From ca677d3c3cd0eba7d1f03092517aea553a0e8569 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Fri, 27 Jun 2014 14:00:18 -0700 Subject: Add x86 32 bit vDSO time function support Linux 3.15 adds support for clock_gettime, gettimeofday, and time vDSO (commit id 37c975545ec63320789962bf307f000f08fabd48). This patch adds GLIBC supports to use such symbol when they are avaiable. Along with x86 vDSO support, this patch cleanup x86_64 code by moving all common code to x86 common folder. Only init-first.c is different between implementations. --- sysdeps/unix/sysv/linux/x86/gettimeofday.c | 54 ++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/x86/gettimeofday.c (limited to 'sysdeps/unix/sysv/linux/x86/gettimeofday.c') diff --git a/sysdeps/unix/sysv/linux/x86/gettimeofday.c b/sysdeps/unix/sysv/linux/x86/gettimeofday.c new file mode 100644 index 0000000000..c820fd767b --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86/gettimeofday.c @@ -0,0 +1,54 @@ +/* gettimeofday - get the time. Linux/x86 version. + Copyright (C) 2015 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 + . */ + +#include + +#ifdef SHARED + +# include + +void *gettimeofday_ifunc (void) __asm__ ("__gettimeofday"); + +void * +gettimeofday_ifunc (void) +{ + PREPARE_VERSION_KNOWN (linux26, LINUX_2_6); + + /* If the vDSO is not available we fall back on the old vsyscall. */ + return (_dl_vdso_vsym ("__vdso_gettimeofday", &linux26) + ?: GETTIMEOFAY_FALLBACK); +} +asm (".type __gettimeofday, %gnu_indirect_function"); + +libc_ifunc_hidden_def(__gettimeofday) + +#else + +# include +# include + +int +__gettimeofday (struct timeval *tv, struct timezone *tz) +{ + return INLINE_SYSCALL (gettimeofday, 2, tv, tz); +} +libc_hidden_def (__gettimeofday) + +#endif +weak_alias (__gettimeofday, gettimeofday) +libc_hidden_weak (gettimeofday) -- cgit 1.4.1