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83e7640f6b
PowerPC kernel now provides a vDSO implementation for time syscall (commit fcb41a2030abe0eb716ef0798035ef9562097f42). This patch changes time syscall wrapper to use the vDSO when available. It also changes the default non vDSO time on PowerPC to use sysdeps/posix/time.c (since gettimeofday is a vDSO call).
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* Resolve function pointers to VDSO functions.
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Copyright (C) 2005-2013 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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#ifndef _LIBC_VDSO_H
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#define _LIBC_VDSO_H
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#ifdef SHARED
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extern void *__vdso_gettimeofday attribute_hidden;
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extern void *__vdso_clock_gettime;
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extern void *__vdso_clock_getres;
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extern void *__vdso_get_tbfreq;
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extern void *__vdso_getcpu;
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extern void *__vdso_time;
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/* This macro is needed for PPC64 to return a skeleton OPD entry of a vDSO
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symbol. This works because _dl_vdso_vsym always return the function
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address, and no vDSO symbols use the TOC or chain pointers from the OPD
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so we can allow them to be garbage. */
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#if defined(__PPC64__) || defined(__powerpc64__)
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#define VDSO_IFUNC_RET(value) ((void *) &(value))
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#else
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#define VDSO_IFUNC_RET(value) ((void *) (value))
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#endif
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#endif
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#endif /* _LIBC_VDSO_H */
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