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linux: Consolidate Linux gettimeofday
The IFUNC bypass to vDSO is used when USE_IFUNC_GETTIMEOFDAY is set. Currently aarch64, powerpc*, and x86 defines it. Otherwise the generic implementation is used, which calls clock_gettime. Checked on aarch64-linux-gnu, 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
parent
7bcaf77574
commit
c701bcc6f4
@ -16,39 +16,5 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Get the current time of day and timezone information,
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putting it into *tv and *tz. If tz is null, *tz is not filled.
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Returns 0 on success, -1 on errors. */
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#include <time.h>
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#include <sysdep.h>
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#include <sysdep-vdso.h>
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/* Used as a fallback in the ifunc resolver if VDSO is not available
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and for libc.so internal __gettimeofday calls. */
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static int
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__gettimeofday_vsyscall (struct timeval *restrict tv, void *restrict tz)
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{
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if (__glibc_unlikely (tz != 0))
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memset (tz, 0, sizeof *tz);
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return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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}
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#ifdef SHARED
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# include <dl-vdso.h>
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# include <sysdep-vdso.h>
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# define INIT_ARCH()
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libc_ifunc (__gettimeofday,
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(get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL)
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?: __gettimeofday_vsyscall))
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#else
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int
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__gettimeofday (struct timeval *restrict tv, void *restrict tz)
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{
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return __gettimeofday_vsyscall (tv, tz);
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}
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#endif
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weak_alias (__gettimeofday, gettimeofday)
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#define USE_IFUNC_GETTIMEOFDAY
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#include <sysdeps/unix/sysv/linux/gettimeofday.c>
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57
sysdeps/unix/sysv/linux/gettimeofday.c
Normal file
57
sysdeps/unix/sysv/linux/gettimeofday.c
Normal file
@ -0,0 +1,57 @@
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/* gettimeofday - set time. Linux version.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Optimize the function call by setting the PLT directly to vDSO symbol. */
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#ifdef USE_IFUNC_GETTIMEOFDAY
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# include <time.h>
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# include <string.h>
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# include <sysdep.h>
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# include <sysdep-vdso.h>
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# ifdef SHARED
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# include <dl-vdso.h>
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static int
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__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
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{
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if (__glibc_unlikely (tz != 0))
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memset (tz, 0, sizeof *tz);
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return INLINE_SYSCALL_CALL (gettimeofday, tv, tz);
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}
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# undef INIT_ARCH
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# define INIT_ARCH() \
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void *vdso_gettimeofday = get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL)
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libc_ifunc (__gettimeofday,
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vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
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: (void *) __gettimeofday_syscall)
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# else
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int
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__gettimeofday (struct timeval *restrict tv, void *restrict tz)
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{
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if (__glibc_unlikely (tz != 0))
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memset (tz, 0, sizeof *tz);
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return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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}
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# endif
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weak_alias (__gettimeofday, gettimeofday)
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#else /* USE_IFUNC_GETTIMEOFDAY */
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# include <time/gettimeofday.c>
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#endif
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@ -15,36 +15,5 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <time.h>
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#include <sysdep.h>
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#include <sysdep-vdso.h>
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static int
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__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
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{
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if (__glibc_unlikely (tz != 0))
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memset (tz, 0, sizeof *tz);
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return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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}
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#ifdef SHARED
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# include <dl-vdso.h>
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# include <libc-vdso.h>
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# define INIT_ARCH() \
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void *vdso_gettimeofday = get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL)
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/* If the vDSO is not available we fall back syscall. */
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libc_ifunc (__gettimeofday,
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vdso_gettimeofday
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? VDSO_IFUNC_RET (vdso_gettimeofday)
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: (void *) __gettimeofday_syscall);
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#else
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int
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__gettimeofday (struct timeval *restrict tv, void *restrict tz)
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{
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return __gettimeofday_syscall (tv, tz);
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}
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#endif
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weak_alias (__gettimeofday, gettimeofday)
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#define USE_IFUNC_GETTIMEOFDAY
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#include <sysdeps/unix/sysv/linux/gettimeofday.c>
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@ -16,34 +16,5 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <time.h>
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#include <sysdep.h>
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#include <sysdep-vdso.h>
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static int
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__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
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{
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if (__glibc_unlikely (tz != 0))
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memset (tz, 0, sizeof *tz);
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return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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}
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#ifdef SHARED
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# include <dl-vdso.h>
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# include <libc-vdso.h>
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# define INIT_ARCH()
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/* If the vDSO is not available we fall back to syscall. */
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libc_ifunc (__gettimeofday,
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(get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL)
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?: __gettimeofday_syscall));
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#else
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int
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__gettimeofday (struct timeval *restrict tv, void *restrict tz)
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{
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return __gettimeofday_syscall (tv, tz);
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}
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#endif
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weak_alias (__gettimeofday, gettimeofday)
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#define USE_IFUNC_GETTIMEOFDAY
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#include <sysdeps/unix/sysv/linux/gettimeofday.c>
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