Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * __put_user functions.

 *

 * (C) Copyright 2005 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.

 */

#include 

#include 

#include 

/*

 * __put_user_X

 *

 * Inputs:      %eax[:%edx] contains the data

 *              %ecx contains the address

 *

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

 *

 * These functions should not modify any other registers,

 * as they get called from within inline assembly.

 */

#define ENTER   CFI_STARTPROC ; \

                pushl %ebx ; \

                CFI_ADJUST_CFA_OFFSET 4 ; \

                CFI_REL_OFFSET ebx, 0 ; \

                GET_THREAD_INFO(%ebx)

#define EXIT    popl %ebx ; \

                CFI_ADJUST_CFA_OFFSET -4 ; \

                CFI_RESTORE ebx ; \

                ret ; \

                CFI_ENDPROC

.text

ENTRY(__put_user_1)

        ENTER

        cmpl TI_addr_limit(%ebx),%ecx

        jae bad_put_user

1:      movb %al,(%ecx)

        xorl %eax,%eax

        EXIT

ENDPROC(__put_user_1)

ENTRY(__put_user_2)

        ENTER

        movl TI_addr_limit(%ebx),%ebx

        subl $1,%ebx

        cmpl %ebx,%ecx

        jae bad_put_user

2:      movw %ax,(%ecx)

        xorl %eax,%eax

        EXIT

ENDPROC(__put_user_2)

ENTRY(__put_user_4)

        ENTER

        movl TI_addr_limit(%ebx),%ebx

        subl $3,%ebx

        cmpl %ebx,%ecx

        jae bad_put_user

3:      movl %eax,(%ecx)

        xorl %eax,%eax

        EXIT

ENDPROC(__put_user_4)

ENTRY(__put_user_8)

        ENTER

        movl TI_addr_limit(%ebx),%ebx

        subl $7,%ebx

        cmpl %ebx,%ecx

        jae bad_put_user

4:      movl %eax,(%ecx)

5:      movl %edx,4(%ecx)

        xorl %eax,%eax

        EXIT

ENDPROC(__put_user_8)

bad_put_user:

        CFI_STARTPROC simple

        CFI_DEF_CFA esp, 2*4

        CFI_OFFSET eip, -1*4

        CFI_OFFSET ebx, -2*4

        movl $-14,%eax

        EXIT

END(bad_put_user)

.section __ex_table,"a"

        .long 1b,bad_put_user

        .long 2b,bad_put_user

        .long 3b,bad_put_user

        .long 4b,bad_put_user

        .long 5b,bad_put_user

.previous