1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef	_I386_HW_BREAKPOINT_H
 3#define	_I386_HW_BREAKPOINT_H
 4
 5#include <uapi/asm/hw_breakpoint.h>
 6
 7#define	__ARCH_HW_BREAKPOINT_H
 8
 9/*
10 * The name should probably be something dealt in
11 * a higher level. While dealing with the user
12 * (display/resolving)
13 */
14struct arch_hw_breakpoint {
15	unsigned long	address;
16	unsigned long	mask;
17	u8		len;
18	u8		type;
19};
20
21#include <linux/kdebug.h>
22#include <linux/percpu.h>
23#include <linux/list.h>
24
25/* Available HW breakpoint length encodings */
26#define X86_BREAKPOINT_LEN_X		0x40
27#define X86_BREAKPOINT_LEN_1		0x40
28#define X86_BREAKPOINT_LEN_2		0x44
29#define X86_BREAKPOINT_LEN_4		0x4c
30
31#ifdef CONFIG_X86_64
32#define X86_BREAKPOINT_LEN_8		0x48
33#endif
34
35/* Available HW breakpoint type encodings */
36
37/* trigger on instruction execute */
38#define X86_BREAKPOINT_EXECUTE	0x80
39/* trigger on memory write */
40#define X86_BREAKPOINT_WRITE	0x81
41/* trigger on memory read or write */
42#define X86_BREAKPOINT_RW	0x83
43
44/* Total number of available HW breakpoint registers */
45#define HBP_NUM 4
46
47#define hw_breakpoint_slots(type) (HBP_NUM)
 
 
 
48
49struct perf_event_attr;
50struct perf_event;
51struct pmu;
52
53extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
54extern int hw_breakpoint_arch_parse(struct perf_event *bp,
55				    const struct perf_event_attr *attr,
56				    struct arch_hw_breakpoint *hw);
57extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
58					   unsigned long val, void *data);
59
60
61int arch_install_hw_breakpoint(struct perf_event *bp);
62void arch_uninstall_hw_breakpoint(struct perf_event *bp);
63void hw_breakpoint_pmu_read(struct perf_event *bp);
64void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
65
66extern void
67arch_fill_perf_breakpoint(struct perf_event *bp);
68
69unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
70int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
71
72extern int arch_bp_generic_fields(int x86_len, int x86_type,
73				  int *gen_len, int *gen_type);
74
75extern struct pmu perf_ops_bp;
76
77#endif	/* _I386_HW_BREAKPOINT_H */

 
 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 */