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-rw-r--r--Documentation/kdump/gdbmacros.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt
index bc1b9eb92ae1..dcf5580380ab 100644
--- a/Documentation/kdump/gdbmacros.txt
+++ b/Documentation/kdump/gdbmacros.txt
@@ -177,3 +177,25 @@ document trapinfo
'trapinfo <pid>' will tell you by which trap & possibly
addresthe kernel paniced.
end
+
+
+define dmesg
+ set $i = 0
+ set $end_idx = (log_end - 1) & (log_buf_len - 1)
+
+ while ($i < logged_chars)
+ set $idx = (log_end - 1 - logged_chars + $i) & (log_buf_len - 1)
+
+ if ($idx + 100 <= $end_idx) || \
+ ($end_idx <= $idx && $idx + 100 < log_buf_len)
+ printf "%.100s", &log_buf[$idx]
+ set $i = $i + 100
+ else
+ printf "%c", log_buf[$idx]
+ set $i = $i + 1
+ end
+ end
+end
+document dmesg
+ print the kernel ring buffer
+end
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