1 #ifndef _LINUX_FTRACE_H
2 #define _LINUX_FTRACE_H
6 #include <linux/linkage.h>
9 extern int ftrace_enabled;
11 ftrace_enable_sysctl(struct ctl_table *table, int write,
12 struct file *filp, void __user *buffer, size_t *lenp,
15 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
19 struct ftrace_ops *next;
23 * The ftrace_ops must be a static and should also
24 * be read_mostly. These functions do modify read_mostly variables
25 * so use them sparely. Never free an ftrace_op or modify the
26 * next pointer after it has been registered. Even after unregistering
27 * it, the next pointer may still be used internally.
29 int register_ftrace_function(struct ftrace_ops *ops);
30 int unregister_ftrace_function(struct ftrace_ops *ops);
31 void clear_ftrace_function(void);
33 extern void ftrace_stub(unsigned long a0, unsigned long a1);
34 extern void mcount(void);
36 #else /* !CONFIG_FTRACE */
37 # define register_ftrace_function(ops) do { } while (0)
38 # define unregister_ftrace_function(ops) do { } while (0)
39 # define clear_ftrace_function(ops) do { } while (0)
40 #endif /* CONFIG_FTRACE */
42 #ifdef CONFIG_DYNAMIC_FTRACE
43 # define FTRACE_HASHBITS 10
44 # define FTRACE_HASHSIZE (1<<FTRACE_HASHBITS)
47 FTRACE_FL_FREE = (1 << 0),
48 FTRACE_FL_FAILED = (1 << 1),
49 FTRACE_FL_FILTER = (1 << 2),
50 FTRACE_FL_ENABLED = (1 << 3),
54 struct hlist_node node;
59 int ftrace_force_update(void);
60 void ftrace_set_filter(unsigned char *buf, int len, int reset);
63 extern int ftrace_ip_converted(unsigned long ip);
64 extern unsigned char *ftrace_nop_replace(void);
65 extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr);
66 extern int ftrace_dyn_arch_init(void *data);
67 extern int ftrace_mcount_set(unsigned long *data);
68 extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
69 unsigned char *new_code);
70 extern int ftrace_update_ftrace_func(ftrace_func_t func);
71 extern void ftrace_caller(void);
72 extern void ftrace_call(void);
73 extern void mcount_call(void);
75 # define ftrace_force_update() ({ 0; })
76 # define ftrace_set_filter(buf, len, reset) do { } while (0)
79 /* totally disable ftrace - can not re-enable after this */
80 void ftrace_kill(void);
82 static inline void tracer_disable(void)
89 #ifdef CONFIG_FRAME_POINTER
90 /* TODO: need to fix this for ARM */
91 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
92 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
93 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
94 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
95 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
96 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
97 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
99 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
100 # define CALLER_ADDR1 0UL
101 # define CALLER_ADDR2 0UL
102 # define CALLER_ADDR3 0UL
103 # define CALLER_ADDR4 0UL
104 # define CALLER_ADDR5 0UL
105 # define CALLER_ADDR6 0UL
108 #ifdef CONFIG_IRQSOFF_TRACER
109 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
110 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
112 # define time_hardirqs_on(a0, a1) do { } while (0)
113 # define time_hardirqs_off(a0, a1) do { } while (0)
116 #ifdef CONFIG_PREEMPT_TRACER
117 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
118 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
120 # define trace_preempt_on(a0, a1) do { } while (0)
121 # define trace_preempt_off(a0, a1) do { } while (0)
124 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
126 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
129 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
132 #endif /* _LINUX_FTRACE_H */