simple_thread.cc revision 2188 
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
29#include <string>
30
31#include "cpu/base.hh"
32#include "cpu/exec_context.hh"
33
34#if FULL_SYSTEM
35#include "base/callback.hh"
36#include "base/cprintf.hh"
37#include "base/output.hh"
38#include "base/trace.hh"
39#include "cpu/profile.hh"
40#include "kern/kernel_stats.hh"
41#include "sim/serialize.hh"
42#include "sim/sim_exit.hh"
43#include "sim/system.hh"
44#include "targetarch/stacktrace.hh"
45#else
46#include "sim/process.hh"
47#endif
48
49using namespace std;
50
51// constructor
52#if FULL_SYSTEM
53ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
54                         AlphaITB *_itb, AlphaDTB *_dtb,
55                         FunctionalMemory *_mem)
56    : _status(ExecContext::Unallocated), cpu(_cpu), thread_num(_thread_num),
57      cpu_id(-1), lastActivate(0), lastSuspend(0), mem(_mem), itb(_itb),
58      dtb(_dtb), system(_sys), memctrl(_sys->memctrl), physmem(_sys->physmem),
59      kernelBinning(system->kernelBinning), bin(kernelBinning->bin),
60      fnbin(kernelBinning->fnbin), profile(NULL), quiesceEvent(this),
61      func_exe_inst(0), storeCondFailures(0)
62{
63    kernelStats = new Kernel::Statistics(this);
64    memset(&regs, 0, sizeof(RegFile));
65
66    if (cpu->params->profile) {
67        profile = new FunctionProfile(system->kernelSymtab);
68        Callback *cb =
69            new MakeCallback<ExecContext, &ExecContext::dumpFuncProfile>(this);
70        registerExitCallback(cb);
71    }
72
73    // let's fill with a dummy node for now so we don't get a segfault
74    // on the first cycle when there's no node available.
75    static ProfileNode dummyNode;
76    profileNode = &dummyNode;
77    profilePC = 3;
78}
79#else
80ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
81                         Process *_process, int _asid)
82    : _status(ExecContext::Unallocated),
83      cpu(_cpu), thread_num(_thread_num), cpu_id(-1), lastActivate(0),
84      lastSuspend(0), process(_process), mem(process->getMemory()), asid(_asid),
85      func_exe_inst(0), storeCondFailures(0)
86{
87    memset(&regs, 0, sizeof(RegFile));
88}
89
90ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
91                         FunctionalMemory *_mem, int _asid)
92    : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
93      func_exe_inst(0), storeCondFailures(0)
94{
95    memset(&regs, 0, sizeof(RegFile));
96}
97#endif
98
99ExecContext::~ExecContext()
100{
101#if FULL_SYSTEM
102    delete kernelStats;
103#endif
104}
105
106#if FULL_SYSTEM
107void
108ExecContext::dumpFuncProfile()
109{
110    std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
111    profile->dump(this, *os);
112}
113
114ExecContext::EndQuiesceEvent::EndQuiesceEvent(ExecContext *_xc)
115    : Event(&mainEventQueue), xc(_xc)
116{
117}
118
119void
120ExecContext::EndQuiesceEvent::process()
121{
122    xc->activate();
123}
124
125const char*
126ExecContext::EndQuiesceEvent::description()
127{
128    return "End Quiesce Event.";
129}
130#endif
131
132void
133ExecContext::takeOverFrom(ExecContext *oldContext)
134{
135    // some things should already be set up
136    assert(mem == oldContext->mem);
137#if FULL_SYSTEM
138    assert(system == oldContext->system);
139#else
140    assert(process == oldContext->process);
141#endif
142
143    // copy over functional state
144    _status = oldContext->_status;
145    regs = oldContext->regs;
146    cpu_id = oldContext->cpu_id;
147    func_exe_inst = oldContext->func_exe_inst;
148
149    storeCondFailures = 0;
150
151    oldContext->_status = ExecContext::Unallocated;
152}
153
154void
155ExecContext::serialize(ostream &os)
156{
157    SERIALIZE_ENUM(_status);
158    regs.serialize(os);
159    // thread_num and cpu_id are deterministic from the config
160    SERIALIZE_SCALAR(func_exe_inst);
161    SERIALIZE_SCALAR(inst);
162
163#if FULL_SYSTEM
164    Tick quiesceEndTick = 0;
165    if (quiesceEvent.scheduled())
166        quiesceEndTick = quiesceEvent.when();
167    SERIALIZE_SCALAR(quiesceEndTick);
168    kernelStats->serialize(os);
169
170#endif
171}
172
173
174void
175ExecContext::unserialize(Checkpoint *cp, const std::string &section)
176{
177    UNSERIALIZE_ENUM(_status);
178    regs.unserialize(cp, section);
179    // thread_num and cpu_id are deterministic from the config
180    UNSERIALIZE_SCALAR(func_exe_inst);
181    UNSERIALIZE_SCALAR(inst);
182
183#if FULL_SYSTEM
184    Tick quiesceEndTick;
185    UNSERIALIZE_SCALAR(quiesceEndTick);
186    if (quiesceEndTick)
187        quiesceEvent.schedule(quiesceEndTick);
188
189    kernelStats->unserialize(cp, section);
190#endif
191}
192
193
194void
195ExecContext::activate(int delay)
196{
197    if (status() == Active)
198        return;
199
200    lastActivate = curTick;
201
202    _status = Active;
203    cpu->activateContext(thread_num, delay);
204}
205
206void
207ExecContext::suspend()
208{
209    if (status() == Suspended)
210        return;
211
212    lastActivate = curTick;
213    lastSuspend = curTick;
214/*
215#if FULL_SYSTEM
216    // Don't change the status from active if there are pending interrupts
217    if (cpu->check_interrupts()) {
218        assert(status() == Active);
219        return;
220    }
221#endif
222*/
223    _status = Suspended;
224    cpu->suspendContext(thread_num);
225}
226
227void
228ExecContext::deallocate()
229{
230    if (status() == Unallocated)
231        return;
232
233    _status = Unallocated;
234    cpu->deallocateContext(thread_num);
235}
236
237void
238ExecContext::halt()
239{
240    if (status() == Halted)
241        return;
242
243    _status = Halted;
244    cpu->haltContext(thread_num);
245}
246
247
248void
249ExecContext::regStats(const string &name)
250{
251#if FULL_SYSTEM
252    kernelStats->regStats(name + ".kern");
253#endif
254}
255
256void
257ExecContext::trap(Fault fault)
258{
259    //TheISA::trap(fault);    //One possible way to do it...
260
261    /** @todo: Going to hack it for now.  Do a true fixup later. */
262#if FULL_SYSTEM
263    ev5_trap(fault);
264#else
265    fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
266#endif
267}
268