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GDB server

The GDB server allows you to set breakpoints and control your PSX program's execution from your gdb compatible IDE.

Enabling the GDB server

Enable gdb server

In PCSX-Redux: Configuration > Emulation > Enable GDB server.

Make sure the debugger is also enabled.

enable debugger/gdb

GDB setup

You need gdb-multiarch on your system :

Windows

Download a pre-compiled version from here : https://static.grumpycoder.net/pixel/gdb-multiarch-windows/

GNU/Linux

Install via your package manager :

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# Debian derivative; Ubuntu, Mint...
sudo apt install gdb-multiarch
# Arch derivative; Manjaro
# 'gdb-multiarch' is available in aur : https://aur.archlinux.org/packages/gdb-multiarch/
sudo trizen -S gdb-multiarch

IDE setup

MS VScode

VScode native debg extension

  • Adapt your launch.json file to your environment :
    A sample lanuch.json file is available here.
    This should go in your-project/.vscode/.

You need to adapt the values of "executable", "gdbpath" and "autorun" according to your system :

executable

This is the path to your .elf executable :

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   "executable": "HelloWorld.elf",
https://github.com/grumpycoders/pcsx-redux/blob/a3bebd490388130e924124cdfeff3bc46b6149d9/.vscode/launch.json#L153

gdbpath

This the path to the gdb-multiarch executable:

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   "gdbpath": "/usr/bin/gdb-multiarch",
https://github.com/grumpycoders/pcsx-redux/blob/a3bebd490388130e924124cdfeff3bc46b6149d9/.vscode/launch.json#L154-L157

autorun

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   "autorun": [
    "monitor reset shellhalt",
    [...]
    "load your-file.elf",

Make sure that "load your-file.elf" corresponds to the "target" value.

https://github.com/grumpycoders/pcsx-redux/blob/a3bebd490388130e924124cdfeff3bc46b6149d9/.vscode/launch.json#L159-L165

By default, using localhost should work, but if encountering trouble, try using your computer's local IP (e.g; 192.168.x.x, 10.0.x.x, etc.)

https://github.com/grumpycoders/pcsx-redux/blob/a3bebd490388130e924124cdfeff3bc46b6149d9/.vscode/launch.json#L150

gdb debugging

Geany

Make sure you installed the official plugins and enable the Scope debugger.

To enable the plugin, open Geany, go to Tools > Plugin manager and enable Scope Debugger.

You can find the debugging facilities in the Debug menu ;

geany program setup

You can find the plugin's documentation here : https://plugins.geany.org/scope.html

.gdbinit

Create a .gdbinit file at the root of your project with the following content, adapting the path to your elf file and the gdb server's ip.

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target remote localhost:3333
symbol-file load /path/to/your/executable.elf
monitor reset shellhalt
load /path/to/your/executable.elf

Plugin configuration

In Geany : Debug > Setup Program :

geany program setup

Beginning Debugging

Launch pcsx-redux, then run the debugger from your IDE. It should load the elf file, and execute until the next breakpoint.

Starting debugging in Geany

Source :
https://archive.org/details/pcsx_redux_geany_gdb

Additional tools

https://github.com/cyrus-and/gdb-dashboard/