| Borislav Petkov | 132ec92 | 2009-08-31 09:50:09 +0200 | [diff] [blame^] | 1 | #include <linux/linkage.h> |
| 2 | #include <linux/errno.h> |
| 3 | #include <asm/asm.h> |
| 4 | #include <asm/msr.h> |
| 5 | |
| 6 | #ifdef CONFIG_X86_64 |
| 7 | /* |
| 8 | * int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]); |
| 9 | * |
| 10 | * reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi] |
| 11 | * |
| 12 | */ |
| 13 | .macro op_safe_regs op:req |
| 14 | ENTRY(native_\op\()_safe_regs) |
| 15 | push %rbx |
| 16 | push %rbp |
| 17 | push $0 /* Return value */ |
| 18 | push %rdi |
| 19 | movl (%rdi), %eax |
| 20 | movl 4(%rdi), %ecx |
| 21 | movl 8(%rdi), %edx |
| 22 | movl 12(%rdi), %ebx |
| 23 | movl 20(%rdi), %ebp |
| 24 | movl 24(%rdi), %esi |
| 25 | movl 28(%rdi), %edi |
| 26 | 1: \op |
| 27 | 2: movl %edi, %r10d |
| 28 | pop %rdi |
| 29 | movl %eax, (%rdi) |
| 30 | movl %ecx, 4(%rdi) |
| 31 | movl %edx, 8(%rdi) |
| 32 | movl %ebx, 12(%rdi) |
| 33 | movl %ebp, 20(%rdi) |
| 34 | movl %esi, 24(%rdi) |
| 35 | movl %r10d, 28(%rdi) |
| 36 | pop %rax |
| 37 | pop %rbp |
| 38 | pop %rbx |
| 39 | ret |
| 40 | 3: |
| 41 | movq $-EIO, 8(%rsp) |
| 42 | jmp 2b |
| 43 | .section __ex_table,"ax" |
| 44 | .balign 4 |
| 45 | .quad 1b, 3b |
| 46 | .previous |
| 47 | ENDPROC(native_\op\()_safe_regs) |
| 48 | .endm |
| 49 | |
| 50 | #else /* X86_32 */ |
| 51 | |
| 52 | .macro op_safe_regs op:req |
| 53 | ENTRY(native_\op\()_safe_regs) |
| 54 | push %ebx |
| 55 | push %ebp |
| 56 | push %esi |
| 57 | push %edi |
| 58 | push $0 /* Return value */ |
| 59 | push %eax |
| 60 | movl 4(%eax), %ecx |
| 61 | movl 8(%eax), %edx |
| 62 | movl 12(%eax), %ebx |
| 63 | movl 20(%eax), %ebp |
| 64 | movl 24(%eax), %esi |
| 65 | movl 28(%eax), %edi |
| 66 | movl (%eax), %eax |
| 67 | 1: \op |
| 68 | 2: push %eax |
| 69 | movl 4(%esp), %eax |
| 70 | pop (%eax) |
| 71 | addl $4, %esp |
| 72 | movl %ecx, 4(%eax) |
| 73 | movl %edx, 8(%eax) |
| 74 | movl %ebx, 12(%eax) |
| 75 | movl %ebp, 20(%eax) |
| 76 | movl %esi, 24(%eax) |
| 77 | movl %edi, 28(%eax) |
| 78 | pop %eax |
| 79 | pop %edi |
| 80 | pop %esi |
| 81 | pop %ebp |
| 82 | pop %ebx |
| 83 | ret |
| 84 | 3: |
| 85 | movl $-EIO, 4(%esp) |
| 86 | jmp 2b |
| 87 | .section __ex_table,"ax" |
| 88 | .balign 4 |
| 89 | .long 1b, 3b |
| 90 | .previous |
| 91 | ENDPROC(native_\op\()_safe_regs) |
| 92 | .endm |
| 93 | |
| 94 | #endif |
| 95 | |
| 96 | op_safe_regs rdmsr |
| 97 | op_safe_regs wrmsr |
| 98 | |