| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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| 3 | |
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| 4 | #include <linux/linkage.h> |
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| 5 | #include "sysdep.h" |
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| 6 | |
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| 7 | ENTRY(strcpy) |
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| 8 | mov a3, a0 |
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| 9 | /* Check if the src addr is aligned. */ |
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| 10 | andi t0, a1, 3 |
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| 11 | bnez t0, 11f |
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| 12 | 1: |
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| 13 | /* Check if all the bytes in the word are not zero. */ |
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| 14 | ldw a2, (a1) |
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| 15 | tstnbz a2 |
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| 16 | bf 9f |
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| 17 | stw a2, (a3) |
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| 18 | |
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| 19 | ldw a2, (a1, 4) |
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| 20 | tstnbz a2 |
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| 21 | bf 2f |
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| 22 | stw a2, (a3, 4) |
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| 23 | |
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| 24 | ldw a2, (a1, 8) |
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| 25 | tstnbz a2 |
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| 26 | bf 3f |
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| 27 | stw a2, (a3, 8) |
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| 28 | |
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| 29 | ldw a2, (a1, 12) |
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| 30 | tstnbz a2 |
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| 31 | bf 4f |
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| 32 | stw a2, (a3, 12) |
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| 33 | |
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| 34 | ldw a2, (a1, 16) |
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| 35 | tstnbz a2 |
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| 36 | bf 5f |
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| 37 | stw a2, (a3, 16) |
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| 38 | |
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| 39 | ldw a2, (a1, 20) |
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| 40 | tstnbz a2 |
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| 41 | bf 6f |
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| 42 | stw a2, (a3, 20) |
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| 43 | |
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| 44 | ldw a2, (a1, 24) |
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| 45 | tstnbz a2 |
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| 46 | bf 7f |
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| 47 | stw a2, (a3, 24) |
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| 48 | |
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| 49 | ldw a2, (a1, 28) |
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| 50 | tstnbz a2 |
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| 51 | bf 8f |
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| 52 | stw a2, (a3, 28) |
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| 53 | |
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| 54 | addi a3, 32 |
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| 55 | addi a1, 32 |
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| 56 | br 1b |
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| 57 | |
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| 58 | |
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| 59 | 2: |
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| 60 | addi a3, 4 |
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| 61 | br 9f |
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| 62 | |
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| 63 | 3: |
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| 64 | addi a3, 8 |
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| 65 | br 9f |
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| 66 | |
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| 67 | 4: |
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| 68 | addi a3, 12 |
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| 69 | br 9f |
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| 70 | |
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| 71 | 5: |
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| 72 | addi a3, 16 |
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| 73 | br 9f |
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| 74 | |
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| 75 | 6: |
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| 76 | addi a3, 20 |
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| 77 | br 9f |
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| 78 | |
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| 79 | 7: |
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| 80 | addi a3, 24 |
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| 81 | br 9f |
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| 82 | |
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| 83 | 8: |
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| 84 | addi a3, 28 |
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| 85 | 9: |
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| 86 | # ifdef __CSKYBE__ |
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| 87 | xtrb0 t0, a2 |
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| 88 | st.b t0, (a3) |
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| 89 | bez t0, 10f |
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| 90 | xtrb1 t0, a2 |
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| 91 | st.b t0, (a3, 1) |
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| 92 | bez t0, 10f |
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| 93 | xtrb2 t0, a2 |
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| 94 | st.b t0, (a3, 2) |
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| 95 | bez t0, 10f |
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| 96 | stw a2, (a3) |
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| 97 | # else |
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| 98 | xtrb3 t0, a2 |
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| 99 | st.b t0, (a3) |
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| 100 | bez t0, 10f |
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| 101 | xtrb2 t0, a2 |
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| 102 | st.b t0, (a3, 1) |
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| 103 | bez t0, 10f |
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| 104 | xtrb1 t0, a2 |
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| 105 | st.b t0, (a3, 2) |
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| 106 | bez t0, 10f |
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| 107 | stw a2, (a3) |
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| 108 | # endif /* !__CSKYBE__ */ |
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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 | jbr 1b |
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| 123 | ENDPROC(strcpy) |
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| 124 | |
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