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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/linkage.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/asm-extable.h>
#include <asm/errno.h>
#include <asm/regdef.h>
.L_fixup_handle_unaligned:
li.w a0, -EFAULT
jr ra
/*
* unsigned long unaligned_read(void *addr, void *value, unsigned long n, bool sign)
*
* a0: addr
* a1: value
* a2: n
* a3: sign
*/
SYM_FUNC_START(unaligned_read)
beqz a2, 5f
li.w t2, 0
LONG_ADDI t0, a2, -1
PTR_SLLI t1, t0, LONGLOG
PTR_ADD a0, a0, t0
beqz a3, 2f
1: ld.b t3, a0, 0
b 3f
2: ld.bu t3, a0, 0
3: LONG_SLLV t3, t3, t1
or t2, t2, t3
LONG_ADDI t1, t1, -8
PTR_ADDI a0, a0, -1
PTR_ADDI a2, a2, -1
bgtz a2, 2b
4: LONG_S t2, a1, 0
move a0, a2
jr ra
5: li.w a0, -EFAULT
jr ra
_asm_extable 1b, .L_fixup_handle_unaligned
_asm_extable 2b, .L_fixup_handle_unaligned
_asm_extable 4b, .L_fixup_handle_unaligned
SYM_FUNC_END(unaligned_read)
/*
* unsigned long unaligned_write(void *addr, unsigned long value, unsigned long n)
*
* a0: addr
* a1: value
* a2: n
*/
SYM_FUNC_START(unaligned_write)
beqz a2, 3f
li.w t0, 0
1: LONG_SRLV t1, a1, t0
2: st.b t1, a0, 0
LONG_ADDI t0, t0, 8
PTR_ADDI a2, a2, -1
PTR_ADDI a0, a0, 1
bgtz a2, 1b
move a0, a2
jr ra
3: li.w a0, -EFAULT
jr ra
_asm_extable 2b, .L_fixup_handle_unaligned
SYM_FUNC_END(unaligned_write)
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