RtlpHpFixedVsFree

VOID __fastcall RtlpHpFixedVsFree(INT64 a1, UINT64 a2, UINT64 a3, UINT64 a4){
  unsigned __int64 v4; 
  unsigned __int64 v6; 
  INT64 v7; 
  UINT64 v8; 
  int v9; 
  unsigned __int8 v10; 
  __m128i v11; 
  __int64 *v12; 
  __int64 v13; 
  unsigned __int64 v14; 
  bool i; 
  unsigned __int8 v16; 
  UINT8 v17; 
  int v18; 
  INT64 v19; 
  _ETHREAD *CurrentThread; 
  unsigned int SessionId; 
  char v22; 
  int v23; 
  __int64 v24; 
  unsigned __int64 v25; 
  __int64 v26; 
  INT64 v27[2]; 
  INT64 v28; 
  int v30; 
  v4 = (unsigned __int64)(unsigned int)a3 >> 12;
  v6 = (a2 - a1) >> 12;
  v7 = (unsigned int)a4;
  v28 = (unsigned int)a3;
  v8 = a2;
  v9 = a4 & 1;
  if( (a4 & 1) != 0 )
  {
    v10 = -1;
  }
  else
  {
    v17 = RtlpHpAcquireLockExclusive((INT64 *)(a1 + 24), *(unsigned int *)(a1 + 32));
    v8 = a2;
    v10 = v17;
  }
  v11 = *(__m128i *)(a1 + 48);
  v27[0] = *(_QWORD *)(a1 + 48);
  v27[1] = a1 ^ _mm_srli_si128(v11, 8).m128i_u64[0];
  if( v6 >= v27[0] )
    goto LABEL_20;
  if( v4 <= 1 )
  {
    if( v4 != 1 )
      goto LABEL_20;
    v16 = _bittest64((const signed __int64 *)v27[1], v6);
LABEL_19:
    if( !v16 )
      goto LABEL_20;
    goto LABEL_8;
  }
  if( v27[0] - v6 < v4 )
    goto LABEL_20;
  v12 = (__int64 *)(v27[1] + 8 * (v6 >> 6));
  v13 = *v12;
  v14 = v27[1] + 8 * ((v6 + v4 - 1) >> 6);
  if( v12 == (__int64 *)v14 )
  {
    if( ((0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)v4) << v6) & v13) == 0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)v4) << v6 )
      goto LABEL_8;
LABEL_20:
    RtlpLogHeapFailure(8i64, a1, v8, v28, v7, 0i64);
    __fastfail(0x32u);
  }
  for( i = ((-1i64 << v6) & v13) == -1i64 << v6; ; i = *v12 == -1 )
  {
    if( !i )
      goto LABEL_20;
    if( ++v12 == (__int64 *)v14 )
      break;
  }
  if( ((0xFFFFFFFFFFFFFFFFui64 >> ~((unsigned __int8)v6 + (unsigned __int8)v4 - 1)) & *v12) != 0xFFFFFFFFFFFFFFFFui64 >> ~((unsigned __int8)v6 + (unsigned __int8)v4 - 1) )
  {
    v16 = 0;
    goto LABEL_19;
  }
LABEL_8:
  RtlClearBitsEx((INT64)v27, v6, v4);
  if( !v9 )
  {
    v18 = *(_DWORD *)(a1 + 32);
    v19 = a1 + 24;
    if( v18 )
    {
      ExReleaseSpinLockExclusiveFromDpcLevel((INT64 *)v19);
      __writecr8(v10);
    }
    else
    {
      if( (_InterlockedExchangeAdd64((volatile signed __int64 *)v19, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
        ExfTryToWakePushLock((volatile INT64 *)v19);
      v30 = 0;
      CurrentThread = (_ETHREAD *)KeGetCurrentThread();
      if( (unsigned int)MiGetSystemRegionType(v19) == 1 )
        SessionId = MmGetSessionIdEx(*((_QWORD *)CurrentThread + 23));
      else
        SessionId = -1;
      --*((_WORD *)CurrentThread + 243);
      v22 = ++*((_BYTE *)CurrentThread + 794);
      v23 = (*((char *)CurrentThread + 792) | *((char *)CurrentThread + 870)) ^ 0x3F;
      while( 1 )
      {
        i = !_BitScanReverse((unsigned int *)&v24, v23);
        if( i )
          goto LABEL_29;
        v25 = *((_QWORD *)CurrentThread + 100) + 96 * v24;
        v23 &= ~(1 << v24);
        if( (*(_BYTE *)(v25 + 26) & 1) != 0
          && (*(_DWORD *)(v25 + 32) & 1) == 0
          && (*(_QWORD *)(v25 + 32) & 0x7FFFFFFFFFFFFFFCi64) == (v19 & 0x7FFFFFFFFFFFFFFCi64)
          && *(_DWORD *)(v25 + 40) == SessionId )
        {
          *(_BYTE *)(v25 + 26) &= ~1u;
          if( *(_QWORD *)(v25 + 32) )
            break;
        }
      }
      if( !v25 )
      {
LABEL_29:
        if( (*((_DWORD *)CurrentThread + 30) & 0x10000) == 0 )
          KeBugCheckEx(0x162u, (ULONG_PTR)CurrentThread, v19, SessionId, 0i64);
        goto LABEL_41;
      }
      *(_BYTE *)(v25 + 32) |= 2u;
      if( *(__int64 *)(v25 + 32) < 0 )
        KiAbEntryRemoveFromTree(v25);
      v30 = *(_DWORD *)(v25 + 88) & 0x1FFFF;
      *(_DWORD *)(v25 + 88) &= 0xFFFE0000;
      *(_BYTE *)(v25 + 25) &= ~1u;
      *(_QWORD *)(v25 + 32) = 0i64;
      v26 = (__int64)(v25 - *((_QWORD *)CurrentThread + 100)) / 96;
      if( v22 == 1 )
        *((_BYTE *)CurrentThread + 792) |= 1 << v26;
      else
        _InterlockedOr8((volatile signed __int8 *)CurrentThread + 870, 1 << v26);
LABEL_41:
      --*((_BYTE *)CurrentThread + 794);
      KiAbThreadRemoveBoosts((ULONG_PTR)CurrentThread, v19, (unsigned int *)&v30);
      i = (*((_WORD *)CurrentThread + 243))++ == 0xFFFF;
      if( i && *((_ETHREAD **)CurrentThread + 19) != (_ETHREAD *)((char *)CurrentThread + 152) )
        KiCheckForKernelApcDelivery();
      KiLeaveGuardedRegionUnsafe((__int64)KeGetCurrentThread());
    }
  }
}

Referenced by: