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

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#include <linux/linkage.h>
 3#include <linux/errno.h>
 
 4#include <asm/asm.h>
 5#include <asm/msr.h>
 6
 7#ifdef CONFIG_X86_64
 8/*
 9 * int {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
15SYM_FUNC_START(\op\()_safe_regs)
16	pushq %rbx
17	pushq %r12
 
18	movq	%rdi, %r10	/* Save pointer */
19	xorl	%r11d, %r11d	/* Return value */
20	movl    (%rdi), %eax
21	movl    4(%rdi), %ecx
22	movl    8(%rdi), %edx
23	movl    12(%rdi), %ebx
24	movl    20(%rdi), %r12d
25	movl    24(%rdi), %esi
26	movl    28(%rdi), %edi
 
271:	\op
282:	movl    %eax, (%r10)
29	movl	%r11d, %eax	/* Return value */
30	movl    %ecx, 4(%r10)
31	movl    %edx, 8(%r10)
32	movl    %ebx, 12(%r10)
33	movl    %r12d, 20(%r10)
34	movl    %esi, 24(%r10)
35	movl    %edi, 28(%r10)
36	popq %r12
37	popq %rbx
38	RET
393:
 
40	movl    $-EIO, %r11d
41	jmp     2b
42
43	_ASM_EXTABLE(1b, 3b)
44SYM_FUNC_END(\op\()_safe_regs)
 
45.endm
46
47#else /* X86_32 */
48
49.macro op_safe_regs op
50SYM_FUNC_START(\op\()_safe_regs)
51	pushl %ebx
52	pushl %ebp
53	pushl %esi
54	pushl %edi
55	pushl $0              /* Return value */
56	pushl %eax
 
57	movl    4(%eax), %ecx
58	movl    8(%eax), %edx
59	movl    12(%eax), %ebx
60	movl    20(%eax), %ebp
61	movl    24(%eax), %esi
62	movl    28(%eax), %edi
63	movl    (%eax), %eax
 
641:	\op
652:	pushl %eax
66	movl    4(%esp), %eax
67	popl (%eax)
68	addl    $4, %esp
 
69	movl    %ecx, 4(%eax)
70	movl    %edx, 8(%eax)
71	movl    %ebx, 12(%eax)
72	movl    %ebp, 20(%eax)
73	movl    %esi, 24(%eax)
74	movl    %edi, 28(%eax)
75	popl %eax
76	popl %edi
77	popl %esi
78	popl %ebp
79	popl %ebx
80	RET
813:
 
82	movl    $-EIO, 4(%esp)
83	jmp     2b
84
85	_ASM_EXTABLE(1b, 3b)
86SYM_FUNC_END(\op\()_safe_regs)
 
87.endm
88
89#endif
90
91op_safe_regs rdmsr
92op_safe_regs wrmsr
93