2 # gdb helper commands and functions for Linux kernel debugging
4 # kernel log buffer dump
6 # Copyright (c) Siemens AG, 2011, 2012
9 # Jan Kiszka <jan.kiszka@siemens.com>
11 # This work is licensed under the terms of the GNU GPL version 2.
16 from linux
import utils
19 class LxDmesg(gdb
.Command
):
20 """Print Linux kernel log buffer."""
23 super(LxDmesg
, self
).__init
__("lx-dmesg", gdb
.COMMAND_DATA
)
25 def invoke(self
, arg
, from_tty
):
26 log_buf_addr
= int(str(gdb
.parse_and_eval("log_buf")).split()[0], 16)
27 log_first_idx
= int(gdb
.parse_and_eval("log_first_idx"))
28 log_next_idx
= int(gdb
.parse_and_eval("log_next_idx"))
29 log_buf_len
= int(gdb
.parse_and_eval("log_buf_len"))
31 inf
= gdb
.inferiors()[0]
32 start
= log_buf_addr
+ log_first_idx
33 if log_first_idx
< log_next_idx
:
35 length
= log_next_idx
- log_first_idx
36 log_buf
= utils
.read_memoryview(inf
, start
, length
).tobytes()
38 log_buf_2nd_half
= log_buf_len
- log_first_idx
39 a
= utils
.read_memoryview(inf
, start
, log_buf_2nd_half
)
40 b
= utils
.read_memoryview(inf
, log_buf_addr
, log_next_idx
)
41 log_buf
= a
.tobytes() + b
.tobytes()
44 while pos
< log_buf
.__len
__():
45 length
= utils
.read_u16(log_buf
[pos
+ 8:pos
+ 10])
47 if log_buf_2nd_half
== -1:
48 gdb
.write("Corrupted log buffer!\n")
50 pos
= log_buf_2nd_half
53 text_len
= utils
.read_u16(log_buf
[pos
+ 10:pos
+ 12])
54 text
= log_buf
[pos
+ 16:pos
+ 16 + text_len
].decode()
55 time_stamp
= utils
.read_u64(log_buf
[pos
:pos
+ 8])
57 for line
in text
.splitlines():
58 gdb
.write("[{time:12.6f}] {line}\n".format(
59 time
=time_stamp
/ 1000000000.0,
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