simple_thread.cc revision 393
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#ifdef FS_MEASURE 52 swCtx(NULL), 53#endif 54 func_exe_insn(0), storeCondFailures(0) 55{ 56 memset(®s, 0, sizeof(RegFile)); 57} 58#else 59ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, 60 Process *_process, int _asid) 61 : _status(ExecContext::Unallocated), 62 cpu(_cpu), thread_num(_thread_num), cpu_id(-1), 63 process(_process), mem(process->getMemory()), asid(_asid), 64 func_exe_insn(0), storeCondFailures(0) 65{ 66} 67 68ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, 69 FunctionalMemory *_mem, int _asid) 70 : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid), 71 func_exe_insn(0), storeCondFailures(0) 72{ 73} 74#endif 75 76 77void 78ExecContext::takeOverFrom(ExecContext *oldContext) 79{ 80 // some things should already be set up 81 assert(mem == oldContext->mem); 82#ifdef FULL_SYSTEM 83 assert(system == oldContext->system); 84#else 85 assert(process == oldContext->process); 86#endif 87 88 // copy over functional state 89 _status = oldContext->_status; 90#ifdef FULL_SYSTEM 91 kernelStats = oldContext->kernelStats; 92#endif 93 regs = oldContext->regs; 94 cpu_id = oldContext->cpu_id; 95 func_exe_insn = oldContext->func_exe_insn; 96 97 storeCondFailures = 0; 98 99 oldContext->_status = ExecContext::Unallocated; 100} 101 102 103void 104ExecContext::serialize(ostream &os) 105{ 106 SERIALIZE_ENUM(_status); 107 regs.serialize(os); 108 // thread_num and cpu_id are deterministic from the config 109 SERIALIZE_SCALAR(func_exe_insn); 110} 111 112 113void 114ExecContext::unserialize(Checkpoint *cp, const std::string §ion) 115{ 116 UNSERIALIZE_ENUM(_status); 117 regs.unserialize(cp, section); 118 // thread_num and cpu_id are deterministic from the config 119 UNSERIALIZE_SCALAR(func_exe_insn); 120} 121 122 123void 124ExecContext::activate(int delay) 125{ 126 if (status() == Active) 127 return; 128 129 _status = Active; 130 cpu->activateContext(thread_num, delay); 131} 132 133void 134ExecContext::suspend() 135{ 136 if (status() == Suspended) 137 return; 138 139#ifdef FULL_SYSTEM 140 // Don't change the status from active if there are pending interrupts 141 if (cpu->check_interrupts()) { 142 assert(status() == Active); 143 return; 144 } 145#endif 146 147 _status = Suspended; 148 cpu->suspendContext(thread_num); 149} 150 151void 152ExecContext::deallocate() 153{ 154 if (status() == Unallocated) 155 return; 156 157 _status = Unallocated; 158 cpu->deallocateContext(thread_num); 159} 160 161void 162ExecContext::halt() 163{ 164 if (status() == Halted) 165 return; 166 167 _status = Halted; 168 cpu->haltContext(thread_num); 169} 170 171 172void 173ExecContext::regStats(const string &name) 174{ 175#ifdef FULL_SYSTEM 176 kernelStats.regStats(name + ".kern"); 177#endif 178} 179