xref: /aosp_15_r20/external/coreboot/src/arch/arm64/memcpy.S (revision b9411a12aaaa7e1e6a6fb7c5e057f44ee179a49c) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2
3#include <arch/asm.h>
4
5/*
6 * Copy a buffer from src to dest (alignment handled by the hardware)
7 *
8 * Parameters:
9 *	x0 - dest
10 *	x1 - src
11 *	x2 - n
12 * Returns:
13 *	x0 - dest
14 */
15ENTRY(memcpy)
16	mov	x4, x0
17	subs	x2, x2, #8
18	b.mi	2f
191:	ldr	x3, [x1], #8
20	subs	x2, x2, #8
21	str	x3, [x4], #8
22	b.pl	1b
232:	adds	x2, x2, #4
24	b.mi	3f
25	ldr	w3, [x1], #4
26	sub	x2, x2, #4
27	str	w3, [x4], #4
283:	adds	x2, x2, #2
29	b.mi	4f
30	ldrh	w3, [x1], #2
31	sub	x2, x2, #2
32	strh	w3, [x4], #2
334:	adds	x2, x2, #1
34	b.mi	5f
35	ldrb	w3, [x1]
36	strb	w3, [x4]
375:	ret
38ENDPROC(memcpy)
39