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