A64: Fix sampling of fp register for CPU profile and bailout if sp or fp is zero.

src/a64/simulator-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
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 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
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@@ skipping 422 matching lines @@
   }
 
   template<typename T>
   inline void set_sp(T value) {
     ASSERT(sizeof(T) == kPointerSize);
     set_reg(31, value, Reg31IsStackPointer);
   }
 
   inline int64_t sp() { return xreg(31, Reg31IsStackPointer); }
   inline int64_t jssp() { return xreg(kJSSPCode, Reg31IsStackPointer); }
+  inline int64_t fp() { return xreg(29, Reg31IsStackPointer); }

[jbramley, 2014/01/27 10:40:21]

We have a kFramePointerRegCode.

[ulan, 2014/01/27 10:55:06]

Done.

   inline Instruction* lr() { return reg<Instruction*>(kLinkRegCode); }
 
   // Return 'size' bits of the value of a floating-point register, as the
   // specified type. The value is zero-extended to fill the result.
   //
   // The only supported values of 'size' are kDRegSize and kSRegSize.
   template<typename T>
   inline T fpreg(unsigned size, unsigned code) const {
     unsigned size_in_bytes = size / 8;
     ASSERT(size_in_bytes <= sizeof(T));
@@ skipping 394 matching lines @@
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 #endif  // !defined(USE_SIMULATOR)
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_SIMULATOR_A64_H_