src/arch/alpha/stacktrace.hh

   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
  29 #ifndef __ARCH_ALPHA_STACKTRACE_HH__
  30 #define __ARCH_ALPHA_STACKTRACE_HH__
  31
  32 #include "base/trace.hh"
  33 #include "cpu/static_inst.hh"
  34
  35 class ExecContext;
  36 class StackTrace;
  37
  38 class ProcessInfo
  39 {
  40   private:
  41     ExecContext *xc;
  42
  43     int thread_info_size;
  44     int task_struct_size;
  45     int task_off;
  46     int pid_off;
  47     int name_off;
  48
  49   public:
  50     ProcessInfo(ExecContext *_xc);
  51
  52     Addr task(Addr ksp) const;
  53     int pid(Addr ksp) const;
  54     std::string name(Addr ksp) const;
  55 };
  56
  57 class StackTrace
  58 {
  59   protected:
  60     typedef TheISA::MachInst MachInst;
  61   private:
  62     ExecContext *xc;
  63     std::vector<Addr> stack;
  64
  65   private:
  66     bool isEntry(Addr addr);
  67     bool decodePrologue(Addr sp, Addr callpc, Addr func, int &size, Addr &ra);
  68     bool decodeSave(MachInst inst, int &reg, int &disp);
  69     bool decodeStack(MachInst inst, int &disp);
  70
  71     void trace(ExecContext *xc, bool is_call);
  72
  73   public:
  74     StackTrace();
  75     StackTrace(ExecContext *xc, StaticInstPtr inst);
  76     ~StackTrace();
  77
  78     void clear()
  79     {
  80         xc = 0;
  81         stack.clear();
  82     }
  83
  84     bool valid() const { return xc != NULL; }
  85     bool trace(ExecContext *xc, StaticInstPtr inst);
  86
  87   public:
  88     const std::vector<Addr> &getstack() const { return stack; }
  89
  90     static const int user = 1;
  91     static const int console = 2;
  92     static const int unknown = 3;
  93
  94 #if TRACING_ON
  95   private:
  96     void dump();
  97
  98   public:
  99     void dprintf() { if (DTRACE(Stack)) dump(); }
 100 #else
 101   public:
 102     void dprintf() {}
 103 #endif
 104 };
 105
 106 inline bool
 107 StackTrace::trace(ExecContext *xc, StaticInstPtr inst)
 108 {
 109     if (!inst->isCall() && !inst->isReturn())
 110         return false;
 111
 112     if (valid())
 113         clear();
 114
 115     trace(xc, !inst->isReturn());
 116     return true;
 117 }
 118
 119 #endif // __ARCH_ALPHA_STACKTRACE_HH__