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 extern int __init init_hw_breakpoint(void);
38 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
40 memset(attr, 0, sizeof(*attr));
42 attr->type = PERF_TYPE_BREAKPOINT;
43 attr->size = sizeof(*attr);
45 * As it's for in-kernel or ptrace use, we want it to be pinned
46 * and to call its callback every hits.
49 attr->sample_period = 1;
52 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
54 hw_breakpoint_init(attr);
55 attr->exclude_kernel = 1;
58 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
60 return bp->attr.bp_addr;
63 static inline int hw_breakpoint_type(struct perf_event *bp)
65 return bp->attr.bp_type;
68 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
70 return bp->attr.bp_len;
73 extern struct perf_event *
74 register_user_hw_breakpoint(struct perf_event_attr *attr,
75 perf_overflow_handler_t triggered,
76 struct task_struct *tsk);
78 /* FIXME: only change from the attr, and don't unregister */
80 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
83 * Kernel breakpoints are not associated with any particular thread.
85 extern struct perf_event *
86 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
87 perf_overflow_handler_t triggered,
90 extern struct perf_event * __percpu *
91 register_wide_hw_breakpoint(struct perf_event_attr *attr,
92 perf_overflow_handler_t triggered);
94 extern int register_perf_hw_breakpoint(struct perf_event *bp);
95 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
96 extern void unregister_hw_breakpoint(struct perf_event *bp);
97 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
99 extern int dbg_reserve_bp_slot(struct perf_event *bp);
100 extern int dbg_release_bp_slot(struct perf_event *bp);
101 extern int reserve_bp_slot(struct perf_event *bp);
102 extern void release_bp_slot(struct perf_event *bp);
104 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
106 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
111 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
113 static inline int __init init_hw_breakpoint(void) { return 0; }
115 static inline struct perf_event *
116 register_user_hw_breakpoint(struct perf_event_attr *attr,
117 perf_overflow_handler_t triggered,
118 struct task_struct *tsk) { return NULL; }
120 modify_user_hw_breakpoint(struct perf_event *bp,
121 struct perf_event_attr *attr) { return -ENOSYS; }
122 static inline struct perf_event *
123 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
124 perf_overflow_handler_t triggered,
125 int cpu) { return NULL; }
126 static inline struct perf_event * __percpu *
127 register_wide_hw_breakpoint(struct perf_event_attr *attr,
128 perf_overflow_handler_t triggered) { return NULL; }
130 register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
132 __register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
133 static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
135 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
137 reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
138 static inline void release_bp_slot(struct perf_event *bp) { }
140 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
142 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
147 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
148 #endif /* __KERNEL__ */
150 #endif /* _LINUX_HW_BREAKPOINT_H */