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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/export.h>
#include <asm/alternative-asm.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/regdef.h>
.section .noinstr.text, "ax"
SYM_FUNC_START(memmove)
blt a0, a1, __memcpy /* dst < src, memcpy */
blt a1, a0, __rmemcpy /* src < dst, rmemcpy */
jr ra /* dst == src, return */
SYM_FUNC_END(memmove)
SYM_FUNC_ALIAS(__memmove, memmove)
EXPORT_SYMBOL(memmove)
EXPORT_SYMBOL(__memmove)
_ASM_NOKPROBE(memmove)
_ASM_NOKPROBE(__memmove)
SYM_FUNC_START(__rmemcpy)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __rmemcpy_generic", \
"b __rmemcpy_fast", CPU_FEATURE_UAL
SYM_FUNC_END(__rmemcpy)
_ASM_NOKPROBE(__rmemcpy)
/*
* void *__rmemcpy_generic(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__rmemcpy_generic)
move a3, a0
beqz a2, 2f
add.d a0, a0, a2
add.d a1, a1, a2
1: ld.b t0, a1, -1
st.b t0, a0, -1
addi.d a0, a0, -1
addi.d a1, a1, -1
addi.d a2, a2, -1
bgt a2, zero, 1b
2: move a0, a3
jr ra
SYM_FUNC_END(__rmemcpy_generic)
_ASM_NOKPROBE(__rmemcpy_generic)
/*
* void *__rmemcpy_fast(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__rmemcpy_fast)
sltui t0, a2, 9
bnez t0, __memcpy_small
add.d a3, a1, a2
add.d a2, a0, a2
ld.d a6, a1, 0
ld.d a7, a3, -8
/* align up destination address */
andi t1, a2, 7
sub.d a3, a3, t1
sub.d a5, a2, t1
addi.d a4, a1, 64
bgeu a4, a3, .Llt64
/* copy 64 bytes at a time */
.Lloop64:
ld.d t0, a3, -8
ld.d t1, a3, -16
ld.d t2, a3, -24
ld.d t3, a3, -32
ld.d t4, a3, -40
ld.d t5, a3, -48
ld.d t6, a3, -56
ld.d t7, a3, -64
addi.d a3, a3, -64
st.d t0, a5, -8
st.d t1, a5, -16
st.d t2, a5, -24
st.d t3, a5, -32
st.d t4, a5, -40
st.d t5, a5, -48
st.d t6, a5, -56
st.d t7, a5, -64
addi.d a5, a5, -64
bltu a4, a3, .Lloop64
/* copy the remaining bytes */
.Llt64:
addi.d a4, a1, 32
bgeu a4, a3, .Llt32
ld.d t0, a3, -8
ld.d t1, a3, -16
ld.d t2, a3, -24
ld.d t3, a3, -32
addi.d a3, a3, -32
st.d t0, a5, -8
st.d t1, a5, -16
st.d t2, a5, -24
st.d t3, a5, -32
addi.d a5, a5, -32
.Llt32:
addi.d a4, a1, 16
bgeu a4, a3, .Llt16
ld.d t0, a3, -8
ld.d t1, a3, -16
addi.d a3, a3, -16
st.d t0, a5, -8
st.d t1, a5, -16
addi.d a5, a5, -16
.Llt16:
addi.d a4, a1, 8
bgeu a4, a3, .Llt8
ld.d t0, a3, -8
st.d t0, a5, -8
.Llt8:
st.d a6, a0, 0
st.d a7, a2, -8
/* return */
jr ra
SYM_FUNC_END(__rmemcpy_fast)
_ASM_NOKPROBE(__rmemcpy_fast)
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