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From 3f38cbfa2a44bf510122d3fcb0f0504a208dbf5e Mon Sep 17 00:00:00 2001
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From: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
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Date: Fri, 15 Mar 2013 10:58:56 -0300
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Subject: [PATCH 19/42] PowerPC: gettimeofday optimization by using IFUNC
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(backported from commit
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ef26eece6331a1f6d959818e37c438cc7ce68e53)
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---
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sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h | 10 +++++
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sysdeps/unix/sysv/linux/powerpc/gettimeofday.c | 48 +++++++++++++++++-------
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3 files changed, 52 insertions(+), 13 deletions(-)
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
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index cda8491..e4ae630 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
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@@ -32,6 +32,16 @@ extern void *__vdso_get_tbfreq;
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extern void *__vdso_getcpu;
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+/* This macro is needed for PPC64 to return a skeleton OPD entry of a vDSO
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+ symbol. This works because _dl_vdso_vsym always return the function
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+ address, and no vDSO symbols use the TOC or chain pointers from the OPD
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+ so we can allow them to be garbage. */
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+#if defined(__PPC64__) || defined(__powerpc64__)
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+#define VDSO_IFUNC_RET(value) &value
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+#else
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+#define VDSO_IFUNC_RET(value) value
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+#endif
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+
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#endif
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#endif /* _LIBC_VDSO_H */
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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index 7376135..4f4abbd 100644
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
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@@ -15,26 +15,48 @@
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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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-#include <sysdep.h>
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-#include <bp-checks.h>
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-#include <stddef.h>
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#include <sys/time.h>
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-#include <time.h>
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-#include <hp-timing.h>
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-#include <bits/libc-vdso.h>
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+#ifdef SHARED
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-/* Get the current time of day and timezone information,
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- putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled.
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- Returns 0 on success, -1 on errors. */
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+# include <dl-vdso.h>
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+# include <bits/libc-vdso.h>
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+
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+void *gettimeofday_ifunc (void) __asm__ ("__gettimeofday");
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+
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+static int
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+__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
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+{
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+ return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
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+}
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+
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+void *
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+gettimeofday_ifunc (void)
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+{
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+ /* If the vDSO is not available we fall back syscall. */
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+ return (__vdso_gettimeofday ? VDSO_IFUNC_RET (__vdso_gettimeofday)
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+ : __gettimeofday_syscall);
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+}
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+asm (".type __gettimeofday, %gnu_indirect_function");
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+
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+/* This is doing "libc_hidden_def (__gettimeofday)" but the compiler won't
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+ let us do it in C because it doesn't know we're defining __gettimeofday
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+ here in this file. */
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+asm (".globl __GI___gettimeofday\n"
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+ "__GI___gettimeofday = __gettimeofday");
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+
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+#else
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+
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+# include <sysdep.h>
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+# include <errno.h>
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int
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-__gettimeofday (tv, tz)
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- struct timeval *tv;
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- struct timezone *tz;
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+__gettimeofday (struct timeval *tv, struct timezone *tz)
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{
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- return INLINE_VSYSCALL (gettimeofday, 2, CHECK_1 (tv), CHECK_1 (tz));
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+ return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
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}
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libc_hidden_def (__gettimeofday)
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+
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+#endif
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weak_alias (__gettimeofday, gettimeofday)
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libc_hidden_weak (gettimeofday)
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--
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1.7.11.7
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