| /* |
| * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.hotspot.aarch64; |
| |
| import static jdk.vm.ci.aarch64.AArch64.zr; |
| import static jdk.vm.ci.code.ValueUtil.asRegister; |
| |
| import org.graalvm.compiler.asm.NumUtil; |
| import org.graalvm.compiler.asm.aarch64.AArch64Address; |
| import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler; |
| import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; |
| import org.graalvm.compiler.lir.LIRFrameState; |
| import org.graalvm.compiler.lir.LIRInstructionClass; |
| import org.graalvm.compiler.lir.Opcode; |
| import org.graalvm.compiler.lir.aarch64.AArch64LIRInstruction; |
| import org.graalvm.compiler.lir.asm.CompilationResultBuilder; |
| |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.code.site.InfopointReason; |
| import jdk.vm.ci.meta.AllocatableValue; |
| |
| /** |
| * Emits a safepoint poll. |
| */ |
| @Opcode("SAFEPOINT") |
| public class AArch64HotSpotSafepointOp extends AArch64LIRInstruction { |
| public static final LIRInstructionClass<AArch64HotSpotSafepointOp> TYPE = LIRInstructionClass.create(AArch64HotSpotSafepointOp.class); |
| |
| @State protected LIRFrameState state; |
| @Temp protected AllocatableValue scratchValue; |
| |
| private final GraalHotSpotVMConfig config; |
| |
| public AArch64HotSpotSafepointOp(LIRFrameState state, GraalHotSpotVMConfig config, AllocatableValue scratch) { |
| super(TYPE); |
| this.state = state; |
| this.config = config; |
| this.scratchValue = scratch; |
| } |
| |
| @Override |
| public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { |
| Register scratch = asRegister(scratchValue); |
| emitCode(crb, masm, config, false, scratch, state); |
| } |
| |
| /** |
| * Conservatively checks whether we can load the safepoint polling address with a single ldr |
| * instruction or not. |
| * |
| * @return true if it is guaranteed that polling page offset will always fit into a 21-bit |
| * signed integer, false otherwise. |
| */ |
| private static boolean isPollingPageFar(GraalHotSpotVMConfig config) { |
| final long pollingPageAddress = config.safepointPollingAddress; |
| return !NumUtil.isSignedNbit(21, pollingPageAddress - config.codeCacheLowBound) || !NumUtil.isSignedNbit(21, pollingPageAddress - config.codeCacheHighBound); |
| } |
| |
| public static void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm, GraalHotSpotVMConfig config, boolean onReturn, Register scratch, LIRFrameState state) { |
| int pos = masm.position(); |
| if (isPollingPageFar(config)) { |
| crb.recordMark(onReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR); |
| masm.movNativeAddress(scratch, config.safepointPollingAddress); |
| if (state != null) { |
| crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT); |
| } |
| masm.ldr(32, zr, AArch64Address.createBaseRegisterOnlyAddress(scratch)); |
| } else { |
| crb.recordMark(onReturn ? config.MARKID_POLL_RETURN_NEAR : config.MARKID_POLL_NEAR); |
| if (state != null) { |
| crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT); |
| } |
| masm.ldr(32, zr, AArch64Address.createPcLiteralAddress(0)); |
| } |
| } |
| |
| } |