1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_DEBUGREG_H
3#define _ASM_X86_DEBUGREG_H
4
5
6#include <linux/bug.h>
7#include <uapi/asm/debugreg.h>
8
9DECLARE_PER_CPU(unsigned long, cpu_dr7);
10
11#ifndef CONFIG_PARAVIRT_XXL
12/*
13 * These special macros can be used to get or set a debugging register
14 */
15#define get_debugreg(var, register) \
16 (var) = native_get_debugreg(register)
17#define set_debugreg(value, register) \
18 native_set_debugreg(register, value)
19#endif
20
21static inline unsigned long native_get_debugreg(int regno)
22{
23 unsigned long val = 0; /* Damn you, gcc! */
24
25 switch (regno) {
26 case 0:
27 asm("mov %%db0, %0" :"=r" (val));
28 break;
29 case 1:
30 asm("mov %%db1, %0" :"=r" (val));
31 break;
32 case 2:
33 asm("mov %%db2, %0" :"=r" (val));
34 break;
35 case 3:
36 asm("mov %%db3, %0" :"=r" (val));
37 break;
38 case 6:
39 asm("mov %%db6, %0" :"=r" (val));
40 break;
41 case 7:
42 asm("mov %%db7, %0" :"=r" (val));
43 break;
44 default:
45 BUG();
46 }
47 return val;
48}
49
50static inline void native_set_debugreg(int regno, unsigned long value)
51{
52 switch (regno) {
53 case 0:
54 asm("mov %0, %%db0" ::"r" (value));
55 break;
56 case 1:
57 asm("mov %0, %%db1" ::"r" (value));
58 break;
59 case 2:
60 asm("mov %0, %%db2" ::"r" (value));
61 break;
62 case 3:
63 asm("mov %0, %%db3" ::"r" (value));
64 break;
65 case 6:
66 asm("mov %0, %%db6" ::"r" (value));
67 break;
68 case 7:
69 asm("mov %0, %%db7" ::"r" (value));
70 break;
71 default:
72 BUG();
73 }
74}
75
76static inline void hw_breakpoint_disable(void)
77{
78 /* Zero the control register for HW Breakpoint */
79 set_debugreg(0UL, 7);
80
81 /* Zero-out the individual HW breakpoint address registers */
82 set_debugreg(0UL, 0);
83 set_debugreg(0UL, 1);
84 set_debugreg(0UL, 2);
85 set_debugreg(0UL, 3);
86}
87
88static inline int hw_breakpoint_active(void)
89{
90 return __this_cpu_read(cpu_dr7) & DR_GLOBAL_ENABLE_MASK;
91}
92
93extern void aout_dump_debugregs(struct user *dump);
94
95extern void hw_breakpoint_restore(void);
96
97#ifdef CONFIG_X86_64
98DECLARE_PER_CPU(int, debug_stack_usage);
99static inline void debug_stack_usage_inc(void)
100{
101 __this_cpu_inc(debug_stack_usage);
102}
103static inline void debug_stack_usage_dec(void)
104{
105 __this_cpu_dec(debug_stack_usage);
106}
107int is_debug_stack(unsigned long addr);
108void debug_stack_set_zero(void);
109void debug_stack_reset(void);
110#else /* !X86_64 */
111static inline int is_debug_stack(unsigned long addr) { return 0; }
112static inline void debug_stack_set_zero(void) { }
113static inline void debug_stack_reset(void) { }
114static inline void debug_stack_usage_inc(void) { }
115static inline void debug_stack_usage_dec(void) { }
116#endif /* X86_64 */
117
118#ifdef CONFIG_CPU_SUP_AMD
119extern void set_dr_addr_mask(unsigned long mask, int dr);
120#else
121static inline void set_dr_addr_mask(unsigned long mask, int dr) { }
122#endif
123
124#endif /* _ASM_X86_DEBUGREG_H */
125