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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>
#include <unwindstack/Error.h>
#include <unwindstack/SharedString.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,
};
struct ElfTypes32 {
using AddressType = uint32_t;
using Dyn = Elf32_Dyn;
using Ehdr = Elf32_Ehdr;
using Nhdr = Elf32_Nhdr;
using Phdr = Elf32_Phdr;
using Shdr = Elf32_Shdr;
using Sym = Elf32_Sym;
};
struct ElfTypes64 {
using AddressType = uint64_t;
using Dyn = Elf64_Dyn;
using Ehdr = Elf64_Ehdr;
using Nhdr = Elf64_Nhdr;
using Phdr = Elf64_Phdr;
using Shdr = Elf64_Shdr;
using Sym = Elf64_Sym;
};
class ElfInterface {
public:
ElfInterface(Memory* memory) : memory_(memory) {}
virtual ~ElfInterface();
virtual bool Init(int64_t* load_bias) = 0;
virtual void InitHeaders() = 0;
virtual std::string GetSoname() = 0;
virtual bool GetFunctionName(uint64_t addr, SharedString* name, uint64_t* offset) = 0;
virtual bool GetGlobalVariable(const std::string& name, uint64_t* memory_address) = 0;
virtual std::string GetBuildID() = 0;
virtual bool Step(uint64_t rel_pc, Regs* regs, Memory* process_memory, bool* finished,
bool* is_signal_frame);
virtual bool IsValidPc(uint64_t pc);
bool GetTextRange(uint64_t* addr, uint64_t* size);
std::unique_ptr<Memory> CreateGnuDebugdataMemory();
Memory* memory() { return memory_; }
const std::unordered_map<uint64_t, LoadInfo>& pt_loads() { return pt_loads_; }
void SetGnuDebugdataInterface(ElfInterface* interface) { gnu_debugdata_interface_ = interface; }
uint64_t dynamic_offset() { return dynamic_offset_; }
uint64_t dynamic_vaddr_start() { return dynamic_vaddr_start_; }
uint64_t dynamic_vaddr_end() { return dynamic_vaddr_end_; }
uint64_t data_offset() { return data_offset_; }
uint64_t data_vaddr_start() { return data_vaddr_start_; }
uint64_t data_vaddr_end() { return data_vaddr_end_; }
uint64_t eh_frame_hdr_offset() { return eh_frame_hdr_offset_; }
int64_t eh_frame_hdr_section_bias() { return eh_frame_hdr_section_bias_; }
uint64_t eh_frame_hdr_size() { return eh_frame_hdr_size_; }
uint64_t eh_frame_offset() { return eh_frame_offset_; }
int64_t eh_frame_section_bias() { return eh_frame_section_bias_; }
uint64_t eh_frame_size() { return eh_frame_size_; }
uint64_t debug_frame_offset() { return debug_frame_offset_; }
int64_t debug_frame_section_bias() { return debug_frame_section_bias_; }
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_; }
uint64_t gnu_build_id_offset() { return gnu_build_id_offset_; }
uint64_t gnu_build_id_size() { return gnu_build_id_size_; }
DwarfSection* eh_frame() { return eh_frame_.get(); }
DwarfSection* debug_frame() { return debug_frame_.get(); }
const ErrorData& last_error() { return last_error_; }
ErrorCode LastErrorCode() { return last_error_.code; }
uint64_t LastErrorAddress() { return last_error_.address; }
template <typename EhdrType, typename PhdrType>
static int64_t GetLoadBias(Memory* memory);
template <typename EhdrType, typename ShdrType, typename NhdrType>
static std::string ReadBuildIDFromMemory(Memory* memory);
protected:
virtual void HandleUnknownType(uint32_t, uint64_t, uint64_t) {}
Memory* memory_;
std::unordered_map<uint64_t, LoadInfo> pt_loads_;
// Stored elf data.
uint64_t dynamic_offset_ = 0;
uint64_t dynamic_vaddr_start_ = 0;
uint64_t dynamic_vaddr_end_ = 0;
uint64_t data_offset_ = 0;
uint64_t data_vaddr_start_ = 0;
uint64_t data_vaddr_end_ = 0;
uint64_t eh_frame_hdr_offset_ = 0;
int64_t eh_frame_hdr_section_bias_ = 0;
uint64_t eh_frame_hdr_size_ = 0;
uint64_t eh_frame_offset_ = 0;
int64_t eh_frame_section_bias_ = 0;
uint64_t eh_frame_size_ = 0;
uint64_t debug_frame_offset_ = 0;
int64_t debug_frame_section_bias_ = 0;
uint64_t debug_frame_size_ = 0;
uint64_t gnu_debugdata_offset_ = 0;
uint64_t gnu_debugdata_size_ = 0;
uint64_t gnu_build_id_offset_ = 0;
uint64_t gnu_build_id_size_ = 0;
uint64_t text_addr_ = 0;
uint64_t text_size_ = 0;
uint8_t soname_type_ = SONAME_UNKNOWN;
std::string soname_;
ErrorData last_error_{ERROR_NONE, 0};
std::unique_ptr<DwarfSection> eh_frame_;
std::unique_ptr<DwarfSection> debug_frame_;
// The Elf object owns the gnu_debugdata interface object.
ElfInterface* gnu_debugdata_interface_ = nullptr;
std::vector<Symbols*> symbols_;
std::vector<std::pair<uint64_t, uint64_t>> strtabs_;
};
template <typename ElfTypes>
class ElfInterfaceImpl : public ElfInterface {
public:
using AddressType = typename ElfTypes::AddressType;
using DynType = typename ElfTypes::Dyn;
using EhdrType = typename ElfTypes::Ehdr;
using NhdrType = typename ElfTypes::Nhdr;
using PhdrType = typename ElfTypes::Phdr;
using ShdrType = typename ElfTypes::Shdr;
using SymType = typename ElfTypes::Sym;
ElfInterfaceImpl(Memory* memory) : ElfInterface(memory) {}
virtual ~ElfInterfaceImpl() = default;
bool Init(int64_t* load_bias) override { return ReadAllHeaders(load_bias); }
void InitHeaders() override;
std::string GetSoname() override;
bool GetFunctionName(uint64_t addr, SharedString* name, uint64_t* func_offset) override;
bool GetGlobalVariable(const std::string& name, uint64_t* memory_address) override;
std::string GetBuildID() override { return ReadBuildID(); }
static void GetMaxSize(Memory* memory, uint64_t* size);
protected:
bool ReadAllHeaders(int64_t* load_bias);
void ReadProgramHeaders(const EhdrType& ehdr, int64_t* load_bias);
void ReadSectionHeaders(const EhdrType& ehdr);
std::string ReadBuildID();
};
using ElfInterface32 = ElfInterfaceImpl<ElfTypes32>;
using ElfInterface64 = ElfInterfaceImpl<ElfTypes64>;
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_ELF_INTERFACE_H
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