[v8-dev] ARM: Make double registers low/high safe

src/arm/simulator-arm.cc

 // Copyright 2012 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 3093 matching lines @@
                (instr->Bit(23) == 0x0)) {
       // vmov (ARM core register to scalar)
       int vd = instr->Bits(19, 16) | (instr->Bit(7) << 4);
       double dd_value = get_double_from_d_register(vd);
       int32_t data[2];
       OS::MemCopy(data, &dd_value, 8);
       data[instr->Bit(21)] = get_register(instr->RtValue());
       OS::MemCopy(&dd_value, data, 8);
       set_d_register_from_double(vd, dd_value);
     } else if ((instr->VLValue() == 0x1) &&
+               (instr->VCValue() == 0x1) &&
+               (instr->Bit(23) == 0x0)) {
+      // vmov (scalar to ARM core register)
+      int vn = instr->Bits(19, 16) | (instr->Bit(7) << 4);
+      double dn_value = get_double_from_d_register(vn);
+      int32_t data[2];
+      OS::MemCopy(data, &dn_value, 8);
+      set_register(instr->RtValue(), data[instr->Bit(21)]);
+    } else if ((instr->VLValue() == 0x1) &&
                (instr->VCValue() == 0x0) &&
                (instr->VAValue() == 0x7) &&
                (instr->Bits(19, 16) == 0x1)) {
       // vmrs
       uint32_t rt = instr->RtValue();
       if (rt == 0xF) {
         Copy_FPSCR_to_APSR();
       } else {
         // Emulate FPSCR from the Simulator flags.
         uint32_t fpscr = (n_flag_FPSCR_ << 31) |
@@ skipping 772 matching lines @@
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM