Avoid using RecordWrite with the context (esi, rsi, cp) as...

src/arm/macro-assembler-arm.cc

 // Copyright 2006-2009 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 187 matching lines @@
                               Condition cond) {
   ldr(destination, MemOperand(r10, index << kPointerSizeLog2), cond);
 }
 
 
 // Will clobber 4 registers: object, offset, scratch, ip.  The
 // register 'object' contains a heap object pointer.  The heap object
 // tag is shifted away.
 void MacroAssembler::RecordWrite(Register object, Register offset,
                                  Register scratch) {
+  // The compiled code assumes that record write doesn't change the
+  // context register, so we check that none of the clobbered
+  // registers are cp.
+  ASSERT(!object.is(cp) && !offset.is(cp) && !scratch.is(cp));
+
   // This is how much we shift the remembered set bit offset to get the
   // offset of the word in the remembered set.  We divide by kBitsPerInt (32,
   // shift right 5) and then multiply by kIntSize (4, shift left 2).
   const int kRSetWordShift = 3;
 
   Label fast, done;
 
   // First, test that the object is not in the new space.  We cannot set
   // remembered set bits in the new space.
   // object: heap object pointer (with tag)
@@ skipping 1076 matching lines @@
 }
 
 
 void CodePatcher::Emit(Address addr) {
   masm()->emit(reinterpret_cast<Instr>(addr));
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal