1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2023 Rivos Inc. */
#include <linux/linkage.h>
#include <asm/asm.h>
.text
/* void __riscv_copy_words_unaligned(void *, const void *, size_t) */
/* Performs a memcpy without aligning buffers, using word loads and stores. */
/* Note: The size is truncated to a multiple of 8 * SZREG */
SYM_FUNC_START(__riscv_copy_words_unaligned)
andi a4, a2, ~((8*SZREG)-1)
beqz a4, 2f
add a3, a1, a4
1:
REG_L a4, 0(a1)
REG_L a5, SZREG(a1)
REG_L a6, 2*SZREG(a1)
REG_L a7, 3*SZREG(a1)
REG_L t0, 4*SZREG(a1)
REG_L t1, 5*SZREG(a1)
REG_L t2, 6*SZREG(a1)
REG_L t3, 7*SZREG(a1)
REG_S a4, 0(a0)
REG_S a5, SZREG(a0)
REG_S a6, 2*SZREG(a0)
REG_S a7, 3*SZREG(a0)
REG_S t0, 4*SZREG(a0)
REG_S t1, 5*SZREG(a0)
REG_S t2, 6*SZREG(a0)
REG_S t3, 7*SZREG(a0)
addi a0, a0, 8*SZREG
addi a1, a1, 8*SZREG
bltu a1, a3, 1b
2:
ret
SYM_FUNC_END(__riscv_copy_words_unaligned)
/* void __riscv_copy_bytes_unaligned(void *, const void *, size_t) */
/* Performs a memcpy without aligning buffers, using only byte accesses. */
/* Note: The size is truncated to a multiple of 8 */
SYM_FUNC_START(__riscv_copy_bytes_unaligned)
andi a4, a2, ~(8-1)
beqz a4, 2f
add a3, a1, a4
1:
lb a4, 0(a1)
lb a5, 1(a1)
lb a6, 2(a1)
lb a7, 3(a1)
lb t0, 4(a1)
lb t1, 5(a1)
lb t2, 6(a1)
lb t3, 7(a1)
sb a4, 0(a0)
sb a5, 1(a0)
sb a6, 2(a0)
sb a7, 3(a0)
sb t0, 4(a0)
sb t1, 5(a0)
sb t2, 6(a0)
sb t3, 7(a0)
addi a0, a0, 8
addi a1, a1, 8
bltu a1, a3, 1b
2:
ret
SYM_FUNC_END(__riscv_copy_bytes_unaligned)
|
