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 "base/loader/object_file.hh"
  36 #include "base/loader/symtab.hh"
  37 #include "base/trace.hh"
  38 #include "cpu/thread_context.hh"
  39 #include "mem/mem_object.hh"
  40 #include "mem/physical.hh"
  41 #include "sim/builder.hh"
  42 #include "sim/byteswap.hh"
  43 #include "sim/system.hh"
  44 #if FULL_SYSTEM
  45 #include "arch/vtophys.hh"
  46 #include "base/remote_gdb.hh"
  47 #include "kern/kernel_stats.hh"
  48 #endif
  49
  50 using namespace std;
  51 using namespace TheISA;
  52
  53 vector<System *> System::systemList;
  54
  55 int System::numSystemsRunning = 0;
  56
  57 System::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       _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     // Load kernel code
  93     kernel = createObjectFile(params()->kernel_path);
  94     if (kernel == NULL)
  95         fatal("Could not load kernel file %s", params()->kernel_path);
  96
  97     // Load program sections into memory
  98     kernel->loadSections(&functionalPort, LoadAddrMask);
  99
 100     // setup entry points
 101     kernelStart = kernel->textBase();
 102     kernelEnd = kernel->bssBase() + kernel->bssSize();
 103     kernelEntry = kernel->entryPoint();
 104
 105     // load symbols
 106     if (!kernel->loadGlobalSymbols(kernelSymtab))
 107         panic("could not load kernel symbols\n");
 108
 109     if (!kernel->loadLocalSymbols(kernelSymtab))
 110         panic("could not load kernel local symbols\n");
 111
 112     if (!kernel->loadGlobalSymbols(debugSymbolTable))
 113         panic("could not load kernel symbols\n");
 114
 115     if (!kernel->loadLocalSymbols(debugSymbolTable))
 116         panic("could not load kernel local symbols\n");
 117
 118     DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
 119     DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
 120     DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
 121     DPRINTF(Loader, "Kernel loaded...\n");
 122 #endif // FULL_SYSTEM
 123
 124     // increment the number of running systms
 125     numSystemsRunning++;
 126 }
 127
 128 System::~System()
 129 {
 130 #if FULL_SYSTEM
 131     delete kernelSymtab;
 132     delete kernel;
 133 #else
 134     panic("System::fixFuncEventAddr needs to be rewritten "
 135           "to work with syscall emulation");
 136 #endif // FULL_SYSTEM}
 137 }
 138
 139 #if FULL_SYSTEM
 140
 141
 142 int rgdb_wait = -1;
 143
 144 #endif // FULL_SYSTEM
 145
 146 int
 147 System::registerThreadContext(ThreadContext *tc, int id)
 148 {
 149     if (id == -1) {
 150         for (id = 0; id < threadContexts.size(); id++) {
 151             if (!threadContexts[id])
 152                 break;
 153         }
 154     }
 155
 156     if (threadContexts.size() <= id)
 157         threadContexts.resize(id + 1);
 158
 159     if (threadContexts[id])
 160         panic("Cannot have two CPUs with the same id (%d)\n", id);
 161
 162     threadContexts[id] = tc;
 163     numcpus++;
 164
 165 #if FULL_SYSTEM
 166     RemoteGDB *rgdb = new RemoteGDB(this, tc);
 167     GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
 168     gdbl->listen();
 169     /**
 170      * Uncommenting this line waits for a remote debugger to connect
 171      * to the simulator before continuing.
 172      */
 173     if (rgdb_wait != -1 && rgdb_wait == id)
 174         gdbl->accept();
 175
 176     if (remoteGDB.size() <= id) {
 177         remoteGDB.resize(id + 1);
 178     }
 179
 180     remoteGDB[id] = rgdb;
 181 #endif // FULL_SYSTEM
 182
 183     return id;
 184 }
 185
 186 void
 187 System::startup()
 188 {
 189     int i;
 190     for (i = 0; i < threadContexts.size(); i++)
 191         threadContexts[i]->activate(0);
 192 }
 193
 194 void
 195 System::replaceThreadContext(ThreadContext *tc, int id)
 196 {
 197     if (id >= threadContexts.size()) {
 198         panic("replaceThreadContext: bad id, %d >= %d\n",
 199               id, threadContexts.size());
 200     }
 201
 202     threadContexts[id] = tc;
 203 #if FULL_SYSTEM
 204     remoteGDB[id]->replaceThreadContext(tc);
 205 #endif // FULL_SYSTEM
 206 }
 207
 208 #if !FULL_SYSTEM
 209 Addr
 210 System::new_page()
 211 {
 212     Addr return_addr = page_ptr << LogVMPageSize;
 213     ++page_ptr;
 214     return return_addr;
 215 }
 216 #endif
 217
 218 void
 219 System::serialize(ostream &os)
 220 {
 221 #if FULL_SYSTEM
 222     kernelSymtab->serialize("kernel_symtab", os);
 223 #endif // FULL_SYSTEM
 224 }
 225
 226
 227 void
 228 System::unserialize(Checkpoint *cp, const string &section)
 229 {
 230 #if FULL_SYSTEM
 231     kernelSymtab->unserialize("kernel_symtab", cp, section);
 232 #endif // FULL_SYSTEM
 233 }
 234
 235 void
 236 System::printSystems()
 237 {
 238     vector<System *>::iterator i = systemList.begin();
 239     vector<System *>::iterator end = systemList.end();
 240     for (; i != end; ++i) {
 241         System *sys = *i;
 242         cerr << "System " << sys->name() << ": " << hex << sys << endl;
 243     }
 244 }
 245
 246 void
 247 printSystems()
 248 {
 249     System::printSystems();
 250 }
 251
 252 #if FULL_SYSTEM
 253
 254 // In full system mode, only derived classes (e.g. AlphaLinuxSystem)
 255 // can be created directly.
 256
 257 DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
 258
 259 #else
 260
 261 BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
 262
 263     SimObjectParam<PhysicalMemory *> physmem;
 264
 265 END_DECLARE_SIM_OBJECT_PARAMS(System)
 266
 267 BEGIN_INIT_SIM_OBJECT_PARAMS(System)
 268
 269     INIT_PARAM(physmem, "physical memory")
 270
 271 END_INIT_SIM_OBJECT_PARAMS(System)
 272
 273 CREATE_SIM_OBJECT(System)
 274 {
 275     System::Params *p = new System::Params;
 276     p->name = getInstanceName();
 277     p->physmem = physmem;
 278     return new System(p);
 279 }
 280
 281 REGISTER_SIM_OBJECT("System", System)
 282
 283 #endif