1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Copyright 2019 Google LLC.
4
5 import gdb
6 import zlib
7
8 from linux import utils
9
10
11 class LxConfigDump(gdb.Command):
12 """Output kernel config to the filename specified as the command
13 argument. Equivalent to 'zcat /proc/config.gz > config.txt' on
14 a running target"""
15
16 def __init__(self):
17 super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
18 gdb.COMPLETE_FILENAME)
19
20 def invoke(self, arg, from_tty):
21 if len(arg) == 0:
22 filename = "config.txt"
23 else:
24 filename = arg
25
26 try:
27 py_config_ptr = gdb.parse_and_eval("&kernel_config_data")
28 py_config_ptr_end = gdb.parse_and_eval("&kernel_config_data_end")
29 py_config_size = py_config_ptr_end - py_config_ptr
30 except gdb.error as e:
31 raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
32
33 inf = gdb.inferiors()[0]
34 zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
35 py_config_size).tobytes()
36
37 config_buf = zlib.decompress(zconfig_buf, 16)
38 with open(filename, 'wb') as f:
39 f.write(config_buf)
40
41 gdb.write("Dumped config to " + filename + "\n")
42
43
44 LxConfigDump()
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