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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger.x86;
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26
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27 import sun.jvm.hotspot.debugger.*;
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28
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29 /** Specifies the thread context on x86 platforms; only a sub-portion
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30 of the context is guaranteed to be present on all operating
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31 systems. */
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32
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33 public abstract class X86ThreadContext implements ThreadContext {
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34 // Taken from /usr/include/ia32/sys/reg.h on Solaris/x86
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35
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36 // NOTE: the indices for the various registers must be maintained as
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37 // listed across various operating systems. However, only a small
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38 // subset of the registers' values are guaranteed to be present (and
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39 // must be present for the SA's stack walking to work): EAX, EBX,
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40 // ECX, EDX, ESI, EDI, EBP, ESP, and EIP.
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41
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42 public static final int GS = 0;
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43 public static final int FS = 1;
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44 public static final int ES = 2;
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45 public static final int DS = 3;
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46 public static final int EDI = 4;
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47 public static final int ESI = 5;
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48 public static final int EBP = 6;
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49 public static final int ESP = 7;
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50 public static final int EBX = 8;
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51 public static final int EDX = 9;
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52 public static final int ECX = 10;
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53 public static final int EAX = 11;
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54 public static final int TRAPNO = 12;
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55 public static final int ERR = 13;
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56 public static final int EIP = 14;
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57 public static final int CS = 15;
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58 public static final int EFL = 16;
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59 public static final int UESP = 17;
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60 public static final int SS = 18;
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61 // Additional state (not in reg.h) for debug registers
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62 public static final int DR0 = 19;
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63 public static final int DR1 = 20;
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64 public static final int DR2 = 21;
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65 public static final int DR3 = 22;
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66 public static final int DR6 = 23;
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67 public static final int DR7 = 24;
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68
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69
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70 public static final int PC = EIP;
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71 public static final int FP = EBP;
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72 public static final int SP = UESP;
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73 public static final int PS = EFL;
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74 public static final int R0 = EAX;
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75 public static final int R1 = EDX;
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76
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77 public static final int NPRGREG = 25;
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78
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79 private static final String[] regNames = {
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80 "GS", "FS", "ES", "DS",
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81 "EDI", "ESI", "EBP", "ESP",
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82 "EBX", "EDX", "ECX", "EAX",
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83 "TRAPNO", "ERR", "EIP", "CS",
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84 "EFLAGS", "UESP", "SS",
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85 "DR0", "DR1", "DR2", "DR3",
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86 "DR6", "DR7"
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87 };
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88
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89 // Ought to be int on x86 but we're stuck
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90 private long[] data;
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91
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92 public X86ThreadContext() {
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93 data = new long[NPRGREG];
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94 }
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95
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96 public int getNumRegisters() {
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97 return NPRGREG;
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98 }
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99
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100 public String getRegisterName(int index) {
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101 return regNames[index];
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102 }
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103
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104 public void setRegister(int index, long value) {
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105 data[index] = value;
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106 }
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107
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108 public long getRegister(int index) {
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109 return data[index];
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110 }
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111
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112 /** This can't be implemented in this class since we would have to
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113 tie the implementation to, for example, the debugging system */
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114 public abstract void setRegisterAsAddress(int index, Address value);
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115
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116 /** This can't be implemented in this class since we would have to
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117 tie the implementation to, for example, the debugging system */
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118 public abstract Address getRegisterAsAddress(int index);
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119 }
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