100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
/*
|
|
* 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
|
|
reteq 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]
|
|
ret lr
|
|
ENDPROC(__raw_writesw)
|