| # |
| # gdb helper commands and functions for Linux kernel debugging |
| # |
| # kernel log buffer dump |
| # |
| # Copyright (c) Siemens AG, 2011, 2012 |
| # |
| # Authors: |
| # Jan Kiszka <jan.kiszka@siemens.com> |
| # |
| # This work is licensed under the terms of the GNU GPL version 2. |
| # |
| |
| import gdb |
| |
| from linux import utils |
| |
| |
| class LxDmesg(gdb.Command): |
| """Print Linux kernel log buffer.""" |
| |
| def __init__(self): |
| super(LxDmesg, self).__init__("lx-dmesg", gdb.COMMAND_DATA) |
| |
| def invoke(self, arg, from_tty): |
| log_buf_addr = int(str(gdb.parse_and_eval("log_buf")).split()[0], 16) |
| log_first_idx = int(gdb.parse_and_eval("log_first_idx")) |
| log_next_idx = int(gdb.parse_and_eval("log_next_idx")) |
| log_buf_len = int(gdb.parse_and_eval("log_buf_len")) |
| |
| inf = gdb.inferiors()[0] |
| start = log_buf_addr + log_first_idx |
| if log_first_idx < log_next_idx: |
| log_buf_2nd_half = -1 |
| length = log_next_idx - log_first_idx |
| log_buf = inf.read_memory(start, length) |
| else: |
| log_buf_2nd_half = log_buf_len - log_first_idx |
| log_buf = inf.read_memory(start, log_buf_2nd_half) + \ |
| inf.read_memory(log_buf_addr, log_next_idx) |
| |
| pos = 0 |
| while pos < log_buf.__len__(): |
| length = utils.read_u16(log_buf[pos + 8:pos + 10]) |
| if length == 0: |
| if log_buf_2nd_half == -1: |
| gdb.write("Corrupted log buffer!\n") |
| break |
| pos = log_buf_2nd_half |
| continue |
| |
| text_len = utils.read_u16(log_buf[pos + 10:pos + 12]) |
| text = log_buf[pos + 16:pos + 16 + text_len] |
| time_stamp = utils.read_u64(log_buf[pos:pos + 8]) |
| |
| for line in memoryview(text).tobytes().splitlines(): |
| gdb.write("[{time:12.6f}] {line}\n".format( |
| time=time_stamp / 1000000000.0, |
| line=line)) |
| |
| pos += length |
| |
| |
| LxDmesg() |
