How to externalize a proc in assembly x86?

I am wondering how I wo开发者_如何学运维uld go about externalizing a proc (example below) so I can use it when compiling two separate file together

FOOBAR PROC
    ;do something
    RET
FOOBAR ENDP

Thanks!

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extern foobar:proc

There's also a 'proto' directive to do an extern definition of a procedure that includes parameters so you can use 'invoke' to pass parameters to it.

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if you want to export it in stdcall format you need to call it in proper format:

_ProcedureName@0 (VOID procedure) _ProcedureName@16 (16 = 4x DWORD parameters)