summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/debugreg.h
blob: 4505ac2735adf204efed798ecaca93eef2865d29 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_DEBUGREG_H
#define _ASM_X86_DEBUGREG_H


#include <linux/bug.h>
#include <uapi/asm/debugreg.h>

DECLARE_PER_CPU(unsigned long, cpu_dr7);

#ifndef CONFIG_PARAVIRT
/*
 * These special macros can be used to get or set a debugging register
 */
#define get_debugreg(var, register)				\
	(var) = native_get_debugreg(register)
#define set_debugreg(value, register)				\
	native_set_debugreg(register, value)
#endif

static inline unsigned long native_get_debugreg(int regno)
{
	unsigned long val = 0;	/* Damn you, gcc! */

	switch (regno) {
	case 0:
		asm("mov %%db0, %0" :"=r" (val));
		break;
	case 1:
		asm("mov %%db1, %0" :"=r" (val));
		break;
	case 2:
		asm("mov %%db2, %0" :"=r" (val));
		break;
	case 3:
		asm("mov %%db3, %0" :"=r" (val));
		break;
	case 6:
		asm("mov %%db6, %0" :"=r" (val));
		break;
	case 7:
		asm("mov %%db7, %0" :"=r" (val));
		break;
	default:
		BUG();
	}
	return val;
}

static inline void native_set_debugreg(int regno, unsigned long value)
{
	switch (regno) {
	case 0:
		asm("mov %0, %%db0"	::"r" (value));
		break;
	case 1:
		asm("mov %0, %%db1"	::"r" (value));
		break;
	case 2:
		asm("mov %0, %%db2"	::"r" (value));
		break;
	case 3:
		asm("mov %0, %%db3"	::"r" (value));
		break;
	case 6:
		asm("mov %0, %%db6"	::"r" (value));
		break;
	case 7:
		asm("mov %0, %%db7"	::"r" (value));
		break;
	default:
		BUG();
	}
}

static inline void hw_breakpoint_disable(void)
{
	/* Zero the control register for HW Breakpoint */
	set_debugreg(0UL, 7);

	/* Zero-out the individual HW breakpoint address registers */
	set_debugreg(0UL, 0);
	set_debugreg(0UL, 1);
	set_debugreg(0UL, 2);
	set_debugreg(0UL, 3);
}

static inline int hw_breakpoint_active(void)
{
	return __this_cpu_read(cpu_dr7) & DR_GLOBAL_ENABLE_MASK;
}

extern void aout_dump_debugregs(struct user *dump);

extern void hw_breakpoint_restore(void);

#ifdef CONFIG_X86_64
DECLARE_PER_CPU(int, debug_stack_usage);
static inline void debug_stack_usage_inc(void)
{
	__this_cpu_inc(debug_stack_usage);
}
static inline void debug_stack_usage_dec(void)
{
	__this_cpu_dec(debug_stack_usage);
}
int is_debug_stack(unsigned long addr);
void debug_stack_set_zero(void);
void debug_stack_reset(void);
#else /* !X86_64 */
static inline int is_debug_stack(unsigned long addr) { return 0; }
static inline void debug_stack_set_zero(void) { }
static inline void debug_stack_reset(void) { }
static inline void debug_stack_usage_inc(void) { }
static inline void debug_stack_usage_dec(void) { }
#endif /* X86_64 */

#ifdef CONFIG_CPU_SUP_AMD
extern void set_dr_addr_mask(unsigned long mask, int dr);
#else
static inline void set_dr_addr_mask(unsigned long mask, int dr) { }
#endif

#endif /* _ASM_X86_DEBUGREG_H */