KeAbPreAcquire

VOID *__stdcall KeAbPreAcquire(VOID *Lock, VOID *LockHandle, UINT64 Flags){
  _KLOCK_ENTRY *v3; 
  _ETHREAD *CurrentThread; 
  __int64 AbOrphanedEntrySummary; 
  char v7; 
  NTSTATUS SessionId; 
  bool v9; 
  int v11; 
  unsigned int v12; 
  UINT64 a3; 

  v3 = (_KLOCK_ENTRY *)LockHandle;
  LODWORD(a3) = 0;
  CurrentThread = (_ETHREAD *)KeGetCurrentThread();
  --CurrentThread->Tcb.SpecialApcDisable;
  if( ++CurrentThread->Tcb.AbAllocationRegionCount == 1 )
  {
    if( LockHandle )
    {
      *((_BYTE *)LockHandle + 32) |= 2u;
      if( *((__int64 *)LockHandle + 4) < 0 )
        KiAbEntryRemoveFromTree((_KLOCK_ENTRY *)LockHandle);
      v11 = v3->BoostBitmap.AllFields & 0x1FFFF;
      v12 = v3->BoostBitmap.AllFields & 0xFFFE0000;
      v3->ThreadLocalFlags &= ~1u;
      LODWORD(a3) = v11;
      v3->BoostBitmap.AllFields = v12;
      v3->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 = 0i64;
LABEL_6:
      if( (unsigned __int64)Lock >= 0xFFFF800000000000ui64
        && *((_BYTE *)&stru_140C4DB30 + (((unsigned __int64)Lock >> 39) & 0x1FF) + 6872) == 1 )
      {
        SessionId = MmGetSessionIdEx(CurrentThread->Tcb.ApcState.Process);
      }
      else
      {
        SessionId = -1;
      }
      v3->LockState.SessionId = SessionId;
      v3->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 = (unsigned __int64)Lock & 0x7FFFFFFFFFFFFFFCi64;
      goto LABEL_10;
    }
    LOBYTE(AbOrphanedEntrySummary) = CurrentThread->Tcb.AbEntrySummary;
    if( !(_BYTE)AbOrphanedEntrySummary )
    {
      if( !CurrentThread->Tcb.AbOrphanedEntrySummary )
      {
        v3 = 0i64;
LABEL_5:
        if( !v3 )
        {
          _interlockedbittestandset((volatile signed __int32 *)&CurrentThread->Tcb.116 + 1, 0x10u);
          goto LABEL_10;
        }
        goto LABEL_6;
      }
      AbOrphanedEntrySummary = CurrentThread->Tcb.AbOrphanedEntrySummary;
      CurrentThread->Tcb.AbOrphanedEntrySummary = 0;
      LOBYTE(AbOrphanedEntrySummary) = CurrentThread->Tcb.AbEntrySummary | AbOrphanedEntrySummary;
    }
    v7 = AbOrphanedEntrySummary;
    _BitScanForward((unsigned int *)&AbOrphanedEntrySummary, (unsigned __int8)AbOrphanedEntrySummary);
    CurrentThread->Tcb.AbEntrySummary = v7 & ~(1 << AbOrphanedEntrySummary);
    v3 = &CurrentThread->Tcb.LockEntries[AbOrphanedEntrySummary];
    goto LABEL_5;
  }
  if( (Flags & 1) == 0 )
    KeBugCheckEx(0x192u, CurrentThread, Lock, (PVOID)KeGetCurrentIrql(), 0i64);
  _interlockedbittestandset((volatile signed __int32 *)&CurrentThread->Tcb.116 + 1, 0x10u);
  v3 = 0i64;
LABEL_10:
  --CurrentThread->Tcb.AbAllocationRegionCount;
  KiAbThreadRemoveBoosts(&CurrentThread->Tcb, Lock, &a3);
  v9 = CurrentThread->Tcb.SpecialApcDisable++ == -1;
  if( v9
    && ($F25F8C4BA33AF922A5F1AF68CD89DDDF *)CurrentThread->Tcb.ApcState.ApcListHead[0].Flink != &CurrentThread->Tcb.152 )
  {
    KiCheckForKernelApcDelivery();
  }
  return v3;
}

Referenced by: