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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*
* Copyright (c) 2001-2005 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 __PROCESS_HH__
#define __PROCESS_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.
//
#include "config/full_system.hh"
#if !FULL_SYSTEM
#include <vector>
#include "base/statistics.hh"
#include "base/trace.hh"
#include "mem/base_mem.hh"
#include "mem/mem_interface.hh"
#include "mem/page_table.hh"
#include "sim/sim_object.hh"
#include "sim/stats.hh"
#include "targetarch/isa_traits.hh"
class ExecContext;
class FunctionalMemory;
class System;
class Process : public SimObject
{
public:
/// Pointer to object representing the system this process is
/// running on.
System *system;
// 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::vector<ExecContext *> execContexts;
// number of CPUs (esxec contexts, really) assigned to this process.
unsigned int numCpus() { return execContexts.size(); }
// 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;
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;
// Base of region for mmaps (when user doesn't specify an address).
Addr mmap_start;
Addr mmap_end;
// Base of region for nxm data
Addr nxm_start;
Addr nxm_end;
std::string prog_fname; // file name
Addr prog_entry; // entry point (initial PC)
Stats::Scalar<> num_syscalls; // number of syscalls executed
protected:
// constructor
Process(const std::string &nm,
System *_system,
int stdin_fd, // initial I/O descriptors
int stdout_fd,
int stderr_fd);
// post initialization startup
virtual void startup();
protected:
/// Memory object for initialization (image loading)
FunctionalMemory *initVirtMem;
public:
PageTable *pTable;
private:
// file descriptor remapping support
static const int MAX_FD = 256; // 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.
// returns xc's cpu number (index into execContexts[])
int registerExecContext(ExecContext *xc);
void replaceExecContext(ExecContext *xc, int xcIndex);
// 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 alloc_fd(int sim_fd);
// free target fd (e.g., after close)
void free_fd(int tgt_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) ||
(next_thread_stack_base <= addr && addr < stack_base) ||
(text_base <= addr && addr < (text_base + text_size)) ||
(mmap_start <= addr && addr < mmap_end) ||
(nxm_start <= addr && addr < nxm_end));
}
virtual void syscall(ExecContext *xc) = 0;
};
//
// "Live" process with system calls redirected to host system
//
class ObjectFile;
class LiveProcess : public Process
{
protected:
ObjectFile *objFile;
std::vector<std::string> argv;
std::vector<std::string> envp;
LiveProcess(const std::string &nm, ObjectFile *objFile,
System *_system, int stdin_fd, int stdout_fd, int stderr_fd,
std::vector<std::string> &argv,
std::vector<std::string> &envp);
void startup();
public:
// this function is used to create the LiveProcess object, since
// we can't tell which subclass of LiveProcess to use until we
// open and look at the object file.
static LiveProcess *create(const std::string &nm,
System *_system,
int stdin_fd, int stdout_fd, int stderr_fd,
std::string executable,
std::vector<std::string> &argv,
std::vector<std::string> &envp);
};
#endif // !FULL_SYSTEM
#endif // __PROCESS_HH__
|
