process.hh revision 5282:2dba627b6646 
1/*
2 * Copyright (c) 2001-2005 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 * Authors: Nathan Binkert
29 *          Steve Reinhardt
30 */
31
32#ifndef __PROCESS_HH__
33#define __PROCESS_HH__
34
35//
36// The purpose of this code is to fake the loader & syscall mechanism
37// when there's no OS: thus there's no reason to use it in FULL_SYSTEM
38// mode when we do have an OS.
39//
40#include "config/full_system.hh"
41
42#if !FULL_SYSTEM
43
44#include <string>
45#include <vector>
46
47#include "base/statistics.hh"
48#include "sim/host.hh"
49#include "sim/sim_object.hh"
50
51class GDBListener;
52class PageTable;
53class ProcessParams;
54class LiveProcessParams;
55class SyscallDesc;
56class System;
57class ThreadContext;
58class TranslatingPort;
59namespace TheISA
60{
61    class RemoteGDB;
62}
63
64class Process : public SimObject
65{
66  public:
67
68    /// Pointer to object representing the system this process is
69    /// running on.
70    System *system;
71
72    // have we initialized a thread context from this process?  If
73    // yes, subsequent contexts are assumed to be for dynamically
74    // created threads and are not initialized.
75    bool initialContextLoaded;
76
77    bool checkpointRestored;
78
79    // thread contexts associated with this process
80    std::vector<ThreadContext *> threadContexts;
81
82    // remote gdb objects
83    std::vector<TheISA::RemoteGDB *> remoteGDB;
84    std::vector<GDBListener *> gdbListen;
85    bool breakpoint();
86
87    // number of CPUs (esxec contexts, really) assigned to this process.
88    unsigned int numCpus() { return threadContexts.size(); }
89
90    // record of blocked context
91    struct WaitRec
92    {
93        Addr waitChan;
94        ThreadContext *waitingContext;
95
96        WaitRec(Addr chan, ThreadContext *ctx)
97            : waitChan(chan), waitingContext(ctx)
98        {	}
99    };
100
101    // list of all blocked contexts
102    std::list<WaitRec> waitList;
103
104    Addr brk_point;		// top of the data segment
105
106    Addr stack_base;		// stack segment base (highest address)
107    unsigned stack_size;	// initial stack size
108    Addr stack_min;		// lowest address accessed on the stack
109
110    // The maximum size allowed for the stack.
111    Addr max_stack_size;
112
113    // addr to use for next stack region (for multithreaded apps)
114    Addr next_thread_stack_base;
115
116    // Base of region for mmaps (when user doesn't specify an address).
117    Addr mmap_start;
118    Addr mmap_end;
119
120    // Base of region for nxm data
121    Addr nxm_start;
122    Addr nxm_end;
123
124    std::string prog_fname;	// file name
125
126    Stats::Scalar<> num_syscalls;	// number of syscalls executed
127
128
129  protected:
130    // constructor
131    Process(ProcessParams * params);
132
133    // post initialization startup
134    virtual void startup();
135
136  protected:
137    /// Memory object for initialization (image loading)
138    TranslatingPort *initVirtMem;
139
140  public:
141    PageTable *pTable;
142
143    //This id is assigned by m5 and is used to keep process' tlb entries
144    //separated.
145    uint64_t M5_pid;
146
147    class FdMap
148    {
149      public:
150            int fd;
151            std::string filename;
152            int mode;
153            int flags;
154            bool isPipe;
155            int readPipeSource;
156            uint64_t fileOffset;
157
158
159            FdMap()
160            {
161                    fd = -1;
162                    filename = "NULL";
163                    mode = 0;
164                    flags = 0;
165                    isPipe = false;
166                    readPipeSource = 0;
167                    fileOffset = 0;
168
169            }
170
171        void serialize(std::ostream &os);
172        void unserialize(Checkpoint *cp, const std::string &section);
173
174    };
175
176  private:
177    // file descriptor remapping support
178    static const int MAX_FD = 256;    // max legal fd value
179    FdMap fd_map[MAX_FD+1];
180
181
182  public:
183    // static helper functions to generate file descriptors for constructor
184    static int openInputFile(const std::string &filename);
185    static int openOutputFile(const std::string &filename);
186
187    // override of virtual SimObject method: register statistics
188    virtual void regStats();
189
190    // register a thread context for this process.
191    // returns tc's cpu number (index into threadContexts[])
192    int registerThreadContext(ThreadContext *tc);
193
194
195    void replaceThreadContext(ThreadContext *tc, int tcIndex);
196
197    // map simulator fd sim_fd to target fd tgt_fd
198    void dup_fd(int sim_fd, int tgt_fd);
199
200    // generate new target fd for sim_fd
201    int alloc_fd(int sim_fd, std::string filename, int flags, int mode, bool pipe);
202
203    // free target fd (e.g., after close)
204    void free_fd(int tgt_fd);
205
206    // look up simulator fd for given target fd
207    int sim_fd(int tgt_fd);
208
209    // look up simulator fd_map object for a given target fd
210    FdMap * sim_fd_obj(int tgt_fd);
211
212    // fix all offsets for currently open files and save them
213    void fix_file_offsets();
214
215    // find all offsets for currently open files and save them
216    void find_file_offsets();
217
218    // set the source of this read pipe for a checkpoint resume
219    void setReadPipeSource(int read_pipe_fd, int source_fd);
220
221    virtual void syscall(int64_t callnum, ThreadContext *tc) = 0;
222
223    // check if the this addr is on the next available page and allocate it
224    // if it's not we'll panic
225    bool checkAndAllocNextPage(Addr vaddr);
226
227    void serialize(std::ostream &os);
228    void unserialize(Checkpoint *cp, const std::string &section);
229};
230
231//
232// "Live" process with system calls redirected to host system
233//
234class ObjectFile;
235class LiveProcess : public Process
236{
237  protected:
238    ObjectFile *objFile;
239    std::vector<std::string> argv;
240    std::vector<std::string> envp;
241    std::string cwd;
242
243    LiveProcess(LiveProcessParams * params, ObjectFile *objFile);
244
245    virtual void argsInit(int intSize, int pageSize);
246
247    // Id of the owner of the process
248    uint64_t __uid;
249    uint64_t __euid;
250    uint64_t __gid;
251    uint64_t __egid;
252
253    // pid of the process and it's parent
254    uint64_t __pid;
255    uint64_t __ppid;
256
257  public:
258
259    enum AuxiliaryVectorType {
260        M5_AT_NULL = 0,
261        M5_AT_IGNORE = 1,
262        M5_AT_EXECFD = 2,
263        M5_AT_PHDR = 3,
264        M5_AT_PHENT = 4,
265        M5_AT_PHNUM = 5,
266        M5_AT_PAGESZ = 6,
267        M5_AT_BASE = 7,
268        M5_AT_FLAGS = 8,
269        M5_AT_ENTRY = 9,
270        M5_AT_NOTELF = 10,
271        M5_AT_UID = 11,
272        M5_AT_EUID = 12,
273        M5_AT_GID = 13,
274        M5_AT_EGID = 14,
275        // The following may be specific to Linux
276        M5_AT_PLATFORM = 15,
277        M5_AT_HWCAP = 16,
278        M5_AT_CLKTCK = 17,
279
280        M5_AT_SECURE = 23,
281
282        M5_AT_VECTOR_SIZE = 44
283    };
284
285    inline uint64_t uid() {return __uid;}
286    inline uint64_t euid() {return __euid;}
287    inline uint64_t gid() {return __gid;}
288    inline uint64_t egid() {return __egid;}
289    inline uint64_t pid() {return __pid;}
290    inline uint64_t ppid() {return __ppid;}
291
292    std::string
293    fullPath(const std::string &filename)
294    {
295        if (filename[0] == '/' || cwd.empty())
296            return filename;
297
298        std::string full = cwd;
299
300        if (cwd[cwd.size() - 1] != '/')
301            full += '/';
302
303        return full + filename;
304    }
305
306    virtual void syscall(int64_t callnum, ThreadContext *tc);
307
308    virtual SyscallDesc* getDesc(int callnum) = 0;
309
310    // this function is used to create the LiveProcess object, since
311    // we can't tell which subclass of LiveProcess to use until we
312    // open and look at the object file.
313    static LiveProcess *create(LiveProcessParams * params);
314};
315
316
317#endif // !FULL_SYSTEM
318
319#endif // __PROCESS_HH__
320