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
47static inline int hw_breakpoint_slots(int type)
48{
49 return HBP_NUM;
50}
51
52struct perf_event_attr;
53struct perf_event;
54struct pmu;
55
56extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
57extern int hw_breakpoint_arch_parse(struct perf_event *bp,
58 const struct perf_event_attr *attr,
59 struct arch_hw_breakpoint *hw);
60extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
61 unsigned long val, void *data);
62
63
64int arch_install_hw_breakpoint(struct perf_event *bp);
65void arch_uninstall_hw_breakpoint(struct perf_event *bp);
66void hw_breakpoint_pmu_read(struct perf_event *bp);
67void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
68
69extern void
70arch_fill_perf_breakpoint(struct perf_event *bp);
71
72unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
73int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
74
75extern int arch_bp_generic_fields(int x86_len, int x86_type,
76 int *gen_len, int *gen_type);
77
78extern struct pmu perf_ops_bp;
79
80#endif /* _I386_HW_BREAKPOINT_H */
81