[libc] add __stack_chk_fail and abort to uefi

Author: RossComputerGuy

libc/config/uefi/entrypoints.txt

@@ -1,4 +1,6 @@
 set(TARGET_LIBC_ENTRYPOINTS
+    libc.src.compiler.__stack_chk_fail
+
     # ctype.h entrypoints
     libc.src.ctype.isalnum
     libc.src.ctype.isalpha
@@ -152,6 +154,7 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # stdlib.h entrypoints
     libc.src.stdlib._Exit
+    libc.src.stdlib.abort
     libc.src.stdlib.abs
     libc.src.stdlib.aligned_alloc
     libc.src.stdlib.atof

libc/src/stdlib/uefi/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_entrypoint_object(
+  abort
+  SRCS
+    abort.cpp
+  HDRS
+    ../abort.h
+)

libc/src/stdlib/uefi/abort.cpp

@@ -0,0 +1,18 @@
+//===-- Implementation of abort -------------------------------------------===//
+//
+// 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/common.h"
+#include "src/__support/macros/config.h"
+
+#include "src/stdlib/abort.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(void, abort, ()) { __builtin_trap(); }
+
+} // namespace LIBC_NAMESPACE_DECL