94.574 Elements of Computer Systems

SCE 574

Anatomy of an Assembler Language (cont.)

F) Memory declarations

äReserve and possibly initialize memory

G) Comments

äFor human consumption, ignored by the assembler

H) Macros

äDefine a sequence of code (like a procedure) with a name

PUSHALL MACRO

PUSH AX BX CX DX

PUSH DS SI

PUSH ES DI

ENDM

äTo invoke, use name instead of the code sequence

PUSHALL

äto generate

PUSH AX BX CX DX

PUSH DS SI

PUSH ES DI

In this example

PUSH is a regular

assembly instruction

and AX... are register

names