Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * __put_user functions.

 *

 * (C) Copyright 1998 Linus Torvalds

 * (C) Copyright 2005 Andi Kleen

 *

 * 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.

 */

/*

 * __put_user_X

 *

 * Inputs:      %rcx contains the address

 *              %rdx contains new value

 *

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

 *

 * %r8 is destroyed.

 *

 * These functions should not modify any other registers,

 * as they get called from within inline assembly.

 */

#include 

#include 

#include 

#include 

#include 

#include 

        .text

ENTRY(__put_user_1)

        CFI_STARTPROC

        GET_THREAD_INFO(%r8)

        cmpq threadinfo_addr_limit(%r8),%rcx

        jae bad_put_user

1:      movb %dl,(%rcx)

        xorl %eax,%eax

        ret

        CFI_ENDPROC

ENDPROC(__put_user_1)

ENTRY(__put_user_2)

        CFI_STARTPROC

        GET_THREAD_INFO(%r8)

        addq $1,%rcx

        jc 20f

        cmpq threadinfo_addr_limit(%r8),%rcx

        jae 20f

        decq %rcx

2:      movw %dx,(%rcx)

        xorl %eax,%eax

        ret

20:     decq %rcx

        jmp bad_put_user

        CFI_ENDPROC

ENDPROC(__put_user_2)

ENTRY(__put_user_4)

        CFI_STARTPROC

        GET_THREAD_INFO(%r8)

        addq $3,%rcx

        jc 30f

        cmpq threadinfo_addr_limit(%r8),%rcx

        jae 30f

        subq $3,%rcx

3:      movl %edx,(%rcx)

        xorl %eax,%eax

        ret

30:     subq $3,%rcx

        jmp bad_put_user

        CFI_ENDPROC

ENDPROC(__put_user_4)

ENTRY(__put_user_8)

        CFI_STARTPROC

        GET_THREAD_INFO(%r8)

        addq $7,%rcx

        jc 40f

        cmpq threadinfo_addr_limit(%r8),%rcx

        jae 40f

        subq $7,%rcx

4:      movq %rdx,(%rcx)

        xorl %eax,%eax

        ret

40:     subq $7,%rcx

        jmp bad_put_user

        CFI_ENDPROC

ENDPROC(__put_user_8)

bad_put_user:

        CFI_STARTPROC

        movq $(-EFAULT),%rax

        ret

        CFI_ENDPROC

END(bad_put_user)

.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