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
95 lines
2.4 KiB
C++
95 lines
2.4 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_ELF_H
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#define _LIBUNWINDSTACK_ELF_H
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#include <stddef.h>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <unwindstack/ElfInterface.h>
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#include <unwindstack/Memory.h>
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#if !defined(EM_AARCH64)
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#define EM_AARCH64 183
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#endif
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namespace unwindstack {
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// Forward declaration.
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struct MapInfo;
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class Regs;
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class Elf {
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public:
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Elf(Memory* memory) : memory_(memory) {}
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virtual ~Elf() = default;
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bool Init(bool init_gnu_debugdata);
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void InitGnuDebugdata();
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bool GetSoname(std::string* name);
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bool GetFunctionName(uint64_t addr, std::string* name, uint64_t* func_offset);
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uint64_t GetRelPc(uint64_t pc, const MapInfo* map_info);
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bool Step(uint64_t rel_pc, uint64_t adjusted_rel_pc, uint64_t elf_offset, Regs* regs,
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Memory* process_memory, bool* finished);
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ElfInterface* CreateInterfaceFromMemory(Memory* memory);
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uint64_t GetLoadBias() { return load_bias_; }
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bool valid() { return valid_; }
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uint32_t machine_type() { return machine_type_; }
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uint8_t class_type() { return class_type_; }
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Memory* memory() { return memory_.get(); }
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ElfInterface* interface() { return interface_.get(); }
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ElfInterface* gnu_debugdata_interface() { return gnu_debugdata_interface_.get(); }
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static bool IsValidElf(Memory* memory);
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static void GetInfo(Memory* memory, bool* valid, uint64_t* size);
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static uint64_t GetLoadBias(Memory* memory);
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protected:
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bool valid_ = false;
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uint64_t load_bias_ = 0;
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std::unique_ptr<ElfInterface> interface_;
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std::unique_ptr<Memory> memory_;
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uint32_t machine_type_;
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uint8_t class_type_;
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// Protect calls that can modify internal state of the interface object.
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std::mutex lock_;
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std::unique_ptr<Memory> gnu_debugdata_memory_;
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std::unique_ptr<ElfInterface> gnu_debugdata_interface_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_ELF_H
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