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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
| #include <linux/linkage.h>
| #include "sysdep.h"
|
| ENTRY(strcpy)
| mov a3, a0
| /* Check if the src addr is aligned. */
| andi t0, a1, 3
| bnez t0, 11f
| 1:
| /* Check if all the bytes in the word are not zero. */
| ldw a2, (a1)
| tstnbz a2
| bf 9f
| stw a2, (a3)
|
| ldw a2, (a1, 4)
| tstnbz a2
| bf 2f
| stw a2, (a3, 4)
|
| ldw a2, (a1, 8)
| tstnbz a2
| bf 3f
| stw a2, (a3, 8)
|
| ldw a2, (a1, 12)
| tstnbz a2
| bf 4f
| stw a2, (a3, 12)
|
| ldw a2, (a1, 16)
| tstnbz a2
| bf 5f
| stw a2, (a3, 16)
|
| ldw a2, (a1, 20)
| tstnbz a2
| bf 6f
| stw a2, (a3, 20)
|
| ldw a2, (a1, 24)
| tstnbz a2
| bf 7f
| stw a2, (a3, 24)
|
| ldw a2, (a1, 28)
| tstnbz a2
| bf 8f
| stw a2, (a3, 28)
|
| addi a3, 32
| addi a1, 32
| br 1b
|
|
| 2:
| addi a3, 4
| br 9f
|
| 3:
| addi a3, 8
| br 9f
|
| 4:
| addi a3, 12
| br 9f
|
| 5:
| addi a3, 16
| br 9f
|
| 6:
| addi a3, 20
| br 9f
|
| 7:
| addi a3, 24
| br 9f
|
| 8:
| addi a3, 28
| 9:
| # ifdef __CSKYBE__
| xtrb0 t0, a2
| st.b t0, (a3)
| bez t0, 10f
| xtrb1 t0, a2
| st.b t0, (a3, 1)
| bez t0, 10f
| xtrb2 t0, a2
| st.b t0, (a3, 2)
| bez t0, 10f
| stw a2, (a3)
| # else
| xtrb3 t0, a2
| st.b t0, (a3)
| bez t0, 10f
| xtrb2 t0, a2
| st.b t0, (a3, 1)
| bez t0, 10f
| xtrb1 t0, a2
| st.b t0, (a3, 2)
| bez t0, 10f
| stw a2, (a3)
| # endif /* !__CSKYBE__ */
| 10:
| jmp lr
|
| 11:
| subi t0, 4
| 12:
| ld.b a2, (a1)
| st.b a2, (a3)
| bez a2, 10b
| addi t0, 1
| addi a1, a1, 1
| addi a3, a3, 1
| bnez t0, 12b
| jbr 1b
| ENDPROC(strcpy)
|
|
