]>
Commit | Line | Data |
---|---|---|
c5af58b7 GR |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. | |
3 | ||
4 | #include <linux/linkage.h> | |
5 | #include "sysdep.h" | |
6 | ||
7 | .weak memset | |
8 | ENTRY(__memset) | |
9 | ENTRY(memset) | |
10 | /* Test if len less than 4 bytes. */ | |
11 | mov r12, r0 | |
12 | cmplti r2, 8 | |
13 | bt .L_set_by_byte | |
14 | ||
15 | andi r13, r0, 3 | |
16 | movi r19, 4 | |
17 | /* Test if dest is not 4 bytes aligned. */ | |
18 | bnez r13, .L_dest_not_aligned | |
19 | /* Hardware can handle unaligned access directly. */ | |
20 | .L_dest_aligned: | |
21 | zextb r3, r1 | |
22 | lsli r1, 8 | |
23 | or r1, r3 | |
24 | lsli r3, r1, 16 | |
25 | or r3, r1 | |
26 | ||
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 | ||
32 | LABLE_ALIGN | |
33 | .L_len_larger_16bytes: | |
34 | stw r3, (r0, 0) | |
35 | stw r3, (r0, 4) | |
36 | stw r3, (r0, 8) | |
37 | stw r3, (r0, 12) | |
38 | PRE_BNEZAD (r18) | |
39 | addi r0, 16 | |
40 | BNEZAD (r18, .L_len_larger_16bytes) | |
41 | ||
42 | .L_len_less_16bytes: | |
43 | zext r18, r2, 3, 2 | |
44 | andi r2, 3 | |
45 | bez r18, .L_set_by_byte | |
46 | .L_len_less_16bytes_loop: | |
47 | stw r3, (r0, 0) | |
48 | PRE_BNEZAD (r18) | |
49 | addi r0, 4 | |
50 | BNEZAD (r18, .L_len_less_16bytes_loop) | |
51 | ||
52 | /* Test if len less than 4 bytes. */ | |
53 | .L_set_by_byte: | |
54 | zext r18, r2, 2, 0 | |
55 | bez r18, .L_return | |
56 | .L_set_by_byte_loop: | |
57 | stb r1, (r0, 0) | |
58 | PRE_BNEZAD (r18) | |
59 | addi r0, 1 | |
60 | BNEZAD (r18, .L_set_by_byte_loop) | |
61 | ||
62 | .L_return: | |
63 | mov r0, r12 | |
64 | rts | |
65 | ||
66 | /* If dest is not aligned, just set some bytes makes the dest | |
67 | align. */ | |
68 | ||
69 | .L_dest_not_aligned: | |
70 | sub r13, r19, r13 | |
71 | sub r2, r13 | |
72 | .L_dest_not_aligned_loop: | |
73 | /* Makes the dest align. */ | |
74 | stb r1, (r0, 0) | |
75 | PRE_BNEZAD (r13) | |
76 | addi r0, 1 | |
77 | BNEZAD (r13, .L_dest_not_aligned_loop) | |
78 | cmplti r2, 8 | |
79 | bt .L_set_by_byte | |
80 | /* Check whether the src is aligned. */ | |
81 | jbr .L_dest_aligned | |
82 | ENDPROC(memset) | |
83 | ENDPROC(__memset) |