79 строки
1.5 KiB
ArmAsm
79 строки
1.5 KiB
ArmAsm
/*
|
|
* linux/arch/arm26/lib/io-readsl.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
|
|
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
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
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov pc, lr
|
|
|
|
4: strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
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
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov ip, ip, lsr #8
|
|
strb ip, [r1], #1
|
|
mov pc, lr
|
|
|