get the expected SYS_ macro.
|
|
|
|
syscalls: list of strings with system call names
|
|
kernel_version: tuple of integers; the kernel version given in the file
|
|
|
|
"""
|
|
def __init__(self, lines):
|
|
self.syscalls = []
|
|
old_name = None
|
|
self.kernel_version = None
|
|
self.__lines = tuple(lines)
|
|
for line in self.__lines:
|
|
line = line.strip()
|
|
if (not line) or line[0] == '#':
|
|
continue
|
|
comps = line.split()
|
|
if len(comps) == 1:
|
|
self.syscalls.append(comps[0])
|
|
if old_name is not None:
|
|
if comps[0] < old_name:
|
|
raise ValueError(
|
|
'name list is not sorted: {!r} < {!r}'.format(
|
|
comps[0], old_name))
|
|
old_name = comps[0]
|
|
continue
|
|
if len(comps) == 2 and comps[0] == "kernel":
|
|
if self.kernel_version is not None:
|
|
raise ValueError(
|
|
"multiple kernel versions: {!r} and !{r}".format(
|
|
kernel_version, comps[1]))
|
|
self.kernel_version = tuple(map(int, comps[1].split(".")))
|
|
continue
|
|
raise ValueError("invalid line: !r".format(line))
|
|
if self.kernel_version is None:
|
|
raise ValueError("missing kernel version")
|
|
|
|
def merge(self, names):
|
|
"""Merge sequence NAMES and return the lines of the new file."""
|
|
names = list(set(names) - set(self.syscalls))
|
|
names.sort()
|
|
names.reverse()
|
|
result = []
|
|
def emit_name():
|
|
result.append(names[-1] + "\n")
|
|
del names[-1]
|
|
|
|
for line in self.__lines:
|
|
comps = line.strip().split()
|
|
if len(comps) == 1 and not comps[0].startswith("#"):
|
|
# File has a system call at this position. Insert all
|
|
# the names that come before the name in the file
|
|
# lexicographically.
|
|
while names and names[-1] < comps[0]:
|
|
emit_name()
|
|
result.append(line)
|
|
while names:
|
|
emit_name()
|
|
|
|
return result
|
|
|
|
def load_arch_syscall_header(path):
|
|
""""Load the system call header form the file PATH.
|
|
|
|
The file must consist of lines of this form:
|
|
|
|
#define __NR_exit 1
|
|
|
|
The file is parsed verbatim, without running it through a C
|
|
preprocessor or parser. The intent is that the file can be
|
|
readily processed by tools.
|
|
|
|
"""
|
|
with open(path) as inp:
|
|
result = {}
|
|
old_name = None
|
|
for line in inp:
|
|
line = line.strip()
|
|
|
|
# Ignore the initial comment line.
|
|
if line.startswith("/*") and line.endswith("*/"):
|
|
continue
|
|
|
|
define, name, number = line.split(' ', 2)
|
|
if define != '#define':
|
|
raise ValueError("invalid syscall header line: {!r}".format(
|
|
line))
|
|
result[extract_system_call_name(name)] = int(number)
|
|
|
|
# Check list order.
|
|
if old_name is not None:
|
|
if name < old_name:
|
|
raise ValueError(
|
|
'system call list is not sorted: {!r} < {!r}'.format(
|
|
name, old_name))
|
|
old_name = name
|
|
return result
|
|
|
|
def linux_kernel_version(cc):
|
|
"""Return the (major, minor) version of the Linux kernel headers."""
|
|
sym_data = ['#include <linux/version.h>', 'START',
|
|
('LINUX_VERSION_CODE', 'LINUX_VERSION_CODE')]
|
|
val = glibcextract.compute_c_consts(sym_data, cc)['LINUX_VERSION_CODE']
|
|
val = int(val)
|
|
return ((val & 0xff0000) >> 16, (val & 0xff00) >> 8)
|
|
|
|
class ArchSyscall:
|
|
"""Canonical name and location of a syscall header."""
|
|
|
|
def __init__(self, name, path):
|
|
self.name = name
|
|
self.path = path
|
|
|
|
def __repr__(self):
|
|
return 'ArchSyscall(name={!r}, patch={!r})'.format(
|
|
self.name, self.path)
|
|
|
|
def list_arch_syscall_headers(topdir):
|
|
"""A generator which returns all the ArchSyscall objects in a tree."""
|
|
|
|
sysdeps = os.path.join(topdir, 'sysdeps', 'unix', 'sysv', 'linux')
|
|
for root, dirs, files in os.walk(sysdeps):
|
|
if root != sysdeps:
|
|
for filename in files:
|
|
if filename == 'arch-syscall.h':
|
|
yield ArchSyscall(
|
|
name=os.path.relpath(root, sysdeps),
|
|
path=os.path.join(root, filename))
|
|
|
|
def __main():
|
|
"""Entry point when called as the main program."""
|
|
|
|
import argparse
|
|
import sys
|
|
|
|
# Top-level directory of the source tree.
|
|
topdir = os.path.realpath(os.path.join(
|
|
os.path.dirname(os.path.realpath(__file__)), *('..',) * 4))
|
|
|
|
def get_parser():
|
|
parser = argparse.ArgumentParser(description=__doc__)
|
|
subparsers = parser.add_subparsers(dest='command', required=True)
|
|
subparsers.add_parser('list-headers',
|
|
help='Print the absolute paths of all arch-syscall.h header files')
|
|
subparser = subparsers.add_parser('query-syscall',
|
|
help='Summarize the implementation status of system calls')
|
|
subparser.add_argument('syscalls', help='Which syscalls to check',
|
|
nargs='+')
|
|
return parser
|
|
parser = get_parser()
|
|
args = parser.parse_args()
|
|
|
|
if args.command == 'list-headers':
|
|
for header in sorted([syscall.path for syscall
|
|
in list_arch_syscall_headers(topdir)]):
|
|
print(header)
|
|
|
|
elif args.command == 'query-syscall':
|
|
# List of system call tables.
|
|
tables = sorted(list_arch_syscall_headers(topdir),
|
|
key=lambda syscall: syscall.name)
|
|
for table in tables:
|
|
table.numbers = load_arch_syscall_header(table.path)
|
|
|
|
for nr in args.syscalls:
|
|
defined = [table.name for table in tables
|
|
if nr in table.numbers]
|
|
undefined = [table.name for table in tables
|
|
if nr not in table.numbers]
|
|
if not defined:
|
|
print('{}: not defined on any architecture'.format(nr))
|
|
elif not undefined:
|
|
print('{}: defined on all architectures'.format(nr))
|
|
else:
|
|
print('{}:'.format(nr))
|
|
print(' defined: {}'.format(' '.join(defined)))
|
|
print(' undefined: {}'.format(' '.join(undefined)))
|
|
|
|
else:
|
|
# Unrecognized command.
|
|
usage(1)
|
|
|
|
if __name__ == '__main__':
|
|
__main()
|