0
|
1 /*
|
|
2 * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or
|
|
21 * have any questions.
|
|
22 *
|
|
23 */
|
|
24
|
|
25 package sun.jvm.hotspot.asm.sparc;
|
|
26
|
|
27 import sun.jvm.hotspot.asm.*;
|
|
28
|
|
29 abstract class MemoryInstructionDecoder extends InstructionDecoder {
|
|
30 final int op3;
|
|
31 final String name;
|
|
32 final int dataType;
|
|
33
|
|
34 SPARCRegisterIndirectAddress newRegisterIndirectAddress(SPARCRegister rs1, SPARCRegister rs2) {
|
|
35 return new SPARCRegisterIndirectAddress(rs1, rs2);
|
|
36 }
|
|
37
|
|
38 SPARCRegisterIndirectAddress newRegisterIndirectAddress(SPARCRegister rs1, int offset) {
|
|
39 return new SPARCRegisterIndirectAddress(rs1, offset);
|
|
40 }
|
|
41
|
|
42 static void setAddressSpace(int instruction, SPARCRegisterIndirectAddress addr) {
|
|
43 int asi = (instruction & ASI_MASK) >>> ASI_START_BIT;
|
|
44 addr.setAddressSpace(asi);
|
|
45 }
|
|
46
|
|
47 SPARCRegisterIndirectAddress getRegisterIndirectAddress(int instruction) {
|
|
48 SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction));
|
|
49 boolean iBit = isIBitSet(instruction);
|
|
50 SPARCRegisterIndirectAddress addr = null;
|
|
51 if (iBit) {
|
|
52 int simm13 = extractSignedIntFromNBits(instruction, 13);
|
|
53 addr = newRegisterIndirectAddress(rs1,simm13);
|
|
54 } else {
|
|
55 SPARCRegister rs2 = SPARCRegisters.getRegister(getSourceRegister2(instruction));
|
|
56 addr = newRegisterIndirectAddress(rs1,rs2);
|
|
57 }
|
|
58 return addr;
|
|
59 }
|
|
60
|
|
61 MemoryInstructionDecoder(int op3, String name, int dataType) {
|
|
62 this.op3 = op3;
|
|
63 this.name = name;
|
|
64 this.dataType = dataType;
|
|
65 }
|
|
66
|
|
67 Instruction decode(int instruction, SPARCInstructionFactory factory) {
|
|
68 SPARCRegisterIndirectAddress addr = getRegisterIndirectAddress(instruction);
|
|
69 SPARCRegister rd = getDestination(instruction);
|
|
70 boolean isV9Okay = (factory instanceof SPARCV9InstructionFactory);
|
|
71 if ( (rd == null) || (! isV9Okay && rd.isV9Only()) )
|
|
72 return factory.newIllegalInstruction(instruction);
|
|
73
|
|
74 return decodeMemoryInstruction(instruction, addr, rd, factory);
|
|
75 }
|
|
76
|
|
77 SPARCRegister getDestination(int instruction) {
|
|
78 int rdNum = getDestinationRegister(instruction);
|
|
79 SPARCRegister rd = RegisterDecoder.decode(dataType, rdNum);
|
|
80 return rd;
|
|
81 }
|
|
82
|
|
83 abstract Instruction decodeMemoryInstruction(int instruction,
|
|
84 SPARCRegisterIndirectAddress addr,
|
|
85 SPARCRegister rd, SPARCInstructionFactory factory);
|
|
86 }
|