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glibc/sysdeps/unix/sysv/linux/s390/init-first.c
Adhemerval Zanella 5e855c8954 s390: Enable VDSO for static linking
Although s390 only enables vDSO for dynamically linked elf binaries
(arch/s390/kernel/vdso.c:217), there is no indication in the code or
associated commit message for why not enable it for statically linked
binaries as well.  To double check, I rebuilt a kernel with the
check removed and the vDSO does work for static build for supplied
symbols.

Checked on s390x-linux-gnu and s390-linux-gnu.

	[BZ #19767]
	* sysdeps/unix/sysv/linux/s390/init-first.c: Remove #ifdef SHARED.
	* sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	(ALWAYS_USE_VSYSCALL): Define.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	(ALWAYS_USE_VSYSCALL): Likewise.
2019-08-05 16:38:22 -03:00

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1.8 KiB
C

/* Initialization code run first thing by the ELF startup code. Linux/s390.
Copyright (C) 2008-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <dl-vdso.h>
#include <libc-vdso.h>
long int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
attribute_hidden;
long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
__attribute__ ((nocommon));
long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
__attribute__ ((nocommon));
long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
attribute_hidden;
static inline void
_libc_vdso_platform_setup (void)
{
PREPARE_VERSION_KNOWN (linux2629, LINUX_2_6_29);
void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2629);
PTR_MANGLE (p);
VDSO_SYMBOL (gettimeofday) = p;
p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2629);
PTR_MANGLE (p);
VDSO_SYMBOL (clock_gettime) = p;
p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2629);
PTR_MANGLE (p);
VDSO_SYMBOL (clock_getres) = p;
p = _dl_vdso_vsym ("__kernel_getcpu", &linux2629);
PTR_MANGLE (p);
VDSO_SYMBOL (getcpu) = p;
}
#include <csu/init-first.c>