simple_thread.cc revision 716 
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      swCtx(NULL), func_exe_inst(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_inst(0), storeCondFailures(0)
62{
63    memset(&regs, 0, sizeof(RegFile));
64}
65
66ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
67                         FunctionalMemory *_mem, int _asid)
68    : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
69      func_exe_inst(0), storeCondFailures(0)
70{
71    memset(&regs, 0, sizeof(RegFile));
72}
73#endif
74
75
76void
77ExecContext::takeOverFrom(ExecContext *oldContext)
78{
79    // some things should already be set up
80    assert(mem == oldContext->mem);
81#ifdef FULL_SYSTEM
82    assert(system == oldContext->system);
83#else
84    assert(process == oldContext->process);
85#endif
86
87    // copy over functional state
88    _status = oldContext->_status;
89#ifdef FULL_SYSTEM
90    kernelStats = oldContext->kernelStats;
91#endif
92    regs = oldContext->regs;
93    cpu_id = oldContext->cpu_id;
94    func_exe_inst = oldContext->func_exe_inst;
95
96    storeCondFailures = 0;
97
98    oldContext->_status = ExecContext::Unallocated;
99}
100
101
102void
103ExecContext::serialize(ostream &os)
104{
105    SERIALIZE_ENUM(_status);
106    regs.serialize(os);
107    // thread_num and cpu_id are deterministic from the config
108    SERIALIZE_SCALAR(func_exe_inst);
109    SERIALIZE_SCALAR(inst);
110
111#ifdef FULL_SYSTEM
112    bool ctx = false;
113    if (swCtx) {
114        ctx = true;
115        SERIALIZE_SCALAR(ctx);
116        SERIALIZE_SCALAR(swCtx->calls);
117        std::stack<fnCall *> *stack = &(swCtx->callStack);
118        fnCall *top;
119        int size = stack->size();
120        SERIALIZE_SCALAR(size);
121
122        for (int j=0; j<size; ++j) {
123            top = stack->top();
124            paramOut(os, csprintf("stackpos[%d]",j), top->name);
125            delete top;
126            stack->pop();
127        }
128    } else {
129        SERIALIZE_SCALAR(ctx);
130    }
131    if (system->bin) {
132        Statistics::MainBin *cur = Statistics::MainBin::curBin();
133        string bin_name = cur->name();
134        SERIALIZE_SCALAR(bin_name);
135    }
136#endif //FULL_SYSTEM
137}
138
139
140void
141ExecContext::unserialize(Checkpoint *cp, const std::string &section)
142{
143    UNSERIALIZE_ENUM(_status);
144    regs.unserialize(cp, section);
145    // thread_num and cpu_id are deterministic from the config
146    UNSERIALIZE_SCALAR(func_exe_inst);
147    UNSERIALIZE_SCALAR(inst);
148
149#ifdef FULL_SYSTEM
150    bool ctx;
151    UNSERIALIZE_SCALAR(ctx);
152    if (ctx) {
153        swCtx = new SWContext;
154        UNSERIALIZE_SCALAR(swCtx->calls);
155        int size;
156        UNSERIALIZE_SCALAR(size);
157
158        vector<fnCall *> calls;
159        fnCall *call;
160        for (int i=0; i<size; ++i) {
161            call = new fnCall;
162            paramIn(cp, section, csprintf("stackpos[%d]",i), call->name);
163            call->myBin = system->getBin(call->name);
164            calls.push_back(call);
165        }
166
167        for (int i=size-1; i>=0; --i) {
168            swCtx->callStack.push(calls[i]);
169        }
170
171    }
172
173    if (system->bin) {
174        string bin_name;
175        UNSERIALIZE_SCALAR(bin_name);
176        system->getBin(bin_name)->activate();
177    }
178#endif //FULL_SYSTEM
179}
180
181
182void
183ExecContext::activate(int delay)
184{
185    if (status() == Active)
186        return;
187
188    _status = Active;
189    cpu->activateContext(thread_num, delay);
190}
191
192void
193ExecContext::suspend()
194{
195    if (status() == Suspended)
196        return;
197
198#ifdef FULL_SYSTEM
199    // Don't change the status from active if there are pending interrupts
200    if (cpu->check_interrupts()) {
201        assert(status() == Active);
202        return;
203    }
204#endif
205
206    _status = Suspended;
207    cpu->suspendContext(thread_num);
208}
209
210void
211ExecContext::deallocate()
212{
213    if (status() == Unallocated)
214        return;
215
216    _status = Unallocated;
217    cpu->deallocateContext(thread_num);
218}
219
220void
221ExecContext::halt()
222{
223    if (status() == Halted)
224        return;
225
226    _status = Halted;
227    cpu->haltContext(thread_num);
228}
229
230
231void
232ExecContext::regStats(const string &name)
233{
234#ifdef FULL_SYSTEM
235    kernelStats.regStats(name + ".kern");
236#endif
237}
238
239void
240ExecContext::trap(Fault fault)
241{
242    //TheISA::trap(fault);    //One possible way to do it...
243
244    /** @todo: Going to hack it for now.  Do a true fixup later. */
245#ifdef FULL_SYSTEM
246    ev5_trap(fault);
247#else
248    fatal("fault (%d) detected @ PC 0x%08p", fault, readPC());
249#endif
250}
251