Function ProbeForReadSmallStructure

KernelLibrary/kDbgCore.h:658–703

#if defined(_AMD64_)

FORCEINLINE
VOID
ProbeForReadSmallStructure(
	IN PVOID Address,
	IN SIZE_T Size,
	IN ULONG Alignment
)

/*++
Routine Description:
	Probes a structure for read access whose size is known at compile time.
	N.B. A NULL structure address is not allowed.
Arguments:
	Address - Supples a pointer to the structure.
	Size - Supplies the size of the structure.
	Alignment - Supplies the alignment of structure.
Return Value:
	None
--*/

{

	ASSERT((Alignment == 1) || (Alignment == 2) ||
		(Alignment == 4) || (Alignment == 8) ||
		(Alignment == 16));

	if ((Size == 0) || (Size >= 0x10000)) {

		ASSERT(0);

		ProbeForRead(Address, Size, Alignment);

	}
	else {
		if (((ULONG_PTR)Address & (Alignment - 1)) != 0) {
			ExRaiseDatatypeMisalignment();
		}

		if ((PUCHAR)Address >= (UCHAR* const)MM_USER_PROBE_ADDRESS) {
			Address = (UCHAR* const)MM_USER_PROBE_ADDRESS;
		}

		_ReadWriteBarrier();
		*(volatile UCHAR*)Address;
	}
}

#else