Fixes to support ARMv5 lego mindstorm.

runtime/vm/cpu_arm.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/cpuinfo.h"
@@ skipping 51 matching lines @@
   "arm";
 }
 
 
 bool HostCPUFeatures::integer_division_supported_ = false;
 bool HostCPUFeatures::vfp_supported_ = false;
 bool HostCPUFeatures::neon_supported_ = false;
 bool HostCPUFeatures::hardfp_supported_ = false;
 const char* HostCPUFeatures::hardware_ = NULL;
 ARMVersion HostCPUFeatures::arm_version_ = ARMvUnknown;
+intptr_t HostCPUFeatures::store_pc_read_offset_ = 8;
 #if defined(DEBUG)
 bool HostCPUFeatures::initialized_ = false;
 #endif
 
 
 #if defined(HOST_ARCH_ARM)
 void HostCPUFeatures::InitOnce() {
   CpuInfo::InitOnce();
   hardware_ = CpuInfo::GetCpuModel();
 
   // Has floating point unit.
   vfp_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "vfp") &&
                    FLAG_use_vfp;
 
   // Check for ARMv5, ARMv6 or ARMv7. It can be in either the Processor or
   // Model information fields.
   if (CpuInfo::FieldContains(kCpuInfoProcessor, "ARM926EJ-S") ||
       CpuInfo::FieldContains(kCpuInfoModel, "ARM926EJ-S")) {
     // Lego Mindstorm EV3.
     arm_version_ = ARMv5TE;
+    // On ARMv5, the PC read offset in an STR or STM instruction is either 8 or
+    // 12 bytes depending on the implementation. On the Mindstorm EV3 it is 12
+    // bytes.
+    store_pc_read_offset_ = 12;
   } else if (CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv6") ||
              CpuInfo::FieldContains(kCpuInfoModel, "ARMv6")) {
     // Raspberry Pi, etc.
     arm_version_ = ARMv6;
   } else {
     ASSERT(CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7") ||
            CpuInfo::FieldContains(kCpuInfoModel, "ARMv7"));
     arm_version_ = ARMv7;
   }
 
@@ skipping 66 matching lines @@
   ASSERT(hardware_ != NULL);
   free(const_cast<char*>(hardware_));
   hardware_ = NULL;
   CpuInfo::Cleanup();
 }
 #endif  // defined(HOST_ARCH_ARM)
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM