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//===-- TargetThreadWindows.cpp----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/HostNativeThreadBase.h"
#include "lldb/Host/windows/HostThreadWindows.h"
#include "lldb/Host/windows/windows.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Logging.h"
#include "lldb/Utility/State.h"
#include "Plugins/Process/Utility/UnwindLLDB.h"
#include "ProcessWindows.h"
#include "ProcessWindowsLog.h"
#include "TargetThreadWindows.h"
#if defined(_WIN64)
#include "x64/RegisterContextWindows_x64.h"
#else
#include "x86/RegisterContextWindows_x86.h"
#endif
using namespace lldb;
using namespace lldb_private;
TargetThreadWindows::TargetThreadWindows(ProcessWindows &process,
const HostThread &thread)
: Thread(process, thread.GetNativeThread().GetThreadId()),
m_thread_reg_ctx_sp(), m_host_thread(thread) {}
TargetThreadWindows::~TargetThreadWindows() { DestroyThread(); }
void TargetThreadWindows::RefreshStateAfterStop() {
::SuspendThread(m_host_thread.GetNativeThread().GetSystemHandle());
SetState(eStateStopped);
GetRegisterContext()->InvalidateIfNeeded(false);
}
void TargetThreadWindows::WillResume(lldb::StateType resume_state) {}
void TargetThreadWindows::DidStop() {}
RegisterContextSP TargetThreadWindows::GetRegisterContext() {
if (!m_reg_context_sp)
m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
return m_reg_context_sp;
}
RegisterContextSP
TargetThreadWindows::CreateRegisterContextForFrame(StackFrame *frame) {
RegisterContextSP reg_ctx_sp;
uint32_t concrete_frame_idx = 0;
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
if (frame)
concrete_frame_idx = frame->GetConcreteFrameIndex();
if (concrete_frame_idx == 0) {
if (!m_thread_reg_ctx_sp) {
ArchSpec arch = HostInfo::GetArchitecture();
switch (arch.GetMachine()) {
case llvm::Triple::x86:
#if defined(_WIN64)
// FIXME: This is a Wow64 process, create a RegisterContextWindows_Wow64
LLDB_LOG(log, "This is a Wow64 process, we should create a "
"RegisterContextWindows_Wow64, but we don't.");
#else
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_x86(*this, concrete_frame_idx));
#endif
break;
case llvm::Triple::x86_64:
#if defined(_WIN64)
m_thread_reg_ctx_sp.reset(
new RegisterContextWindows_x64(*this, concrete_frame_idx));
#else
LLDB_LOG(log, "LLDB is 32-bit, but the target process is 64-bit.");
#endif
default:
break;
}
}
reg_ctx_sp = m_thread_reg_ctx_sp;
} else {
Unwind *unwinder = GetUnwinder();
if (unwinder != nullptr)
reg_ctx_sp = unwinder->CreateRegisterContextForFrame(frame);
}
return reg_ctx_sp;
}
bool TargetThreadWindows::CalculateStopInfo() {
SetStopInfo(m_stop_info_sp);
return true;
}
Unwind *TargetThreadWindows::GetUnwinder() {
// FIXME: Implement an unwinder based on the Windows unwinder exposed through
// DIA SDK.
if (!m_unwinder_ap)
m_unwinder_ap.reset(new UnwindLLDB(*this));
return m_unwinder_ap.get();
}
Status TargetThreadWindows::DoResume() {
StateType resume_state = GetTemporaryResumeState();
StateType current_state = GetState();
if (resume_state == current_state)
return Status();
if (resume_state == eStateStepping) {
uint32_t flags_index =
GetRegisterContext()->ConvertRegisterKindToRegisterNumber(
eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
uint64_t flags_value =
GetRegisterContext()->ReadRegisterAsUnsigned(flags_index, 0);
flags_value |= 0x100; // Set the trap flag on the CPU
GetRegisterContext()->WriteRegisterFromUnsigned(flags_index, flags_value);
}
if (resume_state == eStateStepping || resume_state == eStateRunning) {
DWORD previous_suspend_count = 0;
HANDLE thread_handle = m_host_thread.GetNativeThread().GetSystemHandle();
do {
// ResumeThread returns -1 on error, or the thread's *previous* suspend
// count on success. This means that the return value is 1 when the thread
// was restarted. Note that DWORD is an unsigned int, so we need to
// explicitly compare with -1.
previous_suspend_count = ::ResumeThread(thread_handle);
if (previous_suspend_count == (DWORD)-1)
return Status(::GetLastError(), eErrorTypeWin32);
} while (previous_suspend_count > 1);
}
return Status();
}
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