How to export a symbol in FASM?

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AlectronikLabs

Joined: 11 Jan 2023
Posts: 1

AlectronikLabs 11 Jan 2023, 20:23

I am looking for a way to export and import symbols, for interfacing with C and both call FASM code from C as well as the other way round. Sorry if this has already been asked but I've been searching quite a bit both here on the board as well as with google and couldn't find anything FASM related.

In NASM the equivalent would be

Code:

global XY

.

Many thanks in advance! Wink

11 Jan 2023, 20:23

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8205
Location: Kraków, Poland

Tomasz Grysztar 11 Jan 2023, 21:01

There has been a recent thread about this: https://board.flatassembler.net/topic.php?t=22496

In short, you need to use object output (COFF or ELF), "public" directive to export symbols, and "extrn" directive to import symbols. The old FAQ also had a macro that emulated "global":

Code:

   macro global [symbol]
    {
     local isextrn,isglobal
     if defined symbol & ~ defined isextrn
       public symbol
     else if used symbol & defined isglobal
       extrn symbol
       isextrn = 1
     end if
     isglobal = 1
    }

11 Jan 2023, 21:01

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