simple_thread.cc revision 716
1/* 2 * Copyright (c) 2003 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 29#include <string> 30 31#include "cpu/base_cpu.hh" 32#include "cpu/exec_context.hh" 33 34#ifdef FULL_SYSTEM 35#include "sim/system.hh" 36#else 37#include "sim/process.hh" 38#endif 39 40using namespace std; 41 42// constructor 43#ifdef FULL_SYSTEM 44ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys, 45 AlphaITB *_itb, AlphaDTB *_dtb, 46 FunctionalMemory *_mem) 47 : _status(ExecContext::Unallocated), 48 kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num), 49 cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys), 50 memCtrl(_sys->memCtrl), physmem(_sys->physmem), 51 swCtx(NULL), func_exe_inst(0), storeCondFailures(0) 52{ 53 memset(®s, 0, sizeof(RegFile)); 54} 55#else 56ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, 57 Process *_process, int _asid) 58 : _status(ExecContext::Unallocated), 59 cpu(_cpu), thread_num(_thread_num), cpu_id(-1), 60 process(_process), mem(process->getMemory()), asid(_asid), 61 func_exe_inst(0), storeCondFailures(0) 62{ 63 memset(®s, 0, sizeof(RegFile)); 64} 65 66ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, 67 FunctionalMemory *_mem, int _asid) 68 : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid), 69 func_exe_inst(0), storeCondFailures(0) 70{ 71 memset(®s, 0, sizeof(RegFile)); 72} 73#endif 74 75 76void 77ExecContext::takeOverFrom(ExecContext *oldContext) 78{ 79 // some things should already be set up 80 assert(mem == oldContext->mem); 81#ifdef FULL_SYSTEM 82 assert(system == oldContext->system); 83#else 84 assert(process == oldContext->process); 85#endif 86 87 // copy over functional state 88 _status = oldContext->_status; 89#ifdef FULL_SYSTEM 90 kernelStats = oldContext->kernelStats; 91#endif 92 regs = oldContext->regs; 93 cpu_id = oldContext->cpu_id; 94 func_exe_inst = oldContext->func_exe_inst; 95 96 storeCondFailures = 0; 97 98 oldContext->_status = ExecContext::Unallocated; 99} 100 101 102void 103ExecContext::serialize(ostream &os) 104{ 105 SERIALIZE_ENUM(_status); 106 regs.serialize(os); 107 // thread_num and cpu_id are deterministic from the config 108 SERIALIZE_SCALAR(func_exe_inst); 109 SERIALIZE_SCALAR(inst); 110 111#ifdef FULL_SYSTEM 112 bool ctx = false; 113 if (swCtx) { 114 ctx = true; 115 SERIALIZE_SCALAR(ctx); 116 SERIALIZE_SCALAR(swCtx->calls); 117 std::stack<fnCall *> *stack = &(swCtx->callStack); 118 fnCall *top; 119 int size = stack->size(); 120 SERIALIZE_SCALAR(size); 121 122 for (int j=0; j<size; ++j) { 123 top = stack->top(); 124 paramOut(os, csprintf("stackpos[%d]",j), top->name); 125 delete top; 126 stack->pop(); 127 } 128 } else { 129 SERIALIZE_SCALAR(ctx); 130 } 131 if (system->bin) { 132 Statistics::MainBin *cur = Statistics::MainBin::curBin(); 133 string bin_name = cur->name(); 134 SERIALIZE_SCALAR(bin_name); 135 } 136#endif //FULL_SYSTEM 137} 138 139 140void 141ExecContext::unserialize(Checkpoint *cp, const std::string §ion) 142{ 143 UNSERIALIZE_ENUM(_status); 144 regs.unserialize(cp, section); 145 // thread_num and cpu_id are deterministic from the config 146 UNSERIALIZE_SCALAR(func_exe_inst); 147 UNSERIALIZE_SCALAR(inst); 148 149#ifdef FULL_SYSTEM 150 bool ctx; 151 UNSERIALIZE_SCALAR(ctx); 152 if (ctx) { 153 swCtx = new SWContext; 154 UNSERIALIZE_SCALAR(swCtx->calls); 155 int size; 156 UNSERIALIZE_SCALAR(size); 157 158 vector<fnCall *> calls; 159 fnCall *call; 160 for (int i=0; i<size; ++i) { 161 call = new fnCall; 162 paramIn(cp, section, csprintf("stackpos[%d]",i), call->name); 163 call->myBin = system->getBin(call->name); 164 calls.push_back(call); 165 } 166 167 for (int i=size-1; i>=0; --i) { 168 swCtx->callStack.push(calls[i]); 169 } 170 171 } 172 173 if (system->bin) { 174 string bin_name; 175 UNSERIALIZE_SCALAR(bin_name); 176 system->getBin(bin_name)->activate(); 177 } 178#endif //FULL_SYSTEM 179} 180 181 182void 183ExecContext::activate(int delay) 184{ 185 if (status() == Active) 186 return; 187 188 _status = Active; 189 cpu->activateContext(thread_num, delay); 190} 191 192void 193ExecContext::suspend() 194{ 195 if (status() == Suspended) 196 return; 197 198#ifdef FULL_SYSTEM 199 // Don't change the status from active if there are pending interrupts 200 if (cpu->check_interrupts()) { 201 assert(status() == Active); 202 return; 203 } 204#endif 205 206 _status = Suspended; 207 cpu->suspendContext(thread_num); 208} 209 210void 211ExecContext::deallocate() 212{ 213 if (status() == Unallocated) 214 return; 215 216 _status = Unallocated; 217 cpu->deallocateContext(thread_num); 218} 219 220void 221ExecContext::halt() 222{ 223 if (status() == Halted) 224 return; 225 226 _status = Halted; 227 cpu->haltContext(thread_num); 228} 229 230 231void 232ExecContext::regStats(const string &name) 233{ 234#ifdef FULL_SYSTEM 235 kernelStats.regStats(name + ".kern"); 236#endif 237} 238 239void 240ExecContext::trap(Fault fault) 241{ 242 //TheISA::trap(fault); //One possible way to do it... 243 244 /** @todo: Going to hack it for now. Do a true fixup later. */ 245#ifdef FULL_SYSTEM 246 ev5_trap(fault); 247#else 248 fatal("fault (%d) detected @ PC 0x%08p", fault, readPC()); 249#endif 250} 251