thread_context.hh revision 12106:7784fac1b159
1/*
2 * Copyright (c) 2011-2012 ARM Limited
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
4 * All rights reserved
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating
9 * to a hardware implementation of the functionality of the software
10 * licensed hereunder.  You may use the software subject to the license
11 * terms below provided that you ensure that this notice is replicated
12 * unmodified and in its entirety in all distributions of the software,
13 * modified or unmodified, in source code or in binary form.
14 *
15 * Copyright (c) 2006 The Regents of The University of Michigan
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Kevin Lim
42 */
43
44#ifndef __CPU_THREAD_CONTEXT_HH__
45#define __CPU_THREAD_CONTEXT_HH__
46
47#include <iostream>
48#include <string>
49
50#include "arch/registers.hh"
51#include "arch/types.hh"
52#include "base/types.hh"
53#include "config/the_isa.hh"
54#include "cpu/reg_class.hh"
55
56// @todo: Figure out a more architecture independent way to obtain the ITB and
57// DTB pointers.
58namespace TheISA
59{
60    class Decoder;
61    class TLB;
62}
63class BaseCPU;
64class CheckerCPU;
65class Checkpoint;
66class EndQuiesceEvent;
67class SETranslatingPortProxy;
68class FSTranslatingPortProxy;
69class PortProxy;
70class Process;
71class System;
72namespace TheISA {
73    namespace Kernel {
74        class Statistics;
75    }
76}
77
78/**
79 * ThreadContext is the external interface to all thread state for
80 * anything outside of the CPU. It provides all accessor methods to
81 * state that might be needed by external objects, ranging from
82 * register values to things such as kernel stats. It is an abstract
83 * base class; the CPU can create its own ThreadContext by either
84 * deriving from it, or using the templated ProxyThreadContext.
85 *
86 * The ThreadContext is slightly different than the ExecContext.  The
87 * ThreadContext provides access to an individual thread's state; an
88 * ExecContext provides ISA access to the CPU (meaning it is
89 * implicitly multithreaded on SMT systems).  Additionally the
90 * ThreadState is an abstract class that exactly defines the
91 * interface; the ExecContext is a more implicit interface that must
92 * be implemented so that the ISA can access whatever state it needs.
93 */
94class ThreadContext
95{
96  protected:
97    typedef TheISA::MachInst MachInst;
98    typedef TheISA::IntReg IntReg;
99    typedef TheISA::FloatReg FloatReg;
100    typedef TheISA::FloatRegBits FloatRegBits;
101    typedef TheISA::CCReg CCReg;
102    typedef TheISA::MiscReg MiscReg;
103  public:
104
105    enum Status
106    {
107        /// Running.  Instructions should be executed only when
108        /// the context is in this state.
109        Active,
110
111        /// Temporarily inactive.  Entered while waiting for
112        /// synchronization, etc.
113        Suspended,
114
115        /// Permanently shut down.  Entered when target executes
116        /// m5exit pseudo-instruction.  When all contexts enter
117        /// this state, the simulation will terminate.
118        Halted
119    };
120
121    virtual ~ThreadContext() { };
122
123    virtual BaseCPU *getCpuPtr() = 0;
124
125    virtual int cpuId() const = 0;
126
127    virtual uint32_t socketId() const = 0;
128
129    virtual int threadId() const = 0;
130
131    virtual void setThreadId(int id) = 0;
132
133    virtual int contextId() const = 0;
134
135    virtual void setContextId(int id) = 0;
136
137    virtual TheISA::TLB *getITBPtr() = 0;
138
139    virtual TheISA::TLB *getDTBPtr() = 0;
140
141    virtual CheckerCPU *getCheckerCpuPtr() = 0;
142
143    virtual TheISA::Decoder *getDecoderPtr() = 0;
144
145    virtual System *getSystemPtr() = 0;
146
147    virtual TheISA::Kernel::Statistics *getKernelStats() = 0;
148
149    virtual PortProxy &getPhysProxy() = 0;
150
151    virtual FSTranslatingPortProxy &getVirtProxy() = 0;
152
153    /**
154     * Initialise the physical and virtual port proxies and tie them to
155     * the data port of the CPU.
156     *
157     * tc ThreadContext for the virtual-to-physical translation
158     */
159    virtual void initMemProxies(ThreadContext *tc) = 0;
160
161    virtual SETranslatingPortProxy &getMemProxy() = 0;
162
163    virtual Process *getProcessPtr() = 0;
164
165    virtual void setProcessPtr(Process *p) = 0;
166
167    virtual Status status() const = 0;
168
169    virtual void setStatus(Status new_status) = 0;
170
171    /// Set the status to Active.
172    virtual void activate() = 0;
173
174    /// Set the status to Suspended.
175    virtual void suspend() = 0;
176
177    /// Set the status to Halted.
178    virtual void halt() = 0;
179
180    /// Quiesce thread context
181    void quiesce();
182
183    /// Quiesce, suspend, and schedule activate at resume
184    void quiesceTick(Tick resume);
185
186    virtual void dumpFuncProfile() = 0;
187
188    virtual void takeOverFrom(ThreadContext *old_context) = 0;
189
190    virtual void regStats(const std::string &name) = 0;
191
192    virtual EndQuiesceEvent *getQuiesceEvent() = 0;
193
194    // Not necessarily the best location for these...
195    // Having an extra function just to read these is obnoxious
196    virtual Tick readLastActivate() = 0;
197    virtual Tick readLastSuspend() = 0;
198
199    virtual void profileClear() = 0;
200    virtual void profileSample() = 0;
201
202    virtual void copyArchRegs(ThreadContext *tc) = 0;
203
204    virtual void clearArchRegs() = 0;
205
206    //
207    // New accessors for new decoder.
208    //
209    virtual uint64_t readIntReg(int reg_idx) = 0;
210
211    virtual FloatReg readFloatReg(int reg_idx) = 0;
212
213    virtual FloatRegBits readFloatRegBits(int reg_idx) = 0;
214
215    virtual CCReg readCCReg(int reg_idx) = 0;
216
217    virtual void setIntReg(int reg_idx, uint64_t val) = 0;
218
219    virtual void setFloatReg(int reg_idx, FloatReg val) = 0;
220
221    virtual void setFloatRegBits(int reg_idx, FloatRegBits val) = 0;
222
223    virtual void setCCReg(int reg_idx, CCReg val) = 0;
224
225    virtual TheISA::PCState pcState() = 0;
226
227    virtual void pcState(const TheISA::PCState &val) = 0;
228
229    void
230    setNPC(Addr val)
231    {
232        TheISA::PCState pc_state = pcState();
233        pc_state.setNPC(val);
234        pcState(pc_state);
235    }
236
237    virtual void pcStateNoRecord(const TheISA::PCState &val) = 0;
238
239    virtual Addr instAddr() = 0;
240
241    virtual Addr nextInstAddr() = 0;
242
243    virtual MicroPC microPC() = 0;
244
245    virtual MiscReg readMiscRegNoEffect(int misc_reg) const = 0;
246
247    virtual MiscReg readMiscReg(int misc_reg) = 0;
248
249    virtual void setMiscRegNoEffect(int misc_reg, const MiscReg &val) = 0;
250
251    virtual void setMiscReg(int misc_reg, const MiscReg &val) = 0;
252
253    virtual RegId flattenRegId(const RegId& regId) const = 0;
254
255    virtual uint64_t
256    readRegOtherThread(const RegId& misc_reg, ThreadID tid)
257    {
258        return 0;
259    }
260
261    virtual void
262    setRegOtherThread(const RegId& misc_reg, const MiscReg &val, ThreadID tid)
263    {
264    }
265
266    // Also not necessarily the best location for these two.  Hopefully will go
267    // away once we decide upon where st cond failures goes.
268    virtual unsigned readStCondFailures() = 0;
269
270    virtual void setStCondFailures(unsigned sc_failures) = 0;
271
272    // Same with st cond failures.
273    virtual Counter readFuncExeInst() = 0;
274
275    virtual void syscall(int64_t callnum, Fault *fault) = 0;
276
277    // This function exits the thread context in the CPU and returns
278    // 1 if the CPU has no more active threads (meaning it's OK to exit);
279    // Used in syscall-emulation mode when a  thread calls the exit syscall.
280    virtual int exit() { return 1; };
281
282    /** function to compare two thread contexts (for debugging) */
283    static void compare(ThreadContext *one, ThreadContext *two);
284
285    /** @{ */
286    /**
287     * Flat register interfaces
288     *
289     * Some architectures have different registers visible in
290     * different modes. Such architectures "flatten" a register (see
291     * flattenRegId()) to map it into the
292     * gem5 register file. This interface provides a flat interface to
293     * the underlying register file, which allows for example
294     * serialization code to access all registers.
295     */
296
297    virtual uint64_t readIntRegFlat(int idx) = 0;
298    virtual void setIntRegFlat(int idx, uint64_t val) = 0;
299
300    virtual FloatReg readFloatRegFlat(int idx) = 0;
301    virtual void setFloatRegFlat(int idx, FloatReg val) = 0;
302
303    virtual FloatRegBits readFloatRegBitsFlat(int idx) = 0;
304    virtual void setFloatRegBitsFlat(int idx, FloatRegBits val) = 0;
305
306    virtual CCReg readCCRegFlat(int idx) = 0;
307    virtual void setCCRegFlat(int idx, CCReg val) = 0;
308    /** @} */
309
310};
311
312/**
313 * ProxyThreadContext class that provides a way to implement a
314 * ThreadContext without having to derive from it. ThreadContext is an
315 * abstract class, so anything that derives from it and uses its
316 * interface will pay the overhead of virtual function calls.  This
317 * class is created to enable a user-defined Thread object to be used
318 * wherever ThreadContexts are used, without paying the overhead of
319 * virtual function calls when it is used by itself.  See
320 * simple_thread.hh for an example of this.
321 */
322template <class TC>
323class ProxyThreadContext : public ThreadContext
324{
325  public:
326    ProxyThreadContext(TC *actual_tc)
327    { actualTC = actual_tc; }
328
329  private:
330    TC *actualTC;
331
332  public:
333
334    BaseCPU *getCpuPtr() { return actualTC->getCpuPtr(); }
335
336    int cpuId() const { return actualTC->cpuId(); }
337
338    uint32_t socketId() const { return actualTC->socketId(); }
339
340    int threadId() const { return actualTC->threadId(); }
341
342    void setThreadId(int id) { actualTC->setThreadId(id); }
343
344    int contextId() const { return actualTC->contextId(); }
345
346    void setContextId(int id) { actualTC->setContextId(id); }
347
348    TheISA::TLB *getITBPtr() { return actualTC->getITBPtr(); }
349
350    TheISA::TLB *getDTBPtr() { return actualTC->getDTBPtr(); }
351
352    CheckerCPU *getCheckerCpuPtr() { return actualTC->getCheckerCpuPtr(); }
353
354    TheISA::Decoder *getDecoderPtr() { return actualTC->getDecoderPtr(); }
355
356    System *getSystemPtr() { return actualTC->getSystemPtr(); }
357
358    TheISA::Kernel::Statistics *getKernelStats()
359    { return actualTC->getKernelStats(); }
360
361    PortProxy &getPhysProxy() { return actualTC->getPhysProxy(); }
362
363    FSTranslatingPortProxy &getVirtProxy() { return actualTC->getVirtProxy(); }
364
365    void initMemProxies(ThreadContext *tc) { actualTC->initMemProxies(tc); }
366
367    SETranslatingPortProxy &getMemProxy() { return actualTC->getMemProxy(); }
368
369    Process *getProcessPtr() { return actualTC->getProcessPtr(); }
370
371    void setProcessPtr(Process *p) { actualTC->setProcessPtr(p); }
372
373    Status status() const { return actualTC->status(); }
374
375    void setStatus(Status new_status) { actualTC->setStatus(new_status); }
376
377    /// Set the status to Active.
378    void activate() { actualTC->activate(); }
379
380    /// Set the status to Suspended.
381    void suspend() { actualTC->suspend(); }
382
383    /// Set the status to Halted.
384    void halt() { actualTC->halt(); }
385
386    /// Quiesce thread context
387    void quiesce() { actualTC->quiesce(); }
388
389    /// Quiesce, suspend, and schedule activate at resume
390    void quiesceTick(Tick resume) { actualTC->quiesceTick(resume); }
391
392    void dumpFuncProfile() { actualTC->dumpFuncProfile(); }
393
394    void takeOverFrom(ThreadContext *oldContext)
395    { actualTC->takeOverFrom(oldContext); }
396
397    void regStats(const std::string &name) { actualTC->regStats(name); }
398
399    EndQuiesceEvent *getQuiesceEvent() { return actualTC->getQuiesceEvent(); }
400
401    Tick readLastActivate() { return actualTC->readLastActivate(); }
402    Tick readLastSuspend() { return actualTC->readLastSuspend(); }
403
404    void profileClear() { return actualTC->profileClear(); }
405    void profileSample() { return actualTC->profileSample(); }
406
407    // @todo: Do I need this?
408    void copyArchRegs(ThreadContext *tc) { actualTC->copyArchRegs(tc); }
409
410    void clearArchRegs() { actualTC->clearArchRegs(); }
411
412    //
413    // New accessors for new decoder.
414    //
415    uint64_t readIntReg(int reg_idx)
416    { return actualTC->readIntReg(reg_idx); }
417
418    FloatReg readFloatReg(int reg_idx)
419    { return actualTC->readFloatReg(reg_idx); }
420
421    FloatRegBits readFloatRegBits(int reg_idx)
422    { return actualTC->readFloatRegBits(reg_idx); }
423
424    CCReg readCCReg(int reg_idx)
425    { return actualTC->readCCReg(reg_idx); }
426
427    void setIntReg(int reg_idx, uint64_t val)
428    { actualTC->setIntReg(reg_idx, val); }
429
430    void setFloatReg(int reg_idx, FloatReg val)
431    { actualTC->setFloatReg(reg_idx, val); }
432
433    void setFloatRegBits(int reg_idx, FloatRegBits val)
434    { actualTC->setFloatRegBits(reg_idx, val); }
435
436    void setCCReg(int reg_idx, CCReg val)
437    { actualTC->setCCReg(reg_idx, val); }
438
439    TheISA::PCState pcState() { return actualTC->pcState(); }
440
441    void pcState(const TheISA::PCState &val) { actualTC->pcState(val); }
442
443    void pcStateNoRecord(const TheISA::PCState &val) { actualTC->pcState(val); }
444
445    Addr instAddr() { return actualTC->instAddr(); }
446    Addr nextInstAddr() { return actualTC->nextInstAddr(); }
447    MicroPC microPC() { return actualTC->microPC(); }
448
449    bool readPredicate() { return actualTC->readPredicate(); }
450
451    void setPredicate(bool val)
452    { actualTC->setPredicate(val); }
453
454    MiscReg readMiscRegNoEffect(int misc_reg) const
455    { return actualTC->readMiscRegNoEffect(misc_reg); }
456
457    MiscReg readMiscReg(int misc_reg)
458    { return actualTC->readMiscReg(misc_reg); }
459
460    void setMiscRegNoEffect(int misc_reg, const MiscReg &val)
461    { return actualTC->setMiscRegNoEffect(misc_reg, val); }
462
463    void setMiscReg(int misc_reg, const MiscReg &val)
464    { return actualTC->setMiscReg(misc_reg, val); }
465
466    RegId flattenRegId(const RegId& regId) const
467    { return actualTC->flattenRegId(regId); }
468
469    unsigned readStCondFailures()
470    { return actualTC->readStCondFailures(); }
471
472    void setStCondFailures(unsigned sc_failures)
473    { actualTC->setStCondFailures(sc_failures); }
474
475    void syscall(int64_t callnum, Fault *fault)
476    { actualTC->syscall(callnum, fault); }
477
478    Counter readFuncExeInst() { return actualTC->readFuncExeInst(); }
479
480    uint64_t readIntRegFlat(int idx)
481    { return actualTC->readIntRegFlat(idx); }
482
483    void setIntRegFlat(int idx, uint64_t val)
484    { actualTC->setIntRegFlat(idx, val); }
485
486    FloatReg readFloatRegFlat(int idx)
487    { return actualTC->readFloatRegFlat(idx); }
488
489    void setFloatRegFlat(int idx, FloatReg val)
490    { actualTC->setFloatRegFlat(idx, val); }
491
492    FloatRegBits readFloatRegBitsFlat(int idx)
493    { return actualTC->readFloatRegBitsFlat(idx); }
494
495    void setFloatRegBitsFlat(int idx, FloatRegBits val)
496    { actualTC->setFloatRegBitsFlat(idx, val); }
497
498    CCReg readCCRegFlat(int idx)
499    { return actualTC->readCCRegFlat(idx); }
500
501    void setCCRegFlat(int idx, CCReg val)
502    { actualTC->setCCRegFlat(idx, val); }
503};
504
505/** @{ */
506/**
507 * Thread context serialization helpers
508 *
509 * These helper functions provide a way to the data in a
510 * ThreadContext. They are provided as separate helper function since
511 * implementing them as members of the ThreadContext interface would
512 * be confusing when the ThreadContext is exported via a proxy.
513 */
514
515void serialize(ThreadContext &tc, CheckpointOut &cp);
516void unserialize(ThreadContext &tc, CheckpointIn &cp);
517
518/** @} */
519
520
521/**
522 * Copy state between thread contexts in preparation for CPU handover.
523 *
524 * @note This method modifies the old thread contexts as well as the
525 * new thread context. The old thread context will have its quiesce
526 * event descheduled if it is scheduled and its status set to halted.
527 *
528 * @param new_tc Destination ThreadContext.
529 * @param old_tc Source ThreadContext.
530 */
531void takeOverFrom(ThreadContext &new_tc, ThreadContext &old_tc);
532
533#endif
534