x86-64 Playground – An online assembly editor and GDB-like debugger

Re:x86-64 Playground – An online assembly editor and GDB-lik... by 201984 on Monday October 20, 2025 @11:36PM (#45652207)

Pretty neat idea, but it evaluates the lzcnt instruction incorrectly, so it's possible others are wrong too. If you have access to a real x86_64 processor, you're probably better off just using it, and then you get the power of a full debugger with breakpoints in gdb.

Also, the "Guides" button and the "embed on your website" link on the main page are broken.

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Re:x86-64 Playground – An online assembly editor and GDB-lik... by halb on Tuesday October 21, 2025 @04:34AM (#45653720)

This is mostly an educational tool, and it's intentionally designed to present data in a similar way to GDB. The idea is that students will use this tool to learn basic assembly concepts without the extra friction of GDB, and when they are ready they will move to the real tools, where hopefully they will already recognize some of the elements.

I am intentionally not implementing any useful feature beyond single stepping so that students will not remain stuck on a local minimum using this website.

[ Parent | on HN ]