1 #ifndef _LINUX_FTRACE_H 2 #define _LINUX_FTRACE_H 3 4 #ifdef CONFIG_FTRACE 5 6 #include <linux/linkage.h> 7 #include <linux/fs.h> 8 9 extern int ftrace_enabled; 10 extern int 11 ftrace_enable_sysctl(struct ctl_table *table, int write, 12 struct file *filp, void __user *buffer, size_t *lenp, 13 loff_t *ppos); 14 15 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); 16 17 struct ftrace_ops { 18 ftrace_func_t func; 19 struct ftrace_ops *next; 20 }; 21 22 /* 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. 28 */ 29 int register_ftrace_function(struct ftrace_ops *ops); 30 int unregister_ftrace_function(struct ftrace_ops *ops); 31 void clear_ftrace_function(void); 32 33 extern void ftrace_stub(unsigned long a0, unsigned long a1); 34 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 #endif /* CONFIG_FTRACE */ 40 41 #ifdef CONFIG_DYNAMIC_FTRACE 42 # define FTRACE_HASHBITS 10 43 # define FTRACE_HASHSIZE (1<<FTRACE_HASHBITS) 44 45 enum { 46 FTRACE_FL_FREE = (1 << 0), 47 FTRACE_FL_FAILED = (1 << 1), 48 FTRACE_FL_FILTER = (1 << 2), 49 FTRACE_FL_ENABLED = (1 << 3), 50 FTRACE_FL_NOTRACE = (1 << 4), 51 FTRACE_FL_CONVERTED = (1 << 5), 52 FTRACE_FL_FROZEN = (1 << 6), 53 }; 54 55 struct dyn_ftrace { 56 struct hlist_node node; 57 unsigned long ip; /* address of mcount call-site */ 58 unsigned long flags; 59 }; 60 61 int ftrace_force_update(void); 62 void ftrace_set_filter(unsigned char *buf, int len, int reset); 63 64 /* defined in arch */ 65 extern int ftrace_ip_converted(unsigned long ip); 66 extern unsigned char *ftrace_nop_replace(void); 67 extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr); 68 extern int ftrace_dyn_arch_init(void *data); 69 extern int ftrace_mcount_set(unsigned long *data); 70 extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code, 71 unsigned char *new_code); 72 extern int ftrace_update_ftrace_func(ftrace_func_t func); 73 extern void ftrace_caller(void); 74 extern void ftrace_call(void); 75 extern void mcount_call(void); 76 77 extern int skip_trace(unsigned long ip); 78 79 void ftrace_disable_daemon(void); 80 void ftrace_enable_daemon(void); 81 82 #else 83 # define skip_trace(ip) ({ 0; }) 84 # define ftrace_force_update() ({ 0; }) 85 # define ftrace_set_filter(buf, len, reset) do { } while (0) 86 # define ftrace_disable_daemon() do { } while (0) 87 # define ftrace_enable_daemon() do { } while (0) 88 #endif /* CONFIG_DYNAMIC_FTRACE */ 89 90 /* totally disable ftrace - can not re-enable after this */ 91 void ftrace_kill(void); 92 void ftrace_kill_atomic(void); 93 94 static inline void tracer_disable(void) 95 { 96 #ifdef CONFIG_FTRACE 97 ftrace_enabled = 0; 98 #endif 99 } 100 101 #ifdef CONFIG_FRAME_POINTER 102 /* TODO: need to fix this for ARM */ 103 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) 104 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) 105 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) 106 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) 107 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) 108 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) 109 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) 110 #else 111 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) 112 # define CALLER_ADDR1 0UL 113 # define CALLER_ADDR2 0UL 114 # define CALLER_ADDR3 0UL 115 # define CALLER_ADDR4 0UL 116 # define CALLER_ADDR5 0UL 117 # define CALLER_ADDR6 0UL 118 #endif 119 120 #ifdef CONFIG_IRQSOFF_TRACER 121 extern void time_hardirqs_on(unsigned long a0, unsigned long a1); 122 extern void time_hardirqs_off(unsigned long a0, unsigned long a1); 123 #else 124 # define time_hardirqs_on(a0, a1) do { } while (0) 125 # define time_hardirqs_off(a0, a1) do { } while (0) 126 #endif 127 128 #ifdef CONFIG_PREEMPT_TRACER 129 extern void trace_preempt_on(unsigned long a0, unsigned long a1); 130 extern void trace_preempt_off(unsigned long a0, unsigned long a1); 131 #else 132 # define trace_preempt_on(a0, a1) do { } while (0) 133 # define trace_preempt_off(a0, a1) do { } while (0) 134 #endif 135 136 #ifdef CONFIG_TRACING 137 extern void 138 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); 139 #else 140 static inline void 141 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } 142 #endif 143 144 #endif /* _LINUX_FTRACE_H */ 145