Orange Pi5 kernel

/* 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)