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gerrit-public.fairphone.software / kernel / msm-4.19 / e5b5341c28c66a122982d3d8822a4f9a0938f923 / . / arch / x86 / include / asm / debugreg.h
blob: 61fd18b83b6c6af777f2cdd2a63d943089de55e1 [file] [log] [blame]
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700[diff] [blame]1#ifndef _ASM_X86_DEBUGREG_H
2#define _ASM_X86_DEBUGREG_H
Thomas Gleixner21ebddd2007-10-17 20:35:37 +0200[diff] [blame]3
4
Paul Gortmakerf649e932012-01-20 16:24:09 -0500[diff] [blame]5#include <linux/bug.h>
David Howellsaf170c52012-12-14 22:37:13 +0000[diff] [blame]6#include <uapi/asm/debugreg.h>
Paul Gortmakerf649e932012-01-20 16:24:09 -0500[diff] [blame]7
Tejun Heo28b4e0d2009-11-25 22:24:44 +0900[diff] [blame]8DECLARE_PER_CPU(unsigned long, cpu_dr7);
K.Prasadb332828c2009-06-01 23:43:10 +0530[diff] [blame]9
Paul Gortmakerf649e932012-01-20 16:24:09 -0500[diff] [blame]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
20static 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
49static 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
K.Prasadb332828c2009-06-01 23:43:10 +0530[diff] [blame]75static 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
Frederic Weisbecker59d8eb52009-11-10 11:03:12 +0100[diff] [blame]87static inline int hw_breakpoint_active(void)
88{
Tejun Heo0a3aee02010-12-18 16:28:55 +0100[diff] [blame]89 return __this_cpu_read(cpu_dr7) & DR_GLOBAL_ENABLE_MASK;
Frederic Weisbecker59d8eb52009-11-10 11:03:12 +0100[diff] [blame]90}
91
Frederic Weisbecker9f6b3c22009-11-09 21:03:43 +0100[diff] [blame]92extern void aout_dump_debugregs(struct user *dump);
93
Frederic Weisbecker24f1e32c2009-09-09 19:22:48 +0200[diff] [blame]94extern void hw_breakpoint_restore(void);
Frederic Weisbecker24f1e32c2009-09-09 19:22:48 +0200[diff] [blame]95
Steven Rostedt42181182011-12-16 11:43:02 -0500[diff] [blame]96#ifdef CONFIG_X86_64
97DECLARE_PER_CPU(int, debug_stack_usage);
98static inline void debug_stack_usage_inc(void)
99{
Christoph Lameter89cbc762014-08-17 12:30:40 -0500[diff] [blame]100 __this_cpu_inc(debug_stack_usage);
Steven Rostedt42181182011-12-16 11:43:02 -0500[diff] [blame]101}
102static inline void debug_stack_usage_dec(void)
103{
Christoph Lameter89cbc762014-08-17 12:30:40 -0500[diff] [blame]104 __this_cpu_dec(debug_stack_usage);
Steven Rostedt42181182011-12-16 11:43:02 -0500[diff] [blame]105}
106int is_debug_stack(unsigned long addr);
107void debug_stack_set_zero(void);
108void debug_stack_reset(void);
109#else /* !X86_64 */
110static inline int is_debug_stack(unsigned long addr) { return 0; }
111static inline void debug_stack_set_zero(void) { }
112static inline void debug_stack_reset(void) { }
113static inline void debug_stack_usage_inc(void) { }
114static inline void debug_stack_usage_dec(void) { }
115#endif /* X86_64 */
116
117
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700[diff] [blame]118#endif /* _ASM_X86_DEBUGREG_H */