system.cc revision 3960 
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;
145
146void
147System::setMemoryMode(MemoryMode mode)
148{
149    assert(getState() == Drained);
150    memoryMode = mode;
151}
152
153bool System::breakpoint()
154{
155    return remoteGDB[0]->breakpoint();
156}
157
158int
159System::registerThreadContext(ThreadContext *tc, int id)
160{
161    if (id == -1) {
162        for (id = 0; id < threadContexts.size(); id++) {
163            if (!threadContexts[id])
164                break;
165        }
166    }
167
168    if (threadContexts.size() <= id)
169        threadContexts.resize(id + 1);
170
171    if (threadContexts[id])
172        panic("Cannot have two CPUs with the same id (%d)\n", id);
173
174    threadContexts[id] = tc;
175    numcpus++;
176
177    RemoteGDB *rgdb = new RemoteGDB(this, tc);
178    GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
179    gdbl->listen();
180    /**
181     * Uncommenting this line waits for a remote debugger to connect
182     * to the simulator before continuing.
183     */
184    if (rgdb_wait != -1 && rgdb_wait == id)
185        gdbl->accept();
186
187    if (remoteGDB.size() <= id) {
188        remoteGDB.resize(id + 1);
189    }
190
191    remoteGDB[id] = rgdb;
192
193    return id;
194}
195
196void
197System::startup()
198{
199    int i;
200    for (i = 0; i < threadContexts.size(); i++)
201        threadContexts[i]->activate(0);
202}
203
204void
205System::replaceThreadContext(ThreadContext *tc, int id)
206{
207    if (id >= threadContexts.size()) {
208        panic("replaceThreadContext: bad id, %d >= %d\n",
209              id, threadContexts.size());
210    }
211
212    threadContexts[id] = tc;
213    remoteGDB[id]->replaceThreadContext(tc);
214}
215
216#if !FULL_SYSTEM
217Addr
218System::new_page()
219{
220    Addr return_addr = page_ptr << LogVMPageSize;
221    ++page_ptr;
222    if (return_addr >= physmem->size())
223        fatal("Out of memory, please increase size of physical memory.");
224    return return_addr;
225}
226#endif
227
228void
229System::serialize(ostream &os)
230{
231#if FULL_SYSTEM
232    kernelSymtab->serialize("kernel_symtab", os);
233#endif // FULL_SYSTEM
234}
235
236
237void
238System::unserialize(Checkpoint *cp, const string &section)
239{
240#if FULL_SYSTEM
241    kernelSymtab->unserialize("kernel_symtab", cp, section);
242#endif // FULL_SYSTEM
243}
244
245void
246System::printSystems()
247{
248    vector<System *>::iterator i = systemList.begin();
249    vector<System *>::iterator end = systemList.end();
250    for (; i != end; ++i) {
251        System *sys = *i;
252        cerr << "System " << sys->name() << ": " << hex << sys << endl;
253    }
254}
255
256void
257printSystems()
258{
259    System::printSystems();
260}
261
262const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
263    "timing"};
264
265#if FULL_SYSTEM
266
267// In full system mode, only derived classes (e.g. AlphaLinuxSystem)
268// can be created directly.
269
270DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
271
272#else
273
274BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
275
276    SimObjectParam<PhysicalMemory *> physmem;
277    SimpleEnumParam<System::MemoryMode> mem_mode;
278
279END_DECLARE_SIM_OBJECT_PARAMS(System)
280
281BEGIN_INIT_SIM_OBJECT_PARAMS(System)
282
283    INIT_PARAM(physmem, "physical memory"),
284    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
285            System::MemoryModeStrings)
286
287END_INIT_SIM_OBJECT_PARAMS(System)
288
289CREATE_SIM_OBJECT(System)
290{
291    System::Params *p = new System::Params;
292    p->name = getInstanceName();
293    p->physmem = physmem;
294    p->mem_mode = mem_mode;
295    return new System(p);
296}
297
298REGISTER_SIM_OBJECT("System", System)
299
300#endif
301