1 /* 2 * Copyright (c) 2013, 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.aarch64; 26 27 import static jdk.vm.ci.aarch64.AArch64.sp; 28 import static jdk.vm.ci.code.ValueUtil.asRegister; 29 import static jdk.vm.ci.hotspot.aarch64.AArch64HotSpotRegisterConfig.fp; 30 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; 31 32 import org.graalvm.compiler.asm.Label; 33 import org.graalvm.compiler.asm.aarch64.AArch64Address; 34 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler; 35 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler.ScratchRegister; 36 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 37 import org.graalvm.compiler.lir.LIRInstructionClass; 38 import org.graalvm.compiler.lir.Opcode; 39 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 40 import org.graalvm.compiler.serviceprovider.JavaVersionUtil; 41 42 import jdk.vm.ci.code.Register; 43 import jdk.vm.ci.meta.AllocatableValue; 44 45 /** 46 * Sets up the arguments for an exception handler in the callers frame, removes the current frame 47 * and jumps to the handler. 48 */ 49 @Opcode("JUMP_TO_EXCEPTION_HANDLER_IN_CALLER") 50 public class AArch64HotSpotJumpToExceptionHandlerInCallerOp extends AArch64HotSpotEpilogueOp { 51 52 public static final LIRInstructionClass<AArch64HotSpotJumpToExceptionHandlerInCallerOp> TYPE = LIRInstructionClass.create(AArch64HotSpotJumpToExceptionHandlerInCallerOp.class); 53 54 @Use(REG) private AllocatableValue handlerInCallerPc; 55 @Use(REG) private AllocatableValue exception; 56 @Use(REG) private AllocatableValue exceptionPc; 57 private final Register thread; 58 private final int isMethodHandleReturnOffset; 59 60 public AArch64HotSpotJumpToExceptionHandlerInCallerOp(AllocatableValue handlerInCallerPc, AllocatableValue exception, AllocatableValue exceptionPc, int isMethodHandleReturnOffset, 61 Register thread, GraalHotSpotVMConfig config) { 62 super(TYPE, config); 63 this.handlerInCallerPc = handlerInCallerPc; 64 this.exception = exception; 65 this.exceptionPc = exceptionPc; 66 this.isMethodHandleReturnOffset = isMethodHandleReturnOffset; 67 this.thread = thread; 68 } 69 70 @Override 71 public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { 72 leaveFrame(crb, masm, /* emitSafepoint */false, false); 73 74 if (JavaVersionUtil.JAVA_SPEC < 8) { 75 // Restore sp from fp if the exception PC is a method handle call site. 76 try (ScratchRegister sc = masm.getScratchRegister()) { 77 Register scratch = sc.getRegister(); 78 final boolean allowOverwrite = false; 79 AArch64Address address = masm.makeAddress(thread, isMethodHandleReturnOffset, scratch, 4, allowOverwrite); 80 masm.ldr(32, scratch, address); 81 Label noRestore = new Label(); 82 masm.cbz(32, scratch, noRestore); 83 masm.mov(64, sp, fp); 84 masm.bind(noRestore); 85 } 86 } 87 88 masm.jmp(asRegister(handlerInCallerPc)); 89 } 90 }