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comparison src/os_cpu/linux_x86/vm/assembler_linux_x86_32.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 7793bd37a336
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_assembler_linux_x86_32.cpp.incl"
27
28 void MacroAssembler::int3() {
29 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
30 }
31
32 void MacroAssembler::get_thread(Register thread) {
33 movl(thread, rsp);
34 shrl(thread, PAGE_SHIFT);
35
36 ExternalAddress tls_base((address)ThreadLocalStorage::sp_map_addr());
37 Address index(noreg, thread, Address::times_4);
38 ArrayAddress tls(tls_base, index);
39
40 movptr(thread, tls);
41 }
42
43 bool MacroAssembler::needs_explicit_null_check(int offset) {
44 // Linux kernel guarantees that the first page is always unmapped. Don't
45 // assume anything more than that.
46 bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
47 return !offset_in_first_page;
48 }