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Add a system call on Ubuntu 13.04(x64) with x86_64
We added a system call to modify idt table, then programed it in modify_idt.c
1. Put our modify_idt.c file in /usr/src/linux-3.10.15/arch/x86/kernel
2. /usr/src/linux-3.10.15/arch/x86/syscalls# vim syscall_64.tbl
add a new line
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| 1 | 314 64 modify_idt sys_modify_idt |
3. Add the prototype of our system call in
/usr/src/linux-3.10.15/include/linux/syscalls.h
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| 1 | asmlinkage long sys_modify_idt(int i); |
4. Add the file to the Makefile in /usr/src/linux-3.10.15/arch/x86/kernel/Makefile by
adding modify_idt.o to the list in obj-y += ...
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| 1 2 3 4 | obj-y := process_$(BITS).o signal.o entry_$(BITS).oobj-y += traps.o irq.o irq_$(BITS).o dumpstack_$(BITS).oobj-y += modify_idt.o // adding this one |
5. Do not forget to recompile & reload the kernel before testing!
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