1 /*
   2  * Copyright (c) 2003, 2020, 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.linux;
  27 
  28 import java.io.*;
  29 import java.util.*;
  30 
  31 import sun.jvm.hotspot.debugger.*;
  32 import sun.jvm.hotspot.debugger.cdbg.*;
  33 import sun.jvm.hotspot.debugger.x86.*;
  34 import sun.jvm.hotspot.debugger.amd64.*;
  35 import sun.jvm.hotspot.debugger.aarch64.*;
  36 import sun.jvm.hotspot.debugger.ppc64.*;
  37 import sun.jvm.hotspot.debugger.linux.x86.*;
  38 import sun.jvm.hotspot.debugger.linux.amd64.*;
  39 import sun.jvm.hotspot.debugger.linux.ppc64.*;
  40 import sun.jvm.hotspot.debugger.linux.aarch64.*;
  41 import sun.jvm.hotspot.utilities.*;
  42 
  43 class LinuxCDebugger implements CDebugger {
  44   private LinuxDebugger dbg;
  45 
  46   LinuxCDebugger(LinuxDebugger dbg) {
  47     this.dbg = dbg;
  48   }
  49 
  50   public List<ThreadProxy> getThreadList() throws DebuggerException {
  51     return dbg.getThreadList();
  52   }
  53 
  54   public List<LoadObject> getLoadObjectList() throws DebuggerException {
  55     return dbg.getLoadObjectList();
  56   }
  57 
  58   public LoadObject loadObjectContainingPC(Address pc) throws DebuggerException {
  59     if (pc == null) {
  60       return null;
  61     }
  62 
  63     /* Typically we have about ten loaded objects here. So no reason to do
  64       sort/binary search here. Linear search gives us acceptable performance.*/
  65 
  66     List<LoadObject> objs = getLoadObjectList();
  67 
  68     for (int i = 0; i < objs.size(); i++) {
  69       LoadObject ob = (LoadObject) objs.get(i);
  70       Address base = ob.getBase();
  71       long size = ob.getSize();
  72       if ( pc.greaterThanOrEqual(base) && pc.lessThan(base.addOffsetTo(size))) {
  73         return ob;
  74       }
  75     }
  76 
  77     return null;
  78   }
  79 
  80   public CFrame topFrameForThread(ThreadProxy thread) throws DebuggerException {
  81     String cpu = dbg.getCPU();
  82     if (cpu.equals("x86")) {
  83        X86ThreadContext context = (X86ThreadContext) thread.getContext();
  84        Address ebp = context.getRegisterAsAddress(X86ThreadContext.EBP);
  85        if (ebp == null) return null;
  86        Address pc  = context.getRegisterAsAddress(X86ThreadContext.EIP);
  87        if (pc == null) return null;
  88        return new LinuxX86CFrame(dbg, ebp, pc);
  89     } else if (cpu.equals("amd64")) {
  90        AMD64ThreadContext context = (AMD64ThreadContext) thread.getContext();
  91        Address pc  = context.getRegisterAsAddress(AMD64ThreadContext.RIP);
  92        if (pc == null) return null;
  93        return LinuxAMD64CFrame.getTopFrame(dbg, pc, context);
  94     }  else if (cpu.equals("ppc64")) {
  95         PPC64ThreadContext context = (PPC64ThreadContext) thread.getContext();
  96         Address sp = context.getRegisterAsAddress(PPC64ThreadContext.SP);
  97         if (sp == null) return null;
  98         Address pc  = context.getRegisterAsAddress(PPC64ThreadContext.PC);
  99         if (pc == null) return null;
 100         return new LinuxPPC64CFrame(dbg, sp, pc, LinuxDebuggerLocal.getAddressSize());
 101     } else if (cpu.equals("aarch64")) {
 102        AARCH64ThreadContext context = (AARCH64ThreadContext) thread.getContext();
 103        Address fp = context.getRegisterAsAddress(AARCH64ThreadContext.FP);
 104        if (fp == null) return null;
 105        Address pc  = context.getRegisterAsAddress(AARCH64ThreadContext.PC);
 106        if (pc == null) return null;
 107        return new LinuxAARCH64CFrame(dbg, fp, pc);
 108      } else {
 109        // Runtime exception thrown by LinuxThreadContextFactory if unknown cpu
 110        ThreadContext context = (ThreadContext) thread.getContext();
 111        return context.getTopFrame(dbg);
 112     }
 113   }
 114 
 115   public String getNameOfFile(String fileName) {
 116     return new File(fileName).getName();
 117   }
 118 
 119   public ProcessControl getProcessControl() throws DebuggerException {
 120     // FIXME: after stabs parser
 121     return null;
 122   }
 123 
 124   public boolean canDemangle() {
 125     return true;
 126   }
 127 
 128   public String demangle(String sym) {
 129     return dbg.demangle(sym);
 130   }
 131 }