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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.
*/
#ifndef _LIBUNWINDSTACK_ELF_INTERFACE_H
#define _LIBUNWINDSTACK_ELF_INTERFACE_H
#include <elf.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include <unwindstack/DwarfSection.h>
namespace unwindstack {
// Forward declarations.
class Memory;
class Regs;
class Symbols;
struct LoadInfo {
uint64_t offset;
uint64_t table_offset;
size_t table_size;
};
enum : uint8_t {
SONAME_UNKNOWN = 0,
SONAME_VALID,
SONAME_INVALID,
};
class ElfInterface {
public:
ElfInterface(Memory* memory) : memory_(memory) {}
virtual ~ElfInterface();
virtual bool Init(uint64_t* load_bias) = 0;
virtual void InitHeaders() = 0;
virtual bool GetSoname(std::string* name) = 0;
virtual bool GetFunctionName(uint64_t addr, uint64_t load_bias, std::string* name,
uint64_t* offset) = 0;
virtual bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished);
Memory* CreateGnuDebugdataMemory();
Memory* memory() { return memory_; }
const std::unordered_map<uint64_t, LoadInfo>& pt_loads() { return pt_loads_; }
uint64_t dynamic_offset() { return dynamic_offset_; }
uint64_t dynamic_size() { return dynamic_size_; }
uint64_t eh_frame_hdr_offset() { return eh_frame_hdr_offset_; }
uint64_t eh_frame_hdr_size() { return eh_frame_hdr_size_; }
uint64_t eh_frame_offset() { return eh_frame_offset_; }
uint64_t eh_frame_size() { return eh_frame_size_; }
uint64_t debug_frame_offset() { return debug_frame_offset_; }
uint64_t debug_frame_size() { return debug_frame_size_; }
uint64_t gnu_debugdata_offset() { return gnu_debugdata_offset_; }
uint64_t gnu_debugdata_size() { return gnu_debugdata_size_; }
DwarfSection* eh_frame() { return eh_frame_.get(); }
DwarfSection* debug_frame() { return debug_frame_.get(); }
template <typename EhdrType, typename PhdrType>
static uint64_t GetLoadBias(Memory* memory);
protected:
template <typename AddressType>
void InitHeadersWithTemplate();
template <typename EhdrType, typename PhdrType, typename ShdrType>
bool ReadAllHeaders(uint64_t* load_bias);
template <typename EhdrType, typename PhdrType>
bool ReadProgramHeaders(const EhdrType& ehdr, uint64_t* load_bias);
template <typename EhdrType, typename ShdrType>
bool ReadSectionHeaders(const EhdrType& ehdr);
template <typename DynType>
bool GetSonameWithTemplate(std::string* soname);
template <typename SymType>
bool GetFunctionNameWithTemplate(uint64_t addr, uint64_t load_bias, std::string* name,
uint64_t* func_offset);
virtual bool HandleType(uint64_t, uint32_t, uint64_t) { return false; }
template <typename EhdrType>
static void GetMaxSizeWithTemplate(Memory* memory, uint64_t* size);
Memory* memory_;
std::unordered_map<uint64_t, LoadInfo> pt_loads_;
// Stored elf data.
uint64_t dynamic_offset_ = 0;
uint64_t dynamic_size_ = 0;
uint64_t eh_frame_hdr_offset_ = 0;
uint64_t eh_frame_hdr_size_ = 0;
uint64_t eh_frame_offset_ = 0;
uint64_t eh_frame_size_ = 0;
uint64_t debug_frame_offset_ = 0;
uint64_t debug_frame_size_ = 0;
uint64_t gnu_debugdata_offset_ = 0;
uint64_t gnu_debugdata_size_ = 0;
uint8_t soname_type_ = SONAME_UNKNOWN;
std::string soname_;
std::unique_ptr<DwarfSection> eh_frame_;
std::unique_ptr<DwarfSection> debug_frame_;
std::vector<Symbols*> symbols_;
};
class ElfInterface32 : public ElfInterface {
public:
ElfInterface32(Memory* memory) : ElfInterface(memory) {}
virtual ~ElfInterface32() = default;
bool Init(uint64_t* load_bias) override {
return ElfInterface::ReadAllHeaders<Elf32_Ehdr, Elf32_Phdr, Elf32_Shdr>(load_bias);
}
void InitHeaders() override { ElfInterface::InitHeadersWithTemplate<uint32_t>(); }
bool GetSoname(std::string* soname) override {
return ElfInterface::GetSonameWithTemplate<Elf32_Dyn>(soname);
}
bool GetFunctionName(uint64_t addr, uint64_t load_bias, std::string* name,
uint64_t* func_offset) override {
return ElfInterface::GetFunctionNameWithTemplate<Elf32_Sym>(addr, load_bias, name, func_offset);
}
static void GetMaxSize(Memory* memory, uint64_t* size) {
GetMaxSizeWithTemplate<Elf32_Ehdr>(memory, size);
}
};
class ElfInterface64 : public ElfInterface {
public:
ElfInterface64(Memory* memory) : ElfInterface(memory) {}
virtual ~ElfInterface64() = default;
bool Init(uint64_t* load_bias) override {
return ElfInterface::ReadAllHeaders<Elf64_Ehdr, Elf64_Phdr, Elf64_Shdr>(load_bias);
}
void InitHeaders() override { ElfInterface::InitHeadersWithTemplate<uint64_t>(); }
bool GetSoname(std::string* soname) override {
return ElfInterface::GetSonameWithTemplate<Elf64_Dyn>(soname);
}
bool GetFunctionName(uint64_t addr, uint64_t load_bias, std::string* name,
uint64_t* func_offset) override {
return ElfInterface::GetFunctionNameWithTemplate<Elf64_Sym>(addr, load_bias, name, func_offset);
}
static void GetMaxSize(Memory* memory, uint64_t* size) {
GetMaxSizeWithTemplate<Elf64_Ehdr>(memory, size);
}
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_ELF_INTERFACE_H
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