simple_thread.cc revision 237 
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/prog.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      func_exe_insn(0), storeCondFailures(0)
52{
53    memset(&regs, 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_insn(0), storeCondFailures(0)
62{
63}
64
65ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
66                         FunctionalMemory *_mem, int _asid)
67    : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
68      func_exe_insn(0), storeCondFailures(0)
69{
70}
71#endif
72
73
74void
75ExecContext::takeOverFrom(ExecContext *oldContext)
76{
77    // some things should already be set up
78    assert(mem == oldContext->mem);
79#ifdef FULL_SYSTEM
80    assert(system == oldContext->system);
81#else
82    assert(process == oldContext->process);
83#endif
84
85    // copy over functional state
86    _status = oldContext->_status;
87#ifdef FULL_SYSTEM
88    kernelStats = oldContext->kernelStats;
89#endif
90    regs = oldContext->regs;
91    cpu_id = oldContext->cpu_id;
92    func_exe_insn = oldContext->func_exe_insn;
93
94    storeCondFailures = 0;
95
96    oldContext->_status = ExecContext::Unallocated;
97}
98
99
100void
101ExecContext::serialize(ostream &os)
102{
103    SERIALIZE_ENUM(_status);
104    regs.serialize(os);
105    // thread_num and cpu_id are deterministic from the config
106    SERIALIZE_SCALAR(func_exe_insn);
107}
108
109
110void
111ExecContext::unserialize(Checkpoint *cp, const std::string &section)
112{
113    UNSERIALIZE_ENUM(_status);
114    regs.unserialize(cp, section);
115    // thread_num and cpu_id are deterministic from the config
116    UNSERIALIZE_SCALAR(func_exe_insn);
117}
118
119
120void
121ExecContext::setStatus(Status new_status)
122{
123#ifdef FULL_SYSTEM
124    if (status() == new_status)
125        return;
126
127    // Don't change the status from active if there are pending interrupts
128    if (new_status == Suspended && cpu->check_interrupts()) {
129        assert(status() == Active);
130        return;
131    }
132#endif
133
134    _status = new_status;
135    cpu->execCtxStatusChg(thread_num);
136}
137
138void
139ExecContext::regStats(const string &name)
140{
141#ifdef FULL_SYSTEM
142    kernelStats.regStats(name + ".kern");
143#endif
144}
145