1 files changed, 36 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model/aarch64/fmv/android.inc b/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model/aarch64/fmv/android.inc
new file mode 100644
index 000000000000..f711431489cc
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model/aarch64/fmv/android.inc
@@ -0,0 +1,36 @@
+void __init_cpu_features_resolver(unsigned long hwcap,
+                                  const __ifunc_arg_t *arg) {
+  if (__aarch64_cpu_features.features)
+    return;
+
+  // ifunc resolvers don't have hwcaps in arguments on Android API lower
+  // than 30. If so, set feature detection done and keep all CPU features
+  // unsupported (zeros). To detect this case in runtime we check existence
+  // of memfd_create function from Standard C library which was introduced in
+  // Android API 30.
+  int memfd_create(const char *, unsigned int) __attribute__((weak));
+  if (!memfd_create)
+    return;
+
+  __init_cpu_features_constructor(hwcap, arg);
+}
+
+void CONSTRUCTOR_ATTRIBUTE __init_cpu_features(void) {
+  // CPU features already initialized.
+  if (__aarch64_cpu_features.features)
+    return;
+
+  // Don't set any CPU features,
+  // detection could be wrong on Exynos 9810.
+  if (__isExynos9810())
+    return;
+
+  unsigned long hwcap = getauxval(AT_HWCAP);
+  unsigned long hwcap2 = getauxval(AT_HWCAP2);
+
+  __ifunc_arg_t arg;
+  arg._size = sizeof(__ifunc_arg_t);
+  arg._hwcap = hwcap;
+  arg._hwcap2 = hwcap2;
+  __init_cpu_features_constructor(hwcap | _IFUNC_ARG_HWCAP, &arg);
+}