Adds Stop to MIPS. Starts on MIPS call patcher.

runtime/vm/simulator_mips.cc

 // Copyright (c) 2013, 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_MIPS)
 
 // Only build the simulator if not compiling for real MIPS hardware.
 #if !defined(HOST_ARCH_MIPS)
 
@@ skipping 693 matching lines @@
     }
     case AND: {
       ASSERT(instr->SaField() == 0);
       // Format(instr, "and 'rd, 'rs, 'rt");
       int32_t rs_val = get_register(instr->RsField());
       int32_t rt_val = get_register(instr->RtField());
       set_register(instr->RdField(), rs_val & rt_val);
       break;
     }
     case BREAK: {
-      SimulatorDebugger dbg(this);
-      dbg.Stop(instr, "breakpoint");
+      if (instr->BreakCodeField() == Instr::kStopMessageCode) {
+        SimulatorDebugger dbg(this);
+        const char* message = *reinterpret_cast<const char**>(
+            reinterpret_cast<intptr_t>(instr) - Instr::kInstrSize);
+        set_pc(get_pc() + Instr::kInstrSize);
+        dbg.Stop(instr, message);
+      } else {
+        SimulatorDebugger dbg(this);
+        dbg.Stop(instr, "breakpoint");
+      }
       break;
     }
     case DIV: {
       ASSERT(instr->RdField() == 0);
       ASSERT(instr->SaField() == 0);
       // Format(instr, "div 'rs, 'rt");
       int32_t rs_val = get_register(instr->RsField());
       int32_t rt_val = get_register(instr->RtField());
       if (rt_val == 0) {
         // Results are unpredictable.
@@ skipping 661 matching lines @@
   // Restore the SP register and return R1:R0.
   set_register(SP, sp_before_call);
   return Utils::LowHighTo64Bits(get_register(V0), get_register(V1));
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS