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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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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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/* Note: linking in vDSO to a static binary requires changes to
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the main GLIBC proper. Not yet implemented. */
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#ifdef SHARED
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#include <dl-vdso.h>
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#include <bits/m68k-vdso.h>
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static inline void
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_libc_vdso_platform_setup (void)
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{
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void *p;
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PREPARE_VERSION (linux26, "LINUX_2.6", 61765110);
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/* It may happen that rtld didn't initialize the vDSO, so fallback
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to the syscall implementations if _dl_vdso_vsym returns NULL.
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This may happen when a static executable dlopen's a dynamic library.
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This really is nothing more than a workaround for rtld/csu
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deficiency. Ideally, init code would setup the vDSO for static
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binaries too. */
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p = _dl_vdso_vsym ("__kernel_read_tp", &linux26);
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if (p != NULL)
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{
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__vdso_read_tp = p;
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__rtld___vdso_read_tp = p;
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}
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else
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assert (__vdso_read_tp == (void *) __vdso_read_tp_stub);
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p = _dl_vdso_vsym ("__kernel_atomic_cmpxchg_32", &linux26);
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if (p != NULL)
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{
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__vdso_atomic_cmpxchg_32 = p;
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__rtld___vdso_atomic_cmpxchg_32 = p;
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}
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else
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assert (__vdso_atomic_cmpxchg_32
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== (void *) __vdso_atomic_cmpxchg_32_stub);
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p = _dl_vdso_vsym ("__kernel_atomic_barrier", &linux26);
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if (p != NULL)
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{
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__vdso_atomic_barrier = p;
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__rtld___vdso_atomic_barrier = p;
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}
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else
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assert (__vdso_atomic_barrier == (void *) __vdso_atomic_barrier_stub);
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}
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#define VDSO_SETUP _libc_vdso_platform_setup
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#endif /* SHARED */
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#include <sysdeps/unix/sysv/linux/init-first.c>
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