simple_thread.hh revision 6323 
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 * Authors: Steve Reinhardt
29 *          Nathan Binkert
30 */
31
32#ifndef __CPU_SIMPLE_THREAD_HH__
33#define __CPU_SIMPLE_THREAD_HH__
34
35#include "arch/isa.hh"
36#include "arch/isa_traits.hh"
37#include "arch/regfile.hh"
38#include "arch/tlb.hh"
39#include "arch/types.hh"
40#include "base/types.hh"
41#include "config/full_system.hh"
42#include "cpu/thread_context.hh"
43#include "cpu/thread_state.hh"
44#include "mem/request.hh"
45#include "sim/byteswap.hh"
46#include "sim/eventq.hh"
47#include "sim/serialize.hh"
48
49class BaseCPU;
50
51#if FULL_SYSTEM
52
53#include "sim/system.hh"
54
55class FunctionProfile;
56class ProfileNode;
57class FunctionalPort;
58class PhysicalPort;
59
60namespace TheISA {
61    namespace Kernel {
62        class Statistics;
63    };
64};
65
66#else // !FULL_SYSTEM
67
68#include "sim/process.hh"
69#include "mem/page_table.hh"
70class TranslatingPort;
71
72#endif // FULL_SYSTEM
73
74/**
75 * The SimpleThread object provides a combination of the ThreadState
76 * object and the ThreadContext interface. It implements the
77 * ThreadContext interface so that a ProxyThreadContext class can be
78 * made using SimpleThread as the template parameter (see
79 * thread_context.hh). It adds to the ThreadState object by adding all
80 * the objects needed for simple functional execution, including a
81 * simple architectural register file, and pointers to the ITB and DTB
82 * in full system mode. For CPU models that do not need more advanced
83 * ways to hold state (i.e. a separate physical register file, or
84 * separate fetch and commit PC's), this SimpleThread class provides
85 * all the necessary state for full architecture-level functional
86 * simulation.  See the AtomicSimpleCPU or TimingSimpleCPU for
87 * examples.
88 */
89
90class SimpleThread : public ThreadState
91{
92  protected:
93    typedef TheISA::RegFile RegFile;
94    typedef TheISA::MachInst MachInst;
95    typedef TheISA::MiscReg MiscReg;
96    typedef TheISA::FloatReg FloatReg;
97    typedef TheISA::FloatRegBits FloatRegBits;
98  public:
99    typedef ThreadContext::Status Status;
100
101  protected:
102    RegFile regs;       // correct-path register context
103    union {
104        FloatReg f[TheISA::NumFloatRegs];
105        FloatRegBits i[TheISA::NumFloatRegs];
106    } floatRegs;
107    TheISA::IntReg intRegs[TheISA::NumIntRegs];
108    TheISA::ISA isa;    // one "instance" of the current ISA.
109
110  public:
111    // pointer to CPU associated with this SimpleThread
112    BaseCPU *cpu;
113
114    ProxyThreadContext<SimpleThread> *tc;
115
116    System *system;
117
118    TheISA::TLB *itb;
119    TheISA::TLB *dtb;
120
121    // constructor: initialize SimpleThread from given process structure
122#if FULL_SYSTEM
123    SimpleThread(BaseCPU *_cpu, int _thread_num, System *_system,
124                 TheISA::TLB *_itb, TheISA::TLB *_dtb,
125                 bool use_kernel_stats = true);
126#else
127    SimpleThread(BaseCPU *_cpu, int _thread_num, Process *_process,
128                 TheISA::TLB *_itb, TheISA::TLB *_dtb, int _asid);
129#endif
130
131    SimpleThread();
132
133    virtual ~SimpleThread();
134
135    virtual void takeOverFrom(ThreadContext *oldContext);
136
137    void regStats(const std::string &name);
138
139    void copyTC(ThreadContext *context);
140
141    void copyState(ThreadContext *oldContext);
142
143    void serialize(std::ostream &os);
144    void unserialize(Checkpoint *cp, const std::string &section);
145
146    /***************************************************************
147     *  SimpleThread functions to provide CPU with access to various
148     *  state.
149     **************************************************************/
150
151    /** Returns the pointer to this SimpleThread's ThreadContext. Used
152     *  when a ThreadContext must be passed to objects outside of the
153     *  CPU.
154     */
155    ThreadContext *getTC() { return tc; }
156
157    void demapPage(Addr vaddr, uint64_t asn)
158    {
159        itb->demapPage(vaddr, asn);
160        dtb->demapPage(vaddr, asn);
161    }
162
163    void demapInstPage(Addr vaddr, uint64_t asn)
164    {
165        itb->demapPage(vaddr, asn);
166    }
167
168    void demapDataPage(Addr vaddr, uint64_t asn)
169    {
170        dtb->demapPage(vaddr, asn);
171    }
172
173#if FULL_SYSTEM
174    int getInstAsid() { return isa.instAsid(); }
175    int getDataAsid() { return isa.dataAsid(); }
176
177    void dumpFuncProfile();
178
179    Fault hwrei();
180
181    bool simPalCheck(int palFunc);
182
183#endif
184
185    /*******************************************
186     * ThreadContext interface functions.
187     ******************************************/
188
189    BaseCPU *getCpuPtr() { return cpu; }
190
191    TheISA::TLB *getITBPtr() { return itb; }
192
193    TheISA::TLB *getDTBPtr() { return dtb; }
194
195    System *getSystemPtr() { return system; }
196
197#if FULL_SYSTEM
198    FunctionalPort *getPhysPort() { return physPort; }
199
200    /** Return a virtual port. This port cannot be cached locally in an object.
201     * After a CPU switch it may point to the wrong memory object which could
202     * mean stale data.
203     */
204    VirtualPort *getVirtPort() { return virtPort; }
205#endif
206
207    Status status() const { return _status; }
208
209    void setStatus(Status newStatus) { _status = newStatus; }
210
211    /// Set the status to Active.  Optional delay indicates number of
212    /// cycles to wait before beginning execution.
213    void activate(int delay = 1);
214
215    /// Set the status to Suspended.
216    void suspend();
217
218    /// Set the status to Halted.
219    void halt();
220
221    virtual bool misspeculating();
222
223    Fault instRead(RequestPtr &req)
224    {
225        panic("instRead not implemented");
226        // return funcPhysMem->read(req, inst);
227        return NoFault;
228    }
229
230    void copyArchRegs(ThreadContext *tc);
231
232    void clearArchRegs()
233    {
234        regs.clear();
235        memset(intRegs, 0, sizeof(intRegs));
236        memset(floatRegs.i, 0, sizeof(floatRegs.i));
237    }
238
239    //
240    // New accessors for new decoder.
241    //
242    uint64_t readIntReg(int reg_idx)
243    {
244        int flatIndex = isa.flattenIntIndex(reg_idx);
245        assert(flatIndex < TheISA::NumIntRegs);
246        return intRegs[flatIndex];
247    }
248
249    FloatReg readFloatReg(int reg_idx)
250    {
251        int flatIndex = isa.flattenFloatIndex(reg_idx);
252        assert(flatIndex < TheISA::NumFloatRegs);
253        return floatRegs.f[flatIndex];
254    }
255
256    FloatRegBits readFloatRegBits(int reg_idx)
257    {
258        int flatIndex = isa.flattenFloatIndex(reg_idx);
259        assert(flatIndex < TheISA::NumFloatRegs);
260        return floatRegs.i[flatIndex];
261    }
262
263    void setIntReg(int reg_idx, uint64_t val)
264    {
265        int flatIndex = isa.flattenIntIndex(reg_idx);
266        assert(flatIndex < TheISA::NumIntRegs);
267        intRegs[flatIndex] = val;
268    }
269
270    void setFloatReg(int reg_idx, FloatReg val)
271    {
272        int flatIndex = isa.flattenFloatIndex(reg_idx);
273        assert(flatIndex < TheISA::NumFloatRegs);
274        floatRegs.f[flatIndex] = val;
275    }
276
277    void setFloatRegBits(int reg_idx, FloatRegBits val)
278    {
279        int flatIndex = isa.flattenFloatIndex(reg_idx);
280        assert(flatIndex < TheISA::NumFloatRegs);
281        floatRegs.i[flatIndex] = val;
282    }
283
284    uint64_t readPC()
285    {
286        return regs.readPC();
287    }
288
289    void setPC(uint64_t val)
290    {
291        regs.setPC(val);
292    }
293
294    uint64_t readMicroPC()
295    {
296        return microPC;
297    }
298
299    void setMicroPC(uint64_t val)
300    {
301        microPC = val;
302    }
303
304    uint64_t readNextPC()
305    {
306        return regs.readNextPC();
307    }
308
309    void setNextPC(uint64_t val)
310    {
311        regs.setNextPC(val);
312    }
313
314    uint64_t readNextMicroPC()
315    {
316        return nextMicroPC;
317    }
318
319    void setNextMicroPC(uint64_t val)
320    {
321        nextMicroPC = val;
322    }
323
324    uint64_t readNextNPC()
325    {
326        return regs.readNextNPC();
327    }
328
329    void setNextNPC(uint64_t val)
330    {
331        regs.setNextNPC(val);
332    }
333
334    MiscReg
335    readMiscRegNoEffect(int misc_reg, ThreadID tid = 0)
336    {
337        return isa.readMiscRegNoEffect(misc_reg);
338    }
339
340    MiscReg
341    readMiscReg(int misc_reg, ThreadID tid = 0)
342    {
343        return isa.readMiscReg(misc_reg, tc);
344    }
345
346    void
347    setMiscRegNoEffect(int misc_reg, const MiscReg &val, ThreadID tid = 0)
348    {
349        return isa.setMiscRegNoEffect(misc_reg, val);
350    }
351
352    void
353    setMiscReg(int misc_reg, const MiscReg &val, ThreadID tid = 0)
354    {
355        return isa.setMiscReg(misc_reg, val, tc);
356    }
357
358    int
359    flattenIntIndex(int reg)
360    {
361        return isa.flattenIntIndex(reg);
362    }
363
364    int
365    flattenFloatIndex(int reg)
366    {
367        return isa.flattenFloatIndex(reg);
368    }
369
370    unsigned readStCondFailures() { return storeCondFailures; }
371
372    void setStCondFailures(unsigned sc_failures)
373    { storeCondFailures = sc_failures; }
374
375#if !FULL_SYSTEM
376    void syscall(int64_t callnum)
377    {
378        process->syscall(callnum, tc);
379    }
380#endif
381};
382
383
384// for non-speculative execution context, spec_mode is always false
385inline bool
386SimpleThread::misspeculating()
387{
388    return false;
389}
390
391#endif // __CPU_CPU_EXEC_CONTEXT_HH__
392