| // 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/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" |
| #endif |
| |
| 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::GetArchitecture() == |
| base::win::OSInfo::X64_ARCHITECTURE) { |
| return "x86-64"; |
| } |
| return "x86-32"; |
| #elif ARCH_CPU_64_BITS |
| return "x86-64"; |
| #else |
| return "x86-32"; |
| #endif // defined(OS_WIN) |
| |
| #else |
| #error Architecture not supported. |
| #endif |
| } |
| |
| 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 allowlist 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 |
