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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/csky/abiv2/strcpy.S
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/* SPDX-License-Identifier: GPL-2.0 */

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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

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#include <linux/linkage.h>

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#include "sysdep.h"

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ENTRY(strcpy)

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	mov	a3, a0

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	/* Check if the src addr is aligned.  */

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        andi    t0, a1, 3

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        bnez	t0, 11f

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1:

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	/* Check if all the bytes in the word are not zero.  */

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	ldw	a2, (a1)

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	tstnbz	a2

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	bf	9f

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	stw	a2, (a3)

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	ldw	a2, (a1, 4)

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	tstnbz	a2

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	bf	2f

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	stw	a2, (a3, 4)

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	ldw	a2, (a1, 8)

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	tstnbz	a2

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	bf	3f

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	stw	a2, (a3, 8)

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	ldw	a2, (a1, 12)

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	tstnbz	a2

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	bf	4f

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	stw	a2, (a3, 12)

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	ldw	a2, (a1, 16)

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	tstnbz	a2

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	bf	5f

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	stw	a2, (a3, 16)

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	ldw	a2, (a1, 20)

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	tstnbz	a2

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	bf	6f

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	stw	a2, (a3, 20)

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	ldw	a2, (a1, 24)

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	tstnbz	a2

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	bf	7f

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	stw	a2, (a3, 24)

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	ldw	a2, (a1, 28)

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	tstnbz	a2

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	bf	8f

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	stw	a2, (a3, 28)

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	addi	a3, 32

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	addi	a1, 32

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	br	1b

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2:

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	addi	a3, 4

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	br	9f

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3:

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	addi	a3, 8

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	br	9f

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4:

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	addi	a3, 12

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	br	9f

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5:

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	addi	a3, 16

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	br	9f

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6:

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	addi	a3, 20

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	br	9f

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7:

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	addi	a3, 24

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	br	9f

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8:

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	addi	a3, 28

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9:

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# ifdef __CSKYBE__

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	xtrb0	t0, a2

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	st.b	t0, (a3)

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	bez	t0, 10f

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	xtrb1	t0, a2

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	st.b	t0, (a3, 1)

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	bez	t0, 10f

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	xtrb2	t0, a2

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	st.b	t0, (a3, 2)

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	bez	t0, 10f

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	stw	a2, (a3)

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# else

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	xtrb3	t0, a2

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	st.b	t0, (a3)

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	bez	t0, 10f

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	xtrb2	t0, a2

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	st.b	t0, (a3, 1)

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	bez	t0, 10f

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	xtrb1	t0, a2

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	st.b	t0, (a3, 2)

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	bez	t0, 10f

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	stw	a2, (a3)

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# endif	/* !__CSKYBE__ */

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10:

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	jmp	lr

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11:

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	subi    t0, 4

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12:

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        ld.b    a2, (a1)

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        st.b	a2, (a3)

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        bez	a2, 10b

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	addi    t0, 1

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        addi    a1, a1, 1

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        addi    a3, a3, 1

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	bnez	t0, 12b

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	jbr	1b

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ENDPROC(strcpy)

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