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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)
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