Kernel Development Learning Pipeline

L4 - 1 February 2023

Lecture Recording

Class Notes:

• Reminder to do proper code review
• Explaining A3
• Explaining executables ~00:18:00
• Reference to LSB in file command: https://unix.stackexchange.com/questions/393384/what-does-lsb-mean-when-referring-to-executable-files-in-the-output-of-bin-fi
• Showing xxd and objdump ~00:23:00
• Showing assembly of executable
• Showing ldd ~00:25:00
• Showing how to write assembly of a simple C program ~00:29:00
• Exit syscall ~00:40:00
• Syscall table: https://marcin.juszkiewicz.com.pl/download/tables/syscalls.html
• Adding functionality to assembly program ~00:51:00
• Due date for A3 will be moved to a later date
• Adding write syscall to assembly ~01:04:00
• Linux syscall calling conventions: https://refspecs.linuxbase.org/elf/x86_64-SysV-psABI.pdf
• Reference to kernel code: https://elixir.bootlin.com/linux/latest/source
• Descriptions of syscall instruction: https://www.felixcloutier.com/x86/syscall
• Syscall table in the x86_64 kernel: https://elixir.bootlin.com/linux/latest/source/arch/x86/entry/syscalls/syscall_64.tbl