Part 1

Description

1. Macros are defined with STARTMACRO and ended with ENDMACRO.
2. The argument in macro definition is preceded by '%' symbol.
3. There is no such indentation rule in defining macros.
4. Comments in macros can be defined by using '//'. 
5. Macro can be called anywhere in the .asm program with parameters or without parameters and after expansion of whole definition get substituted.

General Syntax of Macro Definition

STARTMACRO macroname
  instruction1  
  //comment1
  instruction2
    STARTMACRO macroname1
    ..
    ..
    ENDMACRO
ENDMACRO  


Without Parameters

STARTMACRO Sum
  mov eax,1
  mov ebx,2
  add eax,ebx
  push eax
  call printf
ENDMACRO
Call:- Sum


Positional Parameters

STARTMACRO Sum %a,%b
  mov eax,a
  mov ebx,b
  add eax,ebx
  push eax
  call printf
ENDMACRO

Call:-  Sum 1,2


Keyword Parameters

STARTMACRO Sum %a,%b
  mov eax,[a]
  mov ebx,[b]
  add eax,ebx
  push eax
  call printf
ENDMACRO

Call:- Sum %b=1,%a=2