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authorUlrich Drepper <drepper@redhat.com>2007-08-13 18:47:42 +0000
committerUlrich Drepper <drepper@redhat.com>2007-08-13 18:47:42 +0000
commit9c6f6953fda96b49c8510a879304ea4222ea1781 (patch)
treec169827926668d35139d9d1bbe26db86c17f8e6d /sysdeps
parentf8de5057b9ded1d4ff41d8614530a83ba338c9e8 (diff)
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* 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.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/gettimeofday.S7
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/libc-start.c4
2 files changed, 10 insertions, 1 deletions
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;