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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/loongarch/lib/unaligned.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

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 */

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#include <linux/linkage.h>

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#include <asm/asm.h>

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#include <asm/asmmacro.h>

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#include <asm/asm-extable.h>

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#include <asm/errno.h>

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#include <asm/regdef.h>

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.L_fixup_handle_unaligned:

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	li.w	a0, -EFAULT

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	jr	ra

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/*

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 * unsigned long unaligned_read(void *addr, void *value, unsigned long n, bool sign)

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 *

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 * a0: addr

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 * a1: value

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 * a2: n

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 * a3: sign

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 */

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SYM_FUNC_START(unaligned_read)

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	beqz	a2, 5f

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	li.w	t2, 0

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	addi.d	t0, a2, -1

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	slli.d	t1, t0, 3

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	add.d 	a0, a0, t0

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	beqz	a3, 2f

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1:	ld.b	t3, a0, 0

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	b	3f

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2:	ld.bu	t3, a0, 0

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3:	sll.d	t3, t3, t1

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	or	t2, t2, t3

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	addi.d	t1, t1, -8

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	addi.d	a0, a0, -1

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	addi.d	a2, a2, -1

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	bgtz	a2, 2b

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4:	st.d	t2, a1, 0

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	move	a0, a2

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	jr	ra

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5:	li.w    a0, -EFAULT

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	jr	ra

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	_asm_extable 1b, .L_fixup_handle_unaligned

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	_asm_extable 2b, .L_fixup_handle_unaligned

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	_asm_extable 4b, .L_fixup_handle_unaligned

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SYM_FUNC_END(unaligned_read)

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/*

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 * unsigned long unaligned_write(void *addr, unsigned long value, unsigned long n)

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 *

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 * a0: addr

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 * a1: value

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 * a2: n

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 */

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SYM_FUNC_START(unaligned_write)

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	beqz	a2, 3f

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	li.w	t0, 0

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1:	srl.d	t1, a1, t0

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2:	st.b	t1, a0, 0

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	addi.d	t0, t0, 8

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	addi.d	a2, a2, -1

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	addi.d	a0, a0, 1

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	bgtz	a2, 1b

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	move	a0, a2

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	jr	ra

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3:	li.w    a0, -EFAULT

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	jr	ra

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	_asm_extable 2b, .L_fixup_handle_unaligned

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SYM_FUNC_END(unaligned_write)

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