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view agent/src/share/classes/sun/jvm/hotspot/debugger/win32/Win32LDTEntry.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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/* * Copyright 2001 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.debugger.win32; import java.io.Serializable; /** Describes an LDT entry. (Some of the descriptions are taken directly from Microsoft's documentation and are copyrighted by Microsoft.) */ class Win32LDTEntry implements Serializable { private short limitLow; private short baseLow; private byte baseMid; private byte flags1; private byte flags2; private byte baseHi; private Win32LDTEntry() {} public Win32LDTEntry(short limitLow, short baseLow, byte baseMid, byte flags1, byte flags2, byte baseHi) { this.limitLow = limitLow; this.baseLow = baseLow; this.baseMid = baseMid; this.flags1 = flags1; this.flags2 = flags2; this.baseHi = baseHi; } /** Returns base address of segment */ public long getBase() { return ( (baseLow & 0xFFFF) | ((baseMid & 0xFF) << 16) | ((baseHi & 0xFF) << 24)) & 0xFFFFFFFF; } public short getLimitLow() { return limitLow; } public short getBaseLow() { return baseLow; } public byte getBaseMid() { return baseMid; } public byte getBaseHi() { return baseHi; } // FIXME: must verify mask and shift are correct /** Describes type of segment. See TYPE_ portion of {@link sun.jvm.hotspot.debugger.win32.Win32LDTEntryConstants}. */ public int getType() { return (flags1 & 0x1F); } // FIXME: verify mask and shift are correct /** Privilege level of descriptor: 0 = most privileged, 3 = least privileged */ public int getPrivilegeLevel() { return ((flags1 & 0x60) >> 5); } // FIXME: verify mask is correct /** Is segment present in physical memory? */ public boolean isSegmentPhysical() { return ((flags1 & 0x70) != 0); } // FIXME: verify mask and shift are correct /** High bits (16-19) of the address of the last byte of the segment */ public int getLimitHi() { return (flags2 & 0x0F); } // FIXME: verify mask is correct /** <P> Size of segment. If the segment is a data segment, this member contains 1 if the segment is larger than 64 kilobytes (K) or 0 if the segment is smaller than or equal to 64K. </P> <P> If the segment is a code segment, this member contains 1 if the segment is a code segment and runs with the default (native mode) instruction set. This member contains 0 if the code segment is an 80286 code segment and runs with 16-bit offsets and the 80286-compatible instruction set. </P> */ public boolean isDefaultBig() { return ((flags2 & 0x40) != 0); } // FIXME: verify mask is correct /** Returns true if segment is page granular, false if byte granular. */ public boolean isPageGranular() { return ((flags2 & 0x80) != 0); } }