/
translate.c
11657 lines (11137 loc) · 407 KB
/
translate.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
/*
* ARM translation
*
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2005-2007 CodeSourcery
* Copyright (c) 2007 OpenedHand, Ltd.
*
* 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 "cpu.h"
#include "internals.h"
#include "disas/disas.h"
#include "tcg-op.h"
#include "qemu/log.h"
#include "qemu/bitops.h"
#include "arm_ldst.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
#include "trace-tcg.h"
#define ENABLE_ARCH_4T arm_dc_feature(s, ARM_FEATURE_V4T)
#define ENABLE_ARCH_5 arm_dc_feature(s, ARM_FEATURE_V5)
/* currently all emulated v5 cores are also v5TE, so don't bother */
#define ENABLE_ARCH_5TE arm_dc_feature(s, ARM_FEATURE_V5)
#define ENABLE_ARCH_5J 0
#define ENABLE_ARCH_6 arm_dc_feature(s, ARM_FEATURE_V6)
#define ENABLE_ARCH_6K arm_dc_feature(s, ARM_FEATURE_V6K)
#define ENABLE_ARCH_6T2 arm_dc_feature(s, ARM_FEATURE_THUMB2)
#define ENABLE_ARCH_7 arm_dc_feature(s, ARM_FEATURE_V7)
#define ENABLE_ARCH_8 arm_dc_feature(s, ARM_FEATURE_V8)
#define ARCH(x) do { if (!ENABLE_ARCH_##x) goto illegal_op; } while(0)
#include "translate.h"
#if defined(CONFIG_USER_ONLY)
#define IS_USER(s) 1
#else
#define IS_USER(s) (s->user)
#endif
TCGv_ptr cpu_env;
/* We reuse the same 64-bit temporaries for efficiency. */
static TCGv_i64 cpu_V0, cpu_V1, cpu_M0;
static TCGv_i32 cpu_R[16];
TCGv_i32 cpu_CF, cpu_NF, cpu_VF, cpu_ZF;
TCGv_i64 cpu_exclusive_addr;
TCGv_i64 cpu_exclusive_val;
#ifdef CONFIG_USER_ONLY
TCGv_i64 cpu_exclusive_test;
TCGv_i32 cpu_exclusive_info;
#endif
/* FIXME: These should be removed. */
static TCGv_i32 cpu_F0s, cpu_F1s;
static TCGv_i64 cpu_F0d, cpu_F1d;
#include "exec/gen-icount.h"
static const char *regnames[] =
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "pc" };
/* initialize TCG globals. */
void arm_translate_init(void)
{
int i;
cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
for (i = 0; i < 16; i++) {
cpu_R[i] = tcg_global_mem_new_i32(TCG_AREG0,
offsetof(CPUARMState, regs[i]),
regnames[i]);
}
cpu_CF = tcg_global_mem_new_i32(TCG_AREG0, offsetof(CPUARMState, CF), "CF");
cpu_NF = tcg_global_mem_new_i32(TCG_AREG0, offsetof(CPUARMState, NF), "NF");
cpu_VF = tcg_global_mem_new_i32(TCG_AREG0, offsetof(CPUARMState, VF), "VF");
cpu_ZF = tcg_global_mem_new_i32(TCG_AREG0, offsetof(CPUARMState, ZF), "ZF");
cpu_exclusive_addr = tcg_global_mem_new_i64(TCG_AREG0,
offsetof(CPUARMState, exclusive_addr), "exclusive_addr");
cpu_exclusive_val = tcg_global_mem_new_i64(TCG_AREG0,
offsetof(CPUARMState, exclusive_val), "exclusive_val");
#ifdef CONFIG_USER_ONLY
cpu_exclusive_test = tcg_global_mem_new_i64(TCG_AREG0,
offsetof(CPUARMState, exclusive_test), "exclusive_test");
cpu_exclusive_info = tcg_global_mem_new_i32(TCG_AREG0,
offsetof(CPUARMState, exclusive_info), "exclusive_info");
#endif
a64_translate_init();
}
static inline ARMMMUIdx get_a32_user_mem_index(DisasContext *s)
{
/* Return the mmu_idx to use for A32/T32 "unprivileged load/store"
* insns:
* if PL2, UNPREDICTABLE (we choose to implement as if PL0)
* otherwise, access as if at PL0.
*/
switch (s->mmu_idx) {
case ARMMMUIdx_S1E2: /* this one is UNPREDICTABLE */
case ARMMMUIdx_S12NSE0:
case ARMMMUIdx_S12NSE1:
return ARMMMUIdx_S12NSE0;
case ARMMMUIdx_S1E3:
case ARMMMUIdx_S1SE0:
case ARMMMUIdx_S1SE1:
return ARMMMUIdx_S1SE0;
case ARMMMUIdx_S2NS:
default:
g_assert_not_reached();
}
}
static inline TCGv_i32 load_cpu_offset(int offset)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_ld_i32(tmp, cpu_env, offset);
return tmp;
}
#define load_cpu_field(name) load_cpu_offset(offsetof(CPUARMState, name))
static inline void store_cpu_offset(TCGv_i32 var, int offset)
{
tcg_gen_st_i32(var, cpu_env, offset);
tcg_temp_free_i32(var);
}
#define store_cpu_field(var, name) \
store_cpu_offset(var, offsetof(CPUARMState, name))
/* Set a variable to the value of a CPU register. */
static void load_reg_var(DisasContext *s, TCGv_i32 var, int reg)
{
if (reg == 15) {
uint32_t addr;
/* normally, since we updated PC, we need only to add one insn */
if (s->thumb)
addr = (long)s->pc + 2;
else
addr = (long)s->pc + 4;
tcg_gen_movi_i32(var, addr);
} else {
tcg_gen_mov_i32(var, cpu_R[reg]);
}
}
/* Create a new temporary and set it to the value of a CPU register. */
static inline TCGv_i32 load_reg(DisasContext *s, int reg)
{
TCGv_i32 tmp = tcg_temp_new_i32();
load_reg_var(s, tmp, reg);
return tmp;
}
/* Set a CPU register. The source must be a temporary and will be
marked as dead. */
static void store_reg(DisasContext *s, int reg, TCGv_i32 var)
{
if (reg == 15) {
tcg_gen_andi_i32(var, var, ~1);
s->is_jmp = DISAS_JUMP;
}
tcg_gen_mov_i32(cpu_R[reg], var);
tcg_temp_free_i32(var);
}
/* Value extensions. */
#define gen_uxtb(var) tcg_gen_ext8u_i32(var, var)
#define gen_uxth(var) tcg_gen_ext16u_i32(var, var)
#define gen_sxtb(var) tcg_gen_ext8s_i32(var, var)
#define gen_sxth(var) tcg_gen_ext16s_i32(var, var)
#define gen_sxtb16(var) gen_helper_sxtb16(var, var)
#define gen_uxtb16(var) gen_helper_uxtb16(var, var)
static inline void gen_set_cpsr(TCGv_i32 var, uint32_t mask)
{
TCGv_i32 tmp_mask = tcg_const_i32(mask);
gen_helper_cpsr_write(cpu_env, var, tmp_mask);
tcg_temp_free_i32(tmp_mask);
}
/* Set NZCV flags from the high 4 bits of var. */
#define gen_set_nzcv(var) gen_set_cpsr(var, CPSR_NZCV)
static void gen_exception_internal(int excp)
{
TCGv_i32 tcg_excp = tcg_const_i32(excp);
assert(excp_is_internal(excp));
gen_helper_exception_internal(cpu_env, tcg_excp);
tcg_temp_free_i32(tcg_excp);
}
static void gen_exception(int excp, uint32_t syndrome, uint32_t target_el)
{
TCGv_i32 tcg_excp = tcg_const_i32(excp);
TCGv_i32 tcg_syn = tcg_const_i32(syndrome);
TCGv_i32 tcg_el = tcg_const_i32(target_el);
gen_helper_exception_with_syndrome(cpu_env, tcg_excp,
tcg_syn, tcg_el);
tcg_temp_free_i32(tcg_el);
tcg_temp_free_i32(tcg_syn);
tcg_temp_free_i32(tcg_excp);
}
static void gen_ss_advance(DisasContext *s)
{
/* If the singlestep state is Active-not-pending, advance to
* Active-pending.
*/
if (s->ss_active) {
s->pstate_ss = 0;
gen_helper_clear_pstate_ss(cpu_env);
}
}
static void gen_step_complete_exception(DisasContext *s)
{
/* We just completed step of an insn. Move from Active-not-pending
* to Active-pending, and then also take the swstep exception.
* This corresponds to making the (IMPDEF) choice to prioritize
* swstep exceptions over asynchronous exceptions taken to an exception
* level where debug is disabled. This choice has the advantage that
* we do not need to maintain internal state corresponding to the
* ISV/EX syndrome bits between completion of the step and generation
* of the exception, and our syndrome information is always correct.
*/
gen_ss_advance(s);
gen_exception(EXCP_UDEF, syn_swstep(s->ss_same_el, 1, s->is_ldex),
default_exception_el(s));
s->is_jmp = DISAS_EXC;
}
static void gen_smul_dual(TCGv_i32 a, TCGv_i32 b)
{
TCGv_i32 tmp1 = tcg_temp_new_i32();
TCGv_i32 tmp2 = tcg_temp_new_i32();
tcg_gen_ext16s_i32(tmp1, a);
tcg_gen_ext16s_i32(tmp2, b);
tcg_gen_mul_i32(tmp1, tmp1, tmp2);
tcg_temp_free_i32(tmp2);
tcg_gen_sari_i32(a, a, 16);
tcg_gen_sari_i32(b, b, 16);
tcg_gen_mul_i32(b, b, a);
tcg_gen_mov_i32(a, tmp1);
tcg_temp_free_i32(tmp1);
}
/* Byteswap each halfword. */
static void gen_rev16(TCGv_i32 var)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_shri_i32(tmp, var, 8);
tcg_gen_andi_i32(tmp, tmp, 0x00ff00ff);
tcg_gen_shli_i32(var, var, 8);
tcg_gen_andi_i32(var, var, 0xff00ff00);
tcg_gen_or_i32(var, var, tmp);
tcg_temp_free_i32(tmp);
}
/* Byteswap low halfword and sign extend. */
static void gen_revsh(TCGv_i32 var)
{
tcg_gen_ext16u_i32(var, var);
tcg_gen_bswap16_i32(var, var);
tcg_gen_ext16s_i32(var, var);
}
/* Unsigned bitfield extract. */
static void gen_ubfx(TCGv_i32 var, int shift, uint32_t mask)
{
if (shift)
tcg_gen_shri_i32(var, var, shift);
tcg_gen_andi_i32(var, var, mask);
}
/* Signed bitfield extract. */
static void gen_sbfx(TCGv_i32 var, int shift, int width)
{
uint32_t signbit;
if (shift)
tcg_gen_sari_i32(var, var, shift);
if (shift + width < 32) {
signbit = 1u << (width - 1);
tcg_gen_andi_i32(var, var, (1u << width) - 1);
tcg_gen_xori_i32(var, var, signbit);
tcg_gen_subi_i32(var, var, signbit);
}
}
/* Return (b << 32) + a. Mark inputs as dead */
static TCGv_i64 gen_addq_msw(TCGv_i64 a, TCGv_i32 b)
{
TCGv_i64 tmp64 = tcg_temp_new_i64();
tcg_gen_extu_i32_i64(tmp64, b);
tcg_temp_free_i32(b);
tcg_gen_shli_i64(tmp64, tmp64, 32);
tcg_gen_add_i64(a, tmp64, a);
tcg_temp_free_i64(tmp64);
return a;
}
/* Return (b << 32) - a. Mark inputs as dead. */
static TCGv_i64 gen_subq_msw(TCGv_i64 a, TCGv_i32 b)
{
TCGv_i64 tmp64 = tcg_temp_new_i64();
tcg_gen_extu_i32_i64(tmp64, b);
tcg_temp_free_i32(b);
tcg_gen_shli_i64(tmp64, tmp64, 32);
tcg_gen_sub_i64(a, tmp64, a);
tcg_temp_free_i64(tmp64);
return a;
}
/* 32x32->64 multiply. Marks inputs as dead. */
static TCGv_i64 gen_mulu_i64_i32(TCGv_i32 a, TCGv_i32 b)
{
TCGv_i32 lo = tcg_temp_new_i32();
TCGv_i32 hi = tcg_temp_new_i32();
TCGv_i64 ret;
tcg_gen_mulu2_i32(lo, hi, a, b);
tcg_temp_free_i32(a);
tcg_temp_free_i32(b);
ret = tcg_temp_new_i64();
tcg_gen_concat_i32_i64(ret, lo, hi);
tcg_temp_free_i32(lo);
tcg_temp_free_i32(hi);
return ret;
}
static TCGv_i64 gen_muls_i64_i32(TCGv_i32 a, TCGv_i32 b)
{
TCGv_i32 lo = tcg_temp_new_i32();
TCGv_i32 hi = tcg_temp_new_i32();
TCGv_i64 ret;
tcg_gen_muls2_i32(lo, hi, a, b);
tcg_temp_free_i32(a);
tcg_temp_free_i32(b);
ret = tcg_temp_new_i64();
tcg_gen_concat_i32_i64(ret, lo, hi);
tcg_temp_free_i32(lo);
tcg_temp_free_i32(hi);
return ret;
}
/* Swap low and high halfwords. */
static void gen_swap_half(TCGv_i32 var)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_shri_i32(tmp, var, 16);
tcg_gen_shli_i32(var, var, 16);
tcg_gen_or_i32(var, var, tmp);
tcg_temp_free_i32(tmp);
}
/* Dual 16-bit add. Result placed in t0 and t1 is marked as dead.
tmp = (t0 ^ t1) & 0x8000;
t0 &= ~0x8000;
t1 &= ~0x8000;
t0 = (t0 + t1) ^ tmp;
*/
static void gen_add16(TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_xor_i32(tmp, t0, t1);
tcg_gen_andi_i32(tmp, tmp, 0x8000);
tcg_gen_andi_i32(t0, t0, ~0x8000);
tcg_gen_andi_i32(t1, t1, ~0x8000);
tcg_gen_add_i32(t0, t0, t1);
tcg_gen_xor_i32(t0, t0, tmp);
tcg_temp_free_i32(tmp);
tcg_temp_free_i32(t1);
}
/* Set CF to the top bit of var. */
static void gen_set_CF_bit31(TCGv_i32 var)
{
tcg_gen_shri_i32(cpu_CF, var, 31);
}
/* Set N and Z flags from var. */
static inline void gen_logic_CC(TCGv_i32 var)
{
tcg_gen_mov_i32(cpu_NF, var);
tcg_gen_mov_i32(cpu_ZF, var);
}
/* T0 += T1 + CF. */
static void gen_adc(TCGv_i32 t0, TCGv_i32 t1)
{
tcg_gen_add_i32(t0, t0, t1);
tcg_gen_add_i32(t0, t0, cpu_CF);
}
/* dest = T0 + T1 + CF. */
static void gen_add_carry(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
tcg_gen_add_i32(dest, t0, t1);
tcg_gen_add_i32(dest, dest, cpu_CF);
}
/* dest = T0 - T1 + CF - 1. */
static void gen_sub_carry(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
tcg_gen_sub_i32(dest, t0, t1);
tcg_gen_add_i32(dest, dest, cpu_CF);
tcg_gen_subi_i32(dest, dest, 1);
}
/* dest = T0 + T1. Compute C, N, V and Z flags */
static void gen_add_CC(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, 0);
tcg_gen_add2_i32(cpu_NF, cpu_CF, t0, tmp, t1, tmp);
tcg_gen_mov_i32(cpu_ZF, cpu_NF);
tcg_gen_xor_i32(cpu_VF, cpu_NF, t0);
tcg_gen_xor_i32(tmp, t0, t1);
tcg_gen_andc_i32(cpu_VF, cpu_VF, tmp);
tcg_temp_free_i32(tmp);
tcg_gen_mov_i32(dest, cpu_NF);
}
/* dest = T0 + T1 + CF. Compute C, N, V and Z flags */
static void gen_adc_CC(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp = tcg_temp_new_i32();
if (TCG_TARGET_HAS_add2_i32) {
tcg_gen_movi_i32(tmp, 0);
tcg_gen_add2_i32(cpu_NF, cpu_CF, t0, tmp, cpu_CF, tmp);
tcg_gen_add2_i32(cpu_NF, cpu_CF, cpu_NF, cpu_CF, t1, tmp);
} else {
TCGv_i64 q0 = tcg_temp_new_i64();
TCGv_i64 q1 = tcg_temp_new_i64();
tcg_gen_extu_i32_i64(q0, t0);
tcg_gen_extu_i32_i64(q1, t1);
tcg_gen_add_i64(q0, q0, q1);
tcg_gen_extu_i32_i64(q1, cpu_CF);
tcg_gen_add_i64(q0, q0, q1);
tcg_gen_extr_i64_i32(cpu_NF, cpu_CF, q0);
tcg_temp_free_i64(q0);
tcg_temp_free_i64(q1);
}
tcg_gen_mov_i32(cpu_ZF, cpu_NF);
tcg_gen_xor_i32(cpu_VF, cpu_NF, t0);
tcg_gen_xor_i32(tmp, t0, t1);
tcg_gen_andc_i32(cpu_VF, cpu_VF, tmp);
tcg_temp_free_i32(tmp);
tcg_gen_mov_i32(dest, cpu_NF);
}
/* dest = T0 - T1. Compute C, N, V and Z flags */
static void gen_sub_CC(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp;
tcg_gen_sub_i32(cpu_NF, t0, t1);
tcg_gen_mov_i32(cpu_ZF, cpu_NF);
tcg_gen_setcond_i32(TCG_COND_GEU, cpu_CF, t0, t1);
tcg_gen_xor_i32(cpu_VF, cpu_NF, t0);
tmp = tcg_temp_new_i32();
tcg_gen_xor_i32(tmp, t0, t1);
tcg_gen_and_i32(cpu_VF, cpu_VF, tmp);
tcg_temp_free_i32(tmp);
tcg_gen_mov_i32(dest, cpu_NF);
}
/* dest = T0 + ~T1 + CF. Compute C, N, V and Z flags */
static void gen_sbc_CC(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_not_i32(tmp, t1);
gen_adc_CC(dest, t0, tmp);
tcg_temp_free_i32(tmp);
}
#define GEN_SHIFT(name) \
static void gen_##name(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1) \
{ \
TCGv_i32 tmp1, tmp2, tmp3; \
tmp1 = tcg_temp_new_i32(); \
tcg_gen_andi_i32(tmp1, t1, 0xff); \
tmp2 = tcg_const_i32(0); \
tmp3 = tcg_const_i32(0x1f); \
tcg_gen_movcond_i32(TCG_COND_GTU, tmp2, tmp1, tmp3, tmp2, t0); \
tcg_temp_free_i32(tmp3); \
tcg_gen_andi_i32(tmp1, tmp1, 0x1f); \
tcg_gen_##name##_i32(dest, tmp2, tmp1); \
tcg_temp_free_i32(tmp2); \
tcg_temp_free_i32(tmp1); \
}
GEN_SHIFT(shl)
GEN_SHIFT(shr)
#undef GEN_SHIFT
static void gen_sar(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
{
TCGv_i32 tmp1, tmp2;
tmp1 = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp1, t1, 0xff);
tmp2 = tcg_const_i32(0x1f);
tcg_gen_movcond_i32(TCG_COND_GTU, tmp1, tmp1, tmp2, tmp2, tmp1);
tcg_temp_free_i32(tmp2);
tcg_gen_sar_i32(dest, t0, tmp1);
tcg_temp_free_i32(tmp1);
}
static void tcg_gen_abs_i32(TCGv_i32 dest, TCGv_i32 src)
{
TCGv_i32 c0 = tcg_const_i32(0);
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_neg_i32(tmp, src);
tcg_gen_movcond_i32(TCG_COND_GT, dest, src, c0, src, tmp);
tcg_temp_free_i32(c0);
tcg_temp_free_i32(tmp);
}
static void shifter_out_im(TCGv_i32 var, int shift)
{
if (shift == 0) {
tcg_gen_andi_i32(cpu_CF, var, 1);
} else {
tcg_gen_shri_i32(cpu_CF, var, shift);
if (shift != 31) {
tcg_gen_andi_i32(cpu_CF, cpu_CF, 1);
}
}
}
/* Shift by immediate. Includes special handling for shift == 0. */
static inline void gen_arm_shift_im(TCGv_i32 var, int shiftop,
int shift, int flags)
{
switch (shiftop) {
case 0: /* LSL */
if (shift != 0) {
if (flags)
shifter_out_im(var, 32 - shift);
tcg_gen_shli_i32(var, var, shift);
}
break;
case 1: /* LSR */
if (shift == 0) {
if (flags) {
tcg_gen_shri_i32(cpu_CF, var, 31);
}
tcg_gen_movi_i32(var, 0);
} else {
if (flags)
shifter_out_im(var, shift - 1);
tcg_gen_shri_i32(var, var, shift);
}
break;
case 2: /* ASR */
if (shift == 0)
shift = 32;
if (flags)
shifter_out_im(var, shift - 1);
if (shift == 32)
shift = 31;
tcg_gen_sari_i32(var, var, shift);
break;
case 3: /* ROR/RRX */
if (shift != 0) {
if (flags)
shifter_out_im(var, shift - 1);
tcg_gen_rotri_i32(var, var, shift); break;
} else {
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_shli_i32(tmp, cpu_CF, 31);
if (flags)
shifter_out_im(var, 0);
tcg_gen_shri_i32(var, var, 1);
tcg_gen_or_i32(var, var, tmp);
tcg_temp_free_i32(tmp);
}
}
};
static inline void gen_arm_shift_reg(TCGv_i32 var, int shiftop,
TCGv_i32 shift, int flags)
{
if (flags) {
switch (shiftop) {
case 0: gen_helper_shl_cc(var, cpu_env, var, shift); break;
case 1: gen_helper_shr_cc(var, cpu_env, var, shift); break;
case 2: gen_helper_sar_cc(var, cpu_env, var, shift); break;
case 3: gen_helper_ror_cc(var, cpu_env, var, shift); break;
}
} else {
switch (shiftop) {
case 0:
gen_shl(var, var, shift);
break;
case 1:
gen_shr(var, var, shift);
break;
case 2:
gen_sar(var, var, shift);
break;
case 3: tcg_gen_andi_i32(shift, shift, 0x1f);
tcg_gen_rotr_i32(var, var, shift); break;
}
}
tcg_temp_free_i32(shift);
}
#define PAS_OP(pfx) \
switch (op2) { \
case 0: gen_pas_helper(glue(pfx,add16)); break; \
case 1: gen_pas_helper(glue(pfx,addsubx)); break; \
case 2: gen_pas_helper(glue(pfx,subaddx)); break; \
case 3: gen_pas_helper(glue(pfx,sub16)); break; \
case 4: gen_pas_helper(glue(pfx,add8)); break; \
case 7: gen_pas_helper(glue(pfx,sub8)); break; \
}
static void gen_arm_parallel_addsub(int op1, int op2, TCGv_i32 a, TCGv_i32 b)
{
TCGv_ptr tmp;
switch (op1) {
#define gen_pas_helper(name) glue(gen_helper_,name)(a, a, b, tmp)
case 1:
tmp = tcg_temp_new_ptr();
tcg_gen_addi_ptr(tmp, cpu_env, offsetof(CPUARMState, GE));
PAS_OP(s)
tcg_temp_free_ptr(tmp);
break;
case 5:
tmp = tcg_temp_new_ptr();
tcg_gen_addi_ptr(tmp, cpu_env, offsetof(CPUARMState, GE));
PAS_OP(u)
tcg_temp_free_ptr(tmp);
break;
#undef gen_pas_helper
#define gen_pas_helper(name) glue(gen_helper_,name)(a, a, b)
case 2:
PAS_OP(q);
break;
case 3:
PAS_OP(sh);
break;
case 6:
PAS_OP(uq);
break;
case 7:
PAS_OP(uh);
break;
#undef gen_pas_helper
}
}
#undef PAS_OP
/* For unknown reasons Arm and Thumb-2 use arbitrarily different encodings. */
#define PAS_OP(pfx) \
switch (op1) { \
case 0: gen_pas_helper(glue(pfx,add8)); break; \
case 1: gen_pas_helper(glue(pfx,add16)); break; \
case 2: gen_pas_helper(glue(pfx,addsubx)); break; \
case 4: gen_pas_helper(glue(pfx,sub8)); break; \
case 5: gen_pas_helper(glue(pfx,sub16)); break; \
case 6: gen_pas_helper(glue(pfx,subaddx)); break; \
}
static void gen_thumb2_parallel_addsub(int op1, int op2, TCGv_i32 a, TCGv_i32 b)
{
TCGv_ptr tmp;
switch (op2) {
#define gen_pas_helper(name) glue(gen_helper_,name)(a, a, b, tmp)
case 0:
tmp = tcg_temp_new_ptr();
tcg_gen_addi_ptr(tmp, cpu_env, offsetof(CPUARMState, GE));
PAS_OP(s)
tcg_temp_free_ptr(tmp);
break;
case 4:
tmp = tcg_temp_new_ptr();
tcg_gen_addi_ptr(tmp, cpu_env, offsetof(CPUARMState, GE));
PAS_OP(u)
tcg_temp_free_ptr(tmp);
break;
#undef gen_pas_helper
#define gen_pas_helper(name) glue(gen_helper_,name)(a, a, b)
case 1:
PAS_OP(q);
break;
case 2:
PAS_OP(sh);
break;
case 5:
PAS_OP(uq);
break;
case 6:
PAS_OP(uh);
break;
#undef gen_pas_helper
}
}
#undef PAS_OP
/*
* Generate a conditional based on ARM condition code cc.
* This is common between ARM and Aarch64 targets.
*/
void arm_test_cc(DisasCompare *cmp, int cc)
{
TCGv_i32 value;
TCGCond cond;
bool global = true;
switch (cc) {
case 0: /* eq: Z */
case 1: /* ne: !Z */
cond = TCG_COND_EQ;
value = cpu_ZF;
break;
case 2: /* cs: C */
case 3: /* cc: !C */
cond = TCG_COND_NE;
value = cpu_CF;
break;
case 4: /* mi: N */
case 5: /* pl: !N */
cond = TCG_COND_LT;
value = cpu_NF;
break;
case 6: /* vs: V */
case 7: /* vc: !V */
cond = TCG_COND_LT;
value = cpu_VF;
break;
case 8: /* hi: C && !Z */
case 9: /* ls: !C || Z -> !(C && !Z) */
cond = TCG_COND_NE;
value = tcg_temp_new_i32();
global = false;
/* CF is 1 for C, so -CF is an all-bits-set mask for C;
ZF is non-zero for !Z; so AND the two subexpressions. */
tcg_gen_neg_i32(value, cpu_CF);
tcg_gen_and_i32(value, value, cpu_ZF);
break;
case 10: /* ge: N == V -> N ^ V == 0 */
case 11: /* lt: N != V -> N ^ V != 0 */
/* Since we're only interested in the sign bit, == 0 is >= 0. */
cond = TCG_COND_GE;
value = tcg_temp_new_i32();
global = false;
tcg_gen_xor_i32(value, cpu_VF, cpu_NF);
break;
case 12: /* gt: !Z && N == V */
case 13: /* le: Z || N != V */
cond = TCG_COND_NE;
value = tcg_temp_new_i32();
global = false;
/* (N == V) is equal to the sign bit of ~(NF ^ VF). Propagate
* the sign bit then AND with ZF to yield the result. */
tcg_gen_xor_i32(value, cpu_VF, cpu_NF);
tcg_gen_sari_i32(value, value, 31);
tcg_gen_andc_i32(value, cpu_ZF, value);
break;
case 14: /* always */
case 15: /* always */
/* Use the ALWAYS condition, which will fold early.
* It doesn't matter what we use for the value. */
cond = TCG_COND_ALWAYS;
value = cpu_ZF;
goto no_invert;
default:
fprintf(stderr, "Bad condition code 0x%x\n", cc);
abort();
}
if (cc & 1) {
cond = tcg_invert_cond(cond);
}
no_invert:
cmp->cond = cond;
cmp->value = value;
cmp->value_global = global;
}
void arm_free_cc(DisasCompare *cmp)
{
if (!cmp->value_global) {
tcg_temp_free_i32(cmp->value);
}
}
void arm_jump_cc(DisasCompare *cmp, TCGLabel *label)
{
tcg_gen_brcondi_i32(cmp->cond, cmp->value, 0, label);
}
void arm_gen_test_cc(int cc, TCGLabel *label)
{
DisasCompare cmp;
arm_test_cc(&cmp, cc);
arm_jump_cc(&cmp, label);
arm_free_cc(&cmp);
}
static const uint8_t table_logic_cc[16] = {
1, /* and */
1, /* xor */
0, /* sub */
0, /* rsb */
0, /* add */
0, /* adc */
0, /* sbc */
0, /* rsc */
1, /* andl */
1, /* xorl */
0, /* cmp */
0, /* cmn */
1, /* orr */
1, /* mov */
1, /* bic */
1, /* mvn */
};
/* Set PC and Thumb state from an immediate address. */
static inline void gen_bx_im(DisasContext *s, uint32_t addr)
{
TCGv_i32 tmp;
s->is_jmp = DISAS_UPDATE;
if (s->thumb != (addr & 1)) {
tmp = tcg_temp_new_i32();
tcg_gen_movi_i32(tmp, addr & 1);
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, thumb));
tcg_temp_free_i32(tmp);
}
tcg_gen_movi_i32(cpu_R[15], addr & ~1);
}
/* Set PC and Thumb state from var. var is marked as dead. */
static inline void gen_bx(DisasContext *s, TCGv_i32 var)
{
s->is_jmp = DISAS_UPDATE;
tcg_gen_andi_i32(cpu_R[15], var, ~1);
tcg_gen_andi_i32(var, var, 1);
store_cpu_field(var, thumb);
}
/* Variant of store_reg which uses branch&exchange logic when storing
to r15 in ARM architecture v7 and above. The source must be a temporary
and will be marked as dead. */
static inline void store_reg_bx(DisasContext *s, int reg, TCGv_i32 var)
{
if (reg == 15 && ENABLE_ARCH_7) {
gen_bx(s, var);
} else {
store_reg(s, reg, var);
}
}
/* Variant of store_reg which uses branch&exchange logic when storing
* to r15 in ARM architecture v5T and above. This is used for storing
* the results of a LDR/LDM/POP into r15, and corresponds to the cases
* in the ARM ARM which use the LoadWritePC() pseudocode function. */
static inline void store_reg_from_load(DisasContext *s, int reg, TCGv_i32 var)
{
if (reg == 15 && ENABLE_ARCH_5) {
gen_bx(s, var);
} else {
store_reg(s, reg, var);
}
}
/* Abstractions of "generate code to do a guest load/store for
* AArch32", where a vaddr is always 32 bits (and is zero
* extended if we're a 64 bit core) and data is also
* 32 bits unless specifically doing a 64 bit access.
* These functions work like tcg_gen_qemu_{ld,st}* except
* that the address argument is TCGv_i32 rather than TCGv.
*/
#if TARGET_LONG_BITS == 32
#define DO_GEN_LD(SUFF, OPC) \
static inline void gen_aa32_ld##SUFF(TCGv_i32 val, TCGv_i32 addr, int index) \
{ \
tcg_gen_qemu_ld_i32(val, addr, index, OPC); \
}
#define DO_GEN_ST(SUFF, OPC) \
static inline void gen_aa32_st##SUFF(TCGv_i32 val, TCGv_i32 addr, int index) \
{ \
tcg_gen_qemu_st_i32(val, addr, index, OPC); \
}
static inline void gen_aa32_ld64(TCGv_i64 val, TCGv_i32 addr, int index)
{
tcg_gen_qemu_ld_i64(val, addr, index, MO_TEQ);
}
static inline void gen_aa32_st64(TCGv_i64 val, TCGv_i32 addr, int index)
{
tcg_gen_qemu_st_i64(val, addr, index, MO_TEQ);
}
#else
#define DO_GEN_LD(SUFF, OPC) \
static inline void gen_aa32_ld##SUFF(TCGv_i32 val, TCGv_i32 addr, int index) \
{ \
TCGv addr64 = tcg_temp_new(); \
tcg_gen_extu_i32_i64(addr64, addr); \
tcg_gen_qemu_ld_i32(val, addr64, index, OPC); \
tcg_temp_free(addr64); \
}
#define DO_GEN_ST(SUFF, OPC) \
static inline void gen_aa32_st##SUFF(TCGv_i32 val, TCGv_i32 addr, int index) \
{ \
TCGv addr64 = tcg_temp_new(); \
tcg_gen_extu_i32_i64(addr64, addr); \
tcg_gen_qemu_st_i32(val, addr64, index, OPC); \
tcg_temp_free(addr64); \
}
static inline void gen_aa32_ld64(TCGv_i64 val, TCGv_i32 addr, int index)
{
TCGv addr64 = tcg_temp_new();
tcg_gen_extu_i32_i64(addr64, addr);
tcg_gen_qemu_ld_i64(val, addr64, index, MO_TEQ);
tcg_temp_free(addr64);
}
static inline void gen_aa32_st64(TCGv_i64 val, TCGv_i32 addr, int index)
{
TCGv addr64 = tcg_temp_new();
tcg_gen_extu_i32_i64(addr64, addr);
tcg_gen_qemu_st_i64(val, addr64, index, MO_TEQ);
tcg_temp_free(addr64);
}
#endif
DO_GEN_LD(8s, MO_SB)
DO_GEN_LD(8u, MO_UB)
DO_GEN_LD(16s, MO_TESW)
DO_GEN_LD(16u, MO_TEUW)
DO_GEN_LD(32u, MO_TEUL)
DO_GEN_ST(8, MO_UB)
DO_GEN_ST(16, MO_TEUW)
DO_GEN_ST(32, MO_TEUL)
static inline void gen_set_pc_im(DisasContext *s, target_ulong val)
{
tcg_gen_movi_i32(cpu_R[15], val);
}
static inline void gen_hvc(DisasContext *s, int imm16)