ager@chromium.org | 5ec4892 | 2009-05-05 07:25:34 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 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. |
| 27 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 28 | // CPU specific code for x64 independent of OS goes here. |
| 29 | |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 30 | #ifdef __GNUC__ |
| 31 | #include "third_party/valgrind/valgrind.h" |
| 32 | #endif |
| 33 | |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 34 | #include "v8.h" |
| 35 | |
| 36 | #include "cpu.h" |
| 37 | #include "macro-assembler.h" |
| 38 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 39 | namespace v8 { |
| 40 | namespace internal { |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 41 | |
| 42 | void CPU::Setup() { |
| 43 | CpuFeatures::Probe(); |
| 44 | } |
| 45 | |
| 46 | |
| 47 | void CPU::FlushICache(void* start, size_t size) { |
| 48 | // No need to flush the instruction cache on Intel. On Intel instruction |
| 49 | // cache flushing is only necessary when multiple cores running the same |
| 50 | // code simultaneously. V8 (and JavaScript) is single threaded and when code |
| 51 | // is patched on an intel CPU the core performing the patching will have its |
| 52 | // own instruction cache updated automatically. |
| 53 | |
| 54 | // If flushing of the instruction cache becomes necessary Windows has the |
| 55 | // API function FlushInstructionCache. |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 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 |
kasperl@chromium.org | b3284ad | 2009-05-18 06:12:45 +0000 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | |
| 68 | void CPU::DebugBreak() { |
| 69 | #ifdef _MSC_VER |
| 70 | // To avoid Visual Studio runtime support the following code can be used |
| 71 | // instead |
| 72 | // __asm { int 3 } |
| 73 | __debugbreak(); |
| 74 | #else |
| 75 | asm("int $3"); |
| 76 | #endif |
| 77 | } |
| 78 | |
| 79 | } } // namespace v8::internal |