[libc-commits] [libc] [libc] init uefi os target (PR #120687)

[Joseph Huber via libc-commits]

================
@@ -0,0 +1,24 @@
+//===-------- UEFI implementation of an exit function ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/exit.h"
+#include "include/llvm-libc-macros/stdlib-macros.h"
+#include "src/__support/macros/config.h"
+#include <Uefi.h>
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+[[noreturn]] void exit(int status) {
+  efi_system_table->BootServices->Exit(efi_image_handle, status, 0, NULL);
+  while (true)
+    ;
----------------
jhuber6 wrote:

Then use `__builtin_unreachable`. The way the code was written I interpreted this as the shutdown happening in the background so we want the thread to spin until the program dies.

https://github.com/llvm/llvm-project/pull/120687