1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Fast user context implementation of clock_gettime, gettimeofday, and time.
4 *
5 * Copyright 2006 Andi Kleen, SUSE Labs.
6 * Copyright 2019 ARM Limited
7 *
8 * 32 Bit compat layer by Stefani Seibold <stefani@seibold.net>
9 * sponsored by Rohde & Schwarz GmbH & Co. KG Munich/Germany
10 */
11#include <linux/time.h>
12#include <linux/kernel.h>
13#include <linux/types.h>
14
15#include "../../../../lib/vdso/gettimeofday.c"
16
17extern int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
18extern __kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
19
20int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
21{
22 return __cvdso_gettimeofday(tv, tz);
23}
24
25int gettimeofday(struct __kernel_old_timeval *, struct timezone *)
26 __attribute__((weak, alias("__vdso_gettimeofday")));
27
28__kernel_old_time_t __vdso_time(__kernel_old_time_t *t)
29{
30 return __cvdso_time(time: t);
31}
32
33__kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time")));
34
35
36#if defined(CONFIG_X86_64) && !defined(BUILD_VDSO32_64)
37/* both 64-bit and x32 use these */
38extern int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
39extern int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res);
40
41int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
42{
43 return __cvdso_clock_gettime(clock, ts);
44}
45
46int clock_gettime(clockid_t, struct __kernel_timespec *)
47 __attribute__((weak, alias("__vdso_clock_gettime")));
48
49int __vdso_clock_getres(clockid_t clock,
50 struct __kernel_timespec *res)
51{
52 return __cvdso_clock_getres(clock, res);
53}
54int clock_getres(clockid_t, struct __kernel_timespec *)
55 __attribute__((weak, alias("__vdso_clock_getres")));
56
57#else
58/* i386 only */
59extern int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts);
60extern int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res);
61
62int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
63{
64 return __cvdso_clock_gettime32(clock, ts);
65}
66
67int clock_gettime(clockid_t, struct old_timespec32 *)
68 __attribute__((weak, alias("__vdso_clock_gettime")));
69
70int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
71{
72 return __cvdso_clock_gettime(clock, ts);
73}
74
75int clock_gettime64(clockid_t, struct __kernel_timespec *)
76 __attribute__((weak, alias("__vdso_clock_gettime64")));
77
78int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res)
79{
80 return __cvdso_clock_getres_time32(clock, res);
81}
82
83int clock_getres(clockid_t, struct old_timespec32 *)
84 __attribute__((weak, alias("__vdso_clock_getres")));
85#endif
86

source code of linux/arch/x86/entry/vdso/vclock_gettime.c