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1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
11 // with the distribution. | 11 // with the distribution. |
12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
15 // | 15 // |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 // CPU specific code for x64 independent of OS goes here. | 28 // CPU specific code for x64 independent of OS goes here. |
29 | 29 |
| 30 #ifdef __GNUC__ |
| 31 #include "third_party/valgrind/valgrind.h" |
| 32 #endif |
| 33 |
30 #include "v8.h" | 34 #include "v8.h" |
31 | 35 |
32 #include "cpu.h" | 36 #include "cpu.h" |
33 #include "macro-assembler.h" | 37 #include "macro-assembler.h" |
34 | 38 |
35 namespace v8 { | 39 namespace v8 { |
36 namespace internal { | 40 namespace internal { |
37 | 41 |
38 void CPU::Setup() { | 42 void CPU::Setup() { |
39 CpuFeatures::Probe(); | 43 CpuFeatures::Probe(); |
40 } | 44 } |
41 | 45 |
42 | 46 |
43 void CPU::FlushICache(void* start, size_t size) { | 47 void CPU::FlushICache(void* start, size_t size) { |
44 // No need to flush the instruction cache on Intel. On Intel instruction | 48 // No need to flush the instruction cache on Intel. On Intel instruction |
45 // cache flushing is only necessary when multiple cores running the same | 49 // cache flushing is only necessary when multiple cores running the same |
46 // code simultaneously. V8 (and JavaScript) is single threaded and when code | 50 // code simultaneously. V8 (and JavaScript) is single threaded and when code |
47 // is patched on an intel CPU the core performing the patching will have its | 51 // is patched on an intel CPU the core performing the patching will have its |
48 // own instruction cache updated automatically. | 52 // own instruction cache updated automatically. |
49 | 53 |
50 // If flushing of the instruction cache becomes necessary Windows has the | 54 // If flushing of the instruction cache becomes necessary Windows has the |
51 // API function FlushInstructionCache. | 55 // API function FlushInstructionCache. |
| 56 |
| 57 // By default, valgrind only checks the stack for writes that might need to |
| 58 // invalidate already cached translated code. This leads to random |
| 59 // instability when code patches or moves are sometimes unnoticed. One |
| 60 // solution is to run valgrind with --smc-check=all, but this comes at a big |
| 61 // performance cost. We can notify valgrind to invalidate its cache. |
| 62 #ifdef VALGRIND_DISCARD_TRANSLATIONS |
| 63 VALGRIND_DISCARD_TRANSLATIONS(start, size); |
| 64 #endif |
52 } | 65 } |
53 | 66 |
54 | 67 |
55 void CPU::DebugBreak() { | 68 void CPU::DebugBreak() { |
56 #ifdef _MSC_VER | 69 #ifdef _MSC_VER |
57 // To avoid Visual Studio runtime support the following code can be used | 70 // To avoid Visual Studio runtime support the following code can be used |
58 // instead | 71 // instead |
59 // __asm { int 3 } | 72 // __asm { int 3 } |
60 __debugbreak(); | 73 __debugbreak(); |
61 #else | 74 #else |
62 asm("int $3"); | 75 asm("int $3"); |
63 #endif | 76 #endif |
64 } | 77 } |
65 | 78 |
66 } } // namespace v8::internal | 79 } } // namespace v8::internal |
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