arch/xtensa/include/asm/stacktrace.h

   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 */