1 /*
   2  * Copyright (c) 2013, 2016, 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 
  24 
  25 package org.graalvm.compiler.hotspot.aarch64;
  26 
  27 import static jdk.vm.ci.aarch64.AArch64.lr;
  28 import static jdk.vm.ci.code.ValueUtil.asRegister;
  29 import static org.graalvm.compiler.hotspot.HotSpotBackend.UNWIND_EXCEPTION_TO_CALLER;
  30 
  31 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
  32 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
  33 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
  34 import org.graalvm.compiler.hotspot.stubs.UnwindExceptionToCallerStub;
  35 import org.graalvm.compiler.lir.LIRInstructionClass;
  36 import org.graalvm.compiler.lir.Opcode;
  37 import org.graalvm.compiler.lir.aarch64.AArch64Call;
  38 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  39 
  40 import jdk.vm.ci.code.CallingConvention;
  41 import jdk.vm.ci.code.Register;
  42 import jdk.vm.ci.code.RegisterValue;
  43 
  44 /**
  45  * Removes the current frame and jumps to the {@link UnwindExceptionToCallerStub}.
  46  */
  47 @Opcode("UNWIND")
  48 public final class AArch64HotSpotUnwindOp extends AArch64HotSpotEpilogueOp {
  49     public static final LIRInstructionClass<AArch64HotSpotUnwindOp> TYPE = LIRInstructionClass.create(AArch64HotSpotUnwindOp.class);
  50 
  51     @Use protected RegisterValue exception;
  52 
  53     public AArch64HotSpotUnwindOp(GraalHotSpotVMConfig config, RegisterValue exception) {
  54         super(TYPE, config);
  55         this.exception = exception;
  56     }
  57 
  58     @Override
  59     public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
  60         leaveFrame(crb, masm, /* emitSafepoint */false, false);
  61 
  62         ForeignCallLinkage linkage = crb.foreignCalls.lookupForeignCall(UNWIND_EXCEPTION_TO_CALLER);
  63         CallingConvention cc = linkage.getOutgoingCallingConvention();
  64         assert cc.getArgumentCount() == 2;
  65         assert exception.equals(cc.getArgument(0));
  66 
  67         // Get return address (is in lr after frame leave)
  68         Register returnAddress = asRegister(cc.getArgument(1));
  69         masm.movx(returnAddress, lr);
  70 
  71         AArch64Call.directJmp(crb, masm, linkage);
  72     }
  73 }