blob: 032af94d32b5efa9bdced29425d13a7e174a1e80 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/cpu.h"
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include "base/win/windows_version.h"
namespace nacl {
const char* GetSandboxArch() {
#if defined(ARCH_CPU_ARM_FAMILY)
return "arm";
#elif defined(ARCH_CPU_MIPS_FAMILY)
return "mips32";
#elif defined(ARCH_CPU_X86_FAMILY)
#if defined(OS_WIN)
// We have to check the host architecture on Windows.
// See sandbox_isa.h for an explanation why.
if (base::win::OSInfo::GetInstance()->architecture() ==
base::win::OSInfo::X64_ARCHITECTURE) {
return "x86-64";
return "x86-32";
#elif ARCH_CPU_64_BITS
return "x86-64";
return "x86-32";
#endif // defined(OS_WIN)
#error Architecture not supported.
std::string GetCpuFeatures() {
// PNaCl's translator from pexe to nexe can be told exactly what
// capabilities the user's machine has because the pexe to nexe
// translation is specific to the machine, and CPU information goes
// into the translation cache. This allows the translator to generate
// faster code.
// Care must be taken to avoid instructions which aren't supported by
// the NaCl sandbox. Ideally the translator would do this, but there's
// no point in not doing the whitelist here.
// TODO(jfb) Some features are missing, either because the NaCl
// sandbox doesn't support them, because base::CPU doesn't
// detect them, or because they don't help vector shuffles
// (and we omit them because it simplifies testing). Add the
// other features.
// TODO(jfb) The following is x86-specific. The base::CPU class
// doesn't handle other architectures very well, and we
// should at least detect the presence of ARM's integer
// divide.
std::vector<base::StringPiece> features;
base::CPU cpu;
// On x86, SSE features are ordered: the most recent one implies the
// others. Care is taken here to only specify the latest SSE version,
// whereas non-SSE features don't follow this model: POPCNT is
// effectively always implied by SSE4.2 but has to be specified
// separately.
// TODO: AVX2, AVX, SSE 4.2.
if (cpu.has_sse41()) features.push_back("+sse4.1");
// TODO: SSE 4A, SSE 4.
else if (cpu.has_ssse3()) features.push_back("+ssse3");
// TODO: SSE 3
else if (cpu.has_sse2()) features.push_back("+sse2");
if (cpu.has_popcnt()) features.push_back("+popcnt");
// TODO: AES, LZCNT, ...
return base::JoinString(features, ",");
} // namespace nacl