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