reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152
  153
  154
  155
  156
  157
  158
  159
  160
  161
  162
  163
  164
  165
  166
  167
  168
  169
  170
//===-- 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(__x86_64__) || defined(_M_AMD64)
#include "x64/RegisterContextWindows_x64.h"
#elif defined(__i386__) || defined(_M_IX86)
#include "x86/RegisterContextWindows_x86.h"
#elif defined(__aarch64__) || defined(_M_ARM64)
#include "arm64/RegisterContextWindows_arm64.h"
#elif defined(__arm__) || defined(_M_ARM)
#include "arm/RegisterContextWindows_arm.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::arm:
      case llvm::Triple::thumb:
#if defined(__arm__) || defined(_M_ARM)
        m_thread_reg_ctx_sp.reset(
            new RegisterContextWindows_arm(*this, concrete_frame_idx));
#else
        LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
        break;

      case llvm::Triple::aarch64:
#if defined(__aarch64__) || defined(_M_ARM64)
        m_thread_reg_ctx_sp.reset(
            new RegisterContextWindows_arm64(*this, concrete_frame_idx));
#else
        LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
        break;

      case llvm::Triple::x86:
#if defined(__i386__) || defined(_M_IX86)
        m_thread_reg_ctx_sp.reset(
            new RegisterContextWindows_x86(*this, concrete_frame_idx));
#else
        LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
        break;

      case llvm::Triple::x86_64:
#if defined(__x86_64__) || defined(_M_AMD64)
        m_thread_reg_ctx_sp.reset(
            new RegisterContextWindows_x64(*this, concrete_frame_idx));
#else
        LLDB_LOG(log, "debugging foreign targets is currently unsupported");
#endif
        break;

      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_up)
    m_unwinder_up.reset(new UnwindLLDB(*this));
  return m_unwinder_up.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();
}