Wow64CurrentNativeTeb - NtDoc

#ifndef _NTWOW64_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#ifdef _M_X64

FORCEINLINE
VOID*
POINTER_UNSIGNED
Wow64CurrentNativeTeb(
    VOID
    )
{
    TEB* POINTER_UNSIGNED Teb;
    VOID* POINTER_UNSIGNED HostTeb;

    Teb = NtCurrentTeb();

    if (Teb->WowTebOffset >= 0)
    {
        //
        // Not running under WoW, so it it either not running on WoW at all, or
        // it is the host. Return the current teb as native teb.
        //

        HostTeb = (PVOID)Teb;
    }
    else
    {
        //
        // Called while running under WoW Host, so calculate the position of the
        // host teb relative to the current (guest) teb.
        //

        HostTeb = (PVOID)RtlOffsetToPointer(Teb, Teb->WowTebOffset);
    }

    RTL_ASSERT((((PTEB32)HostTeb)->NtTib.Self == PtrToUlong(HostTeb)) || ((ULONG_PTR)((PTEB)HostTeb)->NtTib.Self == (ULONG_PTR)HostTeb));

    return HostTeb;
}

#endif
#endif
#endif
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