1 /*
   2  * Copyright (c) 2012, 2014, 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 org.graalvm.compiler.hotspot.HotSpotBackend.UNWIND_EXCEPTION_TO_CALLER;
  26 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  27 import static jdk.vm.ci.amd64.AMD64.rsp;
  28 import static jdk.vm.ci.code.ValueUtil.asRegister;
  29 
  30 import org.graalvm.compiler.asm.amd64.AMD64Address;
  31 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  32 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
  33 import org.graalvm.compiler.hotspot.stubs.UnwindExceptionToCallerStub;
  34 import org.graalvm.compiler.lir.LIRInstructionClass;
  35 import org.graalvm.compiler.lir.Opcode;
  36 import org.graalvm.compiler.lir.amd64.AMD64Call;
  37 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  38 
  39 import jdk.vm.ci.code.CallingConvention;
  40 import jdk.vm.ci.code.Register;
  41 import jdk.vm.ci.code.RegisterValue;
  42 
  43 /**
  44  * Removes the current frame and jumps to the {@link UnwindExceptionToCallerStub}.
  45  */
  46 @Opcode("UNWIND")
  47 final class AMD64HotSpotUnwindOp extends AMD64HotSpotEpilogueBlockEndOp {
  48     public static final LIRInstructionClass<AMD64HotSpotUnwindOp> TYPE = LIRInstructionClass.create(AMD64HotSpotUnwindOp.class);
  49 
  50     @Use({REG}) protected RegisterValue exception;
  51 
  52     AMD64HotSpotUnwindOp(RegisterValue exception) {
  53         super(TYPE);
  54         this.exception = exception;
  55     }
  56 
  57     @Override
  58     public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  59         leaveFrameAndRestoreRbp(crb, masm);
  60 
  61         ForeignCallLinkage linkage = crb.foreignCalls.lookupForeignCall(UNWIND_EXCEPTION_TO_CALLER);
  62         CallingConvention cc = linkage.getOutgoingCallingConvention();
  63         assert cc.getArgumentCount() == 2;
  64         assert exception.equals(cc.getArgument(0));
  65 
  66         // Get return address (is on top of stack after leave).
  67         Register returnAddress = asRegister(cc.getArgument(1));
  68         masm.movq(returnAddress, new AMD64Address(rsp, 0));
  69 
  70         AMD64Call.directJmp(crb, masm, linkage);
  71     }
  72 }