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
|
#include <linux/linkage.h>
#include <linux/errno.h>
#include <asm/dwarf2.h>
#include <asm/asm.h>
#include <asm/msr.h>
#ifdef CONFIG_X86_64
/*
* int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
*
* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
*
*/
.macro op_safe_regs op
ENTRY(native_\op\()_safe_regs)
CFI_STARTPROC
pushq_cfi %rbx
pushq_cfi %rbp
movq %rdi, %r10 /* Save pointer */
xorl %r11d, %r11d /* Return value */
movl (%rdi), %eax
movl 4(%rdi), %ecx
movl 8(%rdi), %edx
movl 12(%rdi), %ebx
movl 20(%rdi), %ebp
movl 24(%rdi), %esi
movl 28(%rdi), %edi
CFI_REMEMBER_STATE
1: \op
2: movl %eax, (%r10)
movl %r11d, %eax /* Return value */
movl %ecx, 4(%r10)
movl %edx, 8(%r10)
movl %ebx, 12(%r10)
movl %ebp, 20(%r10)
movl %esi, 24(%r10)
movl %edi, 28(%r10)
popq_cfi %rbp
popq_cfi %rbx
ret
3:
CFI_RESTORE_STATE
movl $-EIO, %r11d
jmp 2b
_ASM_EXTABLE(1b, 3b)
CFI_ENDPROC
ENDPROC(native_\op\()_safe_regs)
.endm
#else /* X86_32 */
.macro op_safe_regs op
ENTRY(native_\op\()_safe_regs)
CFI_STARTPROC
pushl_cfi %ebx
pushl_cfi %ebp
pushl_cfi %esi
pushl_cfi %edi
pushl_cfi $0 /* Return value */
pushl_cfi %eax
movl 4(%eax), %ecx
movl 8(%eax), %edx
movl 12(%eax), %ebx
movl 20(%eax), %ebp
movl 24(%eax), %esi
movl 28(%eax), %edi
movl (%eax), %eax
CFI_REMEMBER_STATE
1: \op
2: pushl_cfi %eax
movl 4(%esp), %eax
popl_cfi (%eax)
addl $4, %esp
CFI_ADJUST_CFA_OFFSET -4
movl %ecx, 4(%eax)
movl %edx, 8(%eax)
movl %ebx, 12(%eax)
movl %ebp, 20(%eax)
movl %esi, 24(%eax)
movl %edi, 28(%eax)
popl_cfi %eax
popl_cfi %edi
popl_cfi %esi
popl_cfi %ebp
popl_cfi %ebx
ret
3:
CFI_RESTORE_STATE
movl $-EIO, 4(%esp)
jmp 2b
_ASM_EXTABLE(1b, 3b)
CFI_ENDPROC
ENDPROC(native_\op\()_safe_regs)
.endm
#endif
op_safe_regs rdmsr
op_safe_regs wrmsr
|
