This is the scenario that I am working with. I have a 64 bit kernel mode driver project that I'm compiling and building in Visual Studio 2019 community with the target OS being windows 8.1 64 bit. This project contains an MyASM.asm file which in turn has a single assembly function defined (see below). The project compiles and builds successfully. So far so good. Now the problem that I'm having is when I try calling this single assembly function from main.cpp file the system crashes by freezing and locking up no BSOD. What can be causing this to happen ? Have I got the syntax correct for the .asm file am I missing anything ?
================================= MyASM.asm file ====================================
EXTERN DbgPrint:PROC
.data
dbgString byte "ATest() routine has been CALLED!\n", 0
.code
main PROC
main ENDP
ATest PROC PUBLIC
;MOV RDX, Offset dbgString
;PUSH [RDX]
;CALL DbgPrint
;POP RDX ;***check to see if DbgPrintEx cleans up the stack***
;RET
SUB RSP, 40h
MOV RCX, offset dbgString
CALL DbgPrint
ADD RSP, 40h
RET
ATest ENDP
END
============================== main.cpp file ==============================
extern "C" void ATest(void);
NTSTATUS
DriverEntry(
_In_ PDRIVER_OBJECT DriverObject,
_In_ PUNICODE_STRING RegistryPath)
{
// NTSTATUS variable to record success or failure
NTSTATUS status = STATUS_SUCCESS;
status = ByePgInitialize(SystemWideExceptionHandler, TRUE);
if (!NT_SUCCESS(status)) return status;
// Allocate the driver configuration object
WDF_DRIVER_CONFIG config;
// Print "Hello World" for DriverEntry
//KdPrintEx((DPFLTR_IHVDRIVER_ID, DPFLTR_INFO_LEVEL, "KmdfHelloWorld: DriverEntry\n"));
// Initialize the driver configuration object to register the entry point for the
// EvtDeviceAdd callback, KmdfHelloWorldEvtDeviceAdd
WDF_DRIVER_CONFIG_INIT(&config,
KmdfHelloWorldEvtDeviceAdd
);
// Finally, create the driver object
status = WdfDriverCreate(DriverObject,
RegistryPath,
WDF_NO_OBJECT_ATTRIBUTES,
&config,
WDF_NO_HANDLE
);
if (status != STATUS_SUCCESS)
return STATUS_UNSUCCESSFUL;
else
ATest();
}
