mini/utils_asm.S at master · theStack/mini · GitHub

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/*
	mini - a Free Software replacement for the Nintendo/BroadOn IOS.
	random utilities

Copyright (C) 2008, 2009	Hector Martin "marcan" <marcan@marcansoft.com>

# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/

.arm

.globl memcpy32
.globl memcpy16
.globl memcpy8
.globl memset32
.globl memset16
.globl memset8

.text

memcpy32:
	bics	r2, #3
	bxeq	lr
1:	ldr		r3, [r1],#4
	str		r3, [r0],#4
	subs	r2, #4
	bne		1b
	bx		lr

memset32:
	bics	r2, #3
	bxeq	lr
1:	str		r1, [r0],#4
	subs	r2, #4
	bne		1b
	bx		lr

memcpy16:
	bics	r2, #1
	bxeq	lr
1:	ldrh	r3, [r1],#2
	strh	r3, [r0],#2
	subs	r2, #2
	bne		1b
	bx		lr

memset16:
	bics	r2, #1
	bxeq	lr
1:	strh	r1, [r0],#2
	subs	r2, #2
	bne		1b
	bx		lr

memcpy8:
	cmp		r2, #0
	bxeq	lr
1:	ldrb	r3, [r1],#1
	strb	r3, [r0],#1
	subs	r2, #1
	bne		1b
	bx		lr

memset8:
	cmp		r2, #0
	bxeq	lr
1:	strb	r1, [r0],#1
	subs	r2, #1
	bne		1b
	bx		lr