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PowerPC: gettimeofday optimization by using IFUNC

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This commit is contained in:
Adhemerval Zanella 2013-03-15 10:58:56 -03:00
parent 8cfdb7e056
commit ef26eece63
4 changed files with 53 additions and 54 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2013-03-15 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h (VDSO_IFUNC_RET): Add
macro to return vdso values correctly in IFUNC implementations.
* sysdeps/unix/sysv/linux/powerpc/gettimeofday.c (__gettimeofday):
Optimization by using IFUNC.
2013-03-15 Siddhesh Poyarekar <siddhesh@redhat.com>
Richard Henderson <rth@redhat.com>
Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>

42
sysdeps/gnu/configure vendored
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@ -1,42 +0,0 @@
# This file is generated from configure.in by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/gnu.
# The Filesystem Hierarchy Standard prescribes where to place "essential"
# files. I.e., when the installation prefix is "/usr" we have to place
# shared library objects and the configuration files on the root partition
# in /lib and /etc.
case "$prefix" in
/usr | /usr/)
# 64-bit libraries on bi-arch platforms go in /lib64 instead of /lib.
# Allow earlier configure scripts to handle libc_cv_slibdir, libdir,
# and libc_cv_localedir.
test -n "$libc_cv_slibdir" || \
case $machine in
sparc/sparc64 | x86_64* | powerpc/powerpc64 | s390/s390-64)
libc_cv_slibdir=/lib64
if test "$libdir" = '${exec_prefix}/lib'; then
libdir='${exec_prefix}/lib64';
# Locale data can be shared between 32bit and 64bit libraries
libc_cv_localedir='${exec_prefix}/lib/locale'
fi
;;
*)
libc_cv_slibdir=/lib
;;
esac
# Allow the user to override the path with --sysconfdir.
if test "$sysconfdir" = '${prefix}/etc'; then
libc_cv_sysconfdir=/etc
else
libc_cv_sysconfdir=$sysconfdir
fi
# Allow the user to override the path with --localstatedir.
if test "$localstatedir" = '${prefix}/var'; then
libc_cv_localstatedir=/var
else
libc_cv_localstatedir=$localstatedir
fi
libc_cv_rootsbindir=/sbin
;;
esac

10
sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
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@ -32,6 +32,16 @@ extern void *__vdso_get_tbfreq;
extern void *__vdso_getcpu;
/* This macro is needed for PPC64 to return a skeleton OPD entry of a vDSO
symbol. This works because _dl_vdso_vsym always return the function
address, and no vDSO symbols use the TOC or chain pointers from the OPD
so we can allow them to be garbage. */
#if defined(__PPC64__) || defined(__powerpc64__)
#define VDSO_IFUNC_RET(value) &value
#else
#define VDSO_IFUNC_RET(value) value
#endif
#endif
#endif /* _LIBC_VDSO_H */

48
sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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@ -15,25 +15,49 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <stddef.h>
#include <sys/time.h>
#include <time.h>
#include <hp-timing.h>
#include <bits/libc-vdso.h>
#ifdef SHARED
/* Get the current time of day and timezone information,
putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled.
Returns 0 on success, -1 on errors. */
# include <dl-vdso.h>
# include <bits/libc-vdso.h>
void *gettimeofday_ifunc (void) __asm__ ("__gettimeofday");
static int
__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
{
return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
}
void *
gettimeofday_ifunc (void)
{
/* If the vDSO is not available we fall back syscall. */
return (__vdso_gettimeofday ? VDSO_IFUNC_RET (__vdso_gettimeofday)
: __gettimeofday_syscall);
}
asm (".type __gettimeofday, %gnu_indirect_function");
/* This is doing "libc_hidden_def (__gettimeofday)" but the compiler won't
let us do it in C because it doesn't know we're defining __gettimeofday
here in this file. */
asm (".globl __GI___gettimeofday\n"
"__GI___gettimeofday = __gettimeofday");
#else
# include <sysdep.h>
# include <errno.h>
int
__gettimeofday (tv, tz)
struct timeval *tv;
struct timezone *tz;
__gettimeofday (struct timeval *tv, struct timezone *tz)
{
return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
}
libc_hidden_def (__gettimeofday)
#endif
weak_alias (__gettimeofday, gettimeofday)
libc_hidden_weak (gettimeofday)