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https://github.com/RGBCube/serenity
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aefd206038
This patch adds SymbolServer, a service daemon that provides symbolication of ELF binaries. It has a very simple IPC API at the moment that only turns addresses into symbol names. This can be used to implement symbolication without having to do in-process ELF parsing yourself. :^)
96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/MappedFile.h>
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#include <LibELF/Image.h>
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#include <SymbolServer/ClientConnection.h>
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#include <SymbolServer/SymbolClientEndpoint.h>
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namespace SymbolServer {
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struct CachedELF {
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NonnullRefPtr<MappedFile> mapped_file;
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ELF::Image elf;
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};
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static HashMap<String, CachedELF> s_cache;
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static HashMap<int, RefPtr<ClientConnection>> s_connections;
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ClientConnection::ClientConnection(NonnullRefPtr<Core::LocalSocket> socket, int client_id)
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: IPC::ClientConnection<SymbolClientEndpoint, SymbolServerEndpoint>(*this, move(socket), client_id)
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{
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s_connections.set(client_id, *this);
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}
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ClientConnection::~ClientConnection()
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{
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}
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void ClientConnection::die()
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{
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s_connections.remove(client_id());
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}
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OwnPtr<Messages::SymbolServer::GreetResponse> ClientConnection::handle(const Messages::SymbolServer::Greet&)
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{
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return make<Messages::SymbolServer::GreetResponse>();
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}
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OwnPtr<Messages::SymbolServer::SymbolicateResponse> ClientConnection::handle(const Messages::SymbolServer::Symbolicate& message)
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{
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auto path = message.path();
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if (!s_cache.contains(path)) {
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auto mapped_file = MappedFile::map(path);
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if (mapped_file.is_error()) {
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dbgln("Failed to map {}: {}", path, mapped_file.error().string());
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return make<Messages::SymbolServer::SymbolicateResponse>(false, Vector<String> {});
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}
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auto elf = ELF::Image(mapped_file.value()->bytes());
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if (!elf.is_valid()) {
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dbgln("ELF not valid: {}", path);
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return make<Messages::SymbolServer::SymbolicateResponse>(false, Vector<String> {});
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}
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auto cached_elf = CachedELF { mapped_file.release_value(), move(elf) };
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s_cache.set(path, move(cached_elf));
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}
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auto it = s_cache.find(path);
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ASSERT(it != s_cache.end());
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auto& cached_elf = it->value;
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Vector<String> symbols;
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symbols.ensure_capacity(message.addresses().size());
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for (auto address : message.addresses()) {
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u32 offset = 0;
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auto symbol = cached_elf.elf.symbolicate(address, &offset);
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symbols.append(move(symbol));
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}
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return make<Messages::SymbolServer::SymbolicateResponse>(true, move(symbols));
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}
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}
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