/* | |
* linux/arch/arm/lib/io-writesb.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__ | |
strb \rd, [r0] | |
mov \rd, \rd, lsr #8 | |
strb \rd, [r0] | |
mov \rd, \rd, lsr #8 | |
strb \rd, [r0] | |
mov \rd, \rd, lsr #8 | |
strb \rd, [r0] | |
#else | |
mov lr, \rd, lsr #24 | |
strb lr, [r0] | |
mov lr, \rd, lsr #16 | |
strb lr, [r0] | |
mov lr, \rd, lsr #8 | |
strb lr, [r0] | |
strb \rd, [r0] | |
#endif | |
.endm | |
.Loutsb_align: rsb ip, ip, #4 | |
cmp ip, r2 | |
movgt ip, r2 | |
cmp ip, #2 | |
ldrb r3, [r1], #1 | |
strb r3, [r0] | |
ldrgeb r3, [r1], #1 | |
strgeb r3, [r0] | |
ldrgtb r3, [r1], #1 | |
strgtb r3, [r0] | |
subs r2, r2, ip | |
bne .Loutsb_aligned | |
ENTRY(__raw_writesb) | |
teq r2, #0 @ do we have to check for the zero len? | |
moveq pc, lr | |
ands ip, r1, #3 | |
bne .Loutsb_align | |
.Loutsb_aligned: | |
stmfd sp!, {r4, r5, lr} | |
subs r2, r2, #16 | |
bmi .Loutsb_no_16 | |
.Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip} | |
outword r3 | |
outword r4 | |
outword r5 | |
outword ip | |
subs r2, r2, #16 | |
bpl .Loutsb_16_lp | |
tst r2, #15 | |
ldmeqfd sp!, {r4, r5, pc} | |
.Loutsb_no_16: tst r2, #8 | |
beq .Loutsb_no_8 | |
ldmia r1!, {r3, r4} | |
outword r3 | |
outword r4 | |
.Loutsb_no_8: tst r2, #4 | |
beq .Loutsb_no_4 | |
ldr r3, [r1], #4 | |
outword r3 | |
.Loutsb_no_4: ands r2, r2, #3 | |
ldmeqfd sp!, {r4, r5, pc} | |
cmp r2, #2 | |
ldrb r3, [r1], #1 | |
strb r3, [r0] | |
ldrgeb r3, [r1], #1 | |
strgeb r3, [r0] | |
ldrgtb r3, [r1] | |
strgtb r3, [r0] | |
ldmfd sp!, {r4, r5, pc} | |
ENDPROC(__raw_writesb) |