src/cpu/aarch64/vm/c1_Runtime1_aarch64.cpp

rev 8300 : 8079564: Use FP register as proper frame pointer in JIT compiled code on aarch64
Summary: Add support for PreserveFramePointer for debug/profile
Reviewed-by: duke

@@ -441,22 +441,12 @@
   case handle_exception_id:
     // Restore the registers that were saved at the beginning.
     restore_live_registers(sasm, id != handle_exception_nofpu_id);
     break;
   case handle_exception_from_callee_id:
-    // Pop the return address since we are possibly changing SP (restoring from BP).
+    // Pop the return address.
     __ leave();
-
-    // Restore SP from FP if the exception PC is a method handle call site.
-    {
-      Label nope;
-      __ ldrw(rscratch1, Address(rthread, JavaThread::is_method_handle_return_offset()));
-      __ cbzw(rscratch1, nope);
-      __ mov(sp, rfp);
-      __ bind(nope);
-    }
-
     __ ret(lr);  // jump to exception handler
     break;
   default:  ShouldNotReachHere();
   }
 

@@ -512,18 +502,10 @@
   __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
   __ mov(r3, lr);
 
   __ verify_not_null_oop(exception_oop);
 
-  {
-    Label foo;
-    __ ldrw(rscratch1, Address(rthread, JavaThread::is_method_handle_return_offset()));
-    __ cbzw(rscratch1, foo);
-    __ mov(sp, rfp);
-    __ bind(foo);
-  }
-
   // continue at exception handler (return address removed)
   // note: do *not* remove arguments when unwinding the
   //       activation since the caller assumes having
   //       all arguments on the stack when entering the
   //       runtime to determine the exception handler