utils/load_sym_files.py

   1 # Copyright (c) 2013 Adrian Negreanu <groleo@gmail.com>
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>
  15
  16 import os
  17 import re
  18 import subprocess
  19
  20 class LoadSymFiles(gdb.Command):
  21     """Add symbol files for files in /proc/pid/maps:  load-sym-file [symbols-directory] [lib-directory]"""
  22     """Usage example:
  23         start           # breakpoint 1
  24         set confirm off
  25         b dlfcn.c:56    # breakpoint 2, android_dlopen
  26         commands 2      # commands to run when breakpoint 2 is hit
  27         source ../utils/load_sym_files.py
  28         load-sym-files
  29         continue
  30         end             # end of commands for bkpt 2
  31     """
  32     def __init__(self):
  33         gdb.Command.__init__(self, "load-sym-files", gdb.COMMAND_FILES, gdb.COMPLETE_FILENAME, True)
  34
  35     def invoke(self, arg, from_tty):
  36         arg_list = gdb.string_to_argv(arg)
  37         symdir = "/system/symbols"
  38         libdir = "/system/lib"
  39
  40         if len(arg_list) == 1:
  41             symdir = arg_list[0]
  42         if not os.path.isdir(symdir):
  43             print "error: invalid symbol directory(%s)"%symdir
  44             print "usage: load-sym-files [symbols-dir] [lib-dir]"
  45             return
  46
  47         if len(arg_list) == 2:
  48             libdir = arg_list[1]
  49         if not os.path.isdir(libdir):
  50             print "error: invalid library directory(%s)"%libdir
  51             print "usage: load-sym-files [symbols-dir] [lib-dir]"
  52             return
  53         try:
  54             pid = gdb.selected_inferior().pid
  55         except AttributeError:
  56             # in case gdb-version < 7.4
  57             # the array can have more than one element,
  58             # but it's good enough when debugging test_egl
  59             if len(gdb.inferiors()) == 1:
  60                 pid = gdb.inferiors()[0].pid
  61             else:
  62                 print "error: no gdb support for more than 1 inferior"
  63                 return
  64
  65         if pid == 0:
  66             print "error: debugee not started yet"
  67             return
  68
  69         maps = open("/proc/%d/maps"%pid,"rb")
  70         for line in maps:
  71             # b7fc9000-b7fcf000 r-xp 00000000 08:01 1311443    /system/lib/liblog.so
  72             m = re.match("([0-9A-Fa-f]+)-[0-9A-Fa-f]+\s+r-xp.*(%s.*)"%libdir,line)
  73             if not m:
  74                 continue
  75
  76             start_addr = int(m.group(1),16)
  77             lib        = m.group(2)
  78             text_addr  = 0
  79
  80             p = subprocess.Popen("objdump -h "+lib , shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
  81             for header in  p.stdout.read().split("\n"):
  82                 #6 .text         00044ef7  00017f80  00017f80  00017f80  2**4
  83                 t = re.match("\s*[0-9]+\s+\.text\s+([0-9A-Fa-f]+\s+){3}([0-9A-Fa-f]+)",header)
  84                 if t:
  85                     text_addr = int(t.group(2),16)
  86                     break
  87             symfile = symdir + lib
  88             if os.path.isfile(symfile):
  89                 gdb.execute("add-symbol-file %s 0x%X" % (symfile, start_addr+text_addr))
  90
  91
  92 LoadSymFiles()