[linux-2.6-block.git] / arch / x86 / lib / msr-reg.S

#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 %rbp
	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), %ebp
	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    %ebp, 20(%r10)
	movl    %esi, 24(%r10)
	movl    %edi, 28(%r10)
	popq %rbp
	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
Commit	Line	Data
132ec92f BP	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	/*
1f975f78	8	* int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
132ec92f BP	9	*
	10	* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
	11	*
	12	*/
f6909f39	13	.macro op_safe_regs op
1f975f78	14	ENTRY(\op\()_safe_regs)
131484c8 IM	15	pushq %rbx
131484c8 IM	16	pushq %rbp
79c5dca3 PA	17	movq %rdi, %r10 /* Save pointer */
79c5dca3 PA	18	xorl %r11d, %r11d /* Return value */
132ec92f BP	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
79c5dca3 PA	27	2: movl %eax, (%r10)
	28	movl %r11d, %eax /* Return value */
	29	movl %ecx, 4(%r10)
	30	movl %edx, 8(%r10)
	31	movl %ebx, 12(%r10)
	32	movl %ebp, 20(%r10)
	33	movl %esi, 24(%r10)
	34	movl %edi, 28(%r10)
131484c8 IM	35	popq %rbp
131484c8 IM	36	popq %rbx
132ec92f BP	37	ret
132ec92f BP	38	3:
79c5dca3	39	movl $-EIO, %r11d
132ec92f	40	jmp 2b
79c5dca3 PA	41
79c5dca3 PA	42	_ASM_EXTABLE(1b, 3b)
1f975f78	43	ENDPROC(\op\()_safe_regs)
132ec92f BP	44	.endm
	45
	46	#else /* X86_32 */
	47
8adf65cf	48	.macro op_safe_regs op
1f975f78	49	ENTRY(\op\()_safe_regs)
131484c8 IM	50	pushl %ebx
	51	pushl %ebp
	52	pushl %esi
	53	pushl %edi
	54	pushl $0 /* Return value */
	55	pushl %eax
132ec92f BP	56	movl 4(%eax), %ecx
	57	movl 8(%eax), %edx
	58	movl 12(%eax), %ebx
	59	movl 20(%eax), %ebp
	60	movl 24(%eax), %esi
	61	movl 28(%eax), %edi
	62	movl (%eax), %eax
	63	1: \op
131484c8	64	2: pushl %eax
132ec92f	65	movl 4(%esp), %eax
131484c8	66	popl (%eax)
132ec92f BP	67	addl $4, %esp
	68	movl %ecx, 4(%eax)
	69	movl %edx, 8(%eax)
	70	movl %ebx, 12(%eax)
	71	movl %ebp, 20(%eax)
	72	movl %esi, 24(%eax)
	73	movl %edi, 28(%eax)
131484c8 IM	74	popl %eax
	75	popl %edi
	76	popl %esi
	77	popl %ebp
	78	popl %ebx
132ec92f BP	79	ret
	80	3:
	81	movl $-EIO, 4(%esp)
	82	jmp 2b
79c5dca3 PA	83
79c5dca3 PA	84	_ASM_EXTABLE(1b, 3b)
1f975f78	85	ENDPROC(\op\()_safe_regs)
132ec92f BP	86	.endm
	87
	88	#endif
	89
	90	op_safe_regs rdmsr
	91	op_safe_regs wrmsr
	92