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 jdk.vm.ci.sparc.SPARC.sp; 28 import static org.graalvm.compiler.hotspot.HotSpotHostBackend.ENABLE_STACK_RESERVED_ZONE; 29 import static org.graalvm.compiler.hotspot.HotSpotHostBackend.THROW_DELAYED_STACKOVERFLOW_ERROR; 30 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL; 31 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; 32 33 import org.graalvm.compiler.asm.Label; 34 import org.graalvm.compiler.asm.sparc.SPARCAddress; 35 import org.graalvm.compiler.asm.sparc.SPARCAssembler; 36 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler; 37 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister; 38 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage; 39 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 40 import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider; 41 import org.graalvm.compiler.lir.LIRInstructionClass; 42 import org.graalvm.compiler.lir.Opcode; 43 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 44 import org.graalvm.compiler.lir.sparc.SPARCCall; 45 import org.graalvm.compiler.lir.sparc.SPARCControlFlow.ReturnOp; 46 47 import jdk.vm.ci.code.CallingConvention; 48 import jdk.vm.ci.code.Register; 49 import jdk.vm.ci.code.RegisterValue; 50 import jdk.vm.ci.meta.Value; 51 52 /** 53 * Returns from a function. 54 */ 55 @Opcode("RETURN") 56 final class SPARCHotSpotReturnOp extends SPARCHotSpotEpilogueOp { 57 public static final LIRInstructionClass<SPARCHotSpotReturnOp> TYPE = LIRInstructionClass.create(SPARCHotSpotReturnOp.class); 58 public static final SizeEstimate SIZE = SizeEstimate.create(2); 59 60 @Use({REG, ILLEGAL}) protected Value value; 61 @Use({REG, ILLEGAL}) protected Value safepointPollAddress; 62 private final boolean requiresReservedStackAccessCheck; 63 private final boolean isStub; 64 private final GraalHotSpotVMConfig config; 65 private final Register thread; 66 67 SPARCHotSpotReturnOp(Value value, boolean isStub, GraalHotSpotVMConfig config, Register thread, Value safepointPoll, boolean requiresReservedStackAccessCheck) { 68 super(TYPE, SIZE); 69 this.value = value; 70 this.isStub = isStub; 71 this.config = config; 72 this.thread = thread; 73 this.safepointPollAddress = safepointPoll; 74 this.requiresReservedStackAccessCheck = requiresReservedStackAccessCheck; 75 } 76 77 @Override 78 public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) { 79 if (!isStub) { 80 if (requiresReservedStackAccessCheck) { 81 try (ScratchRegister sc = masm.getScratchRegister()) { 82 HotSpotForeignCallsProvider foreignCalls = (HotSpotForeignCallsProvider) crb.foreignCalls; 83 Label noReserved = new Label(); 84 Register scratch = sc.getRegister(); 85 masm.ldx(new SPARCAddress(thread, config.javaThreadReservedStackActivationOffset), scratch); 86 masm.compareBranch(sp, scratch, SPARCAssembler.ConditionFlag.LessUnsigned, SPARCAssembler.CC.Xcc, noReserved, SPARCAssembler.BranchPredict.PREDICT_TAKEN, null); 87 ForeignCallLinkage enableStackReservedZone = foreignCalls.lookupForeignCall(ENABLE_STACK_RESERVED_ZONE); 88 CallingConvention cc = enableStackReservedZone.getOutgoingCallingConvention(); 89 assert cc.getArgumentCount() == 1; 90 Register arg0 = ((RegisterValue) cc.getArgument(0)).getRegister(); 91 masm.mov(thread, arg0); 92 SPARCCall.directCall(crb, masm, enableStackReservedZone, scratch, null); 93 masm.restoreWindow(); 94 SPARCCall.indirectJmp(crb, masm, scratch, foreignCalls.lookupForeignCall(THROW_DELAYED_STACKOVERFLOW_ERROR)); 95 masm.bind(noReserved); 96 } 97 } 98 // Every non-stub compile method must have a poll before the return. 99 SPARCHotSpotSafepointOp.emitCode(crb, masm, config, true, null, thread, safepointPollAddress); 100 } 101 ReturnOp.emitCodeHelper(crb, masm); 102 } 103 }