31     let path: &CStr = unsafe { CStr::from_ptr(regs.r8 as usize as *const c_char) };  in sys_open()
53     let fd = regs.r8 as i32;  in sys_close()
70     let fd = regs.r8 as i32;  in sys_read()
99     let fd = regs.r8 as i32;  in sys_write()
128     let fd = regs.r8 as i32;  in sys_lseek()
172     if regs.r8 == 0 {  in sys_chdir()
175     let ptr = regs.r8 as usize as *const c_char;  in sys_chdir()
228     let fd = regs.r8 as i32;  in sys_getdents()
267     let ptr = regs.r8 as usize as *const c_char;  in sys_mkdir()
306     let _dfd = regs.r8;  in sys_unlink_at()
378     let fd: i32 = regs.r8 as i32;  in sys_dup()
429     let ofd = regs.r8 as i32;  in sys_dup2()