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Linux/arch/xtensa/include/asm/stacktrace.h

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  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 void xtensa_backtrace_kernel(struct pt_regs *regs, unsigned int depth,
 37                              int (*kfn)(struct stackframe *frame, void *data),
 38                              int (*ufn)(struct stackframe *frame, void *data),
 39                              void *data);
 40 void xtensa_backtrace_user(struct pt_regs *regs, unsigned int depth,
 41                            int (*ufn)(struct stackframe *frame, void *data),
 42                            void *data);
 43 
 44 #endif /* _XTENSA_STACKTRACE_H */
 45 

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