tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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
36static inline void hw_breakpoint_init(struct perf_event_attr *attr)
37{
38 memset(attr, 0, sizeof(*attr));
39
40 attr->type = PERF_TYPE_BREAKPOINT;
41 attr->size = sizeof(*attr);
42 /*
43 * As it's for in-kernel or ptrace use, we want it to be pinned
44 * and to call its callback every hits.
45 */
46 attr->pinned = 1;
47 attr->sample_period = 1;
48}
49
50static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
51{
52 hw_breakpoint_init(attr);
53 attr->exclude_kernel = 1;
54}
55
56static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
57{
58 return bp->attr.bp_addr;
59}
60
61static inline int hw_breakpoint_type(struct perf_event *bp)
62{
63 return bp->attr.bp_type;
64}
65
66static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
67{
68 return bp->attr.bp_len;
69}
70
71extern struct perf_event *
72register_user_hw_breakpoint(struct perf_event_attr *attr,
73 perf_overflow_handler_t triggered,
74 struct task_struct *tsk);
75
76/* FIXME: only change from the attr, and don't unregister */
77extern int
78modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
79
80/*
81 * Kernel breakpoints are not associated with any particular thread.
82 */
83extern struct perf_event *
84register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
85 perf_overflow_handler_t triggered,
86 int cpu);
87
88extern struct perf_event * __percpu *
89register_wide_hw_breakpoint(struct perf_event_attr *attr,
90 perf_overflow_handler_t triggered);
91
92extern int register_perf_hw_breakpoint(struct perf_event *bp);
93extern int __register_perf_hw_breakpoint(struct perf_event *bp);
94extern void unregister_hw_breakpoint(struct perf_event *bp);
95extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
96
97extern int dbg_reserve_bp_slot(struct perf_event *bp);
98extern int dbg_release_bp_slot(struct perf_event *bp);
99extern int reserve_bp_slot(struct perf_event *bp);
100extern void release_bp_slot(struct perf_event *bp);
101
102extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
103
104static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
105{
106 return &bp->hw.info;
107}
108
109#else /* !CONFIG_HAVE_HW_BREAKPOINT */
110
111static inline struct perf_event *
112register_user_hw_breakpoint(struct perf_event_attr *attr,
113 perf_overflow_handler_t triggered,
114 struct task_struct *tsk) { return NULL; }
115static inline int
116modify_user_hw_breakpoint(struct perf_event *bp,
117 struct perf_event_attr *attr) { return -ENOSYS; }
118static inline struct perf_event *
119register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
120 perf_overflow_handler_t triggered,
121 int cpu) { return NULL; }
122static inline struct perf_event * __percpu *
123register_wide_hw_breakpoint(struct perf_event_attr *attr,
124 perf_overflow_handler_t triggered) { return NULL; }
125static inline int
126register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
127static inline int
128__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
129static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
130static inline void
131unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
132static inline int
133reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
134static inline void release_bp_slot(struct perf_event *bp) { }
135
136static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
137
138static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
139{
140 return NULL;
141}
142
143#endif /* CONFIG_HAVE_HW_BREAKPOINT */
144#endif /* __KERNEL__ */
145
146#endif /* _LINUX_HW_BREAKPOINT_H */