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linux: Consolidate time implementation

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The IFUNC bypass to vDSO is used when USE_IFUNC_TIME is set.
Currently powerpc and x86 defines it.  Otherwise the generic
implementation is used, which calls clock_gettime.

Checked on powerpc64le-linux-gnu, powerpc64-linux-gnu,
powerpc-linux-gnu-power4, x86_64-linux-gnu, and i686-linux-gnu.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Adhemerval Zanella 2019-12-16 09:58:32 -03:00
parent c701bcc6f4
commit e760874ee3
3 changed files with 54 additions and 55 deletions
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32
sysdeps/unix/sysv/linux/powerpc/time.c
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@ -16,33 +16,5 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <time.h>
#include <sysdep.h>
#include <sysdep-vdso.h>
static time_t
time_vsyscall (time_t *t)
{
return INLINE_VSYSCALL (time, 1, t);
}
#ifdef SHARED
# include <dl-vdso.h>
# include <libc-vdso.h>
# define INIT_ARCH() \
void *vdso_time = get_vdso_symbol (HAVE_TIME_VSYSCALL);
/* If the vDSO is not available we fall back to the syscall. */
libc_ifunc (time,
vdso_time
? VDSO_IFUNC_RET (vdso_time)
: (void *) time_vsyscall);
#else
time_t
time (time_t *t)
{
return time_vsyscall (t);
}
#endif /* !SHARED */
#define USE_IFUNC_TIME
#include <sysdeps/unix/sysv/linux/time.c>

50
sysdeps/unix/sysv/linux/time.c Normal file
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@ -0,0 +1,50 @@
/* time -- Get number of seconds since Epoch. Linux version.
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Optimize the function call by setting the PLT directly to vDSO symbol. */
#ifdef USE_IFUNC_TIME
# include <time.h>
# include <sysdep.h>
# include <sysdep-vdso.h>
#ifdef SHARED
# include <dl-vdso.h>
static time_t
time_syscall (time_t *t)
{
return INLINE_SYSCALL_CALL (time, t);
}
# undef INIT_ARCH
# define INIT_ARCH() \
void *vdso_time = get_vdso_symbol (HAVE_TIME_VSYSCALL);
libc_ifunc (time,
vdso_time ? VDSO_IFUNC_RET (vdso_time)
: (void *) time_syscall);
# else
time_t
time (time_t *t)
{
return INLINE_VSYSCALL (time, 1, t);
}
# endif /* !SHARED */
#else /* USE_IFUNC_TIME */
# include <time/time.c>
#endif

27
sysdeps/unix/sysv/linux/x86/time.c
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@ -16,28 +16,5 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <time.h>
#include <sysdep.h>
#include <sysdep-vdso.h>
static time_t
time_vsyscall (time_t *t)
{
return INLINE_VSYSCALL (time, 1, t);
}
#ifdef SHARED
# include <dl-vdso.h>
# include <libc-vdso.h>
#undef INIT_ARCH
#define INIT_ARCH()
/* If the vDSO is not available we fall back on the syscall. */
libc_ifunc (time, (get_vdso_symbol ("__vdso_time") ?: time_vsyscall))
#else
time_t
time (time_t *t)
{
return time_vsyscall (t);
}
#endif
#define USE_IFUNC_TIME
#include <sysdeps/unix/sysv/linux/time.c>