summaryrefslogtreecommitdiffstats
path: root/qemu/target-mips/helper.c
blob: 04ba19fd4444563a0dc20a003085bb9e81555a21 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
/*
 *  MIPS emulation helpers for qemu.
 *
 *  Copyright (c) 2004-2005 Jocelyn Mayer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <signal.h>

#include "cpu.h"
#include "sysemu/kvm.h"
#include "exec/cpu_ldst.h"

enum {
    TLBRET_XI = -6,
    TLBRET_RI = -5,
    TLBRET_DIRTY = -4,
    TLBRET_INVALID = -3,
    TLBRET_NOMATCH = -2,
    TLBRET_BADADDR = -1,
    TLBRET_MATCH = 0
};

#if !defined(CONFIG_USER_ONLY)

/* no MMU emulation */
int no_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
                        target_ulong address, int rw, int access_type)
{
    *physical = address;
    *prot = PAGE_READ | PAGE_WRITE;
    return TLBRET_MATCH;
}

/* fixed mapping MMU emulation */
int fixed_mmu_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
                           target_ulong address, int rw, int access_type)
{
    if (address <= (int32_t)0x7FFFFFFFUL) {
        if (!(env->CP0_Status & (1 << CP0St_ERL)))
            *physical = address + 0x40000000UL;
        else
            *physical = address;
    } else if (address <= (int32_t)0xBFFFFFFFUL)
        *physical = address & 0x1FFFFFFF;
    else
        *physical = address;

    *prot = PAGE_READ | PAGE_WRITE;
    return TLBRET_MATCH;
}

/* MIPS32/MIPS64 R4000-style MMU emulation */
int r4k_map_address (CPUMIPSState *env, hwaddr *physical, int *prot,
                     target_ulong address, int rw, int access_type)
{
    uint8_t ASID = env->CP0_EntryHi & 0xFF;
    int i;

    for (i = 0; i < env->tlb->tlb_in_use; i++) {
        r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i];
        /* 1k pages are not supported. */
        target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
        target_ulong tag = address & ~mask;
        target_ulong VPN = tlb->VPN & ~mask;
#if defined(TARGET_MIPS64)
        tag &= env->SEGMask;
#endif

        /* Check ASID, virtual page number & size */
        if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag && !tlb->EHINV) {
            /* TLB match */
            int n = !!(address & mask & ~(mask >> 1));
            /* Check access rights */
            if (!(n ? tlb->V1 : tlb->V0)) {
                return TLBRET_INVALID;
            }
            if (rw == MMU_INST_FETCH && (n ? tlb->XI1 : tlb->XI0)) {
                return TLBRET_XI;
            }
            if (rw == MMU_DATA_LOAD && (n ? tlb->RI1 : tlb->RI0)) {
                return TLBRET_RI;
            }
            if (rw != MMU_DATA_STORE || (n ? tlb->D1 : tlb->D0)) {
                *physical = tlb->PFN[n] | (address & (mask >> 1));
                *prot = PAGE_READ;
                if (n ? tlb->D1 : tlb->D0)
                    *prot |= PAGE_WRITE;
                return TLBRET_MATCH;
            }
            return TLBRET_DIRTY;
        }
    }
    return TLBRET_NOMATCH;
}

static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
                                int *prot, target_ulong real_address,
                                int rw, int access_type)
{
    /* User mode can only access useg/xuseg */
    int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
    int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
    int kernel_mode = !user_mode && !supervisor_mode;
#if defined(TARGET_MIPS64)
    int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
    int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
    int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
#endif
    int ret = TLBRET_MATCH;
    /* effective address (modified for KVM T&E kernel segments) */
    target_ulong address = real_address;

#if 0
    qemu_log("user mode %d h %08x\n", user_mode, env->hflags);
#endif

#define USEG_LIMIT      0x7FFFFFFFUL
#define KSEG0_BASE      0x80000000UL
#define KSEG1_BASE      0xA0000000UL
#define KSEG2_BASE      0xC0000000UL
#define KSEG3_BASE      0xE0000000UL

#define KVM_KSEG0_BASE  0x40000000UL
#define KVM_KSEG2_BASE  0x60000000UL

    if (kvm_enabled()) {
        /* KVM T&E adds guest kernel segments in useg */
        if (real_address >= KVM_KSEG0_BASE) {
            if (real_address < KVM_KSEG2_BASE) {
                /* kseg0 */
                address += KSEG0_BASE - KVM_KSEG0_BASE;
            } else if (real_address <= USEG_LIMIT) {
                /* kseg2/3 */
                address += KSEG2_BASE - KVM_KSEG2_BASE;
            }
        }
    }

    if (address <= USEG_LIMIT) {
        /* useg */
        if (env->CP0_Status & (1 << CP0St_ERL)) {
            *physical = address & 0xFFFFFFFF;
            *prot = PAGE_READ | PAGE_WRITE;
        } else {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        }
#if defined(TARGET_MIPS64)
    } else if (address < 0x4000000000000000ULL) {
        /* xuseg */
        if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        } else {
            ret = TLBRET_BADADDR;
        }
    } else if (address < 0x8000000000000000ULL) {
        /* xsseg */
        if ((supervisor_mode || kernel_mode) &&
            SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        } else {
            ret = TLBRET_BADADDR;
        }
    } else if (address < 0xC000000000000000ULL) {
        /* xkphys */
        if (kernel_mode && KX &&
            (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
            *physical = address & env->PAMask;
            *prot = PAGE_READ | PAGE_WRITE;
        } else {
            ret = TLBRET_BADADDR;
        }
    } else if (address < 0xFFFFFFFF80000000ULL) {
        /* xkseg */
        if (kernel_mode && KX &&
            address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        } else {
            ret = TLBRET_BADADDR;
        }
#endif
    } else if (address < (int32_t)KSEG1_BASE) {
        /* kseg0 */
        if (kernel_mode) {
            *physical = address - (int32_t)KSEG0_BASE;
            *prot = PAGE_READ | PAGE_WRITE;
        } else {
            ret = TLBRET_BADADDR;
        }
    } else if (address < (int32_t)KSEG2_BASE) {
        /* kseg1 */
        if (kernel_mode) {
            *physical = address - (int32_t)KSEG1_BASE;
            *prot = PAGE_READ | PAGE_WRITE;
        } else {
            ret = TLBRET_BADADDR;
        }
    } else if (address < (int32_t)KSEG3_BASE) {
        /* sseg (kseg2) */
        if (supervisor_mode || kernel_mode) {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        } else {
            ret = TLBRET_BADADDR;
        }
    } else {
        /* kseg3 */
        /* XXX: debug segment is not emulated */
        if (kernel_mode) {
            ret = env->tlb->map_address(env, physical, prot, real_address, rw, access_type);
        } else {
            ret = TLBRET_BADADDR;
        }
    }
#if 0
    qemu_log(TARGET_FMT_lx " %d %d => %" HWADDR_PRIx " %d (%d)\n",
            address, rw, access_type, *physical, *prot, ret);
#endif

    return ret;
}
#endif

static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
                                int rw, int tlb_error)
{
    CPUState *cs = CPU(mips_env_get_cpu(env));
    int exception = 0, error_code = 0;

    if (rw == MMU_INST_FETCH) {
        error_code |= EXCP_INST_NOTAVAIL;
    }

    switch (tlb_error) {
    default:
    case TLBRET_BADADDR:
        /* Reference to kernel address from user mode or supervisor mode */
        /* Reference to supervisor address from user mode */
        if (rw == MMU_DATA_STORE) {
            exception = EXCP_AdES;
        } else {
            exception = EXCP_AdEL;
        }
        break;
    case TLBRET_NOMATCH:
        /* No TLB match for a mapped address */
        if (rw == MMU_DATA_STORE) {
            exception = EXCP_TLBS;
        } else {
            exception = EXCP_TLBL;
        }
        error_code |= EXCP_TLB_NOMATCH;
        break;
    case TLBRET_INVALID:
        /* TLB match with no valid bit */
        if (rw == MMU_DATA_STORE) {
            exception = EXCP_TLBS;
        } else {
            exception = EXCP_TLBL;
        }
        break;
    case TLBRET_DIRTY:
        /* TLB match but 'D' bit is cleared */
        exception = EXCP_LTLBL;
        break;
    case TLBRET_XI:
        /* Execute-Inhibit Exception */
        if (env->CP0_PageGrain & (1 << CP0PG_IEC)) {
            exception = EXCP_TLBXI;
        } else {
            exception = EXCP_TLBL;
        }
        break;
    case TLBRET_RI:
        /* Read-Inhibit Exception */
        if (env->CP0_PageGrain & (1 << CP0PG_IEC)) {
            exception = EXCP_TLBRI;
        } else {
            exception = EXCP_TLBL;
        }
        break;
    }
    /* Raise exception */
    env->CP0_BadVAddr = address;
    env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
                       ((address >> 9) & 0x007ffff0);
    env->CP0_EntryHi =
        (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
#if defined(TARGET_MIPS64)
    env->CP0_EntryHi &= env->SEGMask;
    env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
                        ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
                        ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
#endif
    cs->exception_index = exception;
    env->error_code = error_code;
}

#if !defined(CONFIG_USER_ONLY)
hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
    MIPSCPU *cpu = MIPS_CPU(cs);
    hwaddr phys_addr;
    int prot;

    if (get_physical_address(&cpu->env, &phys_addr, &prot, addr, 0,
                             ACCESS_INT) != 0) {
        return -1;
    }
    return phys_addr;
}
#endif

int mips_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
                              int mmu_idx)
{
    MIPSCPU *cpu = MIPS_CPU(cs);
    CPUMIPSState *env = &cpu->env;
#if !defined(CONFIG_USER_ONLY)
    hwaddr physical;
    int prot;
    int access_type;
#endif
    int ret = 0;

#if 0
    log_cpu_state(cs, 0);
#endif
    qemu_log_mask(CPU_LOG_MMU,
              "%s pc " TARGET_FMT_lx " ad %" VADDR_PRIx " rw %d mmu_idx %d\n",
              __func__, env->active_tc.PC, address, rw, mmu_idx);

    /* data access */
#if !defined(CONFIG_USER_ONLY)
    /* XXX: put correct access by using cpu_restore_state()
       correctly */
    access_type = ACCESS_INT;
    ret = get_physical_address(env, &physical, &prot,
                               address, rw, access_type);
    qemu_log_mask(CPU_LOG_MMU,
             "%s address=%" VADDR_PRIx " ret %d physical " TARGET_FMT_plx
             " prot %d\n",
             __func__, address, ret, physical, prot);
    if (ret == TLBRET_MATCH) {
        tlb_set_page(cs, address & TARGET_PAGE_MASK,
                     physical & TARGET_PAGE_MASK, prot | PAGE_EXEC,
                     mmu_idx, TARGET_PAGE_SIZE);
        ret = 0;
    } else if (ret < 0)
#endif
    {
        raise_mmu_exception(env, address, rw, ret);
        ret = 1;
    }

    return ret;
}

#if !defined(CONFIG_USER_ONLY)
hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address, int rw)
{
    hwaddr physical;
    int prot;
    int access_type;
    int ret = 0;

    /* data access */
    access_type = ACCESS_INT;
    ret = get_physical_address(env, &physical, &prot,
                               address, rw, access_type);
    if (ret != TLBRET_MATCH) {
        raise_mmu_exception(env, address, rw, ret);
        return -1LL;
    } else {
        return physical;
    }
}

static const char * const excp_names[EXCP_LAST + 1] = {
    [EXCP_RESET] = "reset",
    [EXCP_SRESET] = "soft reset",
    [EXCP_DSS] = "debug single step",
    [EXCP_DINT] = "debug interrupt",
    [EXCP_NMI] = "non-maskable interrupt",
    [EXCP_MCHECK] = "machine check",
    [EXCP_EXT_INTERRUPT] = "interrupt",
    [EXCP_DFWATCH] = "deferred watchpoint",
    [EXCP_DIB] = "debug instruction breakpoint",
    [EXCP_IWATCH] = "instruction fetch watchpoint",
    [EXCP_AdEL] = "address error load",
    [EXCP_AdES] = "address error store",
    [EXCP_TLBF] = "TLB refill",
    [EXCP_IBE] = "instruction bus error",
    [EXCP_DBp] = "debug breakpoint",
    [EXCP_SYSCALL] = "syscall",
    [EXCP_BREAK] = "break",
    [EXCP_CpU] = "coprocessor unusable",
    [EXCP_RI] = "reserved instruction",
    [EXCP_OVERFLOW] = "arithmetic overflow",
    [EXCP_TRAP] = "trap",
    [EXCP_FPE] = "floating point",
    [EXCP_DDBS] = "debug data break store",
    [EXCP_DWATCH] = "data watchpoint",
    [EXCP_LTLBL] = "TLB modify",
    [EXCP_TLBL] = "TLB load",
    [EXCP_TLBS] = "TLB store",
    [EXCP_DBE] = "data bus error",
    [EXCP_DDBL] = "debug data break load",
    [EXCP_THREAD] = "thread",
    [EXCP_MDMX] = "MDMX",
    [EXCP_C2E] = "precise coprocessor 2",
    [EXCP_CACHE] = "cache error",
    [EXCP_TLBXI] = "TLB execute-inhibit",
    [EXCP_TLBRI] = "TLB read-inhibit",
    [EXCP_MSADIS] = "MSA disabled",
    [EXCP_MSAFPE] = "MSA floating point",
};
#endif

target_ulong exception_resume_pc (CPUMIPSState *env)
{
    target_ulong bad_pc;
    target_ulong isa_mode;

    isa_mode = !!(env->hflags & MIPS_HFLAG_M16);
    bad_pc = env->active_tc.PC | isa_mode;
    if (env->hflags & MIPS_HFLAG_BMASK) {
        /* If the exception was raised from a delay slot, come back to
           the jump.  */
        bad_pc -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4);
    }

    return bad_pc;
}

#if !defined(CONFIG_USER_ONLY)
static void set_hflags_for_handler (CPUMIPSState *env)
{
    /* Exception handlers are entered in 32-bit mode.  */
    env->hflags &= ~(MIPS_HFLAG_M16);
    /* ...except that microMIPS lets you choose.  */
    if (env->insn_flags & ASE_MICROMIPS) {
        env->hflags |= (!!(env->CP0_Config3
                           & (1 << CP0C3_ISA_ON_EXC))
                        << MIPS_HFLAG_M16_SHIFT);
    }
}

static inline void set_badinstr_registers(CPUMIPSState *env)
{
    if (env->hflags & MIPS_HFLAG_M16) {
        /* TODO: add BadInstr support for microMIPS */
        return;
    }
    if (env->CP0_Config3 & (1 << CP0C3_BI)) {
        env->CP0_BadInstr = cpu_ldl_code(env, env->active_tc.PC);
    }
    if ((env->CP0_Config3 & (1 << CP0C3_BP)) &&
        (env->hflags & MIPS_HFLAG_BMASK)) {
        env->CP0_BadInstrP = cpu_ldl_code(env, env->active_tc.PC - 4);
    }
}
#endif

void mips_cpu_do_interrupt(CPUState *cs)
{
#if !defined(CONFIG_USER_ONLY)
    MIPSCPU *cpu = MIPS_CPU(cs);
    CPUMIPSState *env = &cpu->env;
    bool update_badinstr = 0;
    target_ulong offset;
    int cause = -1;
    const char *name;

    if (qemu_log_enabled() && cs->exception_index != EXCP_EXT_INTERRUPT) {
        if (cs->exception_index < 0 || cs->exception_index > EXCP_LAST) {
            name = "unknown";
        } else {
            name = excp_names[cs->exception_index];
        }

        qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
                 __func__, env->active_tc.PC, env->CP0_EPC, name);
    }
    if (cs->exception_index == EXCP_EXT_INTERRUPT &&
        (env->hflags & MIPS_HFLAG_DM)) {
        cs->exception_index = EXCP_DINT;
    }
    offset = 0x180;
    switch (cs->exception_index) {
    case EXCP_DSS:
        env->CP0_Debug |= 1 << CP0DB_DSS;
        /* Debug single step cannot be raised inside a delay slot and
           resume will always occur on the next instruction
           (but we assume the pc has always been updated during
           code translation). */
        env->CP0_DEPC = env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16);
        goto enter_debug_mode;
    case EXCP_DINT:
        env->CP0_Debug |= 1 << CP0DB_DINT;
        goto set_DEPC;
    case EXCP_DIB:
        env->CP0_Debug |= 1 << CP0DB_DIB;
        goto set_DEPC;
    case EXCP_DBp:
        env->CP0_Debug |= 1 << CP0DB_DBp;
        goto set_DEPC;
    case EXCP_DDBS:
        env->CP0_Debug |= 1 << CP0DB_DDBS;
        goto set_DEPC;
    case EXCP_DDBL:
        env->CP0_Debug |= 1 << CP0DB_DDBL;
    set_DEPC:
        env->CP0_DEPC = exception_resume_pc(env);
        env->hflags &= ~MIPS_HFLAG_BMASK;
 enter_debug_mode:
        if (env->insn_flags & ISA_MIPS3) {
            env->hflags |= MIPS_HFLAG_64;
        }
        env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_CP0;
        env->hflags &= ~(MIPS_HFLAG_KSU);
        /* EJTAG probe trap enable is not implemented... */
        if (!(env->CP0_Status & (1 << CP0St_EXL)))
            env->CP0_Cause &= ~(1U << CP0Ca_BD);
        env->active_tc.PC = (int32_t)0xBFC00480;
        set_hflags_for_handler(env);
        break;
    case EXCP_RESET:
        cpu_reset(CPU(cpu));
        break;
    case EXCP_SRESET:
        env->CP0_Status |= (1 << CP0St_SR);
        memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
        goto set_error_EPC;
    case EXCP_NMI:
        env->CP0_Status |= (1 << CP0St_NMI);
 set_error_EPC:
        env->CP0_ErrorEPC = exception_resume_pc(env);
        env->hflags &= ~MIPS_HFLAG_BMASK;
        env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
        if (env->insn_flags & ISA_MIPS3) {
            env->hflags |= MIPS_HFLAG_64;
        }
        env->hflags |= MIPS_HFLAG_CP0;
        env->hflags &= ~(MIPS_HFLAG_KSU);
        if (!(env->CP0_Status & (1 << CP0St_EXL)))
            env->CP0_Cause &= ~(1U << CP0Ca_BD);
        env->active_tc.PC = (int32_t)0xBFC00000;
        set_hflags_for_handler(env);
        break;
    case EXCP_EXT_INTERRUPT:
        cause = 0;
        if (env->CP0_Cause & (1 << CP0Ca_IV)) {
            uint32_t spacing = (env->CP0_IntCtl >> CP0IntCtl_VS) & 0x1f;

            if ((env->CP0_Status & (1 << CP0St_BEV)) || spacing == 0) {
                offset = 0x200;
            } else {
                uint32_t vector = 0;
                uint32_t pending = (env->CP0_Cause & CP0Ca_IP_mask) >> CP0Ca_IP;

                if (env->CP0_Config3 & (1 << CP0C3_VEIC)) {
                    /* For VEIC mode, the external interrupt controller feeds
                     * the vector through the CP0Cause IP lines.  */
                    vector = pending;
                } else {
                    /* Vectored Interrupts
                     * Mask with Status.IM7-IM0 to get enabled interrupts. */
                    pending &= (env->CP0_Status >> CP0St_IM) & 0xff;
                    /* Find the highest-priority interrupt. */
                    while (pending >>= 1) {
                        vector++;
                    }
                }
                offset = 0x200 + (vector * (spacing << 5));
            }
        }
        goto set_EPC;
    case EXCP_LTLBL:
        cause = 1;
        update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
        goto set_EPC;
    case EXCP_TLBL:
        cause = 2;
        update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
        if ((env->error_code & EXCP_TLB_NOMATCH) &&
            !(env->CP0_Status & (1 << CP0St_EXL))) {
#if defined(TARGET_MIPS64)
            int R = env->CP0_BadVAddr >> 62;
            int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
            int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
            int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;

            if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
                (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
                offset = 0x080;
            else
#endif
                offset = 0x000;
        }
        goto set_EPC;
    case EXCP_TLBS:
        cause = 3;
        update_badinstr = 1;
        if ((env->error_code & EXCP_TLB_NOMATCH) &&
            !(env->CP0_Status & (1 << CP0St_EXL))) {
#if defined(TARGET_MIPS64)
            int R = env->CP0_BadVAddr >> 62;
            int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
            int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
            int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;

            if (((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX)) &&
                (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F))))
                offset = 0x080;
            else
#endif
                offset = 0x000;
        }
        goto set_EPC;
    case EXCP_AdEL:
        cause = 4;
        update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
        goto set_EPC;
    case EXCP_AdES:
        cause = 5;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_IBE:
        cause = 6;
        goto set_EPC;
    case EXCP_DBE:
        cause = 7;
        goto set_EPC;
    case EXCP_SYSCALL:
        cause = 8;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_BREAK:
        cause = 9;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_RI:
        cause = 10;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_CpU:
        cause = 11;
        update_badinstr = 1;
        env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
                         (env->error_code << CP0Ca_CE);
        goto set_EPC;
    case EXCP_OVERFLOW:
        cause = 12;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_TRAP:
        cause = 13;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_MSAFPE:
        cause = 14;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_FPE:
        cause = 15;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_C2E:
        cause = 18;
        goto set_EPC;
    case EXCP_TLBRI:
        cause = 19;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_TLBXI:
        cause = 20;
        goto set_EPC;
    case EXCP_MSADIS:
        cause = 21;
        update_badinstr = 1;
        goto set_EPC;
    case EXCP_MDMX:
        cause = 22;
        goto set_EPC;
    case EXCP_DWATCH:
        cause = 23;
        /* XXX: TODO: manage defered watch exceptions */
        goto set_EPC;
    case EXCP_MCHECK:
        cause = 24;
        goto set_EPC;
    case EXCP_THREAD:
        cause = 25;
        goto set_EPC;
    case EXCP_DSPDIS:
        cause = 26;
        goto set_EPC;
    case EXCP_CACHE:
        cause = 30;
        if (env->CP0_Status & (1 << CP0St_BEV)) {
            offset = 0x100;
        } else {
            offset = 0x20000100;
        }
 set_EPC:
        if (!(env->CP0_Status & (1 << CP0St_EXL))) {
            env->CP0_EPC = exception_resume_pc(env);
            if (update_badinstr) {
                set_badinstr_registers(env);
            }
            if (env->hflags & MIPS_HFLAG_BMASK) {
                env->CP0_Cause |= (1U << CP0Ca_BD);
            } else {
                env->CP0_Cause &= ~(1U << CP0Ca_BD);
            }
            env->CP0_Status |= (1 << CP0St_EXL);
            if (env->insn_flags & ISA_MIPS3) {
                env->hflags |= MIPS_HFLAG_64;
            }
            env->hflags |= MIPS_HFLAG_CP0;
            env->hflags &= ~(MIPS_HFLAG_KSU);
        }
        env->hflags &= ~MIPS_HFLAG_BMASK;
        if (env->CP0_Status & (1 << CP0St_BEV)) {
            env->active_tc.PC = (int32_t)0xBFC00200;
        } else {
            env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
        }
        env->active_tc.PC += offset;
        set_hflags_for_handler(env);
        env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
        break;
    default:
        qemu_log("Invalid MIPS exception %d. Exiting\n", cs->exception_index);
        printf("Invalid MIPS exception %d. Exiting\n", cs->exception_index);
        exit(1);
    }
    if (qemu_log_enabled() && cs->exception_index != EXCP_EXT_INTERRUPT) {
        qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
                "    S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
                __func__, env->active_tc.PC, env->CP0_EPC, cause,
                env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
                env->CP0_DEPC);
    }
#endif
    cs->exception_index = EXCP_NONE;
}

bool mips_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
    if (interrupt_request & CPU_INTERRUPT_HARD) {
        MIPSCPU *cpu = MIPS_CPU(cs);
        CPUMIPSState *env = &cpu->env;

        if (cpu_mips_hw_interrupts_pending(env)) {
            /* Raise it */
            cs->exception_index = EXCP_EXT_INTERRUPT;
            env->error_code = 0;
            mips_cpu_do_interrupt(cs);
            return true;
        }
    }
    return false;
}

#if !defined(CONFIG_USER_ONLY)
void r4k_invalidate_tlb (CPUMIPSState *env, int idx, int use_extra)
{
    MIPSCPU *cpu = mips_env_get_cpu(env);
    CPUState *cs;
    r4k_tlb_t *tlb;
    target_ulong addr;
    target_ulong end;
    uint8_t ASID = env->CP0_EntryHi & 0xFF;
    target_ulong mask;

    tlb = &env->tlb->mmu.r4k.tlb[idx];
    /* The qemu TLB is flushed when the ASID changes, so no need to
       flush these entries again.  */
    if (tlb->G == 0 && tlb->ASID != ASID) {
        return;
    }

    if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
        /* For tlbwr, we can shadow the discarded entry into
           a new (fake) TLB entry, as long as the guest can not
           tell that it's there.  */
        env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
        env->tlb->tlb_in_use++;
        return;
    }

    /* 1k pages are not supported. */
    mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
    if (tlb->V0) {
        cs = CPU(cpu);
        addr = tlb->VPN & ~mask;
#if defined(TARGET_MIPS64)
        if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
            addr |= 0x3FFFFF0000000000ULL;
        }
#endif
        end = addr | (mask >> 1);
        while (addr < end) {
            tlb_flush_page(cs, addr);
            addr += TARGET_PAGE_SIZE;
        }
    }
    if (tlb->V1) {
        cs = CPU(cpu);
        addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
#if defined(TARGET_MIPS64)
        if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
            addr |= 0x3FFFFF0000000000ULL;
        }
#endif
        end = addr | mask;
        while (addr - 1 < end) {
            tlb_flush_page(cs, addr);
            addr += TARGET_PAGE_SIZE;
        }
    }
}
#endif