system.cc revision 5512 
1/*
2 * Copyright (c) 2003-2006 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: Steve Reinhardt
29 *          Lisa Hsu
30 *          Nathan Binkert
31 *          Ali Saidi
32 */
33
34#include "arch/isa_traits.hh"
35#include "arch/remote_gdb.hh"
36#include "arch/utility.hh"
37#include "base/loader/object_file.hh"
38#include "base/loader/symtab.hh"
39#include "base/trace.hh"
40#include "cpu/thread_context.hh"
41#include "mem/mem_object.hh"
42#include "mem/physical.hh"
43#include "sim/byteswap.hh"
44#include "sim/system.hh"
45#include "sim/debug.hh"
46#if FULL_SYSTEM
47#include "arch/vtophys.hh"
48#include "kern/kernel_stats.hh"
49#else
50#include "params/System.hh"
51#endif
52
53using namespace std;
54using namespace TheISA;
55
56vector<System *> System::systemList;
57
58int System::numSystemsRunning = 0;
59
60System::System(Params *p)
61    : SimObject(p), physmem(p->physmem), numcpus(0),
62#if FULL_SYSTEM
63      init_param(p->init_param),
64      functionalPort(p->name + "-fport"),
65      virtPort(p->name + "-vport"),
66#else
67      page_ptr(0),
68      next_PID(0),
69#endif
70      memoryMode(p->mem_mode), _params(p)
71{
72    // add self to global system list
73    systemList.push_back(this);
74
75#if FULL_SYSTEM
76    kernelSymtab = new SymbolTable;
77    if (!debugSymbolTable)
78        debugSymbolTable = new SymbolTable;
79
80
81    /**
82     * Get a functional port to memory
83     */
84    Port *mem_port;
85    mem_port = physmem->getPort("functional");
86    functionalPort.setPeer(mem_port);
87    mem_port->setPeer(&functionalPort);
88
89    mem_port = physmem->getPort("functional");
90    virtPort.setPeer(mem_port);
91    mem_port->setPeer(&virtPort);
92
93
94    /**
95     * Load the kernel code into memory
96     */
97    if (params()->kernel == "") {
98        warn("No kernel set for full system simulation. Assuming you know what"
99                " you're doing...\n");
100    } else {
101        // Load kernel code
102        kernel = createObjectFile(params()->kernel);
103        warn("kernel located at: %s", params()->kernel);
104
105        if (kernel == NULL)
106            fatal("Could not load kernel file %s", params()->kernel);
107
108        // Load program sections into memory
109        kernel->loadSections(&functionalPort, LoadAddrMask);
110
111        // setup entry points
112        kernelStart = kernel->textBase();
113        kernelEnd = kernel->bssBase() + kernel->bssSize();
114        kernelEntry = kernel->entryPoint();
115
116        // load symbols
117        if (!kernel->loadGlobalSymbols(kernelSymtab))
118            panic("could not load kernel symbols\n");
119
120        if (!kernel->loadLocalSymbols(kernelSymtab))
121            panic("could not load kernel local symbols\n");
122
123        if (!kernel->loadGlobalSymbols(debugSymbolTable))
124            panic("could not load kernel symbols\n");
125
126        if (!kernel->loadLocalSymbols(debugSymbolTable))
127            panic("could not load kernel local symbols\n");
128
129        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
130        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
131        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
132        DPRINTF(Loader, "Kernel loaded...\n");
133    }
134#endif // FULL_SYSTEM
135
136    // increment the number of running systms
137    numSystemsRunning++;
138}
139
140System::~System()
141{
142#if FULL_SYSTEM
143    delete kernelSymtab;
144    delete kernel;
145#else
146    panic("System::fixFuncEventAddr needs to be rewritten "
147          "to work with syscall emulation");
148#endif // FULL_SYSTEM}
149}
150
151int rgdb_wait = -1;
152int rgdb_enable = true;
153
154void
155System::setMemoryMode(Enums::MemoryMode mode)
156{
157    assert(getState() == Drained);
158    memoryMode = mode;
159}
160
161bool System::breakpoint()
162{
163    if (remoteGDB.size())
164        return remoteGDB[0]->breakpoint();
165    return false;
166}
167
168int
169System::registerThreadContext(ThreadContext *tc, int id)
170{
171    if (id == -1) {
172        for (id = 0; id < threadContexts.size(); id++) {
173            if (!threadContexts[id])
174                break;
175        }
176    }
177
178    if (threadContexts.size() <= id)
179        threadContexts.resize(id + 1);
180
181    if (threadContexts[id])
182        panic("Cannot have two CPUs with the same id (%d)\n", id);
183
184    threadContexts[id] = tc;
185    numcpus++;
186
187    int port = getRemoteGDBPort();
188    if (rgdb_enable && port) {
189        RemoteGDB *rgdb = new RemoteGDB(this, tc);
190        GDBListener *gdbl = new GDBListener(rgdb, port + id);
191        gdbl->listen();
192        /**
193         * Uncommenting this line waits for a remote debugger to
194         * connect to the simulator before continuing.
195         */
196        if (rgdb_wait != -1 && rgdb_wait == id)
197            gdbl->accept();
198
199        if (remoteGDB.size() <= id) {
200            remoteGDB.resize(id + 1);
201        }
202
203        remoteGDB[id] = rgdb;
204    }
205
206    return id;
207}
208
209void
210System::startup()
211{
212    int i;
213    for (i = 0; i < threadContexts.size(); i++)
214        TheISA::startupCPU(threadContexts[i], i);
215}
216
217void
218System::replaceThreadContext(ThreadContext *tc, int id)
219{
220    if (id >= threadContexts.size()) {
221        panic("replaceThreadContext: bad id, %d >= %d\n",
222              id, threadContexts.size());
223    }
224
225    threadContexts[id] = tc;
226    if (id < remoteGDB.size())
227        remoteGDB[id]->replaceThreadContext(tc);
228}
229
230#if !FULL_SYSTEM
231Addr
232System::new_page()
233{
234    Addr return_addr = page_ptr << LogVMPageSize;
235    ++page_ptr;
236    if (return_addr >= physmem->size())
237        fatal("Out of memory, please increase size of physical memory.");
238    return return_addr;
239}
240#endif
241
242void
243System::serialize(ostream &os)
244{
245#if FULL_SYSTEM
246    kernelSymtab->serialize("kernel_symtab", os);
247#else // !FULL_SYSTEM
248    SERIALIZE_SCALAR(page_ptr);
249#endif
250}
251
252
253void
254System::unserialize(Checkpoint *cp, const string &section)
255{
256#if FULL_SYSTEM
257    kernelSymtab->unserialize("kernel_symtab", cp, section);
258#else // !FULL_SYSTEM
259    UNSERIALIZE_SCALAR(page_ptr);
260#endif
261}
262
263void
264System::printSystems()
265{
266    vector<System *>::iterator i = systemList.begin();
267    vector<System *>::iterator end = systemList.end();
268    for (; i != end; ++i) {
269        System *sys = *i;
270        cerr << "System " << sys->name() << ": " << hex << sys << endl;
271    }
272}
273
274void
275printSystems()
276{
277    System::printSystems();
278}
279
280const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
281    "timing"};
282
283#if !FULL_SYSTEM
284
285System *
286SystemParams::create()
287{
288    System::Params *p = new System::Params;
289    p->name = name;
290    p->physmem = physmem;
291    p->mem_mode = mem_mode;
292    return new System(p);
293}
294
295#endif
296