1/*
2 * Copyright (c) 2002-2005 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 */
30
31#include "arch/utility.hh"
32#include "arch/faults.hh"
33#include "base/cprintf.hh"
34#include "base/inifile.hh"
35#include "base/loader/symtab.hh"
36#include "base/misc.hh"
37#include "base/pollevent.hh"
38#include "base/range.hh"
39#include "base/stats/events.hh"
40#include "base/trace.hh"
41#include "cpu/base.hh"
42#include "cpu/exetrace.hh"
43#include "cpu/profile.hh"
44#include "cpu/simple/base.hh"
45#include "cpu/simple_thread.hh"
46#include "cpu/smt.hh"
47#include "cpu/static_inst.hh"
48#include "cpu/thread_context.hh"
49#include "mem/packet.hh"
50#include "sim/byteswap.hh"
51#include "sim/debug.hh"
52#include "sim/host.hh"
53#include "sim/sim_events.hh"
54#include "sim/sim_object.hh"
55#include "sim/stats.hh"
56#include "sim/system.hh"
57
58#if FULL_SYSTEM
59#include "arch/kernel_stats.hh"
60#include "arch/stacktrace.hh"
61#include "arch/tlb.hh"
62#include "arch/vtophys.hh"
63#include "base/remote_gdb.hh"
64#else // !FULL_SYSTEM
65#include "mem/mem_object.hh"
66#endif // FULL_SYSTEM
67
68using namespace std;
69using namespace TheISA;
70
71BaseSimpleCPU::BaseSimpleCPU(Params *p)
72 : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
73{
74#if FULL_SYSTEM
75 thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
76#else
77 thread = new SimpleThread(this, /* thread_num */ 0, p->process,
78 p->itb, p->dtb, /* asid */ 0);
79#endif // !FULL_SYSTEM
80
81 thread->setStatus(ThreadContext::Unallocated);
82
83 tc = thread->getTC();
84
85 numInst = 0;
86 startNumInst = 0;
87 numLoad = 0;
88 startNumLoad = 0;
89 lastIcacheStall = 0;
90 lastDcacheStall = 0;
91
92 threadContexts.push_back(tc);
93
94 cpuId = tc->readCpuId();
95
96 fetchOffset = 0;
97 stayAtPC = false;
98}
99
100BaseSimpleCPU::~BaseSimpleCPU()
101{
102}
103
104void
105BaseSimpleCPU::deallocateContext(int thread_num)
106{
107 // for now, these are equivalent
108 suspendContext(thread_num);
109}
110
111
112void
113BaseSimpleCPU::haltContext(int thread_num)
114{
115 // for now, these are equivalent
116 suspendContext(thread_num);
117}
118
119
120void
121BaseSimpleCPU::regStats()
122{
123 using namespace Stats;
124
125 BaseCPU::regStats();
126
127 numInsts
128 .name(name() + ".num_insts")
129 .desc("Number of instructions executed")
130 ;
131
132 numMemRefs
133 .name(name() + ".num_refs")
134 .desc("Number of memory references")
135 ;
136
137 notIdleFraction
138 .name(name() + ".not_idle_fraction")
139 .desc("Percentage of non-idle cycles")
140 ;
141
142 idleFraction
143 .name(name() + ".idle_fraction")
144 .desc("Percentage of idle cycles")
145 ;
146
147 icacheStallCycles
148 .name(name() + ".icache_stall_cycles")
149 .desc("ICache total stall cycles")
150 .prereq(icacheStallCycles)
151 ;
152
153 dcacheStallCycles
154 .name(name() + ".dcache_stall_cycles")
155 .desc("DCache total stall cycles")
156 .prereq(dcacheStallCycles)
157 ;
158
159 icacheRetryCycles
160 .name(name() + ".icache_retry_cycles")
161 .desc("ICache total retry cycles")
162 .prereq(icacheRetryCycles)
163 ;
164
165 dcacheRetryCycles
166 .name(name() + ".dcache_retry_cycles")
167 .desc("DCache total retry cycles")
168 .prereq(dcacheRetryCycles)
169 ;
170
171 idleFraction = constant(1.0) - notIdleFraction;
172}
173
174void
175BaseSimpleCPU::resetStats()
176{
177// startNumInst = numInst;
178 // notIdleFraction = (_status != Idle);
179}
180
181void
182BaseSimpleCPU::serialize(ostream &os)
183{
184 BaseCPU::serialize(os);
185// SERIALIZE_SCALAR(inst);
186 nameOut(os, csprintf("%s.xc.0", name()));
187 thread->serialize(os);
188}
189
190void
191BaseSimpleCPU::unserialize(Checkpoint *cp, const string §ion)
192{
193 BaseCPU::unserialize(cp, section);
194// UNSERIALIZE_SCALAR(inst);
195 thread->unserialize(cp, csprintf("%s.xc.0", section));
196}
197
198void
199change_thread_state(int thread_number, int activate, int priority)
200{
201}
202
203Fault
204BaseSimpleCPU::copySrcTranslate(Addr src)
205{
206#if 0
207 static bool no_warn = true;
208 int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
209 // Only support block sizes of 64 atm.
210 assert(blk_size == 64);
211 int offset = src & (blk_size - 1);
212
213 // Make sure block doesn't span page
214 if (no_warn &&
215 (src & PageMask) != ((src + blk_size) & PageMask) &&
216 (src >> 40) != 0xfffffc) {
217 warn("Copied block source spans pages %x.", src);
218 no_warn = false;
219 }
220
221 memReq->reset(src & ~(blk_size - 1), blk_size);
222
223 // translate to physical address
224 Fault fault = thread->translateDataReadReq(req);
225
226 if (fault == NoFault) {
227 thread->copySrcAddr = src;
228 thread->copySrcPhysAddr = memReq->paddr + offset;
229 } else {
230 assert(!fault->isAlignmentFault());
231
232 thread->copySrcAddr = 0;
233 thread->copySrcPhysAddr = 0;
234 }
235 return fault;
236#else
237 return NoFault;
238#endif
239}
240
241Fault
242BaseSimpleCPU::copy(Addr dest)
243{
244#if 0
245 static bool no_warn = true;
246 int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
247 // Only support block sizes of 64 atm.
248 assert(blk_size == 64);
249 uint8_t data[blk_size];
250 //assert(thread->copySrcAddr);
251 int offset = dest & (blk_size - 1);
252
253 // Make sure block doesn't span page
254 if (no_warn &&
255 (dest & PageMask) != ((dest + blk_size) & PageMask) &&
256 (dest >> 40) != 0xfffffc) {
257 no_warn = false;
258 warn("Copied block destination spans pages %x. ", dest);
259 }
260
261 memReq->reset(dest & ~(blk_size -1), blk_size);
262 // translate to physical address
263 Fault fault = thread->translateDataWriteReq(req);
264
265 if (fault == NoFault) {
266 Addr dest_addr = memReq->paddr + offset;
267 // Need to read straight from memory since we have more than 8 bytes.
268 memReq->paddr = thread->copySrcPhysAddr;
269 thread->mem->read(memReq, data);
270 memReq->paddr = dest_addr;
271 thread->mem->write(memReq, data);
272 if (dcacheInterface) {
273 memReq->cmd = Copy;
274 memReq->completionEvent = NULL;
275 memReq->paddr = thread->copySrcPhysAddr;
276 memReq->dest = dest_addr;
277 memReq->size = 64;
278 memReq->time = curTick;
279 memReq->flags &= ~INST_READ;
280 dcacheInterface->access(memReq);
281 }
282 }
283 else
284 assert(!fault->isAlignmentFault());
285
286 return fault;
287#else
288 panic("copy not implemented");
289 return NoFault;
290#endif
291}
292
293#if FULL_SYSTEM
294Addr
295BaseSimpleCPU::dbg_vtophys(Addr addr)
296{
297 return vtophys(tc, addr);
298}
299#endif // FULL_SYSTEM
300
301#if FULL_SYSTEM
302void
303BaseSimpleCPU::post_interrupt(int int_num, int index)
304{
305 BaseCPU::post_interrupt(int_num, index);
306
307 if (thread->status() == ThreadContext::Suspended) {
308 DPRINTF(Quiesce,"Suspended Processor awoke\n");
309 thread->activate();
310 }
311}
312#endif // FULL_SYSTEM
313
314void
315BaseSimpleCPU::checkForInterrupts()
316{
317#if FULL_SYSTEM
318 if (check_interrupts(tc)) {
319 Fault interrupt = interrupts.getInterrupt(tc);
320
321 if (interrupt != NoFault) {
322 interrupts.updateIntrInfo(tc);
323 interrupt->invoke(tc);
324 }
325 }
326#endif
327}
328
329
330Fault
331BaseSimpleCPU::setupFetchRequest(Request *req)
332{
333 Addr threadPC = thread->readPC();
334
335 // set up memory request for instruction fetch
336#if ISA_HAS_DELAY_SLOT
337 DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
338 thread->readNextPC(),thread->readNextNPC());
339#else
340 DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
341 thread->readNextPC());
342#endif
343
344 Addr fetchPC = (threadPC & PCMask) + fetchOffset;
345 req->setVirt(0, fetchPC, sizeof(MachInst), 0, threadPC);
346
347 Fault fault = thread->translateInstReq(req);
348
349 return fault;
350}
351
352
353void
354BaseSimpleCPU::preExecute()
355{
356 // maintain $r0 semantics
357 thread->setIntReg(ZeroReg, 0);
358#if THE_ISA == ALPHA_ISA
359 thread->setFloatReg(ZeroReg, 0.0);
360#endif // ALPHA_ISA
361
362 // check for instruction-count-based events
363 comInstEventQueue[0]->serviceEvents(numInst);
364
365 // decode the instruction
366 inst = gtoh(inst);
367
368 //If we're not in the middle of a macro instruction
369 if (!curMacroStaticInst) {
370
371 StaticInstPtr instPtr = NULL;
372
373 //Predecode, ie bundle up an ExtMachInst
374 //This should go away once the constructor can be set up properly
375 predecoder.setTC(thread->getTC());
376 //If more fetch data is needed, pass it in.
377 Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
378 //if(predecoder.needMoreBytes())
379 predecoder.moreBytes(thread->readPC(), fetchPC, inst);
380 //else
381 // predecoder.process();
382
383 //If an instruction is ready, decode it. Otherwise, we'll have to
384 //fetch beyond the MachInst at the current pc.
385 if (predecoder.extMachInstReady()) {
386#if THE_ISA == X86_ISA
387 thread->setNextPC(thread->readPC() + predecoder.getInstSize());
388#endif // X86_ISA
389 stayAtPC = false;
390 instPtr = StaticInst::decode(predecoder.getExtMachInst(),
391 thread->readPC());
392 } else {
393 stayAtPC = true;
394 fetchOffset += sizeof(MachInst);
395 }
396
397 //If we decoded an instruction and it's microcoded, start pulling
398 //out micro ops
399 if (instPtr && instPtr->isMacroop()) {
400 curMacroStaticInst = instPtr;
401 curStaticInst = curMacroStaticInst->
402 fetchMicroop(thread->readMicroPC());
403 } else {
404 curStaticInst = instPtr;
405 }
406 } else {
407 //Read the next micro op from the macro op
408 curStaticInst = curMacroStaticInst->
409 fetchMicroop(thread->readMicroPC());
410 }
411
412 //If we decoded an instruction this "tick", record information about it.
413 if(curStaticInst)
414 {
415#if TRACING_ON
416 traceData = tracer->getInstRecord(curTick, tc, curStaticInst,
417 thread->readPC());
418
419 DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
420 curStaticInst->getName(), curStaticInst->machInst);
421#endif // TRACING_ON
422
423#if FULL_SYSTEM
424 thread->setInst(inst);
425#endif // FULL_SYSTEM
426 }
427}
428
429void
430BaseSimpleCPU::postExecute()
431{
432#if FULL_SYSTEM
433 if (thread->profile && curStaticInst) {
434 bool usermode = TheISA::inUserMode(tc);
435 thread->profilePC = usermode ? 1 : thread->readPC();
436 ProfileNode *node = thread->profile->consume(tc, curStaticInst);
437 if (node)
438 thread->profileNode = node;
439 }
440#endif
441
442 if (curStaticInst->isMemRef()) {
443 numMemRefs++;
444 }
445
446 if (curStaticInst->isLoad()) {
447 ++numLoad;
448 comLoadEventQueue[0]->serviceEvents(numLoad);
449 }
450
451 traceFunctions(thread->readPC());
452
453 if (traceData) {
454 traceData->dump();
455 delete traceData;
456 traceData = NULL;
457 }
458}
459
460
461void
462BaseSimpleCPU::advancePC(Fault fault)
463{
464 //Since we're moving to a new pc, zero out the offset
465 fetchOffset = 0;
466 if (fault != NoFault) {
467 curMacroStaticInst = StaticInst::nullStaticInstPtr;
468 predecoder.reset();
| 1/*
2 * Copyright (c) 2002-2005 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 */
30
31#include "arch/utility.hh"
32#include "arch/faults.hh"
33#include "base/cprintf.hh"
34#include "base/inifile.hh"
35#include "base/loader/symtab.hh"
36#include "base/misc.hh"
37#include "base/pollevent.hh"
38#include "base/range.hh"
39#include "base/stats/events.hh"
40#include "base/trace.hh"
41#include "cpu/base.hh"
42#include "cpu/exetrace.hh"
43#include "cpu/profile.hh"
44#include "cpu/simple/base.hh"
45#include "cpu/simple_thread.hh"
46#include "cpu/smt.hh"
47#include "cpu/static_inst.hh"
48#include "cpu/thread_context.hh"
49#include "mem/packet.hh"
50#include "sim/byteswap.hh"
51#include "sim/debug.hh"
52#include "sim/host.hh"
53#include "sim/sim_events.hh"
54#include "sim/sim_object.hh"
55#include "sim/stats.hh"
56#include "sim/system.hh"
57
58#if FULL_SYSTEM
59#include "arch/kernel_stats.hh"
60#include "arch/stacktrace.hh"
61#include "arch/tlb.hh"
62#include "arch/vtophys.hh"
63#include "base/remote_gdb.hh"
64#else // !FULL_SYSTEM
65#include "mem/mem_object.hh"
66#endif // FULL_SYSTEM
67
68using namespace std;
69using namespace TheISA;
70
71BaseSimpleCPU::BaseSimpleCPU(Params *p)
72 : BaseCPU(p), traceData(NULL), thread(NULL), predecoder(NULL)
73{
74#if FULL_SYSTEM
75 thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
76#else
77 thread = new SimpleThread(this, /* thread_num */ 0, p->process,
78 p->itb, p->dtb, /* asid */ 0);
79#endif // !FULL_SYSTEM
80
81 thread->setStatus(ThreadContext::Unallocated);
82
83 tc = thread->getTC();
84
85 numInst = 0;
86 startNumInst = 0;
87 numLoad = 0;
88 startNumLoad = 0;
89 lastIcacheStall = 0;
90 lastDcacheStall = 0;
91
92 threadContexts.push_back(tc);
93
94 cpuId = tc->readCpuId();
95
96 fetchOffset = 0;
97 stayAtPC = false;
98}
99
100BaseSimpleCPU::~BaseSimpleCPU()
101{
102}
103
104void
105BaseSimpleCPU::deallocateContext(int thread_num)
106{
107 // for now, these are equivalent
108 suspendContext(thread_num);
109}
110
111
112void
113BaseSimpleCPU::haltContext(int thread_num)
114{
115 // for now, these are equivalent
116 suspendContext(thread_num);
117}
118
119
120void
121BaseSimpleCPU::regStats()
122{
123 using namespace Stats;
124
125 BaseCPU::regStats();
126
127 numInsts
128 .name(name() + ".num_insts")
129 .desc("Number of instructions executed")
130 ;
131
132 numMemRefs
133 .name(name() + ".num_refs")
134 .desc("Number of memory references")
135 ;
136
137 notIdleFraction
138 .name(name() + ".not_idle_fraction")
139 .desc("Percentage of non-idle cycles")
140 ;
141
142 idleFraction
143 .name(name() + ".idle_fraction")
144 .desc("Percentage of idle cycles")
145 ;
146
147 icacheStallCycles
148 .name(name() + ".icache_stall_cycles")
149 .desc("ICache total stall cycles")
150 .prereq(icacheStallCycles)
151 ;
152
153 dcacheStallCycles
154 .name(name() + ".dcache_stall_cycles")
155 .desc("DCache total stall cycles")
156 .prereq(dcacheStallCycles)
157 ;
158
159 icacheRetryCycles
160 .name(name() + ".icache_retry_cycles")
161 .desc("ICache total retry cycles")
162 .prereq(icacheRetryCycles)
163 ;
164
165 dcacheRetryCycles
166 .name(name() + ".dcache_retry_cycles")
167 .desc("DCache total retry cycles")
168 .prereq(dcacheRetryCycles)
169 ;
170
171 idleFraction = constant(1.0) - notIdleFraction;
172}
173
174void
175BaseSimpleCPU::resetStats()
176{
177// startNumInst = numInst;
178 // notIdleFraction = (_status != Idle);
179}
180
181void
182BaseSimpleCPU::serialize(ostream &os)
183{
184 BaseCPU::serialize(os);
185// SERIALIZE_SCALAR(inst);
186 nameOut(os, csprintf("%s.xc.0", name()));
187 thread->serialize(os);
188}
189
190void
191BaseSimpleCPU::unserialize(Checkpoint *cp, const string §ion)
192{
193 BaseCPU::unserialize(cp, section);
194// UNSERIALIZE_SCALAR(inst);
195 thread->unserialize(cp, csprintf("%s.xc.0", section));
196}
197
198void
199change_thread_state(int thread_number, int activate, int priority)
200{
201}
202
203Fault
204BaseSimpleCPU::copySrcTranslate(Addr src)
205{
206#if 0
207 static bool no_warn = true;
208 int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
209 // Only support block sizes of 64 atm.
210 assert(blk_size == 64);
211 int offset = src & (blk_size - 1);
212
213 // Make sure block doesn't span page
214 if (no_warn &&
215 (src & PageMask) != ((src + blk_size) & PageMask) &&
216 (src >> 40) != 0xfffffc) {
217 warn("Copied block source spans pages %x.", src);
218 no_warn = false;
219 }
220
221 memReq->reset(src & ~(blk_size - 1), blk_size);
222
223 // translate to physical address
224 Fault fault = thread->translateDataReadReq(req);
225
226 if (fault == NoFault) {
227 thread->copySrcAddr = src;
228 thread->copySrcPhysAddr = memReq->paddr + offset;
229 } else {
230 assert(!fault->isAlignmentFault());
231
232 thread->copySrcAddr = 0;
233 thread->copySrcPhysAddr = 0;
234 }
235 return fault;
236#else
237 return NoFault;
238#endif
239}
240
241Fault
242BaseSimpleCPU::copy(Addr dest)
243{
244#if 0
245 static bool no_warn = true;
246 int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
247 // Only support block sizes of 64 atm.
248 assert(blk_size == 64);
249 uint8_t data[blk_size];
250 //assert(thread->copySrcAddr);
251 int offset = dest & (blk_size - 1);
252
253 // Make sure block doesn't span page
254 if (no_warn &&
255 (dest & PageMask) != ((dest + blk_size) & PageMask) &&
256 (dest >> 40) != 0xfffffc) {
257 no_warn = false;
258 warn("Copied block destination spans pages %x. ", dest);
259 }
260
261 memReq->reset(dest & ~(blk_size -1), blk_size);
262 // translate to physical address
263 Fault fault = thread->translateDataWriteReq(req);
264
265 if (fault == NoFault) {
266 Addr dest_addr = memReq->paddr + offset;
267 // Need to read straight from memory since we have more than 8 bytes.
268 memReq->paddr = thread->copySrcPhysAddr;
269 thread->mem->read(memReq, data);
270 memReq->paddr = dest_addr;
271 thread->mem->write(memReq, data);
272 if (dcacheInterface) {
273 memReq->cmd = Copy;
274 memReq->completionEvent = NULL;
275 memReq->paddr = thread->copySrcPhysAddr;
276 memReq->dest = dest_addr;
277 memReq->size = 64;
278 memReq->time = curTick;
279 memReq->flags &= ~INST_READ;
280 dcacheInterface->access(memReq);
281 }
282 }
283 else
284 assert(!fault->isAlignmentFault());
285
286 return fault;
287#else
288 panic("copy not implemented");
289 return NoFault;
290#endif
291}
292
293#if FULL_SYSTEM
294Addr
295BaseSimpleCPU::dbg_vtophys(Addr addr)
296{
297 return vtophys(tc, addr);
298}
299#endif // FULL_SYSTEM
300
301#if FULL_SYSTEM
302void
303BaseSimpleCPU::post_interrupt(int int_num, int index)
304{
305 BaseCPU::post_interrupt(int_num, index);
306
307 if (thread->status() == ThreadContext::Suspended) {
308 DPRINTF(Quiesce,"Suspended Processor awoke\n");
309 thread->activate();
310 }
311}
312#endif // FULL_SYSTEM
313
314void
315BaseSimpleCPU::checkForInterrupts()
316{
317#if FULL_SYSTEM
318 if (check_interrupts(tc)) {
319 Fault interrupt = interrupts.getInterrupt(tc);
320
321 if (interrupt != NoFault) {
322 interrupts.updateIntrInfo(tc);
323 interrupt->invoke(tc);
324 }
325 }
326#endif
327}
328
329
330Fault
331BaseSimpleCPU::setupFetchRequest(Request *req)
332{
333 Addr threadPC = thread->readPC();
334
335 // set up memory request for instruction fetch
336#if ISA_HAS_DELAY_SLOT
337 DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",threadPC,
338 thread->readNextPC(),thread->readNextNPC());
339#else
340 DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p\n",threadPC,
341 thread->readNextPC());
342#endif
343
344 Addr fetchPC = (threadPC & PCMask) + fetchOffset;
345 req->setVirt(0, fetchPC, sizeof(MachInst), 0, threadPC);
346
347 Fault fault = thread->translateInstReq(req);
348
349 return fault;
350}
351
352
353void
354BaseSimpleCPU::preExecute()
355{
356 // maintain $r0 semantics
357 thread->setIntReg(ZeroReg, 0);
358#if THE_ISA == ALPHA_ISA
359 thread->setFloatReg(ZeroReg, 0.0);
360#endif // ALPHA_ISA
361
362 // check for instruction-count-based events
363 comInstEventQueue[0]->serviceEvents(numInst);
364
365 // decode the instruction
366 inst = gtoh(inst);
367
368 //If we're not in the middle of a macro instruction
369 if (!curMacroStaticInst) {
370
371 StaticInstPtr instPtr = NULL;
372
373 //Predecode, ie bundle up an ExtMachInst
374 //This should go away once the constructor can be set up properly
375 predecoder.setTC(thread->getTC());
376 //If more fetch data is needed, pass it in.
377 Addr fetchPC = (thread->readPC() & PCMask) + fetchOffset;
378 //if(predecoder.needMoreBytes())
379 predecoder.moreBytes(thread->readPC(), fetchPC, inst);
380 //else
381 // predecoder.process();
382
383 //If an instruction is ready, decode it. Otherwise, we'll have to
384 //fetch beyond the MachInst at the current pc.
385 if (predecoder.extMachInstReady()) {
386#if THE_ISA == X86_ISA
387 thread->setNextPC(thread->readPC() + predecoder.getInstSize());
388#endif // X86_ISA
389 stayAtPC = false;
390 instPtr = StaticInst::decode(predecoder.getExtMachInst(),
391 thread->readPC());
392 } else {
393 stayAtPC = true;
394 fetchOffset += sizeof(MachInst);
395 }
396
397 //If we decoded an instruction and it's microcoded, start pulling
398 //out micro ops
399 if (instPtr && instPtr->isMacroop()) {
400 curMacroStaticInst = instPtr;
401 curStaticInst = curMacroStaticInst->
402 fetchMicroop(thread->readMicroPC());
403 } else {
404 curStaticInst = instPtr;
405 }
406 } else {
407 //Read the next micro op from the macro op
408 curStaticInst = curMacroStaticInst->
409 fetchMicroop(thread->readMicroPC());
410 }
411
412 //If we decoded an instruction this "tick", record information about it.
413 if(curStaticInst)
414 {
415#if TRACING_ON
416 traceData = tracer->getInstRecord(curTick, tc, curStaticInst,
417 thread->readPC());
418
419 DPRINTF(Decode,"Decode: Decoded %s instruction: 0x%x\n",
420 curStaticInst->getName(), curStaticInst->machInst);
421#endif // TRACING_ON
422
423#if FULL_SYSTEM
424 thread->setInst(inst);
425#endif // FULL_SYSTEM
426 }
427}
428
429void
430BaseSimpleCPU::postExecute()
431{
432#if FULL_SYSTEM
433 if (thread->profile && curStaticInst) {
434 bool usermode = TheISA::inUserMode(tc);
435 thread->profilePC = usermode ? 1 : thread->readPC();
436 ProfileNode *node = thread->profile->consume(tc, curStaticInst);
437 if (node)
438 thread->profileNode = node;
439 }
440#endif
441
442 if (curStaticInst->isMemRef()) {
443 numMemRefs++;
444 }
445
446 if (curStaticInst->isLoad()) {
447 ++numLoad;
448 comLoadEventQueue[0]->serviceEvents(numLoad);
449 }
450
451 traceFunctions(thread->readPC());
452
453 if (traceData) {
454 traceData->dump();
455 delete traceData;
456 traceData = NULL;
457 }
458}
459
460
461void
462BaseSimpleCPU::advancePC(Fault fault)
463{
464 //Since we're moving to a new pc, zero out the offset
465 fetchOffset = 0;
466 if (fault != NoFault) {
467 curMacroStaticInst = StaticInst::nullStaticInstPtr;
468 predecoder.reset();
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