1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/linkage.h>
3#include <linux/errno.h>
4#include <linux/cfi_types.h>
5#include <asm/asm.h>
6#include <asm/msr.h>
7
8#ifdef CONFIG_X86_64
9/*
10 * int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
11 *
12 * reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
13 *
14 */
15.macro op_safe_regs op
16SYM_TYPED_FUNC_START(\op\()_safe_regs)
17 pushq %rbx
18 pushq %r12
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), %r12d
26 movl 24(%rdi), %esi
27 movl 28(%rdi), %edi
281: \op
292: movl %eax, (%r10)
30 movl %r11d, %eax /* Return value */
31 movl %ecx, 4(%r10)
32 movl %edx, 8(%r10)
33 movl %ebx, 12(%r10)
34 movl %r12d, 20(%r10)
35 movl %esi, 24(%r10)
36 movl %edi, 28(%r10)
37 popq %r12
38 popq %rbx
39 RET
403:
41 movl $-EIO, %r11d
42 jmp 2b
43
44 _ASM_EXTABLE(1b, 3b)
45SYM_FUNC_END(\op\()_safe_regs)
46.endm
47
48#else /* X86_32 */
49
50.macro op_safe_regs op
51SYM_FUNC_START(\op\()_safe_regs)
52 pushl %ebx
53 pushl %ebp
54 pushl %esi
55 pushl %edi
56 pushl $0 /* Return value */
57 pushl %eax
58 movl 4(%eax), %ecx
59 movl 8(%eax), %edx
60 movl 12(%eax), %ebx
61 movl 20(%eax), %ebp
62 movl 24(%eax), %esi
63 movl 28(%eax), %edi
64 movl (%eax), %eax
651: \op
662: pushl %eax
67 movl 4(%esp), %eax
68 popl (%eax)
69 addl $4, %esp
70 movl %ecx, 4(%eax)
71 movl %edx, 8(%eax)
72 movl %ebx, 12(%eax)
73 movl %ebp, 20(%eax)
74 movl %esi, 24(%eax)
75 movl %edi, 28(%eax)
76 popl %eax
77 popl %edi
78 popl %esi
79 popl %ebp
80 popl %ebx
81 RET
823:
83 movl $-EIO, 4(%esp)
84 jmp 2b
85
86 _ASM_EXTABLE(1b, 3b)
87SYM_FUNC_END(\op\()_safe_regs)
88.endm
89
90#endif
91
92op_safe_regs rdmsr
93op_safe_regs wrmsr
94
95