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GDBRemoteCommunicationClient.cpp
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GDBRemoteCommunicationClient.cpp
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//===-- GDBRemoteCommunicationClient.cpp ------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "GDBRemoteCommunicationClient.h"
// C Includes
#include <math.h>
#include <sys/stat.h>
// C++ Includes
#include <numeric>
#include <sstream>
// Other libraries and framework includes
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/State.h"
#include "lldb/Core/StreamGDBRemote.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Host/TimeValue.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/UnixSignals.h"
#include "lldb/Utility/JSON.h"
#include "lldb/Utility/LLDBAssert.h"
// Project includes
#include "ProcessGDBRemote.h"
#include "ProcessGDBRemoteLog.h"
#include "Utility/StringExtractorGDBRemote.h"
#include "lldb/Host/Config.h"
#include "llvm/ADT/StringSwitch.h"
#if defined(HAVE_LIBCOMPRESSION)
#include <compression.h>
#endif
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_gdb_remote;
//----------------------------------------------------------------------
// GDBRemoteCommunicationClient constructor
//----------------------------------------------------------------------
GDBRemoteCommunicationClient::GDBRemoteCommunicationClient()
: GDBRemoteClientBase("gdb-remote.client", "gdb-remote.client.rx_packet"),
m_supports_not_sending_acks(eLazyBoolCalculate),
m_supports_thread_suffix(eLazyBoolCalculate),
m_supports_threads_in_stop_reply(eLazyBoolCalculate),
m_supports_vCont_all(eLazyBoolCalculate),
m_supports_vCont_any(eLazyBoolCalculate),
m_supports_vCont_c(eLazyBoolCalculate),
m_supports_vCont_C(eLazyBoolCalculate),
m_supports_vCont_s(eLazyBoolCalculate),
m_supports_vCont_S(eLazyBoolCalculate),
m_qHostInfo_is_valid(eLazyBoolCalculate),
m_curr_pid_is_valid(eLazyBoolCalculate),
m_qProcessInfo_is_valid(eLazyBoolCalculate),
m_qGDBServerVersion_is_valid(eLazyBoolCalculate),
m_supports_alloc_dealloc_memory(eLazyBoolCalculate),
m_supports_memory_region_info(eLazyBoolCalculate),
m_supports_watchpoint_support_info(eLazyBoolCalculate),
m_supports_detach_stay_stopped(eLazyBoolCalculate),
m_watchpoints_trigger_after_instruction(eLazyBoolCalculate),
m_attach_or_wait_reply(eLazyBoolCalculate),
m_prepare_for_reg_writing_reply(eLazyBoolCalculate),
m_supports_p(eLazyBoolCalculate), m_supports_x(eLazyBoolCalculate),
m_avoid_g_packets(eLazyBoolCalculate),
m_supports_QSaveRegisterState(eLazyBoolCalculate),
m_supports_qXfer_auxv_read(eLazyBoolCalculate),
m_supports_qXfer_libraries_read(eLazyBoolCalculate),
m_supports_qXfer_libraries_svr4_read(eLazyBoolCalculate),
m_supports_qXfer_features_read(eLazyBoolCalculate),
m_supports_augmented_libraries_svr4_read(eLazyBoolCalculate),
m_supports_jThreadExtendedInfo(eLazyBoolCalculate),
m_supports_jLoadedDynamicLibrariesInfos(eLazyBoolCalculate),
m_supports_jGetSharedCacheInfo(eLazyBoolCalculate),
m_supports_qProcessInfoPID(true), m_supports_qfProcessInfo(true),
m_supports_qUserName(true), m_supports_qGroupName(true),
m_supports_qThreadStopInfo(true), m_supports_z0(true),
m_supports_z1(true), m_supports_z2(true), m_supports_z3(true),
m_supports_z4(true), m_supports_QEnvironment(true),
m_supports_QEnvironmentHexEncoded(true), m_supports_qSymbol(true),
m_qSymbol_requests_done(false), m_supports_qModuleInfo(true),
m_supports_jThreadsInfo(true), m_supports_jModulesInfo(true),
m_curr_pid(LLDB_INVALID_PROCESS_ID), m_curr_tid(LLDB_INVALID_THREAD_ID),
m_curr_tid_run(LLDB_INVALID_THREAD_ID),
m_num_supported_hardware_watchpoints(0), m_host_arch(), m_process_arch(),
m_os_version_major(UINT32_MAX), m_os_version_minor(UINT32_MAX),
m_os_version_update(UINT32_MAX), m_os_build(), m_os_kernel(),
m_hostname(), m_gdb_server_name(), m_gdb_server_version(UINT32_MAX),
m_default_packet_timeout(0), m_max_packet_size(0),
m_qSupported_response(), m_supported_async_json_packets_is_valid(false),
m_supported_async_json_packets_sp() {}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
GDBRemoteCommunicationClient::~GDBRemoteCommunicationClient() {
if (IsConnected())
Disconnect();
}
bool GDBRemoteCommunicationClient::HandshakeWithServer(Error *error_ptr) {
ResetDiscoverableSettings(false);
// Start the read thread after we send the handshake ack since if we
// fail to send the handshake ack, there is no reason to continue...
if (SendAck()) {
// Wait for any responses that might have been queued up in the remote
// GDB server and flush them all
StringExtractorGDBRemote response;
PacketResult packet_result = PacketResult::Success;
const uint32_t timeout_usec = 10 * 1000; // Wait for 10 ms for a response
while (packet_result == PacketResult::Success)
packet_result = ReadPacket(response, timeout_usec, false);
// The return value from QueryNoAckModeSupported() is true if the packet
// was sent and _any_ response (including UNIMPLEMENTED) was received),
// or false if no response was received. This quickly tells us if we have
// a live connection to a remote GDB server...
if (QueryNoAckModeSupported()) {
return true;
} else {
if (error_ptr)
error_ptr->SetErrorString("failed to get reply to handshake packet");
}
} else {
if (error_ptr)
error_ptr->SetErrorString("failed to send the handshake ack");
}
return false;
}
bool GDBRemoteCommunicationClient::GetEchoSupported() {
if (m_supports_qEcho == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_qEcho == eLazyBoolYes;
}
bool GDBRemoteCommunicationClient::GetAugmentedLibrariesSVR4ReadSupported() {
if (m_supports_augmented_libraries_svr4_read == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_augmented_libraries_svr4_read == eLazyBoolYes;
}
bool GDBRemoteCommunicationClient::GetQXferLibrariesSVR4ReadSupported() {
if (m_supports_qXfer_libraries_svr4_read == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_qXfer_libraries_svr4_read == eLazyBoolYes;
}
bool GDBRemoteCommunicationClient::GetQXferLibrariesReadSupported() {
if (m_supports_qXfer_libraries_read == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_qXfer_libraries_read == eLazyBoolYes;
}
bool GDBRemoteCommunicationClient::GetQXferAuxvReadSupported() {
if (m_supports_qXfer_auxv_read == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_qXfer_auxv_read == eLazyBoolYes;
}
bool GDBRemoteCommunicationClient::GetQXferFeaturesReadSupported() {
if (m_supports_qXfer_features_read == eLazyBoolCalculate) {
GetRemoteQSupported();
}
return m_supports_qXfer_features_read == eLazyBoolYes;
}
uint64_t GDBRemoteCommunicationClient::GetRemoteMaxPacketSize() {
if (m_max_packet_size == 0) {
GetRemoteQSupported();
}
return m_max_packet_size;
}
bool GDBRemoteCommunicationClient::QueryNoAckModeSupported() {
if (m_supports_not_sending_acks == eLazyBoolCalculate) {
m_send_acks = true;
m_supports_not_sending_acks = eLazyBoolNo;
// This is the first real packet that we'll send in a debug session and it
// may take a little
// longer than normal to receive a reply. Wait at least 6 seconds for a
// reply to this packet.
const uint32_t minimum_timeout = 6;
uint32_t old_timeout = GetPacketTimeoutInMicroSeconds() /
lldb_private::TimeValue::MicroSecPerSec;
GDBRemoteCommunication::ScopedTimeout timeout(
*this, std::max(old_timeout, minimum_timeout));
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("QStartNoAckMode", response, false) ==
PacketResult::Success) {
if (response.IsOKResponse()) {
m_send_acks = false;
m_supports_not_sending_acks = eLazyBoolYes;
}
return true;
}
}
return false;
}
void GDBRemoteCommunicationClient::GetListThreadsInStopReplySupported() {
if (m_supports_threads_in_stop_reply == eLazyBoolCalculate) {
m_supports_threads_in_stop_reply = eLazyBoolNo;
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("QListThreadsInStopReply", response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
m_supports_threads_in_stop_reply = eLazyBoolYes;
}
}
}
bool GDBRemoteCommunicationClient::GetVAttachOrWaitSupported() {
if (m_attach_or_wait_reply == eLazyBoolCalculate) {
m_attach_or_wait_reply = eLazyBoolNo;
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("qVAttachOrWaitSupported", response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
m_attach_or_wait_reply = eLazyBoolYes;
}
}
if (m_attach_or_wait_reply == eLazyBoolYes)
return true;
else
return false;
}
bool GDBRemoteCommunicationClient::GetSyncThreadStateSupported() {
if (m_prepare_for_reg_writing_reply == eLazyBoolCalculate) {
m_prepare_for_reg_writing_reply = eLazyBoolNo;
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("qSyncThreadStateSupported", response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
m_prepare_for_reg_writing_reply = eLazyBoolYes;
}
}
if (m_prepare_for_reg_writing_reply == eLazyBoolYes)
return true;
else
return false;
}
void GDBRemoteCommunicationClient::ResetDiscoverableSettings(bool did_exec) {
if (did_exec == false) {
// Hard reset everything, this is when we first connect to a GDB server
m_supports_not_sending_acks = eLazyBoolCalculate;
m_supports_thread_suffix = eLazyBoolCalculate;
m_supports_threads_in_stop_reply = eLazyBoolCalculate;
m_supports_vCont_c = eLazyBoolCalculate;
m_supports_vCont_C = eLazyBoolCalculate;
m_supports_vCont_s = eLazyBoolCalculate;
m_supports_vCont_S = eLazyBoolCalculate;
m_supports_p = eLazyBoolCalculate;
m_supports_x = eLazyBoolCalculate;
m_supports_QSaveRegisterState = eLazyBoolCalculate;
m_qHostInfo_is_valid = eLazyBoolCalculate;
m_curr_pid_is_valid = eLazyBoolCalculate;
m_qGDBServerVersion_is_valid = eLazyBoolCalculate;
m_supports_alloc_dealloc_memory = eLazyBoolCalculate;
m_supports_memory_region_info = eLazyBoolCalculate;
m_prepare_for_reg_writing_reply = eLazyBoolCalculate;
m_attach_or_wait_reply = eLazyBoolCalculate;
m_avoid_g_packets = eLazyBoolCalculate;
m_supports_qXfer_auxv_read = eLazyBoolCalculate;
m_supports_qXfer_libraries_read = eLazyBoolCalculate;
m_supports_qXfer_libraries_svr4_read = eLazyBoolCalculate;
m_supports_qXfer_features_read = eLazyBoolCalculate;
m_supports_augmented_libraries_svr4_read = eLazyBoolCalculate;
m_supports_qProcessInfoPID = true;
m_supports_qfProcessInfo = true;
m_supports_qUserName = true;
m_supports_qGroupName = true;
m_supports_qThreadStopInfo = true;
m_supports_z0 = true;
m_supports_z1 = true;
m_supports_z2 = true;
m_supports_z3 = true;
m_supports_z4 = true;
m_supports_QEnvironment = true;
m_supports_QEnvironmentHexEncoded = true;
m_supports_qSymbol = true;
m_qSymbol_requests_done = false;
m_supports_qModuleInfo = true;
m_host_arch.Clear();
m_os_version_major = UINT32_MAX;
m_os_version_minor = UINT32_MAX;
m_os_version_update = UINT32_MAX;
m_os_build.clear();
m_os_kernel.clear();
m_hostname.clear();
m_gdb_server_name.clear();
m_gdb_server_version = UINT32_MAX;
m_default_packet_timeout = 0;
m_max_packet_size = 0;
m_qSupported_response.clear();
m_supported_async_json_packets_is_valid = false;
m_supported_async_json_packets_sp.reset();
m_supports_jModulesInfo = true;
}
// These flags should be reset when we first connect to a GDB server
// and when our inferior process execs
m_qProcessInfo_is_valid = eLazyBoolCalculate;
m_process_arch.Clear();
}
void GDBRemoteCommunicationClient::GetRemoteQSupported() {
// Clear out any capabilities we expect to see in the qSupported response
m_supports_qXfer_auxv_read = eLazyBoolNo;
m_supports_qXfer_libraries_read = eLazyBoolNo;
m_supports_qXfer_libraries_svr4_read = eLazyBoolNo;
m_supports_augmented_libraries_svr4_read = eLazyBoolNo;
m_supports_qXfer_features_read = eLazyBoolNo;
m_max_packet_size = UINT64_MAX; // It's supposed to always be there, but if
// not, we assume no limit
// build the qSupported packet
std::vector<std::string> features = {"xmlRegisters=i386,arm,mips"};
StreamString packet;
packet.PutCString("qSupported");
for (uint32_t i = 0; i < features.size(); ++i) {
packet.PutCString(i == 0 ? ":" : ";");
packet.PutCString(features[i].c_str());
}
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse(packet.GetData(), response,
/*send_async=*/false) ==
PacketResult::Success) {
const char *response_cstr = response.GetStringRef().c_str();
// Hang on to the qSupported packet, so that platforms can do custom
// configuration of the transport before attaching/launching the
// process.
m_qSupported_response = response_cstr;
if (::strstr(response_cstr, "qXfer:auxv:read+"))
m_supports_qXfer_auxv_read = eLazyBoolYes;
if (::strstr(response_cstr, "qXfer:libraries-svr4:read+"))
m_supports_qXfer_libraries_svr4_read = eLazyBoolYes;
if (::strstr(response_cstr, "augmented-libraries-svr4-read")) {
m_supports_qXfer_libraries_svr4_read = eLazyBoolYes; // implied
m_supports_augmented_libraries_svr4_read = eLazyBoolYes;
}
if (::strstr(response_cstr, "qXfer:libraries:read+"))
m_supports_qXfer_libraries_read = eLazyBoolYes;
if (::strstr(response_cstr, "qXfer:features:read+"))
m_supports_qXfer_features_read = eLazyBoolYes;
// Look for a list of compressions in the features list e.g.
// qXfer:features:read+;PacketSize=20000;qEcho+;SupportedCompressions=zlib-deflate,lzma
const char *features_list = ::strstr(response_cstr, "qXfer:features:");
if (features_list) {
const char *compressions =
::strstr(features_list, "SupportedCompressions=");
if (compressions) {
std::vector<std::string> supported_compressions;
compressions += sizeof("SupportedCompressions=") - 1;
const char *end_of_compressions = strchr(compressions, ';');
if (end_of_compressions == NULL) {
end_of_compressions = strchr(compressions, '\0');
}
const char *current_compression = compressions;
while (current_compression < end_of_compressions) {
const char *next_compression_name = strchr(current_compression, ',');
const char *end_of_this_word = next_compression_name;
if (next_compression_name == NULL ||
end_of_compressions < next_compression_name) {
end_of_this_word = end_of_compressions;
}
if (end_of_this_word) {
if (end_of_this_word == current_compression) {
current_compression++;
} else {
std::string this_compression(
current_compression, end_of_this_word - current_compression);
supported_compressions.push_back(this_compression);
current_compression = end_of_this_word + 1;
}
} else {
supported_compressions.push_back(current_compression);
current_compression = end_of_compressions;
}
}
if (supported_compressions.size() > 0) {
MaybeEnableCompression(supported_compressions);
}
}
}
if (::strstr(response_cstr, "qEcho"))
m_supports_qEcho = eLazyBoolYes;
else
m_supports_qEcho = eLazyBoolNo;
const char *packet_size_str = ::strstr(response_cstr, "PacketSize=");
if (packet_size_str) {
StringExtractorGDBRemote packet_response(packet_size_str +
strlen("PacketSize="));
m_max_packet_size =
packet_response.GetHexMaxU64(/*little_endian=*/false, UINT64_MAX);
if (m_max_packet_size == 0) {
m_max_packet_size = UINT64_MAX; // Must have been a garbled response
Log *log(
ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("Garbled PacketSize spec in qSupported response");
}
}
}
}
bool GDBRemoteCommunicationClient::GetThreadSuffixSupported() {
if (m_supports_thread_suffix == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_thread_suffix = eLazyBoolNo;
if (SendPacketAndWaitForResponse("QThreadSuffixSupported", response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
m_supports_thread_suffix = eLazyBoolYes;
}
}
return m_supports_thread_suffix;
}
bool GDBRemoteCommunicationClient::GetVContSupported(char flavor) {
if (m_supports_vCont_c == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_vCont_any = eLazyBoolNo;
m_supports_vCont_all = eLazyBoolNo;
m_supports_vCont_c = eLazyBoolNo;
m_supports_vCont_C = eLazyBoolNo;
m_supports_vCont_s = eLazyBoolNo;
m_supports_vCont_S = eLazyBoolNo;
if (SendPacketAndWaitForResponse("vCont?", response, false) ==
PacketResult::Success) {
const char *response_cstr = response.GetStringRef().c_str();
if (::strstr(response_cstr, ";c"))
m_supports_vCont_c = eLazyBoolYes;
if (::strstr(response_cstr, ";C"))
m_supports_vCont_C = eLazyBoolYes;
if (::strstr(response_cstr, ";s"))
m_supports_vCont_s = eLazyBoolYes;
if (::strstr(response_cstr, ";S"))
m_supports_vCont_S = eLazyBoolYes;
if (m_supports_vCont_c == eLazyBoolYes &&
m_supports_vCont_C == eLazyBoolYes &&
m_supports_vCont_s == eLazyBoolYes &&
m_supports_vCont_S == eLazyBoolYes) {
m_supports_vCont_all = eLazyBoolYes;
}
if (m_supports_vCont_c == eLazyBoolYes ||
m_supports_vCont_C == eLazyBoolYes ||
m_supports_vCont_s == eLazyBoolYes ||
m_supports_vCont_S == eLazyBoolYes) {
m_supports_vCont_any = eLazyBoolYes;
}
}
}
switch (flavor) {
case 'a':
return m_supports_vCont_any;
case 'A':
return m_supports_vCont_all;
case 'c':
return m_supports_vCont_c;
case 'C':
return m_supports_vCont_C;
case 's':
return m_supports_vCont_s;
case 'S':
return m_supports_vCont_S;
default:
break;
}
return false;
}
GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationClient::SendThreadSpecificPacketAndWaitForResponse(
lldb::tid_t tid, StreamString &&payload, StringExtractorGDBRemote &response,
bool send_async) {
Lock lock(*this, send_async);
if (!lock) {
if (Log *log = ProcessGDBRemoteLog::GetLogIfAnyCategoryIsSet(
GDBR_LOG_PROCESS | GDBR_LOG_PACKETS))
log->Printf("GDBRemoteCommunicationClient::%s: Didn't get sequence mutex "
"for %s packet.",
__FUNCTION__, payload.GetString().c_str());
return PacketResult::ErrorNoSequenceLock;
}
if (GetThreadSuffixSupported())
payload.Printf(";thread:%4.4" PRIx64 ";", tid);
else {
if (!SetCurrentThread(tid))
return PacketResult::ErrorSendFailed;
}
return SendPacketAndWaitForResponseNoLock(payload.GetString(), response);
}
// Check if the target supports 'p' packet. It sends out a 'p'
// packet and checks the response. A normal packet will tell us
// that support is available.
//
// Takes a valid thread ID because p needs to apply to a thread.
bool GDBRemoteCommunicationClient::GetpPacketSupported(lldb::tid_t tid) {
if (m_supports_p == eLazyBoolCalculate) {
m_supports_p = eLazyBoolNo;
StreamString payload;
payload.PutCString("p0");
StringExtractorGDBRemote response;
if (SendThreadSpecificPacketAndWaitForResponse(tid, std::move(payload),
response, false) ==
PacketResult::Success &&
response.IsNormalResponse()) {
m_supports_p = eLazyBoolYes;
}
}
return m_supports_p;
}
StructuredData::ObjectSP GDBRemoteCommunicationClient::GetThreadsInfo() {
// Get information on all threads at one using the "jThreadsInfo" packet
StructuredData::ObjectSP object_sp;
if (m_supports_jThreadsInfo) {
StringExtractorGDBRemote response;
response.SetResponseValidatorToJSON();
if (SendPacketAndWaitForResponse("jThreadsInfo", response, false) ==
PacketResult::Success) {
if (response.IsUnsupportedResponse()) {
m_supports_jThreadsInfo = false;
} else if (!response.Empty()) {
object_sp = StructuredData::ParseJSON(response.GetStringRef());
}
}
}
return object_sp;
}
bool GDBRemoteCommunicationClient::GetThreadExtendedInfoSupported() {
if (m_supports_jThreadExtendedInfo == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_jThreadExtendedInfo = eLazyBoolNo;
if (SendPacketAndWaitForResponse("jThreadExtendedInfo:", response, false) ==
PacketResult::Success) {
if (response.IsOKResponse()) {
m_supports_jThreadExtendedInfo = eLazyBoolYes;
}
}
}
return m_supports_jThreadExtendedInfo;
}
bool GDBRemoteCommunicationClient::GetLoadedDynamicLibrariesInfosSupported() {
if (m_supports_jLoadedDynamicLibrariesInfos == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_jLoadedDynamicLibrariesInfos = eLazyBoolNo;
if (SendPacketAndWaitForResponse("jGetLoadedDynamicLibrariesInfos:",
response,
false) == PacketResult::Success) {
if (response.IsOKResponse()) {
m_supports_jLoadedDynamicLibrariesInfos = eLazyBoolYes;
}
}
}
return m_supports_jLoadedDynamicLibrariesInfos;
}
bool GDBRemoteCommunicationClient::GetSharedCacheInfoSupported() {
if (m_supports_jGetSharedCacheInfo == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_jGetSharedCacheInfo = eLazyBoolNo;
if (SendPacketAndWaitForResponse("jGetSharedCacheInfo:", response, false) ==
PacketResult::Success) {
if (response.IsOKResponse()) {
m_supports_jGetSharedCacheInfo = eLazyBoolYes;
}
}
}
return m_supports_jGetSharedCacheInfo;
}
bool GDBRemoteCommunicationClient::GetxPacketSupported() {
if (m_supports_x == eLazyBoolCalculate) {
StringExtractorGDBRemote response;
m_supports_x = eLazyBoolNo;
char packet[256];
snprintf(packet, sizeof(packet), "x0,0");
if (SendPacketAndWaitForResponse(packet, response, false) ==
PacketResult::Success) {
if (response.IsOKResponse())
m_supports_x = eLazyBoolYes;
}
}
return m_supports_x;
}
GDBRemoteCommunicationClient::PacketResult
GDBRemoteCommunicationClient::SendPacketsAndConcatenateResponses(
const char *payload_prefix, std::string &response_string) {
Lock lock(*this, false);
if (!lock) {
Log *log(ProcessGDBRemoteLog::GetLogIfAnyCategoryIsSet(GDBR_LOG_PROCESS |
GDBR_LOG_PACKETS));
if (log)
log->Printf("error: failed to get packet sequence mutex, not sending "
"packets with prefix '%s'",
payload_prefix);
return PacketResult::ErrorNoSequenceLock;
}
response_string = "";
std::string payload_prefix_str(payload_prefix);
unsigned int response_size = 0x1000;
if (response_size > GetRemoteMaxPacketSize()) { // May send qSupported packet
response_size = GetRemoteMaxPacketSize();
}
for (unsigned int offset = 0; true; offset += response_size) {
StringExtractorGDBRemote this_response;
// Construct payload
char sizeDescriptor[128];
snprintf(sizeDescriptor, sizeof(sizeDescriptor), "%x,%x", offset,
response_size);
PacketResult result = SendPacketAndWaitForResponseNoLock(
payload_prefix_str + sizeDescriptor, this_response);
if (result != PacketResult::Success)
return result;
const std::string &this_string = this_response.GetStringRef();
// Check for m or l as first character; l seems to mean this is the last
// chunk
char first_char = *this_string.c_str();
if (first_char != 'm' && first_char != 'l') {
return PacketResult::ErrorReplyInvalid;
}
// Concatenate the result so far (skipping 'm' or 'l')
response_string.append(this_string, 1, std::string::npos);
if (first_char == 'l')
// We're done
return PacketResult::Success;
}
}
lldb::pid_t GDBRemoteCommunicationClient::GetCurrentProcessID(bool allow_lazy) {
if (allow_lazy && m_curr_pid_is_valid == eLazyBoolYes)
return m_curr_pid;
// First try to retrieve the pid via the qProcessInfo request.
GetCurrentProcessInfo(allow_lazy);
if (m_curr_pid_is_valid == eLazyBoolYes) {
// We really got it.
return m_curr_pid;
} else {
// If we don't get a response for qProcessInfo, check if $qC gives us a
// result.
// $qC only returns a real process id on older debugserver and lldb-platform
// stubs.
// The gdb remote protocol documents $qC as returning the thread id, which
// newer
// debugserver and lldb-gdbserver stubs return correctly.
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("qC", strlen("qC"), response, false) ==
PacketResult::Success) {
if (response.GetChar() == 'Q') {
if (response.GetChar() == 'C') {
m_curr_pid = response.GetHexMaxU32(false, LLDB_INVALID_PROCESS_ID);
if (m_curr_pid != LLDB_INVALID_PROCESS_ID) {
m_curr_pid_is_valid = eLazyBoolYes;
return m_curr_pid;
}
}
}
}
// If we don't get a response for $qC, check if $qfThreadID gives us a
// result.
if (m_curr_pid == LLDB_INVALID_PROCESS_ID) {
std::vector<lldb::tid_t> thread_ids;
bool sequence_mutex_unavailable;
size_t size;
size = GetCurrentThreadIDs(thread_ids, sequence_mutex_unavailable);
if (size && sequence_mutex_unavailable == false) {
m_curr_pid = thread_ids.front();
m_curr_pid_is_valid = eLazyBoolYes;
return m_curr_pid;
}
}
}
return LLDB_INVALID_PROCESS_ID;
}
bool GDBRemoteCommunicationClient::GetLaunchSuccess(std::string &error_str) {
error_str.clear();
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("qLaunchSuccess", strlen("qLaunchSuccess"),
response, false) == PacketResult::Success) {
if (response.IsOKResponse())
return true;
if (response.GetChar() == 'E') {
// A string the describes what failed when launching...
error_str = response.GetStringRef().substr(1);
} else {
error_str.assign("unknown error occurred launching process");
}
} else {
error_str.assign("timed out waiting for app to launch");
}
return false;
}
int GDBRemoteCommunicationClient::SendArgumentsPacket(
const ProcessLaunchInfo &launch_info) {
// Since we don't get the send argv0 separate from the executable path, we
// need to
// make sure to use the actual executable path found in the launch_info...
std::vector<const char *> argv;
FileSpec exe_file = launch_info.GetExecutableFile();
std::string exe_path;
const char *arg = NULL;
const Args &launch_args = launch_info.GetArguments();
if (exe_file)
exe_path = exe_file.GetPath(false);
else {
arg = launch_args.GetArgumentAtIndex(0);
if (arg)
exe_path = arg;
}
if (!exe_path.empty()) {
argv.push_back(exe_path.c_str());
for (uint32_t i = 1; (arg = launch_args.GetArgumentAtIndex(i)) != NULL;
++i) {
if (arg)
argv.push_back(arg);
}
}
if (!argv.empty()) {
StreamString packet;
packet.PutChar('A');
for (size_t i = 0, n = argv.size(); i < n; ++i) {
arg = argv[i];
const int arg_len = strlen(arg);
if (i > 0)
packet.PutChar(',');
packet.Printf("%i,%i,", arg_len * 2, (int)i);
packet.PutBytesAsRawHex8(arg, arg_len);
}
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse(packet.GetData(), packet.GetSize(),
response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
return 0;
uint8_t error = response.GetError();
if (error)
return error;
}
}
return -1;
}
int GDBRemoteCommunicationClient::SendEnvironmentPacket(
char const *name_equal_value) {
if (name_equal_value && name_equal_value[0]) {
StreamString packet;
bool send_hex_encoding = false;
for (const char *p = name_equal_value;
*p != '\0' && send_hex_encoding == false; ++p) {
if (isprint(*p)) {
switch (*p) {
case '$':
case '#':
case '*':
case '}':
send_hex_encoding = true;
break;
default:
break;
}
} else {
// We have non printable characters, lets hex encode this...
send_hex_encoding = true;
}
}
StringExtractorGDBRemote response;
if (send_hex_encoding) {
if (m_supports_QEnvironmentHexEncoded) {
packet.PutCString("QEnvironmentHexEncoded:");
packet.PutBytesAsRawHex8(name_equal_value, strlen(name_equal_value));
if (SendPacketAndWaitForResponse(packet.GetData(), packet.GetSize(),
response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
return 0;
uint8_t error = response.GetError();
if (error)
return error;
if (response.IsUnsupportedResponse())
m_supports_QEnvironmentHexEncoded = false;
}
}
} else if (m_supports_QEnvironment) {
packet.Printf("QEnvironment:%s", name_equal_value);
if (SendPacketAndWaitForResponse(packet.GetData(), packet.GetSize(),
response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
return 0;
uint8_t error = response.GetError();
if (error)
return error;
if (response.IsUnsupportedResponse())
m_supports_QEnvironment = false;
}
}
}
return -1;
}
int GDBRemoteCommunicationClient::SendLaunchArchPacket(char const *arch) {
if (arch && arch[0]) {
StreamString packet;
packet.Printf("QLaunchArch:%s", arch);
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse(packet.GetData(), packet.GetSize(),
response,
false) == PacketResult::Success) {
if (response.IsOKResponse())
return 0;
uint8_t error = response.GetError();
if (error)
return error;
}
}
return -1;
}
int GDBRemoteCommunicationClient::SendLaunchEventDataPacket(
char const *data, bool *was_supported) {
if (data && *data != '\0') {
StreamString packet;
packet.Printf("QSetProcessEvent:%s", data);
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse(packet.GetData(), packet.GetSize(),
response,
false) == PacketResult::Success) {
if (response.IsOKResponse()) {
if (was_supported)
*was_supported = true;
return 0;
} else if (response.IsUnsupportedResponse()) {
if (was_supported)
*was_supported = false;
return -1;
} else {
uint8_t error = response.GetError();
if (was_supported)
*was_supported = true;
if (error)
return error;
}
}
}
return -1;
}
bool GDBRemoteCommunicationClient::GetOSVersion(uint32_t &major,
uint32_t &minor,
uint32_t &update) {
if (GetHostInfo()) {
if (m_os_version_major != UINT32_MAX) {
major = m_os_version_major;
minor = m_os_version_minor;
update = m_os_version_update;
return true;
}
}
return false;
}
bool GDBRemoteCommunicationClient::GetOSBuildString(std::string &s) {
if (GetHostInfo()) {
if (!m_os_build.empty()) {
s = m_os_build;
return true;
}
}
s.clear();
return false;
}
bool GDBRemoteCommunicationClient::GetOSKernelDescription(std::string &s) {
if (GetHostInfo()) {
if (!m_os_kernel.empty()) {
s = m_os_kernel;
return true;
}
}
s.clear();
return false;
}
bool GDBRemoteCommunicationClient::GetHostname(std::string &s) {
if (GetHostInfo()) {
if (!m_hostname.empty()) {
s = m_hostname;
return true;
}
}
s.clear();
return false;
}
ArchSpec GDBRemoteCommunicationClient::GetSystemArchitecture() {
if (GetHostInfo())
return m_host_arch;
return ArchSpec();
}
const lldb_private::ArchSpec &
GDBRemoteCommunicationClient::GetProcessArchitecture() {
if (m_qProcessInfo_is_valid == eLazyBoolCalculate)
GetCurrentProcessInfo();
return m_process_arch;
}
bool GDBRemoteCommunicationClient::GetGDBServerVersion() {
if (m_qGDBServerVersion_is_valid == eLazyBoolCalculate) {
m_gdb_server_name.clear();
m_gdb_server_version = 0;
m_qGDBServerVersion_is_valid = eLazyBoolNo;
StringExtractorGDBRemote response;
if (SendPacketAndWaitForResponse("qGDBServerVersion", response, false) ==
PacketResult::Success) {
if (response.IsNormalResponse()) {
llvm::StringRef name, value;
bool success = false;
while (response.GetNameColonValue(name, value)) {
if (name.equals("name")) {
success = true;
m_gdb_server_name = value;
} else if (name.equals("version")) {
llvm::StringRef major, minor;
std::tie(major, minor) = value.split('.');
if (!major.getAsInteger(0, m_gdb_server_version))
success = true;
}
}
if (success)
m_qGDBServerVersion_is_valid = eLazyBoolYes;
}
}
}
return m_qGDBServerVersion_is_valid == eLazyBoolYes;
}