e7ba4cc222
Bug: 23762183 Test: New unit tests pass. Change-Id: Ib67fee879120b5e82889076a0f7221dc429ac140
110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
/*
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* Copyright (C) 2017 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 <assert.h>
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#include <elf.h>
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#include <stdint.h>
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#include <string>
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#include "Memory.h"
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#include "Symbols.h"
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Symbols::Symbols(uint64_t offset, uint64_t size, uint64_t entry_size, uint64_t str_offset,
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uint64_t str_size)
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: cur_offset_(offset),
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offset_(offset),
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end_(offset + size),
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entry_size_(entry_size),
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str_offset_(str_offset),
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str_end_(str_offset_ + str_size) {}
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const Symbols::Info* Symbols::GetInfoFromCache(uint64_t addr) {
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// Binary search the table.
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size_t first = 0;
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size_t last = symbols_.size();
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while (first < last) {
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size_t current = first + (last - first) / 2;
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const Info* info = &symbols_[current];
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if (addr < info->start_offset) {
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last = current;
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} else if (addr < info->end_offset) {
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return info;
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} else {
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first = current + 1;
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}
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}
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return nullptr;
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}
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template <typename SymType>
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bool Symbols::GetName(uint64_t addr, uint64_t load_bias, Memory* elf_memory, std::string* name,
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uint64_t* func_offset) {
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addr += load_bias;
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if (symbols_.size() != 0) {
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const Info* info = GetInfoFromCache(addr);
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if (info) {
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assert(addr >= info->start_offset && addr <= info->end_offset);
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*func_offset = addr - info->start_offset;
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return elf_memory->ReadString(info->str_offset, name, str_end_ - info->str_offset);
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}
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}
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bool symbol_added = false;
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bool return_value = false;
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while (cur_offset_ + entry_size_ <= end_) {
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SymType entry;
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if (!elf_memory->Read(cur_offset_, &entry, sizeof(entry))) {
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// Stop all processing, something looks like it is corrupted.
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cur_offset_ = UINT64_MAX;
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return false;
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}
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cur_offset_ += entry_size_;
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if (entry.st_shndx != SHN_UNDEF && ELF32_ST_TYPE(entry.st_info) == STT_FUNC) {
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// Treat st_value as virtual address.
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uint64_t start_offset = entry.st_value;
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if (entry.st_shndx != SHN_ABS) {
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start_offset += load_bias;
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}
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uint64_t end_offset = start_offset + entry.st_size;
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// Cache the value.
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symbols_.emplace_back(start_offset, end_offset, str_offset_ + entry.st_name);
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symbol_added = true;
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if (addr >= start_offset && addr < end_offset) {
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*func_offset = addr - start_offset;
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uint64_t offset = str_offset_ + entry.st_name;
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if (offset < str_end_) {
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return_value = elf_memory->ReadString(offset, name, str_end_ - offset);
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}
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break;
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}
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}
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}
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if (symbol_added) {
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std::sort(symbols_.begin(), symbols_.end(),
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[](const Info& a, const Info& b) { return a.start_offset < b.start_offset; });
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}
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return return_value;
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}
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// Instantiate all of the needed template functions.
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template bool Symbols::GetName<Elf32_Sym>(uint64_t, uint64_t, Memory*, std::string*, uint64_t*);
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template bool Symbols::GetName<Elf64_Sym>(uint64_t, uint64_t, Memory*, std::string*, uint64_t*);
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