arch/arm/include/asm/ftrace.h

   1 #ifndef _ASM_ARM_FTRACE
   2 #define _ASM_ARM_FTRACE
   3
   4 #ifdef CONFIG_FUNCTION_TRACER
   5 #define MCOUNT_ADDR             ((unsigned long)(__gnu_mcount_nc))
   6 #define MCOUNT_INSN_SIZE        4 /* sizeof mcount call */
   7
   8 #ifndef __ASSEMBLY__
   9 extern void mcount(void);
  10 extern void __gnu_mcount_nc(void);
  11
  12 #ifdef CONFIG_DYNAMIC_FTRACE
  13 struct dyn_arch_ftrace {
  14 #ifdef CONFIG_OLD_MCOUNT
  15         bool    old_mcount;
  16 #endif
  17 };
  18
  19 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  20 {
  21         /* With Thumb-2, the recorded addresses have the lsb set */
  22         return addr & ~1;
  23 }
  24
  25 extern void ftrace_caller_old(void);
  26 extern void ftrace_call_old(void);
  27 #endif
  28
  29 #endif
  30
  31 #endif
  32
  33 #ifndef __ASSEMBLY__
  34
  35 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
  36 /*
  37  * return_address uses walk_stackframe to do it's work.  If both
  38  * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
  39  * information.  For this to work in the function tracer many functions would
  40  * have to be marked with __notrace.  So for now just depend on
  41  * !CONFIG_ARM_UNWIND.
  42  */
  43
  44 void *return_address(unsigned int);
  45
  46 #else
  47
  48 static inline void *return_address(unsigned int level)
  49 {
  50         return NULL;
  51 }
  52
  53 #endif
  54
  55 #define ftrace_return_address(n) return_address(n)
  56
  57 #endif /* ifndef __ASSEMBLY__ */
  58
  59 #endif /* _ASM_ARM_FTRACE */