addrfilt

   1 #!/usr/bin/python
   2
   3 import sys, re, os.path
   4 import subprocess
   5 from optparse import OptionParser
   6
   7 class Addr2line:
   8     def __init__(self, vmlinux, prefix = ''):
   9         self.a2l = subprocess.Popen(['addr2line', '-fe', vmlinux],
  10                                     stdin = subprocess.PIPE,
  11                                     stdout = subprocess.PIPE,
  12                                     stderr = subprocess.PIPE,
  13                                     close_fds = True)
  14         self.prefix = prefix
  15         self.cache = dict()
  16     def resolve(self, addr):
  17         self.a2l.stdin.write('%08x\n' % addr)
  18         symbol = self.a2l.stdout.readline().strip()
  19         file = self.a2l.stdout.readline().strip()
  20         if symbol == '??':
  21             return None
  22         if file.startswith(self.prefix):
  23             file = file[len(self.prefix):]
  24         return (symbol, file)
  25
  26 class MultiResolver:
  27     def __init__(self, resolvers):
  28         self.resolvers = resolvers
  29     def resolve(self, addr):
  30         for resolver in self.resolvers:
  31             ret = resolver.resolve(addr)
  32             if ret:
  33                 return ret
  34
  35 class Cache:
  36     def __init__(self, resolver):
  37         self.resolver = resolver
  38         self.cache = dict()
  39     def resolve(self, addr):
  40         if not self.cache.has_key(addr):
  41             self.cache[addr] = self.resolver.resolve(addr)
  42         return self.cache[addr]
  43
  44 optparser = OptionParser()
  45 optparser.add_option('-g', '--guest', dest='guest', action='store_true',
  46                      default=True,
  47                      help='interpret kernel addresses as guest (default)')
  48 optparser.add_option('-H', '--host', dest='guest', action='store_false',
  49                      help='interpret kernel addresses as host')
  50 (options, args) = optparser.parse_args()
  51
  52 basedir = os.getcwd()
  53 basedir = re.sub(r'(.*/kvm)(/.*)', r'\1', basedir)
  54
  55 addr_re = re.compile(r'\b[0-9a-fA-F]{8,16}\b')
  56 if options.guest:
  57     linux = Addr2line(basedir + '/qemu/vmlinux',
  58                       basedir + '/qemu/linux/')
  59 else:
  60     linux = Addr2line(basedir + '/kernel/vmlinux',
  61                       basedir + '/kernel/linux/')
  62 addr2line = Cache(linux)
  63
  64 def expand_addr(addr):
  65     addr = addr.group(0)
  66     result = addr2line.resolve(int(addr, 16))
  67     if result:
  68         (symbol, file) = result
  69         return '%s %s(%s)' % (addr, symbol, file)
  70     else:
  71         return addr
  72
  73 try:
  74     for line in sys.stdin:
  75         line = addr_re.sub(expand_addr, line)
  76         print line,
  77 except KeyboardInterrupt:
  78     sys.exit()
  79