Stored Procedure Default Value Question

Is there a way inside a stored procedure to determine if a parameter defined with a default value was explicity passed the same value as the default vs. the parameter was omitted and you just got the default value.

E.g. create procedure mysp_stuff @parm1 varchar(20)=NULL, @parm1 bit=0 as
if (@parm1 is null)
begin
-- did we get the default or did the caller pass NULL
end
if (@parm2 = 0
begin
-- did we get the default or did the caller pass 0
end
GO

EXEC mysp_stuff
go
EXEC mysp_stuff @parm1=NULL, @parm2=0
go