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1391 lines
51 KiB
1391 lines
51 KiB
4 months ago
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//===-- GDBRemoteCommunication.cpp ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "GDBRemoteCommunication.h"
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#include <future>
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#include <limits.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Host/Config.h"
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#include "lldb/Host/ConnectionFileDescriptor.h"
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Host/Pipe.h"
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#include "lldb/Host/ProcessLaunchInfo.h"
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#include "lldb/Host/Socket.h"
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#include "lldb/Host/StringConvert.h"
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#include "lldb/Host/ThreadLauncher.h"
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#include "lldb/Host/common/TCPSocket.h"
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#include "lldb/Host/posix/ConnectionFileDescriptorPosix.h"
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#include "lldb/Target/Platform.h"
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#include "lldb/Utility/Event.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/RegularExpression.h"
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#include "lldb/Utility/Reproducer.h"
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#include "lldb/Utility/StreamString.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/ScopedPrinter.h"
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#include "ProcessGDBRemoteLog.h"
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#if defined(__APPLE__)
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#define DEBUGSERVER_BASENAME "debugserver"
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#elif defined(_WIN32)
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#define DEBUGSERVER_BASENAME "lldb-server.exe"
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#else
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#define DEBUGSERVER_BASENAME "lldb-server"
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#endif
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#if defined(HAVE_LIBCOMPRESSION)
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#include <compression.h>
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#endif
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#if LLVM_ENABLE_ZLIB
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#include <zlib.h>
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#endif
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::process_gdb_remote;
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// GDBRemoteCommunication constructor
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GDBRemoteCommunication::GDBRemoteCommunication(const char *comm_name,
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const char *listener_name)
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: Communication(comm_name),
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#ifdef LLDB_CONFIGURATION_DEBUG
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m_packet_timeout(1000),
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#else
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m_packet_timeout(1),
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#endif
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m_echo_number(0), m_supports_qEcho(eLazyBoolCalculate), m_history(512),
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m_send_acks(true), m_compression_type(CompressionType::None),
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m_listen_url() {
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}
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// Destructor
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GDBRemoteCommunication::~GDBRemoteCommunication() {
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if (IsConnected()) {
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Disconnect();
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}
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#if defined(HAVE_LIBCOMPRESSION)
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if (m_decompression_scratch)
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free (m_decompression_scratch);
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#endif
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// Stop the communications read thread which is used to parse all incoming
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// packets. This function will block until the read thread returns.
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if (m_read_thread_enabled)
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StopReadThread();
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}
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char GDBRemoteCommunication::CalculcateChecksum(llvm::StringRef payload) {
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int checksum = 0;
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for (char c : payload)
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checksum += c;
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return checksum & 255;
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}
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size_t GDBRemoteCommunication::SendAck() {
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Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
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ConnectionStatus status = eConnectionStatusSuccess;
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char ch = '+';
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const size_t bytes_written = Write(&ch, 1, status, nullptr);
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LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch);
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m_history.AddPacket(ch, GDBRemotePacket::ePacketTypeSend, bytes_written);
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return bytes_written;
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}
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size_t GDBRemoteCommunication::SendNack() {
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Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
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ConnectionStatus status = eConnectionStatusSuccess;
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char ch = '-';
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const size_t bytes_written = Write(&ch, 1, status, nullptr);
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LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch);
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m_history.AddPacket(ch, GDBRemotePacket::ePacketTypeSend, bytes_written);
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return bytes_written;
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}
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::SendPacketNoLock(llvm::StringRef payload) {
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StreamString packet(0, 4, eByteOrderBig);
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packet.PutChar('$');
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packet.Write(payload.data(), payload.size());
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packet.PutChar('#');
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packet.PutHex8(CalculcateChecksum(payload));
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std::string packet_str = std::string(packet.GetString());
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return SendRawPacketNoLock(packet_str);
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}
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::SendRawPacketNoLock(llvm::StringRef packet,
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bool skip_ack) {
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if (IsConnected()) {
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Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
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ConnectionStatus status = eConnectionStatusSuccess;
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const char *packet_data = packet.data();
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const size_t packet_length = packet.size();
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size_t bytes_written = Write(packet_data, packet_length, status, nullptr);
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if (log) {
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size_t binary_start_offset = 0;
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if (strncmp(packet_data, "$vFile:pwrite:", strlen("$vFile:pwrite:")) ==
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0) {
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const char *first_comma = strchr(packet_data, ',');
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if (first_comma) {
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const char *second_comma = strchr(first_comma + 1, ',');
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if (second_comma)
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binary_start_offset = second_comma - packet_data + 1;
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}
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}
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// If logging was just enabled and we have history, then dump out what we
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// have to the log so we get the historical context. The Dump() call that
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// logs all of the packet will set a boolean so that we don't dump this
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// more than once
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if (!m_history.DidDumpToLog())
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m_history.Dump(log);
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if (binary_start_offset) {
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StreamString strm;
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// Print non binary data header
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strm.Printf("<%4" PRIu64 "> send packet: %.*s", (uint64_t)bytes_written,
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(int)binary_start_offset, packet_data);
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const uint8_t *p;
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// Print binary data exactly as sent
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for (p = (const uint8_t *)packet_data + binary_start_offset; *p != '#';
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++p)
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strm.Printf("\\x%2.2x", *p);
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// Print the checksum
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strm.Printf("%*s", (int)3, p);
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log->PutString(strm.GetString());
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} else
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LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %.*s",
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(uint64_t)bytes_written, (int)packet_length, packet_data);
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}
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m_history.AddPacket(packet.str(), packet_length,
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GDBRemotePacket::ePacketTypeSend, bytes_written);
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if (bytes_written == packet_length) {
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if (!skip_ack && GetSendAcks())
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return GetAck();
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else
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return PacketResult::Success;
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} else {
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LLDB_LOGF(log, "error: failed to send packet: %.*s", (int)packet_length,
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packet_data);
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}
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}
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return PacketResult::ErrorSendFailed;
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}
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GDBRemoteCommunication::PacketResult GDBRemoteCommunication::GetAck() {
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StringExtractorGDBRemote packet;
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PacketResult result = ReadPacket(packet, GetPacketTimeout(), false);
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if (result == PacketResult::Success) {
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if (packet.GetResponseType() ==
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StringExtractorGDBRemote::ResponseType::eAck)
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return PacketResult::Success;
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else
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return PacketResult::ErrorSendAck;
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}
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return result;
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}
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::ReadPacketWithOutputSupport(
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StringExtractorGDBRemote &response, Timeout<std::micro> timeout,
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bool sync_on_timeout,
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llvm::function_ref<void(llvm::StringRef)> output_callback) {
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auto result = ReadPacket(response, timeout, sync_on_timeout);
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while (result == PacketResult::Success && response.IsNormalResponse() &&
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response.PeekChar() == 'O') {
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response.GetChar();
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std::string output;
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if (response.GetHexByteString(output))
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output_callback(output);
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result = ReadPacket(response, timeout, sync_on_timeout);
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}
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return result;
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}
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::ReadPacket(StringExtractorGDBRemote &response,
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Timeout<std::micro> timeout,
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bool sync_on_timeout) {
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if (m_read_thread_enabled)
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return PopPacketFromQueue(response, timeout);
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else
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return WaitForPacketNoLock(response, timeout, sync_on_timeout);
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}
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// This function is called when a packet is requested.
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// A whole packet is popped from the packet queue and returned to the caller.
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// Packets are placed into this queue from the communication read thread. See
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// GDBRemoteCommunication::AppendBytesToCache.
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::PopPacketFromQueue(StringExtractorGDBRemote &response,
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Timeout<std::micro> timeout) {
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auto pred = [&] { return !m_packet_queue.empty() && IsConnected(); };
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// lock down the packet queue
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std::unique_lock<std::mutex> lock(m_packet_queue_mutex);
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if (!timeout)
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m_condition_queue_not_empty.wait(lock, pred);
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else {
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if (!m_condition_queue_not_empty.wait_for(lock, *timeout, pred))
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return PacketResult::ErrorReplyTimeout;
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if (!IsConnected())
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return PacketResult::ErrorDisconnected;
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}
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// get the front element of the queue
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response = m_packet_queue.front();
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// remove the front element
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m_packet_queue.pop();
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// we got a packet
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return PacketResult::Success;
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}
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GDBRemoteCommunication::PacketResult
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GDBRemoteCommunication::WaitForPacketNoLock(StringExtractorGDBRemote &packet,
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Timeout<std::micro> timeout,
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bool sync_on_timeout) {
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uint8_t buffer[8192];
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Status error;
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Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
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// Check for a packet from our cache first without trying any reading...
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if (CheckForPacket(nullptr, 0, packet) != PacketType::Invalid)
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return PacketResult::Success;
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bool timed_out = false;
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bool disconnected = false;
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while (IsConnected() && !timed_out) {
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lldb::ConnectionStatus status = eConnectionStatusNoConnection;
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size_t bytes_read = Read(buffer, sizeof(buffer), timeout, status, &error);
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LLDB_LOGV(log,
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"Read(buffer, sizeof(buffer), timeout = {0}, "
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"status = {1}, error = {2}) => bytes_read = {3}",
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timeout, Communication::ConnectionStatusAsString(status), error,
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bytes_read);
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if (bytes_read > 0) {
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if (CheckForPacket(buffer, bytes_read, packet) != PacketType::Invalid)
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return PacketResult::Success;
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} else {
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switch (status) {
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case eConnectionStatusTimedOut:
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case eConnectionStatusInterrupted:
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if (sync_on_timeout) {
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/// Sync the remote GDB server and make sure we get a response that
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/// corresponds to what we send.
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///
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/// Sends a "qEcho" packet and makes sure it gets the exact packet
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/// echoed back. If the qEcho packet isn't supported, we send a qC
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/// packet and make sure we get a valid thread ID back. We use the
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/// "qC" packet since its response if very unique: is responds with
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/// "QC%x" where %x is the thread ID of the current thread. This
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/// makes the response unique enough from other packet responses to
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/// ensure we are back on track.
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///
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/// This packet is needed after we time out sending a packet so we
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/// can ensure that we are getting the response for the packet we
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/// are sending. There are no sequence IDs in the GDB remote
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/// protocol (there used to be, but they are not supported anymore)
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/// so if you timeout sending packet "abc", you might then send
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/// packet "cde" and get the response for the previous "abc" packet.
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/// Many responses are "OK" or "" (unsupported) or "EXX" (error) so
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/// many responses for packets can look like responses for other
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/// packets. So if we timeout, we need to ensure that we can get
|
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/// back on track. If we can't get back on track, we must
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/// disconnect.
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bool sync_success = false;
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bool got_actual_response = false;
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// We timed out, we need to sync back up with the
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char echo_packet[32];
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int echo_packet_len = 0;
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RegularExpression response_regex;
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if (m_supports_qEcho == eLazyBoolYes) {
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echo_packet_len = ::snprintf(echo_packet, sizeof(echo_packet),
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"qEcho:%u", ++m_echo_number);
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std::string regex_str = "^";
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regex_str += echo_packet;
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regex_str += "$";
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response_regex = RegularExpression(regex_str);
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} else {
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echo_packet_len =
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::snprintf(echo_packet, sizeof(echo_packet), "qC");
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response_regex =
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RegularExpression(llvm::StringRef("^QC[0-9A-Fa-f]+$"));
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}
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PacketResult echo_packet_result =
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SendPacketNoLock(llvm::StringRef(echo_packet, echo_packet_len));
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if (echo_packet_result == PacketResult::Success) {
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const uint32_t max_retries = 3;
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uint32_t successful_responses = 0;
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for (uint32_t i = 0; i < max_retries; ++i) {
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StringExtractorGDBRemote echo_response;
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echo_packet_result =
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WaitForPacketNoLock(echo_response, timeout, false);
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if (echo_packet_result == PacketResult::Success) {
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++successful_responses;
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if (response_regex.Execute(echo_response.GetStringRef())) {
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sync_success = true;
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break;
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} else if (successful_responses == 1) {
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// We got something else back as the first successful
|
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// response, it probably is the response to the packet we
|
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// actually wanted, so copy it over if this is the first
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// success and continue to try to get the qEcho response
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packet = echo_response;
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got_actual_response = true;
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}
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} else if (echo_packet_result == PacketResult::ErrorReplyTimeout)
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continue; // Packet timed out, continue waiting for a response
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else
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break; // Something else went wrong getting the packet back, we
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// failed and are done trying
|
||
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}
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}
|
||
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||
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// We weren't able to sync back up with the server, we must abort
|
||
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// otherwise all responses might not be from the right packets...
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||
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if (sync_success) {
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// We timed out, but were able to recover
|
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if (got_actual_response) {
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// We initially timed out, but we did get a response that came in
|
||
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// before the successful reply to our qEcho packet, so lets say
|
||
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// everything is fine...
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||
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return PacketResult::Success;
|
||
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}
|
||
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} else {
|
||
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disconnected = true;
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||
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Disconnect();
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||
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}
|
||
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}
|
||
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timed_out = true;
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||
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break;
|
||
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case eConnectionStatusSuccess:
|
||
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// printf ("status = success but error = %s\n",
|
||
|
// error.AsCString("<invalid>"));
|
||
|
break;
|
||
|
|
||
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case eConnectionStatusEndOfFile:
|
||
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case eConnectionStatusNoConnection:
|
||
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case eConnectionStatusLostConnection:
|
||
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case eConnectionStatusError:
|
||
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disconnected = true;
|
||
|
Disconnect();
|
||
|
break;
|
||
|
}
|
||
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}
|
||
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}
|
||
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packet.Clear();
|
||
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if (disconnected)
|
||
|
return PacketResult::ErrorDisconnected;
|
||
|
if (timed_out)
|
||
|
return PacketResult::ErrorReplyTimeout;
|
||
|
else
|
||
|
return PacketResult::ErrorReplyFailed;
|
||
|
}
|
||
|
|
||
|
bool GDBRemoteCommunication::DecompressPacket() {
|
||
|
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
|
||
|
|
||
|
if (!CompressionIsEnabled())
|
||
|
return true;
|
||
|
|
||
|
size_t pkt_size = m_bytes.size();
|
||
|
|
||
|
// Smallest possible compressed packet is $N#00 - an uncompressed empty
|
||
|
// reply, most commonly indicating an unsupported packet. Anything less than
|
||
|
// 5 characters, it's definitely not a compressed packet.
|
||
|
if (pkt_size < 5)
|
||
|
return true;
|
||
|
|
||
|
if (m_bytes[0] != '$' && m_bytes[0] != '%')
|
||
|
return true;
|
||
|
if (m_bytes[1] != 'C' && m_bytes[1] != 'N')
|
||
|
return true;
|
||
|
|
||
|
size_t hash_mark_idx = m_bytes.find('#');
|
||
|
if (hash_mark_idx == std::string::npos)
|
||
|
return true;
|
||
|
if (hash_mark_idx + 2 >= m_bytes.size())
|
||
|
return true;
|
||
|
|
||
|
if (!::isxdigit(m_bytes[hash_mark_idx + 1]) ||
|
||
|
!::isxdigit(m_bytes[hash_mark_idx + 2]))
|
||
|
return true;
|
||
|
|
||
|
size_t content_length =
|
||
|
pkt_size -
|
||
|
5; // not counting '$', 'C' | 'N', '#', & the two hex checksum chars
|
||
|
size_t content_start = 2; // The first character of the
|
||
|
// compressed/not-compressed text of the packet
|
||
|
size_t checksum_idx =
|
||
|
hash_mark_idx +
|
||
|
1; // The first character of the two hex checksum characters
|
||
|
|
||
|
// Normally size_of_first_packet == m_bytes.size() but m_bytes may contain
|
||
|
// multiple packets. size_of_first_packet is the size of the initial packet
|
||
|
// which we'll replace with the decompressed version of, leaving the rest of
|
||
|
// m_bytes unmodified.
|
||
|
size_t size_of_first_packet = hash_mark_idx + 3;
|
||
|
|
||
|
// Compressed packets ("$C") start with a base10 number which is the size of
|
||
|
// the uncompressed payload, then a : and then the compressed data. e.g.
|
||
|
// $C1024:<binary>#00 Update content_start and content_length to only include
|
||
|
// the <binary> part of the packet.
|
||
|
|
||
|
uint64_t decompressed_bufsize = ULONG_MAX;
|
||
|
if (m_bytes[1] == 'C') {
|
||
|
size_t i = content_start;
|
||
|
while (i < hash_mark_idx && isdigit(m_bytes[i]))
|
||
|
i++;
|
||
|
if (i < hash_mark_idx && m_bytes[i] == ':') {
|
||
|
i++;
|
||
|
content_start = i;
|
||
|
content_length = hash_mark_idx - content_start;
|
||
|
std::string bufsize_str(m_bytes.data() + 2, i - 2 - 1);
|
||
|
errno = 0;
|
||
|
decompressed_bufsize = ::strtoul(bufsize_str.c_str(), nullptr, 10);
|
||
|
if (errno != 0 || decompressed_bufsize == ULONG_MAX) {
|
||
|
m_bytes.erase(0, size_of_first_packet);
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (GetSendAcks()) {
|
||
|
char packet_checksum_cstr[3];
|
||
|
packet_checksum_cstr[0] = m_bytes[checksum_idx];
|
||
|
packet_checksum_cstr[1] = m_bytes[checksum_idx + 1];
|
||
|
packet_checksum_cstr[2] = '\0';
|
||
|
long packet_checksum = strtol(packet_checksum_cstr, nullptr, 16);
|
||
|
|
||
|
long actual_checksum = CalculcateChecksum(
|
||
|
llvm::StringRef(m_bytes).substr(1, hash_mark_idx - 1));
|
||
|
bool success = packet_checksum == actual_checksum;
|
||
|
if (!success) {
|
||
|
LLDB_LOGF(log,
|
||
|
"error: checksum mismatch: %.*s expected 0x%2.2x, got 0x%2.2x",
|
||
|
(int)(pkt_size), m_bytes.c_str(), (uint8_t)packet_checksum,
|
||
|
(uint8_t)actual_checksum);
|
||
|
}
|
||
|
// Send the ack or nack if needed
|
||
|
if (!success) {
|
||
|
SendNack();
|
||
|
m_bytes.erase(0, size_of_first_packet);
|
||
|
return false;
|
||
|
} else {
|
||
|
SendAck();
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (m_bytes[1] == 'N') {
|
||
|
// This packet was not compressed -- delete the 'N' character at the start
|
||
|
// and the packet may be processed as-is.
|
||
|
m_bytes.erase(1, 1);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
// Reverse the gdb-remote binary escaping that was done to the compressed
|
||
|
// text to guard characters like '$', '#', '}', etc.
|
||
|
std::vector<uint8_t> unescaped_content;
|
||
|
unescaped_content.reserve(content_length);
|
||
|
size_t i = content_start;
|
||
|
while (i < hash_mark_idx) {
|
||
|
if (m_bytes[i] == '}') {
|
||
|
i++;
|
||
|
unescaped_content.push_back(m_bytes[i] ^ 0x20);
|
||
|
} else {
|
||
|
unescaped_content.push_back(m_bytes[i]);
|
||
|
}
|
||
|
i++;
|
||
|
}
|
||
|
|
||
|
uint8_t *decompressed_buffer = nullptr;
|
||
|
size_t decompressed_bytes = 0;
|
||
|
|
||
|
if (decompressed_bufsize != ULONG_MAX) {
|
||
|
decompressed_buffer = (uint8_t *)malloc(decompressed_bufsize);
|
||
|
if (decompressed_buffer == nullptr) {
|
||
|
m_bytes.erase(0, size_of_first_packet);
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
#if defined(HAVE_LIBCOMPRESSION)
|
||
|
if (m_compression_type == CompressionType::ZlibDeflate ||
|
||
|
m_compression_type == CompressionType::LZFSE ||
|
||
|
m_compression_type == CompressionType::LZ4 ||
|
||
|
m_compression_type == CompressionType::LZMA) {
|
||
|
compression_algorithm compression_type;
|
||
|
if (m_compression_type == CompressionType::LZFSE)
|
||
|
compression_type = COMPRESSION_LZFSE;
|
||
|
else if (m_compression_type == CompressionType::ZlibDeflate)
|
||
|
compression_type = COMPRESSION_ZLIB;
|
||
|
else if (m_compression_type == CompressionType::LZ4)
|
||
|
compression_type = COMPRESSION_LZ4_RAW;
|
||
|
else if (m_compression_type == CompressionType::LZMA)
|
||
|
compression_type = COMPRESSION_LZMA;
|
||
|
|
||
|
if (m_decompression_scratch_type != m_compression_type) {
|
||
|
if (m_decompression_scratch) {
|
||
|
free (m_decompression_scratch);
|
||
|
m_decompression_scratch = nullptr;
|
||
|
}
|
||
|
size_t scratchbuf_size = 0;
|
||
|
if (m_compression_type == CompressionType::LZFSE)
|
||
|
scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZFSE);
|
||
|
else if (m_compression_type == CompressionType::LZ4)
|
||
|
scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZ4_RAW);
|
||
|
else if (m_compression_type == CompressionType::ZlibDeflate)
|
||
|
scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_ZLIB);
|
||
|
else if (m_compression_type == CompressionType::LZMA)
|
||
|
scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZMA);
|
||
|
else if (m_compression_type == CompressionType::LZFSE)
|
||
|
scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZFSE);
|
||
|
if (scratchbuf_size > 0) {
|
||
|
m_decompression_scratch = (void*) malloc (scratchbuf_size);
|
||
|
m_decompression_scratch_type = m_compression_type;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (decompressed_bufsize != ULONG_MAX && decompressed_buffer != nullptr) {
|
||
|
decompressed_bytes = compression_decode_buffer(
|
||
|
decompressed_buffer, decompressed_bufsize,
|
||
|
(uint8_t *)unescaped_content.data(), unescaped_content.size(),
|
||
|
m_decompression_scratch, compression_type);
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#if LLVM_ENABLE_ZLIB
|
||
|
if (decompressed_bytes == 0 && decompressed_bufsize != ULONG_MAX &&
|
||
|
decompressed_buffer != nullptr &&
|
||
|
m_compression_type == CompressionType::ZlibDeflate) {
|
||
|
z_stream stream;
|
||
|
memset(&stream, 0, sizeof(z_stream));
|
||
|
stream.next_in = (Bytef *)unescaped_content.data();
|
||
|
stream.avail_in = (uInt)unescaped_content.size();
|
||
|
stream.total_in = 0;
|
||
|
stream.next_out = (Bytef *)decompressed_buffer;
|
||
|
stream.avail_out = decompressed_bufsize;
|
||
|
stream.total_out = 0;
|
||
|
stream.zalloc = Z_NULL;
|
||
|
stream.zfree = Z_NULL;
|
||
|
stream.opaque = Z_NULL;
|
||
|
|
||
|
if (inflateInit2(&stream, -15) == Z_OK) {
|
||
|
int status = inflate(&stream, Z_NO_FLUSH);
|
||
|
inflateEnd(&stream);
|
||
|
if (status == Z_STREAM_END) {
|
||
|
decompressed_bytes = stream.total_out;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
if (decompressed_bytes == 0 || decompressed_buffer == nullptr) {
|
||
|
if (decompressed_buffer)
|
||
|
free(decompressed_buffer);
|
||
|
m_bytes.erase(0, size_of_first_packet);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
std::string new_packet;
|
||
|
new_packet.reserve(decompressed_bytes + 6);
|
||
|
new_packet.push_back(m_bytes[0]);
|
||
|
new_packet.append((const char *)decompressed_buffer, decompressed_bytes);
|
||
|
new_packet.push_back('#');
|
||
|
if (GetSendAcks()) {
|
||
|
uint8_t decompressed_checksum = CalculcateChecksum(
|
||
|
llvm::StringRef((const char *)decompressed_buffer, decompressed_bytes));
|
||
|
char decompressed_checksum_str[3];
|
||
|
snprintf(decompressed_checksum_str, 3, "%02x", decompressed_checksum);
|
||
|
new_packet.append(decompressed_checksum_str);
|
||
|
} else {
|
||
|
new_packet.push_back('0');
|
||
|
new_packet.push_back('0');
|
||
|
}
|
||
|
|
||
|
m_bytes.replace(0, size_of_first_packet, new_packet.data(),
|
||
|
new_packet.size());
|
||
|
|
||
|
free(decompressed_buffer);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
GDBRemoteCommunication::PacketType
|
||
|
GDBRemoteCommunication::CheckForPacket(const uint8_t *src, size_t src_len,
|
||
|
StringExtractorGDBRemote &packet) {
|
||
|
// Put the packet data into the buffer in a thread safe fashion
|
||
|
std::lock_guard<std::recursive_mutex> guard(m_bytes_mutex);
|
||
|
|
||
|
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS));
|
||
|
|
||
|
if (src && src_len > 0) {
|
||
|
if (log && log->GetVerbose()) {
|
||
|
StreamString s;
|
||
|
LLDB_LOGF(log, "GDBRemoteCommunication::%s adding %u bytes: %.*s",
|
||
|
__FUNCTION__, (uint32_t)src_len, (uint32_t)src_len, src);
|
||
|
}
|
||
|
m_bytes.append((const char *)src, src_len);
|
||
|
}
|
||
|
|
||
|
bool isNotifyPacket = false;
|
||
|
|
||
|
// Parse up the packets into gdb remote packets
|
||
|
if (!m_bytes.empty()) {
|
||
|
// end_idx must be one past the last valid packet byte. Start it off with
|
||
|
// an invalid value that is the same as the current index.
|
||
|
size_t content_start = 0;
|
||
|
size_t content_length = 0;
|
||
|
size_t total_length = 0;
|
||
|
size_t checksum_idx = std::string::npos;
|
||
|
|
||
|
// Size of packet before it is decompressed, for logging purposes
|
||
|
size_t original_packet_size = m_bytes.size();
|
||
|
if (CompressionIsEnabled()) {
|
||
|
if (!DecompressPacket()) {
|
||
|
packet.Clear();
|
||
|
return GDBRemoteCommunication::PacketType::Standard;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
switch (m_bytes[0]) {
|
||
|
case '+': // Look for ack
|
||
|
case '-': // Look for cancel
|
||
|
case '\x03': // ^C to halt target
|
||
|
content_length = total_length = 1; // The command is one byte long...
|
||
|
break;
|
||
|
|
||
|
case '%': // Async notify packet
|
||
|
isNotifyPacket = true;
|
||
|
LLVM_FALLTHROUGH;
|
||
|
|
||
|
case '$':
|
||
|
// Look for a standard gdb packet?
|
||
|
{
|
||
|
size_t hash_pos = m_bytes.find('#');
|
||
|
if (hash_pos != std::string::npos) {
|
||
|
if (hash_pos + 2 < m_bytes.size()) {
|
||
|
checksum_idx = hash_pos + 1;
|
||
|
// Skip the dollar sign
|
||
|
content_start = 1;
|
||
|
// Don't include the # in the content or the $ in the content
|
||
|
// length
|
||
|
content_length = hash_pos - 1;
|
||
|
|
||
|
total_length =
|
||
|
hash_pos + 3; // Skip the # and the two hex checksum bytes
|
||
|
} else {
|
||
|
// Checksum bytes aren't all here yet
|
||
|
content_length = std::string::npos;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
default: {
|
||
|
// We have an unexpected byte and we need to flush all bad data that is
|
||
|
// in m_bytes, so we need to find the first byte that is a '+' (ACK), '-'
|
||
|
// (NACK), \x03 (CTRL+C interrupt), or '$' character (start of packet
|
||
|
// header) or of course, the end of the data in m_bytes...
|
||
|
const size_t bytes_len = m_bytes.size();
|
||
|
bool done = false;
|
||
|
uint32_t idx;
|
||
|
for (idx = 1; !done && idx < bytes_len; ++idx) {
|
||
|
switch (m_bytes[idx]) {
|
||
|
case '+':
|
||
|
case '-':
|
||
|
case '\x03':
|
||
|
case '%':
|
||
|
case '$':
|
||
|
done = true;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
LLDB_LOGF(log, "GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'",
|
||
|
__FUNCTION__, idx - 1, idx - 1, m_bytes.c_str());
|
||
|
m_bytes.erase(0, idx - 1);
|
||
|
} break;
|
||
|
}
|
||
|
|
||
|
if (content_length == std::string::npos) {
|
||
|
packet.Clear();
|
||
|
return GDBRemoteCommunication::PacketType::Invalid;
|
||
|
} else if (total_length > 0) {
|
||
|
|
||
|
// We have a valid packet...
|
||
|
assert(content_length <= m_bytes.size());
|
||
|
assert(total_length <= m_bytes.size());
|
||
|
assert(content_length <= total_length);
|
||
|
size_t content_end = content_start + content_length;
|
||
|
|
||
|
bool success = true;
|
||
|
if (log) {
|
||
|
// If logging was just enabled and we have history, then dump out what
|
||
|
// we have to the log so we get the historical context. The Dump() call
|
||
|
// that logs all of the packet will set a boolean so that we don't dump
|
||
|
// this more than once
|
||
|
if (!m_history.DidDumpToLog())
|
||
|
m_history.Dump(log);
|
||
|
|
||
|
bool binary = false;
|
||
|
// Only detect binary for packets that start with a '$' and have a
|
||
|
// '#CC' checksum
|
||
|
if (m_bytes[0] == '$' && total_length > 4) {
|
||
|
for (size_t i = 0; !binary && i < total_length; ++i) {
|
||
|
unsigned char c = m_bytes[i];
|
||
|
if (!llvm::isPrint(c) && !llvm::isSpace(c)) {
|
||
|
binary = true;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if (binary) {
|
||
|
StreamString strm;
|
||
|
// Packet header...
|
||
|
if (CompressionIsEnabled())
|
||
|
strm.Printf("<%4" PRIu64 ":%" PRIu64 "> read packet: %c",
|
||
|
(uint64_t)original_packet_size, (uint64_t)total_length,
|
||
|
m_bytes[0]);
|
||
|
else
|
||
|
strm.Printf("<%4" PRIu64 "> read packet: %c",
|
||
|
(uint64_t)total_length, m_bytes[0]);
|
||
|
for (size_t i = content_start; i < content_end; ++i) {
|
||
|
// Remove binary escaped bytes when displaying the packet...
|
||
|
const char ch = m_bytes[i];
|
||
|
if (ch == 0x7d) {
|
||
|
// 0x7d is the escape character. The next character is to be
|
||
|
// XOR'd with 0x20.
|
||
|
const char escapee = m_bytes[++i] ^ 0x20;
|
||
|
strm.Printf("%2.2x", escapee);
|
||
|
} else {
|
||
|
strm.Printf("%2.2x", (uint8_t)ch);
|
||
|
}
|
||
|
}
|
||
|
// Packet footer...
|
||
|
strm.Printf("%c%c%c", m_bytes[total_length - 3],
|
||
|
m_bytes[total_length - 2], m_bytes[total_length - 1]);
|
||
|
log->PutString(strm.GetString());
|
||
|
} else {
|
||
|
if (CompressionIsEnabled())
|
||
|
LLDB_LOGF(log, "<%4" PRIu64 ":%" PRIu64 "> read packet: %.*s",
|
||
|
(uint64_t)original_packet_size, (uint64_t)total_length,
|
||
|
(int)(total_length), m_bytes.c_str());
|
||
|
else
|
||
|
LLDB_LOGF(log, "<%4" PRIu64 "> read packet: %.*s",
|
||
|
(uint64_t)total_length, (int)(total_length),
|
||
|
m_bytes.c_str());
|
||
|
}
|
||
|
}
|
||
|
|
||
|
m_history.AddPacket(m_bytes, total_length,
|
||
|
GDBRemotePacket::ePacketTypeRecv, total_length);
|
||
|
|
||
|
// Copy the packet from m_bytes to packet_str expanding the run-length
|
||
|
// encoding in the process.
|
||
|
std ::string packet_str =
|
||
|
ExpandRLE(m_bytes.substr(content_start, content_end - content_start));
|
||
|
packet = StringExtractorGDBRemote(packet_str);
|
||
|
|
||
|
if (m_bytes[0] == '$' || m_bytes[0] == '%') {
|
||
|
assert(checksum_idx < m_bytes.size());
|
||
|
if (::isxdigit(m_bytes[checksum_idx + 0]) ||
|
||
|
::isxdigit(m_bytes[checksum_idx + 1])) {
|
||
|
if (GetSendAcks()) {
|
||
|
const char *packet_checksum_cstr = &m_bytes[checksum_idx];
|
||
|
char packet_checksum = strtol(packet_checksum_cstr, nullptr, 16);
|
||
|
char actual_checksum = CalculcateChecksum(
|
||
|
llvm::StringRef(m_bytes).slice(content_start, content_end));
|
||
|
success = packet_checksum == actual_checksum;
|
||
|
if (!success) {
|
||
|
LLDB_LOGF(log,
|
||
|
"error: checksum mismatch: %.*s expected 0x%2.2x, "
|
||
|
"got 0x%2.2x",
|
||
|
(int)(total_length), m_bytes.c_str(),
|
||
|
(uint8_t)packet_checksum, (uint8_t)actual_checksum);
|
||
|
}
|
||
|
// Send the ack or nack if needed
|
||
|
if (!success)
|
||
|
SendNack();
|
||
|
else
|
||
|
SendAck();
|
||
|
}
|
||
|
} else {
|
||
|
success = false;
|
||
|
LLDB_LOGF(log, "error: invalid checksum in packet: '%s'\n",
|
||
|
m_bytes.c_str());
|
||
|
}
|
||
|
}
|
||
|
|
||
|
m_bytes.erase(0, total_length);
|
||
|
packet.SetFilePos(0);
|
||
|
|
||
|
if (isNotifyPacket)
|
||
|
return GDBRemoteCommunication::PacketType::Notify;
|
||
|
else
|
||
|
return GDBRemoteCommunication::PacketType::Standard;
|
||
|
}
|
||
|
}
|
||
|
packet.Clear();
|
||
|
return GDBRemoteCommunication::PacketType::Invalid;
|
||
|
}
|
||
|
|
||
|
Status GDBRemoteCommunication::StartListenThread(const char *hostname,
|
||
|
uint16_t port) {
|
||
|
if (m_listen_thread.IsJoinable())
|
||
|
return Status("listen thread already running");
|
||
|
|
||
|
char listen_url[512];
|
||
|
if (hostname && hostname[0])
|
||
|
snprintf(listen_url, sizeof(listen_url), "listen://%s:%i", hostname, port);
|
||
|
else
|
||
|
snprintf(listen_url, sizeof(listen_url), "listen://%i", port);
|
||
|
m_listen_url = listen_url;
|
||
|
SetConnection(std::make_unique<ConnectionFileDescriptor>());
|
||
|
llvm::Expected<HostThread> listen_thread = ThreadLauncher::LaunchThread(
|
||
|
listen_url, GDBRemoteCommunication::ListenThread, this);
|
||
|
if (!listen_thread)
|
||
|
return Status(listen_thread.takeError());
|
||
|
m_listen_thread = *listen_thread;
|
||
|
|
||
|
return Status();
|
||
|
}
|
||
|
|
||
|
bool GDBRemoteCommunication::JoinListenThread() {
|
||
|
if (m_listen_thread.IsJoinable())
|
||
|
m_listen_thread.Join(nullptr);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
lldb::thread_result_t
|
||
|
GDBRemoteCommunication::ListenThread(lldb::thread_arg_t arg) {
|
||
|
GDBRemoteCommunication *comm = (GDBRemoteCommunication *)arg;
|
||
|
Status error;
|
||
|
ConnectionFileDescriptor *connection =
|
||
|
(ConnectionFileDescriptor *)comm->GetConnection();
|
||
|
|
||
|
if (connection) {
|
||
|
// Do the listen on another thread so we can continue on...
|
||
|
if (connection->Connect(comm->m_listen_url.c_str(), &error) !=
|
||
|
eConnectionStatusSuccess)
|
||
|
comm->SetConnection(nullptr);
|
||
|
}
|
||
|
return {};
|
||
|
}
|
||
|
|
||
|
Status GDBRemoteCommunication::StartDebugserverProcess(
|
||
|
const char *url, Platform *platform, ProcessLaunchInfo &launch_info,
|
||
|
uint16_t *port, const Args *inferior_args, int pass_comm_fd) {
|
||
|
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
|
||
|
LLDB_LOGF(log, "GDBRemoteCommunication::%s(url=%s, port=%" PRIu16 ")",
|
||
|
__FUNCTION__, url ? url : "<empty>", port ? *port : uint16_t(0));
|
||
|
|
||
|
Status error;
|
||
|
// If we locate debugserver, keep that located version around
|
||
|
static FileSpec g_debugserver_file_spec;
|
||
|
|
||
|
char debugserver_path[PATH_MAX];
|
||
|
FileSpec &debugserver_file_spec = launch_info.GetExecutableFile();
|
||
|
|
||
|
Environment host_env = Host::GetEnvironment();
|
||
|
|
||
|
// Always check to see if we have an environment override for the path to the
|
||
|
// debugserver to use and use it if we do.
|
||
|
std::string env_debugserver_path = host_env.lookup("LLDB_DEBUGSERVER_PATH");
|
||
|
if (!env_debugserver_path.empty()) {
|
||
|
debugserver_file_spec.SetFile(env_debugserver_path,
|
||
|
FileSpec::Style::native);
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() gdb-remote stub exe path set "
|
||
|
"from environment variable: %s",
|
||
|
__FUNCTION__, env_debugserver_path.c_str());
|
||
|
} else
|
||
|
debugserver_file_spec = g_debugserver_file_spec;
|
||
|
bool debugserver_exists =
|
||
|
FileSystem::Instance().Exists(debugserver_file_spec);
|
||
|
if (!debugserver_exists) {
|
||
|
// The debugserver binary is in the LLDB.framework/Resources directory.
|
||
|
debugserver_file_spec = HostInfo::GetSupportExeDir();
|
||
|
if (debugserver_file_spec) {
|
||
|
debugserver_file_spec.AppendPathComponent(DEBUGSERVER_BASENAME);
|
||
|
debugserver_exists = FileSystem::Instance().Exists(debugserver_file_spec);
|
||
|
if (debugserver_exists) {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() found gdb-remote stub exe '%s'",
|
||
|
__FUNCTION__, debugserver_file_spec.GetPath().c_str());
|
||
|
|
||
|
g_debugserver_file_spec = debugserver_file_spec;
|
||
|
} else {
|
||
|
if (platform)
|
||
|
debugserver_file_spec =
|
||
|
platform->LocateExecutable(DEBUGSERVER_BASENAME);
|
||
|
else
|
||
|
debugserver_file_spec.Clear();
|
||
|
if (debugserver_file_spec) {
|
||
|
// Platform::LocateExecutable() wouldn't return a path if it doesn't
|
||
|
// exist
|
||
|
debugserver_exists = true;
|
||
|
} else {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() could not find "
|
||
|
"gdb-remote stub exe '%s'",
|
||
|
__FUNCTION__, debugserver_file_spec.GetPath().c_str());
|
||
|
}
|
||
|
// Don't cache the platform specific GDB server binary as it could
|
||
|
// change from platform to platform
|
||
|
g_debugserver_file_spec.Clear();
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (debugserver_exists) {
|
||
|
debugserver_file_spec.GetPath(debugserver_path, sizeof(debugserver_path));
|
||
|
|
||
|
Args &debugserver_args = launch_info.GetArguments();
|
||
|
debugserver_args.Clear();
|
||
|
|
||
|
// Start args with "debugserver /file/path -r --"
|
||
|
debugserver_args.AppendArgument(llvm::StringRef(debugserver_path));
|
||
|
|
||
|
#if !defined(__APPLE__)
|
||
|
// First argument to lldb-server must be mode in which to run.
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("gdbserver"));
|
||
|
#endif
|
||
|
|
||
|
// If a url is supplied then use it
|
||
|
if (url)
|
||
|
debugserver_args.AppendArgument(llvm::StringRef(url));
|
||
|
|
||
|
if (pass_comm_fd >= 0) {
|
||
|
StreamString fd_arg;
|
||
|
fd_arg.Printf("--fd=%i", pass_comm_fd);
|
||
|
debugserver_args.AppendArgument(fd_arg.GetString());
|
||
|
// Send "pass_comm_fd" down to the inferior so it can use it to
|
||
|
// communicate back with this process
|
||
|
launch_info.AppendDuplicateFileAction(pass_comm_fd, pass_comm_fd);
|
||
|
}
|
||
|
|
||
|
// use native registers, not the GDB registers
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--native-regs"));
|
||
|
|
||
|
if (launch_info.GetLaunchInSeparateProcessGroup()) {
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--setsid"));
|
||
|
}
|
||
|
|
||
|
llvm::SmallString<128> named_pipe_path;
|
||
|
// socket_pipe is used by debug server to communicate back either
|
||
|
// TCP port or domain socket name which it listens on.
|
||
|
// The second purpose of the pipe to serve as a synchronization point -
|
||
|
// once data is written to the pipe, debug server is up and running.
|
||
|
Pipe socket_pipe;
|
||
|
|
||
|
// port is null when debug server should listen on domain socket - we're
|
||
|
// not interested in port value but rather waiting for debug server to
|
||
|
// become available.
|
||
|
if (pass_comm_fd == -1) {
|
||
|
if (url) {
|
||
|
// Create a temporary file to get the stdout/stderr and redirect the output of
|
||
|
// the command into this file. We will later read this file if all goes well
|
||
|
// and fill the data into "command_output_ptr"
|
||
|
#if defined(__APPLE__)
|
||
|
// Binding to port zero, we need to figure out what port it ends up
|
||
|
// using using a named pipe...
|
||
|
error = socket_pipe.CreateWithUniqueName("debugserver-named-pipe",
|
||
|
false, named_pipe_path);
|
||
|
if (error.Fail()) {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"named pipe creation failed: %s",
|
||
|
__FUNCTION__, error.AsCString());
|
||
|
return error;
|
||
|
}
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--named-pipe"));
|
||
|
debugserver_args.AppendArgument(named_pipe_path);
|
||
|
#else
|
||
|
// Binding to port zero, we need to figure out what port it ends up
|
||
|
// using using an unnamed pipe...
|
||
|
error = socket_pipe.CreateNew(true);
|
||
|
if (error.Fail()) {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"unnamed pipe creation failed: %s",
|
||
|
__FUNCTION__, error.AsCString());
|
||
|
return error;
|
||
|
}
|
||
|
pipe_t write = socket_pipe.GetWritePipe();
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--pipe"));
|
||
|
debugserver_args.AppendArgument(llvm::to_string(write));
|
||
|
launch_info.AppendCloseFileAction(socket_pipe.GetReadFileDescriptor());
|
||
|
#endif
|
||
|
} else {
|
||
|
// No host and port given, so lets listen on our end and make the
|
||
|
// debugserver connect to us..
|
||
|
error = StartListenThread("127.0.0.1", 0);
|
||
|
if (error.Fail()) {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() unable to start listen "
|
||
|
"thread: %s",
|
||
|
__FUNCTION__, error.AsCString());
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
ConnectionFileDescriptor *connection =
|
||
|
(ConnectionFileDescriptor *)GetConnection();
|
||
|
// Wait for 10 seconds to resolve the bound port
|
||
|
uint16_t port_ = connection->GetListeningPort(std::chrono::seconds(10));
|
||
|
if (port_ > 0) {
|
||
|
char port_cstr[32];
|
||
|
snprintf(port_cstr, sizeof(port_cstr), "127.0.0.1:%i", port_);
|
||
|
// Send the host and port down that debugserver and specify an option
|
||
|
// so that it connects back to the port we are listening to in this
|
||
|
// process
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--reverse-connect"));
|
||
|
debugserver_args.AppendArgument(llvm::StringRef(port_cstr));
|
||
|
if (port)
|
||
|
*port = port_;
|
||
|
} else {
|
||
|
error.SetErrorString("failed to bind to port 0 on 127.0.0.1");
|
||
|
LLDB_LOGF(log, "GDBRemoteCommunication::%s() failed: %s",
|
||
|
__FUNCTION__, error.AsCString());
|
||
|
return error;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
std::string env_debugserver_log_file =
|
||
|
host_env.lookup("LLDB_DEBUGSERVER_LOG_FILE");
|
||
|
if (!env_debugserver_log_file.empty()) {
|
||
|
debugserver_args.AppendArgument(
|
||
|
llvm::formatv("--log-file={0}", env_debugserver_log_file).str());
|
||
|
}
|
||
|
|
||
|
#if defined(__APPLE__)
|
||
|
const char *env_debugserver_log_flags =
|
||
|
getenv("LLDB_DEBUGSERVER_LOG_FLAGS");
|
||
|
if (env_debugserver_log_flags) {
|
||
|
debugserver_args.AppendArgument(
|
||
|
llvm::formatv("--log-flags={0}", env_debugserver_log_flags).str());
|
||
|
}
|
||
|
#else
|
||
|
std::string env_debugserver_log_channels =
|
||
|
host_env.lookup("LLDB_SERVER_LOG_CHANNELS");
|
||
|
if (!env_debugserver_log_channels.empty()) {
|
||
|
debugserver_args.AppendArgument(
|
||
|
llvm::formatv("--log-channels={0}", env_debugserver_log_channels)
|
||
|
.str());
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
// Add additional args, starting with LLDB_DEBUGSERVER_EXTRA_ARG_1 until an
|
||
|
// env var doesn't come back.
|
||
|
uint32_t env_var_index = 1;
|
||
|
bool has_env_var;
|
||
|
do {
|
||
|
char env_var_name[64];
|
||
|
snprintf(env_var_name, sizeof(env_var_name),
|
||
|
"LLDB_DEBUGSERVER_EXTRA_ARG_%" PRIu32, env_var_index++);
|
||
|
std::string extra_arg = host_env.lookup(env_var_name);
|
||
|
has_env_var = !extra_arg.empty();
|
||
|
|
||
|
if (has_env_var) {
|
||
|
debugserver_args.AppendArgument(llvm::StringRef(extra_arg));
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s adding env var %s contents "
|
||
|
"to stub command line (%s)",
|
||
|
__FUNCTION__, env_var_name, extra_arg.c_str());
|
||
|
}
|
||
|
} while (has_env_var);
|
||
|
|
||
|
if (inferior_args && inferior_args->GetArgumentCount() > 0) {
|
||
|
debugserver_args.AppendArgument(llvm::StringRef("--"));
|
||
|
debugserver_args.AppendArguments(*inferior_args);
|
||
|
}
|
||
|
|
||
|
// Copy the current environment to the gdbserver/debugserver instance
|
||
|
launch_info.GetEnvironment() = host_env;
|
||
|
|
||
|
// Close STDIN, STDOUT and STDERR.
|
||
|
launch_info.AppendCloseFileAction(STDIN_FILENO);
|
||
|
launch_info.AppendCloseFileAction(STDOUT_FILENO);
|
||
|
launch_info.AppendCloseFileAction(STDERR_FILENO);
|
||
|
|
||
|
// Redirect STDIN, STDOUT and STDERR to "/dev/null".
|
||
|
launch_info.AppendSuppressFileAction(STDIN_FILENO, true, false);
|
||
|
launch_info.AppendSuppressFileAction(STDOUT_FILENO, false, true);
|
||
|
launch_info.AppendSuppressFileAction(STDERR_FILENO, false, true);
|
||
|
|
||
|
if (log) {
|
||
|
StreamString string_stream;
|
||
|
Platform *const platform = nullptr;
|
||
|
launch_info.Dump(string_stream, platform);
|
||
|
LLDB_LOGF(log, "launch info for gdb-remote stub:\n%s",
|
||
|
string_stream.GetData());
|
||
|
}
|
||
|
error = Host::LaunchProcess(launch_info);
|
||
|
|
||
|
if (error.Success() &&
|
||
|
(launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) &&
|
||
|
pass_comm_fd == -1) {
|
||
|
if (named_pipe_path.size() > 0) {
|
||
|
error = socket_pipe.OpenAsReader(named_pipe_path, false);
|
||
|
if (error.Fail())
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"failed to open named pipe %s for reading: %s",
|
||
|
__FUNCTION__, named_pipe_path.c_str(), error.AsCString());
|
||
|
}
|
||
|
|
||
|
if (socket_pipe.CanWrite())
|
||
|
socket_pipe.CloseWriteFileDescriptor();
|
||
|
if (socket_pipe.CanRead()) {
|
||
|
char port_cstr[PATH_MAX] = {0};
|
||
|
port_cstr[0] = '\0';
|
||
|
size_t num_bytes = sizeof(port_cstr);
|
||
|
// Read port from pipe with 10 second timeout.
|
||
|
error = socket_pipe.ReadWithTimeout(
|
||
|
port_cstr, num_bytes, std::chrono::seconds{10}, num_bytes);
|
||
|
if (error.Success() && (port != nullptr)) {
|
||
|
assert(num_bytes > 0 && port_cstr[num_bytes - 1] == '\0');
|
||
|
uint16_t child_port = StringConvert::ToUInt32(port_cstr, 0);
|
||
|
if (*port == 0 || *port == child_port) {
|
||
|
*port = child_port;
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"debugserver listens %u port",
|
||
|
__FUNCTION__, *port);
|
||
|
} else {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"debugserver listening on port "
|
||
|
"%d but requested port was %d",
|
||
|
__FUNCTION__, (uint32_t)child_port, (uint32_t)(*port));
|
||
|
}
|
||
|
} else {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s() "
|
||
|
"failed to read a port value from pipe %s: %s",
|
||
|
__FUNCTION__, named_pipe_path.c_str(), error.AsCString());
|
||
|
}
|
||
|
socket_pipe.Close();
|
||
|
}
|
||
|
|
||
|
if (named_pipe_path.size() > 0) {
|
||
|
const auto err = socket_pipe.Delete(named_pipe_path);
|
||
|
if (err.Fail()) {
|
||
|
LLDB_LOGF(log,
|
||
|
"GDBRemoteCommunication::%s failed to delete pipe %s: %s",
|
||
|
__FUNCTION__, named_pipe_path.c_str(), err.AsCString());
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Make sure we actually connect with the debugserver...
|
||
|
JoinListenThread();
|
||
|
}
|
||
|
} else {
|
||
|
error.SetErrorStringWithFormat("unable to locate " DEBUGSERVER_BASENAME);
|
||
|
}
|
||
|
|
||
|
if (error.Fail()) {
|
||
|
LLDB_LOGF(log, "GDBRemoteCommunication::%s() failed: %s", __FUNCTION__,
|
||
|
error.AsCString());
|
||
|
}
|
||
|
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
void GDBRemoteCommunication::DumpHistory(Stream &strm) { m_history.Dump(strm); }
|
||
|
|
||
|
void GDBRemoteCommunication::SetPacketRecorder(
|
||
|
repro::PacketRecorder *recorder) {
|
||
|
m_history.SetRecorder(recorder);
|
||
|
}
|
||
|
|
||
|
llvm::Error
|
||
|
GDBRemoteCommunication::ConnectLocally(GDBRemoteCommunication &client,
|
||
|
GDBRemoteCommunication &server) {
|
||
|
const bool child_processes_inherit = false;
|
||
|
const int backlog = 5;
|
||
|
TCPSocket listen_socket(true, child_processes_inherit);
|
||
|
if (llvm::Error error =
|
||
|
listen_socket.Listen("localhost:0", backlog).ToError())
|
||
|
return error;
|
||
|
|
||
|
Socket *accept_socket;
|
||
|
std::future<Status> accept_status = std::async(
|
||
|
std::launch::async, [&] { return listen_socket.Accept(accept_socket); });
|
||
|
|
||
|
llvm::SmallString<32> remote_addr;
|
||
|
llvm::raw_svector_ostream(remote_addr)
|
||
|
<< "connect://localhost:" << listen_socket.GetLocalPortNumber();
|
||
|
|
||
|
std::unique_ptr<ConnectionFileDescriptor> conn_up(
|
||
|
new ConnectionFileDescriptor());
|
||
|
Status status;
|
||
|
if (conn_up->Connect(remote_addr, &status) != lldb::eConnectionStatusSuccess)
|
||
|
return llvm::createStringError(llvm::inconvertibleErrorCode(),
|
||
|
"Unable to connect: %s", status.AsCString());
|
||
|
|
||
|
client.SetConnection(std::move(conn_up));
|
||
|
if (llvm::Error error = accept_status.get().ToError())
|
||
|
return error;
|
||
|
|
||
|
server.SetConnection(
|
||
|
std::make_unique<ConnectionFileDescriptor>(accept_socket));
|
||
|
return llvm::Error::success();
|
||
|
}
|
||
|
|
||
|
GDBRemoteCommunication::ScopedTimeout::ScopedTimeout(
|
||
|
GDBRemoteCommunication &gdb_comm, std::chrono::seconds timeout)
|
||
|
: m_gdb_comm(gdb_comm), m_timeout_modified(false) {
|
||
|
auto curr_timeout = gdb_comm.GetPacketTimeout();
|
||
|
// Only update the timeout if the timeout is greater than the current
|
||
|
// timeout. If the current timeout is larger, then just use that.
|
||
|
if (curr_timeout < timeout) {
|
||
|
m_timeout_modified = true;
|
||
|
m_saved_timeout = m_gdb_comm.SetPacketTimeout(timeout);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
GDBRemoteCommunication::ScopedTimeout::~ScopedTimeout() {
|
||
|
// Only restore the timeout if we set it in the constructor.
|
||
|
if (m_timeout_modified)
|
||
|
m_gdb_comm.SetPacketTimeout(m_saved_timeout);
|
||
|
}
|
||
|
|
||
|
// This function is called via the Communications class read thread when bytes
|
||
|
// become available for this connection. This function will consume all
|
||
|
// incoming bytes and try to parse whole packets as they become available. Full
|
||
|
// packets are placed in a queue, so that all packet requests can simply pop
|
||
|
// from this queue. Async notification packets will be dispatched immediately
|
||
|
// to the ProcessGDBRemote Async thread via an event.
|
||
|
void GDBRemoteCommunication::AppendBytesToCache(const uint8_t *bytes,
|
||
|
size_t len, bool broadcast,
|
||
|
lldb::ConnectionStatus status) {
|
||
|
StringExtractorGDBRemote packet;
|
||
|
|
||
|
while (true) {
|
||
|
PacketType type = CheckForPacket(bytes, len, packet);
|
||
|
|
||
|
// scrub the data so we do not pass it back to CheckForPacket on future
|
||
|
// passes of the loop
|
||
|
bytes = nullptr;
|
||
|
len = 0;
|
||
|
|
||
|
// we may have received no packet so lets bail out
|
||
|
if (type == PacketType::Invalid)
|
||
|
break;
|
||
|
|
||
|
if (type == PacketType::Standard) {
|
||
|
// scope for the mutex
|
||
|
{
|
||
|
// lock down the packet queue
|
||
|
std::lock_guard<std::mutex> guard(m_packet_queue_mutex);
|
||
|
// push a new packet into the queue
|
||
|
m_packet_queue.push(packet);
|
||
|
// Signal condition variable that we have a packet
|
||
|
m_condition_queue_not_empty.notify_one();
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (type == PacketType::Notify) {
|
||
|
// put this packet into an event
|
||
|
const char *pdata = packet.GetStringRef().data();
|
||
|
|
||
|
// as the communication class, we are a broadcaster and the async thread
|
||
|
// is tuned to listen to us
|
||
|
BroadcastEvent(eBroadcastBitGdbReadThreadGotNotify,
|
||
|
new EventDataBytes(pdata));
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void llvm::format_provider<GDBRemoteCommunication::PacketResult>::format(
|
||
|
const GDBRemoteCommunication::PacketResult &result, raw_ostream &Stream,
|
||
|
StringRef Style) {
|
||
|
using PacketResult = GDBRemoteCommunication::PacketResult;
|
||
|
|
||
|
switch (result) {
|
||
|
case PacketResult::Success:
|
||
|
Stream << "Success";
|
||
|
break;
|
||
|
case PacketResult::ErrorSendFailed:
|
||
|
Stream << "ErrorSendFailed";
|
||
|
break;
|
||
|
case PacketResult::ErrorSendAck:
|
||
|
Stream << "ErrorSendAck";
|
||
|
break;
|
||
|
case PacketResult::ErrorReplyFailed:
|
||
|
Stream << "ErrorReplyFailed";
|
||
|
break;
|
||
|
case PacketResult::ErrorReplyTimeout:
|
||
|
Stream << "ErrorReplyTimeout";
|
||
|
break;
|
||
|
case PacketResult::ErrorReplyInvalid:
|
||
|
Stream << "ErrorReplyInvalid";
|
||
|
break;
|
||
|
case PacketResult::ErrorReplyAck:
|
||
|
Stream << "ErrorReplyAck";
|
||
|
break;
|
||
|
case PacketResult::ErrorDisconnected:
|
||
|
Stream << "ErrorDisconnected";
|
||
|
break;
|
||
|
case PacketResult::ErrorNoSequenceLock:
|
||
|
Stream << "ErrorNoSequenceLock";
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
std::string GDBRemoteCommunication::ExpandRLE(std::string packet) {
|
||
|
// Reserve enough byte for the most common case (no RLE used).
|
||
|
std::string decoded;
|
||
|
decoded.reserve(packet.size());
|
||
|
for (std::string::const_iterator c = packet.begin(); c != packet.end(); ++c) {
|
||
|
if (*c == '*') {
|
||
|
// '*' indicates RLE. Next character will give us the repeat count and
|
||
|
// previous character is what is to be repeated.
|
||
|
char char_to_repeat = decoded.back();
|
||
|
// Number of time the previous character is repeated.
|
||
|
int repeat_count = *++c + 3 - ' ';
|
||
|
// We have the char_to_repeat and repeat_count. Now push it in the
|
||
|
// packet.
|
||
|
for (int i = 0; i < repeat_count; ++i)
|
||
|
decoded.push_back(char_to_repeat);
|
||
|
} else if (*c == 0x7d) {
|
||
|
// 0x7d is the escape character. The next character is to be XOR'd with
|
||
|
// 0x20.
|
||
|
char escapee = *++c ^ 0x20;
|
||
|
decoded.push_back(escapee);
|
||
|
} else {
|
||
|
decoded.push_back(*c);
|
||
|
}
|
||
|
}
|
||
|
return decoded;
|
||
|
}
|