ARMv7 ubfx support...

src/platform-linux.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 71 matching lines @@
   uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
   srandom(static_cast<unsigned int>(seed));
 }
 
 
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
 #if (defined(__VFP_FP__) && !defined(__SOFTFP__))
   // Here gcc is telling us that we are on an ARM and gcc is assuming that we
   // have VFP3 instructions.  If gcc can assume it then so can we.
   return 1u << VFP3;
+#elif CAN_USE_ARMV7_INSTRUCTIONS
+  return 1u << ARMv7;
 #else
   return 0;  // Linux runs on anything.
 #endif
 }
 
 
 #ifdef __arm__
 bool OS::ArmCpuHasFeature(CpuFeature feature) {
   const char* search_string = NULL;
   const char* file_name = "/proc/cpuinfo";
   // Simple detection of VFP at runtime for Linux.
   // It is based on /proc/cpuinfo, which reveals hardware configuration
   // to user-space applications.  According to ARM (mid 2009), no similar
   // facility is universally available on the ARM architectures,
   // so it's up to individual OSes to provide such.
   //
   // This is written as a straight shot one pass parser
   // and not using STL string and ifstream because,
   // on Linux, it's reading from a (non-mmap-able)
   // character special device.
   switch (feature) {
     case VFP3:
       search_string = "vfp";
       break;
+    case ARMv7:
+      search_string = "ARMv7";
+      break;
     default:
       UNREACHABLE();
   }
 
   FILE* f = NULL;
   const char* what = search_string;
 
   if (NULL == (f = fopen(file_name, "r")))
     return false;
 
@@ skipping 699 matching lines @@
 
   // This sampler is no longer the active sampler.
   active_sampler_ = NULL;
   active_ = false;
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal