include/linux/ftrace.h

   1 #ifndef _LINUX_FTRACE_H
   2 #define _LINUX_FTRACE_H
   3
   4 #ifdef CONFIG_FTRACE
   5
   6 #include <linux/linkage.h>
   7
   8 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
   9
  10 struct ftrace_ops {
  11         ftrace_func_t     func;
  12         struct ftrace_ops *next;
  13 };
  14
  15 /*
  16  * The ftrace_ops must be a static and should also
  17  * be read_mostly.  These functions do modify read_mostly variables
  18  * so use them sparely. Never free an ftrace_op or modify the
  19  * next pointer after it has been registered. Even after unregistering
  20  * it, the next pointer may still be used internally.
  21  */
  22 int register_ftrace_function(struct ftrace_ops *ops);
  23 int unregister_ftrace_function(struct ftrace_ops *ops);
  24 void clear_ftrace_function(void);
  25
  26 extern void ftrace_stub(unsigned long a0, unsigned long a1);
  27 extern void mcount(void);
  28
  29 #else /* !CONFIG_FTRACE */
  30 # define register_ftrace_function(ops) do { } while (0)
  31 # define unregister_ftrace_function(ops) do { } while (0)
  32 # define clear_ftrace_function(ops) do { } while (0)
  33 #endif /* CONFIG_FTRACE */
  34
  35
  36 #ifdef CONFIG_FRAME_POINTER
  37 /* TODO: need to fix this for ARM */
  38 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  39 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
  40 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
  41 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
  42 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
  43 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
  44 #else
  45 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  46 # define CALLER_ADDR1 0UL
  47 # define CALLER_ADDR2 0UL
  48 # define CALLER_ADDR3 0UL
  49 # define CALLER_ADDR4 0UL
  50 # define CALLER_ADDR5 0UL
  51 #endif
  52
  53 #ifdef CONFIG_IRQSOFF_TRACER
  54   extern void notrace time_hardirqs_on(unsigned long a0, unsigned long a1);
  55   extern void notrace time_hardirqs_off(unsigned long a0, unsigned long a1);
  56 #else
  57 # define time_hardirqs_on(a0, a1)               do { } while (0)
  58 # define time_hardirqs_off(a0, a1)              do { } while (0)
  59 #endif
  60
  61 #endif /* _LINUX_FTRACE_H */