1 /*
2  * Copyright (C) 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef BERBERIS_GUEST_OS_PRIMITIVES_GET_TLS_H_
18 #define BERBERIS_GUEST_OS_PRIMITIVES_GET_TLS_H_
19 
20 namespace berberis {
21 
22 #if defined(__i386__)
23 #define GetTls()                              \
24   ({                                          \
25     void** __val;                             \
26     __asm__("movl %%gs:0, %0" : "=r"(__val)); \
27     __val;                                    \
28   })
29 #elif defined(__x86_64__)
30 #define GetTls()                             \
31   ({                                         \
32     void** __val;                            \
33     __asm__("mov %%fs:0, %0" : "=r"(__val)); \
34     __val;                                   \
35   })
36 #elif defined(__riscv)
37 #define GetTls()                        \
38   ({                                    \
39     void** __val;                       \
40     __asm__("mv %0, tp" : "=r"(__val)); \
41     __val;                              \
42   })
43 #elif defined(__aarch64__)
44 #define GetTls()                                \
45   ({                                            \
46     void** __val;                               \
47     __asm__("mrs %0, tpidr_el0" : "=r"(__val)); \
48     __val;                                      \
49   })
50 #else
51 #error unsupported architecture
52 #endif
53 
54 }  // namespace berberis
55 
56 #endif  // BERBERIS_GUEST_OS_PRIMITIVES_GET_TLS_H_
57