1 files changed, 146 insertions, 0 deletions
diff --git a/library/std/src/sys/hermit/mod.rs b/library/std/src/sys/hermit/mod.rs
new file mode 100644
index 00000000000..675b82ceb77
--- /dev/null
+++ b/library/std/src/sys/hermit/mod.rs
@@ -0,0 +1,146 @@
+//! System bindings for HermitCore
+//!
+//! This module contains the facade (aka platform-specific) implementations of
+//! OS level functionality for HermitCore.
+//!
+//! This is all super highly experimental and not actually intended for
+//! wide/production use yet, it's still all in the experimental category. This
+//! will likely change over time.
+//!
+//! Currently all functions here are basically stubs that immediately return
+//! errors. The hope is that with a portability lint we can turn actually just
+//! remove all this and just omit parts of the standard library if we're
+//! compiling for wasm. That way it's a compile time error for something that's
+//! guaranteed to be a runtime error!
+
+use crate::intrinsics;
+use crate::os::raw::c_char;
+
+pub mod alloc;
+pub mod args;
+pub mod cmath;
+pub mod condvar;
+pub mod env;
+pub mod ext;
+pub mod fd;
+pub mod fs;
+pub mod io;
+pub mod memchr;
+pub mod mutex;
+pub mod net;
+pub mod os;
+pub mod path;
+pub mod pipe;
+pub mod process;
+pub mod rwlock;
+pub mod stack_overflow;
+pub mod stdio;
+pub mod thread;
+pub mod thread_local_dtor;
+pub mod thread_local_key;
+pub mod time;
+
+use crate::io::ErrorKind;
+pub use crate::sys_common::os_str_bytes as os_str;
+
+#[allow(unused_extern_crates)]
+pub extern crate hermit_abi as abi;
+
+pub fn unsupported<T>() -> crate::io::Result<T> {
+    Err(unsupported_err())
+}
+
+pub fn unsupported_err() -> crate::io::Error {
+    crate::io::Error::new(crate::io::ErrorKind::Other, "operation not supported on HermitCore yet")
+}
+
+// This enum is used as the storage for a bunch of types which can't actually
+// exist.
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
+pub enum Void {}
+
+pub unsafe fn strlen(start: *const c_char) -> usize {
+    let mut str = start;
+
+    while *str != 0 {
+        str = str.offset(1);
+    }
+
+    (str as usize) - (start as usize)
+}
+
+#[no_mangle]
+pub extern "C" fn floor(x: f64) -> f64 {
+    unsafe { intrinsics::floorf64(x) }
+}
+
+pub fn abort_internal() -> ! {
+    unsafe {
+        abi::abort();
+    }
+}
+
+// FIXME: just a workaround to test the system
+pub fn hashmap_random_keys() -> (u64, u64) {
+    (1, 2)
+}
+
+// This function is needed by the panic runtime. The symbol is named in
+// pre-link args for the target specification, so keep that in sync.
+#[cfg(not(test))]
+#[no_mangle]
+// NB. used by both libunwind and libpanic_abort
+pub extern "C" fn __rust_abort() {
+    abort_internal();
+}
+
+#[cfg(not(test))]
+pub fn init() {
+    let _ = net::init();
+}
+
+#[cfg(not(test))]
+#[no_mangle]
+pub unsafe extern "C" fn runtime_entry(
+    argc: i32,
+    argv: *const *const c_char,
+    env: *const *const c_char,
+) -> ! {
+    use crate::sys::hermit::fast_thread_local::run_dtors;
+    extern "C" {
+        fn main(argc: isize, argv: *const *const c_char) -> i32;
+    }
+
+    // initialize environment
+    os::init_environment(env as *const *const i8);
+
+    let result = main(argc as isize, argv);
+
+    run_dtors();
+    abi::exit(result);
+}
+
+pub fn decode_error_kind(errno: i32) -> ErrorKind {
+    match errno {
+        x if x == 13 as i32 => ErrorKind::PermissionDenied,
+        x if x == 98 as i32 => ErrorKind::AddrInUse,
+        x if x == 99 as i32 => ErrorKind::AddrNotAvailable,
+        x if x == 11 as i32 => ErrorKind::WouldBlock,
+        x if x == 103 as i32 => ErrorKind::ConnectionAborted,
+        x if x == 111 as i32 => ErrorKind::ConnectionRefused,
+        x if x == 104 as i32 => ErrorKind::ConnectionReset,
+        x if x == 17 as i32 => ErrorKind::AlreadyExists,
+        x if x == 4 as i32 => ErrorKind::Interrupted,
+        x if x == 22 as i32 => ErrorKind::InvalidInput,
+        x if x == 2 as i32 => ErrorKind::NotFound,
+        x if x == 107 as i32 => ErrorKind::NotConnected,
+        x if x == 1 as i32 => ErrorKind::PermissionDenied,
+        x if x == 32 as i32 => ErrorKind::BrokenPipe,
+        x if x == 110 as i32 => ErrorKind::TimedOut,
+        _ => ErrorKind::Other,
+    }
+}
+
+pub fn cvt(result: i32) -> crate::io::Result<usize> {
+    if result < 0 { Err(crate::io::Error::from_raw_os_error(-result)) } else { Ok(result as usize) }
+}