#Kernel System Call Assigment Brandon Mikulka brandon.mikulka@colorado.edu

A simple system call that adds 2 numbers together then returns the result to a variable in the userspace.

Kernel Files that were changed

Adds a system call that adds 2 numbers together and stores them in an int variable that resides in the userspace. Place the following kernel files in the appropriate paths listed below:

arch/x86/kernel/simple_add.c
arch/x86/kernel/Makefile
arch/x86/syscalls/syscall_64.tbl
includes/linux/syscalls.h

Quick test program for system call (319 in this case)

Takes the numbers 4 and 5 and sends them to the simple add syscall which should result in 9

syscall.c

(compile and run with gcc syscall.c -o syscall; ./syscall)

System Log file

/var/log/syslog

(this file can be tailed using tail -f /var/log/syslog)