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/*
* linux/arch/arm/lib/memzero.S
*
* Copyright (C) 1995-1999 Russell King
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include "constants.h"
.text
/*
* Prototype: void memzero(void *d, size_t n)
*/
1: @ 4 <= r1
cmp ip, #2 @ 1
strltb r2, [r0], #1 @ 1
strleb r2, [r0], #1 @ 1
strb r2, [r0], #1 @ 1
rsb ip, ip, #4 @ 1
sub r1, r1, ip @ 1
cmp r1, #3 @ 1
bgt 2f @ 1 @ +8
b 4f @ 1 @ +9
.align 5
ENTRY(__memzero)
mov r2, #0 @ 1
cmp r1, #4 @ 1
blt 4f @ 1 @ = 3
@ r1 >= 4
ands ip, r0, #3 @ 1
bne 1b @ 1 @ = 5
2: @ r1 >= 4 && (r0 & 3) = 0 @ = 5 or 11
str lr, [sp, #-4]! @ 1
mov r3, #0 @ 1
mov ip, #0 @ 1
mov lr, #0 @ 1
@ 4 <= r1 <= 32 @ = 9 or 15
3: subs r1, r1, #32 @ 1
stmgeia r0!, {r2, r3, ip, lr} @ 4
stmgeia r0!, {r2, r3, ip, lr} @ 4
bgt 3b @ 1
LOADREGS(eqfd, sp!, {pc}) @ 1/2
@ -28 <= r1 <= -1
cmp r1, #-16 @ 1
stmgeia r0!, {r2, r3, ip, lr} @ 4
ldr lr, [sp], #4 @ 1
addlts r1, r1, #16 @ 1
RETINSTR(moveq,pc,lr) @ 1
@ -12 <= r1 <= -1
cmp r1, #-8 @ 1
stmgeia r0!, {r2, r3} @ 2
addlts r1, r1, #8 @ 1
RETINSTR(moveq,pc,lr) @ 1
@ -4 <= r1 <= -1
cmp r1, #-4 @ 1
strge r2, [r0], #4 @ 1
adds r1, r1, #4 @ 1
RETINSTR(moveq,pc,lr) @ 1
4: @ 1 <= r1 <= 3
cmp r1, #2 @ 1
strgtb r2, [r0], #1 @ 1
strgeb r2, [r0], #1 @ 1
strb r2, [r0], #1 @ 1
RETINSTR(mov,pc,lr) @ 1
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