b7de5f5429
Add a static GetLoadBias method to the Elf object that only reads just enough to get the load bias. Add a method to MapInfo that gets the load bias. First attempt to get it if the elf object already exists. If no elf object was created, use the new static method to get the load bias. In BacktraceMap, add a custom iterator so that when code dereferences a map element, that's when the load bias will be retrieved if it hasn't already been set. Bug: 69871050 Test: New unit tests, verify tombstones have non-zero load bias values for Test: libraries with a non-zero load bias. Change-Id: I125f4abc827589957fce2f0df24b0f25d037d732
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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* Copyright (C) 2016 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 _LIBUNWINDSTACK_MAP_INFO_H
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#define _LIBUNWINDSTACK_MAP_INFO_H
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#include <stdint.h>
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#include <mutex>
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#include <string>
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#include <unwindstack/Elf.h>
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namespace unwindstack {
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// Forward declarations.
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class Memory;
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struct MapInfo {
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MapInfo() = default;
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MapInfo(uint64_t start, uint64_t end) : start(start), end(end) {}
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MapInfo(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags, const std::string& name)
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: start(start), end(end), offset(offset), flags(flags), name(name) {}
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~MapInfo() { delete elf; }
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uint64_t start = 0;
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uint64_t end = 0;
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uint64_t offset = 0;
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uint16_t flags = 0;
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std::string name;
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Elf* elf = nullptr;
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// This value is only non-zero if the offset is non-zero but there is
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// no elf signature found at that offset. This indicates that the
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// entire file is represented by the Memory object returned by CreateMemory,
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// instead of a portion of the file.
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uint64_t elf_offset = 0;
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// This function guarantees it will never return nullptr.
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Elf* GetElf(const std::shared_ptr<Memory>& process_memory, bool init_gnu_debugdata = false);
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uint64_t GetLoadBias(const std::shared_ptr<Memory>& process_memory);
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private:
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MapInfo(const MapInfo&) = delete;
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void operator=(const MapInfo&) = delete;
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Memory* GetFileMemory();
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Memory* CreateMemory(const std::shared_ptr<Memory>& process_memory);
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// Protect the creation of the elf object.
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std::mutex mutex_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_MAP_INFO_H
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