1 #ifndef _LINUX_HW_BREAKPOINT_H
2 #define _LINUX_HW_BREAKPOINT_H
5 HW_BREAKPOINT_LEN_1
= 1,
6 HW_BREAKPOINT_LEN_2
= 2,
7 HW_BREAKPOINT_LEN_4
= 4,
8 HW_BREAKPOINT_LEN_8
= 8,
12 HW_BREAKPOINT_EMPTY
= 0,
15 HW_BREAKPOINT_RW
= HW_BREAKPOINT_R
| HW_BREAKPOINT_W
,
17 HW_BREAKPOINT_INVALID
= HW_BREAKPOINT_RW
| HW_BREAKPOINT_X
,
22 #ifdef CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
32 #include <linux/perf_event.h>
34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
36 static inline void hw_breakpoint_init(struct perf_event_attr
*attr
)
38 memset(attr
, 0, sizeof(*attr
));
40 attr
->type
= PERF_TYPE_BREAKPOINT
;
41 attr
->size
= sizeof(*attr
);
43 * As it's for in-kernel or ptrace use, we want it to be pinned
44 * and to call its callback every hits.
47 attr
->sample_period
= 1;
50 static inline void ptrace_breakpoint_init(struct perf_event_attr
*attr
)
52 hw_breakpoint_init(attr
);
53 attr
->exclude_kernel
= 1;
56 static inline unsigned long hw_breakpoint_addr(struct perf_event
*bp
)
58 return bp
->attr
.bp_addr
;
61 static inline int hw_breakpoint_type(struct perf_event
*bp
)
63 return bp
->attr
.bp_type
;
66 static inline unsigned long hw_breakpoint_len(struct perf_event
*bp
)
68 return bp
->attr
.bp_len
;
71 extern struct perf_event
*
72 register_user_hw_breakpoint(struct perf_event_attr
*attr
,
73 perf_overflow_handler_t triggered
,
74 struct task_struct
*tsk
);
77 modify_user_hw_breakpoint(struct perf_event
*bp
, struct perf_event_attr
*attr
);
80 * Kernel breakpoints are not associated with any particular thread.
82 extern struct perf_event
*
83 register_wide_hw_breakpoint_cpu(struct perf_event_attr
*attr
,
84 perf_overflow_handler_t triggered
,
87 extern struct perf_event
* __percpu
*
88 register_wide_hw_breakpoint(struct perf_event_attr
*attr
,
89 perf_overflow_handler_t triggered
);
91 extern int register_perf_hw_breakpoint(struct perf_event
*bp
);
92 extern int __register_perf_hw_breakpoint(struct perf_event
*bp
);
93 extern void unregister_hw_breakpoint(struct perf_event
*bp
);
94 extern void unregister_wide_hw_breakpoint(struct perf_event
* __percpu
*cpu_events
);
96 extern int dbg_reserve_bp_slot(struct perf_event
*bp
);
97 extern int dbg_release_bp_slot(struct perf_event
*bp
);
98 extern int reserve_bp_slot(struct perf_event
*bp
);
99 extern void release_bp_slot(struct perf_event
*bp
);
101 extern void flush_ptrace_hw_breakpoint(struct task_struct
*tsk
);
103 static inline struct arch_hw_breakpoint
*counter_arch_bp(struct perf_event
*bp
)
108 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
110 static inline struct perf_event
*
111 register_user_hw_breakpoint(struct perf_event_attr
*attr
,
112 perf_overflow_handler_t triggered
,
113 struct task_struct
*tsk
) { return NULL
; }
115 modify_user_hw_breakpoint(struct perf_event
*bp
,
116 struct perf_event_attr
*attr
) { return -ENOSYS
; }
117 static inline struct perf_event
*
118 register_wide_hw_breakpoint_cpu(struct perf_event_attr
*attr
,
119 perf_overflow_handler_t triggered
,
120 int cpu
) { return NULL
; }
121 static inline struct perf_event
* __percpu
*
122 register_wide_hw_breakpoint(struct perf_event_attr
*attr
,
123 perf_overflow_handler_t triggered
) { return NULL
; }
125 register_perf_hw_breakpoint(struct perf_event
*bp
) { return -ENOSYS
; }
127 __register_perf_hw_breakpoint(struct perf_event
*bp
) { return -ENOSYS
; }
128 static inline void unregister_hw_breakpoint(struct perf_event
*bp
) { }
130 unregister_wide_hw_breakpoint(struct perf_event
* __percpu
*cpu_events
) { }
132 reserve_bp_slot(struct perf_event
*bp
) {return -ENOSYS
; }
133 static inline void release_bp_slot(struct perf_event
*bp
) { }
135 static inline void flush_ptrace_hw_breakpoint(struct task_struct
*tsk
) { }
137 static inline struct arch_hw_breakpoint
*counter_arch_bp(struct perf_event
*bp
)
142 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
143 #endif /* __KERNEL__ */
145 #endif /* _LINUX_HW_BREAKPOINT_H */