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 15 SYM_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 27 1: \op 28 2: 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 39 3: 40 movl $-EIO, %r11d 41 jmp 2b 42 43 _ASM_EXTABLE(1b, 3b) 44 SYM_FUNC_END(\op\()_safe_regs) 45 .endm 46 47 #else /* X86_32 */ 48 49 .macro op_safe_regs op 50 SYM_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 64 1: \op 65 2: 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 81 3: 82 movl $-EIO, 4(%esp) 83 jmp 2b 84 85 _ASM_EXTABLE(1b, 3b) 86 SYM_FUNC_END(\op\()_safe_regs) 87 .endm 88 89 #endif 90 91 op_safe_regs rdmsr 92 op_safe_regs wrmsr 93 94