Mathieu Maret
6854ad489f
Trick was to use the stack-protector-guard option otherwise gcc expect the canary value to be stored on the Thread Local Storage of the current thread. That does not work the same way for us, so trying to access TLS at %gs (the canonical place for the TLS), where gcc expect the canary to be storeg, lead to system reboot as it is not setup.
Introduction
Matos is a simple OS.
It's targetting x86 and inspirated by http://sos.enix.org/fr/PagePrincipale
Dependencies
To generate iso image
mtools xorriso (which is libisoburn on ArchLinux)- gcc for 32bits (e.g. gcc-multilib for ubuntu) >= 11
- sfdisk (util-linux)
Run it
make run
or
make fd.iso && qemu-system-x86_64 -cdrom fd.iso
you can also test it
make test
Debug
gdb could be launch with debug symbols using :
make debug
Serial log will be saved in the serialOut file.
Then you can check some matos specific commands or pretty printing with
help user-defined
info pretty-printer (Should contains matos_pretty_printers)
Change Disk partitions
You can either modify the disk.sfdisk file
or
modify the disk image with your favorit tool (e.g. gparted) and re-generate disk.sfdisk
sfdisk -d > disk.sfdisk
Multiboot
In arch/x86/boot, you can choose the assembly used to start the C part by removing the .opt extension
- boot.asm: intel syntax with multiboot support
- boot.S: GNU As syntax with multiboot support
- boot_multiboot2.S: GNU As syntax with multiboot2 support
/!\ multiboot2 is not supported by qemu for -kernel option (https://gitlab.com/qemu-project/qemu/-/issues/389).
So you may have to use the fd.iso image and modify the grub configuration from multiboot /boot/kernel to multiboot2 /boot/kernel
Features
- VGA Driver
- keyboard Driver
- Serial Driver
- Timer
- Virtual memory
- Allocator
- Multithread (Full preempt)
- Mutex
- ATA
- basic userspace with syscall
TODO
- ringbuffer protected by mutex
- blocking read