/* * __get_user functions. * * (C) Copyright 1998 Linus Torvalds * * These functions have a non-standard call interface * to make them more efficient, especially as they * return an error value in addition to the "real" * return value. *//* * __get_user_X * * Inputs:	%rax contains the address * * Outputs:	%rax is error code (0 or -EFAULT) *		%rdx contains zero-extended value *  * %rbx is destroyed. * * These functions should not modify any other registers, * as they get called from within inline assembly. */#include <linux/linkage.h>#include <asm/page.h>#include <asm/errno.h>#include <asm/offset.h>#include <asm/thread_info.h>	.text	.p2align 4.globl __get_user_1__get_user_1:		GET_THREAD_INFO(%rbx)	cmpq threadinfo_addr_limit(%rbx),%rax	jae bad_get_user1:	movzb (%rax),%edx	xorq %rax,%rax	ret	.p2align 4.globl __get_user_2__get_user_2:	GET_THREAD_INFO(%rbx) 	addq $1,%rax	jc bad_get_user	cmpq threadinfo_addr_limit(%rbx),%rax 	jae	 bad_get_user2:	movzwl -1(%rax),%edx	xorq %rax,%rax	ret	.p2align 4.globl __get_user_4__get_user_4:	GET_THREAD_INFO(%rbx) 	addq $3,%rax	jc bad_get_user	cmpq threadinfo_addr_limit(%rbx),%rax 	jae bad_get_user3:	movl -3(%rax),%edx	xorq %rax,%rax	ret	.p2align 4.globl __get_user_8__get_user_8:	GET_THREAD_INFO(%rbx) 	addq $7,%rax	jc bad_get_user	cmpq threadinfo_addr_limit(%rbx),%rax	jae	bad_get_user4:	movq -7(%rax),%rdx	xorq %rax,%rax	retENTRY(bad_get_user)bad_get_user:	xorq %rdx,%rdx	movq $(-EFAULT),%rax	ret.section __ex_table,"a"	.quad 1b,bad_get_user	.quad 2b,bad_get_user	.quad 3b,bad_get_user	.quad 4b,bad_get_user.previous