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 #ifdef CONFIG_DYNAMIC_FTRACE
  36 # define FTRACE_HASHBITS        10
  37 # define FTRACE_HASHSIZE        (1<<FTRACE_HASHBITS)
  38
  39 struct dyn_ftrace {
  40         struct hlist_node node;
  41         unsigned long     ip;
  42 };
  43
  44 /* defined in arch */
  45 extern struct dyn_ftrace *
  46 ftrace_alloc_shutdown_node(unsigned long ip);
  47 extern int ftrace_shutdown_arch_init(void);
  48 extern void ftrace_code_disable(struct dyn_ftrace *rec);
  49 extern void ftrace_startup_code(void);
  50 extern void ftrace_shutdown_code(void);
  51 extern void ftrace_shutdown_replenish(void);
  52 #endif
  53
  54 #ifdef CONFIG_FRAME_POINTER
  55 /* TODO: need to fix this for ARM */
  56 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  57 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
  58 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
  59 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
  60 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
  61 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
  62 #else
  63 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  64 # define CALLER_ADDR1 0UL
  65 # define CALLER_ADDR2 0UL
  66 # define CALLER_ADDR3 0UL
  67 # define CALLER_ADDR4 0UL
  68 # define CALLER_ADDR5 0UL
  69 #endif
  70
  71 #ifdef CONFIG_IRQSOFF_TRACER
  72   extern void notrace time_hardirqs_on(unsigned long a0, unsigned long a1);
  73   extern void notrace time_hardirqs_off(unsigned long a0, unsigned long a1);
  74 #else
  75 # define time_hardirqs_on(a0, a1)               do { } while (0)
  76 # define time_hardirqs_off(a0, a1)              do { } while (0)
  77 #endif
  78
  79 #ifdef CONFIG_PREEMPT_TRACER
  80   extern void notrace trace_preempt_on(unsigned long a0, unsigned long a1);
  81   extern void notrace trace_preempt_off(unsigned long a0, unsigned long a1);
  82 #else
  83 # define trace_preempt_on(a0, a1)               do { } while (0)
  84 # define trace_preempt_off(a0, a1)              do { } while (0)
  85 #endif
  86
  87 #endif /* _LINUX_FTRACE_H */