arch/x86/entry/vdso/vclock_gettime.c

   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
  17 extern int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
  18 extern __kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
  19
  20 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
  21 {
  22         return __cvdso_gettimeofday(tv, tz);
  23 }
  24
  25 int 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(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 */
  38 extern int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
  39 extern int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res);
  40
  41 int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
  42 {
  43         return __cvdso_clock_gettime(clock, ts);
  44 }
  45
  46 int clock_gettime(clockid_t, struct __kernel_timespec *)
  47         __attribute__((weak, alias("__vdso_clock_gettime")));
  48
  49 int __vdso_clock_getres(clockid_t clock,
  50                         struct __kernel_timespec *res)
  51 {
  52         return __cvdso_clock_getres(clock, res);
  53 }
  54 int clock_getres(clockid_t, struct __kernel_timespec *)
  55         __attribute__((weak, alias("__vdso_clock_getres")));
  56
  57 #else
  58 /* i386 only */
  59 extern int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts);
  60 extern int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res);
  61
  62 int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
  63 {
  64         return __cvdso_clock_gettime32(clock, ts);
  65 }
  66
  67 int clock_gettime(clockid_t, struct old_timespec32 *)
  68         __attribute__((weak, alias("__vdso_clock_gettime")));
  69
  70 int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
  71 {
  72         return __cvdso_clock_gettime(clock, ts);
  73 }
  74
  75 int clock_gettime64(clockid_t, struct __kernel_timespec *)
  76         __attribute__((weak, alias("__vdso_clock_gettime64")));
  77
  78 int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res)
  79 {
  80         return __cvdso_clock_getres_time32(clock, res);
  81 }
  82
  83 int clock_getres(clockid_t, struct old_timespec32 *)
  84         __attribute__((weak, alias("__vdso_clock_getres")));
  85 #endif