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31 #ifndef __CPU_THREAD_CONTEXT_HH__
32 #define __CPU_THREAD_CONTEXT_HH__
34 #include "arch/regfile.hh"
35 #include "arch/syscallreturn.hh"
36 #include "arch/types.hh"
37 #include "config/full_system.hh"
38 #include "mem/request.hh"
39 #include "sim/faults.hh"
40 #include "sim/host.hh"
41 #include "sim/serialize.hh"
42 #include "sim/byteswap.hh"
44 // @todo: Figure out a more architecture independent way to obtain the ITB and
52 class EndQuiesceEvent;
54 class TranslatingPort;
64 * ThreadContext is the external interface to all thread state for
65 * anything outside of the CPU. It provides all accessor methods to
66 * state that might be needed by external objects, ranging from
67 * register values to things such as kernel stats. It is an abstract
68 * base class; the CPU can create its own ThreadContext by either
69 * deriving from it, or using the templated ProxyThreadContext.
71 * The ThreadContext is slightly different than the ExecContext. The
72 * ThreadContext provides access to an individual thread's state; an
73 * ExecContext provides ISA access to the CPU (meaning it is
74 * implicitly multithreaded on SMT systems). Additionally the
75 * ThreadState is an abstract class that exactly defines the
76 * interface; the ExecContext is a more implicit interface that must
77 * be implemented so that the ISA can access whatever state it needs.
82 typedef TheISA::RegFile RegFile;
83 typedef TheISA::MachInst MachInst;
84 typedef TheISA::IntReg IntReg;
85 typedef TheISA::FloatReg FloatReg;
86 typedef TheISA::FloatRegBits FloatRegBits;
87 typedef TheISA::MiscRegFile MiscRegFile;
88 typedef TheISA::MiscReg MiscReg;
92 /// Initialized but not running yet. All CPUs start in
93 /// this state, but most transition to Active on cycle 1.
94 /// In MP or SMT systems, non-primary contexts will stay
95 /// in this state until a thread is assigned to them.
98 /// Running. Instructions should be executed only when
99 /// the context is in this state.
102 /// Temporarily inactive. Entered while waiting for
103 /// synchronization, etc.
106 /// Permanently shut down. Entered when target executes
107 /// m5exit pseudo-instruction. When all contexts enter
108 /// this state, the simulation will terminate.
112 virtual ~ThreadContext() { };
114 virtual BaseCPU *getCpuPtr() = 0;
116 virtual void setCpuId(int id) = 0;
118 virtual int readCpuId() = 0;
121 virtual System *getSystemPtr() = 0;
123 virtual TheISA::ITB *getITBPtr() = 0;
125 virtual TheISA::DTB *getDTBPtr() = 0;
127 virtual Kernel::Statistics *getKernelStats() = 0;
129 virtual FunctionalPort *getPhysPort() = 0;
131 virtual VirtualPort *getVirtPort(ThreadContext *tc = NULL) = 0;
133 virtual void delVirtPort(VirtualPort *vp) = 0;
135 virtual TranslatingPort *getMemPort() = 0;
137 virtual Process *getProcessPtr() = 0;
140 virtual Status status() const = 0;
142 virtual void setStatus(Status new_status) = 0;
144 /// Set the status to Active. Optional delay indicates number of
145 /// cycles to wait before beginning execution.
146 virtual void activate(int delay = 1) = 0;
148 /// Set the status to Suspended.
149 virtual void suspend() = 0;
151 /// Set the status to Unallocated.
152 virtual void deallocate(int delay = 0) = 0;
154 /// Set the status to Halted.
155 virtual void halt() = 0;
158 virtual void dumpFuncProfile() = 0;
161 virtual void takeOverFrom(ThreadContext *old_context) = 0;
163 virtual void regStats(const std::string &name) = 0;
165 virtual void serialize(std::ostream &os) = 0;
166 virtual void unserialize(Checkpoint *cp, const std::string §ion) = 0;
169 virtual EndQuiesceEvent *getQuiesceEvent() = 0;
171 // Not necessarily the best location for these...
172 // Having an extra function just to read these is obnoxious
173 virtual Tick readLastActivate() = 0;
174 virtual Tick readLastSuspend() = 0;
176 virtual void profileClear() = 0;
177 virtual void profileSample() = 0;
180 virtual int getThreadNum() = 0;
182 // Also somewhat obnoxious. Really only used for the TLB fault.
183 // However, may be quite useful in SPARC.
184 virtual TheISA::MachInst getInst() = 0;
186 virtual void copyArchRegs(ThreadContext *tc) = 0;
188 virtual void clearArchRegs() = 0;
191 // New accessors for new decoder.
193 virtual uint64_t readIntReg(int reg_idx) = 0;
195 virtual FloatReg readFloatReg(int reg_idx, int width) = 0;
197 virtual FloatReg readFloatReg(int reg_idx) = 0;
199 virtual FloatRegBits readFloatRegBits(int reg_idx, int width) = 0;
201 virtual FloatRegBits readFloatRegBits(int reg_idx) = 0;
203 virtual void setIntReg(int reg_idx, uint64_t val) = 0;
205 virtual void setFloatReg(int reg_idx, FloatReg val, int width) = 0;
207 virtual void setFloatReg(int reg_idx, FloatReg val) = 0;
209 virtual void setFloatRegBits(int reg_idx, FloatRegBits val) = 0;
211 virtual void setFloatRegBits(int reg_idx, FloatRegBits val, int width) = 0;
213 virtual uint64_t readPC() = 0;
215 virtual void setPC(uint64_t val) = 0;
217 virtual uint64_t readNextPC() = 0;
219 virtual void setNextPC(uint64_t val) = 0;
221 virtual uint64_t readNextNPC() = 0;
223 virtual void setNextNPC(uint64_t val) = 0;
225 virtual MiscReg readMiscReg(int misc_reg) = 0;
227 virtual MiscReg readMiscRegWithEffect(int misc_reg) = 0;
229 virtual void setMiscReg(int misc_reg, const MiscReg &val) = 0;
231 virtual void setMiscRegWithEffect(int misc_reg, const MiscReg &val) = 0;
233 // Also not necessarily the best location for these two. Hopefully will go
234 // away once we decide upon where st cond failures goes.
235 virtual unsigned readStCondFailures() = 0;
237 virtual void setStCondFailures(unsigned sc_failures) = 0;
239 // Only really makes sense for old CPU model. Still could be useful though.
240 virtual bool misspeculating() = 0;
243 virtual IntReg getSyscallArg(int i) = 0;
245 // used to shift args for indirect syscall
246 virtual void setSyscallArg(int i, IntReg val) = 0;
248 virtual void setSyscallReturn(SyscallReturn return_value) = 0;
250 // Same with st cond failures.
251 virtual Counter readFuncExeInst() = 0;
253 // This function exits the thread context in the CPU and returns
254 // 1 if the CPU has no more active threads (meaning it's OK to exit);
255 // Used in syscall-emulation mode when a thread calls the exit syscall.
256 virtual int exit() { return 1; };
259 virtual void changeRegFileContext(TheISA::RegContextParam param,
260 TheISA::RegContextVal val) = 0;
264 * ProxyThreadContext class that provides a way to implement a
265 * ThreadContext without having to derive from it. ThreadContext is an
266 * abstract class, so anything that derives from it and uses its
267 * interface will pay the overhead of virtual function calls. This
268 * class is created to enable a user-defined Thread object to be used
269 * wherever ThreadContexts are used, without paying the overhead of
270 * virtual function calls when it is used by itself. See
271 * simple_thread.hh for an example of this.
274 class ProxyThreadContext : public ThreadContext
277 ProxyThreadContext(TC *actual_tc)
278 { actualTC = actual_tc; }
285 BaseCPU *getCpuPtr() { return actualTC->getCpuPtr(); }
287 void setCpuId(int id) { actualTC->setCpuId(id); }
289 int readCpuId() { return actualTC->readCpuId(); }
292 System *getSystemPtr() { return actualTC->getSystemPtr(); }
294 TheISA::ITB *getITBPtr() { return actualTC->getITBPtr(); }
296 TheISA::DTB *getDTBPtr() { return actualTC->getDTBPtr(); }
298 Kernel::Statistics *getKernelStats() { return actualTC->getKernelStats(); }
300 FunctionalPort *getPhysPort() { return actualTC->getPhysPort(); }
302 VirtualPort *getVirtPort(ThreadContext *tc = NULL) { return actualTC->getVirtPort(tc); }
304 void delVirtPort(VirtualPort *vp) { return actualTC->delVirtPort(vp); }
306 TranslatingPort *getMemPort() { return actualTC->getMemPort(); }
308 Process *getProcessPtr() { return actualTC->getProcessPtr(); }
311 Status status() const { return actualTC->status(); }
313 void setStatus(Status new_status) { actualTC->setStatus(new_status); }
315 /// Set the status to Active. Optional delay indicates number of
316 /// cycles to wait before beginning execution.
317 void activate(int delay = 1) { actualTC->activate(delay); }
319 /// Set the status to Suspended.
320 void suspend() { actualTC->suspend(); }
322 /// Set the status to Unallocated.
323 void deallocate(int delay = 0) { actualTC->deallocate(); }
325 /// Set the status to Halted.
326 void halt() { actualTC->halt(); }
329 void dumpFuncProfile() { actualTC->dumpFuncProfile(); }
332 void takeOverFrom(ThreadContext *oldContext)
333 { actualTC->takeOverFrom(oldContext); }
335 void regStats(const std::string &name) { actualTC->regStats(name); }
337 void serialize(std::ostream &os) { actualTC->serialize(os); }
338 void unserialize(Checkpoint *cp, const std::string §ion)
339 { actualTC->unserialize(cp, section); }
342 EndQuiesceEvent *getQuiesceEvent() { return actualTC->getQuiesceEvent(); }
344 Tick readLastActivate() { return actualTC->readLastActivate(); }
345 Tick readLastSuspend() { return actualTC->readLastSuspend(); }
347 void profileClear() { return actualTC->profileClear(); }
348 void profileSample() { return actualTC->profileSample(); }
351 int getThreadNum() { return actualTC->getThreadNum(); }
353 // @todo: Do I need this?
354 MachInst getInst() { return actualTC->getInst(); }
356 // @todo: Do I need this?
357 void copyArchRegs(ThreadContext *tc) { actualTC->copyArchRegs(tc); }
359 void clearArchRegs() { actualTC->clearArchRegs(); }
362 // New accessors for new decoder.
364 uint64_t readIntReg(int reg_idx)
365 { return actualTC->readIntReg(reg_idx); }
367 FloatReg readFloatReg(int reg_idx, int width)
368 { return actualTC->readFloatReg(reg_idx, width); }
370 FloatReg readFloatReg(int reg_idx)
371 { return actualTC->readFloatReg(reg_idx); }
373 FloatRegBits readFloatRegBits(int reg_idx, int width)
374 { return actualTC->readFloatRegBits(reg_idx, width); }
376 FloatRegBits readFloatRegBits(int reg_idx)
377 { return actualTC->readFloatRegBits(reg_idx); }
379 void setIntReg(int reg_idx, uint64_t val)
380 { actualTC->setIntReg(reg_idx, val); }
382 void setFloatReg(int reg_idx, FloatReg val, int width)
383 { actualTC->setFloatReg(reg_idx, val, width); }
385 void setFloatReg(int reg_idx, FloatReg val)
386 { actualTC->setFloatReg(reg_idx, val); }
388 void setFloatRegBits(int reg_idx, FloatRegBits val, int width)
389 { actualTC->setFloatRegBits(reg_idx, val, width); }
391 void setFloatRegBits(int reg_idx, FloatRegBits val)
392 { actualTC->setFloatRegBits(reg_idx, val); }
394 uint64_t readPC() { return actualTC->readPC(); }
396 void setPC(uint64_t val) { actualTC->setPC(val); }
398 uint64_t readNextPC() { return actualTC->readNextPC(); }
400 void setNextPC(uint64_t val) { actualTC->setNextPC(val); }
402 uint64_t readNextNPC() { return actualTC->readNextNPC(); }
404 void setNextNPC(uint64_t val) { actualTC->setNextNPC(val); }
406 MiscReg readMiscReg(int misc_reg)
407 { return actualTC->readMiscReg(misc_reg); }
409 MiscReg readMiscRegWithEffect(int misc_reg)
410 { return actualTC->readMiscRegWithEffect(misc_reg); }
412 void setMiscReg(int misc_reg, const MiscReg &val)
413 { return actualTC->setMiscReg(misc_reg, val); }
415 void setMiscRegWithEffect(int misc_reg, const MiscReg &val)
416 { return actualTC->setMiscRegWithEffect(misc_reg, val); }
418 unsigned readStCondFailures()
419 { return actualTC->readStCondFailures(); }
421 void setStCondFailures(unsigned sc_failures)
422 { actualTC->setStCondFailures(sc_failures); }
425 bool misspeculating() { return actualTC->misspeculating(); }
428 IntReg getSyscallArg(int i) { return actualTC->getSyscallArg(i); }
430 // used to shift args for indirect syscall
431 void setSyscallArg(int i, IntReg val)
432 { actualTC->setSyscallArg(i, val); }
434 void setSyscallReturn(SyscallReturn return_value)
435 { actualTC->setSyscallReturn(return_value); }
437 Counter readFuncExeInst() { return actualTC->readFuncExeInst(); }
440 void changeRegFileContext(TheISA::RegContextParam param,
441 TheISA::RegContextVal val)
443 actualTC->changeRegFileContext(param, val);