xref: /gem5/src/arch/x86/stacktrace.hh

/*
 * Copyright (c) 2006 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.
 *
 * Authors: Nathan Binkert
 */

#ifndef __ARCH_X86_STACKTRACE_HH__
#define __ARCH_X86_STACKTRACE_HH__

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

class ThreadContext;
namespace X86ISA
{
    class StackTrace;

    class ProcessInfo
    {
      private:
        ThreadContext *tc;

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

      public:
        ProcessInfo(ThreadContext *_tc);

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

    class StackTrace
    {
      private:
        ThreadContext *tc;
        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(ThreadContext *tc, bool is_call);

      public:
        StackTrace();
        StackTrace(ThreadContext *tc, StaticInstPtr inst);
        ~StackTrace();

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

        bool valid() const { return tc != NULL; }
        bool trace(ThreadContext *tc, 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(ThreadContext *tc, StaticInstPtr inst)
    {
        if (!inst->isCall() && !inst->isReturn())
            return false;

        if (valid())
            clear();

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

#endif // __ARCH_X86_STACKTRACE_HH__