LXR linux/arch/blackfin/include/asm/ftrace.h

   1/*
   2 * Blackfin ftrace code
   3 *
   4 * Copyright 2009 Analog Devices Inc.
   5 * Licensed under the GPL-2 or later.
   6 */
   7
   8#ifndef __ASM_BFIN_FTRACE_H__
   9#define __ASM_BFIN_FTRACE_H__
  10
  11#define MCOUNT_INSN_SIZE        6 /* sizeof "[++sp] = rets; call __mcount;" */
  12
  13#ifndef __ASSEMBLY__
  14
  15#ifdef CONFIG_DYNAMIC_FTRACE
  16
  17extern void _mcount(void);
  18#define MCOUNT_ADDR ((unsigned long)_mcount)
  19
  20static inline unsigned long ftrace_call_adjust(unsigned long addr)
  21{
  22        return addr;
  23}
  24
  25struct dyn_arch_ftrace {
  26        /* No extra data needed for Blackfin */
  27};
  28
  29#endif
  30
  31#ifdef CONFIG_FRAME_POINTER
  32#include <linux/mm.h>
  33
  34extern inline void *return_address(unsigned int level)
  35{
  36        unsigned long *endstack, *fp, *ret_addr;
  37        unsigned int current_level = 0;
  38
  39        if (level == 0)
  40                return __builtin_return_address(0);
  41
  42        fp = (unsigned long *)__builtin_frame_address(0);
  43        endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);
  44
  45        while (((unsigned long)fp & 0x3) == 0 && fp &&
  46               (fp + 1) < endstack && current_level < level) {
  47                fp = (unsigned long *)*fp;
  48                current_level++;
  49        }
  50
  51        if (((unsigned long)fp & 0x3) == 0 && fp &&
  52            (fp + 1) < endstack)
  53                ret_addr = (unsigned long *)*(fp + 1);
  54        else
  55                ret_addr = NULL;
  56
  57        return ret_addr;
  58}
  59
  60#else
  61
  62extern inline void *return_address(unsigned int level)
  63{
  64        return NULL;
  65}
  66
  67#endif /* CONFIG_FRAME_POINTER */
  68
  69#define ftrace_return_address(n) return_address(n)
  70
  71#endif /* __ASSEMBLY__ */
  72
  73#endif
  74