72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
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#define ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
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#include <sys/mman.h>
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#include "base/systrace.h"
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#include "base/utils.h" // For CheckedCall
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namespace art {
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namespace jit {
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class JitMemoryRegion;
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static constexpr int kProtR = PROT_READ;
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static constexpr int kProtRW = PROT_READ | PROT_WRITE;
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static constexpr int kProtRWX = PROT_READ | PROT_WRITE | PROT_EXEC;
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static constexpr int kProtRX = PROT_READ | PROT_EXEC;
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// Helper for toggling JIT memory R <-> RW.
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class ScopedCodeCacheWrite : ScopedTrace {
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public:
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explicit ScopedCodeCacheWrite(const JitMemoryRegion& region)
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: ScopedTrace("ScopedCodeCacheWrite"),
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region_(region) {
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if (kIsDebugBuild || !region.HasDualCodeMapping()) {
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ScopedTrace trace("mprotect all");
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const MemMap* const updatable_pages = region.GetUpdatableCodeMapping();
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if (updatable_pages != nullptr) {
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int prot = region.HasDualCodeMapping() ? kProtRW : kProtRWX;
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CheckedCall(mprotect, "Cache +W", updatable_pages->Begin(), updatable_pages->Size(), prot);
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}
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}
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}
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~ScopedCodeCacheWrite() {
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if (kIsDebugBuild || !region_.HasDualCodeMapping()) {
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ScopedTrace trace("mprotect code");
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const MemMap* const updatable_pages = region_.GetUpdatableCodeMapping();
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if (updatable_pages != nullptr) {
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int prot = region_.HasDualCodeMapping() ? kProtR : kProtRX;
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CheckedCall(mprotect, "Cache -W", updatable_pages->Begin(), updatable_pages->Size(), prot);
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}
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}
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}
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private:
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const JitMemoryRegion& region_;
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DISALLOW_COPY_AND_ASSIGN(ScopedCodeCacheWrite);
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};
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} // namespace jit
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} // namespace art
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#endif // ART_RUNTIME_JIT_JIT_SCOPED_CODE_CACHE_WRITE_H_
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