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gdb is the best

The UI is pretty terrible though in my opinion. Registers should always be visible so that you can watch them change without having to type it after every command.

Launch GDB with the -tui flag.

https://sourceware.org/gdb/onlinedocs/gdb/TUI.html

Or C-x a after launching GDB. Followed up by "layout regs" and "layout split" and you have a pretty decent debugger.

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