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Command line tool to convert FAS file format from FASM (flat assembler) to any Symbol format.

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FasToSym

Command line tool to convert .fas symbols files from FASM (Flat assembler) to any type of Symbol format.

⚠️If you are here because you want to understand the symmbol file, FAS, from FASM, I think here you will find a good example of how to read the data and with this tool it should be possible to extend it to convert the FAS format file to anything.

1. Usage

Now with this tool it is possible to convert from .fas symbols file format.

.\FasToSym -i [filename].fas -t [outputType]

To for example the one accepted by No$gba like this:

eg: .\FasToSym -i mygame.fas -t nocashgba

This should generate in the same folder with the same name but with the extension .SYM.

2. Output files

When developping homebrew for the Nintendo Game Boy Advance using FASMARM, https://arm.flatassembler.net/, it is important to debug with symbols. So in order to generate them:

./fasmarm.exe main.asm gba_game.gba -s mygame.fas

The fas symbol file is not compatible with any of the GBA amulators so in order to convert it to for example No$Gba or Mesen (these two emulators have good debugging tool).

2.1 GBA symbols for No$Gba.

https://problemkaputt.de/gba.htm

To generate for this emulator use the the following command line:

.\FasToSym -i mygame.fas -t nocashgba

The documentation for its sym file format is here: https://problemkaputt.de/gbahlp.htm#symbolicdebuginfo

2.2 GBA symbols for Mesen2.

https://www.mesen.ca/

To generate for this emulator use the the following command line:

.\FasToSym -i mygame.fas -t mesen

The documentation for its sym file format is here: https://www.mesen.ca/docs/debugging/debuggerintegration.html#mesen-label-files-mlb

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Command line tool to convert FAS file format from FASM (flat assembler) to any Symbol format.

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