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