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.lir.sparc;
024
025import jdk.internal.jvmci.meta.*;
026import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
027
028import com.oracle.graal.asm.sparc.*;
029import com.oracle.graal.lir.*;
030import com.oracle.graal.lir.asm.*;
031
032/**
033 * Emits a breakpoint.
034 */
035@Opcode("BREAKPOINT")
036public final class SPARCBreakpointOp extends SPARCLIRInstruction {
037    public static final LIRInstructionClass<SPARCBreakpointOp> TYPE = LIRInstructionClass.create(SPARCBreakpointOp.class);
038    public static final SizeEstimate SIZE = SizeEstimate.create(1);
039
040    // historical - from hotspot src/cpu/sparc/vm
041    // <sys/trap.h> promises that the system will not use traps 16-31
042    // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
043    public static final int ST_RESERVED_FOR_USER_0 = 0x10;
044
045    /**
046     * A set of values loaded into the Java ABI parameter locations (for inspection by a debugger).
047     */
048    @Use({REG, STACK}) protected Value[] parameters;
049
050    public SPARCBreakpointOp(Value[] parameters) {
051        super(TYPE, SIZE);
052        this.parameters = parameters;
053    }
054
055    @Override
056    public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
057        masm.ta(ST_RESERVED_FOR_USER_0);
058    }
059}