b9de87f7ed
If a function crashes by jumping into unexecutable code, the old method could not unwind through that. Add a fallback method to set the pc from the default return address location. In addition, add a new finished check for steps. This will provide a method to indicate that this step is the last step. This prevents cases where the fallback method might be triggered incorrectly. Update the libbacktrace code to unwind using the new methodology. Update the unwind tool to use the new unwind methodology. Add a new option to crasher that calls through a null function. Create a new object, Unwinder, that encapsulates the a basic unwind. For now, libbacktrace will still use the custom code. Added new unit tests to cover the new cases. Also add a test that crashes calling a nullptr as a function, and then has call frames in the signal stack. Bug: 65842173 Test: Pass all unit tests, verify crasher dumps properly. Change-Id: Ia18430ab107e9f7bdf0e14a9b74710b1280bd7f4
88 lines
2.2 KiB
C++
88 lines
2.2 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 <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();
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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, Regs* regs, Memory* process_memory, bool* finished);
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ElfInterface* CreateInterfaceFromMemory(Memory* memory);
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uint64_t GetLoadBias();
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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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protected:
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bool valid_ = false;
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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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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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