/* | |
* linux/arch/arm/lib/io-writesw-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> | |
.macro outword, rd | |
#ifndef __ARMEB__ | |
strh \rd, [r0] | |
mov \rd, \rd, lsr #16 | |
strh \rd, [r0] | |
#else | |
mov lr, \rd, lsr #16 | |
strh lr, [r0] | |
strh \rd, [r0] | |
#endif | |
.endm | |
.Loutsw_align: movs ip, r1, lsl #31 | |
bne .Loutsw_noalign | |
ldrh r3, [r1], #2 | |
sub r2, r2, #1 | |
strh r3, [r0] | |
ENTRY(__raw_writesw) | |
teq r2, #0 | |
moveq pc, lr | |
ands r3, r1, #3 | |
bne .Loutsw_align | |
stmfd sp!, {r4, r5, lr} | |
subs r2, r2, #8 | |
bmi .Lno_outsw_8 | |
.Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} | |
subs r2, r2, #8 | |
outword r3 | |
outword r4 | |
outword r5 | |
outword ip | |
bpl .Loutsw_8_lp | |
.Lno_outsw_8: tst r2, #4 | |
beq .Lno_outsw_4 | |
ldmia r1!, {r3, ip} | |
outword r3 | |
outword ip | |
.Lno_outsw_4: movs r2, r2, lsl #31 | |
bcc .Lno_outsw_2 | |
ldr r3, [r1], #4 | |
outword r3 | |
.Lno_outsw_2: ldrneh r3, [r1] | |
strneh r3, [r0] | |
ldmfd sp!, {r4, r5, pc} | |
#ifdef __ARMEB__ | |
#define pull_hbyte0 lsl #8 | |
#define push_hbyte1 lsr #24 | |
#else | |
#define pull_hbyte0 lsr #24 | |
#define push_hbyte1 lsl #8 | |
#endif | |
.Loutsw_noalign: | |
ARM( ldr r3, [r1, -r3]! ) | |
THUMB( rsb r3, r3, #0 ) | |
THUMB( ldr r3, [r1, r3] ) | |
THUMB( sub r1, r3 ) | |
subcs r2, r2, #1 | |
bcs 2f | |
subs r2, r2, #2 | |
bmi 3f | |
1: mov ip, r3, lsr #8 | |
strh ip, [r0] | |
2: mov ip, r3, pull_hbyte0 | |
ldr r3, [r1, #4]! | |
subs r2, r2, #2 | |
orr ip, ip, r3, push_hbyte1 | |
strh ip, [r0] | |
bpl 1b | |
tst r2, #1 | |
3: movne ip, r3, lsr #8 | |
strneh ip, [r0] | |
mov pc, lr | |
ENDPROC(__raw_writesw) |