X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=Documentation%2Fkdump%2Fgdbmacros.txt;h=9b9b454b048ad78e9745a3d12971aa0cff665fc5;hb=0d8e573c30a317f1b37808fce4f8c7b3f801674f;hp=bc1b9eb92ae129982ad34d6dbac4c61dbd58861b;hpb=ab997aaeb9cf7a0da1cecc46c5bb6c7262416917;p=firefly-linux-kernel-4.4.55.git

diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt
index bc1b9eb92ae1..9b9b454b048a 100644
--- a/Documentation/kdump/gdbmacros.txt
+++ b/Documentation/kdump/gdbmacros.txt
@@ -175,5 +175,27 @@ end
 document trapinfo
 	Run info threads and lookup pid of thread #1
 	'trapinfo <pid>' will tell you by which trap & possibly
-	addresthe kernel paniced.
+	address the kernel panicked.
+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