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56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux/x86-64.
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Copyright (C) 2007-2015 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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#ifdef SHARED
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# include <time.h>
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# include <sysdep.h>
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# include <dl-vdso.h>
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# include <libc-vdso.h>
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long int (*__vdso_clock_gettime) (clockid_t, struct timespec *)
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attribute_hidden;
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long int (*__vdso_getcpu) (unsigned *, unsigned *, void *) attribute_hidden;
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extern long int __syscall_clock_gettime (clockid_t, struct timespec *);
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static inline void
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__vdso_platform_setup (void)
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{
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PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
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void *p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux26);
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if (p == NULL)
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p = __syscall_clock_gettime;
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PTR_MANGLE (p);
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__vdso_clock_gettime = p;
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p = _dl_vdso_vsym ("__vdso_getcpu", &linux26);
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/* If the vDSO is not available we fall back on the old vsyscall. */
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#define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800
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if (p == NULL)
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p = (void *) VSYSCALL_ADDR_vgetcpu;
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PTR_MANGLE (p);
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__vdso_getcpu = p;
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}
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# define VDSO_SETUP __vdso_platform_setup
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#endif
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#include <csu/init-first.c>
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