1  /* SPDX-License-Identifier: GPL-2.0-only */
 2  
 3  #include <arch/asm.h>
 4  /*
 5   * Move a buffer from src to test (alignment handled by the hardware).
 6   * If dest <= src, call memcpy, otherwise copy in reverse order.
 7   *
 8   * Parameters:
 9   *	x0 - dest
10   *	x1 - src
11   *	x2 - n
12   * Returns:
13   *	x0 - dest
14   */
15  ENTRY(memmove)
16  	cmp	x0, x1
17  	b.ls	memcpy
18  	add	x4, x0, x2
19  	add	x1, x1, x2
20  	subs	x2, x2, #8
21  	b.mi	2f
22  1:	ldr	x3, [x1, #-8]!
23  	subs	x2, x2, #8
24  	str	x3, [x4, #-8]!
25  	b.pl	1b
26  2:	adds	x2, x2, #4
27  	b.mi	3f
28  	ldr	w3, [x1, #-4]!
29  	sub	x2, x2, #4
30  	str	w3, [x4, #-4]!
31  3:	adds	x2, x2, #2
32  	b.mi	4f
33  	ldrh	w3, [x1, #-2]!
34  	sub	x2, x2, #2
35  	strh	w3, [x4, #-2]!
36  4:	adds	x2, x2, #1
37  	b.mi	5f
38  	ldrb	w3, [x1, #-1]
39  	strb	w3, [x4, #-1]
40  5:	ret
41  ENDPROC(memmove)