X64: Exit frame should use x64 ABI callee-save registers.

src/x64/macro-assembler-x64.cc

 // Copyright 2009 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 731 matching lines @@
   movq(rsp, rbp);
   pop(rbp);
 }
 
 
 
 void MacroAssembler::EnterExitFrame(StackFrame::Type type) {
   ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG);
 
   // Setup the frame structure on the stack.
+  // All constants are relative to the frame pointer of the exit frame.
   ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerFPOffset ==  0 * kPointerSize);
   push(rbp);
   movq(rbp, rsp);
 
   // Reserve room for entry stack pointer and push the debug marker.
   ASSERT(ExitFrameConstants::kSPOffset  == -1 * kPointerSize);
   push(Immediate(0));  // saved entry sp, patched before call
   push(Immediate(type == StackFrame::EXIT_DEBUG ? 1 : 0));
 
   // Save the frame pointer and the context in top.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   ExternalReference context_address(Top::k_context_address);
-  movq(rdi, rax);  // Backup rax before we use it.
+  movq(r14, rax);  // Backup rax before we use it.
 
   movq(rax, rbp);
   store_rax(c_entry_fp_address);
   movq(rax, rsi);
   store_rax(context_address);
 
   // Setup argv in callee-saved register r15. It is reused in LeaveExitFrame,
   // so it must be retained across the C-call.
   int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
-  lea(r15, Operand(rbp, rdi, times_pointer_size, offset));
+  lea(r15, Operand(rbp, r14, times_pointer_size, offset));
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Save the state of all registers to the stack from the memory
   // location. This is needed to allow nested break points.
   if (type == StackFrame::EXIT_DEBUG) {
     // TODO(1243899): This should be symmetric to
     // CopyRegistersFromStackToMemory() but it isn't! esp is assumed
     // correct here, but computed for the other call. Very error
     // prone! FIX THIS.  Actually there are deeper problems with
     // register saving than this asymmetry (see the bug report
@@ skipping 53 matching lines @@
   push(rcx);
 
   // Clear the top frame.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   movq(kScratchRegister, c_entry_fp_address);
   movq(Operand(kScratchRegister, 0), Immediate(0));
 }
 
 
 } }  // namespace v8::internal