src/arch/arm/stacktrace.hh

   1 /*
   2  * Copyright (c) 2005 The Regents of The University of Michigan
   3  * Copyright (c) 2007-2008 The Florida State University
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met: redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer;
  10  * redistributions in binary form must reproduce the above copyright
  11  * notice, this list of conditions and the following disclaimer in the
  12  * documentation and/or other materials provided with the distribution;
  13  * neither the name of the copyright holders nor the names of its
  14  * contributors may be used to endorse or promote products derived from
  15  * this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * Authors: Ali Saidi
  30  *          Stephen Hines
  31  */
  32
  33 #ifndef __ARCH_ARM_STACKTRACE_HH__
  34 #define __ARCH_ARM_STACKTRACE_HH__
  35
  36 #include "base/trace.hh"
  37 #include "cpu/static_inst.hh"
  38
  39 class ThreadContext;
  40 class StackTrace;
  41
  42 namespace ArmISA
  43 {
  44
  45 class ProcessInfo
  46 {
  47   private:
  48     ThreadContext *tc;
  49
  50     int thread_info_size;
  51     int task_struct_size;
  52     int task_off;
  53     int pid_off;
  54     int name_off;
  55
  56   public:
  57     ProcessInfo(ThreadContext *_tc);
  58
  59     Addr task(Addr ksp) const;
  60     int pid(Addr ksp) const;
  61     std::string name(Addr ksp) const;
  62 };
  63
  64 class StackTrace
  65 {
  66   protected:
  67     typedef TheISA::MachInst MachInst;
  68   private:
  69     ThreadContext *tc;
  70     std::vector<Addr> stack;
  71
  72   private:
  73     bool isEntry(Addr addr);
  74     bool decodePrologue(Addr sp, Addr callpc, Addr func, int &size, Addr &ra);
  75     bool decodeSave(MachInst inst, int &reg, int &disp);
  76     bool decodeStack(MachInst inst, int &disp);
  77
  78     void trace(ThreadContext *tc, bool is_call);
  79
  80   public:
  81     StackTrace();
  82     StackTrace(ThreadContext *tc, StaticInstPtr inst);
  83     ~StackTrace();
  84
  85     void clear()
  86     {
  87         tc = 0;
  88         stack.clear();
  89     }
  90
  91     bool valid() const { return tc != NULL; }
  92     bool trace(ThreadContext *tc, StaticInstPtr inst);
  93
  94   public:
  95     const std::vector<Addr> &getstack() const { return stack; }
  96
  97     static const int user = 1;
  98     static const int console = 2;
  99     static const int unknown = 3;
 100
 101 #if TRACING_ON
 102   private:
 103     void dump();
 104
 105   public:
 106     void dprintf() { if (DTRACE(Stack)) dump(); }
 107 #else
 108   public:
 109     void dprintf() {}
 110 #endif
 111 };
 112
 113 inline bool
 114 StackTrace::trace(ThreadContext *tc, StaticInstPtr inst)
 115 {
 116     if (!inst->isCall() && !inst->isReturn())
 117         return false;
 118
 119     if (valid())
 120         clear();
 121
 122     trace(tc, !inst->isReturn());
 123     return true;
 124 }
 125
 126 }
 127
 128 #endif // __ARCH_ARM_STACKTRACE_HH__