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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stddef.h>
#include <memory>
#include <mutex>
#include <string>
#include <unordered_map>
#include <utility>
#include <unwindstack/Arch.h>
#include <unwindstack/ElfInterface.h>
#include <unwindstack/Memory.h>
#include <unwindstack/SharedString.h>
#if !defined(EM_AARCH64)
#define EM_AARCH64 183
#endif
namespace unwindstack {
// Forward declaration.
class MapInfo;
class Regs;
class Elf {
public:
Elf(Memory* memory) : memory_(memory) {}
virtual ~Elf() = default;
bool Init();
void InitGnuDebugdata();
void Invalidate();
std::string GetSoname();
bool GetFunctionName(uint64_t addr, SharedString* name, uint64_t* func_offset);
bool GetGlobalVariableOffset(const std::string& name, uint64_t* memory_offset);
uint64_t GetRelPc(uint64_t pc, MapInfo* map_info);
bool StepIfSignalHandler(uint64_t rel_pc, Regs* regs, Memory* process_memory);
bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished,
bool* is_signal_frame);
ElfInterface* CreateInterfaceFromMemory(Memory* memory);
std::string GetBuildID();
std::string GetPrintableBuildID();
int64_t GetLoadBias() { return load_bias_; }
bool IsValidPc(uint64_t pc);
bool GetTextRange(uint64_t* addr, uint64_t* size);
void GetLastError(ErrorData* data);
ErrorCode GetLastErrorCode();
uint64_t GetLastErrorAddress();
bool valid() { return valid_; }
uint32_t machine_type() { return machine_type_; }
uint8_t class_type() { return class_type_; }
ArchEnum arch() { return arch_; }
Memory* memory() { return memory_.get(); }
ElfInterface* interface() { return interface_.get(); }
ElfInterface* gnu_debugdata_interface() { return gnu_debugdata_interface_.get(); }
static bool IsValidElf(Memory* memory);
static bool GetInfo(Memory* memory, uint64_t* size);
static int64_t GetLoadBias(Memory* memory);
static std::string GetBuildID(Memory* memory);
// Caching cannot be enabled/disabled while unwinding. It is assumed
// that once enabled, it remains enabled while all unwinds are running.
// If the state of the caching changes while unwinding is occurring,
// it could cause crashes.
static void SetCachingEnabled(bool enable);
static bool CachingEnabled() { return cache_enabled_; }
static void CacheLock();
static void CacheUnlock();
static void CacheAdd(MapInfo* info);
static bool CacheGet(MapInfo* info);
static std::string GetPrintableBuildID(std::string& build_id);
protected:
bool valid_ = false;
int64_t load_bias_ = 0;
std::unique_ptr<ElfInterface> interface_;
std::unique_ptr<Memory> memory_;
uint32_t machine_type_;
uint8_t class_type_;
ArchEnum arch_;
// Protect calls that can modify internal state of the interface object.
std::mutex lock_;
std::unique_ptr<Memory> gnu_debugdata_memory_;
std::unique_ptr<ElfInterface> gnu_debugdata_interface_;
static bool cache_enabled_;
static std::unordered_map<std::string, std::unordered_map<uint64_t, std::shared_ptr<Elf>>>*
cache_;
static std::mutex* cache_lock_;
};
} // namespace unwindstack
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