system.cc revision 5183 
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#if FULL_SYSTEM
46#include "arch/vtophys.hh"
47#include "kern/kernel_stats.hh"
48#else
49#include "params/System.hh"
50#endif
51
52using namespace std;
53using namespace TheISA;
54
55vector<System *> System::systemList;
56
57int System::numSystemsRunning = 0;
58
59System::System(Params *p)
60    : SimObject(p), physmem(p->physmem), numcpus(0),
61#if FULL_SYSTEM
62      init_param(p->init_param),
63      functionalPort(p->name + "-fport"),
64      virtPort(p->name + "-vport"),
65#else
66      page_ptr(0),
67      next_PID(0),
68#endif
69      memoryMode(p->mem_mode), _params(p)
70{
71    // add self to global system list
72    systemList.push_back(this);
73
74#if FULL_SYSTEM
75    kernelSymtab = new SymbolTable;
76    if (!debugSymbolTable)
77        debugSymbolTable = new SymbolTable;
78
79
80    /**
81     * Get a functional port to memory
82     */
83    Port *mem_port;
84    mem_port = physmem->getPort("functional");
85    functionalPort.setPeer(mem_port);
86    mem_port->setPeer(&functionalPort);
87
88    mem_port = physmem->getPort("functional");
89    virtPort.setPeer(mem_port);
90    mem_port->setPeer(&virtPort);
91
92
93    /**
94     * Load the kernel code into memory
95     */
96    if (params()->kernel == "") {
97        warn("No kernel set for full system simulation. Assuming you know what"
98                " you're doing...\n");
99    } else {
100        // Load kernel code
101        kernel = createObjectFile(params()->kernel);
102        if (kernel == NULL)
103            fatal("Could not load kernel file %s", params()->kernel);
104
105        // Load program sections into memory
106        kernel->loadSections(&functionalPort, LoadAddrMask);
107
108        // setup entry points
109        kernelStart = kernel->textBase();
110        kernelEnd = kernel->bssBase() + kernel->bssSize();
111        kernelEntry = kernel->entryPoint();
112
113        // load symbols
114        if (!kernel->loadGlobalSymbols(kernelSymtab))
115            panic("could not load kernel symbols\n");
116
117        if (!kernel->loadLocalSymbols(kernelSymtab))
118            panic("could not load kernel local symbols\n");
119
120        if (!kernel->loadGlobalSymbols(debugSymbolTable))
121            panic("could not load kernel symbols\n");
122
123        if (!kernel->loadLocalSymbols(debugSymbolTable))
124            panic("could not load kernel local symbols\n");
125
126        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
127        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
128        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
129        DPRINTF(Loader, "Kernel loaded...\n");
130    }
131#endif // FULL_SYSTEM
132
133    // increment the number of running systms
134    numSystemsRunning++;
135}
136
137System::~System()
138{
139#if FULL_SYSTEM
140    delete kernelSymtab;
141    delete kernel;
142#else
143    panic("System::fixFuncEventAddr needs to be rewritten "
144          "to work with syscall emulation");
145#endif // FULL_SYSTEM}
146}
147
148int rgdb_wait = -1;
149int rgdb_enable = true;
150
151void
152System::setMemoryMode(Enums::MemoryMode mode)
153{
154    assert(getState() == Drained);
155    memoryMode = mode;
156}
157
158bool System::breakpoint()
159{
160    if (remoteGDB.size())
161        return remoteGDB[0]->breakpoint();
162    return false;
163}
164
165int
166System::registerThreadContext(ThreadContext *tc, int id)
167{
168    if (id == -1) {
169        for (id = 0; id < threadContexts.size(); id++) {
170            if (!threadContexts[id])
171                break;
172        }
173    }
174
175    if (threadContexts.size() <= id)
176        threadContexts.resize(id + 1);
177
178    if (threadContexts[id])
179        panic("Cannot have two CPUs with the same id (%d)\n", id);
180
181    threadContexts[id] = tc;
182    numcpus++;
183
184    if (rgdb_enable) {
185        RemoteGDB *rgdb = new RemoteGDB(this, tc);
186        GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
187        gdbl->listen();
188        /**
189         * Uncommenting this line waits for a remote debugger to
190         * connect to the simulator before continuing.
191         */
192        if (rgdb_wait != -1 && rgdb_wait == id)
193            gdbl->accept();
194
195        if (remoteGDB.size() <= id) {
196            remoteGDB.resize(id + 1);
197        }
198
199        remoteGDB[id] = rgdb;
200    }
201
202    return id;
203}
204
205void
206System::startup()
207{
208    int i;
209    for (i = 0; i < threadContexts.size(); i++)
210        TheISA::startupCPU(threadContexts[i], i);
211}
212
213void
214System::replaceThreadContext(ThreadContext *tc, int id)
215{
216    if (id >= threadContexts.size()) {
217        panic("replaceThreadContext: bad id, %d >= %d\n",
218              id, threadContexts.size());
219    }
220
221    threadContexts[id] = tc;
222    if (id < remoteGDB.size())
223        remoteGDB[id]->replaceThreadContext(tc);
224}
225
226#if !FULL_SYSTEM
227Addr
228System::new_page()
229{
230    Addr return_addr = page_ptr << LogVMPageSize;
231    ++page_ptr;
232    if (return_addr >= physmem->size())
233        fatal("Out of memory, please increase size of physical memory.");
234    return return_addr;
235}
236#endif
237
238void
239System::serialize(ostream &os)
240{
241#if FULL_SYSTEM
242    kernelSymtab->serialize("kernel_symtab", os);
243#else // !FULL_SYSTEM
244    SERIALIZE_SCALAR(page_ptr);
245#endif
246}
247
248
249void
250System::unserialize(Checkpoint *cp, const string &section)
251{
252#if FULL_SYSTEM
253    kernelSymtab->unserialize("kernel_symtab", cp, section);
254#else // !FULL_SYSTEM
255    UNSERIALIZE_SCALAR(page_ptr);
256#endif
257}
258
259void
260System::printSystems()
261{
262    vector<System *>::iterator i = systemList.begin();
263    vector<System *>::iterator end = systemList.end();
264    for (; i != end; ++i) {
265        System *sys = *i;
266        cerr << "System " << sys->name() << ": " << hex << sys << endl;
267    }
268}
269
270void
271printSystems()
272{
273    System::printSystems();
274}
275
276const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
277    "timing"};
278
279#if !FULL_SYSTEM
280
281System *
282SystemParams::create()
283{
284    System::Params *p = new System::Params;
285    p->name = name;
286    p->physmem = physmem;
287    p->mem_mode = mem_mode;
288    return new System(p);
289}
290
291#endif
292