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
generate_icache_flush(ICache::flush_icache_stub_t * flush_icache_stub)31 void 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