1# SPDX-License-Identifier: GPL-2.0 2# 3# Copyright 2019 Google LLC. 4 5import gdb 6import zlib 7 8from linux import utils 9 10 11class 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 + 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?") 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 44LxConfigDump() 45