--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9WriteDecoder.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.asm.sparc;
+
+import sun.jvm.hotspot.asm.*;
+
+class V9WriteDecoder extends InstructionDecoder
+              implements V9InstructionDecoder {
+    Instruction decode(int instruction, SPARCInstructionFactory factory) {
+        SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;
+        Instruction instr = null;
+        int specialRegNum = getDestinationRegister(instruction);
+
+        // rd values 1, 4,5 7-14 are reserved - see page 244, A.63 Write State Register.
+        if (specialRegNum == 1 || specialRegNum == 4 || specialRegNum == 5
+            || (specialRegNum > 6 && specialRegNum < 15)) {
+            instr = v9factory.newIllegalInstruction(instruction);
+        } else {
+            int rs1Num = getSourceRegister1(instruction);
+            if (specialRegNum == 15) {
+                if (isIBitSet(instruction) && rs1Num == 0) {
+                    instr = v9factory.newV9SirInstruction();
+                } else {
+                    instr = v9factory.newIllegalInstruction(instruction);
+                }
+            } else {
+                int asrRegNum = -1;
+                if (specialRegNum > 15) {
+                    asrRegNum = specialRegNum;
+                    specialRegNum = SPARCV9SpecialRegisters.ASR;
+                }
+                SPARCRegister rs1 = SPARCRegisters.getRegister(rs1Num);
+                instr = v9factory.newV9WriteInstruction(specialRegNum, asrRegNum, rs1, getOperand2(instruction));
+            }
+        }
+
+        return instr;
+    }
+}