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