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