From 9c6f6953fda96b49c8510a879304ea4222ea1781 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Mon, 13 Aug 2007 18:47:42 +0000 Subject: * sysdeps/unix/sysv/linux/x86_64/libc-start.c (_libc_vdso_platform_setup): If vDSO is not available point __vdso_gettimeofday to the vsyscall. * sysdeps/unix/sysv/linux/x86_64/gettimeofday.S [SHARED]: Use __vdso_gettimeofday instead of vsyscall. --- sysdeps/unix/sysv/linux/x86_64/gettimeofday.S | 7 ++++++- sysdeps/unix/sysv/linux/x86_64/libc-start.c | 4 ++++ 2 files changed, 10 insertions(+), 1 deletion(-) (limited to 'sysdeps') diff --git a/sysdeps/unix/sysv/linux/x86_64/gettimeofday.S b/sysdeps/unix/sysv/linux/x86_64/gettimeofday.S index 84a99b0406..f618e738b1 100644 --- a/sysdeps/unix/sysv/linux/x86_64/gettimeofday.S +++ b/sysdeps/unix/sysv/linux/x86_64/gettimeofday.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2007 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 @@ -28,7 +28,12 @@ ENTRY (__gettimeofday) /* Align stack. */ sub $0x8, %rsp cfi_adjust_cfa_offset(8) +#ifdef SHARED + movq __vdso_gettimeofday(%rip), %rax + PTR_DEMANGLE (%rax) +#else movq $VSYSCALL_ADDR_vgettimeofday, %rax +#endif callq *%rax /* Check error return. */ cmpl $-4095, %eax diff --git a/sysdeps/unix/sysv/linux/x86_64/libc-start.c b/sysdeps/unix/sysv/linux/x86_64/libc-start.c index 0ce47952d7..dea2e8afe4 100644 --- a/sysdeps/unix/sysv/linux/x86_64/libc-start.c +++ b/sysdeps/unix/sysv/linux/x86_64/libc-start.c @@ -31,6 +31,10 @@ _libc_vdso_platform_setup (void) PREPARE_VERSION (linux26, "LINUX_2.6", 61765110); void *p = _dl_vdso_vsym ("gettimeofday", &linux26); + /* If the vDSO is not available we fall back on the old vsyscall. */ +#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000ul + if (p == NULL) + p = (void *) VSYSCALL_ADDR_vgettimeofday; PTR_MANGLE (p); __vdso_gettimeofday = p; -- cgit 1.4.1