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 """
  26     if isinstance(compiler, str):
  27         compiler = [compiler]
  28     out = run([*compiler, '-E', '-dM', '-'], input=inp,
  29               check=True, stdout=PIPE, encoding='utf-8').stdout
  30     def_start = '#define '
  31     defines = {}
  32     for define in out.splitlines():
  33         assert define.startswith(def_start)
  34         define = define[len(def_start):]
  35         name, space, value = define.partition(' ')
  36         assert space == ' '
  37         if not name.isidentifier():
  38             continue
  39         defines[name] = value
  40     # resolve things defined in terms of other things
  41     more_substitutions = True
  42     while more_substitutions:
  43         more_substitutions = False
  44         for name, value in defines.items():
  45             new_value = defines.get(value)
  46             if new_value is not None and new_value != value:
  47                 defines[name] = new_value
  48                 more_substitutions = True
  49     for name, value in defines.items():
  50         if value.startswith('(') and value.endswith(')'):
  51             value = value[1:-2]
  52         if len(value) > 1 and value.startswith('0') and value[1].isdigit():
  53             value = '0o' + value[1:]
  54         try:
  55             flags[name] = int(value, 0)
  56         except ValueError:
  57             pass
  58     return flags
  59
  60 parse_defines(globals(), 'powerpc64le-linux-gnu-gcc')
  61
  62 def _host_defines():
  63     import sysconfig
  64     return parse_defines({}, sysconfig.get_config_var('CC').split(' '))
  65
  66 host_defines = _host_defines()
  67 del _host_defines