Add more from the std

library/std/src/sys/personality/mod.rs

@@ -0,0 +1,50 @@
+//! This module contains the implementation of the `eh_personality` lang item.
+//!
+//! The actual implementation is heavily dependent on the target since Rust
+//! tries to use the native stack unwinding mechanism whenever possible.
+//!
+//! This personality function is still required with `-C panic=abort` because
+//! it is used to catch foreign exceptions from `extern "C-unwind"` and turn
+//! them into aborts.
+//!
+//! Additionally, ARM EHABI uses the personality function when generating
+//! backtraces.
+
+mod dwarf;
+
+#[cfg(not(any(test, doctest)))]
+cfg_select! {
+    target_os = "emscripten" => {
+        mod emcc;
+    }
+    any(target_env = "msvc", target_family = "wasm", target_os = "motor") => {
+        // This is required by the compiler to exist (e.g., it's a lang item),
+        // but it's never actually called by the compiler because
+        // __CxxFrameHandler3 (msvc) / __gxx_wasm_personality_v0 (wasm) is the
+        // personality function that is always used.  Hence this is just an
+        // aborting stub.
+        #[lang = "eh_personality"]
+        fn rust_eh_personality() {
+            core::intrinsics::abort()
+        }
+    }
+    any(
+        all(target_family = "windows", target_env = "gnu"),
+        target_os = "psp",
+        target_os = "xous",
+        target_os = "solid_asp3",
+        all(target_family = "unix", not(target_os = "espidf"), not(target_os = "l4re"), not(target_os = "nuttx")),
+        all(target_vendor = "fortanix", target_env = "sgx"),
+    ) => {
+        mod gcc;
+    }
+    _ => {
+        // Targets that don't support unwinding.
+        // - os=none ("bare metal" targets)
+        // - os=uefi
+        // - os=espidf
+        // - os=hermit
+        // - nvptx64-nvidia-cuda
+        // - arch=avr
+    }
+}