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llvm-project/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp

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//===-- ProcessGDBRemote.cpp ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Config.h"
#include <errno.h>
#include <stdlib.h>
#ifndef LLDB_DISABLE_POSIX
#include <netinet/in.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <algorithm>
#include <csignal>
#include <map>
#include <mutex>
#include <sstream>
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/Value.h"
#include "lldb/DataFormatters/FormatManager.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostThread.h"
#include "lldb/Host/PosixApi.h"
#include "lldb/Host/PseudoTerminal.h"
#include "lldb/Host/StringConvert.h"
#include "lldb/Host/Symbols.h"
#include "lldb/Host/ThreadLauncher.h"
#include "lldb/Host/XML.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandObject.h"
#include "lldb/Interpreter/CommandObjectMultiword.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Interpreter/OptionArgParser.h"
#include "lldb/Interpreter/OptionGroupBoolean.h"
#include "lldb/Interpreter/OptionGroupUInt64.h"
#include "lldb/Interpreter/OptionValueProperties.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Interpreter/Property.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/MemoryRegionInfo.h"
#include "lldb/Target/SystemRuntime.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/TargetList.h"
#include "lldb/Target/ThreadPlanCallFunction.h"
#include "lldb/Utility/Args.h"
#include "lldb/Utility/CleanUp.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/Reproducer.h"
#include "lldb/Utility/State.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "GDBRemoteRegisterContext.h"
#include "Plugins/Platform/MacOSX/PlatformRemoteiOS.h"
#include "Plugins/Process/Utility/GDBRemoteSignals.h"
#include "Plugins/Process/Utility/InferiorCallPOSIX.h"
#include "Plugins/Process/Utility/StopInfoMachException.h"
#include "ProcessGDBRemote.h"
#include "ProcessGDBRemoteLog.h"
#include "ThreadGDBRemote.h"
#include "lldb/Host/Host.h"
#include "lldb/Utility/StringExtractorGDBRemote.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUGSERVER_BASENAME "debugserver"
using namespace llvm;
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_gdb_remote;
namespace lldb {
// Provide a function that can easily dump the packet history if we know a
// ProcessGDBRemote * value (which we can get from logs or from debugging). We
// need the function in the lldb namespace so it makes it into the final
// executable since the LLDB shared library only exports stuff in the lldb
// namespace. This allows you to attach with a debugger and call this function
// and get the packet history dumped to a file.
void DumpProcessGDBRemotePacketHistory(void *p, const char *path) {
StreamFile strm;
Status error = FileSystem::Instance().Open(strm.GetFile(), FileSpec(path),
File::eOpenOptionWrite |
File::eOpenOptionCanCreate);
if (error.Success())
((ProcessGDBRemote *)p)->GetGDBRemote().DumpHistory(strm);
}
} // namespace lldb
namespace {
static constexpr PropertyDefinition g_properties[] = {
{"packet-timeout", OptionValue::eTypeUInt64, true, 1, NULL, {},
"Specify the default packet timeout in seconds."},
{"target-definition-file", OptionValue::eTypeFileSpec, true, 0, NULL, {},
"The file that provides the description for remote target registers."}};
enum { ePropertyPacketTimeout, ePropertyTargetDefinitionFile };
class PluginProperties : public Properties {
public:
static ConstString GetSettingName() {
return ProcessGDBRemote::GetPluginNameStatic();
}
PluginProperties() : Properties() {
m_collection_sp.reset(new OptionValueProperties(GetSettingName()));
m_collection_sp->Initialize(g_properties);
}
virtual ~PluginProperties() {}
uint64_t GetPacketTimeout() {
const uint32_t idx = ePropertyPacketTimeout;
return m_collection_sp->GetPropertyAtIndexAsUInt64(
NULL, idx, g_properties[idx].default_uint_value);
}
bool SetPacketTimeout(uint64_t timeout) {
const uint32_t idx = ePropertyPacketTimeout;
return m_collection_sp->SetPropertyAtIndexAsUInt64(NULL, idx, timeout);
}
FileSpec GetTargetDefinitionFile() const {
const uint32_t idx = ePropertyTargetDefinitionFile;
return m_collection_sp->GetPropertyAtIndexAsFileSpec(NULL, idx);
}
};
typedef std::shared_ptr<PluginProperties> ProcessKDPPropertiesSP;
static const ProcessKDPPropertiesSP &GetGlobalPluginProperties() {
static ProcessKDPPropertiesSP g_settings_sp;
if (!g_settings_sp)
g_settings_sp.reset(new PluginProperties());
return g_settings_sp;
}
class ProcessGDBRemoteProvider : public repro::Provider {
public:
ProcessGDBRemoteProvider(const FileSpec &directory) : Provider(directory) {
m_info.name = "gdb-remote";
m_info.files.push_back("gdb-remote.yaml");
}
raw_ostream *GetHistoryStream() {
FileSpec history_file =
GetDirectory().CopyByAppendingPathComponent("gdb-remote.yaml");
std::error_code EC;
m_stream_up = llvm::make_unique<raw_fd_ostream>(history_file.GetPath(), EC,
sys::fs::OpenFlags::F_None);
return m_stream_up.get();
}
void SetCallback(std::function<void()> callback) {
m_callback = std::move(callback);
}
void Keep() override { m_callback(); }
void Discard() override { m_callback(); }
private:
std::function<void()> m_callback;
std::unique_ptr<raw_fd_ostream> m_stream_up;
};
} // namespace
// TODO Randomly assigning a port is unsafe. We should get an unused
// ephemeral port from the kernel and make sure we reserve it before passing it
// to debugserver.
#if defined(__APPLE__)
#define LOW_PORT (IPPORT_RESERVED)
#define HIGH_PORT (IPPORT_HIFIRSTAUTO)
#else
#define LOW_PORT (1024u)
#define HIGH_PORT (49151u)
#endif
#if defined(__APPLE__) && \
(defined(__arm__) || defined(__arm64__) || defined(__aarch64__))
static bool rand_initialized = false;
static inline uint16_t get_random_port() {
if (!rand_initialized) {
time_t seed = time(NULL);
rand_initialized = true;
srand(seed);
}
return (rand() % (HIGH_PORT - LOW_PORT)) + LOW_PORT;
}
#endif
ConstString ProcessGDBRemote::GetPluginNameStatic() {
static ConstString g_name("gdb-remote");
return g_name;
}
const char *ProcessGDBRemote::GetPluginDescriptionStatic() {
return "GDB Remote protocol based debugging plug-in.";
}
void ProcessGDBRemote::Terminate() {
PluginManager::UnregisterPlugin(ProcessGDBRemote::CreateInstance);
}
lldb::ProcessSP
ProcessGDBRemote::CreateInstance(lldb::TargetSP target_sp,
ListenerSP listener_sp,
const FileSpec *crash_file_path) {
lldb::ProcessSP process_sp;
if (crash_file_path == NULL)
process_sp.reset(new ProcessGDBRemote(target_sp, listener_sp));
return process_sp;
}
bool ProcessGDBRemote::CanDebug(lldb::TargetSP target_sp,
bool plugin_specified_by_name) {
if (plugin_specified_by_name)
return true;
// For now we are just making sure the file exists for a given module
Module *exe_module = target_sp->GetExecutableModulePointer();
if (exe_module) {
ObjectFile *exe_objfile = exe_module->GetObjectFile();
// We can't debug core files...
switch (exe_objfile->GetType()) {
case ObjectFile::eTypeInvalid:
case ObjectFile::eTypeCoreFile:
case ObjectFile::eTypeDebugInfo:
case ObjectFile::eTypeObjectFile:
case ObjectFile::eTypeSharedLibrary:
case ObjectFile::eTypeStubLibrary:
case ObjectFile::eTypeJIT:
return false;
case ObjectFile::eTypeExecutable:
case ObjectFile::eTypeDynamicLinker:
case ObjectFile::eTypeUnknown:
break;
}
return FileSystem::Instance().Exists(exe_module->GetFileSpec());
}
// However, if there is no executable module, we return true since we might
// be preparing to attach.
return true;
}
//----------------------------------------------------------------------
// ProcessGDBRemote constructor
//----------------------------------------------------------------------
ProcessGDBRemote::ProcessGDBRemote(lldb::TargetSP target_sp,
ListenerSP listener_sp)
: Process(target_sp, listener_sp),
m_debugserver_pid(LLDB_INVALID_PROCESS_ID), m_last_stop_packet_mutex(),
m_register_info(),
m_async_broadcaster(NULL, "lldb.process.gdb-remote.async-broadcaster"),
m_async_listener_sp(
Listener::MakeListener("lldb.process.gdb-remote.async-listener")),
m_async_thread_state_mutex(), m_thread_ids(), m_thread_pcs(),
m_jstopinfo_sp(), m_jthreadsinfo_sp(), m_continue_c_tids(),
m_continue_C_tids(), m_continue_s_tids(), m_continue_S_tids(),
m_max_memory_size(0), m_remote_stub_max_memory_size(0),
m_addr_to_mmap_size(), m_thread_create_bp_sp(),
m_waiting_for_attach(false), m_destroy_tried_resuming(false),
m_command_sp(), m_breakpoint_pc_offset(0),
m_initial_tid(LLDB_INVALID_THREAD_ID), m_replay_mode(false),
m_allow_flash_writes(false), m_erased_flash_ranges() {
m_async_broadcaster.SetEventName(eBroadcastBitAsyncThreadShouldExit,
"async thread should exit");
m_async_broadcaster.SetEventName(eBroadcastBitAsyncContinue,
"async thread continue");
m_async_broadcaster.SetEventName(eBroadcastBitAsyncThreadDidExit,
"async thread did exit");
repro::Generator *generator = repro::Reproducer::Instance().GetGenerator();
if (generator) {
ProcessGDBRemoteProvider &provider =
generator->CreateProvider<ProcessGDBRemoteProvider>();
// Set the history stream to the stream owned by the provider.
m_gdb_comm.SetHistoryStream(provider.GetHistoryStream());
// Make sure to clear the stream again when we're finished.
provider.SetCallback([&]() { m_gdb_comm.SetHistoryStream(nullptr); });
}
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_ASYNC));
const uint32_t async_event_mask =
eBroadcastBitAsyncContinue | eBroadcastBitAsyncThreadShouldExit;
if (m_async_listener_sp->StartListeningForEvents(
&m_async_broadcaster, async_event_mask) != async_event_mask) {
if (log)
log->Printf("ProcessGDBRemote::%s failed to listen for "
"m_async_broadcaster events",
__FUNCTION__);
}
const uint32_t gdb_event_mask =
Communication::eBroadcastBitReadThreadDidExit |
GDBRemoteCommunication::eBroadcastBitGdbReadThreadGotNotify;
if (m_async_listener_sp->StartListeningForEvents(
&m_gdb_comm, gdb_event_mask) != gdb_event_mask) {
if (log)
log->Printf("ProcessGDBRemote::%s failed to listen for m_gdb_comm events",
__FUNCTION__);
}
const uint64_t timeout_seconds =
GetGlobalPluginProperties()->GetPacketTimeout();
if (timeout_seconds > 0)
m_gdb_comm.SetPacketTimeout(std::chrono::seconds(timeout_seconds));
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
ProcessGDBRemote::~ProcessGDBRemote() {
// m_mach_process.UnregisterNotificationCallbacks (this);
Clear();
// We need to call finalize on the process before destroying ourselves to
// make sure all of the broadcaster cleanup goes as planned. If we destruct
// this class, then Process::~Process() might have problems trying to fully
// destroy the broadcaster.
Finalize();
// The general Finalize is going to try to destroy the process and that
// SHOULD shut down the async thread. However, if we don't kill it it will
// get stranded and its connection will go away so when it wakes up it will
// crash. So kill it for sure here.
StopAsyncThread();
KillDebugserverProcess();
}
//----------------------------------------------------------------------
// PluginInterface
//----------------------------------------------------------------------
ConstString ProcessGDBRemote::GetPluginName() { return GetPluginNameStatic(); }
uint32_t ProcessGDBRemote::GetPluginVersion() { return 1; }
bool ProcessGDBRemote::ParsePythonTargetDefinition(
const FileSpec &target_definition_fspec) {
ScriptInterpreter *interpreter =
GetTarget().GetDebugger().GetCommandInterpreter().GetScriptInterpreter();
Status error;
StructuredData::ObjectSP module_object_sp(
interpreter->LoadPluginModule(target_definition_fspec, error));
if (module_object_sp) {
StructuredData::DictionarySP target_definition_sp(
interpreter->GetDynamicSettings(module_object_sp, &GetTarget(),
"gdb-server-target-definition", error));
if (target_definition_sp) {
StructuredData::ObjectSP target_object(
target_definition_sp->GetValueForKey("host-info"));
if (target_object) {
if (auto host_info_dict = target_object->GetAsDictionary()) {
StructuredData::ObjectSP triple_value =
host_info_dict->GetValueForKey("triple");
if (auto triple_string_value = triple_value->GetAsString()) {
std::string triple_string = triple_string_value->GetValue();
ArchSpec host_arch(triple_string.c_str());
if (!host_arch.IsCompatibleMatch(GetTarget().GetArchitecture())) {
GetTarget().SetArchitecture(host_arch);
}
}
}
}
m_breakpoint_pc_offset = 0;
StructuredData::ObjectSP breakpoint_pc_offset_value =
target_definition_sp->GetValueForKey("breakpoint-pc-offset");
if (breakpoint_pc_offset_value) {
if (auto breakpoint_pc_int_value =
breakpoint_pc_offset_value->GetAsInteger())
m_breakpoint_pc_offset = breakpoint_pc_int_value->GetValue();
}
if (m_register_info.SetRegisterInfo(*target_definition_sp,
GetTarget().GetArchitecture()) > 0) {
return true;
}
}
}
return false;
}
// If the remote stub didn't give us eh_frame or DWARF register numbers for a
// register, see if the ABI can provide them.
// DWARF and eh_frame register numbers are defined as a part of the ABI.
static void AugmentRegisterInfoViaABI(RegisterInfo &reg_info,
ConstString reg_name, ABISP abi_sp) {
if (reg_info.kinds[eRegisterKindEHFrame] == LLDB_INVALID_REGNUM ||
reg_info.kinds[eRegisterKindDWARF] == LLDB_INVALID_REGNUM) {
if (abi_sp) {
RegisterInfo abi_reg_info;
if (abi_sp->GetRegisterInfoByName(reg_name, abi_reg_info)) {
if (reg_info.kinds[eRegisterKindEHFrame] == LLDB_INVALID_REGNUM &&
abi_reg_info.kinds[eRegisterKindEHFrame] != LLDB_INVALID_REGNUM) {
reg_info.kinds[eRegisterKindEHFrame] =
abi_reg_info.kinds[eRegisterKindEHFrame];
}
if (reg_info.kinds[eRegisterKindDWARF] == LLDB_INVALID_REGNUM &&
abi_reg_info.kinds[eRegisterKindDWARF] != LLDB_INVALID_REGNUM) {
reg_info.kinds[eRegisterKindDWARF] =
abi_reg_info.kinds[eRegisterKindDWARF];
}
if (reg_info.kinds[eRegisterKindGeneric] == LLDB_INVALID_REGNUM &&
abi_reg_info.kinds[eRegisterKindGeneric] != LLDB_INVALID_REGNUM) {
reg_info.kinds[eRegisterKindGeneric] =
abi_reg_info.kinds[eRegisterKindGeneric];
}
}
}
}
}
static size_t SplitCommaSeparatedRegisterNumberString(
const llvm::StringRef &comma_separated_regiter_numbers,
std::vector<uint32_t> &regnums, int base) {
regnums.clear();
std::pair<llvm::StringRef, llvm::StringRef> value_pair;
value_pair.second = comma_separated_regiter_numbers;
do {
value_pair = value_pair.second.split(',');
if (!value_pair.first.empty()) {
uint32_t reg = StringConvert::ToUInt32(value_pair.first.str().c_str(),
LLDB_INVALID_REGNUM, base);
if (reg != LLDB_INVALID_REGNUM)
regnums.push_back(reg);
}
} while (!value_pair.second.empty());
return regnums.size();
}
void ProcessGDBRemote::BuildDynamicRegisterInfo(bool force) {
if (!force && m_register_info.GetNumRegisters() > 0)
return;
m_register_info.Clear();
// Check if qHostInfo specified a specific packet timeout for this
// connection. If so then lets update our setting so the user knows what the
// timeout is and can see it.
const auto host_packet_timeout = m_gdb_comm.GetHostDefaultPacketTimeout();
if (host_packet_timeout > std::chrono::seconds(0)) {
GetGlobalPluginProperties()->SetPacketTimeout(host_packet_timeout.count());
}
// Register info search order:
// 1 - Use the target definition python file if one is specified.
// 2 - If the target definition doesn't have any of the info from the
// target.xml (registers) then proceed to read the target.xml.
// 3 - Fall back on the qRegisterInfo packets.
FileSpec target_definition_fspec =
GetGlobalPluginProperties()->GetTargetDefinitionFile();
if (!FileSystem::Instance().Exists(target_definition_fspec)) {
// If the filename doesn't exist, it may be a ~ not having been expanded -
// try to resolve it.
FileSystem::Instance().Resolve(target_definition_fspec);
}
if (target_definition_fspec) {
// See if we can get register definitions from a python file
if (ParsePythonTargetDefinition(target_definition_fspec)) {
return;
} else {
StreamSP stream_sp = GetTarget().GetDebugger().GetAsyncOutputStream();
stream_sp->Printf("ERROR: target description file %s failed to parse.\n",
target_definition_fspec.GetPath().c_str());
}
}
const ArchSpec &target_arch = GetTarget().GetArchitecture();
const ArchSpec &remote_host_arch = m_gdb_comm.GetHostArchitecture();
const ArchSpec &remote_process_arch = m_gdb_comm.GetProcessArchitecture();
// Use the process' architecture instead of the host arch, if available
ArchSpec arch_to_use;
if (remote_process_arch.IsValid())
arch_to_use = remote_process_arch;
else
arch_to_use = remote_host_arch;
if (!arch_to_use.IsValid())
arch_to_use = target_arch;
if (GetGDBServerRegisterInfo(arch_to_use))
return;
char packet[128];
uint32_t reg_offset = 0;
uint32_t reg_num = 0;
for (StringExtractorGDBRemote::ResponseType response_type =
StringExtractorGDBRemote::eResponse;
response_type == StringExtractorGDBRemote::eResponse; ++reg_num) {
const int packet_len =
::snprintf(packet, sizeof(packet), "qRegisterInfo%x", reg_num);
assert(packet_len < (int)sizeof(packet));
UNUSED_IF_ASSERT_DISABLED(packet_len);
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet, response, false) ==
GDBRemoteCommunication::PacketResult::Success) {
response_type = response.GetResponseType();
if (response_type == StringExtractorGDBRemote::eResponse) {
llvm::StringRef name;
llvm::StringRef value;
ConstString reg_name;
ConstString alt_name;
ConstString set_name;
std::vector<uint32_t> value_regs;
std::vector<uint32_t> invalidate_regs;
std::vector<uint8_t> dwarf_opcode_bytes;
RegisterInfo reg_info = {
NULL, // Name
NULL, // Alt name
0, // byte size
reg_offset, // offset
eEncodingUint, // encoding
eFormatHex, // format
{
LLDB_INVALID_REGNUM, // eh_frame reg num
LLDB_INVALID_REGNUM, // DWARF reg num
LLDB_INVALID_REGNUM, // generic reg num
reg_num, // process plugin reg num
reg_num // native register number
},
NULL,
NULL,
NULL, // Dwarf expression opcode bytes pointer
0 // Dwarf expression opcode bytes length
};
while (response.GetNameColonValue(name, value)) {
if (name.equals("name")) {
reg_name.SetString(value);
} else if (name.equals("alt-name")) {
alt_name.SetString(value);
} else if (name.equals("bitsize")) {
value.getAsInteger(0, reg_info.byte_size);
reg_info.byte_size /= CHAR_BIT;
} else if (name.equals("offset")) {
if (value.getAsInteger(0, reg_offset))
reg_offset = UINT32_MAX;
} else if (name.equals("encoding")) {
const Encoding encoding = Args::StringToEncoding(value);
if (encoding != eEncodingInvalid)
reg_info.encoding = encoding;
} else if (name.equals("format")) {
Format format = eFormatInvalid;
if (OptionArgParser::ToFormat(value.str().c_str(), format, NULL)
.Success())
reg_info.format = format;
else {
reg_info.format =
llvm::StringSwitch<Format>(value)
.Case("binary", eFormatBinary)
.Case("decimal", eFormatDecimal)
.Case("hex", eFormatHex)
.Case("float", eFormatFloat)
.Case("vector-sint8", eFormatVectorOfSInt8)
.Case("vector-uint8", eFormatVectorOfUInt8)
.Case("vector-sint16", eFormatVectorOfSInt16)
.Case("vector-uint16", eFormatVectorOfUInt16)
.Case("vector-sint32", eFormatVectorOfSInt32)
.Case("vector-uint32", eFormatVectorOfUInt32)
.Case("vector-float32", eFormatVectorOfFloat32)
.Case("vector-uint64", eFormatVectorOfUInt64)
.Case("vector-uint128", eFormatVectorOfUInt128)
.Default(eFormatInvalid);
}
} else if (name.equals("set")) {
set_name.SetString(value);
} else if (name.equals("gcc") || name.equals("ehframe")) {
if (value.getAsInteger(0, reg_info.kinds[eRegisterKindEHFrame]))
reg_info.kinds[eRegisterKindEHFrame] = LLDB_INVALID_REGNUM;
} else if (name.equals("dwarf")) {
if (value.getAsInteger(0, reg_info.kinds[eRegisterKindDWARF]))
reg_info.kinds[eRegisterKindDWARF] = LLDB_INVALID_REGNUM;
} else if (name.equals("generic")) {
reg_info.kinds[eRegisterKindGeneric] =
Args::StringToGenericRegister(value);
} else if (name.equals("container-regs")) {
SplitCommaSeparatedRegisterNumberString(value, value_regs, 16);
} else if (name.equals("invalidate-regs")) {
SplitCommaSeparatedRegisterNumberString(value, invalidate_regs, 16);
} else if (name.equals("dynamic_size_dwarf_expr_bytes")) {
size_t dwarf_opcode_len = value.size() / 2;
assert(dwarf_opcode_len > 0);
dwarf_opcode_bytes.resize(dwarf_opcode_len);
reg_info.dynamic_size_dwarf_len = dwarf_opcode_len;
StringExtractor opcode_extractor(value);
uint32_t ret_val =
opcode_extractor.GetHexBytesAvail(dwarf_opcode_bytes);
assert(dwarf_opcode_len == ret_val);
UNUSED_IF_ASSERT_DISABLED(ret_val);
reg_info.dynamic_size_dwarf_expr_bytes = dwarf_opcode_bytes.data();
}
}
reg_info.byte_offset = reg_offset;
assert(reg_info.byte_size != 0);
reg_offset += reg_info.byte_size;
if (!value_regs.empty()) {
value_regs.push_back(LLDB_INVALID_REGNUM);
reg_info.value_regs = value_regs.data();
}
if (!invalidate_regs.empty()) {
invalidate_regs.push_back(LLDB_INVALID_REGNUM);
reg_info.invalidate_regs = invalidate_regs.data();
}
// We have to make a temporary ABI here, and not use the GetABI because
// this code gets called in DidAttach, when the target architecture
// (and consequently the ABI we'll get from the process) may be wrong.
ABISP abi_to_use = ABI::FindPlugin(shared_from_this(), arch_to_use);
AugmentRegisterInfoViaABI(reg_info, reg_name, abi_to_use);
m_register_info.AddRegister(reg_info, reg_name, alt_name, set_name);
} else {
break; // ensure exit before reg_num is incremented
}
} else {
break;
}
}
if (m_register_info.GetNumRegisters() > 0) {
m_register_info.Finalize(GetTarget().GetArchitecture());
return;
}
// We didn't get anything if the accumulated reg_num is zero. See if we are
// debugging ARM and fill with a hard coded register set until we can get an
// updated debugserver down on the devices. On the other hand, if the
// accumulated reg_num is positive, see if we can add composite registers to
// the existing primordial ones.
bool from_scratch = (m_register_info.GetNumRegisters() == 0);
if (!target_arch.IsValid()) {
if (arch_to_use.IsValid() &&
(arch_to_use.GetMachine() == llvm::Triple::arm ||
arch_to_use.GetMachine() == llvm::Triple::thumb) &&
arch_to_use.GetTriple().getVendor() == llvm::Triple::Apple)
m_register_info.HardcodeARMRegisters(from_scratch);
} else if (target_arch.GetMachine() == llvm::Triple::arm ||
target_arch.GetMachine() == llvm::Triple::thumb) {
m_register_info.HardcodeARMRegisters(from_scratch);
}
// At this point, we can finalize our register info.
m_register_info.Finalize(GetTarget().GetArchitecture());
}
Status ProcessGDBRemote::WillLaunch(Module *module) {
return WillLaunchOrAttach();
}
Status ProcessGDBRemote::WillAttachToProcessWithID(lldb::pid_t pid) {
return WillLaunchOrAttach();
}
Status ProcessGDBRemote::WillAttachToProcessWithName(const char *process_name,
bool wait_for_launch) {
return WillLaunchOrAttach();
}
Status ProcessGDBRemote::DoConnectRemote(Stream *strm,
llvm::StringRef remote_url) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
Status error(WillLaunchOrAttach());
if (error.Fail())
return error;
error = ConnectToDebugserver(remote_url);
if (error.Fail())
return error;
StartAsyncThread();
lldb::pid_t pid = m_gdb_comm.GetCurrentProcessID();
if (pid == LLDB_INVALID_PROCESS_ID) {
// We don't have a valid process ID, so note that we are connected and
// could now request to launch or attach, or get remote process listings...
SetPrivateState(eStateConnected);
} else {
// We have a valid process
SetID(pid);
GetThreadList();
StringExtractorGDBRemote response;
if (m_gdb_comm.GetStopReply(response)) {
SetLastStopPacket(response);
// '?' Packets must be handled differently in non-stop mode
if (GetTarget().GetNonStopModeEnabled())
HandleStopReplySequence();
Target &target = GetTarget();
if (!target.GetArchitecture().IsValid()) {
if (m_gdb_comm.GetProcessArchitecture().IsValid()) {
target.SetArchitecture(m_gdb_comm.GetProcessArchitecture());
} else {
if (m_gdb_comm.GetHostArchitecture().IsValid()) {
target.SetArchitecture(m_gdb_comm.GetHostArchitecture());
}
}
}
const StateType state = SetThreadStopInfo(response);
if (state != eStateInvalid) {
SetPrivateState(state);
} else
error.SetErrorStringWithFormat(
"Process %" PRIu64 " was reported after connecting to "
"'%s', but state was not stopped: %s",
pid, remote_url.str().c_str(), StateAsCString(state));
} else
error.SetErrorStringWithFormat("Process %" PRIu64
" was reported after connecting to '%s', "
"but no stop reply packet was received",
pid, remote_url.str().c_str());
}
if (log)
log->Printf("ProcessGDBRemote::%s pid %" PRIu64
": normalizing target architecture initial triple: %s "
"(GetTarget().GetArchitecture().IsValid() %s, "
"m_gdb_comm.GetHostArchitecture().IsValid(): %s)",
__FUNCTION__, GetID(),
GetTarget().GetArchitecture().GetTriple().getTriple().c_str(),
GetTarget().GetArchitecture().IsValid() ? "true" : "false",
m_gdb_comm.GetHostArchitecture().IsValid() ? "true" : "false");
if (error.Success() && !GetTarget().GetArchitecture().IsValid() &&
m_gdb_comm.GetHostArchitecture().IsValid()) {
// Prefer the *process'* architecture over that of the *host*, if
// available.
if (m_gdb_comm.GetProcessArchitecture().IsValid())
GetTarget().SetArchitecture(m_gdb_comm.GetProcessArchitecture());
else
GetTarget().SetArchitecture(m_gdb_comm.GetHostArchitecture());
}
if (log)
log->Printf("ProcessGDBRemote::%s pid %" PRIu64
": normalized target architecture triple: %s",
__FUNCTION__, GetID(),
GetTarget().GetArchitecture().GetTriple().getTriple().c_str());
if (error.Success()) {
PlatformSP platform_sp = GetTarget().GetPlatform();
if (platform_sp && platform_sp->IsConnected())
SetUnixSignals(platform_sp->GetUnixSignals());
else
SetUnixSignals(UnixSignals::Create(GetTarget().GetArchitecture()));
}
return error;
}
Status ProcessGDBRemote::WillLaunchOrAttach() {
Status error;
m_stdio_communication.Clear();
return error;
}
//----------------------------------------------------------------------
// Process Control
//----------------------------------------------------------------------
Status ProcessGDBRemote::DoLaunch(Module *exe_module,
ProcessLaunchInfo &launch_info) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
Status error;
if (log)
log->Printf("ProcessGDBRemote::%s() entered", __FUNCTION__);
uint32_t launch_flags = launch_info.GetFlags().Get();
FileSpec stdin_file_spec{};
FileSpec stdout_file_spec{};
FileSpec stderr_file_spec{};
FileSpec working_dir = launch_info.GetWorkingDirectory();
const FileAction *file_action;
file_action = launch_info.GetFileActionForFD(STDIN_FILENO);
if (file_action) {
if (file_action->GetAction() == FileAction::eFileActionOpen)
stdin_file_spec = file_action->GetFileSpec();
}
file_action = launch_info.GetFileActionForFD(STDOUT_FILENO);
if (file_action) {
if (file_action->GetAction() == FileAction::eFileActionOpen)
stdout_file_spec = file_action->GetFileSpec();
}
file_action = launch_info.GetFileActionForFD(STDERR_FILENO);
if (file_action) {
if (file_action->GetAction() == FileAction::eFileActionOpen)
stderr_file_spec = file_action->GetFileSpec();
}
if (log) {
if (stdin_file_spec || stdout_file_spec || stderr_file_spec)
log->Printf("ProcessGDBRemote::%s provided with STDIO paths via "
"launch_info: stdin=%s, stdout=%s, stderr=%s",
__FUNCTION__,
stdin_file_spec ? stdin_file_spec.GetCString() : "<null>",
stdout_file_spec ? stdout_file_spec.GetCString() : "<null>",
stderr_file_spec ? stderr_file_spec.GetCString() : "<null>");
else
log->Printf("ProcessGDBRemote::%s no STDIO paths given via launch_info",
__FUNCTION__);
}
const bool disable_stdio = (launch_flags & eLaunchFlagDisableSTDIO) != 0;
if (stdin_file_spec || disable_stdio) {
// the inferior will be reading stdin from the specified file or stdio is
// completely disabled
m_stdin_forward = false;
} else {
m_stdin_forward = true;
}
// ::LogSetBitMask (GDBR_LOG_DEFAULT);
// ::LogSetOptions (LLDB_LOG_OPTION_THREADSAFE |
// LLDB_LOG_OPTION_PREPEND_TIMESTAMP |
// LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD);
// ::LogSetLogFile ("/dev/stdout");
ObjectFile *object_file = exe_module->GetObjectFile();
if (object_file) {
error = EstablishConnectionIfNeeded(launch_info);
if (error.Success()) {
PseudoTerminal pty;
const bool disable_stdio = (launch_flags & eLaunchFlagDisableSTDIO) != 0;
PlatformSP platform_sp(GetTarget().GetPlatform());
if (disable_stdio) {
// set to /dev/null unless redirected to a file above
if (!stdin_file_spec)
stdin_file_spec.SetFile(FileSystem::DEV_NULL,
FileSpec::Style::native);
if (!stdout_file_spec)
stdout_file_spec.SetFile(FileSystem::DEV_NULL,
FileSpec::Style::native);
if (!stderr_file_spec)
stderr_file_spec.SetFile(FileSystem::DEV_NULL,
FileSpec::Style::native);
} else if (platform_sp && platform_sp->IsHost()) {
// If the debugserver is local and we aren't disabling STDIO, lets use
// a pseudo terminal to instead of relying on the 'O' packets for stdio
// since 'O' packets can really slow down debugging if the inferior
// does a lot of output.
if ((!stdin_file_spec || !stdout_file_spec || !stderr_file_spec) &&
pty.OpenFirstAvailableMaster(O_RDWR | O_NOCTTY, NULL, 0)) {
FileSpec slave_name{pty.GetSlaveName(NULL, 0)};
if (!stdin_file_spec)
stdin_file_spec = slave_name;
if (!stdout_file_spec)
stdout_file_spec = slave_name;
if (!stderr_file_spec)
stderr_file_spec = slave_name;
}
if (log)
log->Printf(
"ProcessGDBRemote::%s adjusted STDIO paths for local platform "
"(IsHost() is true) using slave: stdin=%s, stdout=%s, stderr=%s",
__FUNCTION__,
stdin_file_spec ? stdin_file_spec.GetCString() : "<null>",
stdout_file_spec ? stdout_file_spec.GetCString() : "<null>",
stderr_file_spec ? stderr_file_spec.GetCString() : "<null>");
}
if (log)
log->Printf("ProcessGDBRemote::%s final STDIO paths after all "
"adjustments: stdin=%s, stdout=%s, stderr=%s",
__FUNCTION__,
stdin_file_spec ? stdin_file_spec.GetCString() : "<null>",
stdout_file_spec ? stdout_file_spec.GetCString() : "<null>",
stderr_file_spec ? stderr_file_spec.GetCString()
: "<null>");
if (stdin_file_spec)
m_gdb_comm.SetSTDIN(stdin_file_spec);
if (stdout_file_spec)
m_gdb_comm.SetSTDOUT(stdout_file_spec);
if (stderr_file_spec)
m_gdb_comm.SetSTDERR(stderr_file_spec);
m_gdb_comm.SetDisableASLR(launch_flags & eLaunchFlagDisableASLR);
m_gdb_comm.SetDetachOnError(launch_flags & eLaunchFlagDetachOnError);
m_gdb_comm.SendLaunchArchPacket(
GetTarget().GetArchitecture().GetArchitectureName());
const char *launch_event_data = launch_info.GetLaunchEventData();
if (launch_event_data != NULL && *launch_event_data != '\0')
m_gdb_comm.SendLaunchEventDataPacket(launch_event_data);
if (working_dir) {
m_gdb_comm.SetWorkingDir(working_dir);
}
// Send the environment and the program + arguments after we connect
m_gdb_comm.SendEnvironment(launch_info.GetEnvironment());
{
// Scope for the scoped timeout object
GDBRemoteCommunication::ScopedTimeout timeout(m_gdb_comm,
std::chrono::seconds(10));
int arg_packet_err = m_gdb_comm.SendArgumentsPacket(launch_info);
if (arg_packet_err == 0) {
std::string error_str;
if (m_gdb_comm.GetLaunchSuccess(error_str)) {
SetID(m_gdb_comm.GetCurrentProcessID());
} else {
error.SetErrorString(error_str.c_str());
}
} else {
error.SetErrorStringWithFormat("'A' packet returned an error: %i",
arg_packet_err);
}
}
if (GetID() == LLDB_INVALID_PROCESS_ID) {
if (log)
log->Printf("failed to connect to debugserver: %s",
error.AsCString());
KillDebugserverProcess();
return error;
}
StringExtractorGDBRemote response;
if (m_gdb_comm.GetStopReply(response)) {
SetLastStopPacket(response);
// '?' Packets must be handled differently in non-stop mode
if (GetTarget().GetNonStopModeEnabled())
HandleStopReplySequence();
const ArchSpec &process_arch = m_gdb_comm.GetProcessArchitecture();
if (process_arch.IsValid()) {
GetTarget().MergeArchitecture(process_arch);
} else {
const ArchSpec &host_arch = m_gdb_comm.GetHostArchitecture();
if (host_arch.IsValid())
GetTarget().MergeArchitecture(host_arch);
}
SetPrivateState(SetThreadStopInfo(response));
if (!disable_stdio) {
if (pty.GetMasterFileDescriptor() != PseudoTerminal::invalid_fd)
SetSTDIOFileDescriptor(pty.ReleaseMasterFileDescriptor());
}
}
} else {
if (log)
log->Printf("failed to connect to debugserver: %s", error.AsCString());
}
} else {
// Set our user ID to an invalid process ID.
SetID(LLDB_INVALID_PROCESS_ID);
error.SetErrorStringWithFormat(
"failed to get object file from '%s' for arch %s",
exe_module->GetFileSpec().GetFilename().AsCString(),
exe_module->GetArchitecture().GetArchitectureName());
}
return error;
}
Status ProcessGDBRemote::ConnectToDebugserver(llvm::StringRef connect_url) {
Status error;
// Only connect if we have a valid connect URL
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (!connect_url.empty()) {
if (log)
log->Printf("ProcessGDBRemote::%s Connecting to %s", __FUNCTION__,
connect_url.str().c_str());
std::unique_ptr<ConnectionFileDescriptor> conn_ap(
new ConnectionFileDescriptor());
if (conn_ap.get()) {
const uint32_t max_retry_count = 50;
uint32_t retry_count = 0;
while (!m_gdb_comm.IsConnected()) {
if (conn_ap->Connect(connect_url, &error) == eConnectionStatusSuccess) {
m_gdb_comm.SetConnection(conn_ap.release());
break;
} else if (error.WasInterrupted()) {
// If we were interrupted, don't keep retrying.
break;
}
retry_count++;
if (retry_count >= max_retry_count)
break;
usleep(100000);
}
}
}
if (!m_gdb_comm.IsConnected()) {
if (error.Success())
error.SetErrorString("not connected to remote gdb server");
return error;
}
// Start the communications read thread so all incoming data can be parsed
// into packets and queued as they arrive.
if (GetTarget().GetNonStopModeEnabled())
m_gdb_comm.StartReadThread();
// We always seem to be able to open a connection to a local port so we need
// to make sure we can then send data to it. If we can't then we aren't
// actually connected to anything, so try and do the handshake with the
// remote GDB server and make sure that goes alright.
if (!m_gdb_comm.HandshakeWithServer(&error)) {
m_gdb_comm.Disconnect();
if (error.Success())
error.SetErrorString("not connected to remote gdb server");
return error;
}
// Send $QNonStop:1 packet on startup if required
if (GetTarget().GetNonStopModeEnabled())
GetTarget().SetNonStopModeEnabled(m_gdb_comm.SetNonStopMode(true));
m_gdb_comm.GetEchoSupported();
m_gdb_comm.GetThreadSuffixSupported();
m_gdb_comm.GetListThreadsInStopReplySupported();
m_gdb_comm.GetHostInfo();
m_gdb_comm.GetVContSupported('c');
m_gdb_comm.GetVAttachOrWaitSupported();
m_gdb_comm.EnableErrorStringInPacket();
// Ask the remote server for the default thread id
if (GetTarget().GetNonStopModeEnabled())
m_gdb_comm.GetDefaultThreadId(m_initial_tid);
size_t num_cmds = GetExtraStartupCommands().GetArgumentCount();
for (size_t idx = 0; idx < num_cmds; idx++) {
StringExtractorGDBRemote response;
m_gdb_comm.SendPacketAndWaitForResponse(
GetExtraStartupCommands().GetArgumentAtIndex(idx), response, false);
}
return error;
}
void ProcessGDBRemote::DidLaunchOrAttach(ArchSpec &process_arch) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::%s()", __FUNCTION__);
if (GetID() != LLDB_INVALID_PROCESS_ID) {
BuildDynamicRegisterInfo(false);
// See if the GDB server supports the qHostInfo information
// See if the GDB server supports the qProcessInfo packet, if so prefer
// that over the Host information as it will be more specific to our
// process.
const ArchSpec &remote_process_arch = m_gdb_comm.GetProcessArchitecture();
if (remote_process_arch.IsValid()) {
process_arch = remote_process_arch;
if (log)
log->Printf("ProcessGDBRemote::%s gdb-remote had process architecture, "
"using %s %s",
__FUNCTION__,
process_arch.GetArchitectureName()
? process_arch.GetArchitectureName()
: "<null>",
process_arch.GetTriple().getTriple().c_str()
? process_arch.GetTriple().getTriple().c_str()
: "<null>");
} else {
process_arch = m_gdb_comm.GetHostArchitecture();
if (log)
log->Printf("ProcessGDBRemote::%s gdb-remote did not have process "
"architecture, using gdb-remote host architecture %s %s",
__FUNCTION__,
process_arch.GetArchitectureName()
? process_arch.GetArchitectureName()
: "<null>",
process_arch.GetTriple().getTriple().c_str()
? process_arch.GetTriple().getTriple().c_str()
: "<null>");
}
if (process_arch.IsValid()) {
const ArchSpec &target_arch = GetTarget().GetArchitecture();
if (target_arch.IsValid()) {
if (log)
log->Printf(
"ProcessGDBRemote::%s analyzing target arch, currently %s %s",
__FUNCTION__,
target_arch.GetArchitectureName()
? target_arch.GetArchitectureName()
: "<null>",
target_arch.GetTriple().getTriple().c_str()
? target_arch.GetTriple().getTriple().c_str()
: "<null>");
// If the remote host is ARM and we have apple as the vendor, then
// ARM executables and shared libraries can have mixed ARM
// architectures.
// You can have an armv6 executable, and if the host is armv7, then the
// system will load the best possible architecture for all shared
// libraries it has, so we really need to take the remote host
// architecture as our defacto architecture in this case.
if ((process_arch.GetMachine() == llvm::Triple::arm ||
process_arch.GetMachine() == llvm::Triple::thumb) &&
process_arch.GetTriple().getVendor() == llvm::Triple::Apple) {
GetTarget().SetArchitecture(process_arch);
if (log)
log->Printf("ProcessGDBRemote::%s remote process is ARM/Apple, "
"setting target arch to %s %s",
__FUNCTION__,
process_arch.GetArchitectureName()
? process_arch.GetArchitectureName()
: "<null>",
process_arch.GetTriple().getTriple().c_str()
? process_arch.GetTriple().getTriple().c_str()
: "<null>");
} else {
// Fill in what is missing in the triple
const llvm::Triple &remote_triple = process_arch.GetTriple();
llvm::Triple new_target_triple = target_arch.GetTriple();
if (new_target_triple.getVendorName().size() == 0) {
new_target_triple.setVendor(remote_triple.getVendor());
if (new_target_triple.getOSName().size() == 0) {
new_target_triple.setOS(remote_triple.getOS());
if (new_target_triple.getEnvironmentName().size() == 0)
new_target_triple.setEnvironment(
remote_triple.getEnvironment());
}
ArchSpec new_target_arch = target_arch;
new_target_arch.SetTriple(new_target_triple);
GetTarget().SetArchitecture(new_target_arch);
}
}
if (log)
log->Printf("ProcessGDBRemote::%s final target arch after "
"adjustments for remote architecture: %s %s",
__FUNCTION__,
target_arch.GetArchitectureName()
? target_arch.GetArchitectureName()
: "<null>",
target_arch.GetTriple().getTriple().c_str()
? target_arch.GetTriple().getTriple().c_str()
: "<null>");
} else {
// The target doesn't have a valid architecture yet, set it from the
// architecture we got from the remote GDB server
GetTarget().SetArchitecture(process_arch);
}
}
// Find out which StructuredDataPlugins are supported by the debug monitor.
// These plugins transmit data over async $J packets.
auto supported_packets_array =
m_gdb_comm.GetSupportedStructuredDataPlugins();
if (supported_packets_array)
MapSupportedStructuredDataPlugins(*supported_packets_array);
}
}
void ProcessGDBRemote::DidLaunch() {
ArchSpec process_arch;
DidLaunchOrAttach(process_arch);
}
Status ProcessGDBRemote::DoAttachToProcessWithID(
lldb::pid_t attach_pid, const ProcessAttachInfo &attach_info) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
Status error;
if (log)
log->Printf("ProcessGDBRemote::%s()", __FUNCTION__);
// Clear out and clean up from any current state
Clear();
if (attach_pid != LLDB_INVALID_PROCESS_ID) {
error = EstablishConnectionIfNeeded(attach_info);
if (error.Success()) {
m_gdb_comm.SetDetachOnError(attach_info.GetDetachOnError());
char packet[64];
const int packet_len =
::snprintf(packet, sizeof(packet), "vAttach;%" PRIx64, attach_pid);
SetID(attach_pid);
m_async_broadcaster.BroadcastEvent(
eBroadcastBitAsyncContinue, new EventDataBytes(packet, packet_len));
} else
SetExitStatus(-1, error.AsCString());
}
return error;
}
Status ProcessGDBRemote::DoAttachToProcessWithName(
const char *process_name, const ProcessAttachInfo &attach_info) {
Status error;
// Clear out and clean up from any current state
Clear();
if (process_name && process_name[0]) {
error = EstablishConnectionIfNeeded(attach_info);
if (error.Success()) {
StreamString packet;
m_gdb_comm.SetDetachOnError(attach_info.GetDetachOnError());
if (attach_info.GetWaitForLaunch()) {
if (!m_gdb_comm.GetVAttachOrWaitSupported()) {
packet.PutCString("vAttachWait");
} else {
if (attach_info.GetIgnoreExisting())
packet.PutCString("vAttachWait");
else
packet.PutCString("vAttachOrWait");
}
} else
packet.PutCString("vAttachName");
packet.PutChar(';');
packet.PutBytesAsRawHex8(process_name, strlen(process_name),
endian::InlHostByteOrder(),
endian::InlHostByteOrder());
m_async_broadcaster.BroadcastEvent(
eBroadcastBitAsyncContinue,
new EventDataBytes(packet.GetString().data(), packet.GetSize()));
} else
SetExitStatus(-1, error.AsCString());
}
return error;
}
lldb::user_id_t ProcessGDBRemote::StartTrace(const TraceOptions &options,
Status &error) {
return m_gdb_comm.SendStartTracePacket(options, error);
}
Status ProcessGDBRemote::StopTrace(lldb::user_id_t uid, lldb::tid_t thread_id) {
return m_gdb_comm.SendStopTracePacket(uid, thread_id);
}
Status ProcessGDBRemote::GetData(lldb::user_id_t uid, lldb::tid_t thread_id,
llvm::MutableArrayRef<uint8_t> &buffer,
size_t offset) {
return m_gdb_comm.SendGetDataPacket(uid, thread_id, buffer, offset);
}
Status ProcessGDBRemote::GetMetaData(lldb::user_id_t uid, lldb::tid_t thread_id,
llvm::MutableArrayRef<uint8_t> &buffer,
size_t offset) {
return m_gdb_comm.SendGetMetaDataPacket(uid, thread_id, buffer, offset);
}
Status ProcessGDBRemote::GetTraceConfig(lldb::user_id_t uid,
TraceOptions &options) {
return m_gdb_comm.SendGetTraceConfigPacket(uid, options);
}
void ProcessGDBRemote::DidExit() {
// When we exit, disconnect from the GDB server communications
m_gdb_comm.Disconnect();
}
void ProcessGDBRemote::DidAttach(ArchSpec &process_arch) {
// If you can figure out what the architecture is, fill it in here.
process_arch.Clear();
DidLaunchOrAttach(process_arch);
}
Status ProcessGDBRemote::WillResume() {
m_continue_c_tids.clear();
m_continue_C_tids.clear();
m_continue_s_tids.clear();
m_continue_S_tids.clear();
m_jstopinfo_sp.reset();
m_jthreadsinfo_sp.reset();
return Status();
}
Status ProcessGDBRemote::DoResume() {
Status error;
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::Resume()");
ListenerSP listener_sp(
Listener::MakeListener("gdb-remote.resume-packet-sent"));
if (listener_sp->StartListeningForEvents(
&m_gdb_comm, GDBRemoteCommunication::eBroadcastBitRunPacketSent)) {
listener_sp->StartListeningForEvents(
&m_async_broadcaster,
ProcessGDBRemote::eBroadcastBitAsyncThreadDidExit);
const size_t num_threads = GetThreadList().GetSize();
StreamString continue_packet;
bool continue_packet_error = false;
if (m_gdb_comm.HasAnyVContSupport()) {
if (!GetTarget().GetNonStopModeEnabled() &&
(m_continue_c_tids.size() == num_threads ||
(m_continue_c_tids.empty() && m_continue_C_tids.empty() &&
m_continue_s_tids.empty() && m_continue_S_tids.empty()))) {
// All threads are continuing, just send a "c" packet
continue_packet.PutCString("c");
} else {
continue_packet.PutCString("vCont");
if (!m_continue_c_tids.empty()) {
if (m_gdb_comm.GetVContSupported('c')) {
for (tid_collection::const_iterator
t_pos = m_continue_c_tids.begin(),
t_end = m_continue_c_tids.end();
t_pos != t_end; ++t_pos)
continue_packet.Printf(";c:%4.4" PRIx64, *t_pos);
} else
continue_packet_error = true;
}
if (!continue_packet_error && !m_continue_C_tids.empty()) {
if (m_gdb_comm.GetVContSupported('C')) {
for (tid_sig_collection::const_iterator
s_pos = m_continue_C_tids.begin(),
s_end = m_continue_C_tids.end();
s_pos != s_end; ++s_pos)
continue_packet.Printf(";C%2.2x:%4.4" PRIx64, s_pos->second,
s_pos->first);
} else
continue_packet_error = true;
}
if (!continue_packet_error && !m_continue_s_tids.empty()) {
if (m_gdb_comm.GetVContSupported('s')) {
for (tid_collection::const_iterator
t_pos = m_continue_s_tids.begin(),
t_end = m_continue_s_tids.end();
t_pos != t_end; ++t_pos)
continue_packet.Printf(";s:%4.4" PRIx64, *t_pos);
} else
continue_packet_error = true;
}
if (!continue_packet_error && !m_continue_S_tids.empty()) {
if (m_gdb_comm.GetVContSupported('S')) {
for (tid_sig_collection::const_iterator
s_pos = m_continue_S_tids.begin(),
s_end = m_continue_S_tids.end();
s_pos != s_end; ++s_pos)
continue_packet.Printf(";S%2.2x:%4.4" PRIx64, s_pos->second,
s_pos->first);
} else
continue_packet_error = true;
}
if (continue_packet_error)
continue_packet.Clear();
}
} else
continue_packet_error = true;
if (continue_packet_error) {
// Either no vCont support, or we tried to use part of the vCont packet
// that wasn't supported by the remote GDB server. We need to try and
// make a simple packet that can do our continue
const size_t num_continue_c_tids = m_continue_c_tids.size();
const size_t num_continue_C_tids = m_continue_C_tids.size();
const size_t num_continue_s_tids = m_continue_s_tids.size();
const size_t num_continue_S_tids = m_continue_S_tids.size();
if (num_continue_c_tids > 0) {
if (num_continue_c_tids == num_threads) {
// All threads are resuming...
m_gdb_comm.SetCurrentThreadForRun(-1);
continue_packet.PutChar('c');
continue_packet_error = false;
} else if (num_continue_c_tids == 1 && num_continue_C_tids == 0 &&
num_continue_s_tids == 0 && num_continue_S_tids == 0) {
// Only one thread is continuing
m_gdb_comm.SetCurrentThreadForRun(m_continue_c_tids.front());
continue_packet.PutChar('c');
continue_packet_error = false;
}
}
if (continue_packet_error && num_continue_C_tids > 0) {
if ((num_continue_C_tids + num_continue_c_tids) == num_threads &&
num_continue_C_tids > 0 && num_continue_s_tids == 0 &&
num_continue_S_tids == 0) {
const int continue_signo = m_continue_C_tids.front().second;
// Only one thread is continuing
if (num_continue_C_tids > 1) {
// More that one thread with a signal, yet we don't have vCont
// support and we are being asked to resume each thread with a
// signal, we need to make sure they are all the same signal, or we
// can't issue the continue accurately with the current support...
if (num_continue_C_tids > 1) {
continue_packet_error = false;
for (size_t i = 1; i < m_continue_C_tids.size(); ++i) {
if (m_continue_C_tids[i].second != continue_signo)
continue_packet_error = true;
}
}
if (!continue_packet_error)
m_gdb_comm.SetCurrentThreadForRun(-1);
} else {
// Set the continue thread ID
continue_packet_error = false;
m_gdb_comm.SetCurrentThreadForRun(m_continue_C_tids.front().first);
}
if (!continue_packet_error) {
// Add threads continuing with the same signo...
continue_packet.Printf("C%2.2x", continue_signo);
}
}
}
if (continue_packet_error && num_continue_s_tids > 0) {
if (num_continue_s_tids == num_threads) {
// All threads are resuming...
m_gdb_comm.SetCurrentThreadForRun(-1);
// If in Non-Stop-Mode use vCont when stepping
if (GetTarget().GetNonStopModeEnabled()) {
if (m_gdb_comm.GetVContSupported('s'))
continue_packet.PutCString("vCont;s");
else
continue_packet.PutChar('s');
} else
continue_packet.PutChar('s');
continue_packet_error = false;
} else if (num_continue_c_tids == 0 && num_continue_C_tids == 0 &&
num_continue_s_tids == 1 && num_continue_S_tids == 0) {
// Only one thread is stepping
m_gdb_comm.SetCurrentThreadForRun(m_continue_s_tids.front());
continue_packet.PutChar('s');
continue_packet_error = false;
}
}
if (!continue_packet_error && num_continue_S_tids > 0) {
if (num_continue_S_tids == num_threads) {
const int step_signo = m_continue_S_tids.front().second;
// Are all threads trying to step with the same signal?
continue_packet_error = false;
if (num_continue_S_tids > 1) {
for (size_t i = 1; i < num_threads; ++i) {
if (m_continue_S_tids[i].second != step_signo)
continue_packet_error = true;
}
}
if (!continue_packet_error) {
// Add threads stepping with the same signo...
m_gdb_comm.SetCurrentThreadForRun(-1);
continue_packet.Printf("S%2.2x", step_signo);
}
} else if (num_continue_c_tids == 0 && num_continue_C_tids == 0 &&
num_continue_s_tids == 0 && num_continue_S_tids == 1) {
// Only one thread is stepping with signal
m_gdb_comm.SetCurrentThreadForRun(m_continue_S_tids.front().first);
continue_packet.Printf("S%2.2x", m_continue_S_tids.front().second);
continue_packet_error = false;
}
}
}
if (continue_packet_error) {
error.SetErrorString("can't make continue packet for this resume");
} else {
EventSP event_sp;
if (!m_async_thread.IsJoinable()) {
error.SetErrorString("Trying to resume but the async thread is dead.");
if (log)
log->Printf("ProcessGDBRemote::DoResume: Trying to resume but the "
"async thread is dead.");
return error;
}
m_async_broadcaster.BroadcastEvent(
eBroadcastBitAsyncContinue,
new EventDataBytes(continue_packet.GetString().data(),
continue_packet.GetSize()));
if (listener_sp->GetEvent(event_sp, std::chrono::seconds(5)) == false) {
error.SetErrorString("Resume timed out.");
if (log)
log->Printf("ProcessGDBRemote::DoResume: Resume timed out.");
} else if (event_sp->BroadcasterIs(&m_async_broadcaster)) {
error.SetErrorString("Broadcast continue, but the async thread was "
"killed before we got an ack back.");
if (log)
log->Printf("ProcessGDBRemote::DoResume: Broadcast continue, but the "
"async thread was killed before we got an ack back.");
return error;
}
}
}
return error;
}
void ProcessGDBRemote::HandleStopReplySequence() {
while (true) {
// Send vStopped
StringExtractorGDBRemote response;
m_gdb_comm.SendPacketAndWaitForResponse("vStopped", response, false);
// OK represents end of signal list
if (response.IsOKResponse())
break;
// If not OK or a normal packet we have a problem
if (!response.IsNormalResponse())
break;
SetLastStopPacket(response);
}
}
void ProcessGDBRemote::ClearThreadIDList() {
std::lock_guard<std::recursive_mutex> guard(m_thread_list_real.GetMutex());
m_thread_ids.clear();
m_thread_pcs.clear();
}
size_t
ProcessGDBRemote::UpdateThreadIDsFromStopReplyThreadsValue(std::string &value) {
m_thread_ids.clear();
size_t comma_pos;
lldb::tid_t tid;
while ((comma_pos = value.find(',')) != std::string::npos) {
value[comma_pos] = '\0';
// thread in big endian hex
tid = StringConvert::ToUInt64(value.c_str(), LLDB_INVALID_THREAD_ID, 16);
if (tid != LLDB_INVALID_THREAD_ID)
m_thread_ids.push_back(tid);
value.erase(0, comma_pos + 1);
}
tid = StringConvert::ToUInt64(value.c_str(), LLDB_INVALID_THREAD_ID, 16);
if (tid != LLDB_INVALID_THREAD_ID)
m_thread_ids.push_back(tid);
return m_thread_ids.size();
}
size_t
ProcessGDBRemote::UpdateThreadPCsFromStopReplyThreadsValue(std::string &value) {
m_thread_pcs.clear();
size_t comma_pos;
lldb::addr_t pc;
while ((comma_pos = value.find(',')) != std::string::npos) {
value[comma_pos] = '\0';
pc = StringConvert::ToUInt64(value.c_str(), LLDB_INVALID_ADDRESS, 16);
if (pc != LLDB_INVALID_ADDRESS)
m_thread_pcs.push_back(pc);
value.erase(0, comma_pos + 1);
}
pc = StringConvert::ToUInt64(value.c_str(), LLDB_INVALID_ADDRESS, 16);
if (pc != LLDB_INVALID_THREAD_ID)
m_thread_pcs.push_back(pc);
return m_thread_pcs.size();
}
bool ProcessGDBRemote::UpdateThreadIDList() {
std::lock_guard<std::recursive_mutex> guard(m_thread_list_real.GetMutex());
if (m_jthreadsinfo_sp) {
// If we have the JSON threads info, we can get the thread list from that
StructuredData::Array *thread_infos = m_jthreadsinfo_sp->GetAsArray();
if (thread_infos && thread_infos->GetSize() > 0) {
m_thread_ids.clear();
m_thread_pcs.clear();
thread_infos->ForEach([this](StructuredData::Object *object) -> bool {
StructuredData::Dictionary *thread_dict = object->GetAsDictionary();
if (thread_dict) {
// Set the thread stop info from the JSON dictionary
SetThreadStopInfo(thread_dict);
lldb::tid_t tid = LLDB_INVALID_THREAD_ID;
if (thread_dict->GetValueForKeyAsInteger<lldb::tid_t>("tid", tid))
m_thread_ids.push_back(tid);
}
return true; // Keep iterating through all thread_info objects
});
}
if (!m_thread_ids.empty())
return true;
} else {
// See if we can get the thread IDs from the current stop reply packets
// that might contain a "threads" key/value pair
// Lock the thread stack while we access it
// Mutex::Locker stop_stack_lock(m_last_stop_packet_mutex);
std::unique_lock<std::recursive_mutex> stop_stack_lock(
m_last_stop_packet_mutex, std::defer_lock);
if (stop_stack_lock.try_lock()) {
// Get the number of stop packets on the stack
int nItems = m_stop_packet_stack.size();
// Iterate over them
for (int i = 0; i < nItems; i++) {
// Get the thread stop info
StringExtractorGDBRemote &stop_info = m_stop_packet_stack[i];
const std::string &stop_info_str = stop_info.GetStringRef();
m_thread_pcs.clear();
const size_t thread_pcs_pos = stop_info_str.find(";thread-pcs:");
if (thread_pcs_pos != std::string::npos) {
const size_t start = thread_pcs_pos + strlen(";thread-pcs:");
const size_t end = stop_info_str.find(';', start);
if (end != std::string::npos) {
std::string value = stop_info_str.substr(start, end - start);
UpdateThreadPCsFromStopReplyThreadsValue(value);
}
}
const size_t threads_pos = stop_info_str.find(";threads:");
if (threads_pos != std::string::npos) {
const size_t start = threads_pos + strlen(";threads:");
const size_t end = stop_info_str.find(';', start);
if (end != std::string::npos) {
std::string value = stop_info_str.substr(start, end - start);
if (UpdateThreadIDsFromStopReplyThreadsValue(value))
return true;
}
}
}
}
}
bool sequence_mutex_unavailable = false;
m_gdb_comm.GetCurrentThreadIDs(m_thread_ids, sequence_mutex_unavailable);
if (sequence_mutex_unavailable) {
return false; // We just didn't get the list
}
return true;
}
bool ProcessGDBRemote::UpdateThreadList(ThreadList &old_thread_list,
ThreadList &new_thread_list) {
// locker will keep a mutex locked until it goes out of scope
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_THREAD));
LLDB_LOGV(log, "pid = {0}", GetID());
size_t num_thread_ids = m_thread_ids.size();
// The "m_thread_ids" thread ID list should always be updated after each stop
// reply packet, but in case it isn't, update it here.
if (num_thread_ids == 0) {
if (!UpdateThreadIDList())
return false;
num_thread_ids = m_thread_ids.size();
}
ThreadList old_thread_list_copy(old_thread_list);
if (num_thread_ids > 0) {
for (size_t i = 0; i < num_thread_ids; ++i) {
tid_t tid = m_thread_ids[i];
ThreadSP thread_sp(
old_thread_list_copy.RemoveThreadByProtocolID(tid, false));
if (!thread_sp) {
thread_sp.reset(new ThreadGDBRemote(*this, tid));
LLDB_LOGV(log, "Making new thread: {0} for thread ID: {1:x}.",
thread_sp.get(), thread_sp->GetID());
} else {
LLDB_LOGV(log, "Found old thread: {0} for thread ID: {1:x}.",
thread_sp.get(), thread_sp->GetID());
}
SetThreadPc(thread_sp, i);
new_thread_list.AddThreadSortedByIndexID(thread_sp);
}
}
// Whatever that is left in old_thread_list_copy are not present in
// new_thread_list. Remove non-existent threads from internal id table.
size_t old_num_thread_ids = old_thread_list_copy.GetSize(false);
for (size_t i = 0; i < old_num_thread_ids; i++) {
ThreadSP old_thread_sp(old_thread_list_copy.GetThreadAtIndex(i, false));
if (old_thread_sp) {
lldb::tid_t old_thread_id = old_thread_sp->GetProtocolID();
m_thread_id_to_index_id_map.erase(old_thread_id);
}
}
return true;
}
void ProcessGDBRemote::SetThreadPc(const ThreadSP &thread_sp, uint64_t index) {
if (m_thread_ids.size() == m_thread_pcs.size() && thread_sp.get() &&
GetByteOrder() != eByteOrderInvalid) {
ThreadGDBRemote *gdb_thread =
static_cast<ThreadGDBRemote *>(thread_sp.get());
RegisterContextSP reg_ctx_sp(thread_sp->GetRegisterContext());
if (reg_ctx_sp) {
uint32_t pc_regnum = reg_ctx_sp->ConvertRegisterKindToRegisterNumber(
eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
if (pc_regnum != LLDB_INVALID_REGNUM) {
gdb_thread->PrivateSetRegisterValue(pc_regnum, m_thread_pcs[index]);
}
}
}
}
bool ProcessGDBRemote::GetThreadStopInfoFromJSON(
ThreadGDBRemote *thread, const StructuredData::ObjectSP &thread_infos_sp) {
// See if we got thread stop infos for all threads via the "jThreadsInfo"
// packet
if (thread_infos_sp) {
StructuredData::Array *thread_infos = thread_infos_sp->GetAsArray();
if (thread_infos) {
lldb::tid_t tid;
const size_t n = thread_infos->GetSize();
for (size_t i = 0; i < n; ++i) {
StructuredData::Dictionary *thread_dict =
thread_infos->GetItemAtIndex(i)->GetAsDictionary();
if (thread_dict) {
if (thread_dict->GetValueForKeyAsInteger<lldb::tid_t>(
"tid", tid, LLDB_INVALID_THREAD_ID)) {
if (tid == thread->GetID())
return (bool)SetThreadStopInfo(thread_dict);
}
}
}
}
}
return false;
}
bool ProcessGDBRemote::CalculateThreadStopInfo(ThreadGDBRemote *thread) {
// See if we got thread stop infos for all threads via the "jThreadsInfo"
// packet
if (GetThreadStopInfoFromJSON(thread, m_jthreadsinfo_sp))
return true;
// See if we got thread stop info for any threads valid stop info reasons
// threads via the "jstopinfo" packet stop reply packet key/value pair?
if (m_jstopinfo_sp) {
// If we have "jstopinfo" then we have stop descriptions for all threads
// that have stop reasons, and if there is no entry for a thread, then it
// has no stop reason.
thread->GetRegisterContext()->InvalidateIfNeeded(true);
if (!GetThreadStopInfoFromJSON(thread, m_jstopinfo_sp)) {
thread->SetStopInfo(StopInfoSP());
}
return true;
}
// Fall back to using the qThreadStopInfo packet
StringExtractorGDBRemote stop_packet;
if (GetGDBRemote().GetThreadStopInfo(thread->GetProtocolID(), stop_packet))
return SetThreadStopInfo(stop_packet) == eStateStopped;
return false;
}
ThreadSP ProcessGDBRemote::SetThreadStopInfo(
lldb::tid_t tid, ExpeditedRegisterMap &expedited_register_map,
uint8_t signo, const std::string &thread_name, const std::string &reason,
const std::string &description, uint32_t exc_type,
const std::vector<addr_t> &exc_data, addr_t thread_dispatch_qaddr,
bool queue_vars_valid, // Set to true if queue_name, queue_kind and
// queue_serial are valid
LazyBool associated_with_dispatch_queue, addr_t dispatch_queue_t,
std::string &queue_name, QueueKind queue_kind, uint64_t queue_serial) {
ThreadSP thread_sp;
if (tid != LLDB_INVALID_THREAD_ID) {
// Scope for "locker" below
{
// m_thread_list_real does have its own mutex, but we need to hold onto
// the mutex between the call to m_thread_list_real.FindThreadByID(...)
// and the m_thread_list_real.AddThread(...) so it doesn't change on us
std::lock_guard<std::recursive_mutex> guard(
m_thread_list_real.GetMutex());
thread_sp = m_thread_list_real.FindThreadByProtocolID(tid, false);
if (!thread_sp) {
// Create the thread if we need to
thread_sp.reset(new ThreadGDBRemote(*this, tid));
m_thread_list_real.AddThread(thread_sp);
}
}
if (thread_sp) {
ThreadGDBRemote *gdb_thread =
static_cast<ThreadGDBRemote *>(thread_sp.get());
gdb_thread->GetRegisterContext()->InvalidateIfNeeded(true);
auto iter = std::find(m_thread_ids.begin(), m_thread_ids.end(), tid);
if (iter != m_thread_ids.end()) {
SetThreadPc(thread_sp, iter - m_thread_ids.begin());
}
for (const auto &pair : expedited_register_map) {
StringExtractor reg_value_extractor;
reg_value_extractor.GetStringRef() = pair.second;
DataBufferSP buffer_sp(new DataBufferHeap(
reg_value_extractor.GetStringRef().size() / 2, 0));
reg_value_extractor.GetHexBytes(buffer_sp->GetData(), '\xcc');
gdb_thread->PrivateSetRegisterValue(pair.first, buffer_sp->GetData());
}
thread_sp->SetName(thread_name.empty() ? NULL : thread_name.c_str());
gdb_thread->SetThreadDispatchQAddr(thread_dispatch_qaddr);
// Check if the GDB server was able to provide the queue name, kind and
// serial number
if (queue_vars_valid)
gdb_thread->SetQueueInfo(std::move(queue_name), queue_kind,
queue_serial, dispatch_queue_t,
associated_with_dispatch_queue);
else
gdb_thread->ClearQueueInfo();
gdb_thread->SetAssociatedWithLibdispatchQueue(
associated_with_dispatch_queue);
if (dispatch_queue_t != LLDB_INVALID_ADDRESS)
gdb_thread->SetQueueLibdispatchQueueAddress(dispatch_queue_t);
// Make sure we update our thread stop reason just once
if (!thread_sp->StopInfoIsUpToDate()) {
thread_sp->SetStopInfo(StopInfoSP());
// If there's a memory thread backed by this thread, we need to use it
// to calculate StopInfo.
if (ThreadSP memory_thread_sp =
m_thread_list.GetBackingThread(thread_sp))
thread_sp = memory_thread_sp;
if (exc_type != 0) {
const size_t exc_data_size = exc_data.size();
thread_sp->SetStopInfo(
StopInfoMachException::CreateStopReasonWithMachException(
*thread_sp, exc_type, exc_data_size,
exc_data_size >= 1 ? exc_data[0] : 0,
exc_data_size >= 2 ? exc_data[1] : 0,
exc_data_size >= 3 ? exc_data[2] : 0));
} else {
bool handled = false;
bool did_exec = false;
if (!reason.empty()) {
if (reason.compare("trace") == 0) {
addr_t pc = thread_sp->GetRegisterContext()->GetPC();
lldb::BreakpointSiteSP bp_site_sp = thread_sp->GetProcess()
->GetBreakpointSiteList()
.FindByAddress(pc);
// If the current pc is a breakpoint site then the StopInfo
// should be set to Breakpoint Otherwise, it will be set to
// Trace.
if (bp_site_sp &&
bp_site_sp->ValidForThisThread(thread_sp.get())) {
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonWithBreakpointSiteID(
*thread_sp, bp_site_sp->GetID()));
} else
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonToTrace(*thread_sp));
handled = true;
} else if (reason.compare("breakpoint") == 0) {
addr_t pc = thread_sp->GetRegisterContext()->GetPC();
lldb::BreakpointSiteSP bp_site_sp = thread_sp->GetProcess()
->GetBreakpointSiteList()
.FindByAddress(pc);
if (bp_site_sp) {
// If the breakpoint is for this thread, then we'll report the
// hit, but if it is for another thread, we can just report no
// reason. We don't need to worry about stepping over the
// breakpoint here, that will be taken care of when the thread
// resumes and notices that there's a breakpoint under the pc.
handled = true;
if (bp_site_sp->ValidForThisThread(thread_sp.get())) {
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonWithBreakpointSiteID(
*thread_sp, bp_site_sp->GetID()));
} else {
StopInfoSP invalid_stop_info_sp;
thread_sp->SetStopInfo(invalid_stop_info_sp);
}
}
} else if (reason.compare("trap") == 0) {
// Let the trap just use the standard signal stop reason below...
} else if (reason.compare("watchpoint") == 0) {
StringExtractor desc_extractor(description.c_str());
addr_t wp_addr = desc_extractor.GetU64(LLDB_INVALID_ADDRESS);
uint32_t wp_index = desc_extractor.GetU32(LLDB_INVALID_INDEX32);
addr_t wp_hit_addr = desc_extractor.GetU64(LLDB_INVALID_ADDRESS);
watch_id_t watch_id = LLDB_INVALID_WATCH_ID;
if (wp_addr != LLDB_INVALID_ADDRESS) {
WatchpointSP wp_sp;
ArchSpec::Core core = GetTarget().GetArchitecture().GetCore();
if ((core >= ArchSpec::kCore_mips_first &&
core <= ArchSpec::kCore_mips_last) ||
(core >= ArchSpec::eCore_arm_generic &&
core <= ArchSpec::eCore_arm_aarch64))
wp_sp = GetTarget().GetWatchpointList().FindByAddress(
wp_hit_addr);
if (!wp_sp)
wp_sp =
GetTarget().GetWatchpointList().FindByAddress(wp_addr);
if (wp_sp) {
wp_sp->SetHardwareIndex(wp_index);
watch_id = wp_sp->GetID();
}
}
if (watch_id == LLDB_INVALID_WATCH_ID) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(
GDBR_LOG_WATCHPOINTS));
if (log)
log->Printf("failed to find watchpoint");
}
thread_sp->SetStopInfo(StopInfo::CreateStopReasonWithWatchpointID(
*thread_sp, watch_id, wp_hit_addr));
handled = true;
} else if (reason.compare("exception") == 0) {
thread_sp->SetStopInfo(StopInfo::CreateStopReasonWithException(
*thread_sp, description.c_str()));
handled = true;
} else if (reason.compare("exec") == 0) {
did_exec = true;
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonWithExec(*thread_sp));
handled = true;
}
} else if (!signo) {
addr_t pc = thread_sp->GetRegisterContext()->GetPC();
lldb::BreakpointSiteSP bp_site_sp =
thread_sp->GetProcess()->GetBreakpointSiteList().FindByAddress(
pc);
// If the current pc is a breakpoint site then the StopInfo should
// be set to Breakpoint even though the remote stub did not set it
// as such. This can happen when the thread is involuntarily
// interrupted (e.g. due to stops on other threads) just as it is
// about to execute the breakpoint instruction.
if (bp_site_sp && bp_site_sp->ValidForThisThread(thread_sp.get())) {
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonWithBreakpointSiteID(
*thread_sp, bp_site_sp->GetID()));
handled = true;
}
}
if (!handled && signo && did_exec == false) {
if (signo == SIGTRAP) {
// Currently we are going to assume SIGTRAP means we are either
// hitting a breakpoint or hardware single stepping.
handled = true;
addr_t pc = thread_sp->GetRegisterContext()->GetPC() +
m_breakpoint_pc_offset;
lldb::BreakpointSiteSP bp_site_sp = thread_sp->GetProcess()
->GetBreakpointSiteList()
.FindByAddress(pc);
if (bp_site_sp) {
// If the breakpoint is for this thread, then we'll report the
// hit, but if it is for another thread, we can just report no
// reason. We don't need to worry about stepping over the
// breakpoint here, that will be taken care of when the thread
// resumes and notices that there's a breakpoint under the pc.
if (bp_site_sp->ValidForThisThread(thread_sp.get())) {
if (m_breakpoint_pc_offset != 0)
thread_sp->GetRegisterContext()->SetPC(pc);
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonWithBreakpointSiteID(
*thread_sp, bp_site_sp->GetID()));
} else {
StopInfoSP invalid_stop_info_sp;
thread_sp->SetStopInfo(invalid_stop_info_sp);
}
} else {
// If we were stepping then assume the stop was the result of
// the trace. If we were not stepping then report the SIGTRAP.
// FIXME: We are still missing the case where we single step
// over a trap instruction.
if (thread_sp->GetTemporaryResumeState() == eStateStepping)
thread_sp->SetStopInfo(
StopInfo::CreateStopReasonToTrace(*thread_sp));
else
thread_sp->SetStopInfo(StopInfo::CreateStopReasonWithSignal(
*thread_sp, signo, description.c_str()));
}
}
if (!handled)
thread_sp->SetStopInfo(StopInfo::CreateStopReasonWithSignal(
*thread_sp, signo, description.c_str()));
}
if (!description.empty()) {
lldb::StopInfoSP stop_info_sp(thread_sp->GetStopInfo());
if (stop_info_sp) {
const char *stop_info_desc = stop_info_sp->GetDescription();
if (!stop_info_desc || !stop_info_desc[0])
stop_info_sp->SetDescription(description.c_str());
} else {
thread_sp->SetStopInfo(StopInfo::CreateStopReasonWithException(
*thread_sp, description.c_str()));
}
}
}
}
}
}
return thread_sp;
}
lldb::ThreadSP
ProcessGDBRemote::SetThreadStopInfo(StructuredData::Dictionary *thread_dict) {
static ConstString g_key_tid("tid");
static ConstString g_key_name("name");
static ConstString g_key_reason("reason");
static ConstString g_key_metype("metype");
static ConstString g_key_medata("medata");
static ConstString g_key_qaddr("qaddr");
static ConstString g_key_dispatch_queue_t("dispatch_queue_t");
static ConstString g_key_associated_with_dispatch_queue(
"associated_with_dispatch_queue");
static ConstString g_key_queue_name("qname");
static ConstString g_key_queue_kind("qkind");
static ConstString g_key_queue_serial_number("qserialnum");
static ConstString g_key_registers("registers");
static ConstString g_key_memory("memory");
static ConstString g_key_address("address");
static ConstString g_key_bytes("bytes");
static ConstString g_key_description("description");
static ConstString g_key_signal("signal");
// Stop with signal and thread info
lldb::tid_t tid = LLDB_INVALID_THREAD_ID;
uint8_t signo = 0;
std::string value;
std::string thread_name;
std::string reason;
std::string description;
uint32_t exc_type = 0;
std::vector<addr_t> exc_data;
addr_t thread_dispatch_qaddr = LLDB_INVALID_ADDRESS;
ExpeditedRegisterMap expedited_register_map;
bool queue_vars_valid = false;
addr_t dispatch_queue_t = LLDB_INVALID_ADDRESS;
LazyBool associated_with_dispatch_queue = eLazyBoolCalculate;
std::string queue_name;
QueueKind queue_kind = eQueueKindUnknown;
uint64_t queue_serial_number = 0;
// Iterate through all of the thread dictionary key/value pairs from the
// structured data dictionary
thread_dict->ForEach([this, &tid, &expedited_register_map, &thread_name,
&signo, &reason, &description, &exc_type, &exc_data,
&thread_dispatch_qaddr, &queue_vars_valid,
&associated_with_dispatch_queue, &dispatch_queue_t,
&queue_name, &queue_kind, &queue_serial_number](
ConstString key,
StructuredData::Object *object) -> bool {
if (key == g_key_tid) {
// thread in big endian hex
tid = object->GetIntegerValue(LLDB_INVALID_THREAD_ID);
} else if (key == g_key_metype) {
// exception type in big endian hex
exc_type = object->GetIntegerValue(0);
} else if (key == g_key_medata) {
// exception data in big endian hex
StructuredData::Array *array = object->GetAsArray();
if (array) {
array->ForEach([&exc_data](StructuredData::Object *object) -> bool {
exc_data.push_back(object->GetIntegerValue());
return true; // Keep iterating through all array items
});
}
} else if (key == g_key_name) {
thread_name = object->GetStringValue();
} else if (key == g_key_qaddr) {
thread_dispatch_qaddr = object->GetIntegerValue(LLDB_INVALID_ADDRESS);
} else if (key == g_key_queue_name) {
queue_vars_valid = true;
queue_name = object->GetStringValue();
} else if (key == g_key_queue_kind) {
std::string queue_kind_str = object->GetStringValue();
if (queue_kind_str == "serial") {
queue_vars_valid = true;
queue_kind = eQueueKindSerial;
} else if (queue_kind_str == "concurrent") {
queue_vars_valid = true;
queue_kind = eQueueKindConcurrent;
}
} else if (key == g_key_queue_serial_number) {
queue_serial_number = object->GetIntegerValue(0);
if (queue_serial_number != 0)
queue_vars_valid = true;
} else if (key == g_key_dispatch_queue_t) {
dispatch_queue_t = object->GetIntegerValue(0);
if (dispatch_queue_t != 0 && dispatch_queue_t != LLDB_INVALID_ADDRESS)
queue_vars_valid = true;
} else if (key == g_key_associated_with_dispatch_queue) {
queue_vars_valid = true;
bool associated = object->GetBooleanValue();
if (associated)
associated_with_dispatch_queue = eLazyBoolYes;
else
associated_with_dispatch_queue = eLazyBoolNo;
} else if (key == g_key_reason) {
reason = object->GetStringValue();
} else if (key == g_key_description) {
description = object->GetStringValue();
} else if (key == g_key_registers) {
StructuredData::Dictionary *registers_dict = object->GetAsDictionary();
if (registers_dict) {
registers_dict->ForEach(
[&expedited_register_map](ConstString key,
StructuredData::Object *object) -> bool {
const uint32_t reg =
StringConvert::ToUInt32(key.GetCString(), UINT32_MAX, 10);
if (reg != UINT32_MAX)
expedited_register_map[reg] = object->GetStringValue();
return true; // Keep iterating through all array items
});
}
} else if (key == g_key_memory) {
StructuredData::Array *array = object->GetAsArray();
if (array) {
array->ForEach([this](StructuredData::Object *object) -> bool {
StructuredData::Dictionary *mem_cache_dict =
object->GetAsDictionary();
if (mem_cache_dict) {
lldb::addr_t mem_cache_addr = LLDB_INVALID_ADDRESS;
if (mem_cache_dict->GetValueForKeyAsInteger<lldb::addr_t>(
"address", mem_cache_addr)) {
if (mem_cache_addr != LLDB_INVALID_ADDRESS) {
llvm::StringRef str;
if (mem_cache_dict->GetValueForKeyAsString("bytes", str)) {
StringExtractor bytes(str);
bytes.SetFilePos(0);
const size_t byte_size = bytes.GetStringRef().size() / 2;
DataBufferSP data_buffer_sp(new DataBufferHeap(byte_size, 0));
const size_t bytes_copied =
bytes.GetHexBytes(data_buffer_sp->GetData(), 0);
if (bytes_copied == byte_size)
m_memory_cache.AddL1CacheData(mem_cache_addr,
data_buffer_sp);
}
}
}
}
return true; // Keep iterating through all array items
});
}
} else if (key == g_key_signal)
signo = object->GetIntegerValue(LLDB_INVALID_SIGNAL_NUMBER);
return true; // Keep iterating through all dictionary key/value pairs
});
return SetThreadStopInfo(tid, expedited_register_map, signo, thread_name,
reason, description, exc_type, exc_data,
thread_dispatch_qaddr, queue_vars_valid,
associated_with_dispatch_queue, dispatch_queue_t,
queue_name, queue_kind, queue_serial_number);
}
StateType ProcessGDBRemote::SetThreadStopInfo(StringExtractor &stop_packet) {
stop_packet.SetFilePos(0);
const char stop_type = stop_packet.GetChar();
switch (stop_type) {
case 'T':
case 'S': {
// This is a bit of a hack, but is is required. If we did exec, we need to
// clear our thread lists and also know to rebuild our dynamic register
// info before we lookup and threads and populate the expedited register
// values so we need to know this right away so we can cleanup and update
// our registers.
const uint32_t stop_id = GetStopID();
if (stop_id == 0) {
// Our first stop, make sure we have a process ID, and also make sure we
// know about our registers
if (GetID() == LLDB_INVALID_PROCESS_ID) {
lldb::pid_t pid = m_gdb_comm.GetCurrentProcessID();
if (pid != LLDB_INVALID_PROCESS_ID)
SetID(pid);
}
BuildDynamicRegisterInfo(true);
}
// Stop with signal and thread info
lldb::tid_t tid = LLDB_INVALID_THREAD_ID;
const uint8_t signo = stop_packet.GetHexU8();
llvm::StringRef key;
llvm::StringRef value;
std::string thread_name;
std::string reason;
std::string description;
uint32_t exc_type = 0;
std::vector<addr_t> exc_data;
addr_t thread_dispatch_qaddr = LLDB_INVALID_ADDRESS;
bool queue_vars_valid =
false; // says if locals below that start with "queue_" are valid
addr_t dispatch_queue_t = LLDB_INVALID_ADDRESS;
LazyBool associated_with_dispatch_queue = eLazyBoolCalculate;
std::string queue_name;
QueueKind queue_kind = eQueueKindUnknown;
uint64_t queue_serial_number = 0;
ExpeditedRegisterMap expedited_register_map;
while (stop_packet.GetNameColonValue(key, value)) {
if (key.compare("metype") == 0) {
// exception type in big endian hex
value.getAsInteger(16, exc_type);
} else if (key.compare("medata") == 0) {
// exception data in big endian hex
uint64_t x;
value.getAsInteger(16, x);
exc_data.push_back(x);
} else if (key.compare("thread") == 0) {
// thread in big endian hex
if (value.getAsInteger(16, tid))
tid = LLDB_INVALID_THREAD_ID;
} else if (key.compare("threads") == 0) {
std::lock_guard<std::recursive_mutex> guard(
m_thread_list_real.GetMutex());
m_thread_ids.clear();
// A comma separated list of all threads in the current
// process that includes the thread for this stop reply packet
lldb::tid_t tid;
while (!value.empty()) {
llvm::StringRef tid_str;
std::tie(tid_str, value) = value.split(',');
if (tid_str.getAsInteger(16, tid))
tid = LLDB_INVALID_THREAD_ID;
m_thread_ids.push_back(tid);
}
} else if (key.compare("thread-pcs") == 0) {
m_thread_pcs.clear();
// A comma separated list of all threads in the current
// process that includes the thread for this stop reply packet
lldb::addr_t pc;
while (!value.empty()) {
llvm::StringRef pc_str;
std::tie(pc_str, value) = value.split(',');
if (pc_str.getAsInteger(16, pc))
pc = LLDB_INVALID_ADDRESS;
m_thread_pcs.push_back(pc);
}
} else if (key.compare("jstopinfo") == 0) {
StringExtractor json_extractor(value);
std::string json;
// Now convert the HEX bytes into a string value
json_extractor.GetHexByteString(json);
// This JSON contains thread IDs and thread stop info for all threads.
// It doesn't contain expedited registers, memory or queue info.
m_jstopinfo_sp = StructuredData::ParseJSON(json);
} else if (key.compare("hexname") == 0) {
StringExtractor name_extractor(value);
std::string name;
// Now convert the HEX bytes into a string value
name_extractor.GetHexByteString(thread_name);
} else if (key.compare("name") == 0) {
thread_name = value;
} else if (key.compare("qaddr") == 0) {
value.getAsInteger(16, thread_dispatch_qaddr);
} else if (key.compare("dispatch_queue_t") == 0) {
queue_vars_valid = true;
value.getAsInteger(16, dispatch_queue_t);
} else if (key.compare("qname") == 0) {
queue_vars_valid = true;
StringExtractor name_extractor(value);
// Now convert the HEX bytes into a string value
name_extractor.GetHexByteString(queue_name);
} else if (key.compare("qkind") == 0) {
queue_kind = llvm::StringSwitch<QueueKind>(value)
.Case("serial", eQueueKindSerial)
.Case("concurrent", eQueueKindConcurrent)
.Default(eQueueKindUnknown);
queue_vars_valid = queue_kind != eQueueKindUnknown;
} else if (key.compare("qserialnum") == 0) {
if (!value.getAsInteger(0, queue_serial_number))
queue_vars_valid = true;
} else if (key.compare("reason") == 0) {
reason = value;
} else if (key.compare("description") == 0) {
StringExtractor desc_extractor(value);
// Now convert the HEX bytes into a string value
desc_extractor.GetHexByteString(description);
} else if (key.compare("memory") == 0) {
// Expedited memory. GDB servers can choose to send back expedited
// memory that can populate the L1 memory cache in the process so that
// things like the frame pointer backchain can be expedited. This will
// help stack backtracing be more efficient by not having to send as
// many memory read requests down the remote GDB server.
// Key/value pair format: memory:<addr>=<bytes>;
// <addr> is a number whose base will be interpreted by the prefix:
// "0x[0-9a-fA-F]+" for hex
// "0[0-7]+" for octal
// "[1-9]+" for decimal
// <bytes> is native endian ASCII hex bytes just like the register
// values
llvm::StringRef addr_str, bytes_str;
std::tie(addr_str, bytes_str) = value.split('=');
if (!addr_str.empty() && !bytes_str.empty()) {
lldb::addr_t mem_cache_addr = LLDB_INVALID_ADDRESS;
if (!addr_str.getAsInteger(0, mem_cache_addr)) {
StringExtractor bytes(bytes_str);
const size_t byte_size = bytes.GetBytesLeft() / 2;
DataBufferSP data_buffer_sp(new DataBufferHeap(byte_size, 0));
const size_t bytes_copied =
bytes.GetHexBytes(data_buffer_sp->GetData(), 0);
if (bytes_copied == byte_size)
m_memory_cache.AddL1CacheData(mem_cache_addr, data_buffer_sp);
}
}
} else if (key.compare("watch") == 0 || key.compare("rwatch") == 0 ||
key.compare("awatch") == 0) {
// Support standard GDB remote stop reply packet 'TAAwatch:addr'
lldb::addr_t wp_addr = LLDB_INVALID_ADDRESS;
value.getAsInteger(16, wp_addr);
WatchpointSP wp_sp =
GetTarget().GetWatchpointList().FindByAddress(wp_addr);
uint32_t wp_index = LLDB_INVALID_INDEX32;
if (wp_sp)
wp_index = wp_sp->GetHardwareIndex();
reason = "watchpoint";
StreamString ostr;
ostr.Printf("%" PRIu64 " %" PRIu32, wp_addr, wp_index);
description = ostr.GetString();
} else if (key.compare("library") == 0) {
LoadModules();
} else if (key.size() == 2 && ::isxdigit(key[0]) && ::isxdigit(key[1])) {
uint32_t reg = UINT32_MAX;
if (!key.getAsInteger(16, reg))
expedited_register_map[reg] = std::move(value);
}
}
if (tid == LLDB_INVALID_THREAD_ID) {
// A thread id may be invalid if the response is old style 'S' packet
// which does not provide the
// thread information. So update the thread list and choose the first
// one.
UpdateThreadIDList();
if (!m_thread_ids.empty()) {
tid = m_thread_ids.front();
}
}
ThreadSP thread_sp = SetThreadStopInfo(
tid, expedited_register_map, signo, thread_name, reason, description,
exc_type, exc_data, thread_dispatch_qaddr, queue_vars_valid,
associated_with_dispatch_queue, dispatch_queue_t, queue_name,
queue_kind, queue_serial_number);
return eStateStopped;
} break;
case 'W':
case 'X':
// process exited
return eStateExited;
default:
break;
}
return eStateInvalid;
}
void ProcessGDBRemote::RefreshStateAfterStop() {
std::lock_guard<std::recursive_mutex> guard(m_thread_list_real.GetMutex());
m_thread_ids.clear();
m_thread_pcs.clear();
// Set the thread stop info. It might have a "threads" key whose value is a
// list of all thread IDs in the current process, so m_thread_ids might get
// set.
// Scope for the lock
{
// Lock the thread stack while we access it
std::lock_guard<std::recursive_mutex> guard(m_last_stop_packet_mutex);
// Get the number of stop packets on the stack
int nItems = m_stop_packet_stack.size();
// Iterate over them
for (int i = 0; i < nItems; i++) {
// Get the thread stop info
StringExtractorGDBRemote stop_info = m_stop_packet_stack[i];
// Process thread stop info
SetThreadStopInfo(stop_info);
}
// Clear the thread stop stack
m_stop_packet_stack.clear();
}
// Check to see if SetThreadStopInfo() filled in m_thread_ids?
if (m_thread_ids.empty()) {
// No, we need to fetch the thread list manually
UpdateThreadIDList();
}
// If we have queried for a default thread id
if (m_initial_tid != LLDB_INVALID_THREAD_ID) {
m_thread_list.SetSelectedThreadByID(m_initial_tid);
m_initial_tid = LLDB_INVALID_THREAD_ID;
}
// Let all threads recover from stopping and do any clean up based on the
// previous thread state (if any).
m_thread_list_real.RefreshStateAfterStop();
}
Status ProcessGDBRemote::DoHalt(bool &caused_stop) {
Status error;
if (m_public_state.GetValue() == eStateAttaching) {
// We are being asked to halt during an attach. We need to just close our
// file handle and debugserver will go away, and we can be done...
m_gdb_comm.Disconnect();
} else
caused_stop = m_gdb_comm.Interrupt();
return error;
}
Status ProcessGDBRemote::DoDetach(bool keep_stopped) {
Status error;
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::DoDetach(keep_stopped: %i)", keep_stopped);
error = m_gdb_comm.Detach(keep_stopped);
if (log) {
if (error.Success())
log->PutCString(
"ProcessGDBRemote::DoDetach() detach packet sent successfully");
else
log->Printf("ProcessGDBRemote::DoDetach() detach packet send failed: %s",
error.AsCString() ? error.AsCString() : "<unknown error>");
}
if (!error.Success())
return error;
// Sleep for one second to let the process get all detached...
StopAsyncThread();
SetPrivateState(eStateDetached);
ResumePrivateStateThread();
// KillDebugserverProcess ();
return error;
}
Status ProcessGDBRemote::DoDestroy() {
Status error;
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::DoDestroy()");
// There is a bug in older iOS debugservers where they don't shut down the
// process they are debugging properly. If the process is sitting at a
// breakpoint or an exception, this can cause problems with restarting. So
// we check to see if any of our threads are stopped at a breakpoint, and if
// so we remove all the breakpoints, resume the process, and THEN destroy it
// again.
//
// Note, we don't have a good way to test the version of debugserver, but I
// happen to know that the set of all the iOS debugservers which don't
// support GetThreadSuffixSupported() and that of the debugservers with this
// bug are equal. There really should be a better way to test this!
//
// We also use m_destroy_tried_resuming to make sure we only do this once, if
// we resume and then halt and get called here to destroy again and we're
// still at a breakpoint or exception, then we should just do the straight-
// forward kill.
//
// And of course, if we weren't able to stop the process by the time we get
// here, it isn't necessary (or helpful) to do any of this.
if (!m_gdb_comm.GetThreadSuffixSupported() &&
m_public_state.GetValue() != eStateRunning) {
PlatformSP platform_sp = GetTarget().GetPlatform();
// FIXME: These should be ConstStrings so we aren't doing strcmp'ing.
if (platform_sp && platform_sp->GetName() &&
platform_sp->GetName() == PlatformRemoteiOS::GetPluginNameStatic()) {
if (m_destroy_tried_resuming) {
if (log)
log->PutCString("ProcessGDBRemote::DoDestroy() - Tried resuming to "
"destroy once already, not doing it again.");
} else {
// At present, the plans are discarded and the breakpoints disabled
// Process::Destroy, but we really need it to happen here and it
// doesn't matter if we do it twice.
m_thread_list.DiscardThreadPlans();
DisableAllBreakpointSites();
bool stop_looks_like_crash = false;
ThreadList &threads = GetThreadList();
{
std::lock_guard<std::recursive_mutex> guard(threads.GetMutex());
size_t num_threads = threads.GetSize();
for (size_t i = 0; i < num_threads; i++) {
ThreadSP thread_sp = threads.GetThreadAtIndex(i);
StopInfoSP stop_info_sp = thread_sp->GetPrivateStopInfo();
StopReason reason = eStopReasonInvalid;
if (stop_info_sp)
reason = stop_info_sp->GetStopReason();
if (reason == eStopReasonBreakpoint ||
reason == eStopReasonException) {
if (log)
log->Printf(
"ProcessGDBRemote::DoDestroy() - thread: 0x%4.4" PRIx64
" stopped with reason: %s.",
thread_sp->GetProtocolID(), stop_info_sp->GetDescription());
stop_looks_like_crash = true;
break;
}
}
}
if (stop_looks_like_crash) {
if (log)
log->PutCString("ProcessGDBRemote::DoDestroy() - Stopped at a "
"breakpoint, continue and then kill.");
m_destroy_tried_resuming = true;
// If we are going to run again before killing, it would be good to
// suspend all the threads before resuming so they won't get into
// more trouble. Sadly, for the threads stopped with the breakpoint
// or exception, the exception doesn't get cleared if it is
// suspended, so we do have to run the risk of letting those threads
// proceed a bit.
{
std::lock_guard<std::recursive_mutex> guard(threads.GetMutex());
size_t num_threads = threads.GetSize();
for (size_t i = 0; i < num_threads; i++) {
ThreadSP thread_sp = threads.GetThreadAtIndex(i);
StopInfoSP stop_info_sp = thread_sp->GetPrivateStopInfo();
StopReason reason = eStopReasonInvalid;
if (stop_info_sp)
reason = stop_info_sp->GetStopReason();
if (reason != eStopReasonBreakpoint &&
reason != eStopReasonException) {
if (log)
log->Printf("ProcessGDBRemote::DoDestroy() - Suspending "
"thread: 0x%4.4" PRIx64 " before running.",
thread_sp->GetProtocolID());
thread_sp->SetResumeState(eStateSuspended);
}
}
}
Resume();
return Destroy(false);
}
}
}
}
// Interrupt if our inferior is running...
int exit_status = SIGABRT;
std::string exit_string;
if (m_gdb_comm.IsConnected()) {
if (m_public_state.GetValue() != eStateAttaching) {
StringExtractorGDBRemote response;
bool send_async = true;
GDBRemoteCommunication::ScopedTimeout(m_gdb_comm,
std::chrono::seconds(3));
if (m_gdb_comm.SendPacketAndWaitForResponse("k", response, send_async) ==
GDBRemoteCommunication::PacketResult::Success) {
char packet_cmd = response.GetChar(0);
if (packet_cmd == 'W' || packet_cmd == 'X') {
#if defined(__APPLE__)
// For Native processes on Mac OS X, we launch through the Host
// Platform, then hand the process off to debugserver, which becomes
// the parent process through "PT_ATTACH". Then when we go to kill
// the process on Mac OS X we call ptrace(PT_KILL) to kill it, then
// we call waitpid which returns with no error and the correct
// status. But amusingly enough that doesn't seem to actually reap
// the process, but instead it is left around as a Zombie. Probably
// the kernel is in the process of switching ownership back to lldb
// which was the original parent, and gets confused in the handoff.
// Anyway, so call waitpid here to finally reap it.
PlatformSP platform_sp(GetTarget().GetPlatform());
if (platform_sp && platform_sp->IsHost()) {
int status;
::pid_t reap_pid;
reap_pid = waitpid(GetID(), &status, WNOHANG);
if (log)
log->Printf("Reaped pid: %d, status: %d.\n", reap_pid, status);
}
#endif
SetLastStopPacket(response);
ClearThreadIDList();
exit_status = response.GetHexU8();
} else {
if (log)
log->Printf("ProcessGDBRemote::DoDestroy - got unexpected response "
"to k packet: %s",
response.GetStringRef().c_str());
exit_string.assign("got unexpected response to k packet: ");
exit_string.append(response.GetStringRef());
}
} else {
if (log)
log->Printf("ProcessGDBRemote::DoDestroy - failed to send k packet");
exit_string.assign("failed to send the k packet");
}
} else {
if (log)
log->Printf("ProcessGDBRemote::DoDestroy - killed or interrupted while "
"attaching");
exit_string.assign("killed or interrupted while attaching.");
}
} else {
// If we missed setting the exit status on the way out, do it here.
// NB set exit status can be called multiple times, the first one sets the
// status.
exit_string.assign("destroying when not connected to debugserver");
}
SetExitStatus(exit_status, exit_string.c_str());
StopAsyncThread();
KillDebugserverProcess();
return error;
}
void ProcessGDBRemote::SetLastStopPacket(
const StringExtractorGDBRemote &response) {
const bool did_exec =
response.GetStringRef().find(";reason:exec;") != std::string::npos;
if (did_exec) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::SetLastStopPacket () - detected exec");
m_thread_list_real.Clear();
m_thread_list.Clear();
BuildDynamicRegisterInfo(true);
m_gdb_comm.ResetDiscoverableSettings(did_exec);
}
// Scope the lock
{
// Lock the thread stack while we access it
std::lock_guard<std::recursive_mutex> guard(m_last_stop_packet_mutex);
// We are are not using non-stop mode, there can only be one last stop
// reply packet, so clear the list.
if (GetTarget().GetNonStopModeEnabled() == false)
m_stop_packet_stack.clear();
// Add this stop packet to the stop packet stack This stack will get popped
// and examined when we switch to the Stopped state
m_stop_packet_stack.push_back(response);
}
}
void ProcessGDBRemote::SetUnixSignals(const UnixSignalsSP &signals_sp) {
Process::SetUnixSignals(std::make_shared<GDBRemoteSignals>(signals_sp));
}
//------------------------------------------------------------------
// Process Queries
//------------------------------------------------------------------
bool ProcessGDBRemote::IsAlive() {
return m_gdb_comm.IsConnected() && Process::IsAlive();
}
addr_t ProcessGDBRemote::GetImageInfoAddress() {
// request the link map address via the $qShlibInfoAddr packet
lldb::addr_t addr = m_gdb_comm.GetShlibInfoAddr();
// the loaded module list can also provides a link map address
if (addr == LLDB_INVALID_ADDRESS) {
LoadedModuleInfoList list;
if (GetLoadedModuleList(list).Success())
addr = list.m_link_map;
}
return addr;
}
void ProcessGDBRemote::WillPublicStop() {
// See if the GDB remote client supports the JSON threads info. If so, we
// gather stop info for all threads, expedited registers, expedited memory,
// runtime queue information (iOS and MacOSX only), and more. Expediting
// memory will help stack backtracing be much faster. Expediting registers
// will make sure we don't have to read the thread registers for GPRs.
m_jthreadsinfo_sp = m_gdb_comm.GetThreadsInfo();
if (m_jthreadsinfo_sp) {
// Now set the stop info for each thread and also expedite any registers
// and memory that was in the jThreadsInfo response.
StructuredData::Array *thread_infos = m_jthreadsinfo_sp->GetAsArray();
if (thread_infos) {
const size_t n = thread_infos->GetSize();
for (size_t i = 0; i < n; ++i) {
StructuredData::Dictionary *thread_dict =
thread_infos->GetItemAtIndex(i)->GetAsDictionary();
if (thread_dict)
SetThreadStopInfo(thread_dict);
}
}
}
}
//------------------------------------------------------------------
// Process Memory
//------------------------------------------------------------------
size_t ProcessGDBRemote::DoReadMemory(addr_t addr, void *buf, size_t size,
Status &error) {
GetMaxMemorySize();
bool binary_memory_read = m_gdb_comm.GetxPacketSupported();
// M and m packets take 2 bytes for 1 byte of memory
size_t max_memory_size =
binary_memory_read ? m_max_memory_size : m_max_memory_size / 2;
if (size > max_memory_size) {
// Keep memory read sizes down to a sane limit. This function will be
// called multiple times in order to complete the task by
// lldb_private::Process so it is ok to do this.
size = max_memory_size;
}
char packet[64];
int packet_len;
packet_len = ::snprintf(packet, sizeof(packet), "%c%" PRIx64 ",%" PRIx64,
binary_memory_read ? 'x' : 'm', (uint64_t)addr,
(uint64_t)size);
assert(packet_len + 1 < (int)sizeof(packet));
UNUSED_IF_ASSERT_DISABLED(packet_len);
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet, response, true) ==
GDBRemoteCommunication::PacketResult::Success) {
if (response.IsNormalResponse()) {
error.Clear();
if (binary_memory_read) {
// The lower level GDBRemoteCommunication packet receive layer has
// already de-quoted any 0x7d character escaping that was present in
// the packet
size_t data_received_size = response.GetBytesLeft();
if (data_received_size > size) {
// Don't write past the end of BUF if the remote debug server gave us
// too much data for some reason.
data_received_size = size;
}
memcpy(buf, response.GetStringRef().data(), data_received_size);
return data_received_size;
} else {
return response.GetHexBytes(
llvm::MutableArrayRef<uint8_t>((uint8_t *)buf, size), '\xdd');
}
} else if (response.IsErrorResponse())
error.SetErrorStringWithFormat("memory read failed for 0x%" PRIx64, addr);
else if (response.IsUnsupportedResponse())
error.SetErrorStringWithFormat(
"GDB server does not support reading memory");
else
error.SetErrorStringWithFormat(
"unexpected response to GDB server memory read packet '%s': '%s'",
packet, response.GetStringRef().c_str());
} else {
error.SetErrorStringWithFormat("failed to send packet: '%s'", packet);
}
return 0;
}
Status ProcessGDBRemote::WriteObjectFile(
std::vector<ObjectFile::LoadableData> entries) {
Status error;
// Sort the entries by address because some writes, like those to flash
// memory, must happen in order of increasing address.
std::stable_sort(
std::begin(entries), std::end(entries),
[](const ObjectFile::LoadableData a, const ObjectFile::LoadableData b) {
return a.Dest < b.Dest;
});
m_allow_flash_writes = true;
error = Process::WriteObjectFile(entries);
if (error.Success())
error = FlashDone();
else
// Even though some of the writing failed, try to send a flash done if some
// of the writing succeeded so the flash state is reset to normal, but
// don't stomp on the error status that was set in the write failure since
// that's the one we want to report back.
FlashDone();
m_allow_flash_writes = false;
return error;
}
bool ProcessGDBRemote::HasErased(FlashRange range) {
auto size = m_erased_flash_ranges.GetSize();
for (size_t i = 0; i < size; ++i)
if (m_erased_flash_ranges.GetEntryAtIndex(i)->Contains(range))
return true;
return false;
}
Status ProcessGDBRemote::FlashErase(lldb::addr_t addr, size_t size) {
Status status;
MemoryRegionInfo region;
status = GetMemoryRegionInfo(addr, region);
if (!status.Success())
return status;
// The gdb spec doesn't say if erasures are allowed across multiple regions,
// but we'll disallow it to be safe and to keep the logic simple by worring
// about only one region's block size. DoMemoryWrite is this function's
// primary user, and it can easily keep writes within a single memory region
if (addr + size > region.GetRange().GetRangeEnd()) {
status.SetErrorString("Unable to erase flash in multiple regions");
return status;
}
uint64_t blocksize = region.GetBlocksize();
if (blocksize == 0) {
status.SetErrorString("Unable to erase flash because blocksize is 0");
return status;
}
// Erasures can only be done on block boundary adresses, so round down addr
// and round up size
lldb::addr_t block_start_addr = addr - (addr % blocksize);
size += (addr - block_start_addr);
if ((size % blocksize) != 0)
size += (blocksize - size % blocksize);
FlashRange range(block_start_addr, size);
if (HasErased(range))
return status;
// We haven't erased the entire range, but we may have erased part of it.
// (e.g., block A is already erased and range starts in A and ends in B). So,
// adjust range if necessary to exclude already erased blocks.
if (!m_erased_flash_ranges.IsEmpty()) {
// Assuming that writes and erasures are done in increasing addr order,
// because that is a requirement of the vFlashWrite command. Therefore, we
// only need to look at the last range in the list for overlap.
const auto &last_range = *m_erased_flash_ranges.Back();
if (range.GetRangeBase() < last_range.GetRangeEnd()) {
auto overlap = last_range.GetRangeEnd() - range.GetRangeBase();
// overlap will be less than range.GetByteSize() or else HasErased()
// would have been true
range.SetByteSize(range.GetByteSize() - overlap);
range.SetRangeBase(range.GetRangeBase() + overlap);
}
}
StreamString packet;
packet.Printf("vFlashErase:%" PRIx64 ",%" PRIx64, range.GetRangeBase(),
(uint64_t)range.GetByteSize());
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
true) ==
GDBRemoteCommunication::PacketResult::Success) {
if (response.IsOKResponse()) {
m_erased_flash_ranges.Insert(range, true);
} else {
if (response.IsErrorResponse())
status.SetErrorStringWithFormat("flash erase failed for 0x%" PRIx64,
addr);
else if (response.IsUnsupportedResponse())
status.SetErrorStringWithFormat("GDB server does not support flashing");
else
status.SetErrorStringWithFormat(
"unexpected response to GDB server flash erase packet '%s': '%s'",
packet.GetData(), response.GetStringRef().c_str());
}
} else {
status.SetErrorStringWithFormat("failed to send packet: '%s'",
packet.GetData());
}
return status;
}
Status ProcessGDBRemote::FlashDone() {
Status status;
// If we haven't erased any blocks, then we must not have written anything
// either, so there is no need to actually send a vFlashDone command
if (m_erased_flash_ranges.IsEmpty())
return status;
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse("vFlashDone", response, true) ==
GDBRemoteCommunication::PacketResult::Success) {
if (response.IsOKResponse()) {
m_erased_flash_ranges.Clear();
} else {
if (response.IsErrorResponse())
status.SetErrorStringWithFormat("flash done failed");
else if (response.IsUnsupportedResponse())
status.SetErrorStringWithFormat("GDB server does not support flashing");
else
status.SetErrorStringWithFormat(
"unexpected response to GDB server flash done packet: '%s'",
response.GetStringRef().c_str());
}
} else {
status.SetErrorStringWithFormat("failed to send flash done packet");
}
return status;
}
size_t ProcessGDBRemote::DoWriteMemory(addr_t addr, const void *buf,
size_t size, Status &error) {
GetMaxMemorySize();
// M and m packets take 2 bytes for 1 byte of memory
size_t max_memory_size = m_max_memory_size / 2;
if (size > max_memory_size) {
// Keep memory read sizes down to a sane limit. This function will be
// called multiple times in order to complete the task by
// lldb_private::Process so it is ok to do this.
size = max_memory_size;
}
StreamGDBRemote packet;
MemoryRegionInfo region;
Status region_status = GetMemoryRegionInfo(addr, region);
bool is_flash =
region_status.Success() && region.GetFlash() == MemoryRegionInfo::eYes;
if (is_flash) {
if (!m_allow_flash_writes) {
error.SetErrorString("Writing to flash memory is not allowed");
return 0;
}
// Keep the write within a flash memory region
if (addr + size > region.GetRange().GetRangeEnd())
size = region.GetRange().GetRangeEnd() - addr;
// Flash memory must be erased before it can be written
error = FlashErase(addr, size);
if (!error.Success())
return 0;
packet.Printf("vFlashWrite:%" PRIx64 ":", addr);
packet.PutEscapedBytes(buf, size);
} else {
packet.Printf("M%" PRIx64 ",%" PRIx64 ":", addr, (uint64_t)size);
packet.PutBytesAsRawHex8(buf, size, endian::InlHostByteOrder(),
endian::InlHostByteOrder());
}
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
true) ==
GDBRemoteCommunication::PacketResult::Success) {
if (response.IsOKResponse()) {
error.Clear();
return size;
} else if (response.IsErrorResponse())
error.SetErrorStringWithFormat("memory write failed for 0x%" PRIx64,
addr);
else if (response.IsUnsupportedResponse())
error.SetErrorStringWithFormat(
"GDB server does not support writing memory");
else
error.SetErrorStringWithFormat(
"unexpected response to GDB server memory write packet '%s': '%s'",
packet.GetData(), response.GetStringRef().c_str());
} else {
error.SetErrorStringWithFormat("failed to send packet: '%s'",
packet.GetData());
}
return 0;
}
lldb::addr_t ProcessGDBRemote::DoAllocateMemory(size_t size,
uint32_t permissions,
Status &error) {
Log *log(
GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_EXPRESSIONS));
addr_t allocated_addr = LLDB_INVALID_ADDRESS;
if (m_gdb_comm.SupportsAllocDeallocMemory() != eLazyBoolNo) {
allocated_addr = m_gdb_comm.AllocateMemory(size, permissions);
if (allocated_addr != LLDB_INVALID_ADDRESS ||
m_gdb_comm.SupportsAllocDeallocMemory() == eLazyBoolYes)
return allocated_addr;
}
if (m_gdb_comm.SupportsAllocDeallocMemory() == eLazyBoolNo) {
// Call mmap() to create memory in the inferior..
unsigned prot = 0;
if (permissions & lldb::ePermissionsReadable)
prot |= eMmapProtRead;
if (permissions & lldb::ePermissionsWritable)
prot |= eMmapProtWrite;
if (permissions & lldb::ePermissionsExecutable)
prot |= eMmapProtExec;
if (InferiorCallMmap(this, allocated_addr, 0, size, prot,
eMmapFlagsAnon | eMmapFlagsPrivate, -1, 0))
m_addr_to_mmap_size[allocated_addr] = size;
else {
allocated_addr = LLDB_INVALID_ADDRESS;
if (log)
log->Printf("ProcessGDBRemote::%s no direct stub support for memory "
"allocation, and InferiorCallMmap also failed - is stub "
"missing register context save/restore capability?",
__FUNCTION__);
}
}
if (allocated_addr == LLDB_INVALID_ADDRESS)
error.SetErrorStringWithFormat(
"unable to allocate %" PRIu64 " bytes of memory with permissions %s",
(uint64_t)size, GetPermissionsAsCString(permissions));
else
error.Clear();
return allocated_addr;
}
Status ProcessGDBRemote::GetMemoryRegionInfo(addr_t load_addr,
MemoryRegionInfo &region_info) {
Status error(m_gdb_comm.GetMemoryRegionInfo(load_addr, region_info));
return error;
}
Status ProcessGDBRemote::GetWatchpointSupportInfo(uint32_t &num) {
Status error(m_gdb_comm.GetWatchpointSupportInfo(num));
return error;
}
Status ProcessGDBRemote::GetWatchpointSupportInfo(uint32_t &num, bool &after) {
Status error(m_gdb_comm.GetWatchpointSupportInfo(
num, after, GetTarget().GetArchitecture()));
return error;
}
Status ProcessGDBRemote::DoDeallocateMemory(lldb::addr_t addr) {
Status error;
LazyBool supported = m_gdb_comm.SupportsAllocDeallocMemory();
switch (supported) {
case eLazyBoolCalculate:
// We should never be deallocating memory without allocating memory first
// so we should never get eLazyBoolCalculate
error.SetErrorString(
"tried to deallocate memory without ever allocating memory");
break;
case eLazyBoolYes:
if (!m_gdb_comm.DeallocateMemory(addr))
error.SetErrorStringWithFormat(
"unable to deallocate memory at 0x%" PRIx64, addr);
break;
case eLazyBoolNo:
// Call munmap() to deallocate memory in the inferior..
{
MMapMap::iterator pos = m_addr_to_mmap_size.find(addr);
if (pos != m_addr_to_mmap_size.end() &&
InferiorCallMunmap(this, addr, pos->second))
m_addr_to_mmap_size.erase(pos);
else
error.SetErrorStringWithFormat(
"unable to deallocate memory at 0x%" PRIx64, addr);
}
break;
}
return error;
}
//------------------------------------------------------------------
// Process STDIO
//------------------------------------------------------------------
size_t ProcessGDBRemote::PutSTDIN(const char *src, size_t src_len,
Status &error) {
if (m_stdio_communication.IsConnected()) {
ConnectionStatus status;
m_stdio_communication.Write(src, src_len, status, NULL);
} else if (m_stdin_forward) {
m_gdb_comm.SendStdinNotification(src, src_len);
}
return 0;
}
Status ProcessGDBRemote::EnableBreakpointSite(BreakpointSite *bp_site) {
Status error;
assert(bp_site != NULL);
// Get logging info
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_BREAKPOINTS));
user_id_t site_id = bp_site->GetID();
// Get the breakpoint address
const addr_t addr = bp_site->GetLoadAddress();
// Log that a breakpoint was requested
if (log)
log->Printf("ProcessGDBRemote::EnableBreakpointSite (size_id = %" PRIu64
") address = 0x%" PRIx64,
site_id, (uint64_t)addr);
// Breakpoint already exists and is enabled
if (bp_site->IsEnabled()) {
if (log)
log->Printf("ProcessGDBRemote::EnableBreakpointSite (size_id = %" PRIu64
") address = 0x%" PRIx64 " -- SUCCESS (already enabled)",
site_id, (uint64_t)addr);
return error;
}
// Get the software breakpoint trap opcode size
const size_t bp_op_size = GetSoftwareBreakpointTrapOpcode(bp_site);
// SupportsGDBStoppointPacket() simply checks a boolean, indicating if this
// breakpoint type is supported by the remote stub. These are set to true by
// default, and later set to false only after we receive an unimplemented
// response when sending a breakpoint packet. This means initially that
// unless we were specifically instructed to use a hardware breakpoint, LLDB
// will attempt to set a software breakpoint. HardwareRequired() also queries
// a boolean variable which indicates if the user specifically asked for
// hardware breakpoints. If true then we will skip over software
// breakpoints.
if (m_gdb_comm.SupportsGDBStoppointPacket(eBreakpointSoftware) &&
(!bp_site->HardwareRequired())) {
// Try to send off a software breakpoint packet ($Z0)
uint8_t error_no = m_gdb_comm.SendGDBStoppointTypePacket(
eBreakpointSoftware, true, addr, bp_op_size);
if (error_no == 0) {
// The breakpoint was placed successfully
bp_site->SetEnabled(true);
bp_site->SetType(BreakpointSite::eExternal);
return error;
}
// SendGDBStoppointTypePacket() will return an error if it was unable to
// set this breakpoint. We need to differentiate between a error specific
// to placing this breakpoint or if we have learned that this breakpoint
// type is unsupported. To do this, we must test the support boolean for
// this breakpoint type to see if it now indicates that this breakpoint
// type is unsupported. If they are still supported then we should return
// with the error code. If they are now unsupported, then we would like to
// fall through and try another form of breakpoint.
if (m_gdb_comm.SupportsGDBStoppointPacket(eBreakpointSoftware)) {
if (error_no != UINT8_MAX)
error.SetErrorStringWithFormat(
"error: %d sending the breakpoint request", errno);
else
error.SetErrorString("error sending the breakpoint request");
return error;
}
// We reach here when software breakpoints have been found to be
// unsupported. For future calls to set a breakpoint, we will not attempt
// to set a breakpoint with a type that is known not to be supported.
if (log)
log->Printf("Software breakpoints are unsupported");
// So we will fall through and try a hardware breakpoint
}
// The process of setting a hardware breakpoint is much the same as above.
// We check the supported boolean for this breakpoint type, and if it is
// thought to be supported then we will try to set this breakpoint with a
// hardware breakpoint.
if (m_gdb_comm.SupportsGDBStoppointPacket(eBreakpointHardware)) {
// Try to send off a hardware breakpoint packet ($Z1)
uint8_t error_no = m_gdb_comm.SendGDBStoppointTypePacket(
eBreakpointHardware, true, addr, bp_op_size);
if (error_no == 0) {
// The breakpoint was placed successfully
bp_site->SetEnabled(true);
bp_site->SetType(BreakpointSite::eHardware);
return error;
}
// Check if the error was something other then an unsupported breakpoint
// type
if (m_gdb_comm.SupportsGDBStoppointPacket(eBreakpointHardware)) {
// Unable to set this hardware breakpoint
if (error_no != UINT8_MAX)
error.SetErrorStringWithFormat(
"error: %d sending the hardware breakpoint request "
"(hardware breakpoint resources might be exhausted or unavailable)",
error_no);
else
error.SetErrorString("error sending the hardware breakpoint request "
"(hardware breakpoint resources "
"might be exhausted or unavailable)");
return error;
}
// We will reach here when the stub gives an unsupported response to a
// hardware breakpoint
if (log)
log->Printf("Hardware breakpoints are unsupported");
// Finally we will falling through to a #trap style breakpoint
}
// Don't fall through when hardware breakpoints were specifically requested
if (bp_site->HardwareRequired()) {
error.SetErrorString("hardware breakpoints are not supported");
return error;
}
// As a last resort we want to place a manual breakpoint. An instruction is
// placed into the process memory using memory write packets.
return EnableSoftwareBreakpoint(bp_site);
}
Status ProcessGDBRemote::DisableBreakpointSite(BreakpointSite *bp_site) {
Status error;
assert(bp_site != NULL);
addr_t addr = bp_site->GetLoadAddress();
user_id_t site_id = bp_site->GetID();
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_BREAKPOINTS));
if (log)
log->Printf("ProcessGDBRemote::DisableBreakpointSite (site_id = %" PRIu64
") addr = 0x%8.8" PRIx64,
site_id, (uint64_t)addr);
if (bp_site->IsEnabled()) {
const size_t bp_op_size = GetSoftwareBreakpointTrapOpcode(bp_site);
BreakpointSite::Type bp_type = bp_site->GetType();
switch (bp_type) {
case BreakpointSite::eSoftware:
error = DisableSoftwareBreakpoint(bp_site);
break;
case BreakpointSite::eHardware:
if (m_gdb_comm.SendGDBStoppointTypePacket(eBreakpointHardware, false,
addr, bp_op_size))
error.SetErrorToGenericError();
break;
case BreakpointSite::eExternal: {
GDBStoppointType stoppoint_type;
if (bp_site->IsHardware())
stoppoint_type = eBreakpointHardware;
else
stoppoint_type = eBreakpointSoftware;
if (m_gdb_comm.SendGDBStoppointTypePacket(stoppoint_type, false, addr,
bp_op_size))
error.SetErrorToGenericError();
} break;
}
if (error.Success())
bp_site->SetEnabled(false);
} else {
if (log)
log->Printf("ProcessGDBRemote::DisableBreakpointSite (site_id = %" PRIu64
") addr = 0x%8.8" PRIx64 " -- SUCCESS (already disabled)",
site_id, (uint64_t)addr);
return error;
}
if (error.Success())
error.SetErrorToGenericError();
return error;
}
// Pre-requisite: wp != NULL.
static GDBStoppointType GetGDBStoppointType(Watchpoint *wp) {
assert(wp);
bool watch_read = wp->WatchpointRead();
bool watch_write = wp->WatchpointWrite();
// watch_read and watch_write cannot both be false.
assert(watch_read || watch_write);
if (watch_read && watch_write)
return eWatchpointReadWrite;
else if (watch_read)
return eWatchpointRead;
else // Must be watch_write, then.
return eWatchpointWrite;
}
Status ProcessGDBRemote::EnableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp) {
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log(
ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessGDBRemote::EnableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (wp->IsEnabled()) {
if (log)
log->Printf("ProcessGDBRemote::EnableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already enabled.",
watchID, (uint64_t)addr);
return error;
}
GDBStoppointType type = GetGDBStoppointType(wp);
// Pass down an appropriate z/Z packet...
if (m_gdb_comm.SupportsGDBStoppointPacket(type)) {
if (m_gdb_comm.SendGDBStoppointTypePacket(type, true, addr,
wp->GetByteSize()) == 0) {
wp->SetEnabled(true, notify);
return error;
} else
error.SetErrorString("sending gdb watchpoint packet failed");
} else
error.SetErrorString("watchpoints not supported");
} else {
error.SetErrorString("Watchpoint argument was NULL.");
}
if (error.Success())
error.SetErrorToGenericError();
return error;
}
Status ProcessGDBRemote::DisableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp) {
user_id_t watchID = wp->GetID();
Log *log(
ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_WATCHPOINTS));
addr_t addr = wp->GetLoadAddress();
if (log)
log->Printf("ProcessGDBRemote::DisableWatchpoint (watchID = %" PRIu64
") addr = 0x%8.8" PRIx64,
watchID, (uint64_t)addr);
if (!wp->IsEnabled()) {
if (log)
log->Printf("ProcessGDBRemote::DisableWatchpoint (watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 " -- SUCCESS (already disabled)",
watchID, (uint64_t)addr);
// See also 'class WatchpointSentry' within StopInfo.cpp. This disabling
// attempt might come from the user-supplied actions, we'll route it in
// order for the watchpoint object to intelligently process this action.
wp->SetEnabled(false, notify);
return error;
}
if (wp->IsHardware()) {
GDBStoppointType type = GetGDBStoppointType(wp);
// Pass down an appropriate z/Z packet...
if (m_gdb_comm.SendGDBStoppointTypePacket(type, false, addr,
wp->GetByteSize()) == 0) {
wp->SetEnabled(false, notify);
return error;
} else
error.SetErrorString("sending gdb watchpoint packet failed");
}
// TODO: clear software watchpoints if we implement them
} else {
error.SetErrorString("Watchpoint argument was NULL.");
}
if (error.Success())
error.SetErrorToGenericError();
return error;
}
void ProcessGDBRemote::Clear() {
m_thread_list_real.Clear();
m_thread_list.Clear();
}
Status ProcessGDBRemote::DoSignal(int signo) {
Status error;
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::DoSignal (signal = %d)", signo);
if (!m_gdb_comm.SendAsyncSignal(signo))
error.SetErrorStringWithFormat("failed to send signal %i", signo);
return error;
}
Status ProcessGDBRemote::ConnectToReplayServer(repro::Loader *loader) {
if (!loader)
return Status("No loader provided.");
auto provider_info = loader->GetProviderInfo("gdb-remote");
if (!provider_info)
return Status("No provider for gdb-remote.");
if (provider_info->files.empty())
return Status("Provider for gdb-remote contains no files.");
// Construct replay history path.
FileSpec history_file(loader->GetDirectory());
history_file.AppendPathComponent(provider_info->files.front());
// Enable replay mode.
m_replay_mode = true;
// Load replay history.
if (auto error = m_gdb_replay_server.LoadReplayHistory(history_file))
return Status("Unable to load replay history");
// Make a local connection.
if (auto error = GDBRemoteCommunication::ConnectLocally(m_gdb_comm,
m_gdb_replay_server))
return Status("Unable to connect to replay server");
// Start server thread.
m_gdb_replay_server.StartAsyncThread();
// Start client thread.
StartAsyncThread();
// Do the usual setup.
return ConnectToDebugserver("");
}
Status
ProcessGDBRemote::EstablishConnectionIfNeeded(const ProcessInfo &process_info) {
// Make sure we aren't already connected?
if (m_gdb_comm.IsConnected())
return Status();
PlatformSP platform_sp(GetTarget().GetPlatform());
if (platform_sp && !platform_sp->IsHost())
return Status("Lost debug server connection");
if (repro::Loader *loader = repro::Reproducer::Instance().GetLoader())
return ConnectToReplayServer(loader);
auto error = LaunchAndConnectToDebugserver(process_info);
if (error.Fail()) {
const char *error_string = error.AsCString();
if (error_string == nullptr)
error_string = "unable to launch " DEBUGSERVER_BASENAME;
}
return error;
}
#if !defined(_WIN32)
#define USE_SOCKETPAIR_FOR_LOCAL_CONNECTION 1
#endif
#ifdef USE_SOCKETPAIR_FOR_LOCAL_CONNECTION
static bool SetCloexecFlag(int fd) {
#if defined(FD_CLOEXEC)
int flags = ::fcntl(fd, F_GETFD);
if (flags == -1)
return false;
return (::fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == 0);
#else
return false;
#endif
}
#endif
Status ProcessGDBRemote::LaunchAndConnectToDebugserver(
const ProcessInfo &process_info) {
using namespace std::placeholders; // For _1, _2, etc.
Status error;
if (m_debugserver_pid == LLDB_INVALID_PROCESS_ID) {
// If we locate debugserver, keep that located version around
static FileSpec g_debugserver_file_spec;
ProcessLaunchInfo debugserver_launch_info;
// Make debugserver run in its own session so signals generated by special
// terminal key sequences (^C) don't affect debugserver.
debugserver_launch_info.SetLaunchInSeparateProcessGroup(true);
const std::weak_ptr<ProcessGDBRemote> this_wp =
std::static_pointer_cast<ProcessGDBRemote>(shared_from_this());
debugserver_launch_info.SetMonitorProcessCallback(
std::bind(MonitorDebugserverProcess, this_wp, _1, _2, _3, _4), false);
debugserver_launch_info.SetUserID(process_info.GetUserID());
int communication_fd = -1;
#ifdef USE_SOCKETPAIR_FOR_LOCAL_CONNECTION
// Use a socketpair on non-Windows systems for security and performance
// reasons.
int sockets[2]; /* the pair of socket descriptors */
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == -1) {
error.SetErrorToErrno();
return error;
}
int our_socket = sockets[0];
int gdb_socket = sockets[1];
CleanUp cleanup_our(close, our_socket);
CleanUp cleanup_gdb(close, gdb_socket);
// Don't let any child processes inherit our communication socket
SetCloexecFlag(our_socket);
communication_fd = gdb_socket;
#endif
error = m_gdb_comm.StartDebugserverProcess(
nullptr, GetTarget().GetPlatform().get(), debugserver_launch_info,
nullptr, nullptr, communication_fd);
if (error.Success())
m_debugserver_pid = debugserver_launch_info.GetProcessID();
else
m_debugserver_pid = LLDB_INVALID_PROCESS_ID;
if (m_debugserver_pid != LLDB_INVALID_PROCESS_ID) {
#ifdef USE_SOCKETPAIR_FOR_LOCAL_CONNECTION
// Our process spawned correctly, we can now set our connection to use
// our end of the socket pair
cleanup_our.disable();
m_gdb_comm.SetConnection(new ConnectionFileDescriptor(our_socket, true));
#endif
StartAsyncThread();
}
if (error.Fail()) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("failed to start debugserver process: %s",
error.AsCString());
return error;
}
if (m_gdb_comm.IsConnected()) {
// Finish the connection process by doing the handshake without
// connecting (send NULL URL)
error = ConnectToDebugserver("");
} else {
error.SetErrorString("connection failed");
}
}
return error;
}
bool ProcessGDBRemote::MonitorDebugserverProcess(
std::weak_ptr<ProcessGDBRemote> process_wp, lldb::pid_t debugserver_pid,
bool exited, // True if the process did exit
int signo, // Zero for no signal
int exit_status // Exit value of process if signal is zero
) {
// "debugserver_pid" argument passed in is the process ID for debugserver
// that we are tracking...
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
const bool handled = true;
if (log)
log->Printf("ProcessGDBRemote::%s(process_wp, pid=%" PRIu64
", signo=%i (0x%x), exit_status=%i)",
__FUNCTION__, debugserver_pid, signo, signo, exit_status);
std::shared_ptr<ProcessGDBRemote> process_sp = process_wp.lock();
if (log)
log->Printf("ProcessGDBRemote::%s(process = %p)", __FUNCTION__,
static_cast<void *>(process_sp.get()));
if (!process_sp || process_sp->m_debugserver_pid != debugserver_pid)
return handled;
// Sleep for a half a second to make sure our inferior process has time to
// set its exit status before we set it incorrectly when both the debugserver
// and the inferior process shut down.
usleep(500000);
// If our process hasn't yet exited, debugserver might have died. If the
// process did exit, then we are reaping it.
const StateType state = process_sp->GetState();
if (state != eStateInvalid && state != eStateUnloaded &&
state != eStateExited && state != eStateDetached) {
char error_str[1024];
if (signo) {
const char *signal_cstr =
process_sp->GetUnixSignals()->GetSignalAsCString(signo);
if (signal_cstr)
::snprintf(error_str, sizeof(error_str),
DEBUGSERVER_BASENAME " died with signal %s", signal_cstr);
else
::snprintf(error_str, sizeof(error_str),
DEBUGSERVER_BASENAME " died with signal %i", signo);
} else {
::snprintf(error_str, sizeof(error_str),
DEBUGSERVER_BASENAME " died with an exit status of 0x%8.8x",
exit_status);
}
process_sp->SetExitStatus(-1, error_str);
}
// Debugserver has exited we need to let our ProcessGDBRemote know that it no
// longer has a debugserver instance
process_sp->m_debugserver_pid = LLDB_INVALID_PROCESS_ID;
return handled;
}
void ProcessGDBRemote::KillDebugserverProcess() {
m_gdb_comm.Disconnect();
if (m_debugserver_pid != LLDB_INVALID_PROCESS_ID) {
Host::Kill(m_debugserver_pid, SIGINT);
m_debugserver_pid = LLDB_INVALID_PROCESS_ID;
}
}
void ProcessGDBRemote::Initialize() {
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
DebuggerInitialize);
});
}
void ProcessGDBRemote::DebuggerInitialize(Debugger &debugger) {
if (!PluginManager::GetSettingForProcessPlugin(
debugger, PluginProperties::GetSettingName())) {
const bool is_global_setting = true;
PluginManager::CreateSettingForProcessPlugin(
debugger, GetGlobalPluginProperties()->GetValueProperties(),
ConstString("Properties for the gdb-remote process plug-in."),
is_global_setting);
}
}
bool ProcessGDBRemote::StartAsyncThread() {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::%s ()", __FUNCTION__);
std::lock_guard<std::recursive_mutex> guard(m_async_thread_state_mutex);
if (!m_async_thread.IsJoinable()) {
// Create a thread that watches our internal state and controls which
// events make it to clients (into the DCProcess event queue).
m_async_thread =
ThreadLauncher::LaunchThread("<lldb.process.gdb-remote.async>",
ProcessGDBRemote::AsyncThread, this, NULL);
} else if (log)
log->Printf("ProcessGDBRemote::%s () - Called when Async thread was "
"already running.",
__FUNCTION__);
return m_async_thread.IsJoinable();
}
void ProcessGDBRemote::StopAsyncThread() {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::%s ()", __FUNCTION__);
std::lock_guard<std::recursive_mutex> guard(m_async_thread_state_mutex);
if (m_async_thread.IsJoinable()) {
m_async_broadcaster.BroadcastEvent(eBroadcastBitAsyncThreadShouldExit);
// This will shut down the async thread.
m_gdb_comm.Disconnect(); // Disconnect from the debug server.
// Stop the stdio thread
m_async_thread.Join(nullptr);
m_async_thread.Reset();
} else if (log)
log->Printf(
"ProcessGDBRemote::%s () - Called when Async thread was not running.",
__FUNCTION__);
}
bool ProcessGDBRemote::HandleNotifyPacket(StringExtractorGDBRemote &packet) {
// get the packet at a string
const std::string &pkt = packet.GetStringRef();
// skip %stop:
StringExtractorGDBRemote stop_info(pkt.c_str() + 5);
// pass as a thread stop info packet
SetLastStopPacket(stop_info);
// check for more stop reasons
HandleStopReplySequence();
// if the process is stopped then we need to fake a resume so that we can
// stop properly with the new break. This is possible due to
// SetPrivateState() broadcasting the state change as a side effect.
if (GetPrivateState() == lldb::StateType::eStateStopped) {
SetPrivateState(lldb::StateType::eStateRunning);
}
// since we have some stopped packets we can halt the process
SetPrivateState(lldb::StateType::eStateStopped);
return true;
}
thread_result_t ProcessGDBRemote::AsyncThread(void *arg) {
ProcessGDBRemote *process = (ProcessGDBRemote *)arg;
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") thread starting...",
__FUNCTION__, arg, process->GetID());
EventSP event_sp;
bool done = false;
while (!done) {
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") listener.WaitForEvent (NULL, event_sp)...",
__FUNCTION__, arg, process->GetID());
if (process->m_async_listener_sp->GetEvent(event_sp, llvm::None)) {
const uint32_t event_type = event_sp->GetType();
if (event_sp->BroadcasterIs(&process->m_async_broadcaster)) {
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") Got an event of type: %d...",
__FUNCTION__, arg, process->GetID(), event_type);
switch (event_type) {
case eBroadcastBitAsyncContinue: {
const EventDataBytes *continue_packet =
EventDataBytes::GetEventDataFromEvent(event_sp.get());
if (continue_packet) {
const char *continue_cstr =
(const char *)continue_packet->GetBytes();
const size_t continue_cstr_len = continue_packet->GetByteSize();
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") got eBroadcastBitAsyncContinue: %s",
__FUNCTION__, arg, process->GetID(), continue_cstr);
if (::strstr(continue_cstr, "vAttach") == NULL)
process->SetPrivateState(eStateRunning);
StringExtractorGDBRemote response;
// If in Non-Stop-Mode
if (process->GetTarget().GetNonStopModeEnabled()) {
// send the vCont packet
if (!process->GetGDBRemote().SendvContPacket(
llvm::StringRef(continue_cstr, continue_cstr_len),
response)) {
// Something went wrong
done = true;
break;
}
}
// If in All-Stop-Mode
else {
StateType stop_state =
process->GetGDBRemote().SendContinuePacketAndWaitForResponse(
*process, *process->GetUnixSignals(),
llvm::StringRef(continue_cstr, continue_cstr_len),
response);
// We need to immediately clear the thread ID list so we are sure
// to get a valid list of threads. The thread ID list might be
// contained within the "response", or the stop reply packet that
// caused the stop. So clear it now before we give the stop reply
// packet to the process using the
// process->SetLastStopPacket()...
process->ClearThreadIDList();
switch (stop_state) {
case eStateStopped:
case eStateCrashed:
case eStateSuspended:
process->SetLastStopPacket(response);
process->SetPrivateState(stop_state);
break;
case eStateExited: {
process->SetLastStopPacket(response);
process->ClearThreadIDList();
response.SetFilePos(1);
int exit_status = response.GetHexU8();
std::string desc_string;
if (response.GetBytesLeft() > 0 &&
response.GetChar('-') == ';') {
llvm::StringRef desc_str;
llvm::StringRef desc_token;
while (response.GetNameColonValue(desc_token, desc_str)) {
if (desc_token != "description")
continue;
StringExtractor extractor(desc_str);
extractor.GetHexByteString(desc_string);
}
}
process->SetExitStatus(exit_status, desc_string.c_str());
done = true;
break;
}
case eStateInvalid: {
// Check to see if we were trying to attach and if we got back
// the "E87" error code from debugserver -- this indicates that
// the process is not debuggable. Return a slightly more
// helpful error message about why the attach failed.
if (::strstr(continue_cstr, "vAttach") != NULL &&
response.GetError() == 0x87) {
process->SetExitStatus(-1, "cannot attach to process due to "
"System Integrity Protection");
} else if (::strstr(continue_cstr, "vAttach") != NULL &&
response.GetStatus().Fail()) {
process->SetExitStatus(-1, response.GetStatus().AsCString());
} else {
process->SetExitStatus(-1, "lost connection");
}
break;
}
default:
process->SetPrivateState(stop_state);
break;
} // switch(stop_state)
} // else // if in All-stop-mode
} // if (continue_packet)
} // case eBroadcastBitAysncContinue
break;
case eBroadcastBitAsyncThreadShouldExit:
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") got eBroadcastBitAsyncThreadShouldExit...",
__FUNCTION__, arg, process->GetID());
done = true;
break;
default:
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") got unknown event 0x%8.8x",
__FUNCTION__, arg, process->GetID(), event_type);
done = true;
break;
}
} else if (event_sp->BroadcasterIs(&process->m_gdb_comm)) {
switch (event_type) {
case Communication::eBroadcastBitReadThreadDidExit:
process->SetExitStatus(-1, "lost connection");
done = true;
break;
case GDBRemoteCommunication::eBroadcastBitGdbReadThreadGotNotify: {
lldb_private::Event *event = event_sp.get();
const EventDataBytes *continue_packet =
EventDataBytes::GetEventDataFromEvent(event);
StringExtractorGDBRemote notify(
(const char *)continue_packet->GetBytes());
// Hand this over to the process to handle
process->HandleNotifyPacket(notify);
break;
}
default:
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") got unknown event 0x%8.8x",
__FUNCTION__, arg, process->GetID(), event_type);
done = true;
break;
}
}
} else {
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") listener.WaitForEvent (NULL, event_sp) => false",
__FUNCTION__, arg, process->GetID());
done = true;
}
}
if (log)
log->Printf("ProcessGDBRemote::%s (arg = %p, pid = %" PRIu64
") thread exiting...",
__FUNCTION__, arg, process->GetID());
return NULL;
}
// uint32_t
// ProcessGDBRemote::ListProcessesMatchingName (const char *name, StringList
// &matches, std::vector<lldb::pid_t> &pids)
//{
// // If we are planning to launch the debugserver remotely, then we need to
// fire up a debugserver
// // process and ask it for the list of processes. But if we are local, we
// can let the Host do it.
// if (m_local_debugserver)
// {
// return Host::ListProcessesMatchingName (name, matches, pids);
// }
// else
// {
// // FIXME: Implement talking to the remote debugserver.
// return 0;
// }
//
//}
//
bool ProcessGDBRemote::NewThreadNotifyBreakpointHit(
void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id,
lldb::user_id_t break_loc_id) {
// I don't think I have to do anything here, just make sure I notice the new
// thread when it starts to
// run so I can stop it if that's what I want to do.
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
if (log)
log->Printf("Hit New Thread Notification breakpoint.");
return false;
}
Status ProcessGDBRemote::UpdateAutomaticSignalFiltering() {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
LLDB_LOG(log, "Check if need to update ignored signals");
// QPassSignals package is not supported by the server, there is no way we
// can ignore any signals on server side.
if (!m_gdb_comm.GetQPassSignalsSupported())
return Status();
// No signals, nothing to send.
if (m_unix_signals_sp == nullptr)
return Status();
// Signals' version hasn't changed, no need to send anything.
uint64_t new_signals_version = m_unix_signals_sp->GetVersion();
if (new_signals_version == m_last_signals_version) {
LLDB_LOG(log, "Signals' version hasn't changed. version={0}",
m_last_signals_version);
return Status();
}
auto signals_to_ignore =
m_unix_signals_sp->GetFilteredSignals(false, false, false);
Status error = m_gdb_comm.SendSignalsToIgnore(signals_to_ignore);
LLDB_LOG(log,
"Signals' version changed. old version={0}, new version={1}, "
"signals ignored={2}, update result={3}",
m_last_signals_version, new_signals_version,
signals_to_ignore.size(), error);
if (error.Success())
m_last_signals_version = new_signals_version;
return error;
}
bool ProcessGDBRemote::StartNoticingNewThreads() {
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
if (m_thread_create_bp_sp) {
if (log && log->GetVerbose())
log->Printf("Enabled noticing new thread breakpoint.");
m_thread_create_bp_sp->SetEnabled(true);
} else {
PlatformSP platform_sp(GetTarget().GetPlatform());
if (platform_sp) {
m_thread_create_bp_sp =
platform_sp->SetThreadCreationBreakpoint(GetTarget());
if (m_thread_create_bp_sp) {
if (log && log->GetVerbose())
log->Printf(
"Successfully created new thread notification breakpoint %i",
m_thread_create_bp_sp->GetID());
m_thread_create_bp_sp->SetCallback(
ProcessGDBRemote::NewThreadNotifyBreakpointHit, this, true);
} else {
if (log)
log->Printf("Failed to create new thread notification breakpoint.");
}
}
}
return m_thread_create_bp_sp.get() != NULL;
}
bool ProcessGDBRemote::StopNoticingNewThreads() {
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
if (log && log->GetVerbose())
log->Printf("Disabling new thread notification breakpoint.");
if (m_thread_create_bp_sp)
m_thread_create_bp_sp->SetEnabled(false);
return true;
}
DynamicLoader *ProcessGDBRemote::GetDynamicLoader() {
if (m_dyld_ap.get() == NULL)
m_dyld_ap.reset(DynamicLoader::FindPlugin(this, NULL));
return m_dyld_ap.get();
}
Status ProcessGDBRemote::SendEventData(const char *data) {
int return_value;
bool was_supported;
Status error;
return_value = m_gdb_comm.SendLaunchEventDataPacket(data, &was_supported);
if (return_value != 0) {
if (!was_supported)
error.SetErrorString("Sending events is not supported for this process.");
else
error.SetErrorStringWithFormat("Error sending event data: %d.",
return_value);
}
return error;
}
const DataBufferSP ProcessGDBRemote::GetAuxvData() {
DataBufferSP buf;
if (m_gdb_comm.GetQXferAuxvReadSupported()) {
std::string response_string;
if (m_gdb_comm.SendPacketsAndConcatenateResponses("qXfer:auxv:read::",
response_string) ==
GDBRemoteCommunication::PacketResult::Success)
buf.reset(new DataBufferHeap(response_string.c_str(),
response_string.length()));
}
return buf;
}
StructuredData::ObjectSP
ProcessGDBRemote::GetExtendedInfoForThread(lldb::tid_t tid) {
StructuredData::ObjectSP object_sp;
if (m_gdb_comm.GetThreadExtendedInfoSupported()) {
StructuredData::ObjectSP args_dict(new StructuredData::Dictionary());
SystemRuntime *runtime = GetSystemRuntime();
if (runtime) {
runtime->AddThreadExtendedInfoPacketHints(args_dict);
}
args_dict->GetAsDictionary()->AddIntegerItem("thread", tid);
StreamString packet;
packet << "jThreadExtendedInfo:";
args_dict->Dump(packet, false);
// FIXME the final character of a JSON dictionary, '}', is the escape
// character in gdb-remote binary mode. lldb currently doesn't escape
// these characters in its packet output -- so we add the quoted version of
// the } character here manually in case we talk to a debugserver which un-
// escapes the characters at packet read time.
packet << (char)(0x7d ^ 0x20);
StringExtractorGDBRemote response;
response.SetResponseValidatorToJSON();
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
false) ==
GDBRemoteCommunication::PacketResult::Success) {
StringExtractorGDBRemote::ResponseType response_type =
response.GetResponseType();
if (response_type == StringExtractorGDBRemote::eResponse) {
if (!response.Empty()) {
object_sp = StructuredData::ParseJSON(response.GetStringRef());
}
}
}
}
return object_sp;
}
StructuredData::ObjectSP ProcessGDBRemote::GetLoadedDynamicLibrariesInfos(
lldb::addr_t image_list_address, lldb::addr_t image_count) {
StructuredData::ObjectSP args_dict(new StructuredData::Dictionary());
args_dict->GetAsDictionary()->AddIntegerItem("image_list_address",
image_list_address);
args_dict->GetAsDictionary()->AddIntegerItem("image_count", image_count);
return GetLoadedDynamicLibrariesInfos_sender(args_dict);
}
StructuredData::ObjectSP ProcessGDBRemote::GetLoadedDynamicLibrariesInfos() {
StructuredData::ObjectSP args_dict(new StructuredData::Dictionary());
args_dict->GetAsDictionary()->AddBooleanItem("fetch_all_solibs", true);
return GetLoadedDynamicLibrariesInfos_sender(args_dict);
}
StructuredData::ObjectSP ProcessGDBRemote::GetLoadedDynamicLibrariesInfos(
const std::vector<lldb::addr_t> &load_addresses) {
StructuredData::ObjectSP args_dict(new StructuredData::Dictionary());
StructuredData::ArraySP addresses(new StructuredData::Array);
for (auto addr : load_addresses) {
StructuredData::ObjectSP addr_sp(new StructuredData::Integer(addr));
addresses->AddItem(addr_sp);
}
args_dict->GetAsDictionary()->AddItem("solib_addresses", addresses);
return GetLoadedDynamicLibrariesInfos_sender(args_dict);
}
StructuredData::ObjectSP
ProcessGDBRemote::GetLoadedDynamicLibrariesInfos_sender(
StructuredData::ObjectSP args_dict) {
StructuredData::ObjectSP object_sp;
if (m_gdb_comm.GetLoadedDynamicLibrariesInfosSupported()) {
// Scope for the scoped timeout object
GDBRemoteCommunication::ScopedTimeout timeout(m_gdb_comm,
std::chrono::seconds(10));
StreamString packet;
packet << "jGetLoadedDynamicLibrariesInfos:";
args_dict->Dump(packet, false);
// FIXME the final character of a JSON dictionary, '}', is the escape
// character in gdb-remote binary mode. lldb currently doesn't escape
// these characters in its packet output -- so we add the quoted version of
// the } character here manually in case we talk to a debugserver which un-
// escapes the characters at packet read time.
packet << (char)(0x7d ^ 0x20);
StringExtractorGDBRemote response;
response.SetResponseValidatorToJSON();
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
false) ==
GDBRemoteCommunication::PacketResult::Success) {
StringExtractorGDBRemote::ResponseType response_type =
response.GetResponseType();
if (response_type == StringExtractorGDBRemote::eResponse) {
if (!response.Empty()) {
object_sp = StructuredData::ParseJSON(response.GetStringRef());
}
}
}
}
return object_sp;
}
StructuredData::ObjectSP ProcessGDBRemote::GetSharedCacheInfo() {
StructuredData::ObjectSP object_sp;
StructuredData::ObjectSP args_dict(new StructuredData::Dictionary());
if (m_gdb_comm.GetSharedCacheInfoSupported()) {
StreamString packet;
packet << "jGetSharedCacheInfo:";
args_dict->Dump(packet, false);
// FIXME the final character of a JSON dictionary, '}', is the escape
// character in gdb-remote binary mode. lldb currently doesn't escape
// these characters in its packet output -- so we add the quoted version of
// the } character here manually in case we talk to a debugserver which un-
// escapes the characters at packet read time.
packet << (char)(0x7d ^ 0x20);
StringExtractorGDBRemote response;
response.SetResponseValidatorToJSON();
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
false) ==
GDBRemoteCommunication::PacketResult::Success) {
StringExtractorGDBRemote::ResponseType response_type =
response.GetResponseType();
if (response_type == StringExtractorGDBRemote::eResponse) {
if (!response.Empty()) {
object_sp = StructuredData::ParseJSON(response.GetStringRef());
}
}
}
}
return object_sp;
}
Status ProcessGDBRemote::ConfigureStructuredData(
const ConstString &type_name, const StructuredData::ObjectSP &config_sp) {
return m_gdb_comm.ConfigureRemoteStructuredData(type_name, config_sp);
}
// Establish the largest memory read/write payloads we should use. If the
// remote stub has a max packet size, stay under that size.
//
// If the remote stub's max packet size is crazy large, use a reasonable
// largeish default.
//
// If the remote stub doesn't advertise a max packet size, use a conservative
// default.
void ProcessGDBRemote::GetMaxMemorySize() {
const uint64_t reasonable_largeish_default = 128 * 1024;
const uint64_t conservative_default = 512;
if (m_max_memory_size == 0) {
uint64_t stub_max_size = m_gdb_comm.GetRemoteMaxPacketSize();
if (stub_max_size != UINT64_MAX && stub_max_size != 0) {
// Save the stub's claimed maximum packet size
m_remote_stub_max_memory_size = stub_max_size;
// Even if the stub says it can support ginormous packets, don't exceed
// our reasonable largeish default packet size.
if (stub_max_size > reasonable_largeish_default) {
stub_max_size = reasonable_largeish_default;
}
// Memory packet have other overheads too like Maddr,size:#NN Instead of
// calculating the bytes taken by size and addr every time, we take a
// maximum guess here.
if (stub_max_size > 70)
stub_max_size -= 32 + 32 + 6;
else {
// In unlikely scenario that max packet size is less then 70, we will
// hope that data being written is small enough to fit.
Log *log(ProcessGDBRemoteLog::GetLogIfAnyCategoryIsSet(
GDBR_LOG_COMM | GDBR_LOG_MEMORY));
if (log)
log->Warning("Packet size is too small. "
"LLDB may face problems while writing memory");
}
m_max_memory_size = stub_max_size;
} else {
m_max_memory_size = conservative_default;
}
}
}
void ProcessGDBRemote::SetUserSpecifiedMaxMemoryTransferSize(
uint64_t user_specified_max) {
if (user_specified_max != 0) {
GetMaxMemorySize();
if (m_remote_stub_max_memory_size != 0) {
if (m_remote_stub_max_memory_size < user_specified_max) {
m_max_memory_size = m_remote_stub_max_memory_size; // user specified a
// packet size too
// big, go as big
// as the remote stub says we can go.
} else {
m_max_memory_size = user_specified_max; // user's packet size is good
}
} else {
m_max_memory_size =
user_specified_max; // user's packet size is probably fine
}
}
}
bool ProcessGDBRemote::GetModuleSpec(const FileSpec &module_file_spec,
const ArchSpec &arch,
ModuleSpec &module_spec) {
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
const ModuleCacheKey key(module_file_spec.GetPath(),
arch.GetTriple().getTriple());
auto cached = m_cached_module_specs.find(key);
if (cached != m_cached_module_specs.end()) {
module_spec = cached->second;
return bool(module_spec);
}
if (!m_gdb_comm.GetModuleInfo(module_file_spec, arch, module_spec)) {
if (log)
log->Printf("ProcessGDBRemote::%s - failed to get module info for %s:%s",
__FUNCTION__, module_file_spec.GetPath().c_str(),
arch.GetTriple().getTriple().c_str());
return false;
}
if (log) {
StreamString stream;
module_spec.Dump(stream);
log->Printf("ProcessGDBRemote::%s - got module info for (%s:%s) : %s",
__FUNCTION__, module_file_spec.GetPath().c_str(),
arch.GetTriple().getTriple().c_str(), stream.GetData());
}
m_cached_module_specs[key] = module_spec;
return true;
}
void ProcessGDBRemote::PrefetchModuleSpecs(
llvm::ArrayRef<FileSpec> module_file_specs, const llvm::Triple &triple) {
auto module_specs = m_gdb_comm.GetModulesInfo(module_file_specs, triple);
if (module_specs) {
for (const FileSpec &spec : module_file_specs)
m_cached_module_specs[ModuleCacheKey(spec.GetPath(),
triple.getTriple())] = ModuleSpec();
for (const ModuleSpec &spec : *module_specs)
m_cached_module_specs[ModuleCacheKey(spec.GetFileSpec().GetPath(),
triple.getTriple())] = spec;
}
}
llvm::VersionTuple ProcessGDBRemote::GetHostOSVersion() {
return m_gdb_comm.GetOSVersion();
}
namespace {
typedef std::vector<std::string> stringVec;
typedef std::vector<struct GdbServerRegisterInfo> GDBServerRegisterVec;
struct RegisterSetInfo {
ConstString name;
};
typedef std::map<uint32_t, RegisterSetInfo> RegisterSetMap;
struct GdbServerTargetInfo {
std::string arch;
std::string osabi;
stringVec includes;
RegisterSetMap reg_set_map;
};
bool ParseRegisters(XMLNode feature_node, GdbServerTargetInfo &target_info,
GDBRemoteDynamicRegisterInfo &dyn_reg_info, ABISP abi_sp,
uint32_t &cur_reg_num, uint32_t &reg_offset) {
if (!feature_node)
return false;
feature_node.ForEachChildElementWithName(
"reg",
[&target_info, &dyn_reg_info, &cur_reg_num, &reg_offset,
&abi_sp](const XMLNode &reg_node) -> bool {
std::string gdb_group;
std::string gdb_type;
ConstString reg_name;
ConstString alt_name;
ConstString set_name;
std::vector<uint32_t> value_regs;
std::vector<uint32_t> invalidate_regs;
std::vector<uint8_t> dwarf_opcode_bytes;
bool encoding_set = false;
bool format_set = false;
RegisterInfo reg_info = {
NULL, // Name
NULL, // Alt name
0, // byte size
reg_offset, // offset
eEncodingUint, // encoding
eFormatHex, // format
{
LLDB_INVALID_REGNUM, // eh_frame reg num
LLDB_INVALID_REGNUM, // DWARF reg num
LLDB_INVALID_REGNUM, // generic reg num
cur_reg_num, // process plugin reg num
cur_reg_num // native register number
},
NULL,
NULL,
NULL, // Dwarf Expression opcode bytes pointer
0 // Dwarf Expression opcode bytes length
};
reg_node.ForEachAttribute([&target_info, &gdb_group, &gdb_type,
&reg_name, &alt_name, &set_name, &value_regs,
&invalidate_regs, &encoding_set, &format_set,
&reg_info, &reg_offset, &dwarf_opcode_bytes](
const llvm::StringRef &name,
const llvm::StringRef &value) -> bool {
if (name == "name") {
reg_name.SetString(value);
} else if (name == "bitsize") {
reg_info.byte_size =
StringConvert::ToUInt32(value.data(), 0, 0) / CHAR_BIT;
} else if (name == "type") {
gdb_type = value.str();
} else if (name == "group") {
gdb_group = value.str();
} else if (name == "regnum") {
const uint32_t regnum =
StringConvert::ToUInt32(value.data(), LLDB_INVALID_REGNUM, 0);
if (regnum != LLDB_INVALID_REGNUM) {
reg_info.kinds[eRegisterKindProcessPlugin] = regnum;
}
} else if (name == "offset") {
reg_offset = StringConvert::ToUInt32(value.data(), UINT32_MAX, 0);
} else if (name == "altname") {
alt_name.SetString(value);
} else if (name == "encoding") {
encoding_set = true;
reg_info.encoding = Args::StringToEncoding(value, eEncodingUint);
} else if (name == "format") {
format_set = true;
Format format = eFormatInvalid;
if (OptionArgParser::ToFormat(value.data(), format, NULL).Success())
reg_info.format = format;
else if (value == "vector-sint8")
reg_info.format = eFormatVectorOfSInt8;
else if (value == "vector-uint8")
reg_info.format = eFormatVectorOfUInt8;
else if (value == "vector-sint16")
reg_info.format = eFormatVectorOfSInt16;
else if (value == "vector-uint16")
reg_info.format = eFormatVectorOfUInt16;
else if (value == "vector-sint32")
reg_info.format = eFormatVectorOfSInt32;
else if (value == "vector-uint32")
reg_info.format = eFormatVectorOfUInt32;
else if (value == "vector-float32")
reg_info.format = eFormatVectorOfFloat32;
else if (value == "vector-uint64")
reg_info.format = eFormatVectorOfUInt64;
else if (value == "vector-uint128")
reg_info.format = eFormatVectorOfUInt128;
} else if (name == "group_id") {
const uint32_t set_id =
StringConvert::ToUInt32(value.data(), UINT32_MAX, 0);
RegisterSetMap::const_iterator pos =
target_info.reg_set_map.find(set_id);
if (pos != target_info.reg_set_map.end())
set_name = pos->second.name;
} else if (name == "gcc_regnum" || name == "ehframe_regnum") {
reg_info.kinds[eRegisterKindEHFrame] =
StringConvert::ToUInt32(value.data(), LLDB_INVALID_REGNUM, 0);
} else if (name == "dwarf_regnum") {
reg_info.kinds[eRegisterKindDWARF] =
StringConvert::ToUInt32(value.data(), LLDB_INVALID_REGNUM, 0);
} else if (name == "generic") {
reg_info.kinds[eRegisterKindGeneric] =
Args::StringToGenericRegister(value);
} else if (name == "value_regnums") {
SplitCommaSeparatedRegisterNumberString(value, value_regs, 0);
} else if (name == "invalidate_regnums") {
SplitCommaSeparatedRegisterNumberString(value, invalidate_regs, 0);
} else if (name == "dynamic_size_dwarf_expr_bytes") {
StringExtractor opcode_extractor;
std::string opcode_string = value.str();
size_t dwarf_opcode_len = opcode_string.length() / 2;
assert(dwarf_opcode_len > 0);
dwarf_opcode_bytes.resize(dwarf_opcode_len);
reg_info.dynamic_size_dwarf_len = dwarf_opcode_len;
opcode_extractor.GetStringRef().swap(opcode_string);
uint32_t ret_val =
opcode_extractor.GetHexBytesAvail(dwarf_opcode_bytes);
assert(dwarf_opcode_len == ret_val);
UNUSED_IF_ASSERT_DISABLED(ret_val);
reg_info.dynamic_size_dwarf_expr_bytes = dwarf_opcode_bytes.data();
} else {
printf("unhandled attribute %s = %s\n", name.data(), value.data());
}
return true; // Keep iterating through all attributes
});
if (!gdb_type.empty() && !(encoding_set || format_set)) {
if (gdb_type.find("int") == 0) {
reg_info.format = eFormatHex;
reg_info.encoding = eEncodingUint;
} else if (gdb_type == "data_ptr" || gdb_type == "code_ptr") {
reg_info.format = eFormatAddressInfo;
reg_info.encoding = eEncodingUint;
} else if (gdb_type == "i387_ext" || gdb_type == "float") {
reg_info.format = eFormatFloat;
reg_info.encoding = eEncodingIEEE754;
}
}
// Only update the register set name if we didn't get a "reg_set"
// attribute. "set_name" will be empty if we didn't have a "reg_set"
// attribute.
if (!set_name && !gdb_group.empty())
set_name.SetCString(gdb_group.c_str());
reg_info.byte_offset = reg_offset;
assert(reg_info.byte_size != 0);
reg_offset += reg_info.byte_size;
if (!value_regs.empty()) {
value_regs.push_back(LLDB_INVALID_REGNUM);
reg_info.value_regs = value_regs.data();
}
if (!invalidate_regs.empty()) {
invalidate_regs.push_back(LLDB_INVALID_REGNUM);
reg_info.invalidate_regs = invalidate_regs.data();
}
++cur_reg_num;
AugmentRegisterInfoViaABI(reg_info, reg_name, abi_sp);
dyn_reg_info.AddRegister(reg_info, reg_name, alt_name, set_name);
return true; // Keep iterating through all "reg" elements
});
return true;
}
} // namespace
// query the target of gdb-remote for extended target information return:
// 'true' on success
// 'false' on failure
bool ProcessGDBRemote::GetGDBServerRegisterInfo(ArchSpec &arch_to_use) {
// Make sure LLDB has an XML parser it can use first
if (!XMLDocument::XMLEnabled())
return false;
// redirect libxml2's error handler since the default prints to stdout
GDBRemoteCommunicationClient &comm = m_gdb_comm;
// check that we have extended feature read support
if (!comm.GetQXferFeaturesReadSupported())
return false;
// request the target xml file
std::string raw;
lldb_private::Status lldberr;
if (!comm.ReadExtFeature(ConstString("features"), ConstString("target.xml"),
raw, lldberr)) {
return false;
}
XMLDocument xml_document;
if (xml_document.ParseMemory(raw.c_str(), raw.size(), "target.xml")) {
GdbServerTargetInfo target_info;
XMLNode target_node = xml_document.GetRootElement("target");
if (target_node) {
std::vector<XMLNode> feature_nodes;
target_node.ForEachChildElement([&target_info, &feature_nodes](
const XMLNode &node) -> bool {
llvm::StringRef name = node.GetName();
if (name == "architecture") {
node.GetElementText(target_info.arch);
} else if (name == "osabi") {
node.GetElementText(target_info.osabi);
} else if (name == "xi:include" || name == "include") {
llvm::StringRef href = node.GetAttributeValue("href");
if (!href.empty())
target_info.includes.push_back(href.str());
} else if (name == "feature") {
feature_nodes.push_back(node);
} else if (name == "groups") {
node.ForEachChildElementWithName(
"group", [&target_info](const XMLNode &node) -> bool {
uint32_t set_id = UINT32_MAX;
RegisterSetInfo set_info;
node.ForEachAttribute(
[&set_id, &set_info](const llvm::StringRef &name,
const llvm::StringRef &value) -> bool {
if (name == "id")
set_id = StringConvert::ToUInt32(value.data(),
UINT32_MAX, 0);
if (name == "name")
set_info.name = ConstString(value);
return true; // Keep iterating through all attributes
});
if (set_id != UINT32_MAX)
target_info.reg_set_map[set_id] = set_info;
return true; // Keep iterating through all "group" elements
});
}
return true; // Keep iterating through all children of the target_node
});
// If the target.xml includes an architecture entry like
// <architecture>i386:x86-64</architecture> (seen from VMWare ESXi)
// <architecture>arm</architecture> (seen from Segger JLink on unspecified arm board)
// use that if we don't have anything better.
if (!arch_to_use.IsValid() && !target_info.arch.empty()) {
if (target_info.arch == "i386:x86-64") {
// We don't have any information about vendor or OS.
arch_to_use.SetTriple("x86_64--");
GetTarget().MergeArchitecture(arch_to_use);
}
// SEGGER J-Link jtag boards send this very-generic arch name,
// we'll need to use this if we have absolutely nothing better
// to work with or the register definitions won't be accepted.
if (target_info.arch == "arm") {
arch_to_use.SetTriple("arm--");
GetTarget().MergeArchitecture(arch_to_use);
}
}
// Initialize these outside of ParseRegisters, since they should not be
// reset inside each include feature
uint32_t cur_reg_num = 0;
uint32_t reg_offset = 0;
// Don't use Process::GetABI, this code gets called from DidAttach, and
// in that context we haven't set the Target's architecture yet, so the
// ABI is also potentially incorrect.
ABISP abi_to_use_sp = ABI::FindPlugin(shared_from_this(), arch_to_use);
for (auto &feature_node : feature_nodes) {
ParseRegisters(feature_node, target_info, this->m_register_info,
abi_to_use_sp, cur_reg_num, reg_offset);
}
for (const auto &include : target_info.includes) {
// request register file
std::string xml_data;
if (!comm.ReadExtFeature(ConstString("features"), ConstString(include),
xml_data, lldberr))
continue;
XMLDocument include_xml_document;
include_xml_document.ParseMemory(xml_data.data(), xml_data.size(),
include.c_str());
XMLNode include_feature_node =
include_xml_document.GetRootElement("feature");
if (include_feature_node) {
ParseRegisters(include_feature_node, target_info,
this->m_register_info, abi_to_use_sp, cur_reg_num,
reg_offset);
}
}
this->m_register_info.Finalize(arch_to_use);
}
}
return m_register_info.GetNumRegisters() > 0;
}
Status ProcessGDBRemote::GetLoadedModuleList(LoadedModuleInfoList &list) {
// Make sure LLDB has an XML parser it can use first
if (!XMLDocument::XMLEnabled())
return Status(0, ErrorType::eErrorTypeGeneric);
Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS);
if (log)
log->Printf("ProcessGDBRemote::%s", __FUNCTION__);
GDBRemoteCommunicationClient &comm = m_gdb_comm;
// check that we have extended feature read support
if (comm.GetQXferLibrariesSVR4ReadSupported()) {
list.clear();
// request the loaded library list
std::string raw;
lldb_private::Status lldberr;
if (!comm.ReadExtFeature(ConstString("libraries-svr4"), ConstString(""),
raw, lldberr))
return Status(0, ErrorType::eErrorTypeGeneric);
// parse the xml file in memory
if (log)
log->Printf("parsing: %s", raw.c_str());
XMLDocument doc;
if (!doc.ParseMemory(raw.c_str(), raw.size(), "noname.xml"))
return Status(0, ErrorType::eErrorTypeGeneric);
XMLNode root_element = doc.GetRootElement("library-list-svr4");
if (!root_element)
return Status();
// main link map structure
llvm::StringRef main_lm = root_element.GetAttributeValue("main-lm");
if (!main_lm.empty()) {
list.m_link_map =
StringConvert::ToUInt64(main_lm.data(), LLDB_INVALID_ADDRESS, 0);
}
root_element.ForEachChildElementWithName(
"library", [log, &list](const XMLNode &library) -> bool {
LoadedModuleInfoList::LoadedModuleInfo module;
library.ForEachAttribute(
[&module](const llvm::StringRef &name,
const llvm::StringRef &value) -> bool {
if (name == "name")
module.set_name(value.str());
else if (name == "lm") {
// the address of the link_map struct.
module.set_link_map(StringConvert::ToUInt64(
value.data(), LLDB_INVALID_ADDRESS, 0));
} else if (name == "l_addr") {
// the displacement as read from the field 'l_addr' of the
// link_map struct.
module.set_base(StringConvert::ToUInt64(
value.data(), LLDB_INVALID_ADDRESS, 0));
// base address is always a displacement, not an absolute
// value.
module.set_base_is_offset(true);
} else if (name == "l_ld") {
// the memory address of the libraries PT_DYAMIC section.
module.set_dynamic(StringConvert::ToUInt64(
value.data(), LLDB_INVALID_ADDRESS, 0));
}
return true; // Keep iterating over all properties of "library"
});
if (log) {
std::string name;
lldb::addr_t lm = 0, base = 0, ld = 0;
bool base_is_offset;
module.get_name(name);
module.get_link_map(lm);
module.get_base(base);
module.get_base_is_offset(base_is_offset);
module.get_dynamic(ld);
log->Printf("found (link_map:0x%08" PRIx64 ", base:0x%08" PRIx64
"[%s], ld:0x%08" PRIx64 ", name:'%s')",
lm, base, (base_is_offset ? "offset" : "absolute"), ld,
name.c_str());
}
list.add(module);
return true; // Keep iterating over all "library" elements in the root
// node
});
if (log)
log->Printf("found %" PRId32 " modules in total",
(int)list.m_list.size());
} else if (comm.GetQXferLibrariesReadSupported()) {
list.clear();
// request the loaded library list
std::string raw;
lldb_private::Status lldberr;
if (!comm.ReadExtFeature(ConstString("libraries"), ConstString(""), raw,
lldberr))
return Status(0, ErrorType::eErrorTypeGeneric);
if (log)
log->Printf("parsing: %s", raw.c_str());
XMLDocument doc;
if (!doc.ParseMemory(raw.c_str(), raw.size(), "noname.xml"))
return Status(0, ErrorType::eErrorTypeGeneric);
XMLNode root_element = doc.GetRootElement("library-list");
if (!root_element)
return Status();
root_element.ForEachChildElementWithName(
"library", [log, &list](const XMLNode &library) -> bool {
LoadedModuleInfoList::LoadedModuleInfo module;
llvm::StringRef name = library.GetAttributeValue("name");
module.set_name(name.str());
// The base address of a given library will be the address of its
// first section. Most remotes send only one section for Windows
// targets for example.
const XMLNode &section =
library.FindFirstChildElementWithName("section");
llvm::StringRef address = section.GetAttributeValue("address");
module.set_base(
StringConvert::ToUInt64(address.data(), LLDB_INVALID_ADDRESS, 0));
// These addresses are absolute values.
module.set_base_is_offset(false);
if (log) {
std::string name;
lldb::addr_t base = 0;
bool base_is_offset;
module.get_name(name);
module.get_base(base);
module.get_base_is_offset(base_is_offset);
log->Printf("found (base:0x%08" PRIx64 "[%s], name:'%s')", base,
(base_is_offset ? "offset" : "absolute"), name.c_str());
}
list.add(module);
return true; // Keep iterating over all "library" elements in the root
// node
});
if (log)
log->Printf("found %" PRId32 " modules in total",
(int)list.m_list.size());
} else {
return Status(0, ErrorType::eErrorTypeGeneric);
}
return Status();
}
lldb::ModuleSP ProcessGDBRemote::LoadModuleAtAddress(const FileSpec &file,
lldb::addr_t link_map,
lldb::addr_t base_addr,
bool value_is_offset) {
DynamicLoader *loader = GetDynamicLoader();
if (!loader)
return nullptr;
return loader->LoadModuleAtAddress(file, link_map, base_addr,
value_is_offset);
}
size_t ProcessGDBRemote::LoadModules(LoadedModuleInfoList &module_list) {
using lldb_private::process_gdb_remote::ProcessGDBRemote;
// request a list of loaded libraries from GDBServer
if (GetLoadedModuleList(module_list).Fail())
return 0;
// get a list of all the modules
ModuleList new_modules;
for (LoadedModuleInfoList::LoadedModuleInfo &modInfo : module_list.m_list) {
std::string mod_name;
lldb::addr_t mod_base;
lldb::addr_t link_map;
bool mod_base_is_offset;
bool valid = true;
valid &= modInfo.get_name(mod_name);
valid &= modInfo.get_base(mod_base);
valid &= modInfo.get_base_is_offset(mod_base_is_offset);
if (!valid)
continue;
if (!modInfo.get_link_map(link_map))
link_map = LLDB_INVALID_ADDRESS;
FileSpec file(mod_name);
FileSystem::Instance().Resolve(file);
lldb::ModuleSP module_sp =
LoadModuleAtAddress(file, link_map, mod_base, mod_base_is_offset);
if (module_sp.get())
new_modules.Append(module_sp);
}
if (new_modules.GetSize() > 0) {
ModuleList removed_modules;
Target &target = GetTarget();
ModuleList &loaded_modules = m_process->GetTarget().GetImages();
for (size_t i = 0; i < loaded_modules.GetSize(); ++i) {
const lldb::ModuleSP loaded_module = loaded_modules.GetModuleAtIndex(i);
bool found = false;
for (size_t j = 0; j < new_modules.GetSize(); ++j) {
if (new_modules.GetModuleAtIndex(j).get() == loaded_module.get())
found = true;
}
// The main executable will never be included in libraries-svr4, don't
// remove it
if (!found &&
loaded_module.get() != target.GetExecutableModulePointer()) {
removed_modules.Append(loaded_module);
}
}
loaded_modules.Remove(removed_modules);
m_process->GetTarget().ModulesDidUnload(removed_modules, false);
new_modules.ForEach([&target](const lldb::ModuleSP module_sp) -> bool {
lldb_private::ObjectFile *obj = module_sp->GetObjectFile();
if (!obj)
return true;
if (obj->GetType() != ObjectFile::Type::eTypeExecutable)
return true;
lldb::ModuleSP module_copy_sp = module_sp;
target.SetExecutableModule(module_copy_sp, eLoadDependentsNo);
return false;
});
loaded_modules.AppendIfNeeded(new_modules);
m_process->GetTarget().ModulesDidLoad(new_modules);
}
return new_modules.GetSize();
}
size_t ProcessGDBRemote::LoadModules() {
LoadedModuleInfoList module_list;
return LoadModules(module_list);
}
Status ProcessGDBRemote::GetFileLoadAddress(const FileSpec &file,
bool &is_loaded,
lldb::addr_t &load_addr) {
is_loaded = false;
load_addr = LLDB_INVALID_ADDRESS;
std::string file_path = file.GetPath(false);
if (file_path.empty())
return Status("Empty file name specified");
StreamString packet;
packet.PutCString("qFileLoadAddress:");
packet.PutCStringAsRawHex8(file_path.c_str());
StringExtractorGDBRemote response;
if (m_gdb_comm.SendPacketAndWaitForResponse(packet.GetString(), response,
false) !=
GDBRemoteCommunication::PacketResult::Success)
return Status("Sending qFileLoadAddress packet failed");
if (response.IsErrorResponse()) {
if (response.GetError() == 1) {
// The file is not loaded into the inferior
is_loaded = false;
load_addr = LLDB_INVALID_ADDRESS;
return Status();
}
return Status(
"Fetching file load address from remote server returned an error");
}
if (response.IsNormalResponse()) {
is_loaded = true;
load_addr = response.GetHexMaxU64(false, LLDB_INVALID_ADDRESS);
return Status();
}
return Status(
"Unknown error happened during sending the load address packet");
}
void ProcessGDBRemote::ModulesDidLoad(ModuleList &module_list) {
// We must call the lldb_private::Process::ModulesDidLoad () first before we
// do anything
Process::ModulesDidLoad(module_list);
// After loading shared libraries, we can ask our remote GDB server if it
// needs any symbols.
m_gdb_comm.ServeSymbolLookups(this);
}
void ProcessGDBRemote::HandleAsyncStdout(llvm::StringRef out) {
AppendSTDOUT(out.data(), out.size());
}
static const char *end_delimiter = "--end--;";
static const int end_delimiter_len = 8;
void ProcessGDBRemote::HandleAsyncMisc(llvm::StringRef data) {
std::string input = data.str(); // '1' to move beyond 'A'
if (m_partial_profile_data.length() > 0) {
m_partial_profile_data.append(input);
input = m_partial_profile_data;
m_partial_profile_data.clear();
}
size_t found, pos = 0, len = input.length();
while ((found = input.find(end_delimiter, pos)) != std::string::npos) {
StringExtractorGDBRemote profileDataExtractor(
input.substr(pos, found).c_str());
std::string profile_data =
HarmonizeThreadIdsForProfileData(profileDataExtractor);
BroadcastAsyncProfileData(profile_data);
pos = found + end_delimiter_len;
}
if (pos < len) {
// Last incomplete chunk.
m_partial_profile_data = input.substr(pos);
}
}
std::string ProcessGDBRemote::HarmonizeThreadIdsForProfileData(
StringExtractorGDBRemote &profileDataExtractor) {
std::map<uint64_t, uint32_t> new_thread_id_to_used_usec_map;
std::string output;
llvm::raw_string_ostream output_stream(output);
llvm::StringRef name, value;
// Going to assuming thread_used_usec comes first, else bail out.
while (profileDataExtractor.GetNameColonValue(name, value)) {
if (name.compare("thread_used_id") == 0) {
StringExtractor threadIDHexExtractor(value);
uint64_t thread_id = threadIDHexExtractor.GetHexMaxU64(false, 0);
bool has_used_usec = false;
uint32_t curr_used_usec = 0;
llvm::StringRef usec_name, usec_value;
uint32_t input_file_pos = profileDataExtractor.GetFilePos();
if (profileDataExtractor.GetNameColonValue(usec_name, usec_value)) {
if (usec_name.equals("thread_used_usec")) {
has_used_usec = true;
usec_value.getAsInteger(0, curr_used_usec);
} else {
// We didn't find what we want, it is probably an older version. Bail
// out.
profileDataExtractor.SetFilePos(input_file_pos);
}
}
if (has_used_usec) {
uint32_t prev_used_usec = 0;
std::map<uint64_t, uint32_t>::iterator iterator =
m_thread_id_to_used_usec_map.find(thread_id);
if (iterator != m_thread_id_to_used_usec_map.end()) {
prev_used_usec = m_thread_id_to_used_usec_map[thread_id];
}
uint32_t real_used_usec = curr_used_usec - prev_used_usec;
// A good first time record is one that runs for at least 0.25 sec
bool good_first_time =
(prev_used_usec == 0) && (real_used_usec > 250000);
bool good_subsequent_time =
(prev_used_usec > 0) &&
((real_used_usec > 0) || (HasAssignedIndexIDToThread(thread_id)));
if (good_first_time || good_subsequent_time) {
// We try to avoid doing too many index id reservation, resulting in
// fast increase of index ids.
output_stream << name << ":";
int32_t index_id = AssignIndexIDToThread(thread_id);
output_stream << index_id << ";";
output_stream << usec_name << ":" << usec_value << ";";
} else {
// Skip past 'thread_used_name'.
llvm::StringRef local_name, local_value;
profileDataExtractor.GetNameColonValue(local_name, local_value);
}
// Store current time as previous time so that they can be compared
// later.
new_thread_id_to_used_usec_map[thread_id] = curr_used_usec;
} else {
// Bail out and use old string.
output_stream << name << ":" << value << ";";
}
} else {
output_stream << name << ":" << value << ";";
}
}
output_stream << end_delimiter;
m_thread_id_to_used_usec_map = new_thread_id_to_used_usec_map;
return output_stream.str();
}
void ProcessGDBRemote::HandleStopReply() {
if (GetStopID() != 0)
return;
if (GetID() == LLDB_INVALID_PROCESS_ID) {
lldb::pid_t pid = m_gdb_comm.GetCurrentProcessID();
if (pid != LLDB_INVALID_PROCESS_ID)
SetID(pid);
}
BuildDynamicRegisterInfo(true);
}
static const char *const s_async_json_packet_prefix = "JSON-async:";
static StructuredData::ObjectSP
ParseStructuredDataPacket(llvm::StringRef packet) {
Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
if (!packet.consume_front(s_async_json_packet_prefix)) {
if (log) {
log->Printf(
"GDBRemoteCommunicationClientBase::%s() received $J packet "
"but was not a StructuredData packet: packet starts with "
"%s",
__FUNCTION__,
packet.slice(0, strlen(s_async_json_packet_prefix)).str().c_str());
}
return StructuredData::ObjectSP();
}
// This is an asynchronous JSON packet, destined for a StructuredDataPlugin.
StructuredData::ObjectSP json_sp = StructuredData::ParseJSON(packet);
if (log) {
if (json_sp) {
StreamString json_str;
json_sp->Dump(json_str);
json_str.Flush();
log->Printf("ProcessGDBRemote::%s() "
"received Async StructuredData packet: %s",
__FUNCTION__, json_str.GetData());
} else {
log->Printf("ProcessGDBRemote::%s"
"() received StructuredData packet:"
" parse failure",
__FUNCTION__);
}
}
return json_sp;
}
void ProcessGDBRemote::HandleAsyncStructuredDataPacket(llvm::StringRef data) {
auto structured_data_sp = ParseStructuredDataPacket(data);
if (structured_data_sp)
RouteAsyncStructuredData(structured_data_sp);
}
class CommandObjectProcessGDBRemoteSpeedTest : public CommandObjectParsed {
public:
CommandObjectProcessGDBRemoteSpeedTest(CommandInterpreter &interpreter)
: CommandObjectParsed(interpreter, "process plugin packet speed-test",
"Tests packet speeds of various sizes to determine "
"the performance characteristics of the GDB remote "
"connection. ",
NULL),
m_option_group(),
m_num_packets(LLDB_OPT_SET_1, false, "count", 'c', 0, eArgTypeCount,
"The number of packets to send of each varying size "
"(default is 1000).",
1000),
m_max_send(LLDB_OPT_SET_1, false, "max-send", 's', 0, eArgTypeCount,
"The maximum number of bytes to send in a packet. Sizes "
"increase in powers of 2 while the size is less than or "
"equal to this option value. (default 1024).",
1024),
m_max_recv(LLDB_OPT_SET_1, false, "max-receive", 'r', 0, eArgTypeCount,
"The maximum number of bytes to receive in a packet. Sizes "
"increase in powers of 2 while the size is less than or "
"equal to this option value. (default 1024).",
1024),
m_json(LLDB_OPT_SET_1, false, "json", 'j',
"Print the output as JSON data for easy parsing.", false, true) {
m_option_group.Append(&m_num_packets, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Append(&m_max_send, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Append(&m_max_recv, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Append(&m_json, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
m_option_group.Finalize();
}
~CommandObjectProcessGDBRemoteSpeedTest() {}
Options *GetOptions() override { return &m_option_group; }
bool DoExecute(Args &command, CommandReturnObject &result) override {
const size_t argc = command.GetArgumentCount();
if (argc == 0) {
ProcessGDBRemote *process =
(ProcessGDBRemote *)m_interpreter.GetExecutionContext()
.GetProcessPtr();
if (process) {
StreamSP output_stream_sp(
m_interpreter.GetDebugger().GetAsyncOutputStream());
result.SetImmediateOutputStream(output_stream_sp);
const uint32_t num_packets =
(uint32_t)m_num_packets.GetOptionValue().GetCurrentValue();
const uint64_t max_send = m_max_send.GetOptionValue().GetCurrentValue();
const uint64_t max_recv = m_max_recv.GetOptionValue().GetCurrentValue();
const bool json = m_json.GetOptionValue().GetCurrentValue();
const uint64_t k_recv_amount =
4 * 1024 * 1024; // Receive amount in bytes
process->GetGDBRemote().TestPacketSpeed(
num_packets, max_send, max_recv, k_recv_amount, json,
output_stream_sp ? *output_stream_sp : result.GetOutputStream());
result.SetStatus(eReturnStatusSuccessFinishResult);
return true;
}
} else {
result.AppendErrorWithFormat("'%s' takes no arguments",
m_cmd_name.c_str());
}
result.SetStatus(eReturnStatusFailed);
return false;
}
protected:
OptionGroupOptions m_option_group;
OptionGroupUInt64 m_num_packets;
OptionGroupUInt64 m_max_send;
OptionGroupUInt64 m_max_recv;
OptionGroupBoolean m_json;
};
class CommandObjectProcessGDBRemotePacketHistory : public CommandObjectParsed {
private:
public:
CommandObjectProcessGDBRemotePacketHistory(CommandInterpreter &interpreter)
: CommandObjectParsed(interpreter, "process plugin packet history",
"Dumps the packet history buffer. ", NULL) {}
~CommandObjectProcessGDBRemotePacketHistory() {}
bool DoExecute(Args &command, CommandReturnObject &result) override {
const size_t argc = command.GetArgumentCount();
if (argc == 0) {
ProcessGDBRemote *process =
(ProcessGDBRemote *)m_interpreter.GetExecutionContext()
.GetProcessPtr();
if (process) {
process->GetGDBRemote().DumpHistory(result.GetOutputStream());
result.SetStatus(eReturnStatusSuccessFinishResult);
return true;
}
} else {
result.AppendErrorWithFormat("'%s' takes no arguments",
m_cmd_name.c_str());
}
result.SetStatus(eReturnStatusFailed);
return false;
}
};
class CommandObjectProcessGDBRemotePacketXferSize : public CommandObjectParsed {
private:
public:
CommandObjectProcessGDBRemotePacketXferSize(CommandInterpreter &interpreter)
: CommandObjectParsed(
interpreter, "process plugin packet xfer-size",
"Maximum size that lldb will try to read/write one one chunk.",
NULL) {}
~CommandObjectProcessGDBRemotePacketXferSize() {}
bool DoExecute(Args &command, CommandReturnObject &result) override {
const size_t argc = command.GetArgumentCount();
if (argc == 0) {
result.AppendErrorWithFormat("'%s' takes an argument to specify the max "
"amount to be transferred when "
"reading/writing",
m_cmd_name.c_str());
result.SetStatus(eReturnStatusFailed);
return false;
}
ProcessGDBRemote *process =
(ProcessGDBRemote *)m_interpreter.GetExecutionContext().GetProcessPtr();
if (process) {
const char *packet_size = command.GetArgumentAtIndex(0);
errno = 0;
uint64_t user_specified_max = strtoul(packet_size, NULL, 10);
if (errno == 0 && user_specified_max != 0) {
process->SetUserSpecifiedMaxMemoryTransferSize(user_specified_max);
result.SetStatus(eReturnStatusSuccessFinishResult);
return true;
}
}
result.SetStatus(eReturnStatusFailed);
return false;
}
};
class CommandObjectProcessGDBRemotePacketSend : public CommandObjectParsed {
private:
public:
CommandObjectProcessGDBRemotePacketSend(CommandInterpreter &interpreter)
: CommandObjectParsed(interpreter, "process plugin packet send",
"Send a custom packet through the GDB remote "
"protocol and print the answer. "
"The packet header and footer will automatically "
"be added to the packet prior to sending and "
"stripped from the result.",
NULL) {}
~CommandObjectProcessGDBRemotePacketSend() {}
bool DoExecute(Args &command, CommandReturnObject &result) override {
const size_t argc = command.GetArgumentCount();
if (argc == 0) {
result.AppendErrorWithFormat(
"'%s' takes a one or more packet content arguments",
m_cmd_name.c_str());
result.SetStatus(eReturnStatusFailed);
return false;
}
ProcessGDBRemote *process =
(ProcessGDBRemote *)m_interpreter.GetExecutionContext().GetProcessPtr();
if (process) {
for (size_t i = 0; i < argc; ++i) {
const char *packet_cstr = command.GetArgumentAtIndex(0);
bool send_async = true;
StringExtractorGDBRemote response;
process->GetGDBRemote().SendPacketAndWaitForResponse(
packet_cstr, response, send_async);
result.SetStatus(eReturnStatusSuccessFinishResult);
Stream &output_strm = result.GetOutputStream();
output_strm.Printf(" packet: %s\n", packet_cstr);
std::string &response_str = response.GetStringRef();
if (strstr(packet_cstr, "qGetProfileData") != NULL) {
response_str = process->HarmonizeThreadIdsForProfileData(response);
}
if (response_str.empty())
output_strm.PutCString("response: \nerror: UNIMPLEMENTED\n");
else
output_strm.Printf("response: %s\n", response.GetStringRef().c_str());
}
}
return true;
}
};
class CommandObjectProcessGDBRemotePacketMonitor : public CommandObjectRaw {
private:
public:
CommandObjectProcessGDBRemotePacketMonitor(CommandInterpreter &interpreter)
: CommandObjectRaw(interpreter, "process plugin packet monitor",
"Send a qRcmd packet through the GDB remote protocol "
"and print the response."
"The argument passed to this command will be hex "
"encoded into a valid 'qRcmd' packet, sent and the "
"response will be printed.") {}
~CommandObjectProcessGDBRemotePacketMonitor() {}
bool DoExecute(llvm::StringRef command,
CommandReturnObject &result) override {
if (command.empty()) {
result.AppendErrorWithFormat("'%s' takes a command string argument",
m_cmd_name.c_str());
result.SetStatus(eReturnStatusFailed);
return false;
}
ProcessGDBRemote *process =
(ProcessGDBRemote *)m_interpreter.GetExecutionContext().GetProcessPtr();
if (process) {
StreamString packet;
packet.PutCString("qRcmd,");
packet.PutBytesAsRawHex8(command.data(), command.size());
bool send_async = true;
StringExtractorGDBRemote response;
Stream &output_strm = result.GetOutputStream();
process->GetGDBRemote().SendPacketAndReceiveResponseWithOutputSupport(
packet.GetString(), response, send_async,
[&output_strm](llvm::StringRef output) { output_strm << output; });
result.SetStatus(eReturnStatusSuccessFinishResult);
output_strm.Printf(" packet: %s\n", packet.GetData());
const std::string &response_str = response.GetStringRef();
if (response_str.empty())
output_strm.PutCString("response: \nerror: UNIMPLEMENTED\n");
else
output_strm.Printf("response: %s\n", response.GetStringRef().c_str());
}
return true;
}
};
class CommandObjectProcessGDBRemotePacket : public CommandObjectMultiword {
private:
public:
CommandObjectProcessGDBRemotePacket(CommandInterpreter &interpreter)
: CommandObjectMultiword(interpreter, "process plugin packet",
"Commands that deal with GDB remote packets.",
NULL) {
LoadSubCommand(
"history",
CommandObjectSP(
new CommandObjectProcessGDBRemotePacketHistory(interpreter)));
LoadSubCommand(
"send", CommandObjectSP(
new CommandObjectProcessGDBRemotePacketSend(interpreter)));
LoadSubCommand(
"monitor",
CommandObjectSP(
new CommandObjectProcessGDBRemotePacketMonitor(interpreter)));
LoadSubCommand(
"xfer-size",
CommandObjectSP(
new CommandObjectProcessGDBRemotePacketXferSize(interpreter)));
LoadSubCommand("speed-test",
CommandObjectSP(new CommandObjectProcessGDBRemoteSpeedTest(
interpreter)));
}
~CommandObjectProcessGDBRemotePacket() {}
};
class CommandObjectMultiwordProcessGDBRemote : public CommandObjectMultiword {
public:
CommandObjectMultiwordProcessGDBRemote(CommandInterpreter &interpreter)
: CommandObjectMultiword(
interpreter, "process plugin",
"Commands for operating on a ProcessGDBRemote process.",
"process plugin <subcommand> [<subcommand-options>]") {
LoadSubCommand(
"packet",
CommandObjectSP(new CommandObjectProcessGDBRemotePacket(interpreter)));
}
~CommandObjectMultiwordProcessGDBRemote() {}
};
CommandObject *ProcessGDBRemote::GetPluginCommandObject() {
if (!m_command_sp)
m_command_sp.reset(new CommandObjectMultiwordProcessGDBRemote(
GetTarget().GetDebugger().GetCommandInterpreter()));
return m_command_sp.get();
}
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