9b8f545920
Mark a CIE with a S in its augmentation string as signal frame.
This allows the code to properly handle signal frame data if none
of the signal frame pattern matchers work.
For a signal frame, DwarfSectionImpl<AddressType>::Eval needs to
continue the unwinding even if PC is zero. A zero PC means that the
program has crashed, and we should try to recover the real PC using the
return address on the stack or LR. This behavior is tested by
UnwindOffline.signal_{x86,x86_64}, which modify the libc.so files
so that the signal frame pattern matcher fails and the CIE/FDE
data is used instead.
Test: libunwindstack_test
Change-Id: I4655b070028fd984345311a5e743796f8c30ed36
130 lines
3.3 KiB
C++
130 lines
3.3 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/Arch.h>
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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();
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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 GetGlobalVariableOffset(const std::string& name, uint64_t* memory_offset);
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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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bool* is_signal_frame);
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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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