1 /*
   2  * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.hotspot.amd64;
  24 
  25 import static jdk.vm.ci.amd64.AMD64.rdx;
  26 
  27 import org.graalvm.compiler.asm.amd64.AMD64Address;
  28 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  29 import org.graalvm.compiler.lir.LIRInstructionClass;
  30 import org.graalvm.compiler.lir.Opcode;
  31 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
  32 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  33 import org.graalvm.compiler.lir.framemap.FrameMap;
  34 
  35 import jdk.vm.ci.code.Register;
  36 import jdk.vm.ci.code.RegisterConfig;
  37 import jdk.vm.ci.code.RegisterSaveLayout;
  38 import jdk.vm.ci.meta.JavaKind;
  39 
  40 /**
  41  * Pops the current frame off the stack including the return address and restores the return
  42  * registers stored on the stack.
  43  */
  44 @Opcode("LEAVE_CURRENT_STACK_FRAME")
  45 final class AMD64HotSpotLeaveCurrentStackFrameOp extends AMD64HotSpotEpilogueOp {
  46 
  47     public static final LIRInstructionClass<AMD64HotSpotLeaveCurrentStackFrameOp> TYPE = LIRInstructionClass.create(AMD64HotSpotLeaveCurrentStackFrameOp.class);
  48 
  49     private final SaveRegistersOp saveRegisterOp;
  50 
  51     AMD64HotSpotLeaveCurrentStackFrameOp(SaveRegistersOp saveRegisterOp) {
  52         super(TYPE);
  53         this.saveRegisterOp = saveRegisterOp;
  54     }
  55 
  56     @Override
  57     public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  58         FrameMap frameMap = crb.frameMap;
  59         RegisterConfig registerConfig = frameMap.getRegisterConfig();
  60         RegisterSaveLayout registerSaveLayout = saveRegisterOp.getMap(frameMap);
  61         Register stackPointer = registerConfig.getFrameRegister();
  62 
  63         // Restore integer result register.
  64         final int stackSlotSize = frameMap.getTarget().wordSize;
  65         Register integerResultRegister = registerConfig.getReturnRegister(JavaKind.Long);
  66         masm.movptr(integerResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(integerResultRegister) * stackSlotSize));
  67         masm.movptr(rdx, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(rdx) * stackSlotSize));
  68 
  69         // Restore float result register.
  70         Register floatResultRegister = registerConfig.getReturnRegister(JavaKind.Double);
  71         masm.movdbl(floatResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(floatResultRegister) * stackSlotSize));
  72 
  73         /*
  74          * All of the register save area will be popped of the stack. Only the return address
  75          * remains.
  76          */
  77         leaveFrameAndRestoreRbp(crb, masm);
  78 
  79         // Remove return address.
  80         masm.addq(stackPointer, crb.target.arch.getReturnAddressSize());
  81     }
  82 }