faults.cc revision 4111 
1/*
2 * Copyright (c) 2003-2005 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: Gabe Black
29 *          Kevin Lim
30 */
31
32#include <algorithm>
33
34#include "arch/sparc/faults.hh"
35#include "arch/sparc/isa_traits.hh"
36#include "arch/sparc/types.hh"
37#include "base/bitfield.hh"
38#include "base/trace.hh"
39#include "config/full_system.hh"
40#include "cpu/base.hh"
41#include "cpu/thread_context.hh"
42#if !FULL_SYSTEM
43#include "arch/sparc/process.hh"
44#include "mem/page_table.hh"
45#include "sim/process.hh"
46#endif
47
48using namespace std;
49
50namespace SparcISA
51{
52
53template<> SparcFaultBase::FaultVals
54    SparcFault<PowerOnReset>::vals =
55    {"power_on_reset", 0x001, 0, {H, H, H}};
56
57template<> SparcFaultBase::FaultVals
58    SparcFault<WatchDogReset>::vals =
59    {"watch_dog_reset", 0x002, 120, {H, H, H}};
60
61template<> SparcFaultBase::FaultVals
62    SparcFault<ExternallyInitiatedReset>::vals =
63    {"externally_initiated_reset", 0x003, 110, {H, H, H}};
64
65template<> SparcFaultBase::FaultVals
66    SparcFault<SoftwareInitiatedReset>::vals =
67    {"software_initiated_reset", 0x004, 130, {SH, SH, H}};
68
69template<> SparcFaultBase::FaultVals
70    SparcFault<REDStateException>::vals =
71    {"RED_state_exception", 0x005, 1, {H, H, H}};
72
73template<> SparcFaultBase::FaultVals
74    SparcFault<StoreError>::vals =
75    {"store_error", 0x007, 201, {H, H, H}};
76
77template<> SparcFaultBase::FaultVals
78    SparcFault<InstructionAccessException>::vals =
79    {"instruction_access_exception", 0x008, 300, {H, H, H}};
80
81//XXX This trap is apparently dropped from ua2005
82/*template<> SparcFaultBase::FaultVals
83    SparcFault<InstructionAccessMMUMiss>::vals =
84    {"inst_mmu", 0x009, 2, {H, H, H}};*/
85
86template<> SparcFaultBase::FaultVals
87    SparcFault<InstructionAccessError>::vals =
88    {"instruction_access_error", 0x00A, 400, {H, H, H}};
89
90template<> SparcFaultBase::FaultVals
91    SparcFault<IllegalInstruction>::vals =
92    {"illegal_instruction", 0x010, 620, {H, H, H}};
93
94template<> SparcFaultBase::FaultVals
95    SparcFault<PrivilegedOpcode>::vals =
96    {"privileged_opcode", 0x011, 700, {P, SH, SH}};
97
98//XXX This trap is apparently dropped from ua2005
99/*template<> SparcFaultBase::FaultVals
100    SparcFault<UnimplementedLDD>::vals =
101    {"unimp_ldd", 0x012, 6, {H, H, H}};*/
102
103//XXX This trap is apparently dropped from ua2005
104/*template<> SparcFaultBase::FaultVals
105    SparcFault<UnimplementedSTD>::vals =
106    {"unimp_std", 0x013, 6, {H, H, H}};*/
107
108template<> SparcFaultBase::FaultVals
109    SparcFault<FpDisabled>::vals =
110    {"fp_disabled", 0x020, 800, {P, P, H}};
111
112template<> SparcFaultBase::FaultVals
113    SparcFault<FpExceptionIEEE754>::vals =
114    {"fp_exception_ieee_754", 0x021, 1110, {P, P, H}};
115
116template<> SparcFaultBase::FaultVals
117    SparcFault<FpExceptionOther>::vals =
118    {"fp_exception_other", 0x022, 1110, {P, P, H}};
119
120template<> SparcFaultBase::FaultVals
121    SparcFault<TagOverflow>::vals =
122    {"tag_overflow", 0x023, 1400, {P, P, H}};
123
124template<> SparcFaultBase::FaultVals
125    SparcFault<CleanWindow>::vals =
126    {"clean_window", 0x024, 1010, {P, P, H}};
127
128template<> SparcFaultBase::FaultVals
129    SparcFault<DivisionByZero>::vals =
130    {"division_by_zero", 0x028, 1500, {P, P, H}};
131
132template<> SparcFaultBase::FaultVals
133    SparcFault<InternalProcessorError>::vals =
134    {"internal_processor_error", 0x029, 4, {H, H, H}};
135
136template<> SparcFaultBase::FaultVals
137    SparcFault<InstructionInvalidTSBEntry>::vals =
138    {"instruction_invalid_tsb_entry", 0x02A, 210, {H, H, SH}};
139
140template<> SparcFaultBase::FaultVals
141    SparcFault<DataInvalidTSBEntry>::vals =
142    {"data_invalid_tsb_entry", 0x02B, 1203, {H, H, H}};
143
144template<> SparcFaultBase::FaultVals
145    SparcFault<DataAccessException>::vals =
146    {"data_access_exception", 0x030, 1201, {H, H, H}};
147
148//XXX This trap is apparently dropped from ua2005
149/*template<> SparcFaultBase::FaultVals
150    SparcFault<DataAccessMMUMiss>::vals =
151    {"data_mmu", 0x031, 12, {H, H, H}};*/
152
153template<> SparcFaultBase::FaultVals
154    SparcFault<DataAccessError>::vals =
155    {"data_access_error", 0x032, 1210, {H, H, H}};
156
157template<> SparcFaultBase::FaultVals
158    SparcFault<DataAccessProtection>::vals =
159    {"data_access_protection", 0x033, 1207, {H, H, H}};
160
161template<> SparcFaultBase::FaultVals
162    SparcFault<MemAddressNotAligned>::vals =
163    {"mem_address_not_aligned", 0x034, 1020, {H, H, H}};
164
165template<> SparcFaultBase::FaultVals
166    SparcFault<LDDFMemAddressNotAligned>::vals =
167    {"LDDF_mem_address_not_aligned", 0x035, 1010, {H, H, H}};
168
169template<> SparcFaultBase::FaultVals
170    SparcFault<STDFMemAddressNotAligned>::vals =
171    {"STDF_mem_address_not_aligned", 0x036, 1010, {H, H, H}};
172
173template<> SparcFaultBase::FaultVals
174    SparcFault<PrivilegedAction>::vals =
175    {"privileged_action", 0x037, 1110, {H, H, SH}};
176
177template<> SparcFaultBase::FaultVals
178    SparcFault<LDQFMemAddressNotAligned>::vals =
179    {"LDQF_mem_address_not_aligned", 0x038, 1010, {H, H, H}};
180
181template<> SparcFaultBase::FaultVals
182    SparcFault<STQFMemAddressNotAligned>::vals =
183    {"STQF_mem_address_not_aligned", 0x039, 1010, {H, H, H}};
184
185template<> SparcFaultBase::FaultVals
186    SparcFault<InstructionRealTranslationMiss>::vals =
187    {"instruction_real_translation_miss", 0x03E, 208, {H, H, SH}};
188
189template<> SparcFaultBase::FaultVals
190    SparcFault<DataRealTranslationMiss>::vals =
191    {"data_real_translation_miss", 0x03F, 1203, {H, H, H}};
192
193//XXX This trap is apparently dropped from ua2005
194/*template<> SparcFaultBase::FaultVals
195    SparcFault<AsyncDataError>::vals =
196    {"async_data", 0x040, 2, {H, H, H}};*/
197
198template<> SparcFaultBase::FaultVals
199    SparcFault<InterruptLevelN>::vals =
200    {"interrupt_level_n", 0x040, 0, {P, P, SH}};
201
202template<> SparcFaultBase::FaultVals
203    SparcFault<HstickMatch>::vals =
204    {"hstick_match", 0x05E, 1601, {H, H, H}};
205
206template<> SparcFaultBase::FaultVals
207    SparcFault<TrapLevelZero>::vals =
208    {"trap_level_zero", 0x05F, 202, {H, H, SH}};
209
210template<> SparcFaultBase::FaultVals
211    SparcFault<PAWatchpoint>::vals =
212    {"PA_watchpoint", 0x061, 1209, {H, H, H}};
213
214template<> SparcFaultBase::FaultVals
215    SparcFault<VAWatchpoint>::vals =
216    {"VA_watchpoint", 0x062, 1120, {P, P, SH}};
217
218template<> SparcFaultBase::FaultVals
219    SparcFault<FastInstructionAccessMMUMiss>::vals =
220    {"fast_instruction_access_MMU_miss", 0x064, 208, {H, H, SH}};
221
222template<> SparcFaultBase::FaultVals
223    SparcFault<FastDataAccessMMUMiss>::vals =
224    {"fast_data_access_MMU_miss", 0x068, 1203, {H, H, H}};
225
226template<> SparcFaultBase::FaultVals
227    SparcFault<FastDataAccessProtection>::vals =
228    {"fast_data_access_protection", 0x06C, 1207, {H, H, H}};
229
230template<> SparcFaultBase::FaultVals
231    SparcFault<InstructionBreakpoint>::vals =
232    {"instruction_break", 0x076, 610, {H, H, H}};
233
234template<> SparcFaultBase::FaultVals
235    SparcFault<CpuMondo>::vals =
236    {"cpu_mondo", 0x07C, 1608, {P, P, SH}};
237
238template<> SparcFaultBase::FaultVals
239    SparcFault<DevMondo>::vals =
240    {"dev_mondo", 0x07D, 1611, {P, P, SH}};
241
242template<> SparcFaultBase::FaultVals
243    SparcFault<ResumableError>::vals =
244    {"resume_error", 0x07E, 3330, {P, P, SH}};
245
246template<> SparcFaultBase::FaultVals
247    SparcFault<SpillNNormal>::vals =
248    {"spill_n_normal", 0x080, 900, {P, P, H}};
249
250template<> SparcFaultBase::FaultVals
251    SparcFault<SpillNOther>::vals =
252    {"spill_n_other", 0x0A0, 900, {P, P, H}};
253
254template<> SparcFaultBase::FaultVals
255    SparcFault<FillNNormal>::vals =
256    {"fill_n_normal", 0x0C0, 900, {P, P, H}};
257
258template<> SparcFaultBase::FaultVals
259    SparcFault<FillNOther>::vals =
260    {"fill_n_other", 0x0E0, 900, {P, P, H}};
261
262template<> SparcFaultBase::FaultVals
263    SparcFault<TrapInstruction>::vals =
264    {"trap_instruction", 0x100, 1602, {P, P, H}};
265
266#if !FULL_SYSTEM
267template<> SparcFaultBase::FaultVals
268    SparcFault<PageTableFault>::vals =
269    {"page_table_fault", 0x0000, 0, {SH, SH, SH}};
270#endif
271
272/**
273 * This causes the thread context to enter RED state. This causes the side
274 * effects which go with entering RED state because of a trap.
275 */
276
277void enterREDState(ThreadContext *tc)
278{
279    //@todo Disable the mmu?
280    //@todo Disable watchpoints?
281    MiscReg HPSTATE = tc->readMiscReg(MISCREG_HPSTATE);
282    //HPSTATE.red = 1
283    HPSTATE |= (1 << 5);
284    //HPSTATE.hpriv = 1
285    HPSTATE |= (1 << 2);
286    tc->setMiscRegWithEffect(MISCREG_HPSTATE, HPSTATE);
287    //PSTATE.priv is set to 1 here. The manual says it should be 0, but
288    //Legion sets it to 1.
289    MiscReg PSTATE = tc->readMiscReg(MISCREG_PSTATE);
290    PSTATE |= (1 << 2);
291    tc->setMiscRegWithEffect(MISCREG_PSTATE, PSTATE);
292}
293
294/**
295 * This sets everything up for a RED state trap except for actually jumping to
296 * the handler.
297 */
298
299void doREDFault(ThreadContext *tc, TrapType tt)
300{
301    MiscReg TL = tc->readMiscReg(MISCREG_TL);
302    MiscReg TSTATE = tc->readMiscReg(MISCREG_TSTATE);
303    MiscReg PSTATE = tc->readMiscReg(MISCREG_PSTATE);
304    MiscReg HPSTATE = tc->readMiscReg(MISCREG_HPSTATE);
305    //MiscReg CCR = tc->readMiscReg(MISCREG_CCR);
306    MiscReg CCR = tc->readIntReg(NumIntArchRegs + 2);
307    MiscReg ASI = tc->readMiscReg(MISCREG_ASI);
308    MiscReg CWP = tc->readMiscReg(MISCREG_CWP);
309    //MiscReg CANSAVE = tc->readMiscReg(MISCREG_CANSAVE);
310    MiscReg CANSAVE = tc->readMiscReg(NumIntArchRegs + 3);
311    MiscReg GL = tc->readMiscReg(MISCREG_GL);
312    MiscReg PC = tc->readPC();
313    MiscReg NPC = tc->readNextPC();
314
315    TL++;
316
317    if (bits(PSTATE, 3,3)) {
318        PC &= mask(32);
319        NPC &= mask(32);
320    }
321
322    //set TSTATE.gl to gl
323    replaceBits(TSTATE, 42, 40, GL);
324    //set TSTATE.ccr to ccr
325    replaceBits(TSTATE, 39, 32, CCR);
326    //set TSTATE.asi to asi
327    replaceBits(TSTATE, 31, 24, ASI);
328    //set TSTATE.pstate to pstate
329    replaceBits(TSTATE, 20, 8, PSTATE);
330    //set TSTATE.cwp to cwp
331    replaceBits(TSTATE, 4, 0, CWP);
332
333    //Write back TSTATE
334    tc->setMiscReg(MISCREG_TSTATE, TSTATE);
335
336    //set TPC to PC
337    tc->setMiscReg(MISCREG_TPC, PC);
338    //set TNPC to NPC
339    tc->setMiscReg(MISCREG_TNPC, NPC);
340
341    //set HTSTATE.hpstate to hpstate
342    tc->setMiscReg(MISCREG_HTSTATE, HPSTATE);
343
344    //TT = trap type;
345    tc->setMiscReg(MISCREG_TT, tt);
346
347    //Update GL
348    tc->setMiscRegWithEffect(MISCREG_GL, min<int>(GL+1, MaxGL));
349
350    PSTATE = mbits(PSTATE, 2, 2); // just save the priv bit
351    PSTATE |= (1 << 4); //set PSTATE.pef to 1
352    tc->setMiscReg(MISCREG_PSTATE, PSTATE);
353
354    //set HPSTATE.red to 1
355    HPSTATE |= (1 << 5);
356    //set HPSTATE.hpriv to 1
357    HPSTATE |= (1 << 2);
358    //set HPSTATE.ibe to 0
359    HPSTATE &= ~(1 << 10);
360    //set HPSTATE.tlz to 0
361    HPSTATE &= ~(1 << 0);
362    tc->setMiscReg(MISCREG_HPSTATE, HPSTATE);
363
364    bool changedCWP = true;
365    if(tt == 0x24)
366        CWP++;
367    else if(0x80 <= tt && tt <= 0xbf)
368        CWP += (CANSAVE + 2);
369    else if(0xc0 <= tt && tt <= 0xff)
370        CWP--;
371    else
372        changedCWP = false;
373
374    if(changedCWP)
375    {
376        CWP = (CWP + NWindows) % NWindows;
377        tc->setMiscRegWithEffect(MISCREG_CWP, CWP);
378    }
379}
380
381/**
382 * This sets everything up for a normal trap except for actually jumping to
383 * the handler.
384 */
385
386void doNormalFault(ThreadContext *tc, TrapType tt, bool gotoHpriv)
387{
388    MiscReg TL = tc->readMiscReg(MISCREG_TL);
389    MiscReg TSTATE = tc->readMiscReg(MISCREG_TSTATE);
390    MiscReg PSTATE = tc->readMiscReg(MISCREG_PSTATE);
391    MiscReg HPSTATE = tc->readMiscReg(MISCREG_HPSTATE);
392    //MiscReg CCR = tc->readMiscReg(MISCREG_CCR);
393    MiscReg CCR = tc->readIntReg(NumIntArchRegs + 2);
394    MiscReg ASI = tc->readMiscReg(MISCREG_ASI);
395    MiscReg CWP = tc->readMiscReg(MISCREG_CWP);
396    //MiscReg CANSAVE = tc->readMiscReg(MISCREG_CANSAVE);
397    MiscReg CANSAVE = tc->readIntReg(NumIntArchRegs + 3);
398    MiscReg GL = tc->readMiscReg(MISCREG_GL);
399    MiscReg PC = tc->readPC();
400    MiscReg NPC = tc->readNextPC();
401
402    if (bits(PSTATE, 3,3)) {
403        PC &= mask(32);
404        NPC &= mask(32);
405    }
406
407    //Increment the trap level
408    TL++;
409    tc->setMiscReg(MISCREG_TL, TL);
410
411    //Save off state
412
413    //set TSTATE.gl to gl
414    replaceBits(TSTATE, 42, 40, GL);
415    //set TSTATE.ccr to ccr
416    replaceBits(TSTATE, 39, 32, CCR);
417    //set TSTATE.asi to asi
418    replaceBits(TSTATE, 31, 24, ASI);
419    //set TSTATE.pstate to pstate
420    replaceBits(TSTATE, 20, 8, PSTATE);
421    //set TSTATE.cwp to cwp
422    replaceBits(TSTATE, 4, 0, CWP);
423
424    //Write back TSTATE
425    tc->setMiscReg(MISCREG_TSTATE, TSTATE);
426
427    //set TPC to PC
428    tc->setMiscReg(MISCREG_TPC, PC);
429    //set TNPC to NPC
430    tc->setMiscReg(MISCREG_TNPC, NPC);
431
432    //set HTSTATE.hpstate to hpstate
433    tc->setMiscReg(MISCREG_HTSTATE, HPSTATE);
434
435    //TT = trap type;
436    tc->setMiscReg(MISCREG_TT, tt);
437
438    //Update the global register level
439    if (!gotoHpriv)
440        tc->setMiscRegWithEffect(MISCREG_GL, min<int>(GL+1, MaxPGL));
441    else
442        tc->setMiscRegWithEffect(MISCREG_GL, min<int>(GL+1, MaxGL));
443
444    //PSTATE.mm is unchanged
445    PSTATE |= (1 << 4); //PSTATE.pef = whether or not an fpu is present
446    PSTATE &= ~(1 << 3); //PSTATE.am = 0
447    PSTATE &= ~(1 << 1); //PSTATE.ie = 0
448    //PSTATE.tle is unchanged
449    //PSTATE.tct = 0
450
451    if (gotoHpriv)
452    {
453        PSTATE &= ~(1 << 9); // PSTATE.cle = 0
454        //The manual says PSTATE.priv should be 0, but Legion leaves it alone
455        HPSTATE &= ~(1 << 5); //HPSTATE.red = 0
456        HPSTATE |= (1 << 2); //HPSTATE.hpriv = 1
457        HPSTATE &= ~(1 << 10); //HPSTATE.ibe = 0
458        //HPSTATE.tlz is unchanged
459        tc->setMiscReg(MISCREG_HPSTATE, HPSTATE);
460    } else { // we are going to priv
461        PSTATE |= (1 << 2); //PSTATE.priv = 1
462        replaceBits(PSTATE, 9, 9, PSTATE >> 8); //PSTATE.cle = PSTATE.tle
463    }
464    tc->setMiscReg(MISCREG_PSTATE, PSTATE);
465
466
467    bool changedCWP = true;
468    if (tt == 0x24)
469        CWP++;
470    else if (0x80 <= tt && tt <= 0xbf)
471        CWP += (CANSAVE + 2);
472    else if (0xc0 <= tt && tt <= 0xff)
473        CWP--;
474    else
475        changedCWP = false;
476
477    if (changedCWP)
478    {
479        CWP = (CWP + NWindows) % NWindows;
480        tc->setMiscRegWithEffect(MISCREG_CWP, CWP);
481    }
482}
483
484void getREDVector(MiscReg TT, Addr & PC, Addr & NPC)
485{
486    //XXX The following constant might belong in a header file.
487    const Addr RSTVAddr = 0xFFF0000000ULL;
488    PC = RSTVAddr | ((TT << 5) & 0xFF);
489    NPC = PC + sizeof(MachInst);
490}
491
492void getHyperVector(ThreadContext * tc, Addr & PC, Addr & NPC, MiscReg TT)
493{
494    Addr HTBA = tc->readMiscReg(MISCREG_HTBA);
495    PC = (HTBA & ~mask(14)) | ((TT << 5) & mask(14));
496    NPC = PC + sizeof(MachInst);
497}
498
499void getPrivVector(ThreadContext * tc, Addr & PC, Addr & NPC, MiscReg TT, MiscReg TL)
500{
501    Addr TBA = tc->readMiscReg(MISCREG_TBA);
502    PC = (TBA & ~mask(15)) |
503        (TL > 1 ? (1 << 14) : 0) |
504        ((TT << 5) & mask(14));
505    NPC = PC + sizeof(MachInst);
506}
507
508#if FULL_SYSTEM
509
510void SparcFaultBase::invoke(ThreadContext * tc)
511{
512    //panic("Invoking a second fault!\n");
513    FaultBase::invoke(tc);
514    countStat()++;
515
516    //We can refer to this to see what the trap level -was-, but something
517    //in the middle could change it in the regfile out from under us.
518    MiscReg tl = tc->readMiscReg(MISCREG_TL);
519    MiscReg tt = tc->readMiscReg(MISCREG_TT);
520    MiscReg pstate = tc->readMiscReg(MISCREG_PSTATE);
521    MiscReg hpstate = tc->readMiscReg(MISCREG_HPSTATE);
522
523    Addr PC, NPC;
524
525    PrivilegeLevel current;
526    if (hpstate & HPSTATE::hpriv)
527        current = Hyperprivileged;
528    else if (pstate & PSTATE::priv)
529        current = Privileged;
530    else
531        current = User;
532
533    PrivilegeLevel level = getNextLevel(current);
534
535    if ((hpstate & HPSTATE::red) || (tl == MaxTL - 1)) {
536        getREDVector(5, PC, NPC);
537        doREDFault(tc, tt);
538        //This changes the hpstate and pstate, so we need to make sure we
539        //save the old version on the trap stack in doREDFault.
540        enterREDState(tc);
541    } else if (tl == MaxTL) {
542        panic("Should go to error state here.. crap\n");
543        //Do error_state somehow?
544        //Probably inject a WDR fault using the interrupt mechanism.
545        //What should the PC and NPC be set to?
546    } else if (tl > MaxPTL && level == Privileged) {
547        //guest_watchdog fault
548        doNormalFault(tc, trapType(), true);
549        getHyperVector(tc, PC, NPC, 2);
550    } else if (level == Hyperprivileged ||
551            level == Privileged && trapType() >= 384) {
552        doNormalFault(tc, trapType(), true);
553        getHyperVector(tc, PC, NPC, trapType());
554    } else {
555        doNormalFault(tc, trapType(), false);
556        getPrivVector(tc, PC, NPC, trapType(), tl+1);
557    }
558
559    tc->setPC(PC);
560    tc->setNextPC(NPC);
561    tc->setNextNPC(NPC + sizeof(MachInst));
562}
563
564void PowerOnReset::invoke(ThreadContext * tc)
565{
566    //For SPARC, when a system is first started, there is a power
567    //on reset Trap which sets the processor into the following state.
568    //Bits that aren't set aren't defined on startup.
569
570    tc->setMiscReg(MISCREG_TL, MaxTL);
571    tc->setMiscReg(MISCREG_TT, trapType());
572    tc->setMiscRegWithEffect(MISCREG_GL, MaxGL);
573
574    //Turn on pef and priv, set everything else to 0
575    tc->setMiscReg(MISCREG_PSTATE, (1 << 4) | (1 << 2));
576
577    //Turn on red and hpriv, set everything else to 0
578    MiscReg HPSTATE = tc->readMiscReg(MISCREG_HPSTATE);
579    //HPSTATE.red = 1
580    HPSTATE |= (1 << 5);
581    //HPSTATE.hpriv = 1
582    HPSTATE |= (1 << 2);
583    //HPSTATE.ibe = 0
584    HPSTATE &= ~(1 << 10);
585    //HPSTATE.tlz = 0
586    HPSTATE &= ~(1 << 0);
587    tc->setMiscReg(MISCREG_HPSTATE, HPSTATE);
588
589    //The tick register is unreadable by nonprivileged software
590    tc->setMiscReg(MISCREG_TICK, 1ULL << 63);
591
592    //Enter RED state. We do this last so that the actual state preserved in
593    //the trap stack is the state from before this fault.
594    enterREDState(tc);
595
596    Addr PC, NPC;
597    getREDVector(trapType(), PC, NPC);
598    tc->setPC(PC);
599    tc->setNextPC(NPC);
600    tc->setNextNPC(NPC + sizeof(MachInst));
601
602    //These registers are specified as "undefined" after a POR, and they
603    //should have reasonable values after the miscregfile is reset
604    /*
605    // Clear all the soft interrupt bits
606    softint = 0;
607    // disable timer compare interrupts, reset tick_cmpr
608    tc->setMiscReg(MISCREG_
609    tick_cmprFields.int_dis = 1;
610    tick_cmprFields.tick_cmpr = 0; // Reset to 0 for pretty printing
611    stickFields.npt = 1; //The TICK register is unreadable by by !priv
612    stick_cmprFields.int_dis = 1; // disable timer compare interrupts
613    stick_cmprFields.tick_cmpr = 0; // Reset to 0 for pretty printing
614
615    tt[tl] = _trapType;
616
617    hintp = 0; // no interrupts pending
618    hstick_cmprFields.int_dis = 1; // disable timer compare interrupts
619    hstick_cmprFields.tick_cmpr = 0; // Reset to 0 for pretty printing
620    */
621}
622
623#else // !FULL_SYSTEM
624
625void SpillNNormal::invoke(ThreadContext *tc)
626{
627    doNormalFault(tc, trapType(), false);
628
629    Process *p = tc->getProcessPtr();
630
631    //XXX This will only work in faults from a SparcLiveProcess
632    SparcLiveProcess *lp = dynamic_cast<SparcLiveProcess *>(p);
633    assert(lp);
634
635    //Then adjust the PC and NPC
636    Addr spillStart = lp->readSpillStart();
637    tc->setPC(spillStart);
638    tc->setNextPC(spillStart + sizeof(MachInst));
639    tc->setNextNPC(spillStart + 2*sizeof(MachInst));
640}
641
642void FillNNormal::invoke(ThreadContext *tc)
643{
644    doNormalFault(tc, trapType(), false);
645
646    Process * p = tc->getProcessPtr();
647
648    //XXX This will only work in faults from a SparcLiveProcess
649    SparcLiveProcess *lp = dynamic_cast<SparcLiveProcess *>(p);
650    assert(lp);
651
652    //Then adjust the PC and NPC
653    Addr fillStart = lp->readFillStart();
654    tc->setPC(fillStart);
655    tc->setNextPC(fillStart + sizeof(MachInst));
656    tc->setNextNPC(fillStart + 2*sizeof(MachInst));
657}
658
659void TrapInstruction::invoke(ThreadContext *tc)
660{
661    //In SE, this mechanism is how the process requests a service from the
662    //operating system. We'll get the process object from the thread context
663    //and let it service the request.
664
665    Process *p = tc->getProcessPtr();
666
667    SparcLiveProcess *lp = dynamic_cast<SparcLiveProcess *>(p);
668    assert(lp);
669
670    lp->handleTrap(_n, tc);
671
672    //We need to explicitly advance the pc, since that's not done for us
673    //on a faulting instruction
674    tc->setPC(tc->readNextPC());
675    tc->setNextPC(tc->readNextNPC());
676    tc->setNextNPC(tc->readNextNPC() + sizeof(MachInst));
677}
678
679void PageTableFault::invoke(ThreadContext *tc)
680{
681    Process *p = tc->getProcessPtr();
682
683    // We've accessed the next page of the stack, so extend the stack
684    // to cover it.
685    if(vaddr < p->stack_min && vaddr >= p->stack_min - PageBytes)
686    {
687        p->stack_min -= PageBytes;
688        if(p->stack_base - p->stack_min > 8*1024*1024)
689            fatal("Over max stack size for one thread\n");
690        p->pTable->allocate(p->stack_min, PageBytes);
691        warn("Increasing stack size by one page.");
692    }
693    // Otherwise, we have an unexpected page fault. Report that fact,
694    // and what address was accessed to cause the fault.
695    else
696    {
697        panic("Page table fault when accessing virtual address %#x\n", vaddr);
698    }
699}
700
701#endif
702
703} // namespace SparcISA
704
705