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/i386/gettimeofday.c | 39 ++++++++++++++++++++++ sysdeps/unix/sysv/linux/i386/init-first.c | 52 +++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/i386/time.c | 37 ++++++++++++++++++++ 3 files changed, 128 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/i386/gettimeofday.c create mode 100644 sysdeps/unix/sysv/linux/i386/init-first.c create mode 100644 sysdeps/unix/sysv/linux/i386/time.c (limited to 'sysdeps/unix/sysv/linux/i386') diff --git a/sysdeps/unix/sysv/linux/i386/gettimeofday.c b/sysdeps/unix/sysv/linux/i386/gettimeofday.c new file mode 100644 index 0000000000..3e00eb46aa --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/gettimeofday.c @@ -0,0 +1,39 @@ +/* gettimeofday - get the time. Linux/i386 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 +# include + +/* If the vDSO is not available we fall back on the syscall. */ +static int +__gettimeofday_syscall (struct timeval *tv, struct timezone *tz) +{ + return INLINE_SYSCALL (gettimeofday, 2, tv, tz); +} +# define GETTIMEOFAY_FALLBACK (void*) (&__gettimeofday_syscall) +# undef libc_ifunc_hidden_def +# define libc_ifunc_hidden_def(name) \ + libc_ifunc_hidden_def1 (__GI_##name, __gettimeofday_syscall) + +#endif + +#include diff --git a/sysdeps/unix/sysv/linux/i386/init-first.c b/sysdeps/unix/sysv/linux/i386/init-first.c new file mode 100644 index 0000000000..4be65d7e47 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/init-first.c @@ -0,0 +1,52 @@ +/* Initialization code run first thing by the ELF startup code. Linux/i386. + 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 + . */ + +#ifdef SHARED +# include +# include +# include +# include + +long int (*__vdso_clock_gettime) (clockid_t, struct timespec *) + __attribute__ ((nocommon)); +libc_hidden_proto (__vdso_clock_gettime) +libc_hidden_data_def (__vdso_clock_gettime) + +static long int +clock_gettime_syscall (clockid_t id, struct timespec *tp) +{ + INTERNAL_SYSCALL_DECL (err); + return INTERNAL_SYSCALL (clock_gettime, err, 2, id, tp); +} + +static inline void +__vdso_platform_setup (void) +{ + PREPARE_VERSION_KNOWN (linux26, LINUX_2_6); + + void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26); + if (p == NULL) + p = clock_gettime_syscall; + PTR_MANGLE (p); + __vdso_clock_gettime = p; +} + +# define VDSO_SETUP __vdso_platform_setup +#endif + +#include diff --git a/sysdeps/unix/sysv/linux/i386/time.c b/sysdeps/unix/sysv/linux/i386/time.c new file mode 100644 index 0000000000..e8a4e593e1 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/time.c @@ -0,0 +1,37 @@ +/* time -- Get number of seconds since Epoch. Linux/i386 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 + . */ + +#ifdef SHARED + +# include +# include + +/* If the vDSO is not available we fall back on the old vsyscall. */ +static time_t +__time_syscall (time_t *t) +{ + INTERNAL_SYSCALL_DECL (err); + return INTERNAL_SYSCALL (time, err, 1, t); +} +# define TIME_FALLBACK (void*) &__time_syscall +# undef libc_ifunc_hidden_def +# define libc_ifunc_hidden_def(name) \ + libc_ifunc_hidden_def1 (__GI_##name, __time_syscall) +#endif + +#include -- cgit 1.4.1