1 # SPDX-License-Identifier: GPL-2.0
3 # Copyright 2019 Google LLC.
8 from linux import utils
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
17 super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
18 gdb.COMPLETE_FILENAME)
20 def invoke(self, arg, from_tty):
22 filename = "config.txt"
27 py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
28 py_config_size = gdb.parse_and_eval(
29 "sizeof(kernel_config_data) - 1 - 8 * 2")
30 except gdb.error as e:
31 raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
33 inf = gdb.inferiors()[0]
34 zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
35 py_config_size).tobytes()
37 config_buf = zlib.decompress(zconfig_buf, 16)
38 with open(filename, 'wb') as f:
41 gdb.write("Dumped config to " + filename + "\n")