How do i define macros in NASM x86

user_11592892 0
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I'm trying to implement couple of macros for x86 project. I just moved from MARS mips assembly so dont judge my incompetence. I think I'm doing everything as in this guide https://www.tutorialspoint.com/assembly_programming/assembly_macros.htm

  %macro assign a,b
       mov ax, [b]
       mov [a], ax
  %endmacro

This is the error i get:
fun.asm:21: error: `%macro' expects a parameter count

I've also tried doing this with "%" before values (a and b) but it only produced syntax errors

Could anybody point out what exactly am i doing wrong?

nasm x86 assembly macros
1 Answers

I don't think you can directly give names to the arguments like that. Instead you supply the number of arguments you expect and refer to the with %1, %2, etc. So your macro would look like this:

%macro assign 2
       mov ax, [%2]
       mov [%1], ax
%endmacro

There's more details in the NASM manual.

user_7866530
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