1 /*
2  * arch/xtensa/include/asm/stacktrace.h
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 2001 - 2013 Tensilica Inc.
9  */
10 #ifndef _XTENSA_STACKTRACE_H
11 #define _XTENSA_STACKTRACE_H
12 
13 #include <linux/sched.h>
14 
15 struct stackframe {
16 	unsigned long pc;
17 	unsigned long sp;
18 };
19 
20 static __always_inline unsigned long *stack_pointer(struct task_struct *task)
21 {
22 	unsigned long *sp;
23 
24 	if (!task || task == current)
25 		__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
26 	else
27 		sp = (unsigned long *)task->thread.sp;
28 
29 	return sp;
30 }
31 
32 void walk_stackframe(unsigned long *sp,
33 		int (*fn)(struct stackframe *frame, void *data),
34 		void *data);
35 
36 #endif /* _XTENSA_STACKTRACE_H */
37