1a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Copyright 2006-2008 the V8 project authors. All rights reserved. 2a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Redistribution and use in source and binary forms, with or without 3a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// modification, are permitted provided that the following conditions are 4a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// met: 5a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 6a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Redistributions of source code must retain the above copyright 7a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// notice, this list of conditions and the following disclaimer. 8a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Redistributions in binary form must reproduce the above 9a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// copyright notice, this list of conditions and the following 10a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// disclaimer in the documentation and/or other materials provided 11a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// with the distribution. 12a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Neither the name of Google Inc. nor the names of its 13a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// contributors may be used to endorse or promote products derived 14a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// from this software without specific prior written permission. 15a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 16a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 28a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// CPU specific code for ia32 independent of OS goes here. 29a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 30a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef __GNUC__ 31a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#include "third_party/valgrind/valgrind.h" 32a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 33a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 34a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#include "v8.h" 35a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 36a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#include "cpu.h" 37a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#include "macro-assembler.h" 38a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 39a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace v8 { 40a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace internal { 41a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 42a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockvoid CPU::Setup() { 43a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CpuFeatures::Probe(); 44a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} 45a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 46a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 47a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockvoid CPU::FlushICache(void* start, size_t size) { 48a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // No need to flush the instruction cache on Intel. On Intel instruction 49a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // cache flushing is only necessary when multiple cores running the same 50a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // code simultaneously. V8 (and JavaScript) is single threaded and when code 51a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // is patched on an intel CPU the core performing the patching will have its 52a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // own instruction cache updated automatically. 53a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 54a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // If flushing of the instruction cache becomes necessary Windows has the 55a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // API function FlushInstructionCache. 56a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 57a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // By default, valgrind only checks the stack for writes that might need to 58a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // invalidate already cached translated code. This leads to random 59a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // instability when code patches or moves are sometimes unnoticed. One 60a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // solution is to run valgrind with --smc-check=all, but this comes at a big 61a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // performance cost. We can notify valgrind to invalidate its cache. 62a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef VALGRIND_DISCARD_TRANSLATIONS 63a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block VALGRIND_DISCARD_TRANSLATIONS(start, size); 64a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 65a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} 66a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 67a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 68a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockvoid CPU::DebugBreak() { 69a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef _MSC_VER 70a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // To avoid Visual Studio runtime support the following code can be used 71a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // instead 72a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // __asm { int 3 } 73a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block __debugbreak(); 74a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#else 75a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block asm("int $3"); 76a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 77a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} 78a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 79a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} } // namespace v8::internal 80