1 /*
2 * Copyright (c) 2001, 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,
20 * CA 94065 USA or visit www.oracle.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.asm.x86;
26
27 import sun.jvm.hotspot.utilities.*;
28
29 public class X86Registers {
30 public static final int NUM_REGISTERS = 8;
31
32 public static final X86Register EAX;
33 public static final X86Register ECX;
34 public static final X86Register EDX;
35 public static final X86Register EBX;
36 public static final X86Register ESP;
37 public static final X86Register EBP;
38 public static final X86Register ESI;
39 public static final X86Register EDI;
40
41 public static final X86Register AX;
42 public static final X86Register CX;
43 public static final X86Register DX;
44 public static final X86Register BX;
45 public static final X86Register SP;
46 public static final X86Register BP;
47 public static final X86Register SI;
48 public static final X86Register DI;
49
50 public static final X86Register AL;
51 public static final X86Register CL;
52 public static final X86Register DL;
53 public static final X86Register BL;
54 public static final X86Register AH;
55 public static final X86Register CH;
56 public static final X86Register DH;
57 public static final X86Register BH;
58
59 private static X86Register registers8[];
60 private static X86Register registers16[];
61 private static X86Register registers32[];
62
63 static {
64 EAX = new X86RegisterPart(0, "%eax", 0, 32);
65 ECX = new X86RegisterPart(1, "%ecx", 0, 32);
66 EDX = new X86RegisterPart(2, "%edx", 0, 32);
67 EBX = new X86RegisterPart(3, "%ebx", 0, 32);
68 ESP = new X86RegisterPart(4, "%esp", 0, 32);
69 EBP = new X86RegisterPart(5, "%ebp", 0, 32);
70 ESI = new X86RegisterPart(6, "%esi", 0, 32);
71 EDI = new X86RegisterPart(7, "%edi", 0, 32);
72
73 AX = new X86RegisterPart(0, "%ax", 0, 16);
74 CX = new X86RegisterPart(1, "%cx", 0, 16);
75 DX = new X86RegisterPart(2, "%dx", 0, 16);
76 BX = new X86RegisterPart(3, "%bx", 0, 16);
77 SP = new X86RegisterPart(4, "%sp", 0, 16);
78 BP = new X86RegisterPart(5, "%bp", 0, 16);
79 SI = new X86RegisterPart(6, "%si", 0, 16);
80 DI = new X86RegisterPart(7, "%di", 0, 16);
81
82 AL = new X86RegisterPart(0, "%al", 0, 8);
83 CL = new X86RegisterPart(1, "%cl", 0, 8);
84 DL = new X86RegisterPart(2, "%dl", 0, 8);
85 BL = new X86RegisterPart(3, "%bl", 0, 8);
86 AH = new X86RegisterPart(0, "%ah", 8, 8);
87 CH = new X86RegisterPart(1, "%ch", 8, 8);
88 DH = new X86RegisterPart(2, "%dh", 8, 8);
89 BH = new X86RegisterPart(3, "%bh", 8, 8);
90
91 registers32 = (new X86Register[] {
92 EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI
93 });
94 registers16 = (new X86Register[] {
95 AX, CX, DX, BX, SP, BP, SI, DI
96 });
97 registers8 = (new X86Register[] {
98 AL, CL, DL, BL, AH, CH, DH, BH
99 });
100 }
101
102 public static int getNumberOfRegisters() {
103 return NUM_REGISTERS;
104 }
105
106 public static X86Register getRegister8(int regNum) {
107 if (Assert.ASSERTS_ENABLED) {
108 Assert.that(regNum > -1 && regNum < NUM_REGISTERS, "invalid integer register number!");
109 }
110 return registers8[regNum];
111 }
112
113 public static X86Register getRegister16(int regNum) {
114 if (Assert.ASSERTS_ENABLED) {
115 Assert.that(regNum > -1 && regNum < NUM_REGISTERS, "invalid integer register number!");
116 }
117 return registers16[regNum];
118 }
119
120 public static X86Register getRegister32(int regNum) {
121 if (Assert.ASSERTS_ENABLED) {
122 Assert.that(regNum > -1 && regNum < NUM_REGISTERS, "invalid integer register number!");
123 }
124 return registers32[regNum];
125 }
126
127 //Return the 32bit register name
128 public static String getRegisterName(int regNum) {
129 if (Assert.ASSERTS_ENABLED) {
130 Assert.that(regNum > -1 && regNum < NUM_REGISTERS, "invalid integer register number!");
131 }
132 return registers32[regNum].toString();
133 }
134 }