blob: 23b2a918f0f3d0d99db557156a33123489e8c507 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <arch/asm.h>
/*
* Move a buffer from src to test (alignment handled by the hardware).
* If dest <= src, call memcpy, otherwise copy in reverse order.
*
* Parameters:
* x0 - dest
* x1 - src
* x2 - n
* Returns:
* x0 - dest
*/
ENTRY(memmove)
cmp x0, x1
b.ls memcpy
add x4, x0, x2
add x1, x1, x2
subs x2, x2, #8
b.mi 2f
1: ldr x3, [x1, #-8]!
subs x2, x2, #8
str x3, [x4, #-8]!
b.pl 1b
2: adds x2, x2, #4
b.mi 3f
ldr w3, [x1, #-4]!
sub x2, x2, #4
str w3, [x4, #-4]!
3: adds x2, x2, #2
b.mi 4f
ldrh w3, [x1, #-2]!
sub x2, x2, #2
strh w3, [x4, #-2]!
4: adds x2, x2, #1
b.mi 5f
ldrb w3, [x1, #-1]
strb w3, [x4, #-1]
5: ret
ENDPROC(memmove)