| 1 | /* The assembly function for string copy. C-SKY ABIV2 version. |
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| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | ENTRY (strcpy) |
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| 22 | mov a3, a0 |
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| 23 | /* Check if the src addr is aligned. */ |
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| 24 | andi t0, a1, 3 |
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| 25 | bnez t0, 11f |
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| 26 | 1: |
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| 27 | /* Check if all the bytes in the word are not zero. */ |
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| 28 | ldw a2, (a1) |
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| 29 | tstnbz a2 |
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| 30 | bf 9f |
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| 31 | stw a2, (a3) |
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| 32 | |
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| 33 | ldw a2, (a1, 4) |
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| 34 | tstnbz a2 |
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| 35 | bf 2f |
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| 36 | stw a2, (a3, 4) |
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| 37 | |
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| 38 | ldw a2, (a1, 8) |
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| 39 | tstnbz a2 |
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| 40 | bf 3f |
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| 41 | stw a2, (a3, 8) |
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| 42 | |
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| 43 | ldw a2, (a1, 12) |
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| 44 | tstnbz a2 |
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| 45 | bf 4f |
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| 46 | stw a2, (a3, 12) |
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| 47 | |
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| 48 | ldw a2, (a1, 16) |
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| 49 | tstnbz a2 |
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| 50 | bf 5f |
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| 51 | stw a2, (a3, 16) |
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| 52 | |
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| 53 | ldw a2, (a1, 20) |
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| 54 | tstnbz a2 |
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| 55 | bf 6f |
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| 56 | stw a2, (a3, 20) |
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| 57 | |
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| 58 | ldw a2, (a1, 24) |
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| 59 | tstnbz a2 |
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| 60 | bf 7f |
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| 61 | stw a2, (a3, 24) |
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| 62 | |
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| 63 | ldw a2, (a1, 28) |
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| 64 | tstnbz a2 |
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| 65 | bf 8f |
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| 66 | stw a2, (a3, 28) |
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| 67 | |
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| 68 | addi a3, 32 |
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| 69 | addi a1, 32 |
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| 70 | br 1b |
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| 71 | |
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| 72 | 2: |
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| 73 | addi a3, 4 |
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| 74 | br 9f |
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| 75 | |
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| 76 | 3: |
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| 77 | addi a3, 8 |
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| 78 | br 9f |
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| 79 | |
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| 80 | 4: |
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| 81 | addi a3, 12 |
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| 82 | br 9f |
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| 83 | |
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| 84 | 5: |
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| 85 | addi a3, 16 |
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| 86 | br 9f |
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| 87 | |
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| 88 | 6: |
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| 89 | addi a3, 20 |
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| 90 | br 9f |
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| 91 | |
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| 92 | 7: |
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| 93 | addi a3, 24 |
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| 94 | br 9f |
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| 95 | |
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| 96 | 8: |
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| 97 | addi a3, 28 |
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| 98 | 9: |
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| 99 | xtrb3 t0, a2 |
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| 100 | st.b t0, (a3) |
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| 101 | bez t0, 10f |
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| 102 | xtrb2 t0, a2 |
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| 103 | st.b t0, (a3, 1) |
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| 104 | bez t0, 10f |
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| 105 | xtrb1 t0, a2 |
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| 106 | st.b t0, (a3, 2) |
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| 107 | bez t0, 10f |
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| 108 | stw a2, (a3) |
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| 109 | 10: |
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| 110 | jmp lr |
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| 111 | |
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| 112 | 11: |
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| 113 | subi t0, 4 |
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| 114 | 12: |
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| 115 | ld.b a2, (a1) |
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| 116 | st.b a2, (a3) |
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| 117 | bez a2, 10b |
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| 118 | addi t0, 1 |
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| 119 | addi a1, a1, 1 |
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| 120 | addi a3, a3, 1 |
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| 121 | bnez t0, 12b |
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| 122 | br 1b |
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| 123 | |
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| 124 | END (strcpy) |
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| 125 | |
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| 126 | libc_hidden_def (strcpy) |
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| 127 | .weak strcpy |
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| 128 | |
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