Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 *  linux/arch/arm/lib/putuser.S
 *
 *  Copyright (C) 2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Idea from x86 version, (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.
 *
 * __put_user_X
 *
 * Inputs:      r0 contains the address
 *              r2, r3 contains the value
 * Outputs:     r0 is the error code
 *              lr corrupted
 *
 * No other registers must be altered.  (see include/asm-arm/uaccess.h
 * for specific ASM register usage).
 *
 * Note that ADDR_LIMIT is either 0 or 0xc0000000
 * Note also that it is intended that __put_user_bad is not global.
 */
#include <asm/errno.h>

        .global __put_user_1
__put_user_1:
1:      strbt   r2, [r0]
        mov     r0, #0
        mov     pc, lr

        .global __put_user_2
__put_user_2:
        mov     ip, r2, lsr #8
#ifndef __ARMEB__
2:      strbt   r2, [r0], #1
3:      strbt   ip, [r0]
#else
2:      strbt   ip, [r0], #1
3:      strbt   r2, [r0]
#endif
        mov     r0, #0
        mov     pc, lr

        .global __put_user_4
__put_user_4:
4:      strt    r2, [r0]
        mov     r0, #0
        mov     pc, lr

        .global __put_user_8
__put_user_8:
5:      strt    r2, [r0], #4
6:      strt    r3, [r0]
        mov     r0, #0
        mov     pc, lr

__put_user_bad:
        mov     r0, #-EFAULT
        mov     pc, lr

.section __ex_table, "a"
        .long   1b, __put_user_bad
        .long   2b, __put_user_bad
        .long   3b, __put_user_bad
        .long   4b, __put_user_bad
        .long   5b, __put_user_bad
        .long   6b, __put_user_bad
.previous