Blame - arch/x86/lib/msr-reg.S - kernel/msm

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Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	1	#include <linux/linkage.h>
				2	#include <linux/errno.h>
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	3	#include <asm/dwarf2.h>
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	4	#include <asm/asm.h>
				5	#include <asm/msr.h>
				6
				7	#ifdef CONFIG_X86_64
				8	/*
				9	* int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
				10	*
				11	* reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
				12	*
				13	*/
H. Peter Anvin	f6909f3	2009-09-01 13:31:52 -0700	[diff] [blame]	14	.macro op_safe_regs op
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	15	ENTRY(native_\op\()_safe_regs)
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	16	CFI_STARTPROC
				17	pushq_cfi %rbx
				18	pushq_cfi %rbp
				19	movq %rdi, %r10 /* Save pointer */
				20	xorl %r11d, %r11d /* Return value */
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	21	movl (%rdi), %eax
				22	movl 4(%rdi), %ecx
				23	movl 8(%rdi), %edx
				24	movl 12(%rdi), %ebx
				25	movl 20(%rdi), %ebp
				26	movl 24(%rdi), %esi
				27	movl 28(%rdi), %edi
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	28	CFI_REMEMBER_STATE
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	29	1: \op
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	30	2: movl %eax, (%r10)
				31	movl %r11d, %eax /* Return value */
				32	movl %ecx, 4(%r10)
				33	movl %edx, 8(%r10)
				34	movl %ebx, 12(%r10)
				35	movl %ebp, 20(%r10)
				36	movl %esi, 24(%r10)
				37	movl %edi, 28(%r10)
				38	popq_cfi %rbp
				39	popq_cfi %rbx
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	40	ret
				41	3:
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	42	CFI_RESTORE_STATE
				43	movl $-EIO, %r11d
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	44	jmp 2b
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	45
				46	_ASM_EXTABLE(1b, 3b)
				47	CFI_ENDPROC
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	48	ENDPROC(native_\op\()_safe_regs)
				49	.endm
				50
				51	#else /* X86_32 */
				52
Ingo Molnar	8adf65c	2009-09-03 21:26:34 +0200	[diff] [blame^]	53	.macro op_safe_regs op
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	54	ENTRY(native_\op\()_safe_regs)
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	55	CFI_STARTPROC
				56	pushl_cfi %ebx
				57	pushl_cfi %ebp
				58	pushl_cfi %esi
				59	pushl_cfi %edi
				60	pushl_cfi $0 /* Return value */
				61	pushl_cfi %eax
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	62	movl 4(%eax), %ecx
				63	movl 8(%eax), %edx
				64	movl 12(%eax), %ebx
				65	movl 20(%eax), %ebp
				66	movl 24(%eax), %esi
				67	movl 28(%eax), %edi
				68	movl (%eax), %eax
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	69	CFI_REMEMBER_STATE
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	70	1: \op
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	71	2: pushl_cfi %eax
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	72	movl 4(%esp), %eax
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	73	popl_cfi (%eax)
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	74	addl $4, %esp
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	75	CFI_ADJUST_CFA_OFFSET -4
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	76	movl %ecx, 4(%eax)
				77	movl %edx, 8(%eax)
				78	movl %ebx, 12(%eax)
				79	movl %ebp, 20(%eax)
				80	movl %esi, 24(%eax)
				81	movl %edi, 28(%eax)
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	82	popl_cfi %eax
				83	popl_cfi %edi
				84	popl_cfi %esi
				85	popl_cfi %ebp
				86	popl_cfi %ebx
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	87	ret
				88	3:
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	89	CFI_RESTORE_STATE
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	90	movl $-EIO, 4(%esp)
				91	jmp 2b
H. Peter Anvin	79c5dca	2009-08-31 13:59:53 -0700	[diff] [blame]	92
				93	_ASM_EXTABLE(1b, 3b)
				94	CFI_ENDPROC
Borislav Petkov	132ec92	2009-08-31 09:50:09 +0200	[diff] [blame]	95	ENDPROC(native_\op\()_safe_regs)
				96	.endm
				97
				98	#endif
				99
				100	op_safe_regs rdmsr
				101	op_safe_regs wrmsr
				102