Subroutine "arguments"??

subroutine sub(A)
real(8), intent(in) :: A(10,10)
...
end subroutine

call sub(B) ! where B is a matrix B(10,10)

A is a matrix. I known that the passing actual arguments to dummy
arguments is by passing the address of actual arguments. But I want to
ask that it is passing only the address of A(1,1) or all the address
of A(1,1),A(1,2).....A(10,10)?

And if A or B is a derived type argument, is it also pass by the
address? (There is a problem is that derived type argument has
discontinus memory, I'm not sure)

.

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