添加系统调用

准备工作：

linux-2.6.33.tar.bz2

解压

 

cd linux-2.6.33

 

在kernel/sys.c中添加系统调用

 

 SYSCALL_DEFINE2(mul, int, x, int, y)
2 {
3     int c;
4     printk("hello user's syscall\n");
5     printk("invoke sys_mul\n");
6     c = x*y;
7     printk("%d * %d = %d\n", x, y, c);
8     return (long)c;
9 }

 

 

在arch/x86/kernel/syscall_table_32.S种添加

 

 .long sys_mul

 

 

 

 修改完毕，开始编译

$ zcat /prog/config.gz > .config
$ make xconfig
$ make
# make modules_install 
# cp -v arch/x86/boot/bzImage /boot/vmlinuz-2.6.33-ARCH
# mkinitcpio -k 2.6.33-ARCH -g /boot/kernel26-ARCH.img 

 

 make xconfig 可以直接保存

 make 需要很长的时间 

编译安装完毕

修改menu.lst

 

 

title  MyArch
root   (hd0,4)
kernel /boot/vmlinuz-2.6.33-ARCH root=/dev/sda5 ro
initrd /boot/kernel26-ARCH.img

 

 

 

 重启

 

--------------------- 我是分割线 ------------------

测试

 1 #include <unistd.h>
 2 #include <stdio.h>
 3 
 4 #define __NR_mul 338
 5 
 6 int main()
 7 {
 8     long c = 0;
 9     int x = 4;
10     int y = 9;
11     c = syscall(__NR_mul, x, y);
12     printf("%d * %d = %d\n", x, y, c);
13     return 0;
14 }
15 

 

 

运行结果

 

[chenwl@myhost ~]$ ./a.out 
4 * 9 = 36
[chenwl@myhost ~]$ dmesg | tail
fuse init (API version 7.13)
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
ADDRCONF(NETDEV_UP): wlan0: link is not ready
hello user's syscall
invoke sys_mul
4 * 9 = 36
hello user's syscall
invoke sys_mul
4 * 9 = 36

[chenwl@myhost ~]$ uname -r

2.6.33-ARCH