1 /*
   2  * Copyright (c) 2012, 2015, 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.lir.sparc;
  24 
  25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  26 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
  27 
  28 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  29 import org.graalvm.compiler.lir.LIRInstructionClass;
  30 import org.graalvm.compiler.lir.Opcode;
  31 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  32 
  33 import jdk.vm.ci.meta.Value;
  34 
  35 /**
  36  * Emits a breakpoint.
  37  */
  38 @Opcode("BREAKPOINT")
  39 public final class SPARCBreakpointOp extends SPARCLIRInstruction {
  40     public static final LIRInstructionClass<SPARCBreakpointOp> TYPE = LIRInstructionClass.create(SPARCBreakpointOp.class);
  41     public static final SizeEstimate SIZE = SizeEstimate.create(1);
  42 
  43     // historical - from hotspot src/cpu/sparc/vm
  44     // <sys/trap.h> promises that the system will not use traps 16-31
  45     // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
  46     public static final int ST_RESERVED_FOR_USER_0 = 0x10;
  47 
  48     /**
  49      * A set of values loaded into the Java ABI parameter locations (for inspection by a debugger).
  50      */
  51     @Use({REG, STACK}) protected Value[] parameters;
  52 
  53     public SPARCBreakpointOp(Value[] parameters) {
  54         super(TYPE, SIZE);
  55         this.parameters = parameters;
  56     }
  57 
  58     @Override
  59     public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
  60         masm.ta(ST_RESERVED_FOR_USER_0);
  61     }
  62 }