/* | |
* 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 | |