1 #ifndef _LINUX_FTRACE_H
2 #define _LINUX_FTRACE_H
4 #include <linux/linkage.h>
6 #include <linux/ktime.h>
7 #include <linux/init.h>
8 #include <linux/types.h>
9 #include <linux/kallsyms.h>
13 extern int ftrace_enabled
;
15 ftrace_enable_sysctl(struct ctl_table
*table
, int write
,
16 struct file
*filp
, void __user
*buffer
, size_t *lenp
,
19 typedef void (*ftrace_func_t
)(unsigned long ip
, unsigned long parent_ip
);
23 struct ftrace_ops
*next
;
27 * The ftrace_ops must be a static and should also
28 * be read_mostly. These functions do modify read_mostly variables
29 * so use them sparely. Never free an ftrace_op or modify the
30 * next pointer after it has been registered. Even after unregistering
31 * it, the next pointer may still be used internally.
33 int register_ftrace_function(struct ftrace_ops
*ops
);
34 int unregister_ftrace_function(struct ftrace_ops
*ops
);
35 void clear_ftrace_function(void);
37 extern void ftrace_stub(unsigned long a0
, unsigned long a1
);
39 #else /* !CONFIG_FTRACE */
40 # define register_ftrace_function(ops) do { } while (0)
41 # define unregister_ftrace_function(ops) do { } while (0)
42 # define clear_ftrace_function(ops) do { } while (0)
43 static inline void ftrace_kill_atomic(void) { }
44 #endif /* CONFIG_FTRACE */
46 #ifdef CONFIG_DYNAMIC_FTRACE
47 # define FTRACE_HASHBITS 10
48 # define FTRACE_HASHSIZE (1<<FTRACE_HASHBITS)
51 FTRACE_FL_FREE
= (1 << 0),
52 FTRACE_FL_FAILED
= (1 << 1),
53 FTRACE_FL_FILTER
= (1 << 2),
54 FTRACE_FL_ENABLED
= (1 << 3),
55 FTRACE_FL_NOTRACE
= (1 << 4),
56 FTRACE_FL_CONVERTED
= (1 << 5),
57 FTRACE_FL_FROZEN
= (1 << 6),
61 struct hlist_node node
;
62 unsigned long ip
; /* address of mcount call-site */
66 int ftrace_force_update(void);
67 void ftrace_set_filter(unsigned char *buf
, int len
, int reset
);
70 extern int ftrace_ip_converted(unsigned long ip
);
71 extern unsigned char *ftrace_nop_replace(void);
72 extern unsigned char *ftrace_call_replace(unsigned long ip
, unsigned long addr
);
73 extern int ftrace_dyn_arch_init(void *data
);
74 extern int ftrace_mcount_set(unsigned long *data
);
75 extern int ftrace_modify_code(unsigned long ip
, unsigned char *old_code
,
76 unsigned char *new_code
);
77 extern int ftrace_update_ftrace_func(ftrace_func_t func
);
78 extern void ftrace_caller(void);
79 extern void ftrace_call(void);
80 extern void mcount_call(void);
82 extern int skip_trace(unsigned long ip
);
84 extern void ftrace_release(void *start
, unsigned long size
);
86 extern void ftrace_disable_daemon(void);
87 extern void ftrace_enable_daemon(void);
90 # define skip_trace(ip) ({ 0; })
91 # define ftrace_force_update() ({ 0; })
92 # define ftrace_set_filter(buf, len, reset) do { } while (0)
93 # define ftrace_disable_daemon() do { } while (0)
94 # define ftrace_enable_daemon() do { } while (0)
95 static inline void ftrace_release(void *start
, unsigned long size
) { }
96 #endif /* CONFIG_DYNAMIC_FTRACE */
98 /* totally disable ftrace - can not re-enable after this */
99 void ftrace_kill(void);
100 void ftrace_kill_atomic(void);
102 static inline void tracer_disable(void)
110 * Ftrace disable/restore without lock. Some synchronization mechanism
111 * must be used to prevent ftrace_enabled to be changed between
114 static inline int __ftrace_enabled_save(void)
117 int saved_ftrace_enabled
= ftrace_enabled
;
119 return saved_ftrace_enabled
;
125 static inline void __ftrace_enabled_restore(int enabled
)
128 ftrace_enabled
= enabled
;
132 #ifdef CONFIG_FRAME_POINTER
133 /* TODO: need to fix this for ARM */
134 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
135 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
136 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
137 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
138 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
139 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
140 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
142 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
143 # define CALLER_ADDR1 0UL
144 # define CALLER_ADDR2 0UL
145 # define CALLER_ADDR3 0UL
146 # define CALLER_ADDR4 0UL
147 # define CALLER_ADDR5 0UL
148 # define CALLER_ADDR6 0UL
151 #ifdef CONFIG_IRQSOFF_TRACER
152 extern void time_hardirqs_on(unsigned long a0
, unsigned long a1
);
153 extern void time_hardirqs_off(unsigned long a0
, unsigned long a1
);
155 # define time_hardirqs_on(a0, a1) do { } while (0)
156 # define time_hardirqs_off(a0, a1) do { } while (0)
159 #ifdef CONFIG_PREEMPT_TRACER
160 extern void trace_preempt_on(unsigned long a0
, unsigned long a1
);
161 extern void trace_preempt_off(unsigned long a0
, unsigned long a1
);
163 # define trace_preempt_on(a0, a1) do { } while (0)
164 # define trace_preempt_off(a0, a1) do { } while (0)
167 #ifdef CONFIG_TRACING
169 ftrace_special(unsigned long arg1
, unsigned long arg2
, unsigned long arg3
);
172 * ftrace_printk - printf formatting in the ftrace buffer
173 * @fmt: the printf format for printing
175 * Note: __ftrace_printk is an internal function for ftrace_printk and
176 * the @ip is passed in via the ftrace_printk macro.
178 * This function allows a kernel developer to debug fast path sections
179 * that printk is not appropriate for. By scattering in various
180 * printk like tracing in the code, a developer can quickly see
181 * where problems are occurring.
183 * This is intended as a debugging tool for the developer only.
184 * Please refrain from leaving ftrace_printks scattered around in
187 # define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
189 __ftrace_printk(unsigned long ip
, const char *fmt
, ...)
190 __attribute__ ((format (printf
, 2, 3)));
191 extern void ftrace_dump(void);
194 ftrace_special(unsigned long arg1
, unsigned long arg2
, unsigned long arg3
) { }
196 ftrace_printk(const char *fmt
, ...) __attribute__ ((format (printf
, 1, 0)));
199 ftrace_printk(const char *fmt
, ...)
203 static inline void ftrace_dump(void) { }
206 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
207 extern void ftrace_init(void);
208 extern void ftrace_init_module(unsigned long *start
, unsigned long *end
);
210 static inline void ftrace_init(void) { }
212 ftrace_init_module(unsigned long *start
, unsigned long *end
) { }
218 char func
[KSYM_NAME_LEN
];
220 unsigned long long duration
; /* usecs */
225 #ifdef CONFIG_BOOT_TRACER
226 extern void trace_boot(struct boot_trace
*it
, initcall_t fn
);
227 extern void start_boot_trace(void);
228 extern void stop_boot_trace(void);
230 static inline void trace_boot(struct boot_trace
*it
, initcall_t fn
) { }
231 static inline void start_boot_trace(void) { }
232 static inline void stop_boot_trace(void) { }
237 #endif /* _LINUX_FTRACE_H */