1 /*
   2  * Copyright (c) 2012, 2018, 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.sparc;
  26 
  27 import static org.graalvm.compiler.hotspot.HotSpotBackend.UNWIND_EXCEPTION_TO_CALLER;
  28 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  29 import static jdk.vm.ci.code.ValueUtil.asRegister;
  30 import static jdk.vm.ci.sparc.SPARC.g5;
  31 import static jdk.vm.ci.sparc.SPARC.i0;
  32 import static jdk.vm.ci.sparc.SPARC.o0;
  33 import static jdk.vm.ci.sparc.SPARC.o7;
  34 
  35 import org.graalvm.compiler.asm.sparc.SPARCAssembler;
  36 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  37 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
  38 import org.graalvm.compiler.hotspot.stubs.UnwindExceptionToCallerStub;
  39 import org.graalvm.compiler.lir.LIRInstructionClass;
  40 import org.graalvm.compiler.lir.Opcode;
  41 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  42 import org.graalvm.compiler.lir.sparc.SPARCCall;
  43 
  44 import jdk.vm.ci.code.CallingConvention;
  45 import jdk.vm.ci.code.Register;
  46 import jdk.vm.ci.code.RegisterValue;
  47 
  48 /**
  49  * Removes the current frame and jumps to the {@link UnwindExceptionToCallerStub}.
  50  */
  51 @Opcode("UNWIND")
  52 final class SPARCHotSpotUnwindOp extends SPARCHotSpotEpilogueOp {
  53     public static final LIRInstructionClass<SPARCHotSpotUnwindOp> TYPE = LIRInstructionClass.create(SPARCHotSpotUnwindOp.class);
  54     public static final SizeEstimate SIZE = SizeEstimate.create(32);
  55 
  56     @Use({REG}) protected RegisterValue exception;
  57 
  58     SPARCHotSpotUnwindOp(RegisterValue exception) {
  59         super(TYPE, SIZE);
  60         this.exception = exception;
  61     }
  62 
  63     @Override
  64     public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
  65         // This Frame is left but the called unwind (which is sibling) method needs the exception as
  66         // input in i0
  67         masm.mov(o0, i0);
  68         leaveFrame(crb);
  69 
  70         ForeignCallLinkage linkage = crb.foreignCalls.lookupForeignCall(UNWIND_EXCEPTION_TO_CALLER);
  71         CallingConvention cc = linkage.getOutgoingCallingConvention();
  72         assert cc.getArgumentCount() == 2;
  73         assert exception.equals(cc.getArgument(0));
  74 
  75         // Get return address (is in o7 after leave).
  76         Register returnAddress = asRegister(cc.getArgument(1));
  77         masm.add(o7, SPARCAssembler.PC_RETURN_OFFSET, returnAddress);
  78         Register scratch = g5;
  79         SPARCCall.indirectJmp(crb, masm, scratch, linkage);
  80     }
  81 }