Using ObjAsm to build 64bit code

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Using ObjAsm to build 64bit code

by gerph 1 month ago

macOS ◆ xterm-256color ◆ fish 79 views

RISC OS ObjAsm was a development of an early ARM assembler. Its syntax is still very similar to that of ARM’s armasm.

But it is very different from the more common GNU as syntax, and a whole lot more flexible. The ObjAsm syntax has more sane local variables, macros, mapping definitions, and constants, and string manipulation. It’s actually quite a nice assembler, compared to the GNU as syntax.

Here you can see my assembling AArch64 code for RISC OS using AArch64 syntax from my build environment.

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You can download this recording in asciicast v2 format, as a .cast file.

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Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 701940.cast

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Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/701940.cast',
      document.getElementById('player'),
      { cols: 123, rows: 27 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/701940 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.