Port std library to RTEMS

Author: thesummer

library/core/src/ffi/mod.rs

@@ -101,7 +101,7 @@ mod c_char_definition {
             all(target_os = "android", any(target_arch = "aarch64", target_arch = "arm")),
             all(target_os = "l4re", target_arch = "x86_64"),
             all(
-                any(target_os = "freebsd", target_os = "openbsd"),
+                any(target_os = "freebsd", target_os = "openbsd", target_os = "rtems"),
                 any(
                     target_arch = "aarch64",
                     target_arch = "arm",

library/panic_unwind/src/lib.rs

@@ -53,7 +53,7 @@ cfg_if::cfg_if! {
         target_os = "psp",
         target_os = "xous",
         target_os = "solid_asp3",
-        all(target_family = "unix", not(target_os = "espidf")),
+        all(target_family = "unix", not(any(target_os = "espidf", target_os = "rtems"))),
         all(target_vendor = "fortanix", target_env = "sgx"),
         target_family = "wasm",
     ))] {

library/panic_unwind/src/rtems.rs

@@ -0,0 +1,22 @@
+//! Unwinding for *rtems* target.
+//!
+//! Right now we don't support this, so this is just stubs.
+
+use alloc::boxed::Box;
+use core::any::Any;
+
+pub unsafe fn cleanup(_ptr: *mut u8) -> Box<dyn Any + Send> {
+    extern "C" {
+        pub fn rtems_panic(fmt: *const ::std::os::raw::c_char, ...) -> !;
+    }
+
+    rtems_panic("Error during Rust execution".into_raw());
+}
+
+pub unsafe fn panic(_data: Box<dyn Any + Send>) -> u32 {
+    extern "C" {
+        pub fn rtems_panic(fmt: *const ::std::os::raw::c_char, ...) -> !;
+    }
+
+    rtems_panic("Error during Rust execution".into_raw());
+}

library/std/build.rs

@@ -52,6 +52,7 @@ fn main() {
         || target_os == "uefi"
         || target_os == "teeos"
         || target_os == "zkvm"
+        || target_os == "rtems"
 
         // See src/bootstrap/src/core/build_steps/synthetic_targets.rs
         || env::var("RUSTC_BOOTSTRAP_SYNTHETIC_TARGET").is_ok()

library/std/src/os/mod.rs

@@ -140,6 +140,8 @@ pub mod nto;
 pub mod openbsd;
 #[cfg(target_os = "redox")]
 pub mod redox;
+#[cfg(target_os = "rtems")]
+pub mod rtems;
 #[cfg(target_os = "solaris")]
 pub mod solaris;
 #[cfg(target_os = "solid_asp3")]