diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/gettimeofday.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/gettimeofday.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c index 48c3f84d86..97ea2a4a70 100644 --- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c +++ b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2005-2013 Free Software Foundation, Inc. +/* Copyright (C) 2005-2014 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 @@ -35,17 +35,36 @@ __gettimeofday_syscall (struct timeval *tv, struct timezone *tz) void * gettimeofday_ifunc (void) { + PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565); + /* If the vDSO is not available we fall back syscall. */ - return (__vdso_gettimeofday ? VDSO_IFUNC_RET (__vdso_gettimeofday) - : __gettimeofday_syscall); + void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615); + return (vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday) + : (void*)__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"); +asm (".globl __GI___gettimeofday"); + +/* __GI___gettimeofday is defined as hidden and for ppc32 it enables the + compiler make a local call (symbol@local) for internal GLIBC usage. It + means the PLT won't be used and the ifunc resolver will be called directly. + For ppc64 a call to a function in another translation unit might use a + different toc pointer thus disallowing direct branchess and making internal + ifuncs calls safe. */ +#ifdef __powerpc64__ +asm ("__GI___gettimeofday = __gettimeofday"); +#else +int +__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz) +{ + return INLINE_VSYSCALL (gettimeofday, 2, tv, tz); +} +asm ("__GI___gettimeofday = __gettimeofday_vsyscall"); +#endif #else |