LXR linux/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__
   9extern void mcount(void);
  10
  11static 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 */
  25