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| author | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:21 -0500 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:21 -0500 |
| commit | 67fc4e0cb931d6b4ccf21248e4199b154478ecea (patch) | |
| tree | 4cf49d00bc9ac03c3c77d91fadd13fcabc75e0c9 /kernel/printk.c | |
| parent | 5d5314d6795f3c1c0f415348ff8c51f7de042b77 (diff) | |
| download | lwn-67fc4e0cb931d6b4ccf21248e4199b154478ecea.tar.gz lwn-67fc4e0cb931d6b4ccf21248e4199b154478ecea.zip | |
kdb: core for kgdb back end (2 of 2)
This patch contains the hooks and instrumentation into kernel which
live outside the kernel/debug directory, which the kdb core
will call to run commands like lsmod, dmesg, bt etc...
CC: linux-arch@vger.kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Martin Hicks <mort@sgi.com>
Diffstat (limited to 'kernel/printk.c')
| -rw-r--r-- | kernel/printk.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 75077ad0b537..9213b8b5bb4f 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -413,6 +413,22 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len) return do_syslog(type, buf, len, SYSLOG_FROM_CALL); } +#ifdef CONFIG_KGDB_KDB +/* kdb dmesg command needs access to the syslog buffer. do_syslog() + * uses locks so it cannot be used during debugging. Just tell kdb + * where the start and end of the physical and logical logs are. This + * is equivalent to do_syslog(3). + */ +void kdb_syslog_data(char *syslog_data[4]) +{ + syslog_data[0] = log_buf; + syslog_data[1] = log_buf + log_buf_len; + syslog_data[2] = log_buf + log_end - + (logged_chars < log_buf_len ? logged_chars : log_buf_len); + syslog_data[3] = log_buf + log_end; +} +#endif /* CONFIG_KGDB_KDB */ + /* * Call the console drivers on a range of log_buf */ |