MIPS: Remove gp and sp from callee-saved register list.

src/mips/frames-mips.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 41 matching lines @@
 // Return the code of the n-th caller-saved register available to JavaScript
 // e.g. JSCallerSavedReg(0) returns a0.code() == 4.
 int JSCallerSavedCode(int n);
 
 
 // Callee-saved registers preserved when switching from C to JavaScript.
 static const RegList kCalleeSaved =
   // Saved temporaries.
   1 << 16 | 1 << 17 | 1 << 18 | 1 << 19 |
   1 << 20 | 1 << 21 | 1 << 22 | 1 << 23 |
-  // gp, sp, fp.
-  1 << 28 | 1 << 29 | 1 << 30;
+  // fp.
+  1 << 30;
 
-static const int kNumCalleeSaved = 11;
+static const int kNumCalleeSaved = 9;
 
 
 // Number of registers for which space is reserved in safepoints. Must be a
 // multiple of 8.
 // TODO(mips): Only 8 registers may actually be sufficient. Revisit.
 static const int kNumSafepointRegisters = 16;
 
 // Define the list of registers actually saved at safepoints.
 // Note that the number of saved registers may be smaller than the reserved
 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
@@ skipping 135 matching lines @@
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
 } }  // namespace v8::internal
 
 #endif