Add mips skeleton sources.

runtime/vm/constants_mips.h

Index: runtime/vm/constants_mips.h
===================================================================
--- runtime/vm/constants_mips.h	(revision 0)
+++ runtime/vm/constants_mips.h	(revision 0)
@@ -0,0 +1,108 @@
+// 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.
+
+#ifndef VM_CONSTANTS_MIPS_H_
+#define VM_CONSTANTS_MIPS_H_
+
+namespace dart {
+
+enum Register {
+  ZR =  0,
+  AT =  1,
+  V0 =  2,
+  V1 =  3,
+  A0 =  4,
+  A1 =  5,
+  A2 =  6,
+  A3 =  7,
+  T0 =  8,
+  T1 =  9,
+  T2 = 10,
+  T3 = 11,
+  T4 = 12,
+  T5 = 13,
+  T6 = 14,
+  T7 = 15,
+  S0 = 16,
+  S1 = 17,
+  S2 = 18,
+  S3 = 19,
+  S4 = 20,
+  S5 = 21,
+  S6 = 22,
+  S7 = 23,
+  T8 = 24,
+  T9 = 25,
+  K0 = 26,
+  K1 = 27,
+  GP = 28,
+  SP = 29,
+  FP = 30,
+  RA = 31,
+  kNumberOfCpuRegisters = 32,
+  kNoRegister = -1,
+};
+
+
+// Values for double-precision floating point registers.
+enum FRegister {
+  F0  =  0,
+  F1  =  1,
+  F2  =  2,
+  F3  =  3,
+  F4  =  4,
+  F5  =  5,
+  F6  =  6,
+  F7  =  7,
+  F8  =  8,
+  F9  =  9,
+  F10 = 10,
+  F11 = 11,
+  F12 = 12,
+  F13 = 13,
+  F14 = 14,
+  F15 = 15,
+  F16 = 16,
+  F17 = 17,
+  F18 = 18,
+  F19 = 19,
+  F20 = 20,
+  F21 = 21,
+  F22 = 22,
+  F23 = 23,
+  F24 = 24,
+  F25 = 25,
+  F26 = 26,
+  F27 = 27,
+  F28 = 28,
+  F29 = 29,
+  F30 = 30,
+  F31 = 31,
+  kNumberOfFRegisters = 32,
+  kNoFRegister = -1,
+};
+
+
+// Architecture independent aliases.
+typedef FRegister FpuRegister;
+const FpuRegister FpuTMP = F0;
+const int kNumberOfFpuRegisters = kNumberOfFRegisters;
+
+
+// Register aliases.
+const Register TMP = AT;
+const Register CTX = S7;  // Caches current context in generated code.
+const Register SPREG = SP;
+const Register FPREG = FP;
+
+
+// Values for the condition field.  // UNIMPLEMENTED.
+enum Condition {
+  kNoCondition = -1,
+  kMaxCondition = 16,
+};
+
+}  // namespace dart
+
+#endif  // VM_CONSTANTS_MIPS_H_