src/sim/system.cc

   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
  53 using namespace std;
  54 using namespace TheISA;
  55
  56 vector<System *> System::systemList;
  57
  58 int System::numSystemsRunning = 0;
  59
  60 System::System(Params *p)
  61     : SimObject(p), physmem(p->physmem), _numContexts(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         inform("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         inform("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             fatal("could not load kernel symbols\n");
 119
 120         if (!kernel->loadLocalSymbols(kernelSymtab))
 121             fatal("could not load kernel local symbols\n");
 122
 123         if (!kernel->loadGlobalSymbols(debugSymbolTable))
 124             fatal("could not load kernel symbols\n");
 125
 126         if (!kernel->loadLocalSymbols(debugSymbolTable))
 127             fatal("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
 140 System::~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
 151 int rgdb_wait = -1;
 152 int rgdb_enable = true;
 153
 154 void
 155 System::setMemoryMode(Enums::MemoryMode mode)
 156 {
 157     assert(getState() == Drained);
 158     memoryMode = mode;
 159 }
 160
 161 bool System::breakpoint()
 162 {
 163     if (remoteGDB.size())
 164         return remoteGDB[0]->breakpoint();
 165     return false;
 166 }
 167
 168 int
 169 System::registerThreadContext(ThreadContext *tc, int assigned)
 170 {
 171     int id;
 172     if (assigned == -1) {
 173         for (id = 0; id < threadContexts.size(); id++) {
 174             if (!threadContexts[id])
 175                 break;
 176         }
 177
 178         if (threadContexts.size() <= id)
 179             threadContexts.resize(id + 1);
 180     } else {
 181         if (threadContexts.size() <= assigned)
 182             threadContexts.resize(assigned + 1);
 183         id = assigned;
 184     }
 185
 186     if (threadContexts[id])
 187         fatal("Cannot have two CPUs with the same id (%d)\n", id);
 188
 189     threadContexts[id] = tc;
 190     _numContexts++;
 191
 192     int port = getRemoteGDBPort();
 193     if (rgdb_enable && port) {
 194         RemoteGDB *rgdb = new RemoteGDB(this, tc);
 195         GDBListener *gdbl = new GDBListener(rgdb, port + id);
 196         gdbl->listen();
 197         /**
 198          * Uncommenting this line waits for a remote debugger to
 199          * connect to the simulator before continuing.
 200          */
 201         if (rgdb_wait != -1 && rgdb_wait == id)
 202             gdbl->accept();
 203
 204         if (remoteGDB.size() <= id) {
 205             remoteGDB.resize(id + 1);
 206         }
 207
 208         remoteGDB[id] = rgdb;
 209     }
 210
 211     return id;
 212 }
 213
 214 int
 215 System::numRunningContexts()
 216 {
 217     int running = 0;
 218     for (int i = 0; i < _numContexts; ++i) {
 219         if (threadContexts[i]->status() != ThreadContext::Halted)
 220             ++running;
 221     }
 222     return running;
 223 }
 224
 225 void
 226 System::startup()
 227 {
 228 #if FULL_SYSTEM
 229     int i;
 230     for (i = 0; i < threadContexts.size(); i++)
 231         TheISA::startupCPU(threadContexts[i], i);
 232 #endif
 233 }
 234
 235 void
 236 System::replaceThreadContext(ThreadContext *tc, int context_id)
 237 {
 238     if (context_id >= threadContexts.size()) {
 239         panic("replaceThreadContext: bad id, %d >= %d\n",
 240               context_id, threadContexts.size());
 241     }
 242
 243     threadContexts[context_id] = tc;
 244     if (context_id < remoteGDB.size())
 245         remoteGDB[context_id]->replaceThreadContext(tc);
 246 }
 247
 248 #if !FULL_SYSTEM
 249 Addr
 250 System::new_page()
 251 {
 252     Addr return_addr = page_ptr << LogVMPageSize;
 253     ++page_ptr;
 254     if (return_addr >= physmem->size())
 255         fatal("Out of memory, please increase size of physical memory.");
 256     return return_addr;
 257 }
 258
 259 Addr
 260 System::memSize()
 261 {
 262     return physmem->size();
 263 }
 264
 265 Addr
 266 System::freeMemSize()
 267 {
 268    return physmem->size() - (page_ptr << LogVMPageSize);
 269 }
 270
 271 #endif
 272
 273 void
 274 System::serialize(ostream &os)
 275 {
 276 #if FULL_SYSTEM
 277     kernelSymtab->serialize("kernel_symtab", os);
 278 #else // !FULL_SYSTEM
 279     SERIALIZE_SCALAR(page_ptr);
 280 #endif
 281 }
 282
 283
 284 void
 285 System::unserialize(Checkpoint *cp, const string &section)
 286 {
 287 #if FULL_SYSTEM
 288     kernelSymtab->unserialize("kernel_symtab", cp, section);
 289 #else // !FULL_SYSTEM
 290     UNSERIALIZE_SCALAR(page_ptr);
 291 #endif
 292 }
 293
 294 void
 295 System::printSystems()
 296 {
 297     vector<System *>::iterator i = systemList.begin();
 298     vector<System *>::iterator end = systemList.end();
 299     for (; i != end; ++i) {
 300         System *sys = *i;
 301         cerr << "System " << sys->name() << ": " << hex << sys << endl;
 302     }
 303 }
 304
 305 void
 306 printSystems()
 307 {
 308     System::printSystems();
 309 }
 310
 311 const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
 312     "timing"};
 313
 314 #if !FULL_SYSTEM
 315
 316 System *
 317 SystemParams::create()
 318 {
 319     return new System(this);
 320 }
 321
 322 #endif