arch/x86/include/asm/ftrace.h

   1 #ifndef _ASM_X86_FTRACE_H
   2 #define _ASM_X86_FTRACE_H
   3
   4 #ifdef CONFIG_FUNCTION_TRACER
   5 #define MCOUNT_ADDR             ((long)(mcount))
   6 #define MCOUNT_INSN_SIZE        5 /* sizeof mcount call */
   7
   8 #ifndef __ASSEMBLY__
   9 extern void mcount(void);
  10
  11 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  12 {
  13         /*
  14          * call mcount is "e8 <4 byte offset>"
  15          * The addr points to the 4 byte offset and the caller of this
  16          * function wants the pointer to e8. Simply subtract one.
  17          */
  18         return addr - 1;
  19 }
  20 #endif
  21
  22 #endif /* CONFIG_FUNCTION_TRACER */
  23
  24 #endif /* _ASM_X86_FTRACE_H */