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#!/usr/bin/env python3
import sys
import os
'''
generate fake __NR_xxxx constants for syscalls not defined in the current arch
so that code like:
if (... == __NR_xxxx)
or
switch (...) {
case __NR_xxxx
is just skipped. No arch #ifdef are required.
'''
__NR__first = 1000000000
if len(sys.argv) < 2 or not os.path.isfile(sys.argv[1]):
print(f"{sys.argv[0]}: the input should be 'vu_syscalls.conf'")
sys.exit(1)
# Parse and output
def acceptable(string):
if string.startswith('#') or \
string.startswith('-') or \
string.startswith('null') or \
string.startswith('BUILTIN'):
return False
else:
return True
def get_syscall_names(string):
syscall_list = []
s = string.rpartition(':')
if ':' == s[1]:
seq = s[0].split(', ')
for syscall in seq:
parts = syscall.rpartition('/')
if parts[1] == '/':
syscall_list.append(parts[0])
else:
syscall_list.append(parts[2])
return syscall_list
syscall_list = []
with open(sys.argv[1]) as f:
for line in f:
if acceptable(line):
syscall_list += get_syscall_names(line)
print('''#ifndef __SYSCALL_NR_COMPAT_H
#define __SYSCALL_NR_COMPAT_H
/* Generate compat __NR for missing system calls */
''')
for syscall_nr,syscall_def in enumerate(syscall_list, start = __NR__first):
print(f'''#ifndef __NR_{syscall_def}
# define __NR_{syscall_def} {syscall_nr}
#endif\n''')
print(f'#define __NR__first {__NR__first}')
print(f'#define __NR__last {__NR__first + len(syscall_list) - 1}')
print('#define __NR__is_unsupp(X) ((X) >= __NR__first && (X) <= __NR__last)');
print('\n\n#endif')
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