Adds Runtime call stub and Dart entry stub to ARM64.

runtime/vm/constants_arm64.h

 // Copyright (c) 2014, 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_ARM64_H_
 #define VM_CONSTANTS_ARM64_H_
 
 #include "platform/assert.h"
 
 namespace dart {
@@ skipping 34 matching lines @@
   R30 = 30,  // LR
   R31 = 31,  // ZR, SP
   kNumberOfCpuRegisters = 32,
   kNoRegister = -1,
 
   // These registers both use the encoding R31, but to avoid mistakes we give
   // them different values, and then translate before encoding.
   SP = 32,
   ZR = 33,
 
+  // SPREG is used from architecture independent code. It is only ever passed to
+  // Simulator::get_register(). Calls to get_register() from architecture
+  // independent code don't include an R31Type, so if we were to define
+  // SPREG to be R31, we wouldn't be able to distinguish from ZR. Therefore we
+  // use another value, and check for it in get_register().
+  SPREG = 34,
+
   // Aliases.
   IP0 = R16,
   IP1 = R17,
   FP = R29,
   LR = R30,
 };
 
 enum VRegister {
   V0  =  0,
   V1  =  1,
@@ skipping 39 matching lines @@
 typedef VRegister FpuRegister;
 const FpuRegister FpuTMP = VTMP0;
 const int kNumberOfFpuRegisters = kNumberOfVRegisters;
 const FpuRegister kNoFpuRegister = kNoVRegister;
 
 // Register aliases.
 const Register TMP = R16;  // Used as scratch register by assembler.
 const Register TMP2 = R17;
 const Register CTX = R28;  // Caches current context in generated code.
 const Register PP = R27;  // Caches object pool pointer in generated code.
-const Register SPREG = R31;  // Stack pointer register.
 const Register FPREG = FP;  // Frame pointer register.
 const Register ICREG = R5;  // IC data register.
 
 // Exception object is passed in this register to the catch handlers when an
 // exception is thrown.
 const Register kExceptionObjectReg = R0;
 
 // Stack trace object is passed in this register to the catch handlers when
 // an exception is thrown.
 const Register kStackTraceObjectReg = R1;
 
 // Masks, sizes, etc.
 const int kXRegSizeInBits = 64;
 const int kWRegSizeInBits = 32;
 const int64_t kXRegMask = 0xffffffffffffffffL;
 const int64_t kWRegMask = 0x00000000ffffffffL;
 
 // List of registers used in load/store multiple.
 typedef uint32_t RegList;
 const RegList kAllCpuRegistersList = 0xFFFF;
 
 
 // C++ ABI call registers.
 const RegList kAbiArgumentCpuRegs =
     (1 << R0) | (1 << R1) | (1 << R2) | (1 << R3) |
     (1 << R4) | (1 << R5) | (1 << R6) | (1 << R7);
 const RegList kAbiPreservedCpuRegs =
     (1 << R19) | (1 << R20) | (1 << R21) | (1 << R22) |
     (1 << R23) | (1 << R24) | (1 << R25) | (1 << R26) |
-    (1 << R27) | (1 << R28) | (1 << R29);
-const int kAbiPreservedCpuRegCount = 11;
+    (1 << R27) | (1 << R28);
+const int kAbiPreservedCpuRegCount = 10;
 const VRegister kAbiFirstPreservedFpuReg = V8;
 const VRegister kAbiLastPreservedFpuReg = V15;
 const int kAbiPreservedFpuRegCount = 8;
 
 // CPU registers available to Dart allocator.
 const RegList kDartAvailableCpuRegs =
     (1 << R0)  | (1 << R1)  | (1 << R2)  | (1 << R3)  |
     (1 << R4)  | (1 << R5)  | (1 << R6)  | (1 << R7)  |
     (1 << R8)  | (1 << R9)  | (1 << R10) | (1 << R11) |
     (1 << R12) | (1 << R13) | (1 << R14) | (1 << R15) |
@@ skipping 422 matching lines @@
   enum {
     kInstrSize = 4,
     kInstrSizeLog2 = 2,
     kPCReadOffset = 8
   };
 
   static const int32_t kNopInstruction = HINT;  // hint #0 === nop.
   static const int32_t kBreakPointInstruction =  // hlt #kImmExceptionIsDebug.
       HLT | (kImmExceptionIsDebug << kImm16Shift);
   static const int kBreakPointInstructionSize = kInstrSize;
+  static const int32_t kRedirectInstruction =
+      HLT | (kImmExceptionIsRedirectedCall << kImm16Shift);
 
   // Read one particular bit out of the instruction bits.
   inline int Bit(int nr) const {
     return (InstructionBits() >> nr) & 1;
   }
 
   // Read a bit field out of the instruction bits.
   inline int Bits(int shift, int count) const {
     return (InstructionBits() >> shift) & ((1 << count) - 1);
   }
@@ skipping 193 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_ARM64_H_