simple_thread.cc revision 3675:dc883b610345 
1/*
2 * Copyright (c) 2001-2006 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 *          Nathan Binkert
30 *          Lisa Hsu
31 *          Kevin Lim
32 */
33
34#include <string>
35
36#include "arch/isa_traits.hh"
37#include "cpu/base.hh"
38#include "cpu/simple_thread.hh"
39#include "cpu/thread_context.hh"
40
41#if FULL_SYSTEM
42#include "arch/kernel_stats.hh"
43#include "base/callback.hh"
44#include "base/cprintf.hh"
45#include "base/output.hh"
46#include "base/trace.hh"
47#include "cpu/profile.hh"
48#include "cpu/quiesce_event.hh"
49#include "sim/serialize.hh"
50#include "sim/sim_exit.hh"
51#include "arch/stacktrace.hh"
52#else
53#include "sim/process.hh"
54#include "sim/system.hh"
55#include "mem/translating_port.hh"
56#endif
57
58using namespace std;
59
60// constructor
61#if FULL_SYSTEM
62SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
63                           TheISA::ITB *_itb, TheISA::DTB *_dtb,
64                           bool use_kernel_stats)
65    : ThreadState(_cpu, -1, _thread_num), cpu(_cpu), system(_sys), itb(_itb),
66      dtb(_dtb)
67
68{
69    tc = new ProxyThreadContext<SimpleThread>(this);
70
71    quiesceEvent = new EndQuiesceEvent(tc);
72
73    regs.clear();
74
75    if (cpu->params->profile) {
76        profile = new FunctionProfile(system->kernelSymtab);
77        Callback *cb =
78            new MakeCallback<SimpleThread,
79            &SimpleThread::dumpFuncProfile>(this);
80        registerExitCallback(cb);
81    }
82
83    // let's fill with a dummy node for now so we don't get a segfault
84    // on the first cycle when there's no node available.
85    static ProfileNode dummyNode;
86    profileNode = &dummyNode;
87    profilePC = 3;
88
89    if (use_kernel_stats) {
90        kernelStats = new TheISA::Kernel::Statistics(system);
91    } else {
92        kernelStats = NULL;
93    }
94}
95#else
96SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num,
97                         Process *_process, int _asid)
98    : ThreadState(_cpu, -1, _thread_num, _process, _asid),
99      cpu(_cpu)
100{
101    regs.clear();
102    tc = new ProxyThreadContext<SimpleThread>(this);
103}
104
105#endif
106
107SimpleThread::SimpleThread()
108#if FULL_SYSTEM
109    : ThreadState(NULL, -1, -1)
110#else
111    : ThreadState(NULL, -1, -1, NULL, -1)
112#endif
113{
114    tc = new ProxyThreadContext<SimpleThread>(this);
115    regs.clear();
116}
117
118SimpleThread::~SimpleThread()
119{
120#if FULL_SYSTEM
121    delete physPort;
122    delete virtPort;
123#endif
124    delete tc;
125}
126
127void
128SimpleThread::takeOverFrom(ThreadContext *oldContext)
129{
130    // some things should already be set up
131#if FULL_SYSTEM
132    assert(system == oldContext->getSystemPtr());
133#else
134    assert(process == oldContext->getProcessPtr());
135#endif
136
137    copyState(oldContext);
138#if FULL_SYSTEM
139    EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
140    if (quiesce) {
141        // Point the quiesce event's TC at this TC so that it wakes up
142        // the proper CPU.
143        quiesce->tc = tc;
144    }
145    if (quiesceEvent) {
146        quiesceEvent->tc = tc;
147    }
148
149    TheISA::Kernel::Statistics *stats = oldContext->getKernelStats();
150    if (stats) {
151        kernelStats = stats;
152    }
153#endif
154
155    storeCondFailures = 0;
156
157    oldContext->setStatus(ThreadContext::Unallocated);
158}
159
160void
161SimpleThread::copyTC(ThreadContext *context)
162{
163    copyState(context);
164
165#if FULL_SYSTEM
166    EndQuiesceEvent *quiesce = context->getQuiesceEvent();
167    if (quiesce) {
168        quiesceEvent = quiesce;
169    }
170    TheISA::Kernel::Statistics *stats = context->getKernelStats();
171    if (stats) {
172        kernelStats = stats;
173    }
174#endif
175}
176
177void
178SimpleThread::copyState(ThreadContext *oldContext)
179{
180    // copy over functional state
181    _status = oldContext->status();
182    copyArchRegs(oldContext);
183    cpuId = oldContext->readCpuId();
184#if !FULL_SYSTEM
185    funcExeInst = oldContext->readFuncExeInst();
186#endif
187    inst = oldContext->getInst();
188}
189
190void
191SimpleThread::serialize(ostream &os)
192{
193    ThreadState::serialize(os);
194    regs.serialize(os);
195    // thread_num and cpu_id are deterministic from the config
196}
197
198
199void
200SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
201{
202    ThreadState::unserialize(cp, section);
203    regs.unserialize(cp, section);
204    // thread_num and cpu_id are deterministic from the config
205}
206
207#if FULL_SYSTEM
208void
209SimpleThread::dumpFuncProfile()
210{
211    std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
212    profile->dump(tc, *os);
213}
214#endif
215
216void
217SimpleThread::activate(int delay)
218{
219    if (status() == ThreadContext::Active)
220        return;
221
222    lastActivate = curTick;
223
224    if (status() == ThreadContext::Unallocated) {
225        cpu->activateWhenReady(tid);
226        return;
227    }
228
229    _status = ThreadContext::Active;
230
231    // status() == Suspended
232    cpu->activateContext(tid, delay);
233}
234
235void
236SimpleThread::suspend()
237{
238    if (status() == ThreadContext::Suspended)
239        return;
240
241    lastActivate = curTick;
242    lastSuspend = curTick;
243/*
244#if FULL_SYSTEM
245    // Don't change the status from active if there are pending interrupts
246    if (cpu->check_interrupts()) {
247        assert(status() == ThreadContext::Active);
248        return;
249    }
250#endif
251*/
252    _status = ThreadContext::Suspended;
253    cpu->suspendContext(tid);
254}
255
256void
257SimpleThread::deallocate()
258{
259    if (status() == ThreadContext::Unallocated)
260        return;
261
262    _status = ThreadContext::Unallocated;
263    cpu->deallocateContext(tid);
264}
265
266void
267SimpleThread::halt()
268{
269    if (status() == ThreadContext::Halted)
270        return;
271
272    _status = ThreadContext::Halted;
273    cpu->haltContext(tid);
274}
275
276
277void
278SimpleThread::regStats(const string &name)
279{
280#if FULL_SYSTEM
281    if (kernelStats)
282        kernelStats->regStats(name + ".kern");
283#endif
284}
285
286void
287SimpleThread::copyArchRegs(ThreadContext *src_tc)
288{
289    TheISA::copyRegs(src_tc, tc);
290}
291
292#if FULL_SYSTEM
293VirtualPort*
294SimpleThread::getVirtPort(ThreadContext *src_tc)
295{
296    if (!src_tc)
297        return virtPort;
298
299    VirtualPort *vp = new VirtualPort("tc-vport", src_tc);
300    connectToMemFunc(vp);
301    return vp;
302}
303
304void
305SimpleThread::delVirtPort(VirtualPort *vp)
306{
307    if (vp != virtPort) {
308        delete vp->getPeer();
309        delete vp;
310    }
311}
312
313#endif
314
315