Linux kernel mirror (for testing)
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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_EMPTY = 0,
13 HW_BREAKPOINT_R = 1,
14 HW_BREAKPOINT_W = 2,
15 HW_BREAKPOINT_RW = HW_BREAKPOINT_R | HW_BREAKPOINT_W,
16 HW_BREAKPOINT_X = 4,
17 HW_BREAKPOINT_INVALID = HW_BREAKPOINT_RW | HW_BREAKPOINT_X,
18};
19
20enum bp_type_idx {
21 TYPE_INST = 0,
22#ifdef CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
23 TYPE_DATA = 0,
24#else
25 TYPE_DATA = 1,
26#endif
27 TYPE_MAX
28};
29
30#ifdef __KERNEL__
31
32#include <linux/perf_event.h>
33
34#ifdef CONFIG_HAVE_HW_BREAKPOINT
35
36extern int __init init_hw_breakpoint(void);
37
38static inline void hw_breakpoint_init(struct perf_event_attr *attr)
39{
40 memset(attr, 0, sizeof(*attr));
41
42 attr->type = PERF_TYPE_BREAKPOINT;
43 attr->size = sizeof(*attr);
44 /*
45 * As it's for in-kernel or ptrace use, we want it to be pinned
46 * and to call its callback every hits.
47 */
48 attr->pinned = 1;
49 attr->sample_period = 1;
50}
51
52static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
53{
54 hw_breakpoint_init(attr);
55 attr->exclude_kernel = 1;
56}
57
58static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
59{
60 return bp->attr.bp_addr;
61}
62
63static inline int hw_breakpoint_type(struct perf_event *bp)
64{
65 return bp->attr.bp_type;
66}
67
68static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
69{
70 return bp->attr.bp_len;
71}
72
73extern struct perf_event *
74register_user_hw_breakpoint(struct perf_event_attr *attr,
75 perf_overflow_handler_t triggered,
76 void *context,
77 struct task_struct *tsk);
78
79/* FIXME: only change from the attr, and don't unregister */
80extern int
81modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
82
83/*
84 * Kernel breakpoints are not associated with any particular thread.
85 */
86extern struct perf_event *
87register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
88 perf_overflow_handler_t triggered,
89 void *context,
90 int cpu);
91
92extern struct perf_event * __percpu *
93register_wide_hw_breakpoint(struct perf_event_attr *attr,
94 perf_overflow_handler_t triggered,
95 void *context);
96
97extern int register_perf_hw_breakpoint(struct perf_event *bp);
98extern int __register_perf_hw_breakpoint(struct perf_event *bp);
99extern void unregister_hw_breakpoint(struct perf_event *bp);
100extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
101
102extern int dbg_reserve_bp_slot(struct perf_event *bp);
103extern int dbg_release_bp_slot(struct perf_event *bp);
104extern int reserve_bp_slot(struct perf_event *bp);
105extern void release_bp_slot(struct perf_event *bp);
106
107extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
108
109static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
110{
111 return &bp->hw.info;
112}
113
114#else /* !CONFIG_HAVE_HW_BREAKPOINT */
115
116static inline int __init init_hw_breakpoint(void) { return 0; }
117
118static inline struct perf_event *
119register_user_hw_breakpoint(struct perf_event_attr *attr,
120 perf_overflow_handler_t triggered,
121 void *context,
122 struct task_struct *tsk) { return NULL; }
123static inline int
124modify_user_hw_breakpoint(struct perf_event *bp,
125 struct perf_event_attr *attr) { return -ENOSYS; }
126static inline struct perf_event *
127register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
128 perf_overflow_handler_t triggered,
129 void *context,
130 int cpu) { return NULL; }
131static inline struct perf_event * __percpu *
132register_wide_hw_breakpoint(struct perf_event_attr *attr,
133 perf_overflow_handler_t triggered,
134 void *context) { return NULL; }
135static inline int
136register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
137static inline int
138__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
139static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
140static inline void
141unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
142static inline int
143reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
144static inline void release_bp_slot(struct perf_event *bp) { }
145
146static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
147
148static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
149{
150 return NULL;
151}
152
153#endif /* CONFIG_HAVE_HW_BREAKPOINT */
154#endif /* __KERNEL__ */
155
156#endif /* _LINUX_HW_BREAKPOINT_H */