1 /* 2 * Copyright (c) 2013, 2017, 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.aarch64; 26 27 import static jdk.vm.ci.aarch64.AArch64.lr; 28 import static jdk.vm.ci.aarch64.AArch64.sp; 29 import static jdk.vm.ci.aarch64.AArch64.zr; 30 import static jdk.vm.ci.hotspot.aarch64.AArch64HotSpotRegisterConfig.fp; 31 import static org.graalvm.compiler.hotspot.HotSpotHostBackend.ENABLE_STACK_RESERVED_ZONE; 32 import static org.graalvm.compiler.hotspot.HotSpotHostBackend.THROW_DELAYED_STACKOVERFLOW_ERROR; 33 34 import org.graalvm.compiler.asm.Label; 35 import org.graalvm.compiler.asm.aarch64.AArch64Address; 36 import org.graalvm.compiler.asm.aarch64.AArch64Assembler; 37 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler; 38 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler.ScratchRegister; 39 import org.graalvm.compiler.core.common.spi.ForeignCallLinkage; 40 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 41 import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider; 42 import org.graalvm.compiler.lir.LIRInstructionClass; 43 import org.graalvm.compiler.lir.aarch64.AArch64BlockEndOp; 44 import org.graalvm.compiler.lir.aarch64.AArch64Call; 45 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 46 47 import jdk.vm.ci.code.CallingConvention; 48 import jdk.vm.ci.code.Register; 49 import jdk.vm.ci.code.RegisterValue; 50 51 /** 52 * Superclass for operations that leave a method's frame. 53 */ 54 abstract class AArch64HotSpotEpilogueOp extends AArch64BlockEndOp { 55 56 private final GraalHotSpotVMConfig config; 57 private final Register thread; 58 59 protected AArch64HotSpotEpilogueOp(LIRInstructionClass<? extends AArch64HotSpotEpilogueOp> c, GraalHotSpotVMConfig config, Register thread) { 60 super(c); 61 this.config = config; 62 this.thread = thread; 63 } 64 65 protected AArch64HotSpotEpilogueOp(LIRInstructionClass<? extends AArch64HotSpotEpilogueOp> c, GraalHotSpotVMConfig config) { 66 super(c); 67 this.config = config; 68 this.thread = null; // no safepoint 69 } 70 71 protected void leaveFrame(CompilationResultBuilder crb, AArch64MacroAssembler masm, boolean emitSafepoint, boolean requiresReservedStackAccessCheck) { 72 assert crb.frameContext != null : "We never elide frames in aarch64"; 73 crb.frameContext.leave(crb); 74 if (requiresReservedStackAccessCheck) { 75 HotSpotForeignCallsProvider foreignCalls = (HotSpotForeignCallsProvider) crb.foreignCalls; 76 Label noReserved = new Label(); 77 try (ScratchRegister sc = masm.getScratchRegister()) { 78 Register scratch = sc.getRegister(); 79 masm.ldr(64, scratch, masm.makeAddress(thread, config.javaThreadReservedStackActivationOffset, 8)); 80 masm.subs(64, zr, sp, scratch); 81 } 82 masm.branchConditionally(AArch64Assembler.ConditionFlag.LO, noReserved); 83 ForeignCallLinkage enableStackReservedZone = foreignCalls.lookupForeignCall(ENABLE_STACK_RESERVED_ZONE); 84 CallingConvention cc = enableStackReservedZone.getOutgoingCallingConvention(); 85 assert cc.getArgumentCount() == 1; 86 Register arg0 = ((RegisterValue) cc.getArgument(0)).getRegister(); 87 masm.mov(64, arg0, thread); 88 try (ScratchRegister sc = masm.getScratchRegister()) { 89 masm.stp(64, fp, lr, AArch64Address.createPreIndexedImmediateAddress(sp, -2)); 90 AArch64Call.directCall(crb, masm, enableStackReservedZone, sc.getRegister(), null); 91 masm.ldp(64, fp, lr, AArch64Address.createPostIndexedImmediateAddress(sp, 2)); 92 } 93 AArch64Call.directJmp(crb, masm, foreignCalls.lookupForeignCall(THROW_DELAYED_STACKOVERFLOW_ERROR)); 94 masm.bind(noReserved); 95 } 96 if (emitSafepoint) { 97 try (ScratchRegister sc = masm.getScratchRegister()) { 98 Register scratch = sc.getRegister(); 99 AArch64HotSpotSafepointOp.emitCode(crb, masm, config, true, thread, scratch, null); 100 } 101 } 102 } 103 }