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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef _LINUX_HW_BREAKPOINT_H
2#define _LINUX_HW_BREAKPOINT_H
3
4enum {
5 HW_BREAKPOINT_LEN_1 = 1,
6 HW_BREAKPOINT_LEN_2 = 2,
7 HW_BREAKPOINT_LEN_4 = 4,
8 HW_BREAKPOINT_LEN_8 = 8,
9};
10
11enum {
12 HW_BREAKPOINT_R = 1,
13 HW_BREAKPOINT_W = 2,
14 HW_BREAKPOINT_X = 4,
15};
16
17#ifdef __KERNEL__
18
19#include <linux/perf_event.h>
20
21#ifdef CONFIG_HAVE_HW_BREAKPOINT
22
23static inline void hw_breakpoint_init(struct perf_event_attr *attr)
24{
25 memset(attr, 0, sizeof(*attr));
26
27 attr->type = PERF_TYPE_BREAKPOINT;
28 attr->size = sizeof(*attr);
29 /*
30 * As it's for in-kernel or ptrace use, we want it to be pinned
31 * and to call its callback every hits.
32 */
33 attr->pinned = 1;
34 attr->sample_period = 1;
35}
36
37static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
38{
39 return bp->attr.bp_addr;
40}
41
42static inline int hw_breakpoint_type(struct perf_event *bp)
43{
44 return bp->attr.bp_type;
45}
46
47static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
48{
49 return bp->attr.bp_len;
50}
51
52extern struct perf_event *
53register_user_hw_breakpoint(struct perf_event_attr *attr,
54 perf_overflow_handler_t triggered,
55 struct task_struct *tsk);
56
57/* FIXME: only change from the attr, and don't unregister */
58extern int
59modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
60
61/*
62 * Kernel breakpoints are not associated with any particular thread.
63 */
64extern struct perf_event *
65register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
66 perf_overflow_handler_t triggered,
67 int cpu);
68
69extern struct perf_event **
70register_wide_hw_breakpoint(struct perf_event_attr *attr,
71 perf_overflow_handler_t triggered);
72
73extern int register_perf_hw_breakpoint(struct perf_event *bp);
74extern int __register_perf_hw_breakpoint(struct perf_event *bp);
75extern void unregister_hw_breakpoint(struct perf_event *bp);
76extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
77
78extern int dbg_reserve_bp_slot(struct perf_event *bp);
79extern int dbg_release_bp_slot(struct perf_event *bp);
80extern int reserve_bp_slot(struct perf_event *bp);
81extern void release_bp_slot(struct perf_event *bp);
82
83extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
84
85static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
86{
87 return &bp->hw.info;
88}
89
90#else /* !CONFIG_HAVE_HW_BREAKPOINT */
91
92static inline struct perf_event *
93register_user_hw_breakpoint(struct perf_event_attr *attr,
94 perf_overflow_handler_t triggered,
95 struct task_struct *tsk) { return NULL; }
96static inline int
97modify_user_hw_breakpoint(struct perf_event *bp,
98 struct perf_event_attr *attr) { return -ENOSYS; }
99static inline struct perf_event *
100register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
101 perf_overflow_handler_t triggered,
102 int cpu) { return NULL; }
103static inline struct perf_event **
104register_wide_hw_breakpoint(struct perf_event_attr *attr,
105 perf_overflow_handler_t triggered) { return NULL; }
106static inline int
107register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
108static inline int
109__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
110static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
111static inline void
112unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
113static inline int
114reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
115static inline void release_bp_slot(struct perf_event *bp) { }
116
117static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
118
119static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
120{
121 return NULL;
122}
123
124#endif /* CONFIG_HAVE_HW_BREAKPOINT */
125#endif /* __KERNEL__ */
126
127#endif /* _LINUX_HW_BREAKPOINT_H */