icache_x86.cpp revision 3883:cd3d6a6b95d9 
1/*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "asm/macroAssembler.hpp"
27#include "runtime/icache.hpp"
28
29#define __ _masm->
30
31void ICacheStubGenerator::generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub) {
32  StubCodeMark mark(this, "ICache", "flush_icache_stub");
33
34  address start = __ pc();
35#ifdef AMD64
36
37  const Register addr  = c_rarg0;
38  const Register lines = c_rarg1;
39  const Register magic = c_rarg2;
40
41  Label flush_line, done;
42
43  __ testl(lines, lines);
44  __ jcc(Assembler::zero, done);
45
46  // Force ordering wrt cflush.
47  // Other fence and sync instructions won't do the job.
48  __ mfence();
49
50  __ bind(flush_line);
51  __ clflush(Address(addr, 0));
52  __ addptr(addr, ICache::line_size);
53  __ decrementl(lines);
54  __ jcc(Assembler::notZero, flush_line);
55
56  __ mfence();
57
58  __ bind(done);
59
60#else
61  const Address magic(rsp, 3*wordSize);
62  __ lock(); __ addl(Address(rsp, 0), 0);
63#endif // AMD64
64  __ movptr(rax, magic); // Handshake with caller to make sure it happened!
65  __ ret(0);
66
67  // Must be set here so StubCodeMark destructor can call the flush stub.
68  *flush_icache_stub = (ICache::flush_icache_stub_t)start;
69}
70
71#undef __
72