1
2#ifndef _LINUX_HW_BREAKPOINT_H
3#define _LINUX_HW_BREAKPOINT_H
4
5#include <linux/perf_event.h>
6#include <uapi/linux/hw_breakpoint.h>
7
8#ifdef CONFIG_HAVE_HW_BREAKPOINT
9
10extern int __init init_hw_breakpoint(void);
11
12static inline void hw_breakpoint_init(struct perf_event_attr *attr)
13{
14 memset(attr, 0, sizeof(*attr));
15
16 attr->type = PERF_TYPE_BREAKPOINT;
17 attr->size = sizeof(*attr);
18
19
20
21
22 attr->pinned = 1;
23 attr->sample_period = 1;
24}
25
26static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
27{
28 hw_breakpoint_init(attr);
29 attr->exclude_kernel = 1;
30}
31
32static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
33{
34 return bp->attr.bp_addr;
35}
36
37static inline int hw_breakpoint_type(struct perf_event *bp)
38{
39 return bp->attr.bp_type;
40}
41
42static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
43{
44 return bp->attr.bp_len;
45}
46
47extern struct perf_event *
48register_user_hw_breakpoint(struct perf_event_attr *attr,
49 perf_overflow_handler_t triggered,
50 void *context,
51 struct task_struct *tsk);
52
53
54extern int
55modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
56
57
58
59
60extern struct perf_event *
61register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
62 perf_overflow_handler_t triggered,
63 void *context,
64 int cpu);
65
66extern struct perf_event * __percpu *
67register_wide_hw_breakpoint(struct perf_event_attr *attr,
68 perf_overflow_handler_t triggered,
69 void *context);
70
71extern int register_perf_hw_breakpoint(struct perf_event *bp);
72extern int __register_perf_hw_breakpoint(struct perf_event *bp);
73extern void unregister_hw_breakpoint(struct perf_event *bp);
74extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
75
76extern int dbg_reserve_bp_slot(struct perf_event *bp);
77extern int dbg_release_bp_slot(struct perf_event *bp);
78extern int reserve_bp_slot(struct perf_event *bp);
79extern void release_bp_slot(struct perf_event *bp);
80
81extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
82
83static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
84{
85 return &bp->hw.info;
86}
87
88#else
89
90static inline int __init init_hw_breakpoint(void) { return 0; }
91
92static inline struct perf_event *
93register_user_hw_breakpoint(struct perf_event_attr *attr,
94 perf_overflow_handler_t triggered,
95 void *context,
96 struct task_struct *tsk) { return NULL; }
97static inline int
98modify_user_hw_breakpoint(struct perf_event *bp,
99 struct perf_event_attr *attr) { return -ENOSYS; }
100static inline struct perf_event *
101register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
102 perf_overflow_handler_t triggered,
103 void *context,
104 int cpu) { return NULL; }
105static inline struct perf_event * __percpu *
106register_wide_hw_breakpoint(struct perf_event_attr *attr,
107 perf_overflow_handler_t triggered,
108 void *context) { return NULL; }
109static inline int
110register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
111static inline int
112__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
113static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
114static inline void
115unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
116static inline int
117reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
118static inline void release_bp_slot(struct perf_event *bp) { }
119
120static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
121
122static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
123{
124 return NULL;
125}
126
127#endif
128#endif
129