001/*
002 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot.sparc;
024
025import jdk.internal.jvmci.code.*;
026import static com.oracle.graal.hotspot.HotSpotBackend.*;
027import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
028import static jdk.internal.jvmci.code.ValueUtil.*;
029import static jdk.internal.jvmci.sparc.SPARC.*;
030
031import com.oracle.graal.asm.sparc.*;
032import com.oracle.graal.compiler.common.spi.*;
033import com.oracle.graal.hotspot.stubs.*;
034import com.oracle.graal.lir.*;
035import com.oracle.graal.lir.asm.*;
036import com.oracle.graal.lir.sparc.*;
037
038/**
039 * Removes the current frame and jumps to the {@link UnwindExceptionToCallerStub}.
040 */
041@Opcode("UNWIND")
042final class SPARCHotSpotUnwindOp extends SPARCHotSpotEpilogueOp {
043    public static final LIRInstructionClass<SPARCHotSpotUnwindOp> TYPE = LIRInstructionClass.create(SPARCHotSpotUnwindOp.class);
044    public static final SizeEstimate SIZE = SizeEstimate.create(32);
045
046    @Use({REG}) protected RegisterValue exception;
047
048    SPARCHotSpotUnwindOp(RegisterValue exception) {
049        super(TYPE, SIZE);
050        this.exception = exception;
051    }
052
053    @Override
054    public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
055        // This Frame is left but the called unwind (which is sibling) method needs the exception as
056        // input in i0
057        masm.mov(o0, i0);
058        leaveFrame(crb);
059
060        ForeignCallLinkage linkage = crb.foreignCalls.lookupForeignCall(UNWIND_EXCEPTION_TO_CALLER);
061        CallingConvention cc = linkage.getOutgoingCallingConvention();
062        assert cc.getArgumentCount() == 2;
063        assert exception.equals(cc.getArgument(0));
064
065        // Get return address (is in o7 after leave).
066        Register returnAddress = asRegister(cc.getArgument(1));
067        masm.add(o7, SPARCAssembler.PC_RETURN_OFFSET, returnAddress);
068        Register scratch = g5;
069        SPARCCall.indirectJmp(crb, masm, scratch, linkage);
070    }
071}