Adds mrc instruction to arm simulator, assembler, disassembler.

runtime/vm/simulator_arm.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_ARM)
 
 // Only build the simulator if not compiling for real ARM hardware.
 #if !defined(HOST_ARCH_ARM)
 
 #include "vm/simulator.h"
 
 #include "vm/assembler.h"
 #include "vm/constants_arm.h"
 #include "vm/disassembler.h"
 #include "vm/native_arguments.h"
 #include "vm/thread.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, trace_sim, false, "Trace simulator execution.");
 DEFINE_FLAG(int, stop_sim_at, 0, "Address to stop simulator at.");
+DEFINE_FLAG(bool, sim_has_int_div, false, "Simulator implements sdiv and udiv");

[regis, 2013/03/04 21:54:52]

not necessary.

 
 
 // This macro provides a platform independent use of sscanf. The reason for
 // SScanF not being implemented in a platform independent way through
 // OS in the same way as SNPrint is that the Windows C Run-Time
 // Library does not provide vsscanf.
 #define SScanF sscanf  // NOLINT
 
 
 // Unimplemented counter class for debugging and measurement purposes.
@@ skipping 2541 matching lines @@
                  (instr->Bits(12, 4) == 0xf)) {
         // Format(instr, "vmstat'cond");
         n_flag_ = fp_n_flag_;
         z_flag_ = fp_z_flag_;
         c_flag_ = fp_c_flag_;
         v_flag_ = fp_v_flag_;
       } else {
         UNIMPLEMENTED();
       }
     }
+  } else if (instr->IsMrcIdIsar0()) {
+    // mrc of ID_ISAR0
+    Register rd = instr->RdField();
+    if (FLAG_sim_has_int_div) {

[regis, 2013/03/04 21:54:52]

Test CPUFeatures instead.

+      set_register(rd, 0x02100010);  // sim has sdiv, udiv, bkpt and clz
+    } else {
+      set_register(rd, 0x00100010);  // simulator has only bkpt and clz
+    }
   } else {
     UNIMPLEMENTED();
   }
 }
 
 
 // Executes the current instruction.
 void Simulator::InstructionDecode(Instr* instr) {
   pc_modified_ = false;
   if (FLAG_trace_sim) {
@@ skipping 202 matching lines @@
   // isolate->ChangeStateToGeneratedCode();
   set_register(kExceptionObjectReg, bit_cast<int32_t>(object.raw()));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_ARM)
 
 #endif  // defined TARGET_ARCH_ARM