std: begin moving platform support modules into `pal`

11 files changed, 0 insertions, 1159 deletions

diff --git a/library/std/src/sys/teeos/alloc.rs b/library/std/src/sys/teeos/alloc.rs
deleted file mode 100644
index e236819aa23..00000000000
--- a/library/std/src/sys/teeos/alloc.rs
+++ /dev/null
@@ -1,57 +0,0 @@
-use crate::alloc::{GlobalAlloc, Layout, System};
-use crate::ptr;
-use crate::sys::common::alloc::{realloc_fallback, MIN_ALIGN};
-
-#[stable(feature = "alloc_system_type", since = "1.28.0")]
-unsafe impl GlobalAlloc for System {
-    #[inline]
-    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        // jemalloc provides alignment less than MIN_ALIGN for small allocations.
-        // So only rely on MIN_ALIGN if size >= align.
-        // Also see <https://github.com/rust-lang/rust/issues/45955> and
-        // <https://github.com/rust-lang/rust/issues/62251#issuecomment-507580914>.
-        if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::malloc(layout.size()) as *mut u8
-        } else {
-            aligned_malloc(&layout)
-        }
-    }
-
-    #[inline]
-    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
-        // See the comment above in `alloc` for why this check looks the way it does.
-        if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::calloc(layout.size(), 1) as *mut u8
-        } else {
-            let ptr = self.alloc(layout);
-            if !ptr.is_null() {
-                ptr::write_bytes(ptr, 0, layout.size());
-            }
-            ptr
-        }
-    }
-
-    #[inline]
-    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
-        libc::free(ptr as *mut libc::c_void)
-    }
-
-    #[inline]
-    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
-        if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
-            libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
-        } else {
-            realloc_fallback(self, ptr, layout, new_size)
-        }
-    }
-}
-
-#[inline]
-unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-    let mut out = ptr::null_mut();
-    // posix_memalign requires that the alignment be a multiple of `sizeof(void*)`.
-    // Since these are all powers of 2, we can just use max.
-    let align = layout.align().max(crate::mem::size_of::<usize>());
-    let ret = libc::posix_memalign(&mut out, align, layout.size());
-    if ret != 0 { ptr::null_mut() } else { out as *mut u8 }
-}
diff --git a/library/std/src/sys/teeos/locks/condvar.rs b/library/std/src/sys/teeos/locks/condvar.rs
deleted file mode 100644
index c08e8145b8c..00000000000
--- a/library/std/src/sys/teeos/locks/condvar.rs
+++ /dev/null
@@ -1,100 +0,0 @@
-use crate::cell::UnsafeCell;
-use crate::ptr;
-use crate::sync::atomic::{AtomicPtr, Ordering::Relaxed};
-use crate::sys::locks::mutex::{self, Mutex};
-use crate::sys::time::TIMESPEC_MAX;
-use crate::sys_common::lazy_box::{LazyBox, LazyInit};
-use crate::time::Duration;
-
-extern "C" {
-    pub fn pthread_cond_timedwait(
-        cond: *mut libc::pthread_cond_t,
-        lock: *mut libc::pthread_mutex_t,
-        adstime: *const libc::timespec,
-    ) -> libc::c_int;
-}
-
-struct AllocatedCondvar(UnsafeCell<libc::pthread_cond_t>);
-
-pub struct Condvar {
-    inner: LazyBox<AllocatedCondvar>,
-    mutex: AtomicPtr<libc::pthread_mutex_t>,
-}
-
-#[inline]
-fn raw(c: &Condvar) -> *mut libc::pthread_cond_t {
-    c.inner.0.get()
-}
-
-unsafe impl Send for AllocatedCondvar {}
-unsafe impl Sync for AllocatedCondvar {}
-
-impl LazyInit for AllocatedCondvar {
-    fn init() -> Box<Self> {
-        let condvar = Box::new(AllocatedCondvar(UnsafeCell::new(libc::PTHREAD_COND_INITIALIZER)));
-
-        let r = unsafe { libc::pthread_cond_init(condvar.0.get(), crate::ptr::null()) };
-        assert_eq!(r, 0);
-
-        condvar
-    }
-}
-
-impl Drop for AllocatedCondvar {
-    #[inline]
-    fn drop(&mut self) {
-        let r = unsafe { libc::pthread_cond_destroy(self.0.get()) };
-        debug_assert_eq!(r, 0);
-    }
-}
-
-impl Condvar {
-    pub const fn new() -> Condvar {
-        Condvar { inner: LazyBox::new(), mutex: AtomicPtr::new(ptr::null_mut()) }
-    }
-
-    #[inline]
-    fn verify(&self, mutex: *mut libc::pthread_mutex_t) {
-        match self.mutex.compare_exchange(ptr::null_mut(), mutex, Relaxed, Relaxed) {
-            Ok(_) => {}                // Stored the address
-            Err(n) if n == mutex => {} // Lost a race to store the same address
-            _ => panic!("attempted to use a condition variable with two mutexes"),
-        }
-    }
-
-    #[inline]
-    pub fn notify_one(&self) {
-        let r = unsafe { libc::pthread_cond_signal(raw(self)) };
-        debug_assert_eq!(r, 0);
-    }
-
-    #[inline]
-    pub fn notify_all(&self) {
-        let r = unsafe { libc::pthread_cond_broadcast(raw(self)) };
-        debug_assert_eq!(r, 0);
-    }
-
-    #[inline]
-    pub unsafe fn wait(&self, mutex: &Mutex) {
-        let mutex = mutex::raw(mutex);
-        self.verify(mutex);
-        let r = libc::pthread_cond_wait(raw(self), mutex);
-        debug_assert_eq!(r, 0);
-    }
-
-    pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
-        use crate::sys::time::Timespec;
-
-        let mutex = mutex::raw(mutex);
-        self.verify(mutex);
-
-        let timeout = Timespec::now(libc::CLOCK_MONOTONIC)
-            .checked_add_duration(&dur)
-            .and_then(|t| t.to_timespec())
-            .unwrap_or(TIMESPEC_MAX);
-
-        let r = pthread_cond_timedwait(raw(self), mutex, &timeout);
-        assert!(r == libc::ETIMEDOUT || r == 0);
-        r == 0
-    }
-}
diff --git a/library/std/src/sys/teeos/locks/mod.rs b/library/std/src/sys/teeos/locks/mod.rs
deleted file mode 100644
index c58e9c7fd45..00000000000
--- a/library/std/src/sys/teeos/locks/mod.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-pub mod condvar;
-#[path = "../../unix/locks/pthread_mutex.rs"]
-pub mod mutex;
-pub mod rwlock;
-
-pub(crate) use condvar::Condvar;
-pub(crate) use mutex::Mutex;
-pub(crate) use rwlock::RwLock;
diff --git a/library/std/src/sys/teeos/locks/rwlock.rs b/library/std/src/sys/teeos/locks/rwlock.rs
deleted file mode 100644
index 27cdb88788f..00000000000
--- a/library/std/src/sys/teeos/locks/rwlock.rs
+++ /dev/null
@@ -1,44 +0,0 @@
-use crate::sys::locks::mutex::Mutex;
-
-/// we do not supported rwlock, so use mutex to simulate rwlock.
-/// it's useful because so many code in std will use rwlock.
-pub struct RwLock {
-    inner: Mutex,
-}
-
-impl RwLock {
-    #[inline]
-    pub const fn new() -> RwLock {
-        RwLock { inner: Mutex::new() }
-    }
-
-    #[inline]
-    pub fn read(&self) {
-        unsafe { self.inner.lock() };
-    }
-
-    #[inline]
-    pub fn try_read(&self) -> bool {
-        unsafe { self.inner.try_lock() }
-    }
-
-    #[inline]
-    pub fn write(&self) {
-        unsafe { self.inner.lock() };
-    }
-
-    #[inline]
-    pub unsafe fn try_write(&self) -> bool {
-        unsafe { self.inner.try_lock() }
-    }
-
-    #[inline]
-    pub unsafe fn read_unlock(&self) {
-        unsafe { self.inner.unlock() };
-    }
-
-    #[inline]
-    pub unsafe fn write_unlock(&self) {
-        unsafe { self.inner.unlock() };
-    }
-}
diff --git a/library/std/src/sys/teeos/mod.rs b/library/std/src/sys/teeos/mod.rs
deleted file mode 100644
index ed8c54b2c36..00000000000
--- a/library/std/src/sys/teeos/mod.rs
+++ /dev/null
@@ -1,167 +0,0 @@
-//! System bindings for the Teeos platform
-//!
-//! This module contains the facade (aka platform-specific) implementations of
-//! OS level functionality for Teeos.
-#![allow(unsafe_op_in_unsafe_fn)]
-#![allow(unused_variables)]
-#![allow(dead_code)]
-
-pub use self::rand::hashmap_random_keys;
-
-pub mod alloc;
-#[path = "../unsupported/args.rs"]
-pub mod args;
-#[path = "../unix/cmath.rs"]
-pub mod cmath;
-#[path = "../unsupported/env.rs"]
-pub mod env;
-pub mod locks;
-//pub mod fd;
-#[path = "../unsupported/fs.rs"]
-pub mod fs;
-#[path = "../unsupported/io.rs"]
-pub mod io;
-#[path = "../unix/memchr.rs"]
-pub mod memchr;
-pub mod net;
-#[path = "../unsupported/once.rs"]
-pub mod once;
-pub mod os;
-#[path = "../unix/os_str.rs"]
-pub mod os_str;
-#[path = "../unix/path.rs"]
-pub mod path;
-#[path = "../unsupported/pipe.rs"]
-pub mod pipe;
-#[path = "../unsupported/process.rs"]
-pub mod process;
-mod rand;
-pub mod stdio;
-pub mod thread;
-pub mod thread_local_dtor;
-#[path = "../unix/thread_local_key.rs"]
-pub mod thread_local_key;
-#[path = "../unsupported/thread_parking.rs"]
-pub mod thread_parking;
-#[allow(non_upper_case_globals)]
-#[path = "../unix/time.rs"]
-pub mod time;
-
-use crate::io::ErrorKind;
-
-pub fn abort_internal() -> ! {
-    unsafe { libc::abort() }
-}
-
-// Trusted Applications are loaded as dynamic libraries on Teeos,
-// so this should never be called.
-pub fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {}
-
-// SAFETY: must be called only once during runtime cleanup.
-// this is not guaranteed to run, for example when the program aborts.
-pub unsafe fn cleanup() {
-    unimplemented!()
-    // We do NOT have stack overflow handler, because TEE OS will kill TA when it happens.
-    // So cleanup is commented
-    // stack_overflow::cleanup();
-}
-
-#[inline]
-pub(crate) fn is_interrupted(errno: i32) -> bool {
-    errno == libc::EINTR
-}
-
-// Note: code below is 1:1 copied from unix/mod.rs
-pub fn decode_error_kind(errno: i32) -> ErrorKind {
-    use ErrorKind::*;
-    match errno as libc::c_int {
-        libc::E2BIG => ArgumentListTooLong,
-        libc::EADDRINUSE => AddrInUse,
-        libc::EADDRNOTAVAIL => AddrNotAvailable,
-        libc::EBUSY => ResourceBusy,
-        libc::ECONNABORTED => ConnectionAborted,
-        libc::ECONNREFUSED => ConnectionRefused,
-        libc::ECONNRESET => ConnectionReset,
-        libc::EDEADLK => Deadlock,
-        libc::EDQUOT => FilesystemQuotaExceeded,
-        libc::EEXIST => AlreadyExists,
-        libc::EFBIG => FileTooLarge,
-        libc::EHOSTUNREACH => HostUnreachable,
-        libc::EINTR => Interrupted,
-        libc::EINVAL => InvalidInput,
-        libc::EISDIR => IsADirectory,
-        libc::ELOOP => FilesystemLoop,
-        libc::ENOENT => NotFound,
-        libc::ENOMEM => OutOfMemory,
-        libc::ENOSPC => StorageFull,
-        libc::ENOSYS => Unsupported,
-        libc::EMLINK => TooManyLinks,
-        libc::ENAMETOOLONG => InvalidFilename,
-        libc::ENETDOWN => NetworkDown,
-        libc::ENETUNREACH => NetworkUnreachable,
-        libc::ENOTCONN => NotConnected,
-        libc::ENOTDIR => NotADirectory,
-        libc::ENOTEMPTY => DirectoryNotEmpty,
-        libc::EPIPE => BrokenPipe,
-        libc::EROFS => ReadOnlyFilesystem,
-        libc::ESPIPE => NotSeekable,
-        libc::ESTALE => StaleNetworkFileHandle,
-        libc::ETIMEDOUT => TimedOut,
-        libc::ETXTBSY => ExecutableFileBusy,
-        libc::EXDEV => CrossesDevices,
-
-        libc::EACCES | libc::EPERM => PermissionDenied,
-
-        // These two constants can have the same value on some systems,
-        // but different values on others, so we can't use a match
-        // clause
-        x if x == libc::EAGAIN || x == libc::EWOULDBLOCK => WouldBlock,
-
-        _ => Uncategorized,
-    }
-}
-
-#[doc(hidden)]
-pub trait IsMinusOne {
-    fn is_minus_one(&self) -> bool;
-}
-
-macro_rules! impl_is_minus_one {
-    ($($t:ident)*) => ($(impl IsMinusOne for $t {
-        fn is_minus_one(&self) -> bool {
-            *self == -1
-        }
-    })*)
-}
-
-impl_is_minus_one! { i8 i16 i32 i64 isize }
-
-pub fn cvt<T: IsMinusOne>(t: T) -> crate::io::Result<T> {
-    if t.is_minus_one() { Err(crate::io::Error::last_os_error()) } else { Ok(t) }
-}
-
-pub fn cvt_r<T, F>(mut f: F) -> crate::io::Result<T>
-where
-    T: IsMinusOne,
-    F: FnMut() -> T,
-{
-    loop {
-        match cvt(f()) {
-            Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
-            other => return other,
-        }
-    }
-}
-
-pub fn cvt_nz(error: libc::c_int) -> crate::io::Result<()> {
-    if error == 0 { Ok(()) } else { Err(crate::io::Error::from_raw_os_error(error)) }
-}
-
-use crate::io as std_io;
-pub fn unsupported<T>() -> std_io::Result<T> {
-    Err(unsupported_err())
-}
-
-pub fn unsupported_err() -> std_io::Error {
-    std_io::Error::new(std_io::ErrorKind::Unsupported, "operation not supported on this platform")
-}
diff --git a/library/std/src/sys/teeos/net.rs b/library/std/src/sys/teeos/net.rs
deleted file mode 100644
index 0df681dbfa5..00000000000
--- a/library/std/src/sys/teeos/net.rs
+++ /dev/null
@@ -1,372 +0,0 @@
-use crate::fmt;
-use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut};
-use crate::net::{Ipv4Addr, Ipv6Addr, Shutdown, SocketAddr};
-use crate::sys::unsupported;
-use crate::time::Duration;
-
-pub struct TcpStream(!);
-
-impl TcpStream {
-    pub fn connect(_: io::Result<&SocketAddr>) -> io::Result<TcpStream> {
-        unsupported()
-    }
-
-    pub fn connect_timeout(_: &SocketAddr, _: Duration) -> io::Result<TcpStream> {
-        unsupported()
-    }
-
-    pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0
-    }
-
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0
-    }
-
-    pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn read(&self, _: &mut [u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn read_buf(&self, _buf: BorrowedCursor<'_>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn read_vectored(&self, _: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn is_read_vectored(&self) -> bool {
-        self.0
-    }
-
-    pub fn write(&self, _: &[u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn write_vectored(&self, _: &[IoSlice<'_>]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn is_write_vectored(&self) -> bool {
-        self.0
-    }
-
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        self.0
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        self.0
-    }
-
-    pub fn shutdown(&self, _: Shutdown) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn duplicate(&self) -> io::Result<TcpStream> {
-        self.0
-    }
-
-    pub fn set_linger(&self, _: Option<Duration>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn linger(&self) -> io::Result<Option<Duration>> {
-        self.0
-    }
-
-    pub fn set_nodelay(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn nodelay(&self) -> io::Result<bool> {
-        self.0
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        self.0
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-}
-
-impl fmt::Debug for TcpStream {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.0
-    }
-}
-
-pub struct TcpListener(!);
-
-impl TcpListener {
-    pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<TcpListener> {
-        unsupported()
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        self.0
-    }
-
-    pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
-        self.0
-    }
-
-    pub fn duplicate(&self) -> io::Result<TcpListener> {
-        self.0
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        self.0
-    }
-
-    pub fn set_only_v6(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn only_v6(&self) -> io::Result<bool> {
-        self.0
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-}
-
-impl fmt::Debug for TcpListener {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.0
-    }
-}
-
-pub struct UdpSocket(!);
-
-impl UdpSocket {
-    pub fn bind(_: io::Result<&SocketAddr>) -> io::Result<UdpSocket> {
-        unsupported()
-    }
-
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        self.0
-    }
-
-    pub fn socket_addr(&self) -> io::Result<SocketAddr> {
-        self.0
-    }
-
-    pub fn recv_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.0
-    }
-
-    pub fn peek_from(&self, _: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.0
-    }
-
-    pub fn send_to(&self, _: &[u8], _: &SocketAddr) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn duplicate(&self) -> io::Result<UdpSocket> {
-        self.0
-    }
-
-    pub fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0
-    }
-
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0
-    }
-
-    pub fn set_broadcast(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn broadcast(&self) -> io::Result<bool> {
-        self.0
-    }
-
-    pub fn set_multicast_loop_v4(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
-        self.0
-    }
-
-    pub fn set_multicast_ttl_v4(&self, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
-        self.0
-    }
-
-    pub fn set_multicast_loop_v6(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
-        self.0
-    }
-
-    pub fn join_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn join_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn leave_multicast_v4(&self, _: &Ipv4Addr, _: &Ipv4Addr) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn leave_multicast_v6(&self, _: &Ipv6Addr, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn set_ttl(&self, _: u32) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn ttl(&self) -> io::Result<u32> {
-        self.0
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0
-    }
-
-    pub fn set_nonblocking(&self, _: bool) -> io::Result<()> {
-        self.0
-    }
-
-    pub fn recv(&self, _: &mut [u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn peek(&self, _: &mut [u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn send(&self, _: &[u8]) -> io::Result<usize> {
-        self.0
-    }
-
-    pub fn connect(&self, _: io::Result<&SocketAddr>) -> io::Result<()> {
-        self.0
-    }
-}
-
-impl fmt::Debug for UdpSocket {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.0
-    }
-}
-
-pub struct LookupHost(!);
-
-impl LookupHost {
-    pub fn port(&self) -> u16 {
-        self.0
-    }
-}
-
-impl Iterator for LookupHost {
-    type Item = SocketAddr;
-    fn next(&mut self) -> Option<SocketAddr> {
-        self.0
-    }
-}
-
-impl TryFrom<&str> for LookupHost {
-    type Error = io::Error;
-
-    fn try_from(_v: &str) -> io::Result<LookupHost> {
-        unsupported()
-    }
-}
-
-impl<'a> TryFrom<(&'a str, u16)> for LookupHost {
-    type Error = io::Error;
-
-    fn try_from(_v: (&'a str, u16)) -> io::Result<LookupHost> {
-        unsupported()
-    }
-}
-
-#[allow(nonstandard_style)]
-pub mod netc {
-    pub const AF_INET: u8 = 0;
-    pub const AF_INET6: u8 = 1;
-    pub type sa_family_t = u8;
-
-    #[derive(Copy, Clone)]
-    pub struct in_addr {
-        pub s_addr: u32,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr_in {
-        pub sin_family: sa_family_t,
-        pub sin_port: u16,
-        pub sin_addr: in_addr,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct in6_addr {
-        pub s6_addr: [u8; 16],
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr_in6 {
-        pub sin6_family: sa_family_t,
-        pub sin6_port: u16,
-        pub sin6_addr: in6_addr,
-        pub sin6_flowinfo: u32,
-        pub sin6_scope_id: u32,
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct sockaddr {}
-}
-
-pub type Socket = UdpSocket;
diff --git a/library/std/src/sys/teeos/os.rs b/library/std/src/sys/teeos/os.rs
deleted file mode 100644
index e54a92f01f8..00000000000
--- a/library/std/src/sys/teeos/os.rs
+++ /dev/null
@@ -1,134 +0,0 @@
-//! Implementation of `std::os` functionality for teeos
-
-use core::marker::PhantomData;
-
-use crate::error::Error as StdError;
-use crate::ffi::{OsStr, OsString};
-use crate::fmt;
-use crate::io;
-use crate::path;
-use crate::path::PathBuf;
-
-use super::unsupported;
-
-pub fn errno() -> i32 {
-    unsafe { (*libc::__errno_location()) as i32 }
-}
-
-// Hardcoded to return 4096, since `sysconf` is only implemented as a stub.
-pub fn page_size() -> usize {
-    // unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize };
-    4096
-}
-
-// Everything below are stubs and copied from unsupported.rs
-
-pub fn error_string(_errno: i32) -> String {
-    "error string unimplemented".to_string()
-}
-
-pub fn getcwd() -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub fn chdir(_: &path::Path) -> io::Result<()> {
-    unsupported()
-}
-
-pub struct SplitPaths<'a>(!, PhantomData<&'a ()>);
-
-pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> {
-    panic!("unsupported")
-}
-
-impl<'a> Iterator for SplitPaths<'a> {
-    type Item = PathBuf;
-    fn next(&mut self) -> Option<PathBuf> {
-        self.0
-    }
-}
-
-#[derive(Debug)]
-pub struct JoinPathsError;
-
-pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
-where
-    I: Iterator<Item = T>,
-    T: AsRef<OsStr>,
-{
-    Err(JoinPathsError)
-}
-
-impl fmt::Display for JoinPathsError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        "not supported on this platform yet".fmt(f)
-    }
-}
-
-impl StdError for JoinPathsError {
-    #[allow(deprecated)]
-    fn description(&self) -> &str {
-        "not supported on this platform yet"
-    }
-}
-
-pub fn current_exe() -> io::Result<PathBuf> {
-    unsupported()
-}
-
-pub struct Env(!);
-
-impl Env {
-    // FIXME(https://github.com/rust-lang/rust/issues/114583): Remove this when <OsStr as Debug>::fmt matches <str as Debug>::fmt.
-    pub fn str_debug(&self) -> impl fmt::Debug + '_ {
-        let Self(inner) = self;
-        match *inner {}
-    }
-}
-
-impl fmt::Debug for Env {
-    fn fmt(&self, _: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let Self(inner) = self;
-        match *inner {}
-    }
-}
-
-impl Iterator for Env {
-    type Item = (OsString, OsString);
-    fn next(&mut self) -> Option<(OsString, OsString)> {
-        let Self(inner) = self;
-        match *inner {}
-    }
-}
-
-pub fn env() -> Env {
-    panic!("not supported on this platform")
-}
-
-pub fn getenv(_: &OsStr) -> Option<OsString> {
-    None
-}
-
-pub fn setenv(_: &OsStr, _: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Unsupported, "cannot set env vars on this platform"))
-}
-
-pub fn unsetenv(_: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Unsupported, "cannot unset env vars on this platform"))
-}
-
-pub fn temp_dir() -> PathBuf {
-    panic!("no filesystem on this platform")
-}
-
-pub fn home_dir() -> Option<PathBuf> {
-    None
-}
-
-pub fn exit(_code: i32) -> ! {
-    panic!("TA should not call `exit`")
-}
-
-pub fn getpid() -> u32 {
-    panic!("no pids on this platform")
-}
diff --git a/library/std/src/sys/teeos/rand.rs b/library/std/src/sys/teeos/rand.rs
deleted file mode 100644
index b45c3bb40e7..00000000000
--- a/library/std/src/sys/teeos/rand.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-pub fn hashmap_random_keys() -> (u64, u64) {
-    const KEY_LEN: usize = core::mem::size_of::<u64>();
-
-    let mut v = [0u8; KEY_LEN * 2];
-    imp::fill_bytes(&mut v);
-
-    let key1 = v[0..KEY_LEN].try_into().unwrap();
-    let key2 = v[KEY_LEN..].try_into().unwrap();
-
-    (u64::from_ne_bytes(key1), u64::from_ne_bytes(key2))
-}
-
-mod imp {
-    extern "C" {
-        fn TEE_GenerateRandom(randomBuffer: *mut core::ffi::c_void, randomBufferLen: libc::size_t);
-    }
-
-    pub fn fill_bytes(v: &mut [u8]) {
-        unsafe { TEE_GenerateRandom(v.as_mut_ptr() as _, v.len() * crate::mem::size_of::<u8>()) }
-    }
-}
diff --git a/library/std/src/sys/teeos/stdio.rs b/library/std/src/sys/teeos/stdio.rs
deleted file mode 100644
index 9ca04f29273..00000000000
--- a/library/std/src/sys/teeos/stdio.rs
+++ /dev/null
@@ -1,88 +0,0 @@
-#![deny(unsafe_op_in_unsafe_fn)]
-
-use crate::io;
-use core::arch::asm;
-
-pub struct Stdin;
-pub struct Stdout;
-pub struct Stderr;
-
-const KCALL_DEBUG_CMD_PUT_BYTES: i64 = 2;
-
-unsafe fn debug_call(cap_ref: u64, call_no: i64, arg1: u64, arg2: u64) -> i32 {
-    let ret: u64;
-    unsafe {
-        asm!(
-            "svc #99",
-            inout("x0") cap_ref => ret,
-            in("x1") call_no,
-            in("x2") arg1,
-            in("x3") arg2,
-        );
-    }
-
-    ret as i32
-}
-
-fn print_buf(s: &[u8]) -> io::Result<usize> {
-    // Corresponds to `HM_DEBUG_PUT_BYTES_LIMIT`.
-    const MAX_LEN: usize = 512;
-    let len = if s.len() > MAX_LEN { MAX_LEN } else { s.len() };
-    let result = unsafe { debug_call(0, KCALL_DEBUG_CMD_PUT_BYTES, s.as_ptr() as u64, len as u64) };
-
-    if result == 0 { Ok(len) } else { Err(io::Error::from(io::ErrorKind::InvalidInput)) }
-}
-
-impl Stdin {
-    pub const fn new() -> Stdin {
-        Stdin
-    }
-}
-
-impl io::Read for Stdin {
-    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
-        Ok(0)
-    }
-}
-
-impl Stdout {
-    pub const fn new() -> Stdout {
-        Stdout
-    }
-}
-
-impl io::Write for Stdout {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        print_buf(buf)
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-impl Stderr {
-    pub const fn new() -> Stderr {
-        Stderr
-    }
-}
-
-impl io::Write for Stderr {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        print_buf(buf)
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-pub const STDIN_BUF_SIZE: usize = 0;
-
-pub fn is_ebadf(err: &io::Error) -> bool {
-    err.raw_os_error() == Some(libc::EBADF as i32)
-}
-
-pub fn panic_output() -> Option<impl io::Write> {
-    Some(Stderr::new())
-}
diff --git a/library/std/src/sys/teeos/thread.rs b/library/std/src/sys/teeos/thread.rs
deleted file mode 100644
index 155f333f906..00000000000
--- a/library/std/src/sys/teeos/thread.rs
+++ /dev/null
@@ -1,164 +0,0 @@
-use core::convert::TryInto;
-
-use crate::cmp;
-use crate::ffi::CStr;
-use crate::io;
-use crate::mem;
-use crate::num::NonZeroUsize;
-use crate::ptr;
-use crate::sys::os;
-use crate::time::Duration;
-
-pub const DEFAULT_MIN_STACK_SIZE: usize = 8 * 1024;
-
-pub struct Thread {
-    id: libc::pthread_t,
-}
-
-// Some platforms may have pthread_t as a pointer in which case we still want
-// a thread to be Send/Sync
-unsafe impl Send for Thread {}
-unsafe impl Sync for Thread {}
-
-extern "C" {
-    pub fn TEE_Wait(timeout: u32) -> u32;
-}
-
-impl Thread {
-    // unsafe: see thread::Builder::spawn_unchecked for safety requirements
-    pub unsafe fn new(stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
-        let p = Box::into_raw(Box::new(p));
-        let mut native: libc::pthread_t = mem::zeroed();
-        let mut attr: libc::pthread_attr_t = mem::zeroed();
-        assert_eq!(libc::pthread_attr_init(&mut attr), 0);
-        assert_eq!(
-            libc::pthread_attr_settee(
-                &mut attr,
-                libc::TEESMP_THREAD_ATTR_CA_INHERIT,
-                libc::TEESMP_THREAD_ATTR_TASK_ID_INHERIT,
-                libc::TEESMP_THREAD_ATTR_HAS_SHADOW,
-            ),
-            0,
-        );
-
-        let stack_size = cmp::max(stack, min_stack_size(&attr));
-
-        match libc::pthread_attr_setstacksize(&mut attr, stack_size) {
-            0 => {}
-            n => {
-                assert_eq!(n, libc::EINVAL);
-                // EINVAL means |stack_size| is either too small or not a
-                // multiple of the system page size.  Because it's definitely
-                // >= PTHREAD_STACK_MIN, it must be an alignment issue.
-                // Round up to the nearest page and try again.
-                let page_size = os::page_size();
-                let stack_size =
-                    (stack_size + page_size - 1) & (-(page_size as isize - 1) as usize - 1);
-                assert_eq!(libc::pthread_attr_setstacksize(&mut attr, stack_size), 0);
-            }
-        };
-
-        let ret = libc::pthread_create(&mut native, &attr, thread_start, p as *mut _);
-        // Note: if the thread creation fails and this assert fails, then p will
-        // be leaked. However, an alternative design could cause double-free
-        // which is clearly worse.
-        assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
-
-        return if ret != 0 {
-            // The thread failed to start and as a result p was not consumed. Therefore, it is
-            // safe to reconstruct the box so that it gets deallocated.
-            drop(Box::from_raw(p));
-            Err(io::Error::from_raw_os_error(ret))
-        } else {
-            // The new thread will start running earliest after the next yield.
-            // We add a yield here, so that the user does not have to.
-            Thread::yield_now();
-            Ok(Thread { id: native })
-        };
-
-        extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
-            unsafe {
-                // Next, set up our stack overflow handler which may get triggered if we run
-                // out of stack.
-                // this is not necessary in TEE.
-                //let _handler = stack_overflow::Handler::new();
-                // Finally, let's run some code.
-                Box::from_raw(main as *mut Box<dyn FnOnce()>)();
-            }
-            ptr::null_mut()
-        }
-    }
-
-    pub fn yield_now() {
-        let ret = unsafe { libc::sched_yield() };
-        debug_assert_eq!(ret, 0);
-    }
-
-    /// This does not do anything on teeos
-    pub fn set_name(_name: &CStr) {
-        // Both pthread_setname_np and prctl are not available to the TA,
-        // so we can't implement this currently. If the need arises please
-        // contact the teeos rustzone team.
-    }
-
-    /// only main thread could wait for sometime in teeos
-    pub fn sleep(dur: Duration) {
-        let sleep_millis = dur.as_millis();
-        let final_sleep: u32 =
-            if sleep_millis >= u32::MAX as u128 { u32::MAX } else { sleep_millis as u32 };
-        unsafe {
-            let _ = TEE_Wait(final_sleep);
-        }
-    }
-
-    /// must join, because no pthread_detach supported
-    pub fn join(self) {
-        unsafe {
-            let ret = libc::pthread_join(self.id, ptr::null_mut());
-            mem::forget(self);
-            assert!(ret == 0, "failed to join thread: {}", io::Error::from_raw_os_error(ret));
-        }
-    }
-
-    pub fn id(&self) -> libc::pthread_t {
-        self.id
-    }
-
-    pub fn into_id(self) -> libc::pthread_t {
-        let id = self.id;
-        mem::forget(self);
-        id
-    }
-}
-
-impl Drop for Thread {
-    fn drop(&mut self) {
-        // we can not call detach, so just panic if thread spawn without join
-        panic!("thread must join, detach is not supported!");
-    }
-}
-
-// Note: Both `sched_getaffinity` and `sysconf` are available but not functional on
-// teeos, so this function always returns an Error!
-pub fn available_parallelism() -> io::Result<NonZeroUsize> {
-    Err(io::Error::new(
-        io::ErrorKind::NotFound,
-        "The number of hardware threads is not known for the target platform",
-    ))
-}
-
-// stub
-pub mod guard {
-    use crate::ops::Range;
-    pub type Guard = Range<usize>;
-    pub unsafe fn current() -> Option<Guard> {
-        None
-    }
-    pub unsafe fn init() -> Option<Guard> {
-        None
-    }
-}
-
-fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
-    libc::PTHREAD_STACK_MIN.try_into().expect("Infallible")
-}
diff --git a/library/std/src/sys/teeos/thread_local_dtor.rs b/library/std/src/sys/teeos/thread_local_dtor.rs
deleted file mode 100644
index 5c6bc4d6750..00000000000
--- a/library/std/src/sys/teeos/thread_local_dtor.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
-    use crate::sys_common::thread_local_dtor::register_dtor_fallback;
-    register_dtor_fallback(t, dtor);
-}