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 }