1 /*-
2 * Copyright (c) 2021 Jessica Clarke
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/types.h>
27 #include <sys/elf.h>
28 #include <sys/time.h>
29 #include <sys/vdso.h>
30
31 #include <machine/riscvreg.h>
32
33 #include <errno.h>
34
35 #include "libc_private.h"
36
37 #pragma weak __vdso_gettc
38 int
__vdso_gettc(const struct vdso_timehands * th,u_int * tc)39 __vdso_gettc(const struct vdso_timehands *th, u_int *tc)
40 {
41 if (th->th_algo != VDSO_TH_ALGO_RISCV_RDTIME)
42 return (ENOSYS);
43
44 *tc = csr_read(time);
45 return (0);
46 }
47
48 #pragma weak __vdso_gettimekeep
49 int
__vdso_gettimekeep(struct vdso_timekeep ** tk)50 __vdso_gettimekeep(struct vdso_timekeep **tk)
51 {
52 return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
53 }
54