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#!/usr/bin/python3
# Helpers for glibc system call list processing.
# Copyright (C) 2018-2020 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 re
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)
|(|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)
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