EXPR

$EB EXPR - The first operand byte is the number of bytes to generate, and is <= NUMLEN. This is followed by a reverse polish notation expression. Operators include:

Operator	Description
$00	end of expression
$01	signed integer add
$02	signed integer subtract
$03	signed integer multiply
$04	signed integer divide
$05	modulo operation
$06	arithmetic negation
$07	signed bit shift operator
$08	logical and
$09	logical or
$0A	logical eor
$0B	logical not
$0C	logical <=
$0D	logical >=
$0E	logical <>
$0F	logical <
$10	logical >
$11	logical =
$12	bit and
$13	bit or
$14	bit eor
$15	bit not

Operands are

Operand	Description
$80	current location counter
$81	ABS - followed by a NUMLEN byte absolute value
$82	WEAK - followed by a LABLEN byte weak reference label name
$83	reference to a LABLEN byte label in the operand, resolves as the label value
$84	length attribute of the following LABLEN byte label
$85	type attribute of the following LABLEN byte label
$86	count attribute of the following LABLEN byte label
$87	REL - followed by a NUMLEN byte displacement from the start of the current module