/*
 * Copyright (c) 2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __ARCH_ALPHA_STACKTRACE_HH__
#define __ARCH_ALPHA_STACKTRACE_HH__

#include "base/trace.hh"
#include "cpu/static_inst.hh"

class ExecContext;
class StackTrace;

class ProcessInfo
{
  private:
    ExecContext *xc;

    int thread_info_size;
    int task_struct_size;
    int task_off;
    int pid_off;
    int name_off;

  public:
    ProcessInfo(ExecContext *_xc);

    Addr task(Addr ksp) const;
    int pid(Addr ksp) const;
    std::string name(Addr ksp) const;
};

class StackTrace
{
  protected:
    typedef TheISA::MachInst MachInst;
  private:
    ExecContext *xc;
    std::vector<Addr> stack;

  private:
    bool isEntry(Addr addr);
    bool decodePrologue(Addr sp, Addr callpc, Addr func, int &size, Addr &ra);
    bool decodeSave(MachInst inst, int &reg, int &disp);
    bool decodeStack(MachInst inst, int &disp);

    void trace(ExecContext *xc, bool is_call);

  public:
    StackTrace();
    StackTrace(ExecContext *xc, StaticInstPtr inst);
    ~StackTrace();

    void clear()
    {
        xc = 0;
        stack.clear();
    }

    bool valid() const { return xc != NULL; }
    bool trace(ExecContext *xc, StaticInstPtr inst);

  public:
    const std::vector<Addr> &getstack() const { return stack; }

    static const int user = 1;
    static const int console = 2;
    static const int unknown = 3;

#if TRACING_ON
  private:
    void dump();

  public:
    void dprintf() { if (DTRACE(Stack)) dump(); }
#else
  public:
    void dprintf() {}
#endif
};

inline bool
StackTrace::trace(ExecContext *xc, StaticInstPtr inst)
{
    if (!inst->isCall() && !inst->isReturn())
        return false;

    if (valid())
        clear();

    trace(xc, !inst->isReturn());
    return true;
}

#endif // __ARCH_ALPHA_STACKTRACE_HH__