/* | |
* linux/arch/arm/lib/io-readsw-armv3.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 <mach/hardware.h> | |
.Linsw_bad_alignment: | |
adr r0, .Linsw_bad_align_msg | |
mov r2, lr | |
b panic | |
.Linsw_bad_align_msg: | |
.asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n" | |
.align | |
.Linsw_align: tst r1, #1 | |
bne .Linsw_bad_alignment | |
ldr r3, [r0] | |
strb r3, [r1], #1 | |
mov r3, r3, lsr #8 | |
strb r3, [r1], #1 | |
subs r2, r2, #1 | |
moveq pc, lr | |
ENTRY(__raw_readsw) | |
teq r2, #0 @ do we have to check for the zero len? | |
moveq pc, lr | |
tst r1, #3 | |
bne .Linsw_align | |
.Linsw_aligned: mov ip, #0xff | |
orr ip, ip, ip, lsl #8 | |
stmfd sp!, {r4, r5, r6, lr} | |
subs r2, r2, #8 | |
bmi .Lno_insw_8 | |
.Linsw_8_lp: ldr r3, [r0] | |
and r3, r3, ip | |
ldr r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
ldr r4, [r0] | |
and r4, r4, ip | |
ldr r5, [r0] | |
orr r4, r4, r5, lsl #16 | |
ldr r5, [r0] | |
and r5, r5, ip | |
ldr r6, [r0] | |
orr r5, r5, r6, lsl #16 | |
ldr r6, [r0] | |
and r6, r6, ip | |
ldr lr, [r0] | |
orr r6, r6, lr, lsl #16 | |
stmia r1!, {r3 - r6} | |
subs r2, r2, #8 | |
bpl .Linsw_8_lp | |
tst r2, #7 | |
ldmeqfd sp!, {r4, r5, r6, pc} | |
.Lno_insw_8: tst r2, #4 | |
beq .Lno_insw_4 | |
ldr r3, [r0] | |
and r3, r3, ip | |
ldr r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
ldr r4, [r0] | |
and r4, r4, ip | |
ldr r5, [r0] | |
orr r4, r4, r5, lsl #16 | |
stmia r1!, {r3, r4} | |
.Lno_insw_4: tst r2, #2 | |
beq .Lno_insw_2 | |
ldr r3, [r0] | |
and r3, r3, ip | |
ldr r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
str r3, [r1], #4 | |
.Lno_insw_2: tst r2, #1 | |
ldrne r3, [r0] | |
strneb r3, [r1], #1 | |
movne r3, r3, lsr #8 | |
strneb r3, [r1] | |
ldmfd sp!, {r4, r5, r6, pc} | |