1 files changed, 57 insertions, 0 deletions

diff --git a/arch/mips/lib-64/watch.S b/arch/mips/lib-64/watch.S
new file mode 100644
index 000000000000..f91434013695
--- /dev/null
+++ b/arch/mips/lib-64/watch.S
@@ -0,0 +1,57 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Kernel debug stuff to use the Watch registers.
+ * Useful to find stack overflows, dangling pointers etc.
+ *
+ * Copyright (C) 1995, 1996, 1999, 2001 by Ralf Baechle
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+
+                .set    noreorder
+/*
+ * Parameter: a0 - physical address to watch
+ *            a1 - set bit #1 to trap on load references
+ *                     bit #0 to trap on store references
+ * Results  : none
+ */
+                LEAF(__watch_set)
+                ori     a0, 7
+                xori    a0, 7
+                or      a0, a1
+                mtc0    a0, CP0_WATCHLO
+                sd      a0, watch_savelo
+                dsrl32  a0, a0, 0
+
+                jr      ra
+                 mtc0   zero, CP0_WATCHHI
+                END(__watch_set)
+
+/*
+ * Parameter: none
+ * Results  : none
+ */
+                LEAF(__watch_clear)
+                jr      ra
+                 mtc0   zero, CP0_WATCHLO
+                END(__watch_clear)
+
+/*
+ * Parameter: none
+ * Results  : none
+ */
+                LEAF(__watch_reenable)
+                ld      t0, watch_savelo
+                jr      ra
+                 mtc0   t0, CP0_WATCHLO
+                END(__watch_reenable)
+
+/*
+ * Saved value of the c0_watchlo register for watch_reenable()
+ */
+                .local  watch_savelo
+                .comm   watch_savelo, 8, 8