src/arch/x86/stacktrace.cc

   1 /*
   2  * Copyright (c) 2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  */
  30
  31 #include <string>
  32
  33 #include "arch/x86/isa_traits.hh"
  34 #include "arch/x86/stacktrace.hh"
  35 #include "arch/x86/vtophys.hh"
  36 #include "base/bitfield.hh"
  37 #include "base/trace.hh"
  38 #include "cpu/base.hh"
  39 #include "cpu/thread_context.hh"
  40 #include "sim/system.hh"
  41
  42 using namespace std;
  43 namespace X86ISA
  44 {
  45     ProcessInfo::ProcessInfo(ThreadContext *_tc)
  46         : tc(_tc)
  47     {
  48         Addr addr = 0;
  49
  50         VirtualPort *vp;
  51
  52         vp = tc->getVirtPort();
  53
  54         if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_size", addr))
  55             panic("thread info not compiled into kernel\n");
  56         thread_info_size = vp->readGtoH<int32_t>(addr);
  57
  58         if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_size", addr))
  59             panic("thread info not compiled into kernel\n");
  60         task_struct_size = vp->readGtoH<int32_t>(addr);
  61
  62         if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_task", addr))
  63             panic("thread info not compiled into kernel\n");
  64         task_off = vp->readGtoH<int32_t>(addr);
  65
  66         if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_pid", addr))
  67             panic("thread info not compiled into kernel\n");
  68         pid_off = vp->readGtoH<int32_t>(addr);
  69
  70         if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_comm", addr))
  71             panic("thread info not compiled into kernel\n");
  72         name_off = vp->readGtoH<int32_t>(addr);
  73
  74         tc->delVirtPort(vp);
  75     }
  76
  77     Addr
  78     ProcessInfo::task(Addr ksp) const
  79     {
  80         Addr base = ksp & ~0x3fff;
  81         if (base == ULL(0xfffffc0000000000))
  82             return 0;
  83
  84         Addr tsk;
  85
  86         VirtualPort *vp;
  87
  88         vp = tc->getVirtPort();
  89         tsk = vp->readGtoH<Addr>(base + task_off);
  90         tc->delVirtPort(vp);
  91
  92         return tsk;
  93     }
  94
  95     int
  96     ProcessInfo::pid(Addr ksp) const
  97     {
  98         Addr task = this->task(ksp);
  99         if (!task)
 100             return -1;
 101
 102         uint16_t pd;
 103
 104         VirtualPort *vp;
 105
 106         vp = tc->getVirtPort();
 107         pd = vp->readGtoH<uint16_t>(task + pid_off);
 108         tc->delVirtPort(vp);
 109
 110         return pd;
 111     }
 112
 113     string
 114     ProcessInfo::name(Addr ksp) const
 115     {
 116         Addr task = this->task(ksp);
 117         if (!task)
 118             return "console";
 119
 120         char comm[256];
 121         CopyStringOut(tc, comm, task + name_off, sizeof(comm));
 122         if (!comm[0])
 123             return "startup";
 124
 125         return comm;
 126     }
 127
 128     StackTrace::StackTrace()
 129         : tc(0), stack(64)
 130     {
 131     }
 132
 133     StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
 134         : tc(0), stack(64)
 135     {
 136         trace(_tc, inst);
 137     }
 138
 139     StackTrace::~StackTrace()
 140     {
 141     }
 142
 143     void
 144     StackTrace::trace(ThreadContext *_tc, bool is_call)
 145     {
 146     }
 147
 148     bool
 149     StackTrace::isEntry(Addr addr)
 150     {
 151         return false;
 152     }
 153
 154     bool
 155     StackTrace::decodeStack(MachInst inst, int &disp)
 156     {
 157         return true;
 158     }
 159
 160     bool
 161     StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
 162     {
 163         return true;
 164     }
 165
 166     /*
 167      * Decode the function prologue for the function we're in, and note
 168      * which registers are stored where, and how large the stack frame is.
 169      */
 170     bool
 171     StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
 172                                int &size, Addr &ra)
 173     {
 174         size = 0;
 175         ra = 0;
 176
 177         for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
 178             MachInst inst;
 179             CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));
 180
 181             int reg, disp;
 182             if (decodeStack(inst, disp)) {
 183                 if (size) {
 184                     // panic("decoding frame size again");
 185                     return true;
 186                 }
 187                 size += disp;
 188             } else if (decodeSave(inst, reg, disp)) {
 189                 if (!ra && reg == ReturnAddressReg) {
 190                     CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
 191                     if (!ra) {
 192                         // panic("no return address value pc=%#x\n", pc);
 193                         return false;
 194                     }
 195                 }
 196             }
 197         }
 198
 199         return true;
 200     }
 201
 202 #if TRACING_ON
 203     void
 204     StackTrace::dump()
 205     {
 206         StringWrap name(tc->getCpuPtr()->name());
 207         SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
 208
 209         DPRINTFN("------ Stack ------\n");
 210
 211         string symbol;
 212         for (int i = 0, size = stack.size(); i < size; ++i) {
 213             Addr addr = stack[size - i - 1];
 214             if (addr == user)
 215                 symbol = "user";
 216             else if (addr == console)
 217                 symbol = "console";
 218             else if (addr == unknown)
 219                 symbol = "unknown";
 220             else
 221                 symtab->findSymbol(addr, symbol);
 222
 223             DPRINTFN("%#x: %s\n", addr, symbol);
 224         }
 225     }
 226 #endif
 227 }