-asmlinkage long sys_execve(char *filename, char **argv, char **envp,
- struct pt_regs *regs);
-asmlinkage long sys_pipe(long arg0, long arg1, long arg2, long arg3,
- long arg4, long arg5, long arg6, long arg7, long stack);
+long sys_execve(char __user *filename, char __user * __user *argv,
+ char __user * __user *envp, struct pt_regs *regs);
+asmlinkage long sys_pipe(void);