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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/linkage.h>
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/msr.h>
#ifdef CONFIG_X86_64
/*
* int {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(\op\()_safe_regs)
pushq %rbx
pushq %r12
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), %r12d
movl 24(%rdi), %esi
movl 28(%rdi), %edi
1: \op
2: movl %eax, (%r10)
movl %r11d, %eax /* Return value */
movl %ecx, 4(%r10)
movl %edx, 8(%r10)
movl %ebx, 12(%r10)
movl %r12d, 20(%r10)
movl %esi, 24(%r10)
movl %edi, 28(%r10)
popq %r12
popq %rbx
ret
3:
movl $-EIO, %r11d
jmp 2b
_ASM_EXTABLE(1b, 3b)
ENDPROC(\op\()_safe_regs)
.endm
#else /* X86_32 */
.macro op_safe_regs op
ENTRY(\op\()_safe_regs)
pushl %ebx
pushl %ebp
pushl %esi
pushl %edi
pushl $0 /* Return value */
pushl %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
1: \op
2: pushl %eax
movl 4(%esp), %eax
popl (%eax)
addl $4, %esp
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 %eax
popl %edi
popl %esi
popl %ebp
popl %ebx
ret
3:
movl $-EIO, 4(%esp)
jmp 2b
_ASM_EXTABLE(1b, 3b)
ENDPROC(\op\()_safe_regs)
.endm
#endif
op_safe_regs rdmsr
op_safe_regs wrmsr
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