1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libsys/aarch64/__vdso_gettc.c b/lib/libsys/aarch64/__vdso_gettc.c
new file mode 100644
index 000000000000..5c5963d0e757
--- /dev/null
+++ b/lib/libsys/aarch64/__vdso_gettc.c
@@ -0,0 +1,73 @@
+/*-
+ * Copyright (c) 2015 The FreeBSD Foundation
+ *
+ * This software was developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/elf.h>
+#include <sys/time.h>
+#include <sys/vdso.h>
+#include <machine/cpufunc.h>
+#include <errno.h>
+#include "libc_private.h"
+
+static inline uint64_t
+cp15_cntvct_get(void)
+{
+	uint64_t reg;
+
+	__asm __volatile("mrs %0, cntvct_el0" : "=r" (reg));
+	return (reg);
+}
+
+static inline uint64_t
+cp15_cntpct_get(void)
+{
+	uint64_t reg;
+
+	__asm __volatile("mrs %0, cntpct_el0" : "=r" (reg));
+	return (reg);
+}
+
+#pragma weak __vdso_gettc
+int
+__vdso_gettc(const struct vdso_timehands *th, u_int *tc)
+{
+
+	if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM)
+		return (ENOSYS);
+	__asm __volatile("isb" : : : "memory");
+	*tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get();
+	return (0);
+}
+
+#pragma weak __vdso_gettimekeep
+int
+__vdso_gettimekeep(struct vdso_timekeep **tk)
+{
+
+	return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
+}