src/openpower/syscalls/ppc_flags.py

   1 # SPDX-License-Identifier: LGPLv3+
   2 # Copyright (C) 2023 Jacob Lifshay <programmerjake@gmail.com>
   3 # Funded by NLnet http://nlnet.nl
   4 """ flags for PowerPC syscalls
   5
   6 related bugs:
   7
   8 * https://bugs.libre-soc.org/show_bug.cgi?id=1169
   9 """
  10
  11 def parse_defines(flags, compiler):
  12     """ parse `#define`s into the dict `flags` using the given `compiler`
  13     """
  14     from subprocess import run, PIPE
  15     inp = """
  16 #include <sys/mman.h>
  17 #include <errno.h>
  18 #include <unistd.h>
  19 #include <sys/syscall.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <linux/utsname.h>
  24 #include <linux/auxvec.h>
  25 #include <sys/auxv.h>
  26 """
  27     if isinstance(compiler, str):
  28         compiler = [compiler]
  29     out = run([*compiler, '-E', '-dM', '-'], input=inp,
  30               check=True, stdout=PIPE, encoding='utf-8').stdout
  31     def_start = '#define '
  32     defines = {}
  33     for define in out.splitlines():
  34         assert define.startswith(def_start)
  35         define = define[len(def_start):]
  36         name, space, value = define.partition(' ')
  37         assert space == ' '
  38         if not name.isidentifier():
  39             continue
  40         defines[name] = value
  41     # resolve things defined in terms of other things
  42     more_substitutions = True
  43     while more_substitutions:
  44         more_substitutions = False
  45         for name, value in defines.items():
  46             new_value = defines.get(value)
  47             if new_value is not None and new_value != value:
  48                 defines[name] = new_value
  49                 more_substitutions = True
  50     for name, value in defines.items():
  51         if value.startswith('(') and value.endswith(')'):
  52             value = value[1:-2]
  53         if len(value) > 1 and value.startswith('0') and value[1].isdigit():
  54             value = '0o' + value[1:]
  55         try:
  56             flags[name] = int(value, 0)
  57         except ValueError:
  58             pass
  59     return flags
  60
  61 parse_defines(globals(), 'powerpc64le-linux-gnu-gcc')
  62
  63 def _host_defines():
  64     import sysconfig
  65     return parse_defines({}, sysconfig.get_config_var('CC').split(' '))
  66
  67 host_defines = _host_defines()
  68 del _host_defines