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
  21 #ifdef CONFIG_DYNAMIC_FTRACE
  22
  23 struct dyn_arch_ftrace {
  24         /* No extra data needed for x86 */
  25 };
  26
  27 #endif /*  CONFIG_DYNAMIC_FTRACE */
  28 #endif /* __ASSEMBLY__ */
  29 #endif /* CONFIG_FUNCTION_TRACER */
  30
  31 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  32
  33 #ifndef __ASSEMBLY__
  34
  35 /*
  36  * Stack of return addresses for functions
  37  * of a thread.
  38  * Used in struct thread_info
  39  */
  40 struct ftrace_ret_stack {
  41         unsigned long ret;
  42         unsigned long func;
  43         unsigned long long calltime;
  44 };
  45
  46 /*
  47  * Primary handler of a function return.
  48  * It relays on ftrace_return_to_handler.
  49  * Defined in entry32.S
  50  */
  51 extern void return_to_handler(void);
  52
  53 #endif /* __ASSEMBLY__ */
  54 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
  55
  56 #endif /* _ASM_X86_FTRACE_H */