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.
17 from linux
import utils
20 class LxDmesg(gdb
.Command
):
21 """Print Linux kernel log buffer."""
24 super(LxDmesg
, self
).__init
__("lx-dmesg", gdb
.COMMAND_DATA
)
26 def invoke(self
, arg
, from_tty
):
27 log_buf_addr
= int(str(gdb
.parse_and_eval("log_buf")).split()[0], 16)
28 log_first_idx
= int(gdb
.parse_and_eval("log_first_idx"))
29 log_next_idx
= int(gdb
.parse_and_eval("log_next_idx"))
30 log_buf_len
= int(gdb
.parse_and_eval("log_buf_len"))
32 inf
= gdb
.inferiors()[0]
33 start
= log_buf_addr
+ log_first_idx
34 if log_first_idx
< log_next_idx
:
36 length
= log_next_idx
- log_first_idx
37 log_buf
= inf
.read_memory(start
, length
)
39 log_buf_2nd_half
= log_buf_len
- log_first_idx
40 log_buf
= inf
.read_memory(start
, log_buf_2nd_half
) + \
41 inf
.read_memory(log_buf_addr
, log_next_idx
)
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
]
55 time_stamp
= utils
.read_u64(log_buf
[pos
:pos
+ 8])
57 for line
in memoryview(text
).tobytes().splitlines():
58 gdb
.write("[{time:12.6f}] {line}\n".format(
59 time
=time_stamp
/ 1000000000.0,
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