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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 
41 namespace v8 {
42 namespace internal {
43 
SetUp()44 void CPU::SetUp() {
45   CpuFeatures::Probe();
46 }
47 
48 
SupportsCrankshaft()49 bool CPU::SupportsCrankshaft() {
50   return CpuFeatures::IsSupported(SSE2);
51 }
52 
53 
FlushICache(void * start,size_t size)54 void 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 
DebugBreak()76 void 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