mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-09 15:29:16 +00:00
937f659359
The {copy, clear}_user function should returns number of bytes that
could not be {copied, cleared}. So, try to {copy, clear} byte by byte
when ld.{d,w,h} and st.{d,w,h} trapped into an exception.
Reviewed-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Weihao Li <liweihao@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
281 lines
5.3 KiB
ArmAsm
281 lines
5.3 KiB
ArmAsm
/* 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/asm-extable.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/regdef.h>
|
|
|
|
SYM_FUNC_START(__copy_user)
|
|
/*
|
|
* Some CPUs support hardware unaligned access
|
|
*/
|
|
ALTERNATIVE "b __copy_user_generic", \
|
|
"b __copy_user_fast", CPU_FEATURE_UAL
|
|
SYM_FUNC_END(__copy_user)
|
|
|
|
EXPORT_SYMBOL(__copy_user)
|
|
|
|
/*
|
|
* unsigned long __copy_user_generic(void *to, const void *from, size_t n)
|
|
*
|
|
* a0: to
|
|
* a1: from
|
|
* a2: n
|
|
*/
|
|
SYM_FUNC_START(__copy_user_generic)
|
|
beqz a2, 3f
|
|
|
|
1: ld.b t0, a1, 0
|
|
2: st.b t0, a0, 0
|
|
addi.d a0, a0, 1
|
|
addi.d a1, a1, 1
|
|
addi.d a2, a2, -1
|
|
bgtz a2, 1b
|
|
|
|
3: move a0, a2
|
|
jr ra
|
|
|
|
_asm_extable 1b, 3b
|
|
_asm_extable 2b, 3b
|
|
SYM_FUNC_END(__copy_user_generic)
|
|
|
|
/*
|
|
* unsigned long __copy_user_fast(void *to, const void *from, unsigned long n)
|
|
*
|
|
* a0: to
|
|
* a1: from
|
|
* a2: n
|
|
*/
|
|
SYM_FUNC_START(__copy_user_fast)
|
|
sltui t0, a2, 9
|
|
bnez t0, .Lsmall
|
|
|
|
0: ld.d t0, a1, 0
|
|
1: st.d t0, a0, 0
|
|
add.d a3, a1, a2
|
|
add.d a2, a0, a2
|
|
|
|
/* align up destination address */
|
|
andi t1, a0, 7
|
|
sub.d t0, zero, t1
|
|
addi.d t0, t0, 8
|
|
add.d a1, a1, t0
|
|
add.d a0, a0, t0
|
|
|
|
addi.d a4, a3, -64
|
|
bgeu a1, a4, .Llt64
|
|
|
|
/* copy 64 bytes at a time */
|
|
.Lloop64:
|
|
2: ld.d t0, a1, 0
|
|
3: ld.d t1, a1, 8
|
|
4: ld.d t2, a1, 16
|
|
5: ld.d t3, a1, 24
|
|
6: ld.d t4, a1, 32
|
|
7: ld.d t5, a1, 40
|
|
8: ld.d t6, a1, 48
|
|
9: ld.d t7, a1, 56
|
|
10: st.d t0, a0, 0
|
|
11: st.d t1, a0, 8
|
|
12: st.d t2, a0, 16
|
|
13: st.d t3, a0, 24
|
|
14: st.d t4, a0, 32
|
|
15: st.d t5, a0, 40
|
|
16: st.d t6, a0, 48
|
|
17: st.d t7, a0, 56
|
|
addi.d a1, a1, 64
|
|
addi.d a0, a0, 64
|
|
bltu a1, a4, .Lloop64
|
|
|
|
/* copy the remaining bytes */
|
|
.Llt64:
|
|
addi.d a4, a3, -32
|
|
bgeu a1, a4, .Llt32
|
|
18: ld.d t0, a1, 0
|
|
19: ld.d t1, a1, 8
|
|
20: ld.d t2, a1, 16
|
|
21: ld.d t3, a1, 24
|
|
22: st.d t0, a0, 0
|
|
23: st.d t1, a0, 8
|
|
24: st.d t2, a0, 16
|
|
25: st.d t3, a0, 24
|
|
addi.d a1, a1, 32
|
|
addi.d a0, a0, 32
|
|
|
|
.Llt32:
|
|
addi.d a4, a3, -16
|
|
bgeu a1, a4, .Llt16
|
|
26: ld.d t0, a1, 0
|
|
27: ld.d t1, a1, 8
|
|
28: st.d t0, a0, 0
|
|
29: st.d t1, a0, 8
|
|
addi.d a1, a1, 16
|
|
addi.d a0, a0, 16
|
|
|
|
.Llt16:
|
|
addi.d a4, a3, -8
|
|
bgeu a1, a4, .Llt8
|
|
30: ld.d t0, a1, 0
|
|
31: st.d t0, a0, 0
|
|
addi.d a1, a1, 8
|
|
addi.d a0, a0, 8
|
|
|
|
.Llt8:
|
|
32: ld.d t0, a3, -8
|
|
33: st.d t0, a2, -8
|
|
|
|
/* return */
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
.Lsmall:
|
|
pcaddi t0, 8
|
|
slli.d a3, a2, 5
|
|
add.d t0, t0, a3
|
|
jr t0
|
|
|
|
.align 5
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
34: ld.b t0, a1, 0
|
|
35: st.b t0, a0, 0
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
36: ld.h t0, a1, 0
|
|
37: st.h t0, a0, 0
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
38: ld.h t0, a1, 0
|
|
39: ld.b t1, a1, 2
|
|
40: st.h t0, a0, 0
|
|
41: st.b t1, a0, 2
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
42: ld.w t0, a1, 0
|
|
43: st.w t0, a0, 0
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
44: ld.w t0, a1, 0
|
|
45: ld.b t1, a1, 4
|
|
46: st.w t0, a0, 0
|
|
47: st.b t1, a0, 4
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
48: ld.w t0, a1, 0
|
|
49: ld.h t1, a1, 4
|
|
50: st.w t0, a0, 0
|
|
51: st.h t1, a0, 4
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
52: ld.w t0, a1, 0
|
|
53: ld.w t1, a1, 3
|
|
54: st.w t0, a0, 0
|
|
55: st.w t1, a0, 3
|
|
move a0, zero
|
|
jr ra
|
|
|
|
.align 5
|
|
56: ld.d t0, a1, 0
|
|
57: st.d t0, a0, 0
|
|
move a0, zero
|
|
jr ra
|
|
|
|
/* fixup and ex_table */
|
|
.Llarge_fixup:
|
|
sub.d a2, a2, a0
|
|
|
|
.Lsmall_fixup:
|
|
58: ld.b t0, a1, 0
|
|
59: st.b t0, a0, 0
|
|
addi.d a0, a0, 1
|
|
addi.d a1, a1, 1
|
|
addi.d a2, a2, -1
|
|
bgt a2, zero, 58b
|
|
|
|
.Lexit:
|
|
move a0, a2
|
|
jr ra
|
|
|
|
_asm_extable 0b, .Lsmall_fixup
|
|
_asm_extable 1b, .Lsmall_fixup
|
|
_asm_extable 2b, .Llarge_fixup
|
|
_asm_extable 3b, .Llarge_fixup
|
|
_asm_extable 4b, .Llarge_fixup
|
|
_asm_extable 5b, .Llarge_fixup
|
|
_asm_extable 6b, .Llarge_fixup
|
|
_asm_extable 7b, .Llarge_fixup
|
|
_asm_extable 8b, .Llarge_fixup
|
|
_asm_extable 9b, .Llarge_fixup
|
|
_asm_extable 10b, .Llarge_fixup
|
|
_asm_extable 11b, .Llarge_fixup
|
|
_asm_extable 12b, .Llarge_fixup
|
|
_asm_extable 13b, .Llarge_fixup
|
|
_asm_extable 14b, .Llarge_fixup
|
|
_asm_extable 15b, .Llarge_fixup
|
|
_asm_extable 16b, .Llarge_fixup
|
|
_asm_extable 17b, .Llarge_fixup
|
|
_asm_extable 18b, .Llarge_fixup
|
|
_asm_extable 19b, .Llarge_fixup
|
|
_asm_extable 20b, .Llarge_fixup
|
|
_asm_extable 21b, .Llarge_fixup
|
|
_asm_extable 22b, .Llarge_fixup
|
|
_asm_extable 23b, .Llarge_fixup
|
|
_asm_extable 24b, .Llarge_fixup
|
|
_asm_extable 25b, .Llarge_fixup
|
|
_asm_extable 26b, .Llarge_fixup
|
|
_asm_extable 27b, .Llarge_fixup
|
|
_asm_extable 28b, .Llarge_fixup
|
|
_asm_extable 29b, .Llarge_fixup
|
|
_asm_extable 30b, .Llarge_fixup
|
|
_asm_extable 31b, .Llarge_fixup
|
|
_asm_extable 32b, .Llarge_fixup
|
|
_asm_extable 33b, .Llarge_fixup
|
|
_asm_extable 34b, .Lexit
|
|
_asm_extable 35b, .Lexit
|
|
_asm_extable 36b, .Lsmall_fixup
|
|
_asm_extable 37b, .Lsmall_fixup
|
|
_asm_extable 38b, .Lsmall_fixup
|
|
_asm_extable 39b, .Lsmall_fixup
|
|
_asm_extable 40b, .Lsmall_fixup
|
|
_asm_extable 41b, .Lsmall_fixup
|
|
_asm_extable 42b, .Lsmall_fixup
|
|
_asm_extable 43b, .Lsmall_fixup
|
|
_asm_extable 44b, .Lsmall_fixup
|
|
_asm_extable 45b, .Lsmall_fixup
|
|
_asm_extable 46b, .Lsmall_fixup
|
|
_asm_extable 47b, .Lsmall_fixup
|
|
_asm_extable 48b, .Lsmall_fixup
|
|
_asm_extable 49b, .Lsmall_fixup
|
|
_asm_extable 50b, .Lsmall_fixup
|
|
_asm_extable 51b, .Lsmall_fixup
|
|
_asm_extable 52b, .Lsmall_fixup
|
|
_asm_extable 53b, .Lsmall_fixup
|
|
_asm_extable 54b, .Lsmall_fixup
|
|
_asm_extable 55b, .Lsmall_fixup
|
|
_asm_extable 56b, .Lsmall_fixup
|
|
_asm_extable 57b, .Lsmall_fixup
|
|
_asm_extable 58b, .Lexit
|
|
_asm_extable 59b, .Lexit
|
|
SYM_FUNC_END(__copy_user_fast)
|