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
hw_breakpoint_init(struct perf_event_attr * attr)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
ptrace_breakpoint_init(struct perf_event_attr * attr)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
hw_breakpoint_addr(struct perf_event * bp)58 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
59 {
60 return bp->attr.bp_addr;
61 }
62
hw_breakpoint_type(struct perf_event * bp)63 static inline int hw_breakpoint_type(struct perf_event *bp)
64 {
65 return bp->attr.bp_type;
66 }
67
hw_breakpoint_len(struct perf_event * bp)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
counter_arch_bp(struct perf_event * bp)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
init_hw_breakpoint(void)116 static inline int __init init_hw_breakpoint(void) { return 0; }
117
118 static inline struct perf_event *
register_user_hw_breakpoint(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context,struct task_struct * tsk)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
modify_user_hw_breakpoint(struct perf_event * bp,struct perf_event_attr * attr)124 modify_user_hw_breakpoint(struct perf_event *bp,
125 struct perf_event_attr *attr) { return -ENOSYS; }
126 static inline struct perf_event *
register_wide_hw_breakpoint_cpu(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context,int cpu)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 *
register_wide_hw_breakpoint(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context)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
register_perf_hw_breakpoint(struct perf_event * bp)136 register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
137 static inline int
__register_perf_hw_breakpoint(struct perf_event * bp)138 __register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
unregister_hw_breakpoint(struct perf_event * bp)139 static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
140 static inline void
unregister_wide_hw_breakpoint(struct perf_event * __percpu * cpu_events)141 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
142 static inline int
reserve_bp_slot(struct perf_event * bp)143 reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
release_bp_slot(struct perf_event * bp)144 static inline void release_bp_slot(struct perf_event *bp) { }
145
flush_ptrace_hw_breakpoint(struct task_struct * tsk)146 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
147
counter_arch_bp(struct perf_event * bp)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 */
157