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f534255e4d
This patch consolidate the Linux vDSO define and usage across all ports
that uses it. The common vDSO definitions and calling through
{INLINE/INTERNAL}_VSYSCALL macros are moved to a common header
sysdep-vdso.h and vDSO name declaration and prototype is defined
using a common macro.
Also PTR_{MANGLE,DEMANGLE} is added to ports that does not use them
for vDSO calls (aarch64, powerpc, s390, and tile) and thus it will
reflect in code changes. For ports that already implement pointer
mangling/demangling in vDSO system (i386, x32, x86_64) this patch
is mainly a code refactor.
Checked on x32, x86_64, x32, ppc64le, and aarch64.
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux/i386.
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Copyright (C) 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 <sysdep-vdso.h>
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long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
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attribute_hidden;
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static long int
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clock_gettime_syscall (clockid_t id, struct timespec *tp)
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{
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INTERNAL_SYSCALL_DECL (err);
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return INTERNAL_SYSCALL (clock_gettime, err, 2, id, tp);
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}
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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_KNOWN (linux26, LINUX_2_6);
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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 = clock_gettime_syscall;
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PTR_MANGLE (p);
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VDSO_SYMBOL (clock_gettime) = 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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