Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/lib/msr-reg.S
10818 views
1
#include <linux/linkage.h>

2
#include <linux/errno.h>

3
#include <asm/dwarf2.h>

4
#include <asm/asm.h>

5
#include <asm/msr.h>

6


7
#ifdef CONFIG_X86_64

8
/*

9
 * int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]);

10
 *

11
 * reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]

12
 *

13
 */

14
.macro op_safe_regs op

15
ENTRY(native_\op\()_safe_regs)

16
	CFI_STARTPROC

17
	pushq_cfi %rbx

18
	pushq_cfi %rbp

19
	movq	%rdi, %r10	/* Save pointer */

20
	xorl	%r11d, %r11d	/* Return value */

21
	movl    (%rdi), %eax

22
	movl    4(%rdi), %ecx

23
	movl    8(%rdi), %edx

24
	movl    12(%rdi), %ebx

25
	movl    20(%rdi), %ebp

26
	movl    24(%rdi), %esi

27
	movl    28(%rdi), %edi

28
	CFI_REMEMBER_STATE

29
1:	\op

30
2:	movl    %eax, (%r10)

31
	movl	%r11d, %eax	/* Return value */

32
	movl    %ecx, 4(%r10)

33
	movl    %edx, 8(%r10)

34
	movl    %ebx, 12(%r10)

35
	movl    %ebp, 20(%r10)

36
	movl    %esi, 24(%r10)

37
	movl    %edi, 28(%r10)

38
	popq_cfi %rbp

39
	popq_cfi %rbx

40
	ret

41
3:

42
	CFI_RESTORE_STATE

43
	movl    $-EIO, %r11d

44
	jmp     2b

45


46
	_ASM_EXTABLE(1b, 3b)

47
	CFI_ENDPROC

48
ENDPROC(native_\op\()_safe_regs)

49
.endm

50


51
#else /* X86_32 */

52


53
.macro op_safe_regs op

54
ENTRY(native_\op\()_safe_regs)

55
	CFI_STARTPROC

56
	pushl_cfi %ebx

57
	pushl_cfi %ebp

58
	pushl_cfi %esi

59
	pushl_cfi %edi

60
	pushl_cfi $0              /* Return value */

61
	pushl_cfi %eax

62
	movl    4(%eax), %ecx

63
	movl    8(%eax), %edx

64
	movl    12(%eax), %ebx

65
	movl    20(%eax), %ebp

66
	movl    24(%eax), %esi

67
	movl    28(%eax), %edi

68
	movl    (%eax), %eax

69
	CFI_REMEMBER_STATE

70
1:	\op

71
2:	pushl_cfi %eax

72
	movl    4(%esp), %eax

73
	popl_cfi (%eax)

74
	addl    $4, %esp

75
	CFI_ADJUST_CFA_OFFSET -4

76
	movl    %ecx, 4(%eax)

77
	movl    %edx, 8(%eax)

78
	movl    %ebx, 12(%eax)

79
	movl    %ebp, 20(%eax)

80
	movl    %esi, 24(%eax)

81
	movl    %edi, 28(%eax)

82
	popl_cfi %eax

83
	popl_cfi %edi

84
	popl_cfi %esi

85
	popl_cfi %ebp

86
	popl_cfi %ebx

87
	ret

88
3:

89
	CFI_RESTORE_STATE

90
	movl    $-EIO, 4(%esp)

91
	jmp     2b

92


93
	_ASM_EXTABLE(1b, 3b)

94
	CFI_ENDPROC

95
ENDPROC(native_\op\()_safe_regs)

96
.endm

97


98
#endif

99


100
op_safe_regs rdmsr

101
op_safe_regs wrmsr

102


103


104