src/basic/missing_syscalls.py

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