15 Using GDB with Linux AppImages

Using GDB with Linux AppImages (32 bit and 64 bit)

This guide is useful if for example you'd like to debug a 32 bit crash but cannot build a 32 bit PCSX2.

1. Put your AppImage into a directory by itself

   We'll call the AppImage PCSX2.AppImage and I'll assume you have a terminal in this directory.

2. Extract the contents of the AppImage

   You can do this by doing ./PCSX2.AppImage --appimage-extract

   A new directory called squashfs-root should have been created.

3. Run the AppImage normally

   ./PCSX2.AppImage

4. Get the PID of the current PCSX2 instance

   You can do pidof PCSX2.

   If there is more than one pid that shows up, you have more than one PCSX2 running!

   We'll call your running pid <PID>

5. Attach GDB (during a fault or when PCSX2 is running normally, doesn't matter)

   Note: In my case I have to run gdb as sudo

   gdb squashfs-root/usr/bin/PCSX2 -p <PID>

   set sysroot ./squashfs-root

   set solib-search-path ./squashfs-root/usr/lib

   The last two commands are due to the fact that the AppImage runs in a sanboxed area. It points gdb to where PCSX2 is going to look for libraries for example.

The commands in-order are listed below:

./PCSX2.AppImage --appimage-extract

./PCSX2.AppImage

pidof PCSX2

gdb squashfs-root/usr/bin/PCSX2 -p <PID>

set sysroot ./squashfs-root

set solib-search-path ./squashfs-root/usr/lib

-- You now have GDB set up and connected to your PCSX2