1 /*
   2  * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2018, Red Hat Inc. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 
  25 
  26 package org.graalvm.compiler.hotspot.aarch64;
  27 
  28 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  29 import static jdk.vm.ci.aarch64.AArch64.sp;
  30 import static jdk.vm.ci.code.ValueUtil.asRegister;
  31 
  32 import org.graalvm.compiler.asm.Label;
  33 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
  34 import org.graalvm.compiler.lir.LIRInstructionClass;
  35 import org.graalvm.compiler.lir.Opcode;
  36 import org.graalvm.compiler.lir.aarch64.AArch64LIRInstruction;
  37 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  38 
  39 import jdk.vm.ci.code.Register;
  40 import jdk.vm.ci.meta.AllocatableValue;
  41 
  42 @Opcode("CRUNTIME_CALL_PROLOGUE")
  43 public class AArch64HotSpotCRuntimeCallPrologueOp extends AArch64LIRInstruction {
  44     public static final LIRInstructionClass<AArch64HotSpotCRuntimeCallPrologueOp> TYPE = LIRInstructionClass.create(AArch64HotSpotCRuntimeCallPrologueOp.class);
  45 
  46     private final int threadLastJavaSpOffset;
  47     private final int threadLastJavaPcOffset;
  48     private final Register thread;
  49     @Temp({REG}) protected AllocatableValue scratch;
  50     private final Label label;
  51 
  52     public AArch64HotSpotCRuntimeCallPrologueOp(int threadLastJavaSpOffset, int threadLastJavaPcOffset, Register thread, AllocatableValue scratch, Label label) {
  53         super(TYPE);
  54         this.threadLastJavaSpOffset = threadLastJavaSpOffset;
  55         this.threadLastJavaPcOffset = threadLastJavaPcOffset;
  56         this.thread = thread;
  57         this.scratch = scratch;
  58         this.label = label;
  59     }
  60 
  61     @Override
  62     public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
  63         // Save last Java frame.
  64         // We cannot save the SP directly so use a temporary register.
  65         Register scratchRegister = asRegister(scratch);
  66         masm.movx(scratchRegister, sp);
  67         masm.str(64, scratchRegister, masm.makeAddress(thread, threadLastJavaSpOffset, 8));
  68 
  69         // Get the current PC. Use a label to patch the return address.
  70         masm.adr(scratchRegister, label);
  71         masm.str(64, scratchRegister, masm.makeAddress(thread, threadLastJavaPcOffset, 8));
  72     }
  73 }