819f13116e
The original code assumed that the load bias in the program headers would be exactly the same as in eh_frame/eh_frame_hdr/debug_frame. This isn't guaranteed, so add a section bias for use when creating a DwarfSection. In addtion, make the load bias and section bias a signed value. There is no reason that this value needs to be positive, so don't force it to be. Add a new offline test that has a different load bias in eh_frame than in the executable load. Add additional unit tests to verify the load bias values are set properly. Clean up the tests in ElfInterfaceTest, making all tests names follow the same convention. Bug: 141888859 Bug: 142094469 Test: New units and old unit tests pass on host and taimen. Change-Id: Ib878123ab5545f0f315c749cfe0d27b012d873ee
138 lines
3.4 KiB
C++
138 lines
3.4 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 <unordered_map>
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#include <utility>
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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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enum ArchEnum : uint8_t {
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ARCH_UNKNOWN = 0,
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ARCH_ARM,
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ARCH_ARM64,
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ARCH_X86,
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ARCH_X86_64,
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ARCH_MIPS,
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ARCH_MIPS64,
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};
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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();
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void InitGnuDebugdata();
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void Invalidate();
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std::string GetSoname();
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bool GetFunctionName(uint64_t addr, std::string* name, uint64_t* func_offset);
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bool GetGlobalVariable(const std::string& name, uint64_t* memory_address);
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uint64_t GetRelPc(uint64_t pc, const MapInfo* map_info);
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bool StepIfSignalHandler(uint64_t rel_pc, Regs* regs, Memory* process_memory);
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bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished);
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ElfInterface* CreateInterfaceFromMemory(Memory* memory);
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std::string GetBuildID();
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int64_t GetLoadBias() { return load_bias_; }
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bool IsValidPc(uint64_t pc);
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void GetLastError(ErrorData* data);
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ErrorCode GetLastErrorCode();
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uint64_t GetLastErrorAddress();
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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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ArchEnum arch() { return arch_; }
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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 bool GetInfo(Memory* memory, uint64_t* size);
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static int64_t GetLoadBias(Memory* memory);
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static std::string GetBuildID(Memory* memory);
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static void SetCachingEnabled(bool enable);
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static bool CachingEnabled() { return cache_enabled_; }
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static void CacheLock();
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static void CacheUnlock();
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static void CacheAdd(MapInfo* info);
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static bool CacheGet(MapInfo* info);
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static bool CacheAfterCreateMemory(MapInfo* info);
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protected:
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bool valid_ = false;
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int64_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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ArchEnum arch_;
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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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static bool cache_enabled_;
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static std::unordered_map<std::string, std::pair<std::shared_ptr<Elf>, bool>>* cache_;
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static std::mutex* cache_lock_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_ELF_H
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