?? getuser.s
字號:
/* * __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
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