1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020 Brandon Bergren <bdragon@FreeBSD.org> 5 * 6 * This software was developed by Konstantin Belousov 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/elf.h> 33 #include <sys/time.h> 34 #include <sys/vdso.h> 35 36 #include <machine/cpufunc.h> 37 38 #include <errno.h> 39 40 #include "libc_private.h" 41 42 #pragma weak __vdso_gettc 43 int 44 __vdso_gettc(const struct vdso_timehands *th, u_int *tc) 45 { 46 u_quad_t tb; 47 48 if (__predict_false(th->th_algo != VDSO_TH_ALGO_PPC_TB)) 49 return (ENOSYS); 50 51 __asm __volatile ("mftb %0" : "=r"(tb)); 52 *tc = tb; 53 return (0); 54 } 55 56 #pragma weak __vdso_gettimekeep 57 int 58 __vdso_gettimekeep(struct vdso_timekeep **tk) 59 { 60 61 return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk))); 62 } 63