Remove SYS_CHMOD and cwd related syscalls/files.

src/syscall/mod.rs

@@ -93,7 +93,6 @@ pub fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize, stack
             },
             SYS_CLASS_PATH => match a {
                 SYS_OPEN => open(validate_str(b as *const u8, c)?, d).map(FileHandle::into),
-                SYS_CHMOD => chmod(validate_str(b as *const u8, c)?, d as u16),
                 SYS_RMDIR => rmdir(validate_str(b as *const u8, c)?),
                 SYS_UNLINK => unlink(validate_str(b as *const u8, c)?),
                 _ => Err(Error::new(ENOSYS))
@@ -117,9 +116,7 @@ pub fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize, stack
                 SYS_EXIT => exit((b & 0xFF) << 8),
                 SYS_KILL => kill(ContextId::from(b), c),
                 SYS_WAITPID => waitpid(ContextId::from(b), c, WaitFlags::from_bits_truncate(d)).map(ContextId::into),
-                SYS_CHDIR => chdir(validate_str(b as *const u8, c)?),
                 SYS_IOPL => iopl(b, stack),
-                SYS_GETCWD => getcwd(validate_slice_mut(b as *mut u8, c)?),
                 SYS_GETEGID => getegid(),
                 SYS_GETENS => getens(),
                 SYS_GETEUID => geteuid(),