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1 | #ifndef _LINUX_HW_BREAKPOINT_H | |
2 | #define _LINUX_HW_BREAKPOINT_H | |
3 | ||
4 | enum { | |
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 | ||
11 | enum { | |
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 | ||
20 | enum 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 | ||
36 | extern int __init init_hw_breakpoint(void); | |
37 | ||
38 | static 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 | ||
52 | static inline void ptrace_breakpoint_init(struct perf_event_attr *attr) | |
53 | { | |
54 | hw_breakpoint_init(attr); | |
55 | attr->exclude_kernel = 1; | |
56 | } | |
57 | ||
58 | static inline unsigned long hw_breakpoint_addr(struct perf_event *bp) | |
59 | { | |
60 | return bp->attr.bp_addr; | |
61 | } | |
62 | ||
63 | static inline int hw_breakpoint_type(struct perf_event *bp) | |
64 | { | |
65 | return bp->attr.bp_type; | |
66 | } | |
67 | ||
68 | static inline unsigned long hw_breakpoint_len(struct perf_event *bp) | |
69 | { | |
70 | return bp->attr.bp_len; | |
71 | } | |
72 | ||
73 | extern struct perf_event * | |
74 | register_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 */ | |
80 | extern int | |
81 | modify_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 | */ | |
86 | extern struct perf_event * | |
87 | register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, | |
88 | perf_overflow_handler_t triggered, | |
89 | void *context, | |
90 | int cpu); | |
91 | ||
92 | extern struct perf_event * __percpu * | |
93 | register_wide_hw_breakpoint(struct perf_event_attr *attr, | |
94 | perf_overflow_handler_t triggered, | |
95 | void *context); | |
96 | ||
97 | extern int register_perf_hw_breakpoint(struct perf_event *bp); | |
98 | extern int __register_perf_hw_breakpoint(struct perf_event *bp); | |
99 | extern void unregister_hw_breakpoint(struct perf_event *bp); | |
100 | extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events); | |
101 | ||
102 | extern int dbg_reserve_bp_slot(struct perf_event *bp); | |
103 | extern int dbg_release_bp_slot(struct perf_event *bp); | |
104 | extern int reserve_bp_slot(struct perf_event *bp); | |
105 | extern void release_bp_slot(struct perf_event *bp); | |
106 | ||
107 | extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); | |
108 | ||
109 | static 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 | ||
116 | static inline int __init init_hw_breakpoint(void) { return 0; } | |
117 | ||
118 | static inline struct perf_event * | |
119 | register_user_hw_breakpoint(struct perf_event_attr *attr, | |
120 | perf_overflow_handler_t triggered, | |
121 | void *context, | |
122 | struct task_struct *tsk) { return NULL; } | |
123 | static inline int | |
124 | modify_user_hw_breakpoint(struct perf_event *bp, | |
125 | struct perf_event_attr *attr) { return -ENOSYS; } | |
126 | static inline struct perf_event * | |
127 | register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, | |
128 | perf_overflow_handler_t triggered, | |
129 | void *context, | |
130 | int cpu) { return NULL; } | |
131 | static inline struct perf_event * __percpu * | |
132 | register_wide_hw_breakpoint(struct perf_event_attr *attr, | |
133 | perf_overflow_handler_t triggered, | |
134 | void *context) { return NULL; } | |
135 | static inline int | |
136 | register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } | |
137 | static inline int | |
138 | __register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } | |
139 | static inline void unregister_hw_breakpoint(struct perf_event *bp) { } | |
140 | static inline void | |
141 | unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { } | |
142 | static inline int | |
143 | reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; } | |
144 | static inline void release_bp_slot(struct perf_event *bp) { } | |
145 | ||
146 | static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { } | |
147 | ||
148 | static 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 */ |