forked from michaekang/android_s2e
-
Notifications
You must be signed in to change notification settings - Fork 4
/
cpu-exec.c
1430 lines (1302 loc) · 48.1 KB
/
cpu-exec.c
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
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* i386 emulator main execution loop
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* 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 "config.h"
#include "exec.h"
#include "disas.h"
#include "tcg.h"
#include "kvm.h"
#include "qemu-barrier.h"
#ifdef CONFIG_S2E
#include "s2e/s2e_qemu.h"
#endif
#if !defined(CONFIG_SOFTMMU)
#undef EAX
#undef ECX
#undef EDX
#undef EBX
#undef ESP
#undef EBP
#undef ESI
#undef EDI
#undef EIP
#include <signal.h>
#ifdef __linux__
#include <sys/ucontext.h>
#endif
#endif
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
// Work around ugly bugs in glibc that mangle global register contents
#undef env
#define env cpu_single_env
#endif
#ifdef CONFIG_S2E
#ifdef TARGET_I386
#define do_interrupt(intno, is_int, error_code, next_eip, is_hw) \
s2e_do_interrupt(g_s2e, g_s2e_state, intno, is_int, error_code, next_eip, is_hw)
#endif
#ifdef TARGET_ARM
#define do_interrupt(env) \
s2e_do_interrupt(g_s2e,g_s2e_state)
#endif
#endif
int tb_invalidated_flag;
//#define CONFIG_DEBUG_EXEC
//#define DEBUG_SIGNAL
int qemu_cpu_has_work(CPUState *env)
{
return cpu_has_work(env);
}
void cpu_loop_exit(void)
{
env->current_tb = NULL;
longjmp(env->jmp_env, 1);
}
/* exit the current TB from a signal handler. The host registers are
restored in a state compatible with the CPU emulator
*/
void cpu_resume_from_signal(CPUState *env1, void *puc)
{
#if !defined(CONFIG_SOFTMMU)
#ifdef __linux__
struct ucontext *uc = puc;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
#endif
#endif
env = env1;
/* XXX: restore cpu registers saved in host registers */
#if !defined(CONFIG_SOFTMMU)
if (puc) {
/* XXX: use siglongjmp ? */
#ifdef __linux__
#ifdef __ia64
sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
#else
sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
#endif
#elif defined(__OpenBSD__)
sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
#endif
}
#endif
env->exception_index = -1;
longjmp(env->jmp_env, 1);
}
/* Execute the code without caching the generated code. An interpreter
could be used if available. */
static void cpu_exec_nocache(int max_cycles, TranslationBlock *orig_tb)
{
unsigned long next_tb;
TranslationBlock *tb;
/* Should never happen.
We only end up here when an existing TB is too long. */
if (max_cycles > CF_COUNT_MASK)
max_cycles = CF_COUNT_MASK;
tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
max_cycles);
env->current_tb = tb;
/* execute the generated code */
#ifdef CONFIG_S2E
env->s2e_current_tb = tb;
next_tb = s2e_qemu_tb_exec(g_s2e, g_s2e_state, tb);
env->s2e_current_tb = NULL;
#else
next_tb = tcg_qemu_tb_exec(tb->tc_ptr);
#endif
env->current_tb = NULL;
if ((next_tb & 3) == 2) {
/* Restore PC. This may happen if async event occurs before
the TB starts executing. */
cpu_pc_from_tb(env, tb);
}
tb_phys_invalidate(tb, -1);
tb_free(tb);
}
static TranslationBlock *tb_find_slow(target_ulong pc,
target_ulong cs_base,
uint64_t flags)
{
TranslationBlock *tb, **ptb1;
unsigned int h;
target_ulong phys_pc, phys_page1, phys_page2, virt_page2;
tb_invalidated_flag = 0;
/* find translated block using physical mappings */
phys_pc = get_phys_addr_code(env, pc);
phys_page1 = phys_pc & TARGET_PAGE_MASK;
phys_page2 = -1;
h = tb_phys_hash_func(phys_pc);
ptb1 = &tb_phys_hash[h];
for(;;) {
tb = *ptb1;
if (!tb)
goto not_found;
if (tb->pc == pc &&
tb->page_addr[0] == phys_page1 &&
tb->cs_base == cs_base &&
tb->flags == flags) {
/* check next page if needed */
if (tb->page_addr[1] != -1) {
virt_page2 = (pc & TARGET_PAGE_MASK) +
TARGET_PAGE_SIZE;
phys_page2 = get_phys_addr_code(env, virt_page2);
if (tb->page_addr[1] == phys_page2)
goto found;
} else {
goto found;
}
}
ptb1 = &tb->phys_hash_next;
}
not_found:
/* if no translated code available, then translate it now */
tb = tb_gen_code(env, pc, cs_base, flags, 0);
found:
/* Move the last found TB to the head of the list */
if (likely(*ptb1)) {
*ptb1 = tb->phys_hash_next;
tb->phys_hash_next = tb_phys_hash[h];
tb_phys_hash[h] = tb;
}
/* we add the TB in the virtual pc hash table */
env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
return tb;
}
static inline TranslationBlock *tb_find_fast(void)
{
TranslationBlock *tb;
target_ulong cs_base, pc;
int flags;
/* we record a subset of the CPU state. It will
always be the same before a given translated block
is executed. */
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
tb->flags != flags)) {
tb = tb_find_slow(pc, cs_base, flags);
}
return tb;
}
static CPUDebugExcpHandler *debug_excp_handler;
CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
{
CPUDebugExcpHandler *old_handler = debug_excp_handler;
debug_excp_handler = handler;
return old_handler;
}
static void cpu_handle_debug_exception(CPUState *env)
{
CPUWatchpoint *wp;
if (!env->watchpoint_hit) {
QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
wp->flags &= ~BP_WATCHPOINT_HIT;
}
}
if (debug_excp_handler) {
debug_excp_handler(env);
}
}
/* main execution loop */
volatile sig_atomic_t exit_request;
#ifndef CONFIG_S2E
const char* diff_log_filename = "./plain_insn.log";
#else
const char* diff_log_filename = "./s2e_insn.log";
#endif
FILE* diff_log_fd = NULL;
unsigned long block_icount = 0;
unsigned long diff_num = 10000;
unsigned long diff_start = 1000000;
unsigned long diff_end = 2000000;
int log_enabled = 0;
void diff_block(CPUState* env){
block_icount++;
if(diff_log_fd != NULL){
#if 0
if(block_icount > diff_start && block_icount <= diff_end){
fprintf(diff_log_fd, "block_icount=%d, pc=0x%x\n", block_icount, env->regs[15]);
int i = 0;
for(; i < 15; i++)
fprintf(diff_log_fd, "r[%d]=0x%x\t", i, env->regs[i]);
fprintf(diff_log_fd, "\n----------\n");
fflush(diff_log_fd);
}
if(env->regs[15] < 0xc0000000 && (block_icount > 0)){
diff_num --;
fprintf(diff_log_fd, "block_icount=%d, pc=0x%x\n", block_icount, env->regs[15]);
int i = 0;
for(; i < 15; i++)
fprintf(diff_log_fd, "r[%d]=0x%x\t", i, env->regs[i]);
fprintf(diff_log_fd, "\n----------\n");
fflush(diff_log_fd);
}
#endif
}
static unsigned long trigger_pc = 0x16104;
if(env->regs[15] == trigger_pc)
log_enabled = 0;
if(log_enabled){
printf("block_icount=%d, pc=0x%x\n", block_icount, env->regs[15]);
if(--diff_num == 0)
log_enabled = 0;
}
}
int cpu_exec(CPUState *env1)
{
//#ifdef CONFIG_S2E
volatile host_reg_t saved_env_reg;
//#endif
int ret, interrupt_request;
TranslationBlock *tb;
uint8_t *tc_ptr;
unsigned long next_tb;
unsigned intNb=-1;
if(diff_log_fd == NULL){
diff_log_fd = fopen(diff_log_filename, "w+");
if(diff_log_fd == NULL){
fprintf(stderr, "can not open log file %s\n", diff_log_filename);
exit(-1);
}
}
if (env1->halted) {
if (!cpu_has_work(env1)) {
return EXCP_HALTED;
}
env1->halted = 0;
}
cpu_single_env = env1;
/* the access to env below is actually saving the global register's
value, so that files not including target-xyz/exec.h are free to
use it. */
QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
saved_env_reg = (host_reg_t) env;
barrier();
env = env1;
if (unlikely(exit_request)) {
env->exit_request = 1;
}
#if defined(TARGET_I386)
if (!kvm_enabled()) {
/* put eflags in CPU temporary format */
CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
DF = 1 - (2 * ((env->eflags >> 10) & 1));
CC_OP = CC_OP_EFLAGS;
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
}
#elif defined(TARGET_SPARC)
#elif defined(TARGET_M68K)
env->cc_op = CC_OP_FLAGS;
env->cc_dest = env->sr & 0xf;
env->cc_x = (env->sr >> 4) & 1;
#elif defined(TARGET_ALPHA)
#elif defined(TARGET_ARM)
#elif defined(TARGET_UNICORE32)
#elif defined(TARGET_PPC)
#elif defined(TARGET_LM32)
#elif defined(TARGET_MICROBLAZE)
#elif defined(TARGET_MIPS)
#elif defined(TARGET_SH4)
#elif defined(TARGET_CRIS)
#elif defined(TARGET_S390X)
/* XXXXX */
#else
#error unsupported target CPU
#endif
env->exception_index = -1;
/* prepare setjmp context for exception handling */
for(;;) {
//if (setjmp(env->jmp_env) == 0) {
if (s2e_setjmp(env->jmp_env) == 0) {
#ifdef CONFIG_S2E
g_s2e_state = s2e_select_next_state(g_s2e, g_s2e_state);
s2e_qemu_finalize_tb_exec(g_s2e, g_s2e_state);
#endif
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
/* if an exception is pending, we execute it here */
if (env->exception_index >= 0) {
if (env->exception_index >= EXCP_INTERRUPT) {
/* exit request from the cpu execution loop */
ret = env->exception_index;
if (ret == EXCP_DEBUG) {
cpu_handle_debug_exception(env);
}
break;
} else {
#if defined(CONFIG_USER_ONLY)
/* if user mode only, we simulate a fake exception
which will be handled outside the cpu execution
loop */
#if defined(TARGET_I386)
do_interrupt_user(env->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip);
/* successfully delivered */
env->old_exception = -1;
#endif
ret = env->exception_index;
break;
#else
#if defined(TARGET_I386)
/* simulate a real cpu exception. On i386, it can
trigger new exceptions, but we do not handle
double or triple faults yet. */
do_interrupt(env->exception_index,
env->exception_is_int,
env->error_code,
env->exception_next_eip, 0);
/* successfully delivered */
env->old_exception = -1;
#elif defined(TARGET_PPC)
do_interrupt(env);
#elif defined(TARGET_LM32)
do_interrupt(env);
#elif defined(TARGET_MICROBLAZE)
do_interrupt(env);
#elif defined(TARGET_MIPS)
do_interrupt(env);
#elif defined(TARGET_SPARC)
do_interrupt(env);
#elif defined(TARGET_ARM)
do_interrupt(env);
#elif defined(TARGET_UNICORE32)
do_interrupt(env);
#elif defined(TARGET_SH4)
do_interrupt(env);
#elif defined(TARGET_ALPHA)
do_interrupt(env);
#elif defined(TARGET_CRIS)
do_interrupt(env);
#elif defined(TARGET_M68K)
do_interrupt(0);
#elif defined(TARGET_S390X)
do_interrupt(env);
#endif
env->exception_index = -1;
#endif
}
}
if (kvm_enabled()) {
kvm_cpu_exec(env);
longjmp(env->jmp_env, 1);
}
next_tb = 0; /* force lookup of first TB */
for(;;) {
interrupt_request = env->interrupt_request;
if (unlikely(interrupt_request)) {
if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
/* Mask out external interrupts for this step. */
interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
}
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
env->exception_index = EXCP_DEBUG;
cpu_loop_exit();
}
#if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
defined(TARGET_MICROBLAZE) || defined(TARGET_LM32) || defined(TARGET_UNICORE32)
if (interrupt_request & CPU_INTERRUPT_HALT) {
env->interrupt_request &= ~CPU_INTERRUPT_HALT;
env->halted = 1;
env->exception_index = EXCP_HLT;
cpu_loop_exit();
}
#endif
#if defined(TARGET_I386)
if (interrupt_request & CPU_INTERRUPT_INIT) {
svm_check_intercept(SVM_EXIT_INIT);
do_cpu_init(env);
env->exception_index = EXCP_HALTED;
cpu_loop_exit();
} else if (interrupt_request & CPU_INTERRUPT_SIPI) {
do_cpu_sipi(env);
} else if (env->hflags2 & HF2_GIF_MASK) {
if ((interrupt_request & CPU_INTERRUPT_SMI) &&
!(env->hflags & HF_SMM_MASK)) {
svm_check_intercept(SVM_EXIT_SMI);
env->interrupt_request &= ~CPU_INTERRUPT_SMI;
do_smm_enter();
next_tb = 0;
} else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
!(env->hflags2 & HF2_NMI_MASK)) {
env->interrupt_request &= ~CPU_INTERRUPT_NMI;
env->hflags2 |= HF2_NMI_MASK;
do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
next_tb = 0;
} else if (interrupt_request & CPU_INTERRUPT_MCE) {
env->interrupt_request &= ~CPU_INTERRUPT_MCE;
do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
next_tb = 0;
} else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
(((env->hflags2 & HF2_VINTR_MASK) &&
(env->hflags2 & HF2_HIF_MASK)) ||
(!(env->hflags2 & HF2_VINTR_MASK) &&
(env->eflags & IF_MASK &&
!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
int intno;
svm_check_intercept(SVM_EXIT_INTR);
env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
intno = cpu_get_pic_interrupt(env);
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
do_interrupt(intno, 0, 0, 0, 1);
/* ensure that no TB jump will be modified as
the program flow was changed */
next_tb = 0;
#if !defined(CONFIG_USER_ONLY)
} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
(env->eflags & IF_MASK) &&
!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
int intno;
/* FIXME: this should respect TPR */
svm_check_intercept(SVM_EXIT_VINTR);
intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
do_interrupt(intno, 0, 0, 0, 1);
env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
next_tb = 0;
#endif
}
}
#elif defined(TARGET_PPC)
#if 0
if ((interrupt_request & CPU_INTERRUPT_RESET)) {
cpu_reset(env);
}
#endif
if (interrupt_request & CPU_INTERRUPT_HARD) {
ppc_hw_interrupt(env);
if (env->pending_interrupts == 0)
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
next_tb = 0;
}
#elif defined(TARGET_LM32)
if ((interrupt_request & CPU_INTERRUPT_HARD)
&& (env->ie & IE_IE)) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_MICROBLAZE)
if ((interrupt_request & CPU_INTERRUPT_HARD)
&& (env->sregs[SR_MSR] & MSR_IE)
&& !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
&& !(env->iflags & (D_FLAG | IMM_FLAG))) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_MIPS)
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
cpu_mips_hw_interrupts_pending(env)) {
/* Raise it */
env->exception_index = EXCP_EXT_INTERRUPT;
env->error_code = 0;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_SPARC)
if (interrupt_request & CPU_INTERRUPT_HARD) {
if (cpu_interrupts_enabled(env) &&
env->interrupt_index > 0) {
int pil = env->interrupt_index & 0xf;
int type = env->interrupt_index & 0xf0;
if (((type == TT_EXTINT) &&
cpu_pil_allowed(env, pil)) ||
type != TT_EXTINT) {
env->exception_index = env->interrupt_index;
do_interrupt(env);
next_tb = 0;
}
}
}
#elif defined(TARGET_ARM)
if (interrupt_request & CPU_INTERRUPT_FIQ
&& !(env->uncached_cpsr & CPSR_F)) {
env->exception_index = EXCP_FIQ;
do_interrupt(env);
next_tb = 0;
}
/* ARMv7-M interrupt return works by loading a magic value
into the PC. On real hardware the load causes the
return to occur. The qemu implementation performs the
jump normally, then does the exception return when the
CPU tries to execute code at the magic address.
This will cause the magic PC value to be pushed to
the stack if an interrupt occurred at the wrong time.
We avoid this by disabling interrupts when
pc contains a magic address. */
if (interrupt_request & CPU_INTERRUPT_HARD
&& ((IS_M(env) && env->regs[15] < 0xfffffff0)
|| !(env->uncached_cpsr & CPSR_I))) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_UNICORE32)
if (interrupt_request & CPU_INTERRUPT_HARD
&& !(env->uncached_asr & ASR_I)) {
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_SH4)
if (interrupt_request & CPU_INTERRUPT_HARD) {
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_ALPHA)
if (interrupt_request & CPU_INTERRUPT_HARD) {
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_CRIS)
if (interrupt_request & CPU_INTERRUPT_HARD
&& (env->pregs[PR_CCS] & I_FLAG)
&& !env->locked_irq) {
env->exception_index = EXCP_IRQ;
do_interrupt(env);
next_tb = 0;
}
if (interrupt_request & CPU_INTERRUPT_NMI
&& (env->pregs[PR_CCS] & M_FLAG)) {
env->exception_index = EXCP_NMI;
do_interrupt(env);
next_tb = 0;
}
#elif defined(TARGET_M68K)
if (interrupt_request & CPU_INTERRUPT_HARD
&& ((env->sr & SR_I) >> SR_I_SHIFT)
< env->pending_level) {
/* Real hardware gets the interrupt vector via an
IACK cycle at this point. Current emulated
hardware doesn't rely on this, so we
provide/save the vector when the interrupt is
first signalled. */
env->exception_index = env->pending_vector;
do_interrupt(1);
next_tb = 0;
}
#elif defined(TARGET_S390X) && !defined(CONFIG_USER_ONLY)
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
(env->psw.mask & PSW_MASK_EXT)) {
do_interrupt(env);
next_tb = 0;
}
#endif
/* Don't use the cached interrupt_request value,
do_interrupt may have updated the EXITTB flag. */
if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
/* ensure that no TB jump will be modified as
the program flow was changed */
next_tb = 0;
}
}
if (unlikely(env->exit_request)) {
env->exit_request = 0;
env->exception_index = EXCP_INTERRUPT;
cpu_loop_exit();
}
#if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
/* restore flags in standard format */
#if defined(TARGET_I386)
env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
log_cpu_state(env, X86_DUMP_CCOP);
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
#elif defined(TARGET_M68K)
cpu_m68k_flush_flags(env, env->cc_op);
env->cc_op = CC_OP_FLAGS;
env->sr = (env->sr & 0xffe0)
| env->cc_dest | (env->cc_x << 4);
log_cpu_state(env, 0);
#else
log_cpu_state(env, 0);
#endif
}
#endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
spin_lock(&tb_lock);
if (intNb != -1) {
qemu_log_mask(CPU_LOG_INT,
"CPU interrupt, vector=0x%x\n", intNb);
#ifdef CONFIG_S2E
s2e_on_exception(intNb);
#endif
intNb = -1;
}
tb = tb_find_fast();
/* Note: we do it here to avoid a gcc bug on Mac OS X when
doing it in tb_find_slow */
if (tb_invalidated_flag) {
/* as some TB could have been invalidated because
of memory exceptions while generating the code, we
must recompute the hash index here */
next_tb = 0;
tb_invalidated_flag = 0;
}
#ifdef CONFIG_DEBUG_EXEC
qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
(long)tb->tc_ptr, tb->pc,
lookup_symbol(tb->pc));
#endif
/* see if we can patch the calling TB. When the TB
spans two pages, we cannot safely do a direct
jump. */
if (next_tb != 0 && tb->page_addr[1] == -1) {
tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
}
spin_unlock(&tb_lock);
/* cpu_interrupt might be called while translating the
TB, but before it is linked into a potentially
infinite loop and becomes env->current_tb. Avoid
starting execution if there is a pending interrupt. */
env->current_tb = tb;
barrier();
if (likely(!env->exit_request)) {
tc_ptr = tb->tc_ptr;
/* execute the generated code */
#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
#undef env
env = cpu_single_env;
#define env cpu_single_env
#endif
#if defined(CONFIG_S2E)
env->s2e_current_tb = tb;
next_tb = s2e_qemu_tb_exec(g_s2e, g_s2e_state, tb);
env->s2e_current_tb = NULL;
#elif defined(CONFIG_LLVM)
if(execute_llvm) {
#define SAVE_HOST_REGS 1
#include "hostregs_helper.h"
next_tb = tcg_llvm_qemu_tb_exec(tb, saved_AREGs);
// restore host regs
#include "hostregs_helper.h"
} else {
next_tb = tcg_qemu_tb_exec(tc_ptr);
}
#else
next_tb = tcg_qemu_tb_exec(tc_ptr);
#endif
diff_block(env);
if ((next_tb & 3) == 2) {
/* Instruction counter expired. */
int insns_left;
tb = (TranslationBlock *)(long)(next_tb & ~3);
/* Restore PC. */
cpu_pc_from_tb(env, tb);
insns_left = env->icount_decr.u32;
if (env->icount_extra && insns_left >= 0) {
/* Refill decrementer and continue execution. */
env->icount_extra += insns_left;
if (env->icount_extra > 0xffff) {
insns_left = 0xffff;
} else {
insns_left = env->icount_extra;
}
env->icount_extra -= insns_left;
env->icount_decr.u16.low = insns_left;
} else {
if (insns_left > 0) {
/* Execute remaining instructions. */
cpu_exec_nocache(insns_left, tb);
}
env->exception_index = EXCP_INTERRUPT;
next_tb = 0;
cpu_loop_exit();
}
}
}
env->current_tb = NULL;
/* reset soft MMU for next block (it can currently
only be set by a memory fault) */
} /* for(;;) */
}else{
#ifdef CONFIG_S2E
cpu_restore_icount(env);
s2e_qemu_cleanup_tb_exec(g_s2e, g_s2e_state, NULL);
#endif
env_to_regs();
}
} /* for(;;) */
#if defined(TARGET_I386)
#ifdef CONFIG_S2E
s2e_set_cc_op_eflags(g_s2e, g_s2e_state);
#else
/* restore flags in standard format */
env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
#endif
#elif defined(TARGET_ARM)
/* XXX: Save/restore host fpu exception state?. */
#elif defined(TARGET_UNICORE32)
#elif defined(TARGET_SPARC)
#elif defined(TARGET_PPC)
#elif defined(TARGET_LM32)
#elif defined(TARGET_M68K)
cpu_m68k_flush_flags(env, env->cc_op);
env->cc_op = CC_OP_FLAGS;
env->sr = (env->sr & 0xffe0)
| env->cc_dest | (env->cc_x << 4);
#elif defined(TARGET_MICROBLAZE)
#elif defined(TARGET_MIPS)
#elif defined(TARGET_SH4)
#elif defined(TARGET_ALPHA)
#elif defined(TARGET_CRIS)
#elif defined(TARGET_S390X)
/* XXXXX */
#else
#error unsupported target CPU
#endif
/* restore global registers */
barrier();
env = (void *) saved_env_reg;
/* fail safe : never use cpu_single_env outside cpu_exec() */
cpu_single_env = NULL;
return ret;
}
/* must only be called from the generated code as an exception can be
generated */
void tb_invalidate_page_range(target_ulong start, target_ulong end)
{
/* XXX: cannot enable it yet because it yields to MMU exception
where NIP != read address on PowerPC */
#if 0
target_ulong phys_addr;
phys_addr = get_phys_addr_code(env, start);
tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
#endif
}
#if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
selector &= 0xffff;
cpu_x86_load_seg_cache(env, seg_reg, selector,
(selector << 4), 0xffff, 0);
} else {
helper_load_seg(seg_reg, selector);
}
env = saved_env;
}
void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
helper_fsave(ptr, data32);
env = saved_env;
}
void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
helper_frstor(ptr, data32);
env = saved_env;
}
#endif /* TARGET_I386 */
#if !defined(CONFIG_SOFTMMU)
#if defined(TARGET_I386)
#define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
#else
#define EXCEPTION_ACTION cpu_loop_exit()
#endif
/* 'pc' is the host PC at which the exception was raised. 'address' is
the effective address of the memory exception. 'is_write' is 1 if a
write caused the exception and otherwise 0'. 'old_set' is the
signal set which should be restored */
static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
int is_write, sigset_t *old_set,
void *puc)
{
TranslationBlock *tb;
int ret;
if (cpu_single_env)
env = cpu_single_env; /* XXX: find a correct solution for multithread */
#if defined(DEBUG_SIGNAL)
qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
pc, address, is_write, *(unsigned long *)old_set);
#endif
/* XXX: locking issue */
if (is_write && page_unprotect(h2g(address), pc, puc)) {
return 1;
}
/* see if it is an MMU fault */
printf("In %s, before cpu_handle_mmu_fault, address=0x%x, is_write=%d\n", __FUNCTION__, address, is_write);
ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
if (ret < 0)
return 0; /* not an MMU fault */
if (ret == 0)
return 1; /* the MMU fault was handled without causing real CPU fault */
/* now we have a real cpu fault */
tb = tb_find_pc(pc);
#ifdef CONFIG_S2E
cpu_restore_icount(env);
#endif
if (tb) {
/* the PC is inside the translated code. It means that we have
a virtual CPU fault */
cpu_restore_state(tb, env, pc);
}
/* we restore the process signal mask as the sigreturn should
do it (XXX: use sigsetjmp) */
sigprocmask(SIG_SETMASK, old_set, NULL);
EXCEPTION_ACTION;
/* never comes here */
return 1;
}
#if defined(__i386__)
#if defined(__APPLE__)
# include <sys/ucontext.h>
# define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
# define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
# define ERROR_sig(context) ((context)->uc_mcontext->es.err)
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined (__NetBSD__)
# include <ucontext.h>
# define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
# define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
# define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined (__FreeBSD__) || defined(__DragonFly__)
# include <ucontext.h>
# define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_eip))
# define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
# define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
# define MASK_sig(context) ((context)->uc_sigmask)
#elif defined(__OpenBSD__)
# define EIP_sig(context) ((context)->sc_eip)
# define TRAP_sig(context) ((context)->sc_trapno)
# define ERROR_sig(context) ((context)->sc_err)
# define MASK_sig(context) ((context)->sc_mask)
#else
# define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
# define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
# define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
# define MASK_sig(context) ((context)->uc_sigmask)
#endif
int cpu_signal_handler(int host_signum, void *pinfo,
void *puc)
{
siginfo_t *info = pinfo;
#if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
ucontext_t *uc = puc;
#elif defined(__OpenBSD__)
struct sigcontext *uc = puc;
#else
struct ucontext *uc = puc;
#endif
unsigned long pc;
int trapno;