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);
35 #else /* !CONFIG_FTRACE */
36 # define register_ftrace_function(ops) do { } while (0)
37 # define unregister_ftrace_function(ops) do { } while (0)
38 # define clear_ftrace_function(ops) do { } while (0)
39 static inline void ftrace_kill_atomic(void) { }
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),
51 FTRACE_FL_NOTRACE = (1 << 4),
52 FTRACE_FL_CONVERTED = (1 << 5),
53 FTRACE_FL_FROZEN = (1 << 6),
57 struct hlist_node node;
58 unsigned long ip; /* address of mcount call-site */
62 int ftrace_force_update(void);
63 void ftrace_set_filter(unsigned char *buf, int len, int reset);
66 extern int ftrace_ip_converted(unsigned long ip);
67 extern unsigned char *ftrace_nop_replace(void);
68 extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr);
69 extern int ftrace_dyn_arch_init(void *data);
70 extern int ftrace_mcount_set(unsigned long *data);
71 extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
72 unsigned char *new_code);
73 extern int ftrace_update_ftrace_func(ftrace_func_t func);
74 extern void ftrace_caller(void);
75 extern void ftrace_call(void);
76 extern void mcount_call(void);
78 extern int skip_trace(unsigned long ip);
80 extern void ftrace_release(void *start, unsigned long size);
82 extern void ftrace_disable_daemon(void);
83 extern void ftrace_enable_daemon(void);
86 # define skip_trace(ip) ({ 0; })
87 # define ftrace_force_update() ({ 0; })
88 # define ftrace_set_filter(buf, len, reset) do { } while (0)
89 # define ftrace_disable_daemon() do { } while (0)
90 # define ftrace_enable_daemon() do { } while (0)
91 static inline void ftrace_release(void *start, unsigned long size) { }
92 #endif /* CONFIG_DYNAMIC_FTRACE */
94 /* totally disable ftrace - can not re-enable after this */
95 void ftrace_kill(void);
96 void ftrace_kill_atomic(void);
98 static inline void tracer_disable(void)
106 * Ftrace disable/restore without lock. Some synchronization mechanism
107 * must be used to prevent ftrace_enabled to be changed between
110 static inline int __ftrace_enabled_save(void)
113 int saved_ftrace_enabled = ftrace_enabled;
115 return saved_ftrace_enabled;
121 static inline void __ftrace_enabled_restore(int enabled)
124 ftrace_enabled = enabled;
128 #ifdef CONFIG_FRAME_POINTER
129 /* TODO: need to fix this for ARM */
130 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
131 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
132 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
133 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
134 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
135 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
136 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
138 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
139 # define CALLER_ADDR1 0UL
140 # define CALLER_ADDR2 0UL
141 # define CALLER_ADDR3 0UL
142 # define CALLER_ADDR4 0UL
143 # define CALLER_ADDR5 0UL
144 # define CALLER_ADDR6 0UL
147 #ifdef CONFIG_IRQSOFF_TRACER
148 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
149 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
151 # define time_hardirqs_on(a0, a1) do { } while (0)
152 # define time_hardirqs_off(a0, a1) do { } while (0)
155 #ifdef CONFIG_PREEMPT_TRACER
156 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
157 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
159 # define trace_preempt_on(a0, a1) do { } while (0)
160 # define trace_preempt_off(a0, a1) do { } while (0)
163 #ifdef CONFIG_TRACING
165 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
168 * ftrace_printk - printf formatting in the ftrace buffer
169 * @fmt: the printf format for printing
171 * Note: __ftrace_printk is an internal function for ftrace_printk and
172 * the @ip is passed in via the ftrace_printk macro.
174 * This function allows a kernel developer to debug fast path sections
175 * that printk is not appropriate for. By scattering in various
176 * printk like tracing in the code, a developer can quickly see
177 * where problems are occurring.
179 * This is intended as a debugging tool for the developer only.
180 * Please refrain from leaving ftrace_printks scattered around in
183 # define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
185 __ftrace_printk(unsigned long ip, const char *fmt, ...)
186 __attribute__ ((format (printf, 2, 3)));
187 extern void ftrace_dump(void);
190 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
192 ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0)));
195 ftrace_printk(const char *fmt, ...)
199 static inline void ftrace_dump(void) { }
202 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
203 extern void ftrace_init(void);
204 extern void ftrace_init_module(unsigned long *start, unsigned long *end);
206 static inline void ftrace_init(void) { }
208 ftrace_init_module(unsigned long *start, unsigned long *end) { }
212 #endif /* _LINUX_FTRACE_H */