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(nasm.info)Section 4.9.2

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4.9.2. `%stacksize' Directive
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   The `%stacksize' directive is used in conjunction with the `%arg'
(see *Note Section 4.9.1::) and the `%local' (see *Note Section 4.9.3::)
directives. It tells NASM the default size to use for subsequent `%arg'
and `%local' directives. The `%stacksize' directive takes one required
argument which is one of `flat', `large' or `small'.

     %stacksize flat

   This form causes NASM to use stack-based parameter addressing
relative to `ebp' and it assumes that a near form of call was used to
get to this label (i.e. that `eip' is on the stack).

     %stacksize large

   This form uses `bp' to do stack-based parameter addressing and
assumes that a far form of call was used to get to this address (i.e.
that `ip' and `cs' are on the stack).

     %stacksize small

   This form also uses `bp' to address stack parameters, but it is
different from `large' because it also assumes that the old value of bp
is pushed onto the stack (i.e. it expects an `ENTER' instruction).  In
other words, it expects that `bp', `ip' and `cs' are on the top of the
stack, underneath any local space which may have been allocated by
`ENTER'. This form is probably most useful when used in combination
with the `%local' directive (see *Note Section 4.9.3::).