kernel/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
  17 extern void _mcount(void);
  18 #define MCOUNT_ADDR ((unsigned long)_mcount)
  19
  20 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  21 {
  22         return addr;
  23 }
  24
  25 struct 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
  34 extern 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
  62 extern 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