1 /* SPDX-License-Identifier: GPL-2.0 */
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst
3
4 #include <linux/linkage.h>
5 #include "sysdep.h"
6
7 .weak memmove
8 ENTRY(__memmove)
9 ENTRY(memmove)
10 subu r3, r0, r1
11 cmphs r3, r2
12 bt memcpy
13
14 mov r12, r0
15 addu r0, r0, r2
16 addu r1, r1, r2
17
18 /* Test if len less than 4 bytes. */
19 cmplti r2, 4
20 bt .L_copy_by_byte
21
22 andi r13, r0, 3
23 /* Test if dest is not 4 bytes aligned
24 bnez r13, .L_dest_not_aligned
25 /* Hardware can handle unaligned acces
26 .L_dest_aligned:
27 /* If dest is aligned, then copy. */
28 zext r18, r2, 31, 4
29 /* Test if len less than 16 bytes. */
30 bez r18, .L_len_less_16bytes
31 movi r19, 0
32
33 /* len > 16 bytes */
34 LABLE_ALIGN
35 .L_len_larger_16bytes:
36 subi r1, 16
37 subi r0, 16
38 #if defined(__CK860__)
39 ldw r3, (r1, 12)
40 stw r3, (r0, 12)
41 ldw r3, (r1, 8)
42 stw r3, (r0, 8)
43 ldw r3, (r1, 4)
44 stw r3, (r0, 4)
45 ldw r3, (r1, 0)
46 stw r3, (r0, 0)
47 #else
48 ldw r20, (r1, 0)
49 ldw r21, (r1, 4)
50 ldw r22, (r1, 8)
51 ldw r23, (r1, 12)
52 stw r20, (r0, 0)
53 stw r21, (r0, 4)
54 stw r22, (r0, 8)
55 stw r23, (r0, 12)
56 PRE_BNEZAD (r18)
57 #endif
58 BNEZAD (r18, .L_len_larger_16bytes)
59
60 .L_len_less_16bytes:
61 zext r18, r2, 3, 2
62 bez r18, .L_copy_by_byte
63 .L_len_less_16bytes_loop:
64 subi r1, 4
65 subi r0, 4
66 ldw r3, (r1, 0)
67 PRE_BNEZAD (r18)
68 stw r3, (r0, 0)
69 BNEZAD (r18, .L_len_less_16bytes_loop)
70
71 /* Test if len less than 4 bytes. */
72 .L_copy_by_byte:
73 zext r18, r2, 1, 0
74 bez r18, .L_return
75 .L_copy_by_byte_loop:
76 subi r1, 1
77 subi r0, 1
78 ldb r3, (r1, 0)
79 PRE_BNEZAD (r18)
80 stb r3, (r0, 0)
81 BNEZAD (r18, .L_copy_by_byte_loop)
82
83 .L_return:
84 mov r0, r12
85 rts
86
87 /* If dest is not aligned, just copy s
88 align. */
89 .L_dest_not_aligned:
90 sub r2, r13
91 .L_dest_not_aligned_loop:
92 subi r1, 1
93 subi r0, 1
94 /* Makes the dest align. */
95 ldb r3, (r1, 0)
96 PRE_BNEZAD (r13)
97 stb r3, (r0, 0)
98 BNEZAD (r13, .L_dest_not_aligned_loop)
99 cmplti r2, 4
100 bt .L_copy_by_byte
101 /* Check whether the src is aligned.
102 jbr .L_dest_aligned
103 ENDPROC(memmove)
104 ENDPROC(__memmove)
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