Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 struct task_struct *tsk);
77
78/* FIXME: only change from the attr, and don't unregister */
79extern int
80modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
81
82/*
83 * Kernel breakpoints are not associated with any particular thread.
84 */
85extern struct perf_event *
86register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
87 perf_overflow_handler_t triggered,
88 int cpu);
89
90extern struct perf_event * __percpu *
91register_wide_hw_breakpoint(struct perf_event_attr *attr,
92 perf_overflow_handler_t triggered);
93
94extern int register_perf_hw_breakpoint(struct perf_event *bp);
95extern int __register_perf_hw_breakpoint(struct perf_event *bp);
96extern void unregister_hw_breakpoint(struct perf_event *bp);
97extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
98
99extern int dbg_reserve_bp_slot(struct perf_event *bp);
100extern int dbg_release_bp_slot(struct perf_event *bp);
101extern int reserve_bp_slot(struct perf_event *bp);
102extern void release_bp_slot(struct perf_event *bp);
103
104extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
105
106static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
107{
108 return &bp->hw.info;
109}
110
111#else /* !CONFIG_HAVE_HW_BREAKPOINT */
112
113static inline int __init init_hw_breakpoint(void) { return 0; }
114
115static inline struct perf_event *
116register_user_hw_breakpoint(struct perf_event_attr *attr,
117 perf_overflow_handler_t triggered,
118 struct task_struct *tsk) { return NULL; }
119static inline int
120modify_user_hw_breakpoint(struct perf_event *bp,
121 struct perf_event_attr *attr) { return -ENOSYS; }
122static inline struct perf_event *
123register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
124 perf_overflow_handler_t triggered,
125 int cpu) { return NULL; }
126static inline struct perf_event * __percpu *
127register_wide_hw_breakpoint(struct perf_event_attr *attr,
128 perf_overflow_handler_t triggered) { return NULL; }
129static inline int
130register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
131static inline int
132__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
133static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
134static inline void
135unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
136static inline int
137reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
138static inline void release_bp_slot(struct perf_event *bp) { }
139
140static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
141
142static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
143{
144 return NULL;
145}
146
147#endif /* CONFIG_HAVE_HW_BREAKPOINT */
148#endif /* __KERNEL__ */
149
150#endif /* _LINUX_HW_BREAKPOINT_H */