diff -ur eglibc-2.11.2//sysdeps/x86_64/dl-trampoline.S eglibc-2.11.2.changed//sysdeps/x86_64/dl-trampoline.S
--- eglibc-2.11.2//sysdeps/x86_64/dl-trampoline.S	2009-08-26 05:17:41.000000000 +0300
+++ eglibc-2.11.2.changed//sysdeps/x86_64/dl-trampoline.S	2011-10-25 01:10:36.153062354 +0300
@@ -139,16 +139,26 @@
 	movl	$1, %eax
 	cpuid
 	movq	%r11,%rbx		# Restore rbx
-	movl	$1, %eax
-	testl	$(1 << 28), %ecx
+	xorl	%eax, %eax
+	// AVX and XSAVE supported?
+	andl	$((1 << 28) | (1 << 27)), %ecx
+	cmpl	$((1 << 28) | (1 << 27)), %ecx
 	jne	2f
-	negl	%eax
-2:	movl	%eax, L(have_avx)(%rip)
+	xorl	%ecx, %ecx
+	// Get XFEATURE_ENABLED_MASK
+	xgetbv
+	andl	$0x6, %eax
+	cmpl	$0x6, %eax
+	// Nonzero if SSE and AVX state saving is enabled.
+	sete	%al
+2:	leal	-1(%eax,%eax), %eax
+	movl	%eax, L(have_avx)(%rip)
 	cmpl	$0, %eax
 
 1:	js	L(no_avx)
 
 #  define RESTORE_AVX
+#  define MORE_CODE
 #  include "dl-trampoline.h"
 
 	.align 16
@@ -176,11 +186,20 @@
 	movl	$1, %eax
 	cpuid
 	movq	%r11,%rbx		# Restore rbx
-	movl	$1, %eax
-	testl	$(1 << 28), %ecx
+	xorl	%eax, %eax
+	// AVX and XSAVE supported?
+	andl	$((1 << 28) | (1 << 27)), %ecx
+	cmpl	$((1 << 28) | (1 << 27)), %ecx
 	jne	2f
-	negl	%eax
-2:	movl	%eax, L(have_avx)(%rip)
+	xorl	%ecx, %ecx
+	// Get XFEATURE_ENABLED_MASK
+	xgetbv
+	andl	$0x6, %eax
+	cmpl	$0x6, %eax
+	// Nonzero if SSE and AVX state saving is enabled.
+	sete	%al
+2:	leal	-1(%eax,%eax), %eax
+	movl	%eax, L(have_avx)(%rip)
 	cmpl	$0, %eax
 
 1:	js	L(no_avx5)
diff -ur eglibc-2.11.2//sysdeps/x86_64/dl-trampoline.h eglibc-2.11.2.changed//sysdeps/x86_64/dl-trampoline.h
--- eglibc-2.11.2//sysdeps/x86_64/dl-trampoline.h	2009-08-09 17:33:15.000000000 +0300
+++ eglibc-2.11.2.changed//sysdeps/x86_64/dl-trampoline.h	2011-10-25 01:15:09.501060129 +0300
@@ -267,3 +267,10 @@
 				# (eats the reloc index and link_map)
 	cfi_adjust_cfa_offset(-48)
 	retq
+
+#ifdef MORE_CODE
+	cfi_adjust_cfa_offset(48)
+	cfi_rel_offset(%rbx, 0)
+	cfi_def_cfa_register(%rbx)
+# undef MORE_CODE
+#endif