1 #!/usr/bin/env python 2 #===- lib/dfsan/scripts/build-libc-list.py ---------------------------------===# 3 # 4 # The LLVM Compiler Infrastructure 5 # 6 # This file is distributed under the University of Illinois Open Source 7 # License. See LICENSE.TXT for details. 8 # 9 #===------------------------------------------------------------------------===# 10 # The purpose of this script is to identify every function symbol in a set of 11 # libraries (in this case, libc and libgcc) so that they can be marked as 12 # uninstrumented, thus allowing the instrumentation pass to treat calls to those 13 # functions correctly. 14 15 import os 16 import subprocess 17 import sys 18 from optparse import OptionParser 19 20 def defined_function_list(object): 21 functions = [] 22 readelf_proc = subprocess.Popen(['readelf', '-s', '-W', object], 23 stdout=subprocess.PIPE) 24 readelf = readelf_proc.communicate()[0].split('\n') 25 if readelf_proc.returncode != 0: 26 raise subprocess.CalledProcessError(readelf_proc.returncode, 'readelf') 27 for line in readelf: 28 if (line[31:35] == 'FUNC' or line[31:36] == 'IFUNC') and \ 29 line[39:44] != 'LOCAL' and \ 30 line[55:58] != 'UND': 31 function_name = line[59:].split('@')[0] 32 functions.append(function_name) 33 return functions 34 35 p = OptionParser() 36 37 p.add_option('--libc-dso-path', metavar='PATH', 38 help='path to libc DSO directory', 39 default='/lib/x86_64-linux-gnu') 40 p.add_option('--libc-archive-path', metavar='PATH', 41 help='path to libc archive directory', 42 default='/usr/lib/x86_64-linux-gnu') 43 44 p.add_option('--libgcc-dso-path', metavar='PATH', 45 help='path to libgcc DSO directory', 46 default='/lib/x86_64-linux-gnu') 47 p.add_option('--libgcc-archive-path', metavar='PATH', 48 help='path to libgcc archive directory', 49 default='/usr/lib/gcc/x86_64-linux-gnu/4.6') 50 51 p.add_option('--with-libstdcxx', action='store_true', 52 dest='with_libstdcxx', 53 help='include libstdc++ in the list (inadvisable)') 54 p.add_option('--libstdcxx-dso-path', metavar='PATH', 55 help='path to libstdc++ DSO directory', 56 default='/usr/lib/x86_64-linux-gnu') 57 58 (options, args) = p.parse_args() 59 60 libs = [os.path.join(options.libc_dso_path, name) for name in 61 ['ld-linux-x86-64.so.2', 62 'libanl.so.1', 63 'libBrokenLocale.so.1', 64 'libcidn.so.1', 65 'libcrypt.so.1', 66 'libc.so.6', 67 'libdl.so.2', 68 'libm.so.6', 69 'libnsl.so.1', 70 'libpthread.so.0', 71 'libresolv.so.2', 72 'librt.so.1', 73 'libthread_db.so.1', 74 'libutil.so.1']] 75 libs += [os.path.join(options.libc_archive_path, name) for name in 76 ['libc_nonshared.a', 77 'libpthread_nonshared.a']] 78 79 libs.append(os.path.join(options.libgcc_dso_path, 'libgcc_s.so.1')) 80 libs.append(os.path.join(options.libgcc_archive_path, 'libgcc.a')) 81 82 if options.with_libstdcxx: 83 libs.append(os.path.join(options.libstdcxx_dso_path, 'libstdc++.so.6')) 84 85 functions = [] 86 for l in libs: 87 if os.path.exists(l): 88 functions += defined_function_list(l) 89 else: 90 print >> sys.stderr, 'warning: library %s not found' % l 91 92 functions = list(set(functions)) 93 functions.sort() 94 95 for f in functions: 96 print 'fun:%s=uninstrumented' % f 97
