xtensa: Add time64 support.

- xtensa is the second architecture that supports
time64 inside uClibc-ng.
- Linux Kernel always uses 32bit time variables
inside `stat` structures, so there is a need
to use `st_atime`, `st_mtime` and `st_ctime` structures with the same
32bit-wide `tv_sec` and `tv_nsec` variables even if time64 is enabled.

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

extra/Configs/Config.in

@@ -1026,7 +1026,7 @@ config UCLIBC_FALLBACK_TO_ETC_LOCALTIME
 
 config UCLIBC_USE_TIME64
 	bool "Use *time64 syscalls instead of 32bit ones (if possible)"
-	depends on TARGET_arm
+	depends on TARGET_arm || TARGET_xtensa
 	# TODO: add support for other architectures
 	default n
 

libc/sysdeps/linux/xtensa/bits/kernel_stat.h

@@ -5,6 +5,16 @@
  * struct kernel_stat should look like...  It turns out each arch has a
  * different opinion on the subject... */
 
+#if defined(__UCLIBC_USE_TIME64__)
+#include <bits/types.h>
+
+struct ts32_struct {
+	__S32_TYPE tv_sec;
+	__S32_TYPE tv_nsec;
+};
+
+#endif
+
 struct kernel_stat {
 	unsigned long	st_dev;
 	unsigned long	st_ino;
@@ -16,9 +26,15 @@ struct kernel_stat {
 	long		st_size;
 	unsigned long	st_blksize;
 	unsigned long	st_blocks;
+#if defined(__UCLIBC_USE_TIME64__)
+	struct ts32_struct __st_atim32;
+	struct ts32_struct __st_mtim32;
+	struct ts32_struct __st_ctim32;
+#else
 	struct timespec	st_atim;
 	struct timespec	st_mtim;
 	struct timespec	st_ctim;
+#endif
 	unsigned long	__unused4;
 	unsigned long	__unused5;
 };
@@ -35,9 +51,15 @@ struct kernel_stat64 {
 	unsigned long st_blksize;	/* Optimal block size for I/O. */
 	unsigned long __uclibc_unused2;
 	unsigned long long st_blocks;	/* Number 512-byte blocks allocated. */
+#if defined(__UCLIBC_USE_TIME64__)
+	struct ts32_struct __st_atim32;
+	struct ts32_struct __st_mtim32;
+	struct ts32_struct __st_ctim32;
+#else
 	struct timespec st_atim;	/* Time of last access. */
 	struct timespec st_mtim;	/* Time of last modification. */
 	struct timespec st_ctim;	/* Time of last status change. */
+#endif
 	unsigned long __uclibc_unused4;
 	unsigned long __uclibc_unused5;
 };