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a4d7fe35cd
This patch uses the libc_ifunc_hidden macro to create already existing ifunc functions time and gettimeofday on power. This way, the libc_hidden_def macro can be used instead of inline assemblies. On ppc32, the __GI_* symbols do not target the ifunc symbol and thus the redirection construct has to be applied here. ChangeLog: * sysdeps/unix/sysv/linux/powerpc/gettimeofday.c (__gettimeofday): Use libc_ifunc_hidden and libc_hidden_def macro. Redirect ifunced function in header for using it as type for ifunc function because __GI_* symbols for ppc32 do not target the ifunc symbols. * sysdeps/unix/sysv/linux/powerpc/time.c (time): Likewise.
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Copyright (C) 2005-2016 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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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<http://www.gnu.org/licenses/>. */
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#if defined SHARED && !defined __powerpc64__
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# define __gettimeofday __redirect___gettimeofday
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#else
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# define __redirect___gettimeofday __gettimeofday
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#endif
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#include <sys/time.h>
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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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# include <dl-machine.h>
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# ifndef __powerpc64__
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# undef __gettimeofday
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int
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__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
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{
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return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
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}
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/* __GI___gettimeofday is defined as hidden and for ppc32 it enables the
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compiler make a local call (symbol@local) for internal GLIBC usage. It
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means the PLT won't be used and the ifunc resolver will be called directly.
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For ppc64 a call to a function in another translation unit might use a
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different toc pointer thus disallowing direct branchess and making internal
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ifuncs calls safe. */
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# undef libc_hidden_def
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# define libc_hidden_def(name) \
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__hidden_ver1 (__gettimeofday_vsyscall, __GI___gettimeofday, \
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__gettimeofday_vsyscall);
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# endif /* !__powerpc64__ */
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static int
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__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
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{
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return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
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}
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# define INIT_ARCH() \
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PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565); \
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void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
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/* If the vDSO is not available we fall back syscall. */
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libc_ifunc_hidden (__redirect___gettimeofday, __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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libc_hidden_def (__gettimeofday)
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#else
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# include <sysdep.h>
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# include <errno.h>
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int
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__gettimeofday (struct timeval *tv, struct timezone *tz)
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{
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return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
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}
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libc_hidden_def (__gettimeofday)
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#endif
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weak_alias (__gettimeofday, gettimeofday)
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libc_hidden_weak (gettimeofday)
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