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1;
2; Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
3;
4; Redistribution and use in source and binary forms, with or without modification,
5; are permitted provided that the following conditions are met:
6;
7; 1. Redistributions of source code must retain the above copyright notice, this list of
8;    conditions and the following disclaimer.
9;
10; 2. Redistributions in binary form must reproduce the above copyright notice, this list
11;    of conditions and the following disclaimer in the documentation and/or other materials
12;    provided with the distribution.
13;
14; 3. Neither the name of the copyright holder nor the names of its contributors may be used
15;    to endorse or promote products derived from this software without specific prior written
16;    permission.
17;
18; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
22; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28; ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29;
30
31        EXPORT  ArchAtomicRead
32        EXPORT  ArchAtomicSet
33        EXPORT  ArchAtomicAdd
34        EXPORT  ArchAtomicSub
35        EXPORT  ArchAtomicXchg32bits
36        EXPORT  ArchAtomicCmpXchg32bits
37
38    PRESERVE8
39    AREA  |.text|, CODE, READONLY
40    THUMB
41
42
43        EXPORT  ArchAtomicRead
44        EXPORT  ArchAtomicSet
45        EXPORT  ArchAtomicAdd
46        EXPORT  ArchAtomicSub
47        EXPORT  ArchAtomicXchg32bits
48        EXPORT  ArchAtomicCmpXchg32bits
49
50    PRESERVE8
51    AREA  |.text|, CODE, READONLY
52    THUMB
53
54ArchAtomicRead
55    ldrex r1, [r0]
56    mov r0, r1
57    bx lr
58
59ArchAtomicSet
60    ldrex r2, [r0]
61    strex r3, r1, [r0]
62    teq r3, #0
63    bne ArchAtomicSet
64    bx lr
65
66ArchAtomicAdd
67    ldrex r2, [r0]
68    add r2, r2, r1
69    strex r3, r2, [r0]
70    teq r3, #0
71    bne ArchAtomicAdd
72    mov r0, r2
73    bx lr
74
75ArchAtomicSub
76    ldrex r2, [r0]
77    sub r2, r2, r1
78    strex r3, r2, [r0]
79    teq r3, #0
80    bne ArchAtomicSub
81    mov r0, r2
82    bx lr
83
84ArchAtomicXchg32bits
85    ldrex r2, [r0]
86    strex r3, r1, [r0]
87    teq r3, #0
88    bne ArchAtomicXchg32bits
89    mov r0, r2
90
91ArchAtomicCmpXchg32bits
92    ldrex r3, [r0]
93    cmp r3, r2
94    bne end
95    strex r4, r1, [r0]
96    teq r4, #0
97    bne ArchAtomicCmpXchg32bits
98end
99