xtensa: add stacktrace support

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/xtensa/include/asm/stacktrace.h b/arch/xtensa/include/asm/stacktrace.h
new file mode 100644
index 000000000000..6a05fcb0a20d
--- /dev/null
+++ b/arch/xtensa/include/asm/stacktrace.h
@@ -0,0 +1,36 @@
+/*
+ * arch/xtensa/include/asm/stacktrace.h
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2013 Tensilica Inc.
+ */
+#ifndef _XTENSA_STACKTRACE_H
+#define _XTENSA_STACKTRACE_H
+
+#include <linux/sched.h>
+
+struct stackframe {
+        unsigned long pc;
+        unsigned long sp;
+};
+
+static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+{
+        unsigned long *sp;
+
+        if (!task || task == current)
+                __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+        else
+                sp = (unsigned long *)task->thread.sp;
+
+        return sp;
+}
+
+void walk_stackframe(unsigned long *sp,
+                int (*fn)(struct stackframe *frame, void *data),
+                void *data);
+
+#endif /* _XTENSA_STACKTRACE_H */