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