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# SPDX-License-Identifier: GPL-2.0
#
# Copyright 2019 Google LLC.
import gdb
import zlib
from linux import utils
class LxConfigDump(gdb.Command):
"""Output kernel config to the filename specified as the command
argument. Equivalent to 'zcat /proc/config.gz > config.txt' on
a running target"""
def __init__(self):
super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
gdb.COMPLETE_FILENAME)
def invoke(self, arg, from_tty):
if len(arg) == 0:
filename = "config.txt"
else:
filename = arg
try:
py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
py_config_size = gdb.parse_and_eval(
"sizeof(kernel_config_data) - 1 - 8 * 2")
except gdb.error as e:
raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
inf = gdb.inferiors()[0]
zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
py_config_size).tobytes()
config_buf = zlib.decompress(zconfig_buf, 16)
with open(filename, 'wb') as f:
f.write(config_buf)
gdb.write("Dumped config to " + filename + "\n")
LxConfigDump()
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