1 /*
   2  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2015, Red Hat Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 package sun.jvm.hotspot.debugger.aarch64;
  27 
  28 import sun.jvm.hotspot.debugger.*;
  29 import sun.jvm.hotspot.debugger.cdbg.*;
  30 
  31 /** Specifies the thread context on aarch64 platforms; only a sub-portion
  32  * of the context is guaranteed to be present on all operating
  33  * systems. */
  34 
  35 public abstract class AARCH64ThreadContext implements ThreadContext {
  36     // Taken from /usr/include/asm/sigcontext.h on Linux/AARCH64.
  37 
  38     // NOTE: the indices for the various registers must be maintained as
  39     // listed across various operating systems. However, only a small
  40     // subset of the registers' values are guaranteed to be present (and
  41     // must be present for the SA's stack walking to work)
  42 
  43     public static final int R0 = 0;
  44     public static final int R1 = 1;
  45     public static final int R2 = 2;
  46     public static final int R3 = 3;
  47     public static final int R4 = 4;
  48     public static final int R5 = 5;
  49     public static final int R6 = 6;
  50     public static final int R7 = 7;
  51     public static final int R8 = 8;
  52     public static final int R9 = 9;
  53     public static final int R10 = 10;
  54     public static final int R11 = 11;
  55     public static final int R12 = 12;
  56     public static final int R13 = 13;
  57     public static final int R14 = 14;
  58     public static final int R15 = 15;
  59     public static final int R16 = 16;
  60     public static final int R17 = 17;
  61     public static final int R18 = 18;
  62     public static final int R19 = 19;
  63     public static final int R20 = 20;
  64     public static final int R21 = 21;
  65     public static final int R22 = 22;
  66     public static final int R23 = 23;
  67     public static final int R24 = 24;
  68     public static final int R25 = 25;
  69     public static final int R26 = 26;
  70     public static final int R27 = 27;
  71     public static final int R28 = 28;
  72     public static final int FP = 29;
  73     public static final int LR = 30;
  74     public static final int SP = 31;
  75     public static final int PC = 32;
  76 
  77     public static final int NPRGREG = 33;
  78 
  79     private long[] data;
  80 
  81     public AARCH64ThreadContext() {
  82         data = new long[NPRGREG];
  83     }
  84 
  85     public int getNumRegisters() {
  86         return NPRGREG;
  87     }
  88 
  89     public String getRegisterName(int index) {
  90         switch (index) {
  91         case LR: return "lr";
  92         case SP: return "sp";
  93         case PC: return "pc";
  94         default:
  95             return "r" + index;
  96         }
  97     }
  98 
  99     public void setRegister(int index, long value) {
 100         data[index] = value;
 101     }
 102 
 103     public long getRegister(int index) {
 104         return data[index];
 105     }
 106 
 107     public CFrame getTopFrame(Debugger dbg) {
 108         return null;
 109     }
 110 
 111     /** This can't be implemented in this class since we would have to
 112      * tie the implementation to, for example, the debugging system */
 113     public abstract void setRegisterAsAddress(int index, Address value);
 114 
 115     /** This can't be implemented in this class since we would have to
 116      * tie the implementation to, for example, the debugging system */
 117     public abstract Address getRegisterAsAddress(int index);
 118 }