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I'm following the GDT guide but according to gdb is causing a "General Protection Fault" (0xd), according to the wiki this exception is thrown when a code segment is used improperly but as far as I understand if the GDT is not set segmentation is not enabled. What's going on? I cannot really understand
PS: I'm using GRUB2 as bootloader with Multiboot2 specification and I'm in protected mode

LolzDEV wrote:as far as I understand if the GDT is not set segmentation is not enabled.

Segmentation is always enabled.

LolzDEV wrote:What's going on?

The CPU is unable to use the segment descriptor corresponding to segment selector 8 as a code segment.

• Maybe the selector is wrong, and your code segment needs a different selector.
• Maybe you've made a mistake defining the descriptor and it's not a valid code segment.
• Maybe you've made a mistake loading the GDTR and the CPU isn't reading your GDT.

It's hard to say for sure without more information. For example, post a link to your git repository, or provide a register dump using QEMU's "-d int" option.