1 /*
   2  * Copyright (c) 2014, 2015, 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 package org.graalvm.compiler.hotspot.sparc;
  24 
  25 import static jdk.vm.ci.sparc.SPARC.g0;
  26 import static jdk.vm.ci.sparc.SPARC.i0;
  27 import static jdk.vm.ci.sparc.SPARC.l7;
  28 
  29 import org.graalvm.compiler.asm.sparc.SPARCAddress;
  30 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  31 import org.graalvm.compiler.hotspot.HotSpotBackend;
  32 import org.graalvm.compiler.lir.LIRInstructionClass;
  33 import org.graalvm.compiler.lir.Opcode;
  34 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  35 import org.graalvm.compiler.lir.sparc.SPARCLIRInstruction;
  36 import org.graalvm.compiler.lir.sparc.SPARCSaveRegistersOp;
  37 
  38 import jdk.vm.ci.code.Register;
  39 
  40 /**
  41  * Emits code that leaves a stack frame which is tailored to call the C++ method
  42  * {@link HotSpotBackend#UNPACK_FRAMES Deoptimization::unpack_frames}.
  43  */
  44 @Opcode("LEAVE_UNPACK_FRAMES_STACK_FRAME")
  45 final class SPARCHotSpotLeaveUnpackFramesStackFrameOp extends SPARCLIRInstruction {
  46     public static final LIRInstructionClass<SPARCHotSpotLeaveUnpackFramesStackFrameOp> TYPE = LIRInstructionClass.create(SPARCHotSpotLeaveUnpackFramesStackFrameOp.class);
  47 
  48     private final Register thread;
  49     private final int threadLastJavaSpOffset;
  50     private final int threadLastJavaPcOffset;
  51     private final int threadJavaFrameAnchorFlagsOffset;
  52 
  53     SPARCHotSpotLeaveUnpackFramesStackFrameOp(Register thread, int threadLastJavaSpOffset, int threadLastJavaPcOffset, int threadJavaFrameAnchorFlagsOffset) {
  54         super(TYPE);
  55         this.thread = thread;
  56         this.threadLastJavaSpOffset = threadLastJavaSpOffset;
  57         this.threadLastJavaPcOffset = threadLastJavaPcOffset;
  58         this.threadJavaFrameAnchorFlagsOffset = threadJavaFrameAnchorFlagsOffset;
  59     }
  60 
  61     @Override
  62     public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
  63         /*
  64          * Safe thread register manually since we are not using LEAF_SP for {@link
  65          * DeoptimizationStub#UNPACK_FRAMES}.
  66          */
  67         masm.mov(l7, thread);
  68 
  69         SPARCAddress lastJavaPc = new SPARCAddress(thread, threadLastJavaPcOffset);
  70 
  71         // We borrow the threads lastJavaPC to transfer the value from float to i0
  72         masm.stdf(SPARCSaveRegistersOp.RETURN_REGISTER_STORAGE, lastJavaPc);
  73         masm.ldx(lastJavaPc, i0);
  74 
  75         // Clear last Java frame values.
  76         masm.stx(g0, lastJavaPc);
  77         masm.stx(g0, new SPARCAddress(thread, threadLastJavaSpOffset));
  78         masm.stw(g0, new SPARCAddress(thread, threadJavaFrameAnchorFlagsOffset));
  79     }
  80 }