simple_thread.cc revision 360 
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(&regs, 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 &section)
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::setStatus(Status new_status)
125{
126#ifdef FULL_SYSTEM
127    if (status() == new_status)
128        return;
129
130    // Don't change the status from active if there are pending interrupts
131    if (new_status == Suspended && cpu->check_interrupts()) {
132        assert(status() == Active);
133        return;
134    }
135#endif
136
137    _status = new_status;
138    cpu->execCtxStatusChg(thread_num);
139}
140
141void
142ExecContext::regStats(const string &name)
143{
144#ifdef FULL_SYSTEM
145    kernelStats.regStats(name + ".kern");
146#endif
147}
148