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_RUNTIME_PRIMITIVES_HOST_STACK_H_
18 #define BERBERIS_RUNTIME_PRIMITIVES_HOST_STACK_H_
19 
20 #include <cstddef>
21 
22 #include "berberis/base/mmap.h"
23 
24 namespace berberis {
25 
GetStackSizeForTranslation()26 constexpr size_t GetStackSizeForTranslation() {
27   // Ensure thread stack is big enough for translation.
28   // TODO(khim): review this when decoder gets refactored or when translation
29   // goes to a separate thread.
30   // TODO(levarum): Maybe better solution is required (b/30124680).
31   return AlignUpPageSize(16u * 1024u);
32 }
33 
GetStackTop(ScopedMmap * stack)34 inline void* GetStackTop(ScopedMmap* stack) {
35   uintptr_t stack_top = reinterpret_cast<uintptr_t>(stack->data()) + stack->size() - 1;
36   // We assume there is no ABI with stack alignment greater than 64.
37   return reinterpret_cast<void*>(stack_top - (stack_top % 64));
38 }
39 
40 }  // namespace berberis
41 
42 #endif  // BERBERIS_RUNTIME_PRIMITIVES_HOST_STACK_H_
43