chore: checkpoint before Python removal

vendor/ring/crypto/crypto.c

@@ -0,0 +1,34 @@
+// Copyright 2014 The BoringSSL Authors
+//
+// Licensed 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
+//
+//     https://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.
+
+#include <ring-core/base.h>
+
+// Our assembly does not use the GOT to reference symbols, which means
+// references to visible symbols will often require a TEXTREL. This is
+// undesirable, so all assembly-referenced symbols should be hidden. CPU
+// capabilities are the only such symbols defined in C. Explicitly hide them,
+// rather than rely on being built with -fvisibility=hidden.
+#if defined(OPENSSL_WINDOWS)
+#define HIDDEN
+#else
+#define HIDDEN __attribute__((visibility("hidden")))
+#endif
+
+#if defined(OPENSSL_X86_64)
+// These are declared as `AtomicU32` on the Rust side.
+HIDDEN uint32_t avx2_available = 0;
+HIDDEN uint32_t adx_bmi2_available = 0;
+#elif defined(OPENSSL_ARM)
+HIDDEN uint32_t neon_available = 0;
+#endif