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/*
 *  linux/arch/arm/lib/io-readsl-armv4.S
 *
 *  Copyright (C) 1995-2000 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.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/hardware.h>

/*
 * Note that some reads can be aligned on half-word boundaries.
 */
ENTRY(__raw_readsl)
                teq     r2, #0          @ do we have to check for the zero len?
                moveq   pc, lr
                ands    ip, r1, #3
                bne     2f

1:              ldr     r3, [r0]
                str     r3, [r1], #4
                subs    r2, r2, #1
                bne     1b
                mov     pc, lr

2:              cmp     ip, #2
                ldr     ip, [r0]
                blt     4f
                bgt     6f

                strh    ip, [r1], #2
                mov     ip, ip, lsr #16
3:              subs    r2, r2, #1
                ldrne   r3, [r0]
                orrne   ip, ip, r3, lsl #16
                strne   ip, [r1], #4
                movne   ip, r3, lsr #16
                bne     3b
                strh    ip, [r1], #2
                mov     pc, lr

4:              strb    ip, [r1], #1
                mov     ip, ip, lsr #8
                strh    ip, [r1], #2
                mov     ip, ip, lsr #16
5:              subs    r2, r2, #1
                ldrne   r3, [r0]
                orrne   ip, ip, r3, lsl #8
                strne   ip, [r1], #4
                movne   ip, r3, lsr #24
                bne     5b
                strb    ip, [r1], #1
                mov     pc, lr

6:              strb    ip, [r1], #1
                mov     ip, ip, lsr #8
7:              subs    r2, r2, #1
                ldrne   r3, [r0]
                orrne   ip, ip, r3, lsl #24
                strne   ip, [r1], #4
                movne   ip, r3, lsr #8
                bne     7b
                strh    ip, [r1], #2
                mov     ip, ip, lsr #16
                strb    ip, [r1]
                mov     pc, lr