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