28 pub extern "C" fn sys_open(regs: &pt_regs) -> u64 {  in sys_open()
29     let path: &CStr = unsafe { CStr::from_ptr(regs.r8 as usize as *const c_char) };  in sys_open()
35     let flags = regs.r9;  in sys_open()
50 pub extern "C" fn sys_close(regs: &pt_regs) -> u64 {  in sys_close()
51     let fd = regs.r8 as i32;  in sys_close()
67 pub extern "C" fn sys_read(regs: &pt_regs) -> u64 {  in sys_read()
68     let fd = regs.r8 as i32;  in sys_read()
69     let buf_vaddr = regs.r9 as usize;  in sys_read()
70     let len = regs.r10 as usize;  in sys_read()
73     if user_mode(regs) && unsafe { !verify_area(buf_vaddr as u64, len as u64) } {  in sys_read()
96 pub extern "C" fn sys_write(regs: &pt_regs) -> u64 {  in sys_write()
97     let fd = regs.r8 as i32;  in sys_write()
98     let buf_vaddr = regs.r9 as usize;  in sys_write()
99     let len = regs.r10 as usize;  in sys_write()
102     if user_mode(regs) && unsafe { !verify_area(buf_vaddr as u64, len as u64) } {  in sys_write()
125 pub extern "C" fn sys_lseek(regs: &pt_regs) -> u64 {  in sys_lseek()
126     let fd = regs.r8 as i32;  in sys_lseek()
127     let offset = regs.r9 as i64;  in sys_lseek()
128     let whence = regs.r10 as u32;  in sys_lseek()
169 pub extern "C" fn sys_chdir(regs: &pt_regs) -> u64 {  in sys_chdir()
170     if regs.r8 == 0 {  in sys_chdir()
173     let ptr = regs.r8 as usize as *const c_char;  in sys_chdir()
176         || (user_mode(regs) && unsafe { !verify_area(ptr as u64, PAGE_2M_SIZE as u64) })  in sys_chdir()
225 pub extern "C" fn sys_getdents(regs: &pt_regs) -> u64 {  in sys_getdents()
226     let fd = regs.r8 as i32;  in sys_getdents()
227     let count = regs.r10 as i64;  in sys_getdents()
228     let dirent = match unsafe { (regs.r9 as usize as *mut Dirent).as_mut() } {  in sys_getdents()
264 pub extern "C" fn sys_mkdir(regs: &pt_regs) -> u64 {  in sys_mkdir()
265     let ptr = regs.r8 as usize as *const c_char;  in sys_mkdir()
267         || (user_mode(regs) && unsafe { !verify_area(ptr as u64, PAGE_2M_SIZE as u64) })  in sys_mkdir()
273     let mode = regs.r9;  in sys_mkdir()
303 pub extern "C" fn sys_unlink_at(regs: &pt_regs) -> u64 {  in sys_unlink_at()
304     let _dfd = regs.r8;  in sys_unlink_at()
305     let ptr = regs.r9 as usize as *const c_char;  in sys_unlink_at()
307         || (user_mode(regs) && unsafe { !verify_area(ptr as u64, PAGE_2M_SIZE as u64) })  in sys_unlink_at()
313     let flag = regs.r10;  in sys_unlink_at()