[libc] Add definitions to embedded AArch32/AArch64 (#142597)
Add `CLOCKS_PER_SEC` and the older `CLK_TCK`. Allows the user to define
a `__CLK_TCK` to override if necessary.
Also add an extra column for embedded AArch64 in `time.rst`
diff --git a/libc/docs/headers/time.rst b/libc/docs/headers/time.rst
index de82d80..9733a17 100644
--- a/libc/docs/headers/time.rst
+++ b/libc/docs/headers/time.rst
@@ -42,72 +42,74 @@
* To check date and time functions enabled for embedded system:
+ - `barebone-aarch64 <https://github.com/llvm/llvm-project/tree/main/libc/config/baremetal/aarch64/entrypoints.txt>`_
+
- `barebone-aarch32 <https://github.com/llvm/llvm-project/tree/main/libc/config/baremetal/arm/entrypoints.txt>`_
- barebone-riscv32 - to be added
-+---------------------+-----------------------------------------------+-------------------+-------------------+-------------------+-------------------+
-| <Func> | Linux | Windows | MacOS | Embedded | GPU |
-| +---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| | x86_64 | aarch64 | aarch32 | riscv64/riscv32 | x86_64 | aarch64 | x86_64 | aarch64 | aarch32 | riscv32 | AMD | nVidia |
-+=====================+=========+=========+=========+=================+=========+=========+=========+=========+=========+=========+=========+=========+
-| asctime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| asctime_r | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| ctime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| ctime_r | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock_getcpuclockid | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock_getres | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock_gettime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock_nanosleep | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| clock_settime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| ctime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| ctime_r | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| difftime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| getdate | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| gettimeofday | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| gmtime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| gmtime_r | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| localtime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| localtime_r | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| mktime | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| nanosleep | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| strftime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| strptime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| time | |check| | |check| | | |check| | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| timer_create | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| timer_delete | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| timer_gettime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| timer_getoverrun | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| timer_settime | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
-| tzset | | | | | | | | | | | | |
-+---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+
++---------------------+-----------------------------------------------+-------------------+-------------------+-----------------------------+---------+---------+
+| <Func> | Linux | Windows | MacOS | Embedded | GPU |
+| +---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| | x86_64 | aarch64 | aarch32 | riscv64/riscv32 | x86_64 | aarch64 | x86_64 | aarch64 | aarch64 | aarch32 | riscv32 | AMD | nVidia |
++=====================+=========+=========+=========+=================+=========+=========+=========+=========+=========+=========+=========+=========+=========+
+| asctime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| asctime_r | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| ctime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| ctime_r | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock_getcpuclockid | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock_getres | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock_gettime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock_nanosleep | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| clock_settime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| ctime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| ctime_r | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| difftime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| getdate | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| gettimeofday | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| gmtime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| gmtime_r | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| localtime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| localtime_r | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| mktime | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| nanosleep | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| strftime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| strptime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| time | |check| | |check| | | |check| | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| timer_create | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| timer_delete | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| timer_gettime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| timer_getoverrun | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| timer_settime | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
+| tzset | | | | | | | | | | | | | |
++---------------------+---------+---------+---------+-----------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
\ No newline at end of file
diff --git a/libc/include/llvm-libc-macros/baremetal/CMakeLists.txt b/libc/include/llvm-libc-macros/baremetal/CMakeLists.txt
new file mode 100644
index 0000000..ea08c63
--- /dev/null
+++ b/libc/include/llvm-libc-macros/baremetal/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_header(
+ time_macros
+ HDR
+ time-macros.h
+)
diff --git a/libc/include/llvm-libc-macros/baremetal/time-macros.h b/libc/include/llvm-libc-macros/baremetal/time-macros.h
new file mode 100644
index 0000000..3537376
--- /dev/null
+++ b/libc/include/llvm-libc-macros/baremetal/time-macros.h
@@ -0,0 +1,26 @@
+//===-- 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)
+// This default implementation of this function shall use semihosting
+// Semihosting measures time in centiseconds
+// https://github.com/ARM-software/abi-aa/blob/main/semihosting/semihosting.rst#sys-clock-0x10
+#define CLOCKS_PER_SEC 100
+#else
+#define CLOCKS_PER_SEC 1000000
+#endif
+#endif
+
+#endif // LLVM_LIBC_MACROS_BAREMETAL_TIME_MACROS_H
diff --git a/libc/include/llvm-libc-macros/time-macros.h b/libc/include/llvm-libc-macros/time-macros.h
index 445d8b3..30e0a31 100644
--- a/libc/include/llvm-libc-macros/time-macros.h
+++ b/libc/include/llvm-libc-macros/time-macros.h
@@ -5,8 +5,14 @@
#include "gpu/time-macros.h"
#elif defined(__linux__)
#include "linux/time-macros.h"
+#elif defined(__ELF__)
+#include "baremetal/time-macros.h"
+#else
+#define CLOCKS_PER_SEC 1000000
#endif
+#define CLK_TCK CLOCKS_PER_SEC
+
#define TIME_UTC 1
#define TIME_MONOTONIC 2
#define TIME_ACTIVE 3
