diff --git a/lldb/include/lldb/Utility/StringExtractorGDBRemote.h b/lldb/include/lldb/Utility/StringExtractorGDBRemote.h --- a/lldb/include/lldb/Utility/StringExtractorGDBRemote.h +++ b/lldb/include/lldb/Utility/StringExtractorGDBRemote.h @@ -128,7 +128,7 @@ eServerPacketType_qVAttachOrWaitSupported, eServerPacketType_qWatchpointSupportInfo, eServerPacketType_qWatchpointSupportInfoSupported, - eServerPacketType_qXfer_auxv_read, + eServerPacketType_qXfer, eServerPacketType_jSignalsInfo, eServerPacketType_jModulesInfo, diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h --- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h +++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h @@ -15,6 +15,9 @@ #include "GDBRemoteCommunication.h" #include "lldb/lldb-private-forward.h" +#include "llvm/Support/Errc.h" +#include "llvm/Support/Error.h" + class StringExtractorGDBRemote; namespace lldb_private { @@ -59,6 +62,8 @@ PacketResult SendErrorResponse(const Status &error); + PacketResult SendErrorResponse(llvm::Error error); + PacketResult SendUnimplementedResponse(const char *packet); PacketResult SendErrorResponse(uint8_t error); @@ -72,6 +77,34 @@ DISALLOW_COPY_AND_ASSIGN(GDBRemoteCommunicationServer); }; +class PacketUnimplementedError + : public llvm::ErrorInfo { +public: + using llvm::ErrorInfo::ErrorInfo; // inherit constructors + PacketUnimplementedError(const llvm::Twine &S) + : ErrorInfo(S, llvm::errc::not_supported) {} + + PacketUnimplementedError() : ErrorInfo(llvm::errc::not_supported) {} +}; + +class PacketError : public llvm::ErrorInfo { +public: + static char ID; + + PacketError(uint8_t error_number) : m_error_number(error_number) {} + uint8_t GetErrorNumber() { return m_error_number; } + void log(llvm::raw_ostream &OS) const override { + OS << "Packet error " << m_error_number << "."; + } + std::error_code convertToErrorCode() const override { + return llvm::inconvertibleErrorCode(); + } + +private: + uint8_t m_error_number; +}; + } // namespace process_gdb_remote } // namespace lldb_private diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp --- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp +++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp @@ -113,6 +113,21 @@ } GDBRemoteCommunication::PacketResult +GDBRemoteCommunicationServer::SendErrorResponse(llvm::Error error) { + GDBRemoteCommunication::PacketResult result; + llvm::handleAllErrors( + std::move(error), + [&](PacketUnimplementedError &e) { + result = SendUnimplementedResponse(e.message().c_str()); + }, + [&](PacketError &e) { result = SendErrorResponse(e.GetErrorNumber()); }, + [&](std::unique_ptr e) { + result = SendErrorResponse(std::move(e)); + }); + return result; +} + +GDBRemoteCommunication::PacketResult GDBRemoteCommunicationServer::Handle_QErrorStringEnable( StringExtractorGDBRemote &packet) { m_send_error_strings = true; @@ -138,3 +153,5 @@ bool GDBRemoteCommunicationServer::HandshakeWithClient() { return GetAck() == PacketResult::Success; } + +char PacketError::ID; diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h --- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h +++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h @@ -82,7 +82,8 @@ MainLoop::ReadHandleUP m_stdio_handle_up; lldb::StateType m_inferior_prev_state = lldb::StateType::eStateInvalid; - std::unique_ptr m_active_auxv_buffer_up; + std::unordered_map> + m_xfer_buffer_map; std::mutex m_saved_registers_mutex; std::unordered_map m_saved_registers_map; uint32_t m_next_saved_registers_id = 1; @@ -150,7 +151,7 @@ PacketResult Handle_s(StringExtractorGDBRemote &packet); - PacketResult Handle_qXfer_auxv_read(StringExtractorGDBRemote &packet); + PacketResult Handle_qXfer(StringExtractorGDBRemote &packet); PacketResult Handle_QSaveRegisterState(StringExtractorGDBRemote &packet); @@ -193,6 +194,9 @@ FileSpec FindModuleFile(const std::string &module_path, const ArchSpec &arch) override; + llvm::Expected> + ReadXferObject(llvm::StringRef object, llvm::StringRef annex); + private: void HandleInferiorState_Exited(NativeProcessProtocol *process); diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp --- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp +++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp @@ -144,8 +144,8 @@ StringExtractorGDBRemote::eServerPacketType_qWatchpointSupportInfo, &GDBRemoteCommunicationServerLLGS::Handle_qWatchpointSupportInfo); RegisterMemberFunctionHandler( - StringExtractorGDBRemote::eServerPacketType_qXfer_auxv_read, - &GDBRemoteCommunicationServerLLGS::Handle_qXfer_auxv_read); + StringExtractorGDBRemote::eServerPacketType_qXfer, + &GDBRemoteCommunicationServerLLGS::Handle_qXfer); RegisterMemberFunctionHandler(StringExtractorGDBRemote::eServerPacketType_s, &GDBRemoteCommunicationServerLLGS::Handle_s); RegisterMemberFunctionHandler( @@ -2747,47 +2747,19 @@ return PacketResult::Success; } -GDBRemoteCommunication::PacketResult -GDBRemoteCommunicationServerLLGS::Handle_qXfer_auxv_read( - StringExtractorGDBRemote &packet) { -// *BSD impls should be able to do this too. -#if defined(__linux__) || defined(__NetBSD__) - Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS)); - - // Parse out the offset. - packet.SetFilePos(strlen("qXfer:auxv:read::")); - if (packet.GetBytesLeft() < 1) - return SendIllFormedResponse(packet, - "qXfer:auxv:read:: packet missing offset"); - - const uint64_t auxv_offset = - packet.GetHexMaxU64(false, std::numeric_limits::max()); - if (auxv_offset == std::numeric_limits::max()) - return SendIllFormedResponse(packet, - "qXfer:auxv:read:: packet missing offset"); - - // Parse out comma. - if (packet.GetBytesLeft() < 1 || packet.GetChar() != ',') - return SendIllFormedResponse( - packet, "qXfer:auxv:read:: packet missing comma after offset"); - - // Parse out the length. - const uint64_t auxv_length = - packet.GetHexMaxU64(false, std::numeric_limits::max()); - if (auxv_length == std::numeric_limits::max()) - return SendIllFormedResponse(packet, - "qXfer:auxv:read:: packet missing length"); - - // Grab the auxv data if we need it. - if (!m_active_auxv_buffer_up) { +llvm::Expected> +GDBRemoteCommunicationServerLLGS::ReadXferObject(llvm::StringRef object, + llvm::StringRef annex) { + if (object == "auxv") { + Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS)); // Make sure we have a valid process. if (!m_debugged_process_up || (m_debugged_process_up->GetID() == LLDB_INVALID_PROCESS_ID)) { if (log) - log->Printf( - "GDBRemoteCommunicationServerLLGS::%s failed, no process available", - __FUNCTION__); - return SendErrorResponse(0x10); + log->Printf("GDBRemoteCommunicationServerLLGS::%s failed, no process " + "available", + __FUNCTION__); + return llvm::make_error(0x10); } // Grab the auxv data. @@ -2795,46 +2767,88 @@ if (!buffer_or_error) { std::error_code ec = buffer_or_error.getError(); LLDB_LOG(log, "no auxv data retrieved: {0}", ec.message()); - return SendErrorResponse(ec.value()); + return llvm::make_error(ec.value()); } - m_active_auxv_buffer_up = std::move(*buffer_or_error); + return std::move(*buffer_or_error); } + return llvm::make_error( + "Xfer object not supported"); +} + +GDBRemoteCommunication::PacketResult +GDBRemoteCommunicationServerLLGS::Handle_qXfer( + StringExtractorGDBRemote &packet) { + SmallVector fields; + // The packet format is "qXfer::::offset,length" + StringRef(packet.GetStringRef()).split(fields, ':', 4); + if (fields.size() != 5) + return SendIllFormedResponse(packet, "malformed qXfer packet"); + auto &xfer_object = fields[1]; + auto &xfer_action = fields[2]; + auto &xfer_annex = fields[3]; + StringExtractor offset_data(fields[4]); + if (xfer_action != "read") + return SendUnimplementedResponse("qXfer action not supported"); + std::string buffer_key = std::string(xfer_object) + std::string(xfer_action) + + std::string(xfer_annex); + // Parse offset. + const uint64_t xfer_offset = + offset_data.GetHexMaxU64(false, std::numeric_limits::max()); + if (xfer_offset == std::numeric_limits::max()) + return SendIllFormedResponse(packet, "qXfer packet missing offset"); + // Parse out comma. + if (offset_data.GetChar() != ',') + return SendIllFormedResponse(packet, + "qXfer packet missing comma after offset"); + // Parse out the length. + const uint64_t xfer_length = + offset_data.GetHexMaxU64(false, std::numeric_limits::max()); + if (xfer_length == std::numeric_limits::max()) + return SendIllFormedResponse(packet, "qXfer packet missing length"); + + // Get a previously constructed buffer if it exists or create it now. + std::shared_ptr memory_buffer_up; + auto buffer_it = m_xfer_buffer_map.find(buffer_key); + if (buffer_it == m_xfer_buffer_map.end()) { + auto buffer_up = ReadXferObject(xfer_object, xfer_annex); + if (!buffer_up) + return SendErrorResponse(buffer_up.takeError()); + buffer_it = m_xfer_buffer_map + .insert(std::make_pair(buffer_key, std::move(*buffer_up))) + .first; + } + + // Send back the response StreamGDBRemote response; bool done_with_buffer = false; - - llvm::StringRef buffer = m_active_auxv_buffer_up->getBuffer(); - if (auxv_offset >= buffer.size()) { + llvm::StringRef buffer = buffer_it->second->getBuffer(); + if (xfer_offset >= buffer.size()) { // We have nothing left to send. Mark the buffer as complete. response.PutChar('l'); done_with_buffer = true; } else { // Figure out how many bytes are available starting at the given offset. - buffer = buffer.drop_front(auxv_offset); - + buffer = buffer.drop_front(xfer_offset); // Mark the response type according to whether we're reading the remainder - // of the auxv data. - if (auxv_length >= buffer.size()) { + // of the data. + if (xfer_length >= buffer.size()) { // There will be nothing left to read after this response.PutChar('l'); done_with_buffer = true; } else { // There will still be bytes to read after this request. response.PutChar('m'); - buffer = buffer.take_front(auxv_length); + buffer = buffer.take_front(xfer_length); } - // Now write the data in encoded binary form. response.PutEscapedBytes(buffer.data(), buffer.size()); } if (done_with_buffer) - m_active_auxv_buffer_up.reset(); + m_xfer_buffer_map.erase(buffer_key); return SendPacketNoLock(response.GetString()); -#else - return SendUnimplementedResponse("not implemented on this platform"); -#endif } GDBRemoteCommunication::PacketResult @@ -3259,8 +3273,8 @@ void GDBRemoteCommunicationServerLLGS::ClearProcessSpecificData() { Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS)); - LLDB_LOG(log, "clearing auxv buffer: {0}", m_active_auxv_buffer_up.get()); - m_active_auxv_buffer_up.reset(); + LLDB_LOG(log, "clearing {0} xfer buffers", m_xfer_buffer_map.size()); + m_xfer_buffer_map.clear(); } FileSpec diff --git a/lldb/source/Utility/StringExtractorGDBRemote.cpp b/lldb/source/Utility/StringExtractorGDBRemote.cpp --- a/lldb/source/Utility/StringExtractorGDBRemote.cpp +++ b/lldb/source/Utility/StringExtractorGDBRemote.cpp @@ -285,8 +285,8 @@ break; case 'X': - if (PACKET_STARTS_WITH("qXfer:auxv:read::")) - return eServerPacketType_qXfer_auxv_read; + if (PACKET_STARTS_WITH("qXfer:")) + return eServerPacketType_qXfer; break; } break;