src/basic/missing_syscalls.py

   1 #!/usr/bin/env python3
   2 # SPDX-License-Identifier: LGPL-2.1-or-later
   3
   4 import sys
   5 import functools
   6
   7 # We only generate numbers for a dozen or so syscalls
   8 SYSCALLS = [
   9     'bpf',
  10     'close_range',
  11     'copy_file_range',
  12     'getrandom',
  13     'memfd_create',
  14     'name_to_handle_at',
  15     'pidfd_open',
  16     'pidfd_send_signal',
  17     'pkey_mprotect',
  18     'renameat2',
  19     'setns',
  20     'statx']
  21
  22 def dictify(f):
  23     def wrap(*args, **kwargs):
  24         return dict(f(*args, **kwargs))
  25     return functools.update_wrapper(wrap, f)
  26
  27 @dictify
  28 def parse_syscall_table(filename):
  29     print(f'Reading {filename}…')
  30     for line in open(filename):
  31         items = line.split()
  32         if len(items) >= 2:
  33             yield items[0], int(items[1])
  34
  35 def parse_syscall_tables(filenames):
  36     return {filename.split('-')[-1][:-4]: parse_syscall_table(filename)
  37             for filename in filenames}
  38
  39 DEF_TEMPLATE = '''\
  40 #ifndef __IGNORE_{syscall}
  41 #  if defined(__aarch64__)
  42 #    define systemd_NR_{syscall} {nr_arm64}
  43 #  elif defined(__alpha__)
  44 #    define systemd_NR_{syscall} {nr_alpha}
  45 #  elif defined(__arc__) || defined(__tilegx__)
  46 #    define systemd_NR_{syscall} {nr_arc}
  47 #  elif defined(__arm__)
  48 #    define systemd_NR_{syscall} {nr_arm}
  49 #  elif defined(__i386__)
  50 #    define systemd_NR_{syscall} {nr_i386}
  51 #  elif defined(__ia64__)
  52 #    define systemd_NR_{syscall} {nr_ia64}
  53 #  elif defined(__m68k__)
  54 #    define systemd_NR_{syscall} {nr_m68k}
  55 #  elif defined(_MIPS_SIM)
  56 #    if _MIPS_SIM == _MIPS_SIM_ABI32
  57 #      define systemd_NR_{syscall} {nr_mipso32}
  58 #    elif _MIPS_SIM == _MIPS_SIM_NABI32
  59 #      define systemd_NR_{syscall} {nr_mips64n32}
  60 #    elif _MIPS_SIM == _MIPS_SIM_ABI64
  61 #      define systemd_NR_{syscall} {nr_mips64}
  62 #    else
  63 #      error "Unknown MIPS ABI"
  64 #    endif
  65 #  elif defined(__powerpc__)
  66 #    define systemd_NR_{syscall} {nr_powerpc}
  67 #  elif defined(__s390__)
  68 #    define systemd_NR_{syscall} {nr_s390}
  69 #  elif defined(__sparc__)
  70 #    define systemd_NR_{syscall} {nr_sparc}
  71 #  elif defined(__x86_64__)
  72 #    if defined(__ILP32__)
  73 #      define systemd_NR_{syscall} ({nr_x86_64} | /* __X32_SYSCALL_BIT */ 0x40000000)
  74 #    else
  75 #      define systemd_NR_{syscall} {nr_x86_64}
  76 #    endif
  77 #  else
  78 #    warning "{syscall}() syscall number is unknown for your architecture"
  79 #  endif
  80
  81 /* may be an (invalid) negative number due to libseccomp, see PR 13319 */
  82 #  if defined __NR_{syscall} && __NR_{syscall} >= 0
  83 #    if defined systemd_NR_{syscall}
  84 assert_cc(__NR_{syscall} == systemd_NR_{syscall});
  85 #    endif
  86 #  else
  87 #    if defined __NR_{syscall}
  88 #      undef __NR_{syscall}
  89 #    endif
  90 #    if defined systemd_NR_{syscall} && systemd_NR_{syscall} >= 0
  91 #      define __NR_{syscall} systemd_NR_{syscall}
  92 #    endif
  93 #  endif
  94 #endif
  95 '''
  96
  97 def print_syscall_def(syscall, tables, out):
  98     mappings = {f'nr_{arch}':t.get(syscall, -1)
  99                 for arch, t in tables.items()}
 100     print(DEF_TEMPLATE.format(syscall=syscall, **mappings),
 101           file=out)
 102
 103 def print_syscall_defs(syscalls, tables, out):
 104     print('''\
 105 /* SPDX-License-Identifier: LGPL-2.1-or-later
 106  * This file is generated. Do not edit! */
 107 ''' , file=out)
 108     for syscall in syscalls:
 109         print_syscall_def(syscall, tables, out)
 110
 111 if __name__ == '__main__':
 112     output_file = sys.argv[1]
 113     arch_files = sys.argv[2:]
 114     out = open(output_file, 'wt')
 115
 116     tables = parse_syscall_tables(arch_files)
 117     print_syscall_defs(SYSCALLS, tables, out)
 118
 119     print(f'Wrote {output_file}')