1// Copyright 2011 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 28// CPU specific code for ia32 independent of OS goes here. 29 30#ifdef __GNUC__ 31#include "third_party/valgrind/valgrind.h" 32#endif 33 34#include "v8.h" 35 36#if defined(V8_TARGET_ARCH_IA32) 37 38#include "cpu.h" 39#include "macro-assembler.h" 40 41namespace v8 { 42namespace internal { 43 44void CPU::SetUp() { 45 CpuFeatures::Probe(); 46} 47 48 49bool CPU::SupportsCrankshaft() { 50 return CpuFeatures::IsSupported(SSE2); 51} 52 53 54void CPU::FlushICache(void* start, size_t size) { 55 // No need to flush the instruction cache on Intel. On Intel instruction 56 // cache flushing is only necessary when multiple cores running the same 57 // code simultaneously. V8 (and JavaScript) is single threaded and when code 58 // is patched on an intel CPU the core performing the patching will have its 59 // own instruction cache updated automatically. 60 61 // If flushing of the instruction cache becomes necessary Windows has the 62 // API function FlushInstructionCache. 63 64 // By default, valgrind only checks the stack for writes that might need to 65 // invalidate already cached translated code. This leads to random 66 // instability when code patches or moves are sometimes unnoticed. One 67 // solution is to run valgrind with --smc-check=all, but this comes at a big 68 // performance cost. We can notify valgrind to invalidate its cache. 69#ifdef VALGRIND_DISCARD_TRANSLATIONS 70 unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size); 71 USE(res); 72#endif 73} 74 75 76void CPU::DebugBreak() { 77#ifdef _MSC_VER 78 // To avoid Visual Studio runtime support the following code can be used 79 // instead 80 // __asm { int 3 } 81 __debugbreak(); 82#else 83 asm("int $3"); 84#endif 85} 86 87} } // namespace v8::internal 88 89#endif // V8_TARGET_ARCH_IA32 90