A64: Make 'debug BREAK' instructions halt on real hardware.

src/a64/assembler-a64.cc

 // Copyright 2013 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
@@ skipping 1790 matching lines @@
   // Refer to instructions-a64.h for a description of the marker and its
   // arguments.
   hlt(kImmExceptionIsDebug);
   ASSERT(SizeOfCodeGeneratedSince(&start) == kDebugCodeOffset);
   dc32(code);
   ASSERT(SizeOfCodeGeneratedSince(&start) == kDebugParamsOffset);
   dc32(params);
   ASSERT(SizeOfCodeGeneratedSince(&start) == kDebugMessageOffset);
   EmitStringData(message);
   hlt(kImmExceptionIsUnreachable);
+#else
+  if (params & BREAK) {
+    hlt(kImmExceptionIsDebug);
+  }
 #endif
 }
 
 
 void Assembler::Logical(const Register& rd,
                         const Register& rn,
                         const Operand& operand,
                         LogicalOp op) {
   ASSERT(rd.SizeInBits() == rn.SizeInBits());
   ASSERT(!operand.NeedsRelocation());
@@ skipping 684 matching lines @@
   // code.
 #ifdef ENABLE_DEBUGGER_SUPPORT
   RecordRelocInfo(RelocInfo::CONST_POOL, static_cast<intptr_t>(size));
 #endif
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64