114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
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/*
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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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#include <elf.h>
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#include <string.h>
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#include <memory>
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#include <string>
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#define LOG_TAG "unwind"
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#include <log/log.h>
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#include "Elf.h"
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#include "ElfInterface.h"
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#include "ElfInterfaceArm.h"
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#include "Machine.h"
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#include "Memory.h"
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#include "Regs.h"
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bool Elf::Init() {
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if (!memory_) {
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return false;
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}
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interface_.reset(CreateInterfaceFromMemory(memory_.get()));
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if (!interface_) {
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return false;
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}
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valid_ = interface_->Init();
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if (valid_) {
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interface_->InitHeaders();
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} else {
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interface_.reset(nullptr);
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}
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return valid_;
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}
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bool Elf::IsValidElf(Memory* memory) {
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if (memory == nullptr) {
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return false;
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}
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// Verify that this is a valid elf file.
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uint8_t e_ident[SELFMAG + 1];
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if (!memory->Read(0, e_ident, SELFMAG)) {
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return false;
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}
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if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
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return false;
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}
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return true;
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}
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ElfInterface* Elf::CreateInterfaceFromMemory(Memory* memory) {
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if (!IsValidElf(memory)) {
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return nullptr;
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}
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std::unique_ptr<ElfInterface> interface;
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if (!memory->Read(EI_CLASS, &class_type_, 1)) {
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return nullptr;
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}
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if (class_type_ == ELFCLASS32) {
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Elf32_Half e_machine;
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if (!memory->Read(EI_NIDENT + sizeof(Elf32_Half), &e_machine, sizeof(e_machine))) {
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return nullptr;
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}
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if (e_machine != EM_ARM && e_machine != EM_386) {
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// Unsupported.
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ALOGI("32 bit elf that is neither arm nor x86: e_machine = %d\n", e_machine);
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return nullptr;
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}
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machine_type_ = e_machine;
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if (e_machine == EM_ARM) {
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interface.reset(new ElfInterfaceArm(memory));
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} else {
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interface.reset(new ElfInterface32(memory));
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}
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} else if (class_type_ == ELFCLASS64) {
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Elf64_Half e_machine;
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if (!memory->Read(EI_NIDENT + sizeof(Elf64_Half), &e_machine, sizeof(e_machine))) {
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return nullptr;
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}
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if (e_machine != EM_AARCH64 && e_machine != EM_X86_64) {
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// Unsupported.
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ALOGI("64 bit elf that is neither aarch64 nor x86_64: e_machine = %d\n", e_machine);
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return nullptr;
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}
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machine_type_ = e_machine;
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interface.reset(new ElfInterface64(memory));
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}
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return interface.release();
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}
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