/* | |
* linux/arch/arm26/lib/io-readsb.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> | |
.insb_align: rsb ip, ip, #4 | |
cmp ip, r2 | |
movgt ip, r2 | |
cmp ip, #2 | |
ldrb r3, [r0] | |
strb r3, [r1], #1 | |
ldrgeb r3, [r0] | |
strgeb r3, [r1], #1 | |
ldrgtb r3, [r0] | |
strgtb r3, [r1], #1 | |
subs r2, r2, ip | |
bne .insb_aligned | |
ENTRY(__raw_readsb) | |
teq r2, #0 @ do we have to check for the zero len? | |
moveq pc, lr | |
ands ip, r1, #3 | |
bne .insb_align | |
.insb_aligned: stmfd sp!, {r4 - r6, lr} | |
subs r2, r2, #16 | |
bmi .insb_no_16 | |
.insb_16_lp: ldrb r3, [r0] | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #8 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #24 | |
ldrb r4, [r0] | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #8 | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #16 | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #24 | |
ldrb r5, [r0] | |
ldrb r6, [r0] | |
orr r5, r5, r6, lsl #8 | |
ldrb r6, [r0] | |
orr r5, r5, r6, lsl #16 | |
ldrb r6, [r0] | |
orr r5, r5, r6, lsl #24 | |
ldrb r6, [r0] | |
ldrb ip, [r0] | |
orr r6, r6, ip, lsl #8 | |
ldrb ip, [r0] | |
orr r6, r6, ip, lsl #16 | |
ldrb ip, [r0] | |
orr r6, r6, ip, lsl #24 | |
stmia r1!, {r3 - r6} | |
subs r2, r2, #16 | |
bpl .insb_16_lp | |
tst r2, #15 | |
LOADREGS(eqfd, sp!, {r4 - r6, pc}) | |
.insb_no_16: tst r2, #8 | |
beq .insb_no_8 | |
ldrb r3, [r0] | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #8 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #24 | |
ldrb r4, [r0] | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #8 | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #16 | |
ldrb r5, [r0] | |
orr r4, r4, r5, lsl #24 | |
stmia r1!, {r3, r4} | |
.insb_no_8: tst r2, #4 | |
beq .insb_no_4 | |
ldrb r3, [r0] | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #8 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #16 | |
ldrb r4, [r0] | |
orr r3, r3, r4, lsl #24 | |
str r3, [r1], #4 | |
.insb_no_4: ands r2, r2, #3 | |
LOADREGS(eqfd, sp!, {r4 - r6, pc}) | |
cmp r2, #2 | |
ldrb r3, [r0] | |
strb r3, [r1], #1 | |
ldrgeb r3, [r0] | |
strgeb r3, [r1], #1 | |
ldrgtb r3, [r0] | |
strgtb r3, [r1] | |
LOADREGS(fd, sp!, {r4 - r6, pc}) |