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 "config/full_system.hh"
  42 #include "config/the_isa.hh"
  43 #include "mem/mem_object.hh"
  44 #include "mem/physical.hh"
  45 #include "sim/byteswap.hh"
  46 #include "sim/system.hh"
  47 #include "sim/debug.hh"
  48
  49 #if FULL_SYSTEM
  50 #include "arch/vtophys.hh"
  51 #include "kern/kernel_stats.hh"
  52 #else
  53 #include "params/System.hh"
  54 #endif
  55
  56 using namespace std;
  57 using namespace TheISA;
  58
  59 vector<System *> System::systemList;
  60
  61 int System::numSystemsRunning = 0;
  62
  63 System::System(Params *p)
  64     : SimObject(p), physmem(p->physmem), _numContexts(0),
  65 #if FULL_SYSTEM
  66       init_param(p->init_param),
  67       functionalPort(p->name + "-fport"),
  68       virtPort(p->name + "-vport"),
  69 #else
  70       page_ptr(0),
  71       next_PID(0),
  72 #endif
  73       memoryMode(p->mem_mode), _params(p)
  74 {
  75     // add self to global system list
  76     systemList.push_back(this);
  77
  78 #if FULL_SYSTEM
  79     kernelSymtab = new SymbolTable;
  80     if (!debugSymbolTable)
  81         debugSymbolTable = new SymbolTable;
  82
  83
  84     /**
  85      * Get a functional port to memory
  86      */
  87     Port *mem_port;
  88     mem_port = physmem->getPort("functional");
  89     functionalPort.setPeer(mem_port);
  90     mem_port->setPeer(&functionalPort);
  91
  92     mem_port = physmem->getPort("functional");
  93     virtPort.setPeer(mem_port);
  94     mem_port->setPeer(&virtPort);
  95
  96
  97     /**
  98      * Load the kernel code into memory
  99      */
 100     if (params()->kernel == "") {
 101         inform("No kernel set for full system simulation. Assuming you know what"
 102                 " you're doing...\n");
 103     } else {
 104         // Load kernel code
 105         kernel = createObjectFile(params()->kernel);
 106         inform("kernel located at: %s", params()->kernel);
 107
 108         if (kernel == NULL)
 109             fatal("Could not load kernel file %s", params()->kernel);
 110
 111         // Load program sections into memory
 112         kernel->loadSections(&functionalPort, LoadAddrMask);
 113
 114         // setup entry points
 115         kernelStart = kernel->textBase();
 116         kernelEnd = kernel->bssBase() + kernel->bssSize();
 117         kernelEntry = kernel->entryPoint();
 118
 119         // load symbols
 120         if (!kernel->loadGlobalSymbols(kernelSymtab))
 121             fatal("could not load kernel symbols\n");
 122
 123         if (!kernel->loadLocalSymbols(kernelSymtab))
 124             fatal("could not load kernel local symbols\n");
 125
 126         if (!kernel->loadGlobalSymbols(debugSymbolTable))
 127             fatal("could not load kernel symbols\n");
 128
 129         if (!kernel->loadLocalSymbols(debugSymbolTable))
 130             fatal("could not load kernel local symbols\n");
 131
 132         DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
 133         DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
 134         DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
 135         DPRINTF(Loader, "Kernel loaded...\n");
 136     }
 137 #endif // FULL_SYSTEM
 138
 139     // increment the number of running systms
 140     numSystemsRunning++;
 141 }
 142
 143 System::~System()
 144 {
 145 #if FULL_SYSTEM
 146     delete kernelSymtab;
 147     delete kernel;
 148 #else
 149     panic("System::fixFuncEventAddr needs to be rewritten "
 150           "to work with syscall emulation");
 151 #endif // FULL_SYSTEM}
 152 }
 153
 154 int rgdb_wait = -1;
 155 int rgdb_enable = true;
 156
 157 void
 158 System::setMemoryMode(Enums::MemoryMode mode)
 159 {
 160     assert(getState() == Drained);
 161     memoryMode = mode;
 162 }
 163
 164 bool System::breakpoint()
 165 {
 166     if (remoteGDB.size())
 167         return remoteGDB[0]->breakpoint();
 168     return false;
 169 }
 170
 171 int
 172 System::registerThreadContext(ThreadContext *tc, int assigned)
 173 {
 174     int id;
 175     if (assigned == -1) {
 176         for (id = 0; id < threadContexts.size(); id++) {
 177             if (!threadContexts[id])
 178                 break;
 179         }
 180
 181         if (threadContexts.size() <= id)
 182             threadContexts.resize(id + 1);
 183     } else {
 184         if (threadContexts.size() <= assigned)
 185             threadContexts.resize(assigned + 1);
 186         id = assigned;
 187     }
 188
 189     if (threadContexts[id])
 190         fatal("Cannot have two CPUs with the same id (%d)\n", id);
 191
 192     threadContexts[id] = tc;
 193     _numContexts++;
 194
 195     int port = getRemoteGDBPort();
 196     if (rgdb_enable && port) {
 197         RemoteGDB *rgdb = new RemoteGDB(this, tc);
 198         GDBListener *gdbl = new GDBListener(rgdb, port + id);
 199         gdbl->listen();
 200         /**
 201          * Uncommenting this line waits for a remote debugger to
 202          * connect to the simulator before continuing.
 203          */
 204         if (rgdb_wait != -1 && rgdb_wait == id)
 205             gdbl->accept();
 206
 207         if (remoteGDB.size() <= id) {
 208             remoteGDB.resize(id + 1);
 209         }
 210
 211         remoteGDB[id] = rgdb;
 212     }
 213
 214     return id;
 215 }
 216
 217 int
 218 System::numRunningContexts()
 219 {
 220     int running = 0;
 221     for (int i = 0; i < _numContexts; ++i) {
 222         if (threadContexts[i]->status() != ThreadContext::Halted)
 223             ++running;
 224     }
 225     return running;
 226 }
 227
 228 void
 229 System::startup()
 230 {
 231 #if FULL_SYSTEM
 232     int i;
 233     for (i = 0; i < threadContexts.size(); i++)
 234         TheISA::startupCPU(threadContexts[i], i);
 235 #endif
 236 }
 237
 238 void
 239 System::replaceThreadContext(ThreadContext *tc, int context_id)
 240 {
 241     if (context_id >= threadContexts.size()) {
 242         panic("replaceThreadContext: bad id, %d >= %d\n",
 243               context_id, threadContexts.size());
 244     }
 245
 246     threadContexts[context_id] = tc;
 247     if (context_id < remoteGDB.size())
 248         remoteGDB[context_id]->replaceThreadContext(tc);
 249 }
 250
 251 #if !FULL_SYSTEM
 252 Addr
 253 System::new_page()
 254 {
 255     Addr return_addr = page_ptr << LogVMPageSize;
 256     ++page_ptr;
 257     if (return_addr >= physmem->size())
 258         fatal("Out of memory, please increase size of physical memory.");
 259     return return_addr;
 260 }
 261
 262 Addr
 263 System::memSize()
 264 {
 265     return physmem->size();
 266 }
 267
 268 Addr
 269 System::freeMemSize()
 270 {
 271    return physmem->size() - (page_ptr << LogVMPageSize);
 272 }
 273
 274 #endif
 275
 276 void
 277 System::serialize(ostream &os)
 278 {
 279 #if FULL_SYSTEM
 280     kernelSymtab->serialize("kernel_symtab", os);
 281 #else // !FULL_SYSTEM
 282     SERIALIZE_SCALAR(page_ptr);
 283 #endif
 284 }
 285
 286
 287 void
 288 System::unserialize(Checkpoint *cp, const string &section)
 289 {
 290 #if FULL_SYSTEM
 291     kernelSymtab->unserialize("kernel_symtab", cp, section);
 292 #else // !FULL_SYSTEM
 293     UNSERIALIZE_SCALAR(page_ptr);
 294 #endif
 295 }
 296
 297 void
 298 System::printSystems()
 299 {
 300     vector<System *>::iterator i = systemList.begin();
 301     vector<System *>::iterator end = systemList.end();
 302     for (; i != end; ++i) {
 303         System *sys = *i;
 304         cerr << "System " << sys->name() << ": " << hex << sys << endl;
 305     }
 306 }
 307
 308 void
 309 printSystems()
 310 {
 311     System::printSystems();
 312 }
 313
 314 const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
 315     "timing"};
 316
 317 #if !FULL_SYSTEM
 318
 319 System *
 320 SystemParams::create()
 321 {
 322     return new System(this);
 323 }
 324
 325 #endif