[NTOS:EX] Implement NtSystemDebugControl: SysDbgBreakPoint

Author: hpoussin

ntoskrnl/ex/dbgctrl.c

@@ -271,6 +271,17 @@ NtSystemDebugControl(
                 break;
 
             case SysDbgBreakPoint:
+                if (KdDebuggerEnabled)
+                {
+                    DbgBreakPointWithStatus(DBG_STATUS_DEBUG_CONTROL);
+                    Status = STATUS_SUCCESS;
+                }
+                else
+                {
+                    Status = STATUS_UNSUCCESSFUL;
+                }
+                break;
+
             case SysDbgEnableKernelDebugger:
             case SysDbgDisableKernelDebugger:
             case SysDbgGetAutoKdEnable: