--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jvmci/jdk.vm.ci.hotspot.aarch64/src/jdk/vm/ci/hotspot/aarch64/AArch64HotSpotRegisterConfig.java	Thu Dec 24 09:50:27 2015 -1000
@@ -0,0 +1,298 @@
+/*
+ * Copyright (c) 2015, 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 jdk.vm.ci.hotspot.aarch64;
+
+import static jdk.vm.ci.aarch64.AArch64.lr;
+import static jdk.vm.ci.aarch64.AArch64.r0;
+import static jdk.vm.ci.aarch64.AArch64.r1;
+import static jdk.vm.ci.aarch64.AArch64.r12;
+import static jdk.vm.ci.aarch64.AArch64.r2;
+import static jdk.vm.ci.aarch64.AArch64.r27;
+import static jdk.vm.ci.aarch64.AArch64.r28;
+import static jdk.vm.ci.aarch64.AArch64.r29;
+import static jdk.vm.ci.aarch64.AArch64.r3;
+import static jdk.vm.ci.aarch64.AArch64.r4;
+import static jdk.vm.ci.aarch64.AArch64.r5;
+import static jdk.vm.ci.aarch64.AArch64.r6;
+import static jdk.vm.ci.aarch64.AArch64.r7;
+import static jdk.vm.ci.aarch64.AArch64.r9;
+import static jdk.vm.ci.aarch64.AArch64.sp;
+import static jdk.vm.ci.aarch64.AArch64.v0;
+import static jdk.vm.ci.aarch64.AArch64.v1;
+import static jdk.vm.ci.aarch64.AArch64.v2;
+import static jdk.vm.ci.aarch64.AArch64.v3;
+import static jdk.vm.ci.aarch64.AArch64.v4;
+import static jdk.vm.ci.aarch64.AArch64.v5;
+import static jdk.vm.ci.aarch64.AArch64.v6;
+import static jdk.vm.ci.aarch64.AArch64.v7;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import jdk.vm.ci.aarch64.AArch64;
+import jdk.vm.ci.code.Architecture;
+import jdk.vm.ci.code.CallingConvention;
+import jdk.vm.ci.code.CallingConvention.Type;
+import jdk.vm.ci.code.Register;
+import jdk.vm.ci.code.RegisterAttributes;
+import jdk.vm.ci.code.RegisterConfig;
+import jdk.vm.ci.code.StackSlot;
+import jdk.vm.ci.code.TargetDescription;
+import jdk.vm.ci.common.JVMCIError;
+import jdk.vm.ci.hotspot.HotSpotVMConfig;
+import jdk.vm.ci.meta.AllocatableValue;
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.JavaType;
+import jdk.vm.ci.meta.LIRKind;
+import jdk.vm.ci.meta.PlatformKind;
+import jdk.vm.ci.meta.Value;
+
+public class AArch64HotSpotRegisterConfig implements RegisterConfig {
+
+    private final Architecture architecture;
+
+    private final Register[] allocatable;
+
+    private final int maxFrameSize;
+
+    /**
+     * The caller saved registers always include all parameter registers.
+     */
+    private final Register[] callerSaved;
+
+    private final boolean allAllocatableAreCallerSaved;
+
+    private final RegisterAttributes[] attributesMap;
+
+    public int getMaximumFrameSize() {
+        return maxFrameSize;
+    }
+
+    @Override
+    public Register[] getAllocatableRegisters() {
+        return allocatable.clone();
+    }
+
+    public Register[] filterAllocatableRegisters(PlatformKind kind, Register[] registers) {
+        ArrayList<Register> list = new ArrayList<>();
+        for (Register reg : registers) {
+            if (architecture.canStoreValue(reg.getRegisterCategory(), kind)) {
+                list.add(reg);
+            }
+        }
+
+        Register[] ret = list.toArray(new Register[list.size()]);
+        return ret;
+    }
+
+    @Override
+    public RegisterAttributes[] getAttributesMap() {
+        return attributesMap.clone();
+    }
+
+    private final Register[] javaGeneralParameterRegisters = {r1, r2, r3, r4, r5, r6, r7, r0};
+    private final Register[] nativeGeneralParameterRegisters = {r0, r1, r2, r3, r4, r5, r6, r7};
+    private final Register[] simdParameterRegisters = {v0, v1, v2, v3, v4, v5, v6, v7};
+
+    public static final Register inlineCacheRegister = r9;
+
+    /**
+     * Vtable stubs expect the metaspace Method in r12.
+     */
+    public static final Register metaspaceMethodRegister = r12;
+
+    public static final Register heapBaseRegister = r27;
+    public static final Register threadRegister = r28;
+    public static final Register fp = r29;
+
+    private static Register[] initAllocatable(Architecture arch, boolean reserveForHeapBase) {
+        Register[] allRegisters = arch.getAvailableValueRegisters();
+        Register[] registers = new Register[allRegisters.length - (reserveForHeapBase ? 5 : 4)];
+
+        int idx = 0;
+        for (Register reg : allRegisters) {
+            if (reg.equals(threadRegister) || reg.equals(fp) || reg.equals(lr) || reg.equals(sp)) {
+                // skip thread register, frame pointer, link register and stack pointer
+                continue;
+            }
+            if (reserveForHeapBase && reg.equals(heapBaseRegister)) {
+                // skip heap base register
+                continue;
+            }
+
+            registers[idx++] = reg;
+        }
+
+        assert idx == registers.length;
+        return registers;
+    }
+
+    public AArch64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config) {
+        this(architecture, config, initAllocatable(architecture, config.useCompressedOops));
+        assert callerSaved.length >= allocatable.length;
+    }
+
+    public AArch64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config, Register[] allocatable) {
+        this.architecture = architecture;
+        this.maxFrameSize = config.maxFrameSize;
+
+        this.allocatable = allocatable.clone();
+        Set<Register> callerSaveSet = new HashSet<>();
+        Collections.addAll(callerSaveSet, allocatable);
+        Collections.addAll(callerSaveSet, simdParameterRegisters);
+        Collections.addAll(callerSaveSet, javaGeneralParameterRegisters);
+        Collections.addAll(callerSaveSet, nativeGeneralParameterRegisters);
+        callerSaved = callerSaveSet.toArray(new Register[callerSaveSet.size()]);
+
+        allAllocatableAreCallerSaved = true;
+        attributesMap = RegisterAttributes.createMap(this, AArch64.allRegisters);
+    }
+
+    @Override
+    public Register[] getCallerSaveRegisters() {
+        return callerSaved;
+    }
+
+    public Register[] getCalleeSaveRegisters() {
+        return null;
+    }
+
+    @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        return allAllocatableAreCallerSaved;
+    }
+
+    @Override
+    public Register getRegisterForRole(int index) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, TargetDescription target, boolean stackOnly) {
+        if (type == Type.NativeCall) {
+            return callingConvention(nativeGeneralParameterRegisters, returnType, parameterTypes, type, target, stackOnly);
+        }
+        // On x64, parameter locations are the same whether viewed
+        // from the caller or callee perspective
+        return callingConvention(javaGeneralParameterRegisters, returnType, parameterTypes, type, target, stackOnly);
+    }
+
+    public Register[] getCallingConventionRegisters(Type type, JavaKind kind) {
+        switch (kind) {
+            case Boolean:
+            case Byte:
+            case Short:
+            case Char:
+            case Int:
+            case Long:
+            case Object:
+                return type == Type.NativeCall ? nativeGeneralParameterRegisters : javaGeneralParameterRegisters;
+            case Float:
+            case Double:
+                return simdParameterRegisters;
+            default:
+                throw JVMCIError.shouldNotReachHere();
+        }
+    }
+
+    private CallingConvention callingConvention(Register[] generalParameterRegisters, JavaType returnType, JavaType[] parameterTypes, Type type, TargetDescription target, boolean stackOnly) {
+        AllocatableValue[] locations = new AllocatableValue[parameterTypes.length];
+
+        int currentGeneral = 0;
+        int currentSIMD = 0;
+        int currentStackOffset = 0;
+
+        for (int i = 0; i < parameterTypes.length; i++) {
+            final JavaKind kind = parameterTypes[i].getJavaKind().getStackKind();
+
+            switch (kind) {
+                case Byte:
+                case Boolean:
+                case Short:
+                case Char:
+                case Int:
+                case Long:
+                case Object:
+                    if (!stackOnly && currentGeneral < generalParameterRegisters.length) {
+                        Register register = generalParameterRegisters[currentGeneral++];
+                        locations[i] = register.asValue(target.getLIRKind(kind));
+                    }
+                    break;
+                case Float:
+                case Double:
+                    if (!stackOnly && currentSIMD < simdParameterRegisters.length) {
+                        Register register = simdParameterRegisters[currentSIMD++];
+                        locations[i] = register.asValue(target.getLIRKind(kind));
+                    }
+                    break;
+                default:
+                    throw JVMCIError.shouldNotReachHere();
+            }
+
+            if (locations[i] == null) {
+                LIRKind lirKind = target.getLIRKind(kind);
+                locations[i] = StackSlot.get(lirKind, currentStackOffset, !type.out);
+                currentStackOffset += Math.max(lirKind.getPlatformKind().getSizeInBytes(), target.wordSize);
+            }
+        }
+
+        JavaKind returnKind = returnType == null ? JavaKind.Void : returnType.getJavaKind();
+        AllocatableValue returnLocation = returnKind == JavaKind.Void ? Value.ILLEGAL : getReturnRegister(returnKind).asValue(target.getLIRKind(returnKind.getStackKind()));
+        return new CallingConvention(currentStackOffset, returnLocation, locations);
+    }
+
+    @Override
+    public Register getReturnRegister(JavaKind kind) {
+        switch (kind) {
+            case Boolean:
+            case Byte:
+            case Char:
+            case Short:
+            case Int:
+            case Long:
+            case Object:
+                return r0;
+            case Float:
+            case Double:
+                return v0;
+            case Void:
+            case Illegal:
+                return null;
+            default:
+                throw new UnsupportedOperationException("no return register for type " + kind);
+        }
+    }
+
+    @Override
+    public Register getFrameRegister() {
+        return sp;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("Allocatable: " + Arrays.toString(getAllocatableRegisters()) + "%n" + "CallerSave:  " + Arrays.toString(getCallerSaveRegisters()) + "%n");
+    }
+}