public static Win32HardwareBreakpoint TrySet(SafeObjectHandle threadHandle,
HardwareBreakpointType type, HardwareBreakpointSize size, IntPtr address)
{
if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows) || IntPtr.Size != 8)
{
throw new PlatformNotSupportedException("Only 64 bit Windows is supported");
}
var breakpoint = new Win32HardwareBreakpoint {
Address = address,
Size = size,
Type = type,
ThreadHandle = threadHandle
};
bool self = threadHandle.DangerousGetHandle() == Win32Thread.GetCurrentThread().DangerousGetHandle();
if (self)
{
int threadID = GetCurrentThreadId();
breakpoint.ThreadHandle = Win32Thread.OpenThread(ThreadAccess.All, inheritHandle: false, threadID: threadID);
if (breakpoint.ThreadHandle.IsInvalid)
{
throw new Win32Exception();
}
}
breakpoint.CompletionEvent = Win32Event.CreateEvent(IntPtr.Zero, manualReset: false, initialState: false, name: null);
breakpoint.Op = Operation.Set;
Win32Thread.ThreadProc threadProc = Win32HardwareBreakpoint.th;
var th = Marshal.GetFunctionPointerForDelegate(threadProc);
var h = GCHandle.Alloc(breakpoint);
if (Win32Thread.CreateThread(IntPtr.Zero, UIntPtr.Zero, th,
parameter: (IntPtr)h, creationFlags: 0, out int _).IsInvalid)
{
throw new Win32Exception();
}
WaitForSingleObject(breakpoint.CompletionEvent, dwMilliseconds: Constants.INFINITE);
breakpoint.CompletionEvent.Dispose();
if (self)
{
breakpoint.ThreadHandle.Dispose();
}
breakpoint.ThreadHandle = threadHandle;
if (!breakpoint.SUCC)
{
h.Free();
return(null);
}
breakpoint.gcHandle = h;
GC.KeepAlive(threadProc);
return(breakpoint);
}
static void Remove(GCHandle handle)
{
if (!handle.IsAllocated)
{
throw new ArgumentNullException(nameof(handle));
}
var breakpoint = (Win32HardwareBreakpoint)handle.Target;
bool isSelf = false;
if (breakpoint.ThreadHandle.DangerousGetHandle() == Win32Thread.GetCurrentThread().DangerousGetHandle())
{
int threadID = GetCurrentThreadId();
breakpoint.ThreadHandle = Win32Thread.OpenThread(ThreadAccess.All, inheritHandle: false, threadID);
if (breakpoint.ThreadHandle.IsInvalid)
{
throw new Win32Exception();
}
isSelf = true;
}
breakpoint.CompletionEvent = Win32Event.CreateEvent(IntPtr.Zero, manualReset: false, initialState: false, name: null);
breakpoint.Op = Operation.Remove;
Win32Thread.ThreadProc threadProc = Win32HardwareBreakpoint.th;
var th = Marshal.GetFunctionPointerForDelegate(threadProc);
if (Win32Thread.CreateThread(IntPtr.Zero, UIntPtr.Zero, th, (IntPtr)handle, 0, out int _).IsInvalid)
{
throw new Win32Exception();
}
WaitForSingleObject(breakpoint.CompletionEvent, Constants.INFINITE);
breakpoint.CompletionEvent.Dispose();
if (isSelf)
{
breakpoint.ThreadHandle.Dispose();
}
handle.Free();
}
static int th(IntPtr lpParameter)
{
if (lpParameter == IntPtr.Zero)
{
throw new ArgumentNullException(nameof(lpParameter));
}
var breakpoint = (Win32HardwareBreakpoint)GCHandle.FromIntPtr(lpParameter).Target;
int threadOpResult = SuspendThread(breakpoint.ThreadHandle);
GetLastError().ThrowOnError();
var ct = new Win32ThreadContext {
ContextFlags = ContextFlags.DebugRegisters,
};
Win32ThreadContext.Get(breakpoint.ThreadHandle, ref ct);
GetLastError().ThrowOnError();
int FlagBit = 0;
bool Dr0Busy = false;
bool Dr1Busy = false;
bool Dr2Busy = false;
bool Dr3Busy = false;
if (((ulong)ct.Dr7 & 1) != 0)
{
Dr0Busy = true;
}
if (((ulong)ct.Dr7 & 4) != 0)
{
Dr1Busy = true;
}
if (((ulong)ct.Dr7 & 16) != 0)
{
Dr2Busy = true;
}
if (((ulong)ct.Dr7 & 64) != 0)
{
Dr3Busy = true;
}
if (breakpoint.Op == Operation.Remove)
{
// Remove
if (breakpoint.iReg == 0)
{
FlagBit = 0;
ct.Dr0 = IntPtr.Zero;
Dr0Busy = false;
}
if (breakpoint.iReg == 1)
{
FlagBit = 2;
ct.Dr1 = IntPtr.Zero;;
Dr1Busy = false;
}
if (breakpoint.iReg == 2)
{
FlagBit = 4;
ct.Dr2 = IntPtr.Zero;;
Dr2Busy = false;
}
if (breakpoint.iReg == 3)
{
FlagBit = 6;
ct.Dr3 = IntPtr.Zero;;
Dr3Busy = false;
}
if (IntPtr.Size == 8)
{
ulong v = (ulong)ct.Dr7;
v &= ~(1ul << FlagBit);
ct.Dr7 = (IntPtr)v;
}
}
else
{
if (!Dr0Busy)
{
breakpoint.iReg = 0;
ct.Dr0 = breakpoint.Address;
Dr0Busy = true;
}
else
if (!Dr1Busy)
{
breakpoint.iReg = 1;
ct.Dr1 = breakpoint.Address;
Dr1Busy = true;
}
else
if (!Dr2Busy)
{
breakpoint.iReg = 2;
ct.Dr2 = breakpoint.Address;
Dr2Busy = true;
}
else
if (!Dr3Busy)
{
breakpoint.iReg = 3;
ct.Dr3 = breakpoint.Address;
Dr3Busy = true;
}
else
{
breakpoint.SUCC = false;
threadOpResult = ResumeThread(breakpoint.ThreadHandle);
GetLastError().ThrowOnError();
Win32Event.SetEvent(breakpoint.CompletionEvent);
return(0);
}
ct.Dr6 = IntPtr.Zero;
int st = 0;
if (breakpoint.Type == HardwareBreakpointType.Code)
{
st = 0;
}
if (breakpoint.Type == HardwareBreakpointType.ReadWrite)
{
st = 3;
}
if (breakpoint.Type == HardwareBreakpointType.Write)
{
st = 1;
}
int le = 0;
if (breakpoint.Size == HardwareBreakpointSize.Size1)
{
le = 0;
}
if (breakpoint.Size == HardwareBreakpointSize.Size2)
{
le = 1;
}
if (breakpoint.Size == HardwareBreakpointSize.Size4)
{
le = 3;
}
if (breakpoint.Size == HardwareBreakpointSize.Size8)
{
le = 2;
}
SetBits(ref ct.Dr7, 16 + breakpoint.iReg * 4, 2, st);
SetBits(ref ct.Dr7, 18 + breakpoint.iReg * 4, 2, le);
SetBits(ref ct.Dr7, breakpoint.iReg * 2, 1, 1);
}
ct.ContextFlags = ContextFlags.DebugRegisters;
ct.Set(breakpoint.ThreadHandle);
ct = new Win32ThreadContext {
ContextFlags = ContextFlags.DebugRegisters
};
Win32ThreadContext.Get(breakpoint.ThreadHandle, ref ct);
threadOpResult = ResumeThread(breakpoint.ThreadHandle);
GetLastError().ThrowOnError();
breakpoint.SUCC = true;
Win32Event.SetEvent(breakpoint.CompletionEvent);
return(0);
}
