]>
Commit | Line | Data |
---|---|---|
5f72b005 | 1 | /* The assembly function for string copy. C-SKY ABIV2 version. |
d614a753 | 2 | Copyright (C) 2018-2020 Free Software Foundation, Inc. |
5f72b005 MH |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5f72b005 MH |
18 | |
19 | #include <sysdep.h> | |
20 | ||
21 | ENTRY (strcpy) | |
22 | mov a3, a0 | |
23 | /* Check if the src addr is aligned. */ | |
24 | andi t0, a1, 3 | |
25 | bnez t0, 11f | |
26 | 1: | |
27 | /* Check if all the bytes in the word are not zero. */ | |
28 | ldw a2, (a1) | |
29 | tstnbz a2 | |
30 | bf 9f | |
31 | stw a2, (a3) | |
32 | ||
33 | ldw a2, (a1, 4) | |
34 | tstnbz a2 | |
35 | bf 2f | |
36 | stw a2, (a3, 4) | |
37 | ||
38 | ldw a2, (a1, 8) | |
39 | tstnbz a2 | |
40 | bf 3f | |
41 | stw a2, (a3, 8) | |
42 | ||
43 | ldw a2, (a1, 12) | |
44 | tstnbz a2 | |
45 | bf 4f | |
46 | stw a2, (a3, 12) | |
47 | ||
48 | ldw a2, (a1, 16) | |
49 | tstnbz a2 | |
50 | bf 5f | |
51 | stw a2, (a3, 16) | |
52 | ||
53 | ldw a2, (a1, 20) | |
54 | tstnbz a2 | |
55 | bf 6f | |
56 | stw a2, (a3, 20) | |
57 | ||
58 | ldw a2, (a1, 24) | |
59 | tstnbz a2 | |
60 | bf 7f | |
61 | stw a2, (a3, 24) | |
62 | ||
63 | ldw a2, (a1, 28) | |
64 | tstnbz a2 | |
65 | bf 8f | |
66 | stw a2, (a3, 28) | |
67 | ||
68 | addi a3, 32 | |
69 | addi a1, 32 | |
70 | br 1b | |
71 | ||
72 | 2: | |
73 | addi a3, 4 | |
74 | br 9f | |
75 | ||
76 | 3: | |
77 | addi a3, 8 | |
78 | br 9f | |
79 | ||
80 | 4: | |
81 | addi a3, 12 | |
82 | br 9f | |
83 | ||
84 | 5: | |
85 | addi a3, 16 | |
86 | br 9f | |
87 | ||
88 | 6: | |
89 | addi a3, 20 | |
90 | br 9f | |
91 | ||
92 | 7: | |
93 | addi a3, 24 | |
94 | br 9f | |
95 | ||
96 | 8: | |
97 | addi a3, 28 | |
98 | 9: | |
99 | xtrb3 t0, a2 | |
100 | st.b t0, (a3) | |
101 | bez t0, 10f | |
102 | xtrb2 t0, a2 | |
103 | st.b t0, (a3, 1) | |
104 | bez t0, 10f | |
105 | xtrb1 t0, a2 | |
106 | st.b t0, (a3, 2) | |
107 | bez t0, 10f | |
108 | stw a2, (a3) | |
109 | 10: | |
110 | jmp lr | |
111 | ||
112 | 11: | |
113 | subi t0, 4 | |
114 | 12: | |
115 | ld.b a2, (a1) | |
116 | st.b a2, (a3) | |
117 | bez a2, 10b | |
118 | addi t0, 1 | |
119 | addi a1, a1, 1 | |
120 | addi a3, a3, 1 | |
121 | bnez t0, 12b | |
122 | br 1b | |
123 | ||
124 | END (strcpy) | |
125 | ||
126 | libc_hidden_def (strcpy) | |
127 | .weak strcpy |