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/*

 * __put_user functions.

 *

 * (C) Copyright 1998 Linus Torvalds

 *

 * These functions have a non-standard call interface

 * to make them more efficient.

 */

/*

 * __put_user_X

 *

 * Inputs:      %rax contains the address

 *              %rdx contains the value

 *

 * Outputs:     %rax is error code (0 or -EFAULT)

 *              %rbx is corrupted (will contain "current_task").

 *

 * These functions should not modify any other registers,

 * as they get called from within inline assembly.

 */

/* FIXME: putuser.S should be really merged with getuser.S, and preprocessor should be used to keep code duplication lower */

#include 

#include 

#include 

#include 

#include 

.text

.p2align

.globl __put_user_1

__put_user_1:

        GET_CURRENT(%rbx)

        cmpq tsk_addr_limit(%rbx),%rax

        jae bad_put_user

1:      movb %dl,(%rax)

        xorq %rax,%rax

        ret

.p2align

.globl __put_user_2

__put_user_2:

        GET_CURRENT(%rbx)

        addq $1,%rax

        jc              bad_put_user

        cmpq    tsk_addr_limit(%rbx),%rax

        jae     bad_put_user

2:      movw %dx,-1(%rax)

        xorq %rax,%rax

        ret

.p2align

.globl __put_user_4

__put_user_4:

        GET_CURRENT(%rbx)

        addq $3,%rax

        jc              bad_put_user

        cmpq    tsk_addr_limit(%rbx),%rax

        jae     bad_put_user

3:      movl %edx,-3(%rax)

        xorq %rax,%rax

        ret

.p2align

.globl __put_user_8

__put_user_8:

        GET_CURRENT(%rbx)

        addq $7,%rax

        jc      bad_put_user

        cmpq    tsk_addr_limit(%rbx),%rax

        jae     bad_put_user

4:      movq %rdx,-7(%rax)

        xorq %rax,%rax

        ret

ENTRY(bad_put_user)

bad_put_user:

        movq $(-EFAULT),%rax

        ret

.section __ex_table,"a"

        .quad 1b,bad_put_user

        .quad 2b,bad_put_user

        .quad 3b,bad_put_user

        .quad 4b,bad_put_user

.previous