1/*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/types.h> 33#include <sys/elf.h> 34#include <sys/time.h> 35#include <sys/vdso.h> 36#include <machine/cpufunc.h> 37#include <machine/acle-compat.h> 38#include <errno.h> 39#include "libc_private.h" 40 41#if __ARM_ARCH >= 6 42static inline uint64_t 43cp15_cntvct_get(void) 44{ 45 uint64_t reg; 46 47 __asm __volatile("mrrc\tp15, 1, %Q0, %R0, c14" : "=r" (reg)); 48 return (reg); 49} 50 51static inline uint64_t 52cp15_cntpct_get(void) 53{ 54 uint64_t reg; 55 56 __asm __volatile("mrrc\tp15, 0, %Q0, %R0, c14" : "=r" (reg)); 57 return (reg); 58} 59#endif 60 61#pragma weak __vdso_gettc 62int 63__vdso_gettc(const struct vdso_timehands *th, u_int *tc) 64{ 65 66 if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM) 67 return (ENOSYS); 68#if __ARM_ARCH >= 6 69 /* 70 * Userspace gettimeofday() is only enabled on ARMv7 CPUs, but 71 * libc is compiled for ARMv6. Due to clang issues, .arch 72 * armv7-a directive does not work. 73 */ 74 __asm __volatile(".word\t0xf57ff06f" : : : "memory"); /* isb */ 75 *tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get(); 76 return (0); 77#else 78 *tc = 0; 79 return (ENOSYS); 80#endif 81} 82 83#pragma weak __vdso_gettimekeep 84int 85__vdso_gettimekeep(struct vdso_timekeep **tk) 86{ 87 88 return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk))); 89} 90