simple_thread.cc revision 2420 
1/*
2 * Copyright (c) 2001-2005 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 "cpu/profile.hh"
39#include "kern/kernel_stats.hh"
40#include "sim/serialize.hh"
41#include "sim/sim_exit.hh"
42#include "sim/system.hh"
43#include "targetarch/stacktrace.hh"
44#else
45#include "sim/process.hh"
46#include "mem/translating_port.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                         Memory *_mem)
56    : _status(ExecContext::Unallocated), cpu(_cpu), thread_num(_thread_num),
57      cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
58      memctrl(_sys->memctrl), physmem(_sys->physmem),
59      kernelBinning(system->kernelBinning), bin(kernelBinning->bin),
60      fnbin(kernelBinning->fnbin), profile(NULL),
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, Port *mem_port)
82    : _status(ExecContext::Unallocated),
83      cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
84      process(_process),
85      asid(_asid),
86      func_exe_inst(0), storeCondFailures(0)
87{
88    port = new TranslatingPort(mem_port, process->pTable);
89    memset(&regs, 0, sizeof(RegFile));
90}
91#endif
92
93ExecContext::~ExecContext()
94{
95#if FULL_SYSTEM
96    delete kernelStats;
97#endif
98}
99
100#if FULL_SYSTEM
101void
102ExecContext::dumpFuncProfile()
103{
104    std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
105    profile->dump(this, *os);
106}
107#endif
108
109void
110ExecContext::takeOverFrom(ExecContext *oldContext)
111{
112    // some things should already be set up
113//    assert(mem == oldContext->mem);
114#if FULL_SYSTEM
115    assert(system == oldContext->system);
116#else
117    assert(process == oldContext->process);
118#endif
119
120    // copy over functional state
121    _status = oldContext->_status;
122    regs = oldContext->regs;
123    cpu_id = oldContext->cpu_id;
124    func_exe_inst = oldContext->func_exe_inst;
125
126    storeCondFailures = 0;
127
128    oldContext->_status = ExecContext::Unallocated;
129}
130
131void
132ExecContext::serialize(ostream &os)
133{
134    SERIALIZE_ENUM(_status);
135    regs.serialize(os);
136    // thread_num and cpu_id are deterministic from the config
137    SERIALIZE_SCALAR(func_exe_inst);
138    SERIALIZE_SCALAR(inst);
139
140#if FULL_SYSTEM
141    kernelStats->serialize(os);
142#endif
143}
144
145
146void
147ExecContext::unserialize(Checkpoint *cp, const std::string &section)
148{
149    UNSERIALIZE_ENUM(_status);
150    regs.unserialize(cp, section);
151    // thread_num and cpu_id are deterministic from the config
152    UNSERIALIZE_SCALAR(func_exe_inst);
153    UNSERIALIZE_SCALAR(inst);
154
155#if FULL_SYSTEM
156    kernelStats->unserialize(cp, section);
157#endif
158}
159
160
161void
162ExecContext::activate(int delay)
163{
164    if (status() == Active)
165        return;
166
167    _status = Active;
168    cpu->activateContext(thread_num, delay);
169}
170
171void
172ExecContext::suspend()
173{
174    if (status() == Suspended)
175        return;
176
177#if FULL_SYSTEM
178    // Don't change the status from active if there are pending interrupts
179    if (cpu->check_interrupts()) {
180        assert(status() == Active);
181        return;
182    }
183#endif
184
185    _status = Suspended;
186    cpu->suspendContext(thread_num);
187}
188
189void
190ExecContext::deallocate()
191{
192    if (status() == Unallocated)
193        return;
194
195    _status = Unallocated;
196    cpu->deallocateContext(thread_num);
197}
198
199void
200ExecContext::halt()
201{
202    if (status() == Halted)
203        return;
204
205    _status = Halted;
206    cpu->haltContext(thread_num);
207}
208
209
210void
211ExecContext::regStats(const string &name)
212{
213#if FULL_SYSTEM
214    kernelStats->regStats(name + ".kern");
215#endif
216}
217
218void
219ExecContext::trap(Fault fault)
220{
221    //TheISA::trap(fault);    //One possible way to do it...
222
223    /** @todo: Going to hack it for now.  Do a true fixup later. */
224#if FULL_SYSTEM
225    ev5_trap(fault);
226#else
227    fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
228#endif
229}
230