[libc] Add definitions to embedded AArch32/AArch64

libc/include/llvm-libc-macros/baremetal/CMakeLists.txt

@@ -0,0 +1,5 @@
+add_header(
+  time_macros
+  HDR
+    time-macros.h
+)

libc/include/llvm-libc-macros/baremetal/time-macros.h

@@ -0,0 +1,24 @@
+//===-- Definition of macros from time.h ---------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
+#define LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
+
+#ifdef __CLK_TCK
+#define CLOCKS_PER_SEC __CLK_TCK
+#else
+#if defined(__arm__) || defined(_M_ARM) || defined(__aarch64__) ||             \
+    defined(__arm64__) || defined(_M_ARM64)
+// Semihosting uses centiseconds as default
+#define CLOCKS_PER_SEC 100
+#else
+#define CLOCKS_PER_SEC 1000000
+#endif
+#endif
+
+#endif // LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H

libc/include/llvm-libc-macros/time-macros.h

@@ -5,13 +5,8 @@
 #include "gpu/time-macros.h"
 #elif defined(__linux__)
 #include "linux/time-macros.h"
-#elif defined(__arm__) || defined(_M_ARM) || defined(__aarch64__)
-#ifdef __CLK_TCK
-#define CLOCKS_PER_SEC __CLK_TCK
 #else
-// Semihosting uses centiseconds as default
-#define CLOCKS_PER_SEC 100
-#endif
+#include "baremetal/time-macros.h"
 #endif
 
 #define CLK_TCK CLOCKS_PER_SEC