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1 /*
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2 * Copyright 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.win32;
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26
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27 import java.io.Serializable;
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28
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29 /** Describes an LDT entry. (Some of the descriptions are taken
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30 directly from Microsoft's documentation and are copyrighted by
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31 Microsoft.) */
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32
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33 class Win32LDTEntry implements Serializable {
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34 private short limitLow;
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35 private short baseLow;
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36 private byte baseMid;
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37 private byte flags1;
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38 private byte flags2;
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39 private byte baseHi;
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40
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41 private Win32LDTEntry() {}
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42
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43 public Win32LDTEntry(short limitLow,
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44 short baseLow,
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45 byte baseMid,
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46 byte flags1,
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47 byte flags2,
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48 byte baseHi) {
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49 this.limitLow = limitLow;
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50 this.baseLow = baseLow;
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51 this.baseMid = baseMid;
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52 this.flags1 = flags1;
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53 this.flags2 = flags2;
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54 this.baseHi = baseHi;
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55 }
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56
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57 /** Returns base address of segment */
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58 public long getBase() { return ( (baseLow & 0xFFFF) |
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59 ((baseMid & 0xFF) << 16) |
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60 ((baseHi & 0xFF) << 24)) & 0xFFFFFFFF; }
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61
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62 public short getLimitLow() { return limitLow; }
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63 public short getBaseLow() { return baseLow; }
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64 public byte getBaseMid() { return baseMid; }
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65 public byte getBaseHi() { return baseHi; }
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66
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67 // FIXME: must verify mask and shift are correct
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68 /** Describes type of segment. See TYPE_ portion of {@link
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69 sun.jvm.hotspot.debugger.win32.Win32LDTEntryConstants}. */
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70 public int getType() { return (flags1 & 0x1F); }
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71
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72 // FIXME: verify mask and shift are correct
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73 /** Privilege level of descriptor: 0 = most privileged, 3 = least privileged */
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74 public int getPrivilegeLevel() { return ((flags1 & 0x60) >> 5); }
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75
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76 // FIXME: verify mask is correct
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77 /** Is segment present in physical memory? */
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78 public boolean isSegmentPhysical() { return ((flags1 & 0x70) != 0); }
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79
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80 // FIXME: verify mask and shift are correct
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81 /** High bits (16-19) of the address of the last byte of the segment */
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82 public int getLimitHi() { return (flags2 & 0x0F); }
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83
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84 // FIXME: verify mask is correct
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85 /** <P> Size of segment. If the segment is a data segment, this
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86 member contains 1 if the segment is larger than 64 kilobytes (K)
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87 or 0 if the segment is smaller than or equal to 64K. </P>
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88
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89 <P> If the segment is a code segment, this member contains 1 if
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90 the segment is a code segment and runs with the default (native
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91 mode) instruction set. This member contains 0 if the code
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92 segment is an 80286 code segment and runs with 16-bit offsets
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93 and the 80286-compatible instruction set. </P> */
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94 public boolean isDefaultBig() { return ((flags2 & 0x40) != 0); }
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95
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96 // FIXME: verify mask is correct
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97 /** Returns true if segment is page granular, false if byte
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98 granular. */
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99 public boolean isPageGranular() { return ((flags2 & 0x80) != 0); }
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100 }
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