| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| #![no_std] |
| #![cfg_attr(target_env = "sgx", feature(rustc_private))] |
| #![feature(lang_items)] |
| #![feature(alloc_error_handler)] |
| |
| extern crate alloc as alloc_crate; |
| |
| #[cfg(target_env = "sgx")] |
| extern crate sgx_alloc; |
| |
| use core::alloc::Layout; |
| use core::panic::PanicInfo; |
| use core::sync::atomic::{AtomicPtr, Ordering}; |
| use core::{mem, ptr}; |
| |
| pub use alloc_crate::alloc::*; |
| pub use sgx_alloc::System; |
| |
| #[global_allocator] |
| static ALLOC: sgx_alloc::System = sgx_alloc::System; |
| |
| #[panic_handler] |
| fn begin_panic_handler(_info: &PanicInfo<'_>) -> ! { |
| sgx_abort(); |
| } |
| |
| #[lang = "eh_personality"] |
| #[no_mangle] |
| unsafe extern "C" fn rust_eh_personality() {} |
| |
| static HOOK: AtomicPtr<()> = AtomicPtr::new(ptr::null_mut()); |
| |
| /// Registers a custom allocation error hook, replacing any that was previously registered. |
| /// |
| /// The allocation error hook is invoked when an infallible memory allocation fails, before |
| /// the runtime aborts. The default hook prints a message to standard error, |
| /// but this behavior can be customized with the [`set_alloc_error_hook`] and |
| /// [`take_alloc_error_hook`] functions. |
| /// |
| /// The hook is provided with a `Layout` struct which contains information |
| /// about the allocation that failed. |
| /// |
| /// The allocation error hook is a global resource. |
| pub fn set_alloc_error_hook(hook: fn(Layout)) { |
| HOOK.store(hook as *mut (), Ordering::SeqCst); |
| } |
| |
| /// Unregisters the current allocation error hook, returning it. |
| /// |
| /// *See also the function [`set_alloc_error_hook`].* |
| /// |
| /// If no custom hook is registered, the default hook will be returned. |
| pub fn take_alloc_error_hook() -> fn(Layout) { |
| let hook = HOOK.swap(ptr::null_mut(), Ordering::SeqCst); |
| if hook.is_null() { |
| default_alloc_error_hook |
| } else { |
| unsafe { mem::transmute(hook) } |
| } |
| } |
| |
| fn default_alloc_error_hook(_layout: Layout) {} |
| |
| #[alloc_error_handler] |
| pub fn rust_oom(layout: Layout) -> ! { |
| let hook = HOOK.load(Ordering::SeqCst); |
| let hook: fn(Layout) = if hook.is_null() { |
| default_alloc_error_hook |
| } else { |
| unsafe { mem::transmute(hook) } |
| }; |
| hook(layout); |
| sgx_abort(); |
| } |
| |
| #[link(name = "sgx_trts")] |
| extern "C" { |
| pub fn abort() -> !; |
| } |
| |
| fn sgx_abort() -> ! { |
| unsafe { abort() } |
| } |