Implements features to run "Hello, world!" on simulated MIPS.

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 <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
@@ skipping 733 matching lines @@
   SimulatorDebugger dbg(this);
   dbg.Stop(instr, buffer);
   // The debugger will return control in non-interactive mode.
   FATAL("Cannot continue execution after illegal memory access.");
 }
 
 
 void Simulator::UnalignedAccess(const char* msg, uword addr, Instr* instr) {
   // The debugger will not be able to single step past this instruction, but
   // it will be possible to disassemble the code and inspect registers.
-  char buffer[64];
+  char buffer[128];
   snprintf(buffer, sizeof(buffer),
-           "unaligned %s at 0x%"Px", pc=%p\n", msg, addr, instr);
+           "pc=%p, unaligned %s at 0x%"Px"\n",  instr, msg, addr);
   SimulatorDebugger dbg(this);
   dbg.Stop(instr, buffer);
   // The debugger will return control in non-interactive mode.
   FATAL("Cannot continue execution after unaligned access.");
 }
 
 
 // Returns the top of the stack area to enable checking for stack pointer
 // validity.
 uword Simulator::StackTop() const {
@@ skipping 131 matching lines @@
   ASSERT(instr->OpcodeField() == SPECIAL);
   ASSERT(instr->FunctionField() == BREAK);
   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);
     // Adjust for extra pc increment.
     set_pc(get_pc() - Instr::kInstrSize);
+  } else if (instr->BreakCodeField() == Instr::kMsgMessageCode) {
+    const char* message = *reinterpret_cast<const char**>(
+        reinterpret_cast<intptr_t>(instr) - Instr::kInstrSize);
+    if (FLAG_trace_sim) {
+      OS::Print("Message: %s\n", message);
+    } else {
+      OS::PrintErr("Bad break code: 0x%x\n", instr->InstructionBits());
+      UnimplementedInstruction(instr);
+    }
   } else if (instr->BreakCodeField() == Instr::kRedirectCode) {
     SimulatorSetjmpBuffer buffer(this);
 
     if (!setjmp(buffer.buffer_)) {
       int32_t saved_ra = get_register(RA);
       Redirection* redirection = Redirection::FromBreakInstruction(instr);
       uword external = redirection->external_function();
       if (FLAG_trace_sim) {
         OS::Print("Call to host function at 0x%"Pd"\n", external);
       }
@@ skipping 951 matching lines @@
     set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
   }
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS