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4224be41d7
Bug: crashpad:30 Change-Id: Id2a6a1868103b0f4374816e58aab365a977b010d Reviewed-on: https://chromium-review.googlesource.com/508836 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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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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#include "snapshot/linux/elf_symbol_table_reader.h"
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#include <elf.h>
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#include "base/logging.h"
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#include "snapshot/linux/elf_image_reader.h"
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namespace crashpad {
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namespace {
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uint8_t GetBinding(const Elf32_Sym& sym) {
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return ELF32_ST_BIND(sym.st_info);
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}
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uint8_t GetBinding(const Elf64_Sym& sym) {
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return ELF64_ST_BIND(sym.st_info);
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}
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uint8_t GetType(const Elf32_Sym& sym) {
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return ELF32_ST_TYPE(sym.st_info);
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}
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uint8_t GetType(const Elf64_Sym& sym) {
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return ELF64_ST_TYPE(sym.st_info);
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}
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uint8_t GetVisibility(const Elf32_Sym& sym) {
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return ELF32_ST_VISIBILITY(sym.st_other);
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}
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uint8_t GetVisibility(const Elf64_Sym& sym) {
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return ELF64_ST_VISIBILITY(sym.st_other);
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}
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} // namespace
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ElfSymbolTableReader::ElfSymbolTableReader(const ProcessMemoryRange* memory,
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ElfImageReader* elf_reader,
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LinuxVMAddress address)
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: memory_(memory), elf_reader_(elf_reader), base_address_(address) {}
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ElfSymbolTableReader::~ElfSymbolTableReader() {}
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bool ElfSymbolTableReader::GetSymbol(const std::string& name,
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SymbolInformation* info) {
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return memory_->Is64Bit() ? ScanSymbolTable<Elf64_Sym>(name, info)
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: ScanSymbolTable<Elf32_Sym>(name, info);
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}
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template <typename SymEnt>
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bool ElfSymbolTableReader::ScanSymbolTable(const std::string& name,
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SymbolInformation* info_out) {
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LinuxVMAddress address = base_address_;
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SymEnt entry;
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std::string string;
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while (memory_->Read(address, sizeof(entry), &entry) &&
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elf_reader_->ReadDynamicStringTableAtOffset(entry.st_name, &string)) {
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if (string == name) {
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info_out->address = entry.st_value;
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info_out->size = entry.st_size;
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info_out->shndx = entry.st_shndx;
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info_out->binding = GetBinding(entry);
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info_out->type = GetType(entry);
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info_out->visibility = GetVisibility(entry);
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return true;
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}
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address += sizeof(entry);
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}
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return false;
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}
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} // namespace crashpad
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