linux arch/arm64 添加系统调用

Posted 2020-10-24 yuchaodu

1，添加一个系统调用，增加系统总调用数+1

diff in kernel/include/uapi/asm-generic/unistd.h

++ #define __NR_mysyscall 285

++ SYSCALL(__NR_mysyscall, sys_mysyscall)

     #undef __NR_syscalls

-- #define __NR_syscalls 285

++ #define __NR_syscalls 286

2，声明

diff in kernel/include/linux/syscalls.h

++ asmlinkage long sys_mysyscall(const char __user * process)

     #endif

3，实现

diff in kernel/kernel/sys.c

++ SYSCALL_DEFINE1(mysyscall, const char __user *, process)

++ {

++ 　　struct task_struct * p=current;

++ 　　PRINT_LOG("add syscall %s %s\n",p->comm,process);

++ 　　return 1;

++ }

4，JNI层调用

#include <sys/syscall.h>

#define __NR_mysyscall 285

int ch=syscall(__NR_mysyscall,process);