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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later
import sys
import functools
# We only generate numbers for a dozen or so syscalls
SYSCALLS = [
'bpf',
'close_range',
'copy_file_range',
'epoll_pwait2',
'fchmodat2',
'getrandom',
'memfd_create',
'mount_setattr',
'move_mount',
'name_to_handle_at',
'open_tree',
'openat2',
'pidfd_open',
'pidfd_send_signal',
'pkey_mprotect',
'renameat2',
'setns',
'statx',
]
def dictify(f):
def wrap(*args, **kwargs):
return dict(f(*args, **kwargs))
return functools.update_wrapper(wrap, f)
@dictify
def parse_syscall_table(filename):
print(f'Reading {filename}…')
for line in open(filename):
items = line.split()
if len(items) >= 2:
yield items[0], int(items[1])
def parse_syscall_tables(filenames):
return {filename.split('-')[-1][:-4]: parse_syscall_table(filename)
for filename in filenames}
DEF_TEMPLATE_A = '''\
#ifndef __IGNORE_{syscall}
'''
DEF_TEMPLATE_B = '''\
# if defined(__aarch64__)
# define systemd_NR_{syscall} {nr_arm64}
# elif defined(__alpha__)
# define systemd_NR_{syscall} {nr_alpha}
# elif defined(__arc__) || defined(__tilegx__)
# define systemd_NR_{syscall} {nr_arc}
# elif defined(__arm__)
# define systemd_NR_{syscall} {nr_arm}
# elif defined(__i386__)
# define systemd_NR_{syscall} {nr_i386}
# elif defined(__ia64__)
# define systemd_NR_{syscall} {nr_ia64}
# elif defined(__loongarch_lp64)
# define systemd_NR_{syscall} {nr_loongarch64}
# elif defined(__m68k__)
# define systemd_NR_{syscall} {nr_m68k}
# elif defined(_MIPS_SIM)
# if _MIPS_SIM == _MIPS_SIM_ABI32
# define systemd_NR_{syscall} {nr_mipso32}
# elif _MIPS_SIM == _MIPS_SIM_NABI32
# define systemd_NR_{syscall} {nr_mips64n32}
# elif _MIPS_SIM == _MIPS_SIM_ABI64
# define systemd_NR_{syscall} {nr_mips64}
# else
# error "Unknown MIPS ABI"
# endif
# elif defined(__hppa__)
# define systemd_NR_{syscall} {nr_parisc}
# elif defined(__powerpc__)
# define systemd_NR_{syscall} {nr_powerpc}
# elif defined(__riscv)
# if __riscv_xlen == 32
# define systemd_NR_{syscall} {nr_riscv32}
# elif __riscv_xlen == 64
# define systemd_NR_{syscall} {nr_riscv64}
# else
# error "Unknown RISC-V ABI"
# endif
# elif defined(__s390__)
# define systemd_NR_{syscall} {nr_s390}
# elif defined(__sparc__)
# define systemd_NR_{syscall} {nr_sparc}
# elif defined(__x86_64__)
# if defined(__ILP32__)
# define systemd_NR_{syscall} ({nr_x86_64} | /* __X32_SYSCALL_BIT */ 0x40000000)
# else
# define systemd_NR_{syscall} {nr_x86_64}
# endif
# elif !defined(missing_arch_template)
%s
# endif
'''
DEF_TEMPLATE_C = '''\
/* may be an (invalid) negative number due to libseccomp, see PR 13319 */
# if defined __NR_{syscall} && __NR_{syscall} >= 0
# if defined systemd_NR_{syscall}
assert_cc(__NR_{syscall} == systemd_NR_{syscall});
# endif
# else
# if defined __NR_{syscall}
# undef __NR_{syscall}
# endif
# if defined systemd_NR_{syscall} && systemd_NR_{syscall} >= 0
# define __NR_{syscall} systemd_NR_{syscall}
# endif
# endif
#endif'''
DEF_TEMPLATE = (DEF_TEMPLATE_A +
DEF_TEMPLATE_B % '# warning "{syscall}() syscall number is unknown for your architecture"' +
DEF_TEMPLATE_C)
ARCH_CHECK = '''\
/* Note: if this code looks strange, this is because it is derived from the same
* template as the per-syscall blocks below. */
''' + '\n'.join(line for line in DEF_TEMPLATE_B.splitlines()
if ' define ' not in line) % '''\
# warning "Current architecture is missing from the template"
# define missing_arch_template 1'''
def print_syscall_def(syscall, tables, out):
mappings = {f'nr_{arch}':t.get(syscall, -1)
for arch, t in tables.items()}
print(DEF_TEMPLATE.format(syscall=syscall, **mappings),
file=out)
def print_syscall_defs(syscalls, tables, out):
print('''\
/* SPDX-License-Identifier: LGPL-2.1-or-later
* This file is generated by src/basic/missing_syscalls.py. Do not edit!
*
* Use 'ninja -C build update-syscall-tables' to download new syscall tables,
* and 'ninja -C build update-syscall-header' to regenerate this file.
*/
#pragma once
''',
file=out)
print(ARCH_CHECK, file=out)
for syscall in syscalls:
print_syscall_def(syscall, tables, out)
if __name__ == '__main__':
output_file = sys.argv[1]
arch_files = sys.argv[2:]
out = open(output_file, 'wt')
tables = parse_syscall_tables(arch_files)
print_syscall_defs(SYSCALLS, tables, out)
print(f'Wrote {output_file}')
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