1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* memmove.S: Simple memmove implementation.
3 *
4 * Copyright (C) 1997, 2004 David S. Miller (d
5 * Copyright (C) 1996, 1997, 1998, 1999 Jakub
6 */
7
8 #include <linux/export.h>
9 #include <linux/linkage.h>
10
11 .text
12 ENTRY(memmove) /* o0=dst o1=src o2=len */
13 brz,pn %o2, 99f
14 mov %o0, %g1
15
16 cmp %o0, %o1
17 bleu,pt %xcc, 2f
18 add %o1, %o2, %g7
19 cmp %g7, %o0
20 bleu,pt %xcc, memcpy
21 add %o0, %o2, %o5
22 sub %g7, 1, %o1
23
24 sub %o5, 1, %o0
25 1: ldub [%o1], %g7
26 subcc %o2, 1, %o2
27 sub %o1, 1, %o1
28 stb %g7, [%o0]
29 bne,pt %icc, 1b
30 sub %o0, 1, %o0
31 99:
32 retl
33 mov %g1, %o0
34
35 /* We can't just call memcpy for these
36 * chips the memcpy uses cache initial
37 * and src are close enough, those can
38 * before we've loaded it in.
39 */
40 2: or %o0, %o1, %g7
41 or %o2, %g7, %g7
42 andcc %g7, 0x7, %g0
43 bne,pn %xcc, 4f
44 nop
45
46 3: ldx [%o1], %g7
47 add %o1, 8, %o1
48 subcc %o2, 8, %o2
49 add %o0, 8, %o0
50 bne,pt %icc, 3b
51 stx %g7, [%o0 - 0x8]
52 ba,a,pt %xcc, 99b
53
54 4: ldub [%o1], %g7
55 add %o1, 1, %o1
56 subcc %o2, 1, %o2
57 add %o0, 1, %o0
58 bne,pt %icc, 4b
59 stb %g7, [%o0 - 0x1]
60 ba,a,pt %xcc, 99b
61 ENDPROC(memmove)
62 EXPORT_SYMBOL(memmove)
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