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.hotspot.sparc;
  24 
  25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  26 import static jdk.vm.ci.code.ValueUtil.asRegister;
  27 import static jdk.vm.ci.sparc.SPARC.i7;
  28 import static jdk.vm.ci.sparc.SPARCKind.XWORD;
  29 
  30 import org.graalvm.compiler.asm.sparc.SPARCAssembler;
  31 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  32 import org.graalvm.compiler.lir.LIRInstructionClass;
  33 import org.graalvm.compiler.lir.Opcode;
  34 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  35 import org.graalvm.compiler.lir.sparc.SPARCLIRInstruction;
  36 
  37 import jdk.vm.ci.code.Register;
  38 import jdk.vm.ci.meta.AllocatableValue;
  39 
  40 /**
  41  * Patch the return address of the current frame.
  42  */
  43 @Opcode("PATCH_RETURN")
  44 final class SPARCHotSpotPatchReturnAddressOp extends SPARCLIRInstruction {
  45     public static final LIRInstructionClass<SPARCHotSpotPatchReturnAddressOp> TYPE = LIRInstructionClass.create(SPARCHotSpotPatchReturnAddressOp.class);
  46     public static final SizeEstimate SIZE = SizeEstimate.create(1);
  47 
  48     @Use(REG) AllocatableValue address;
  49 
  50     SPARCHotSpotPatchReturnAddressOp(AllocatableValue address) {
  51         super(TYPE, SIZE);
  52         this.address = address;
  53     }
  54 
  55     @Override
  56     public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
  57         Register addrRegister = asRegister(address, XWORD);
  58         masm.sub(addrRegister, SPARCAssembler.PC_RETURN_OFFSET, i7);
  59     }
  60 }