Fix vm code base so that it can be built for --arch=simarm (no snapshot yet).

runtime/vm/constants_arm.h

Index: runtime/vm/constants_arm.h
===================================================================
--- runtime/vm/constants_arm.h	(revision 17245)
+++ runtime/vm/constants_arm.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -7,6 +7,14 @@
 
 namespace dart {
 
+// We support both VFPv3-D16 and VFPv3-D32 profiles, but currently only one at
+// a time.
+#define VFPv3_D16
+#if defined(VFPv3_D16) == defined(VFPv3_D32)
+#error "Exactly one of VFPv3_D16 or VFPv3_D32 can be defined at a time."
+#endif
+
+
 enum Register {
   R0  =  0,
   R1  =  1,
@@ -29,11 +37,107 @@
   SP  = 13,
   LR  = 14,
   PC  = 15,
-  kNumberOfCoreRegisters = 16,
+  kNumberOfCpuRegisters = 16,
   kNoRegister = -1,
 };
 
 
+// Values for single-precision floating point registers.
+enum SRegister {
+  S0  =  0,
+  S1  =  1,
+  S2  =  2,
+  S3  =  3,
+  S4  =  4,
+  S5  =  5,
+  S6  =  6,
+  S7  =  7,
+  S8  =  8,
+  S9  =  9,
+  S10 = 10,
+  S11 = 11,
+  S12 = 12,
+  S13 = 13,
+  S14 = 14,
+  S15 = 15,
+  S16 = 16,
+  S17 = 17,
+  S18 = 18,
+  S19 = 19,
+  S20 = 20,
+  S21 = 21,
+  S22 = 22,
+  S23 = 23,
+  S24 = 24,
+  S25 = 25,
+  S26 = 26,
+  S27 = 27,
+  S28 = 28,
+  S29 = 29,
+  S30 = 30,
+  S31 = 31,
+  kNumberOfSRegisters = 32,
+  kNoSRegister = -1,
+};
+
+
+// Values for double-precision floating point registers.
+enum DRegister {
+  D0  =  0,
+  D1  =  1,
+  D2  =  2,
+  D3  =  3,
+  D4  =  4,
+  D5  =  5,
+  D6  =  6,
+  D7  =  7,
+  D8  =  8,
+  D9  =  9,
+  D10 = 10,
+  D11 = 11,
+  D12 = 12,
+  D13 = 13,
+  D14 = 14,
+  D15 = 15,
+#ifdef VFPv3_D16
+  kNumberOfDRegisters = 16,
+#else
+  D16 = 16,
+  D17 = 17,
+  D18 = 18,
+  D19 = 19,
+  D20 = 20,
+  D21 = 21,
+  D22 = 22,
+  D23 = 23,
+  D24 = 24,
+  D25 = 25,
+  D26 = 26,
+  D27 = 27,
+  D28 = 28,
+  D29 = 29,
+  D30 = 30,
+  D31 = 31,
+  kNumberOfDRegisters = 32,
+#endif
+  kNumberOfOverlappingDRegisters = 16,
+  kNoDRegister = -1,
+};
+
+
+// Architecture independent aliases.
+typedef DRegister FpuRegister;
+const FpuRegister FpuTMP = D0;
+const int kNumberOfFpuRegisters = kNumberOfDRegisters;
+
+
+// Register aliases.
+const Register TMP = kNoRegister;  // No scratch register used by assembler.
+const Register CTX = R9;           // Caches current context in generated code.
+const Register SPREG = SP;
+const Register FPREG = FP;
+
+
 // Values for the condition field as defined in section A3.2.
 enum Condition {
   kNoCondition = -1,