KiUmsFastReturnToUser

VOID __fastcall KiUmsFastReturnToUser(INT64 a1, INT64 a2, INT64 a3, INT64 a4){
  _ETHREAD *CurrentThread; 
  __int64 v5; 
  __int64 v6; 
  ULONG v7; 
  ULONG_PTR v8; 
  ULONG_PTR CurrentIrql; 
  _ETHREAD *v10; 
  _KTHREAD *v11; 
  __int64 v12; 
  unsigned __int8 v13; 
  unsigned __int8 v14; 
  void *v17; 
  CHAR v18; 
  CurrentThread = (_ETHREAD *)KeGetCurrentThread();
  v5 = *((_QWORD *)CurrentThread + 18) + 128i64;
  v6 = *((_DWORD *)CurrentThread + 121) | (unsigned int)(unsigned __int8)(*((_BYTE *)CurrentThread + 586) | KeGetCurrentIrql());
  if( (_DWORD)v6 )
  {
    v7 = 74;
    v8 = 0i64;
    CurrentIrql = KeGetCurrentIrql();
    if( !(_DWORD)CurrentIrql )
    {
      v7 = 1;
      CurrentIrql = *((unsigned __int8 *)CurrentThread + 586);
      v8 = *((unsigned int *)CurrentThread + 121);
    }
    KiBugCheckDispatch(v7, *(_QWORD *)(*((_QWORD *)CurrentThread + 18) + 360i64), CurrentIrql, v8);
  }
  _disable();
  while( (*((_BYTE *)KeGetCurrentThread() + 194) & 3) != 0 )
  {
    *(_QWORD *)(v5 - 80) = v6;
    *(_QWORD *)(v5 - 72) = 0i64;
    *(_QWORD *)(v5 - 64) = 0i64;
    *(_QWORD *)(v5 - 56) = 0i64;
    *(_QWORD *)(v5 - 48) = 0i64;
    *(_QWORD *)(v5 - 40) = 0i64;
    *(_QWORD *)(v5 - 32) = 0i64;
    *(_OWORD *)(v5 - 16) = 0i64;
    *(_OWORD *)v5 = 0i64;
    *(_OWORD *)(v5 + 16) = 0i64;
    *(_OWORD *)(v5 + 32) = 0i64;
    *(_OWORD *)(v5 + 48) = 0i64;
    *(_OWORD *)(v5 + 64) = 0i64;
    __writecr8(1ui64);
    _enable();
    KiInitiateUserApc((_KTRAP_FRAME *)1);
    _disable();
    __writecr8(0i64);
    v6 = *(_QWORD *)(v5 - 80);
  }
  if( (*((_BYTE *)KeGetPcr() + 638) & 2) != 0 )
  {
    *(_QWORD *)(v5 - 80) = v6;
    KiUpdateStibpPairing(0i64);
    v6 = *(_QWORD *)(v5 - 80);
  }
  v10 = (_ETHREAD *)KeGetCurrentThread();
  if( (*(_DWORD *)v10 & 0x8000000) != 0 )
  {
    *(_QWORD *)(v5 - 80) = v6;
    *(_QWORD *)(v5 - 72) = 0i64;
    *(_QWORD *)(v5 - 64) = 0i64;
    *(_QWORD *)(v5 - 56) = 0i64;
    *(_QWORD *)(v5 - 48) = 0i64;
    *(_QWORD *)(v5 - 40) = 0i64;
    *(_QWORD *)(v5 - 32) = 0i64;
    *(_OWORD *)(v5 - 16) = 0i64;
    *(_OWORD *)v5 = 0i64;
    *(_OWORD *)(v5 + 16) = 0i64;
    *(_OWORD *)(v5 + 32) = 0i64;
    *(_OWORD *)(v5 + 48) = 0i64;
    *(_OWORD *)(v5 + 64) = 0i64;
    KiRestoreSetContextState((INT64)v10, a2, a3, a4, v18);
  }
  v11 = (_ETHREAD *)KeGetCurrentThread();
  if( (*(_DWORD *)v11 & 0x40010000) != 0 )
  {
    *(_QWORD *)(v5 - 80) = v6;
    if( (*((_BYTE *)v11 + 2) & 1) != 0 )
    {
      KiCopyCounters((_KTHREAD *)v11);
      v11 = (_ETHREAD *)KeGetCurrentThread();
    }
    if( (*((_BYTE *)v11 + 3) & 0x40) != 0 )
      KiUmsExit(0);
    v6 = *(_QWORD *)(v5 - 80);
  }
  _mm_setcsr(*(_DWORD *)(v5 - 84));
  if( *(_WORD *)(v5 + 128) )
  {
    *(_QWORD *)(v5 - 80) = v6;
    KiRestoreDebugRegisterState();
    v12 = *(_QWORD *)(*((_QWORD *)KeGetCurrentThread() + 23) + 984i64);
    if( v12 && *(_WORD *)(v5 + 240) == 51 )
      *(_QWORD *)(v5 + 232) = v12;
    v6 = *(_QWORD *)(v5 - 80);
  }
  *(_QWORD *)(v5 - 80) = v6;
  __writegsbyte(0x853u, 0);
  v13 = *((_BYTE *)KeGetPcr() + 637);
  if( *((_BYTE *)KeGetPcr() + 634) != v13 )
  {
    __writegsbyte(0x27Au, v13);
    __writemsr(0x48u, v13);
  }
  v14 = _bittestandreset16(MK_FP(__GS__, 632i64), 2u);
  if( v14 )
    __writemsr(0x49u, 1ui64);
  v14 = _bittestandreset16(MK_FP(__GS__, 632i64), 5u);
  if( v14 )
    __flush_rsb();
  v17 = *(void **)(v5 + 232);
  if( (KiKvaShadow & 1) == 0 )
  {
    __swapgs();
    __sysretq(v17, *(_QWORD *)(v5 + 248));
  }
  KiKernelSysretExit(v17);
}

Referenced by: