system.cc revision 4095 
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 "base/loader/object_file.hh"
37#include "base/loader/symtab.hh"
38#include "base/trace.hh"
39#include "cpu/thread_context.hh"
40#include "mem/mem_object.hh"
41#include "mem/physical.hh"
42#include "sim/builder.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#endif
49
50using namespace std;
51using namespace TheISA;
52
53vector<System *> System::systemList;
54
55int System::numSystemsRunning = 0;
56
57System::System(Params *p)
58    : SimObject(p->name), physmem(p->physmem), numcpus(0),
59#if FULL_SYSTEM
60      init_param(p->init_param),
61      functionalPort(p->name + "-fport"),
62      virtPort(p->name + "-vport"),
63#else
64      page_ptr(0),
65#endif
66      memoryMode(p->mem_mode), _params(p)
67{
68    // add self to global system list
69    systemList.push_back(this);
70
71#if FULL_SYSTEM
72    kernelSymtab = new SymbolTable;
73    debugSymbolTable = new SymbolTable;
74
75
76    /**
77     * Get a functional port to memory
78     */
79    Port *mem_port;
80    mem_port = physmem->getPort("functional");
81    functionalPort.setPeer(mem_port);
82    mem_port->setPeer(&functionalPort);
83
84    mem_port = physmem->getPort("functional");
85    virtPort.setPeer(mem_port);
86    mem_port->setPeer(&virtPort);
87
88
89    /**
90     * Load the kernel code into memory
91     */
92    if (params()->kernel_path == "") {
93        warn("No kernel set for full system simulation. Assuming you know what"
94                " you're doing...\n");
95    } else {
96        // Load kernel code
97        kernel = createObjectFile(params()->kernel_path);
98        if (kernel == NULL)
99            fatal("Could not load kernel file %s", params()->kernel_path);
100
101        // Load program sections into memory
102        kernel->loadSections(&functionalPort, LoadAddrMask);
103
104        // setup entry points
105        kernelStart = kernel->textBase();
106        kernelEnd = kernel->bssBase() + kernel->bssSize();
107        kernelEntry = kernel->entryPoint();
108
109        // load symbols
110        if (!kernel->loadGlobalSymbols(kernelSymtab))
111            panic("could not load kernel symbols\n");
112
113        if (!kernel->loadLocalSymbols(kernelSymtab))
114            panic("could not load kernel local symbols\n");
115
116        if (!kernel->loadGlobalSymbols(debugSymbolTable))
117            panic("could not load kernel symbols\n");
118
119        if (!kernel->loadLocalSymbols(debugSymbolTable))
120            panic("could not load kernel local symbols\n");
121
122        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
123        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
124        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
125        DPRINTF(Loader, "Kernel loaded...\n");
126    }
127#endif // FULL_SYSTEM
128
129    // increment the number of running systms
130    numSystemsRunning++;
131}
132
133System::~System()
134{
135#if FULL_SYSTEM
136    delete kernelSymtab;
137    delete kernel;
138#else
139    panic("System::fixFuncEventAddr needs to be rewritten "
140          "to work with syscall emulation");
141#endif // FULL_SYSTEM}
142}
143
144int rgdb_wait = -1;
145int rgdb_enable = true;
146
147void
148System::setMemoryMode(MemoryMode mode)
149{
150    assert(getState() == Drained);
151    memoryMode = mode;
152}
153
154bool System::breakpoint()
155{
156    if (remoteGDB.size())
157        return remoteGDB[0]->breakpoint();
158    return false;
159}
160
161int
162System::registerThreadContext(ThreadContext *tc, int id)
163{
164    if (id == -1) {
165        for (id = 0; id < threadContexts.size(); id++) {
166            if (!threadContexts[id])
167                break;
168        }
169    }
170
171    if (threadContexts.size() <= id)
172        threadContexts.resize(id + 1);
173
174    if (threadContexts[id])
175        panic("Cannot have two CPUs with the same id (%d)\n", id);
176
177    threadContexts[id] = tc;
178    numcpus++;
179
180    if (rgdb_enable) {
181        RemoteGDB *rgdb = new RemoteGDB(this, tc);
182        GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
183        gdbl->listen();
184        /**
185         * Uncommenting this line waits for a remote debugger to
186         * connect to the simulator before continuing.
187         */
188        if (rgdb_wait != -1 && rgdb_wait == id)
189            gdbl->accept();
190
191        if (remoteGDB.size() <= id) {
192            remoteGDB.resize(id + 1);
193        }
194
195        remoteGDB[id] = rgdb;
196    }
197
198    return id;
199}
200
201void
202System::startup()
203{
204    int i;
205    for (i = 0; i < threadContexts.size(); i++)
206        threadContexts[i]->activate(0);
207}
208
209void
210System::replaceThreadContext(ThreadContext *tc, int id)
211{
212    if (id >= threadContexts.size()) {
213        panic("replaceThreadContext: bad id, %d >= %d\n",
214              id, threadContexts.size());
215    }
216
217    threadContexts[id] = tc;
218    if (id < remoteGDB.size())
219        remoteGDB[id]->replaceThreadContext(tc);
220}
221
222#if !FULL_SYSTEM
223Addr
224System::new_page()
225{
226    Addr return_addr = page_ptr << LogVMPageSize;
227    ++page_ptr;
228    if (return_addr >= physmem->size())
229        fatal("Out of memory, please increase size of physical memory.");
230    return return_addr;
231}
232#endif
233
234void
235System::serialize(ostream &os)
236{
237#if FULL_SYSTEM
238    kernelSymtab->serialize("kernel_symtab", os);
239#endif // FULL_SYSTEM
240}
241
242
243void
244System::unserialize(Checkpoint *cp, const string &section)
245{
246#if FULL_SYSTEM
247    kernelSymtab->unserialize("kernel_symtab", cp, section);
248#endif // FULL_SYSTEM
249}
250
251void
252System::printSystems()
253{
254    vector<System *>::iterator i = systemList.begin();
255    vector<System *>::iterator end = systemList.end();
256    for (; i != end; ++i) {
257        System *sys = *i;
258        cerr << "System " << sys->name() << ": " << hex << sys << endl;
259    }
260}
261
262void
263printSystems()
264{
265    System::printSystems();
266}
267
268const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
269    "timing"};
270
271#if FULL_SYSTEM
272
273// In full system mode, only derived classes (e.g. AlphaLinuxSystem)
274// can be created directly.
275
276DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
277
278#else
279
280BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
281
282    SimObjectParam<PhysicalMemory *> physmem;
283    SimpleEnumParam<System::MemoryMode> mem_mode;
284
285END_DECLARE_SIM_OBJECT_PARAMS(System)
286
287BEGIN_INIT_SIM_OBJECT_PARAMS(System)
288
289    INIT_PARAM(physmem, "physical memory"),
290    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
291            System::MemoryModeStrings)
292
293END_INIT_SIM_OBJECT_PARAMS(System)
294
295CREATE_SIM_OBJECT(System)
296{
297    System::Params *p = new System::Params;
298    p->name = getInstanceName();
299    p->physmem = physmem;
300    p->mem_mode = mem_mode;
301    return new System(p);
302}
303
304REGISTER_SIM_OBJECT("System", System)
305
306#endif
307