Mercurial > hg > truffle
annotate src/share/vm/runtime/icache.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1748 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
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4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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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. | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/resourceArea.hpp" | |
27 #include "runtime/icache.hpp" | |
0 | 28 |
29 // The flush stub function address | |
30 AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL; | |
31 | |
32 void AbstractICache::initialize() { | |
33 // Making this stub must be FIRST use of assembler | |
34 ResourceMark rm; | |
35 | |
36 BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size); | |
1748 | 37 CodeBuffer c(b); |
0 | 38 |
39 ICacheStubGenerator g(&c); | |
40 g.generate_icache_flush(&_flush_icache_stub); | |
41 | |
42 // The first use of flush_icache_stub must apply it to itself. | |
43 // The StubCodeMark destructor in generate_icache_flush will | |
44 // call Assembler::flush, which in turn will call invalidate_range, | |
45 // which will in turn call the flush stub. Thus we don't need an | |
46 // explicit call to invalidate_range here. This assumption is | |
47 // checked in invalidate_range. | |
48 } | |
49 | |
50 void AbstractICache::call_flush_stub(address start, int lines) { | |
51 // The business with the magic number is just a little security. | |
52 // We cannot call the flush stub when generating the flush stub | |
53 // because it isn't there yet. So, the stub also returns its third | |
54 // parameter. This is a cheap check that the stub was really executed. | |
55 static int magic = 0xbaadbabe; | |
56 | |
57 int auto_magic = magic; // Make a local copy to avoid race condition | |
58 int r = (*_flush_icache_stub)(start, lines, auto_magic); | |
59 guarantee(r == auto_magic, "flush stub routine did not execute"); | |
60 ++magic; | |
61 } | |
62 | |
63 void AbstractICache::invalidate_word(address addr) { | |
64 // Because this is called for instruction patching on the fly, long after | |
65 // bootstrapping, we execute the stub directly. Account for a 4-byte word | |
66 // spanning two cache lines by computing a start line address by rounding | |
67 // addr down to a line_size boundary, and an end line address by adding | |
68 // the word size - 1 and rounding the result down to a line_size boundary. | |
69 // If we just added word size, we'd mistakenly flush the next cache line | |
70 // if the word to be flushed started in the last 4 bytes of the line. | |
71 // Doing that would segv if the next line weren't mapped. | |
72 | |
73 const int word_size_in_bytes = 4; // Always, regardless of platform | |
74 | |
75 intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1); | |
76 intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1) | |
77 & ~(ICache::line_size - 1); | |
78 (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0); | |
79 } | |
80 | |
81 void AbstractICache::invalidate_range(address start, int nbytes) { | |
82 static bool firstTime = true; | |
83 if (firstTime) { | |
84 guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub), | |
85 "first flush should be for flush stub"); | |
86 firstTime = false; | |
87 return; | |
88 } | |
89 if (nbytes == 0) { | |
90 return; | |
91 } | |
92 // Align start address to an icache line boundary and transform | |
93 // nbytes to an icache line count. | |
94 const uint line_offset = mask_address_bits(start, ICache::line_size-1); | |
95 if (line_offset != 0) { | |
96 start -= line_offset; | |
97 nbytes += line_offset; | |
98 } | |
99 call_flush_stub(start, round_to(nbytes, ICache::line_size) >> | |
100 ICache::log2_line_size); | |
101 } | |
102 | |
103 // For init.cpp | |
104 void icache_init() { | |
105 ICache::initialize(); | |
106 } |