--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os_cpu/linux_x86/vm/assembler_linux_x86_64.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_assembler_linux_x86_64.cpp.incl"
+
+void MacroAssembler::int3() {
+  call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
+}
+
+void MacroAssembler::get_thread(Register thread) {
+  // call pthread_getspecific
+  // void * pthread_getspecific(pthread_key_t key);
+   if (thread != rax) {
+     pushq(rax);
+   }
+   pushq(rdi);
+   pushq(rsi);
+   pushq(rdx);
+   pushq(rcx);
+   pushq(r8);
+   pushq(r9);
+   pushq(r10);
+   // XXX
+   movq(r10, rsp);
+   andq(rsp, -16);
+   pushq(r10);
+   pushq(r11);
+
+   movl(rdi, ThreadLocalStorage::thread_index());
+   call(RuntimeAddress(CAST_FROM_FN_PTR(address, pthread_getspecific)));
+
+   popq(r11);
+   popq(rsp);
+   popq(r10);
+   popq(r9);
+   popq(r8);
+   popq(rcx);
+   popq(rdx);
+   popq(rsi);
+   popq(rdi);
+   if (thread != rax) {
+       movq(thread, rax);
+       popq(rax);
+   }
+}
+
+// NOTE: since the linux kernel resides at the low end of
+// user address space, no null pointer check is needed.
+bool MacroAssembler::needs_explicit_null_check(int offset) {
+  return offset < 0 || offset >= 0x100000;
+}