The macro engine of the GNU Assembler is quite similar to that of Microsoft's MASM, yet there are a few syntactic differences (not taking into account the overall syntax difference) that we have to pay attention to. Let us take the output_message procedure from the Linux test program in Chapter 2, Setting Up a Development
Environment, and replace the call to printf() with a simple macro for demonstration purposes.

.macro print message       ; .macro macro_name parameter
   pushl message          ; Put the parameter on stack
                           ; parameters are prefixed with ''
   call  printf            ; Call printf() library function
   add   $4, %esp          ; Restore stack after cdecl function call
.endm

output_message:
   pushl %ebp
   movl  %esp, %ebp
   print 8(%ebp)           ; This line would expand to the above macro
   movl  $0, %eax
   leave
   ret   $4