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I'm very new to linux kernel development, but I have a few years of programming experience (not much C though).
I'm trying to get a syscall to work in user mode linux (version 126.96.36.199). I found a couple of tutorials on how to do it, but the file- and catalogue-structures doesn't really match, so I've tried to add code as best I could to make it work in my linux version.
The following additions have been made by me:
* In arch/x86/kernel/syscall_table_32.S
* In arch/x86/include/asm/unistd_32.h
#define __NR_mycall 333
* In arch/x86/include/asm/syscalls.h
asmlinkage long sys_mycall();
* In kernel\sys_ni.c
(don't know why I would need this line, but it doesn't compile without it)
* In arch/x86/kernel/Makefile
obj-y += mycall.o
* In arch/x86/kernel/mycall.c
asmlinkage long sys_mycall()
I then run the kernel in user mode and try to call my syscall:
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