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93 lines
1.7 KiB
93 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/linkage.h> |
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#include <linux/errno.h> |
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#include <asm/asm.h> |
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#include <asm/msr.h> |
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#ifdef CONFIG_X86_64 |
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/* |
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* int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]); |
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* |
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* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi] |
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* |
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*/ |
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.macro op_safe_regs op |
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SYM_FUNC_START(\op\()_safe_regs) |
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pushq %rbx |
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pushq %r12 |
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movq %rdi, %r10 /* Save pointer */ |
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xorl %r11d, %r11d /* Return value */ |
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movl (%rdi), %eax |
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movl 4(%rdi), %ecx |
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movl 8(%rdi), %edx |
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movl 12(%rdi), %ebx |
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movl 20(%rdi), %r12d |
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movl 24(%rdi), %esi |
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movl 28(%rdi), %edi |
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1: \op |
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2: movl %eax, (%r10) |
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movl %r11d, %eax /* Return value */ |
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movl %ecx, 4(%r10) |
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movl %edx, 8(%r10) |
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movl %ebx, 12(%r10) |
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movl %r12d, 20(%r10) |
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movl %esi, 24(%r10) |
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movl %edi, 28(%r10) |
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popq %r12 |
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popq %rbx |
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ret |
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3: |
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movl $-EIO, %r11d |
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jmp 2b |
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_ASM_EXTABLE(1b, 3b) |
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SYM_FUNC_END(\op\()_safe_regs) |
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.endm |
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#else /* X86_32 */ |
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.macro op_safe_regs op |
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SYM_FUNC_START(\op\()_safe_regs) |
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pushl %ebx |
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pushl %ebp |
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pushl %esi |
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pushl %edi |
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pushl $0 /* Return value */ |
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pushl %eax |
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movl 4(%eax), %ecx |
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movl 8(%eax), %edx |
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movl 12(%eax), %ebx |
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movl 20(%eax), %ebp |
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movl 24(%eax), %esi |
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movl 28(%eax), %edi |
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movl (%eax), %eax |
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1: \op |
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2: pushl %eax |
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movl 4(%esp), %eax |
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popl (%eax) |
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addl $4, %esp |
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movl %ecx, 4(%eax) |
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movl %edx, 8(%eax) |
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movl %ebx, 12(%eax) |
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movl %ebp, 20(%eax) |
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movl %esi, 24(%eax) |
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movl %edi, 28(%eax) |
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popl %eax |
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popl %edi |
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popl %esi |
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popl %ebp |
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popl %ebx |
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ret |
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3: |
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movl $-EIO, 4(%esp) |
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jmp 2b |
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_ASM_EXTABLE(1b, 3b) |
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SYM_FUNC_END(\op\()_safe_regs) |
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.endm |
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#endif |
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op_safe_regs rdmsr |
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op_safe_regs wrmsr |
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