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 #include <linux/perf_event.h>
24 #ifdef CONFIG_HAVE_HW_BREAKPOINT
26 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
28 memset(attr, 0, sizeof(*attr));
30 attr->type = PERF_TYPE_BREAKPOINT;
31 attr->size = sizeof(*attr);
33 * As it's for in-kernel or ptrace use, we want it to be pinned
34 * and to call its callback every hits.
37 attr->sample_period = 1;
40 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
42 hw_breakpoint_init(attr);
43 attr->exclude_kernel = 1;
46 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
48 return bp->attr.bp_addr;
51 static inline int hw_breakpoint_type(struct perf_event *bp)
53 return bp->attr.bp_type;
56 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
58 return bp->attr.bp_len;
61 extern struct perf_event *
62 register_user_hw_breakpoint(struct perf_event_attr *attr,
63 perf_overflow_handler_t triggered,
64 struct task_struct *tsk);
66 /* FIXME: only change from the attr, and don't unregister */
68 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
71 * Kernel breakpoints are not associated with any particular thread.
73 extern struct perf_event *
74 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
75 perf_overflow_handler_t triggered,
78 extern struct perf_event * __percpu *
79 register_wide_hw_breakpoint(struct perf_event_attr *attr,
80 perf_overflow_handler_t triggered);
82 extern int register_perf_hw_breakpoint(struct perf_event *bp);
83 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
84 extern void unregister_hw_breakpoint(struct perf_event *bp);
85 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
87 extern int dbg_reserve_bp_slot(struct perf_event *bp);
88 extern int dbg_release_bp_slot(struct perf_event *bp);
89 extern int reserve_bp_slot(struct perf_event *bp);
90 extern void release_bp_slot(struct perf_event *bp);
92 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
94 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
99 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
101 static inline struct perf_event *
102 register_user_hw_breakpoint(struct perf_event_attr *attr,
103 perf_overflow_handler_t triggered,
104 struct task_struct *tsk) { return NULL; }
106 modify_user_hw_breakpoint(struct perf_event *bp,
107 struct perf_event_attr *attr) { return -ENOSYS; }
108 static inline struct perf_event *
109 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
110 perf_overflow_handler_t triggered,
111 int cpu) { return NULL; }
112 static inline struct perf_event * __percpu *
113 register_wide_hw_breakpoint(struct perf_event_attr *attr,
114 perf_overflow_handler_t triggered) { return NULL; }
116 register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
118 __register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
119 static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
121 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
123 reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
124 static inline void release_bp_slot(struct perf_event *bp) { }
126 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
128 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
133 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
134 #endif /* __KERNEL__ */
136 #endif /* _LINUX_HW_BREAKPOINT_H */