summaryrefslogtreecommitdiff
path: root/sim/prog.hh
blob: e0439024422c019fb9baf56ab1c0231f31fdd097 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * Copyright (c) 2003 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 __PROG_HH__
#define __PROG_HH__

//
// The purpose of this code is to fake the loader & syscall mechanism
// when there's no OS: thus there's no reason to use it in FULL_SYSTEM
// mode when we do have an OS.
//
#ifndef FULL_SYSTEM

#include <list>

#include "stats.hh"
#include "sim_object.hh"

#include "statistics.hh"
#include "sim_stats.hh"

class ExecContext;
class FunctionalMemory;
class Process : public SimObject
{
  public:

    // have we initialized an execution context from this process?  If
    // yes, subsequent contexts are assumed to be for dynamically
    // created threads and are not initialized.
    bool initialContextLoaded;

    // execution contexts associated with this process
    std::list<ExecContext *> execContexts;
    // number of CPUs assigned to this process: should match number of
    // contexts in execContexts list
    unsigned numCpus;

    // record of blocked context
    struct WaitRec
    {
        Addr waitChan;
        ExecContext *waitingContext;

        WaitRec(Addr chan, ExecContext *ctx)
            : waitChan(chan), waitingContext(ctx)
        {
        }
    };

    // list of all blocked contexts
    std::list<WaitRec> waitList;

    RegFile *init_regs;		// initial register contents

    Addr text_base;		// text (code) segment base
    unsigned text_size;		// text (code) size in bytes

    Addr data_base;		// initialized data segment base
    unsigned data_size;		// initialized data + bss size in bytes

    Addr brk_point;		// top of the data segment

    Addr stack_base;		// stack segment base (highest address)
    unsigned stack_size;	// initial stack size
    Addr stack_min;		// lowest address accessed on the stack


    // addr to use for next stack region (for multithreaded apps)
    Addr next_thread_stack_base;

    std::string prog_fname;	// file name
    Addr prog_entry;		// entry point (initial PC)

    Statistics::Scalar<> num_syscalls;	// number of syscalls executed


  protected:
    // constructor
    Process(const std::string &name,
            int stdin_fd, 	// initial I/O descriptors
            int stdout_fd,
            int stderr_fd);


  protected:
    FunctionalMemory *memory;

  private:
    // file descriptor remapping support
    static const int MAX_FD = 100;	// max legal fd value
    int fd_map[MAX_FD+1];

  public:
    // static helper functions to generate file descriptors for constructor
    static int openInputFile(const std::string &filename);
    static int openOutputFile(const std::string &filename);

    // override of virtual SimObject method: register statistics
    virtual void regStats();

    // register an execution context for this process
    void registerExecContext(ExecContext *);

    // map simulator fd sim_fd to target fd tgt_fd
    void dup_fd(int sim_fd, int tgt_fd);

    // generate new target fd for sim_fd
    int open_fd(int sim_fd);

    // look up simulator fd for given target fd
    int sim_fd(int tgt_fd);

    // is this a valid instruction fetch address?
    bool validInstAddr(Addr addr)
    {
        return (text_base <= addr &&
                addr < text_base + text_size &&
                !(addr & (sizeof(MachInst)-1)));
    }

    // is this a valid address? (used to filter data fetches)
    // note that we just assume stack size <= 16MB
    // this may be alpha-specific
    bool validDataAddr(Addr addr)
    {
        return ((data_base <= addr && addr < brk_point) ||
                ((stack_base - 16*1024*1024) <= addr && addr < stack_base) ||
                (text_base <= addr && addr < (text_base + text_size)));
    }

    virtual void syscall(ExecContext *xc) = 0;

    virtual FunctionalMemory *getMemory() { return memory; }
};

//
// "Live" process with system calls redirected to host system
//
class MainMemory;
class LiveProcess : public Process
{
  public:
    LiveProcess(const std::string &name,
                int stdin_fd, int stdout_fd, int stderr_fd,
                std::vector<std::string> &argv,
                std::vector<std::string> &envp);

    virtual void syscall(ExecContext *xc);
};

#endif // !FULL_SYSTEM

#endif // __PROG_HH__