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
15ENTRY(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
291:	\op
302:	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
413:
42	CFI_RESTORE_STATE
43	movl    $-EIO, %r11d
44	jmp     2b
45
46	_ASM_EXTABLE(1b, 3b)
47	CFI_ENDPROC
48ENDPROC(native_\op\()_safe_regs)
49.endm
50
51#else /* X86_32 */
52
53.macro op_safe_regs op
54ENTRY(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
701:	\op
712:	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
883:
89	CFI_RESTORE_STATE
90	movl    $-EIO, 4(%esp)
91	jmp     2b
92
93	_ASM_EXTABLE(1b, 3b)
94	CFI_ENDPROC
95ENDPROC(native_\op\()_safe_regs)
96.endm
97
98#endif
99
100op_safe_regs rdmsr
101op_safe_regs wrmsr
102
103