1 #ifndef _I386_HW_BREAKPOINT_H
2 #define _I386_HW_BREAKPOINT_H
3
4 #ifdef __KERNEL__
5 #define __ARCH_HW_BREAKPOINT_H
6
7 /*
8 * The name should probably be something dealt in
9 * a higher level. While dealing with the user
10 * (display/resolving)
11 */
12 struct arch_hw_breakpoint {
13 unsigned long address;
14 u8 len;
15 u8 type;
16 };
17
18 #include <linux/kdebug.h>
19 #include <linux/percpu.h>
20 #include <linux/list.h>
21
22 /* Available HW breakpoint length encodings */
23 #define X86_BREAKPOINT_LEN_X 0x40
24 #define X86_BREAKPOINT_LEN_1 0x40
25 #define X86_BREAKPOINT_LEN_2 0x44
26 #define X86_BREAKPOINT_LEN_4 0x4c
27
28 #ifdef CONFIG_X86_64
29 #define X86_BREAKPOINT_LEN_8 0x48
30 #endif
31
32 /* Available HW breakpoint type encodings */
33
34 /* trigger on instruction execute */
35 #define X86_BREAKPOINT_EXECUTE 0x80
36 /* trigger on memory write */
37 #define X86_BREAKPOINT_WRITE 0x81
38 /* trigger on memory read or write */
39 #define X86_BREAKPOINT_RW 0x83
40
41 /* Total number of available HW breakpoint registers */
42 #define HBP_NUM 4
43
hw_breakpoint_slots(int type)44 static inline int hw_breakpoint_slots(int type)
45 {
46 return HBP_NUM;
47 }
48
49 struct perf_event;
50 struct pmu;
51
52 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
53 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
54 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
55 unsigned long val, void *data);
56
57
58 int arch_install_hw_breakpoint(struct perf_event *bp);
59 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
60 void hw_breakpoint_pmu_read(struct perf_event *bp);
61 void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
62
63 extern void
64 arch_fill_perf_breakpoint(struct perf_event *bp);
65
66 unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
67 int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
68
69 extern int arch_bp_generic_fields(int x86_len, int x86_type,
70 int *gen_len, int *gen_type);
71
72 extern struct pmu perf_ops_bp;
73
74 #endif /* __KERNEL__ */
75 #endif /* _I386_HW_BREAKPOINT_H */
76
77