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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
| SYM_FUNC_START(\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)
| SYM_FUNC_END(\op\()_safe_regs)
| .endm
|
| #else /* X86_32 */
|
| .macro op_safe_regs op
| SYM_FUNC_START(\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)
| SYM_FUNC_END(\op\()_safe_regs)
| .endm
|
| #endif
|
| op_safe_regs rdmsr
| op_safe_regs wrmsr
|
|
