linux2.6.32.2内核添加系统调用

内核版本2.6.32.2  

1 修改 arch/arm/include/asm/unistd.h

....

#define __NR_preadv (__NR_SYSCALL_BASE+361)

#define __NR_pwritev (__NR_SYSCALL_BASE+362)

#define __NR_rt_tgsigqueueinfo (__NR_SYSCALL_BASE+363)

#define __NR_perf_event_open (__NR_SYSCALL_BASE+364)

在后面添加自己写的调用

#define __NR_kernel_add (__NR_SYSCALL_BASE+365)

2 修改 arch/arm/kernel/sys_arm.c

在文件最后添加函数的实现

asmlinkage int sys_kernel_add(int a, int b)

{

return a+b;

}

3 修改 arck/arm/kernel/calls.S

....

/* 360 */ CALL(sys_inotify_init1)

CALL(sys_preadv)

CALL(sys_pwritev)

CALL(sys_rt_tgsigqueueinfo)

CALL(sys_perf_event_open)

CALL(sys_kernel_add)       /*添加这一行*/

4 编译内核，编译测试文件，下载测试程序到开发板运行

----test.c----

#define _GNU_SOURCE        /* or _BSD_SOURCE or _SVID_SOURCE */

#include

#include   /* For SYS_xxx definitions */

#include

#define __NR_kernel_add                 (__NR_SYSCALL_BASE+365)

int add(int a,int b)

{

    return syscall(__NR_kernel_add,a,b);

}

int main ()

{

  int c;

c=add(5,6);

printf("%d\n",c);

return 0;

}