aboutsummaryrefslogtreecommitdiff
path: root/target-i386/translate-copy.c
blob: fb0bcaa3cfcb6c04989f3da179b1ccb03a7e6722 (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
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
/*
 *  i386 on i386 translation
 * 
 *  Copyright (c) 2003 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <signal.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/ucontext.h>

#include "cpu.h"
#include "exec-all.h"
#include "disas.h"

#ifdef USE_CODE_COPY

extern char exec_loop;

/* operand size */
enum {
    OT_BYTE = 0,
    OT_WORD,
    OT_LONG, 
    OT_QUAD,
};

#define PREFIX_REPZ   0x01
#define PREFIX_REPNZ  0x02
#define PREFIX_LOCK   0x04
#define PREFIX_DATA   0x08
#define PREFIX_ADR    0x10

typedef struct DisasContext {
    /* current insn context */
    int override; /* -1 if no override */
    int prefix;
    int aflag, dflag;
    uint8_t *pc; /* pc = eip + cs_base */
    int is_jmp; /* 1 = means jump (stop translation), 2 means CPU
                   static state change (stop translation) */
    /* code output */
    uint8_t *gen_code_ptr;
    uint8_t *gen_code_start;
    
    /* current block context */
    uint8_t *cs_base; /* base of CS segment */
    int pe;     /* protected mode */
    int code32; /* 32 bit code segment */
    int f_st;   /* currently unused */
    int vm86;   /* vm86 mode */
    int cpl;
    int iopl;
    int flags;
    struct TranslationBlock *tb;
} DisasContext;

#define CPU_FIELD_OFFSET(field) offsetof(CPUState, field)

#define CPU_SEG 0x64 /* fs override */

static inline void gb(DisasContext *s, uint32_t val)
{
    *s->gen_code_ptr++ = val;
}

static inline void gw(DisasContext *s, uint32_t val)
{
    *s->gen_code_ptr++ = val;
    *s->gen_code_ptr++ = val >> 8;
}

static inline void gl(DisasContext *s, uint32_t val)
{
    *s->gen_code_ptr++ = val;
    *s->gen_code_ptr++ = val >> 8;
    *s->gen_code_ptr++ = val >> 16;
    *s->gen_code_ptr++ = val >> 24;
}

static inline void gjmp(DisasContext *s, long val)
{
    gb(s, 0xe9); /* jmp */
    gl(s, val - (long)(s->gen_code_ptr + 4));
}

static inline void gen_movl_addr_im(DisasContext *s, 
                                    uint32_t addr, uint32_t val)
{
    gb(s, CPU_SEG); /* seg movl im, addr */
    gb(s, 0xc7); 
    gb(s, 0x05);
    gl(s, addr);
    gl(s, val);
}

static inline void gen_movw_addr_im(DisasContext *s, 
                                    uint32_t addr, uint32_t val)
{
    gb(s, CPU_SEG); /* seg movl im, addr */
    gb(s, 0x66); 
    gb(s, 0xc7); 
    gb(s, 0x05);
    gl(s, addr);
    gw(s, val);
}


static void gen_jmp(DisasContext *s, uint32_t target_eip)
{
    TranslationBlock *tb = s->tb;

    gb(s, 0xe9); /* jmp */
    tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
    gl(s, 0);

    tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
    gjmp(s, (long)&exec_loop);

    s->is_jmp = 1;
}

static void gen_jcc(DisasContext *s, int op,
                    uint32_t target_eip, uint32_t next_eip)
{
    TranslationBlock *tb = s->tb;

    gb(s, 0x0f); /* jcc */
    gb(s, 0x80 + op);
    tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
    gl(s, 0);
    gb(s, 0xe9); /* jmp */
    tb->tb_jmp_offset[1] = s->gen_code_ptr - s->gen_code_start;
    gl(s, 0);
    
    tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
    gjmp(s, (long)&exec_loop);

    tb->tb_next_offset[1] = s->gen_code_ptr - s->gen_code_start;
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), next_eip);
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb | 1);
    gjmp(s, (long)&exec_loop);

    s->is_jmp = 1;
}

static void gen_eob(DisasContext *s)
{
    gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), 0);
    gjmp(s, (long)&exec_loop);

    s->is_jmp = 1;
}

static inline void gen_lea_modrm(DisasContext *s, int modrm)
{
    int havesib;
    int base, disp;
    int index;
    int scale;
    int mod, rm, code;

    mod = (modrm >> 6) & 3;
    rm = modrm & 7;

    if (s->aflag) {

        havesib = 0;
        base = rm;
        index = 0;
        scale = 0;
        
        if (base == 4) {
            havesib = 1;
            code = ldub_code(s->pc++);
            scale = (code >> 6) & 3;
            index = (code >> 3) & 7;
            base = code & 7;
        }

        switch (mod) {
        case 0:
            if (base == 5) {
                base = -1;
                disp = ldl_code(s->pc);
                s->pc += 4;
            } else {
                disp = 0;
            }
            break;
        case 1:
            disp = (int8_t)ldub_code(s->pc++);
            break;
        default:
        case 2:
            disp = ldl_code(s->pc);
            s->pc += 4;
            break;
        }
        
    } else {
        switch (mod) {
        case 0:
            if (rm == 6) {
                disp = lduw_code(s->pc);
                s->pc += 2;
            } else {
                disp = 0;
            }
            break;
        case 1:
            disp = (int8_t)ldub_code(s->pc++);
            break;
        default:
        case 2:
            disp = lduw_code(s->pc);
            s->pc += 2;
            break;
        }
    }
}

static inline void parse_modrm(DisasContext *s, int modrm)
{
    if ((modrm & 0xc0) != 0xc0)
        gen_lea_modrm(s, modrm);        
}

static inline uint32_t insn_get(DisasContext *s, int ot)
{
    uint32_t ret;

    switch(ot) {
    case OT_BYTE:
        ret = ldub_code(s->pc);
        s->pc++;
        break;
    case OT_WORD:
        ret = lduw_code(s->pc);
        s->pc += 2;
        break;
    default:
    case OT_LONG:
        ret = ldl_code(s->pc);
        s->pc += 4;
        break;
    }
    return ret;
}

/* convert one instruction. s->is_jmp is set if the translation must
   be stopped.  */
static int disas_insn(DisasContext *s)
{
    uint8_t *pc_start, *pc_tmp, *pc_start_insn;
    int b, prefixes, aflag, dflag, next_eip, val;
    int ot;
    int modrm, mod, op, rm;

    pc_start = s->pc;
    prefixes = 0;
    aflag = s->code32;
    dflag = s->code32;
    s->override = -1;
 next_byte:
    b = ldub_code(s->pc);
    s->pc++;
    /* check prefixes */
    switch (b) {
    case 0xf3:
        prefixes |= PREFIX_REPZ;
        goto next_byte;
    case 0xf2:
        prefixes |= PREFIX_REPNZ;
        goto next_byte;
    case 0xf0:
        prefixes |= PREFIX_LOCK;
        goto next_byte;
    case 0x2e:
        s->override = R_CS;
        goto next_byte;
    case 0x36:
        s->override = R_SS;
        goto next_byte;
    case 0x3e:
        s->override = R_DS;
        goto next_byte;
    case 0x26:
        s->override = R_ES;
        goto next_byte;
    case 0x64:
        s->override = R_FS;
        goto next_byte;
    case 0x65:
        s->override = R_GS;
        goto next_byte;
    case 0x66:
        prefixes |= PREFIX_DATA;
        goto next_byte;
    case 0x67:
        prefixes |= PREFIX_ADR;
        goto next_byte;
    }

    if (prefixes & PREFIX_DATA)
        dflag ^= 1;
    if (prefixes & PREFIX_ADR)
        aflag ^= 1;

    s->prefix = prefixes;
    s->aflag = aflag;
    s->dflag = dflag;

    /* lock generation */
    if (prefixes & PREFIX_LOCK)
        goto unsupported_op;
    if (s->override == R_FS || s->override == R_GS || s->override == R_CS)
        goto unsupported_op;

    pc_start_insn = s->pc - 1;
    /* now check op code */
 reswitch:
    switch(b) {
    case 0x0f:
        /**************************/
        /* extended op code */
        b = ldub_code(s->pc++) | 0x100;
        goto reswitch;
        
        /**************************/
        /* arith & logic */
    case 0x00 ... 0x05:
    case 0x08 ... 0x0d:
    case 0x10 ... 0x15:
    case 0x18 ... 0x1d:
    case 0x20 ... 0x25:
    case 0x28 ... 0x2d:
    case 0x30 ... 0x35:
    case 0x38 ... 0x3d:
        {
            int f;
            f = (b >> 1) & 3;

            if ((b & 1) == 0)
                ot = OT_BYTE;
            else
                ot = dflag ? OT_LONG : OT_WORD;
            
            switch(f) {
            case 0: /* OP Ev, Gv */
                modrm = ldub_code(s->pc++);
                parse_modrm(s, modrm);
                break;
            case 1: /* OP Gv, Ev */
                modrm = ldub_code(s->pc++);
                parse_modrm(s, modrm);
                break;
            case 2: /* OP A, Iv */
                insn_get(s, ot);
                break;
            }
        }
        break;

    case 0x80: /* GRP1 */
    case 0x81:
    case 0x83:
        {
            if ((b & 1) == 0)
                ot = OT_BYTE;
            else
                ot = dflag ? OT_LONG : OT_WORD;
            
            modrm = ldub_code(s->pc++);
            parse_modrm(s, modrm);

            switch(b) {
            default:
            case 0x80:
            case 0x81:
                insn_get(s, ot);
                break;
            case 0x83:
                insn_get(s, OT_BYTE);
                break;
            }
        }
        break;

        /**************************/
        /* inc, dec, and other misc arith */
    case 0x40 ... 0x47: /* inc Gv */
        break;
    case 0x48 ... 0x4f: /* dec Gv */
        break;
    case 0xf6: /* GRP3 */
    case 0xf7:
        if ((b & 1) == 0)
            ot = OT_BYTE;
        else
            ot = dflag ? OT_LONG : OT_WORD;

        modrm = ldub_code(s->pc++);
        op = (modrm >> 3) & 7;
        parse_modrm(s, modrm);

        switch(op) {
        case 0: /* test */
            insn_get(s, ot);
            break;
        case 2: /* not */
            break;
        case 3: /* neg */
            break;
        case 4: /* mul */
            break;
        case 5: /* imul */
            break;
        case 6: /* div */
            break;
        case 7: /* idiv */
            break;
        default:
            goto illegal_op;
        }
        break;

    case 0xfe: /* GRP4 */
    case 0xff: /* GRP5 */
        if ((b & 1) == 0)
            ot = OT_BYTE;
        else
            ot = dflag ? OT_LONG : OT_WORD;

        modrm = ldub_code(s->pc++);
        mod = (modrm >> 6) & 3;
        op = (modrm >> 3) & 7;
        if (op >= 2 && b == 0xfe) {
            goto illegal_op;
        }
        pc_tmp = s->pc;
        parse_modrm(s, modrm);

        switch(op) {
        case 0: /* inc Ev */
            break;
        case 1: /* dec Ev */
            break;
        case 2: /* call Ev */
            /* XXX: optimize and handle MEM exceptions specifically
               fs movl %eax, regs[0] 
               movl Ev, %eax 
               pushl next_eip
               fs movl %eax, eip
            */
            goto unsupported_op;
        case 3: /* lcall Ev */
            goto unsupported_op;
        case 4: /* jmp Ev */
            /* XXX: optimize and handle MEM exceptions specifically
               fs movl %eax, regs[0] 
               movl Ev, %eax 
               fs movl %eax, eip
            */
            goto unsupported_op;
        case 5: /* ljmp Ev */
            goto unsupported_op;
        case 6: /* push Ev */
            break;
        default:
            goto illegal_op;
        }
        break;
    case 0xa8: /* test eAX, Iv */
    case 0xa9:
        if ((b & 1) == 0)
            ot = OT_BYTE;
        else
            ot = dflag ? OT_LONG : OT_WORD;
        insn_get(s, ot);
        break;
        
    case 0x98: /* CWDE/CBW */
        break;
    case 0x99: /* CDQ/CWD */
        break;
    case 0x1af: /* imul Gv, Ev */
    case 0x69: /* imul Gv, Ev, I */
    case 0x6b:
        ot = dflag ? OT_LONG : OT_WORD;
        modrm = ldub_code(s->pc++);
        parse_modrm(s, modrm);
        if (b == 0x69) {
            insn_get(s, ot);
        } else if (b == 0x6b) {
            insn_get(s, OT_BYTE);
        } else {
        }
        break;

    case 0x84: /* test Ev, Gv */
    case 0x85: 
        
    case 0x1c0:
    case 0x1c1: /* xadd Ev, Gv */

    case 0x1b0:
    case 0x1b1: /* cmpxchg Ev, Gv */

    case 0x8f: /* pop Ev */

    case 0x88:
    case 0x89: /* mov Gv, Ev */

    case 0x8a:
    case 0x8b: /* mov Ev, Gv */

    case 0x1b6: /* movzbS Gv, Eb */
    case 0x1b7: /* movzwS Gv, Eb */
    case 0x1be: /* movsbS Gv, Eb */
    case 0x1bf: /* movswS Gv, Eb */

    case 0x86:
    case 0x87: /* xchg Ev, Gv */

    case 0xd0:
    case 0xd1: /* shift Ev,1 */

    case 0xd2:
    case 0xd3: /* shift Ev,cl */

    case 0x1a5: /* shld cl */
    case 0x1ad: /* shrd cl */

    case 0x190 ... 0x19f: /* setcc Gv */

    /* XXX: emulate cmov if not available ? */
    case 0x140 ... 0x14f: /* cmov Gv, Ev */

    case 0x1a3: /* bt Gv, Ev */
    case 0x1ab: /* bts */
    case 0x1b3: /* btr */
    case 0x1bb: /* btc */

    case 0x1bc: /* bsf */
    case 0x1bd: /* bsr */

        modrm = ldub_code(s->pc++);
        parse_modrm(s, modrm);
        break;

    case 0x1c7: /* cmpxchg8b */
        modrm = ldub_code(s->pc++);
        mod = (modrm >> 6) & 3;
        if (mod == 3)
            goto illegal_op;
        parse_modrm(s, modrm);
        break;
        
        /**************************/
        /* push/pop */
    case 0x50 ... 0x57: /* push */
    case 0x58 ... 0x5f: /* pop */
    case 0x60: /* pusha */
    case 0x61: /* popa */
        break;

    case 0x68: /* push Iv */
    case 0x6a:
        ot = dflag ? OT_LONG : OT_WORD;
        if (b == 0x68)
            insn_get(s, ot);
        else
            insn_get(s, OT_BYTE);
        break;
    case 0xc8: /* enter */
        lduw_code(s->pc);
        s->pc += 2;
        ldub_code(s->pc++);
        break;
    case 0xc9: /* leave */
        break;

    case 0x06: /* push es */
    case 0x0e: /* push cs */
    case 0x16: /* push ss */
    case 0x1e: /* push ds */
        /* XXX: optimize:
         push segs[n].selector
        */
        goto unsupported_op;
    case 0x1a0: /* push fs */
    case 0x1a8: /* push gs */
        goto unsupported_op;
    case 0x07: /* pop es */
    case 0x17: /* pop ss */
    case 0x1f: /* pop ds */
        goto unsupported_op;
    case 0x1a1: /* pop fs */
    case 0x1a9: /* pop gs */
        goto unsupported_op;
    case 0x8e: /* mov seg, Gv */
        /* XXX: optimize:
           fs movl r, regs[]
           movl segs[].selector, r
           mov r, Gv
           fs movl regs[], r
        */
        goto unsupported_op;
    case 0x8c: /* mov Gv, seg */
        goto unsupported_op;
    case 0xc4: /* les Gv */
        op = R_ES;
        goto do_lxx;
    case 0xc5: /* lds Gv */
        op = R_DS;
        goto do_lxx;
    case 0x1b2: /* lss Gv */
        op = R_SS;
        goto do_lxx;
    case 0x1b4: /* lfs Gv */
        op = R_FS;
        goto do_lxx;
    case 0x1b5: /* lgs Gv */
        op = R_GS;
    do_lxx:
        goto unsupported_op;
        /************************/
        /* floats */
    case 0xd8 ... 0xdf: 
#if 1
        /* currently not stable enough */
        goto unsupported_op;
#else
        if (s->flags & (HF_EM_MASK | HF_TS_MASK))
            goto unsupported_op;
#endif
#if 0
        /* for testing FPU context switch */
        {
            static int count;
            count = (count + 1) % 3;
            if (count != 0)
                goto unsupported_op;
        }
#endif
        modrm = ldub_code(s->pc++);
        mod = (modrm >> 6) & 3;
        rm = modrm & 7;
        op = ((b & 7) << 3) | ((modrm >> 3) & 7);
        if (mod != 3) {
            /* memory op */
            parse_modrm(s, modrm);
            switch(op) {
            case 0x00 ... 0x07: /* fxxxs */
            case 0x10 ... 0x17: /* fixxxl */
            case 0x20 ... 0x27: /* fxxxl */
            case 0x30 ... 0x37: /* fixxx */
                break;
            case 0x08: /* flds */
            case 0x0a: /* fsts */
            case 0x0b: /* fstps */
            case 0x18: /* fildl */
            case 0x1a: /* fistl */
            case 0x1b: /* fistpl */
            case 0x28: /* fldl */
            case 0x2a: /* fstl */
            case 0x2b: /* fstpl */
            case 0x38: /* filds */
            case 0x3a: /* fists */
            case 0x3b: /* fistps */
            case 0x0c: /* fldenv mem */
            case 0x0d: /* fldcw mem */
            case 0x0e: /* fnstenv mem */
            case 0x0f: /* fnstcw mem */
            case 0x1d: /* fldt mem */
            case 0x1f: /* fstpt mem */
            case 0x2c: /* frstor mem */
            case 0x2e: /* fnsave mem */
            case 0x2f: /* fnstsw mem */
            case 0x3c: /* fbld */
            case 0x3e: /* fbstp */
            case 0x3d: /* fildll */
            case 0x3f: /* fistpll */
                break;
            default:
                goto illegal_op;
            }
        } else {
            /* register float ops */
            switch(op) {
            case 0x08: /* fld sti */
            case 0x09: /* fxchg sti */
                break;
            case 0x0a: /* grp d9/2 */
                switch(rm) {
                case 0: /* fnop */
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x0c: /* grp d9/4 */
                switch(rm) {
                case 0: /* fchs */
                case 1: /* fabs */
                case 4: /* ftst */
                case 5: /* fxam */
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x0d: /* grp d9/5 */
                switch(rm) {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x0e: /* grp d9/6 */
                break;
            case 0x0f: /* grp d9/7 */
                break;
            case 0x00: case 0x01: case 0x04 ... 0x07: /* fxxx st, sti */
            case 0x20: case 0x21: case 0x24 ... 0x27: /* fxxx sti, st */
            case 0x30: case 0x31: case 0x34 ... 0x37: /* fxxxp sti, st */
                break;
            case 0x02: /* fcom */
                break;
            case 0x03: /* fcomp */
                break;
            case 0x15: /* da/5 */
                switch(rm) {
                case 1: /* fucompp */
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x1c:
                switch(rm) {
                case 0: /* feni (287 only, just do nop here) */
                case 1: /* fdisi (287 only, just do nop here) */
                    goto unsupported_op;
                case 2: /* fclex */
                case 3: /* fninit */
                case 4: /* fsetpm (287 only, just do nop here) */
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x1d: /* fucomi */
                break;
            case 0x1e: /* fcomi */
                break;
            case 0x2a: /* fst sti */
                break;
            case 0x2b: /* fstp sti */
                break;
            case 0x2c: /* fucom st(i) */
                break;
            case 0x2d: /* fucomp st(i) */
                break;
            case 0x33: /* de/3 */
                switch(rm) {
                case 1: /* fcompp */
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x3c: /* df/4 */
                switch(rm) {
                case 0:
                    break;
                default:
                    goto illegal_op;
                }
                break;
            case 0x3d: /* fucomip */
                break;
            case 0x3e: /* fcomip */
                break;
            case 0x10 ... 0x13: /* fcmovxx */
            case 0x18 ... 0x1b:
                break;
            default:
                goto illegal_op;
            }
        }
        s->tb->cflags |= CF_TB_FP_USED;
        break;

        /**************************/
        /* mov */
    case 0xc6:
    case 0xc7: /* mov Ev, Iv */
        if ((b & 1) == 0)
            ot = OT_BYTE;
        else
            ot = dflag ? OT_LONG : OT_WORD;
        modrm = ldub_code(s->pc++);
        parse_modrm(s, modrm);
        insn_get(s, ot);
        break;

    case 0x8d: /* lea */
        ot = dflag ? OT_LONG : OT_WORD;
        modrm = ldub_code(s->pc++);
        mod = (modrm >> 6) & 3;
        if (mod == 3)
            goto illegal_op;
        parse_modrm(s, modrm);
        break;
        
    case 0xa0: /* mov EAX, Ov */
    case 0xa1:
    case 0xa2: /* mov Ov, EAX */
    case 0xa3:
        if ((b & 1) == 0)
            ot = OT_BYTE;
        else
            ot = dflag ? OT_LONG : OT_WORD;
        if (s->aflag)
            insn_get(s, OT_LONG);
        else
            insn_get(s, OT_WORD);
        break;
    case 0xd7: /* xlat */
        break;
    case 0xb0 ... 0xb7: /* mov R, Ib */
        insn_get(s, OT_BYTE);
        break;
    case 0xb8 ... 0xbf: /* mov R, Iv */
        ot = dflag ? OT_LONG : OT_WORD;
        insn_get(s, ot);
        break;

    case 0x91 ... 0x97: /* xchg R, EAX */
        break;

        /************************/
        /* shifts */
    case 0xc0:
    case 0xc1: /* shift Ev,imm */

    case 0x1a4: /* shld imm */
    case 0x1ac: /* shrd imm */
        modrm = ldub_code(s->pc++);
        parse_modrm(s, modrm);
        ldub_code(s->pc++);
        break;
        
        /************************/
        /* string ops */

    case 0xa4: /* movsS */
    case 0xa5:
        break;
        
    case 0xaa: /* stosS */
    case 0xab:
        break;

    case 0xac: /* lodsS */
    case 0xad:
        break;

    case 0xae: /* scasS */
    case 0xaf:
        break;

    case 0xa6: /* cmpsS */
    case 0xa7:
        break;

    case 0x6c: /* insS */
    case 0x6d:
        goto unsupported_op;

    case 0x6e: /* outsS */
    case 0x6f:
        goto unsupported_op;

        /************************/
        /* port I/O */
    case 0xe4:
    case 0xe5:
        goto unsupported_op;

    case 0xe6:
    case 0xe7:
        goto unsupported_op;

    case 0xec:
    case 0xed:
        goto unsupported_op;

    case 0xee:
    case 0xef:
        goto unsupported_op;

        /************************/
        /* control */
#if 0
    case 0xc2: /* ret im */
        val = ldsw_code(s->pc);
        s->pc += 2;
        gen_pop_T0(s);
        gen_stack_update(s, val + (2 << s->dflag));
        if (s->dflag == 0)
            gen_op_andl_T0_ffff();
        gen_op_jmp_T0();
        gen_eob(s);
        break;
#endif

    case 0xc3: /* ret */
        gb(s, CPU_SEG);
        if (!s->dflag)  
            gb(s, 0x66); /* d16 */
        gb(s, 0x8f); /* pop addr */
        gb(s, 0x05);
        gl(s, CPU_FIELD_OFFSET(eip));
        if (!s->dflag) {
            /* reset high bits of EIP */
            gen_movw_addr_im(s, CPU_FIELD_OFFSET(eip) + 2, 0);
        }
        gen_eob(s);
        goto no_copy;
    case 0xca: /* lret im */
    case 0xcb: /* lret */
    case 0xcf: /* iret */
    case 0x9a: /* lcall im */
    case 0xea: /* ljmp im */
        goto unsupported_op;

    case 0xe8: /* call im */
        ot = dflag ? OT_LONG : OT_WORD;
        val = insn_get(s, ot);
        next_eip = s->pc - s->cs_base;
        val += next_eip;
        if (s->dflag) {
            gb(s, 0x68); /* pushl imm */
            gl(s, next_eip);
        } else {
            gb(s, 0x66); /* pushw imm */
            gb(s, 0x68);
            gw(s, next_eip);
            val &= 0xffff;
        }
        gen_jmp(s, val);
        goto no_copy;
    case 0xe9: /* jmp */
        ot = dflag ? OT_LONG : OT_WORD;
        val = insn_get(s, ot);
        val += s->pc - s->cs_base;
        if (s->dflag == 0)
            val = val & 0xffff;
        gen_jmp(s, val);
        goto no_copy;
    case 0xeb: /* jmp Jb */
        val = (int8_t)insn_get(s, OT_BYTE);
        val += s->pc - s->cs_base;
        if (s->dflag == 0)
            val = val & 0xffff;
        gen_jmp(s, val);
        goto no_copy;
    case 0x70 ... 0x7f: /* jcc Jb */
        val = (int8_t)insn_get(s, OT_BYTE);
        goto do_jcc;
    case 0x180 ... 0x18f: /* jcc Jv */
        if (dflag) {
            val = insn_get(s, OT_LONG);
        } else {
            val = (int16_t)insn_get(s, OT_WORD); 
        }
    do_jcc:
        next_eip = s->pc - s->cs_base;
        val += next_eip;
        if (s->dflag == 0)
            val &= 0xffff;
        gen_jcc(s, b & 0xf, val, next_eip);
        goto no_copy;

        /************************/
        /* flags */
    case 0x9c: /* pushf */
        /* XXX: put specific code ? */
        goto unsupported_op;
    case 0x9d: /* popf */
        goto unsupported_op;

    case 0x9e: /* sahf */
    case 0x9f: /* lahf */
    case 0xf5: /* cmc */
    case 0xf8: /* clc */
    case 0xf9: /* stc */
    case 0xfc: /* cld */
    case 0xfd: /* std */
        break;

        /************************/
        /* bit operations */
    case 0x1ba: /* bt/bts/btr/btc Gv, im */
        ot = dflag ? OT_LONG : OT_WORD;
        modrm = ldub_code(s->pc++);
        op = (modrm >> 3) & 7;
        parse_modrm(s, modrm);
        /* load shift */
        ldub_code(s->pc++);
        if (op < 4)
            goto illegal_op;
        break;
        /************************/
        /* bcd */
    case 0x27: /* daa */
        break;
    case 0x2f: /* das */
        break;
    case 0x37: /* aaa */
        break;
    case 0x3f: /* aas */
        break;
    case 0xd4: /* aam */
        ldub_code(s->pc++);
        break;
    case 0xd5: /* aad */
        ldub_code(s->pc++);
        break;
        /************************/
        /* misc */
    case 0x90: /* nop */
        break;
    case 0x9b: /* fwait */
        if ((s->flags & (HF_MP_MASK | HF_TS_MASK)) == 
            (HF_MP_MASK | HF_TS_MASK)) {
            goto unsupported_op;
        }
        break;
    case 0xcc: /* int3 */
        goto unsupported_op;
    case 0xcd: /* int N */
        goto unsupported_op;
    case 0xce: /* into */
        goto unsupported_op;
    case 0xf1: /* icebp (undocumented, exits to external debugger) */
        goto unsupported_op;
    case 0xfa: /* cli */
        goto unsupported_op;
    case 0xfb: /* sti */
        goto unsupported_op;
    case 0x62: /* bound */
        modrm = ldub_code(s->pc++);
        mod = (modrm >> 6) & 3;
        if (mod == 3)
            goto illegal_op;
        parse_modrm(s, modrm);
        break;
    case 0x1c8 ... 0x1cf: /* bswap reg */
        break;
    case 0xd6: /* salc */
        break;
    case 0xe0: /* loopnz */
    case 0xe1: /* loopz */
    case 0xe2: /* loop */
    case 0xe3: /* jecxz */
        goto unsupported_op;

    case 0x130: /* wrmsr */
    case 0x132: /* rdmsr */
        goto unsupported_op;
    case 0x131: /* rdtsc */
        goto unsupported_op;
    case 0x1a2: /* cpuid */
        goto unsupported_op;
    case 0xf4: /* hlt */
        goto unsupported_op;
    case 0x100:
        goto unsupported_op;
    case 0x101:
        goto unsupported_op;
    case 0x108: /* invd */
    case 0x109: /* wbinvd */
        goto unsupported_op;
    case 0x63: /* arpl */
        goto unsupported_op;
    case 0x102: /* lar */
    case 0x103: /* lsl */
        goto unsupported_op;
    case 0x118:
        goto unsupported_op;
    case 0x120: /* mov reg, crN */
    case 0x122: /* mov crN, reg */
        goto unsupported_op;
    case 0x121: /* mov reg, drN */
    case 0x123: /* mov drN, reg */
        goto unsupported_op;
    case 0x106: /* clts */
        goto unsupported_op;
    default:
        goto illegal_op;
    }

    /* just copy the code */

    /* no override yet */
    if (!s->dflag)
        gb(s, 0x66);
    if (!s->aflag)
        gb(s, 0x67);
    if (prefixes & PREFIX_REPZ)
        gb(s, 0xf3);
    else if (prefixes & PREFIX_REPNZ)
        gb(s, 0xf2);
    {
        int len, i;
        len = s->pc - pc_start_insn;
        for(i = 0; i < len; i++) {
            *s->gen_code_ptr++ = ldub_code(pc_start_insn + i);
        }
    }
 no_copy:
    return 0;
 illegal_op:
 unsupported_op:
    /* fall back to slower code gen necessary */
    s->pc = pc_start;
    return -1;
}

#define GEN_CODE_MAX_SIZE      8192
#define GEN_CODE_MAX_INSN_SIZE 512

static inline int gen_intermediate_code_internal(CPUState *env,
                                                 TranslationBlock *tb, 
                                                 uint8_t *gen_code_ptr,
                                                 int *gen_code_size_ptr,
                                                 int search_pc,
                                                 uint8_t *tc_ptr)
{
    DisasContext dc1, *dc = &dc1;
    uint8_t *pc_insn, *pc_start, *gen_code_end;
    int flags, ret;
    uint8_t *cs_base;

    if (env->nb_breakpoints > 0 ||
        env->singlestep_enabled)
        return -1;
    flags = tb->flags;
    if (flags & (HF_TF_MASK | HF_ADDSEG_MASK | 
                 HF_SOFTMMU_MASK | HF_INHIBIT_IRQ_MASK))
        return -1;
    if (!(flags & HF_SS32_MASK))
        return -1;
    gen_code_end = gen_code_ptr + 
        GEN_CODE_MAX_SIZE - GEN_CODE_MAX_INSN_SIZE;
    dc->gen_code_ptr = gen_code_ptr;
    dc->gen_code_start = gen_code_ptr;

    /* generate intermediate code */
    pc_start = (uint8_t *)tb->pc;
    cs_base = (uint8_t *)tb->cs_base;
    dc->pc = pc_start;
    dc->cs_base = cs_base;
    dc->pe = (flags >> HF_PE_SHIFT) & 1;
    dc->code32 = (flags >> HF_CS32_SHIFT) & 1;
    dc->f_st = 0;
    dc->vm86 = (flags >> VM_SHIFT) & 1;
    dc->cpl = (flags >> HF_CPL_SHIFT) & 3;
    dc->iopl = (flags >> IOPL_SHIFT) & 3;
    dc->tb = tb;
    dc->flags = flags;

    dc->is_jmp = 0;

    for(;;) {
        pc_insn = dc->pc;
        ret = disas_insn(dc);
        if (ret < 0) {
            /* unsupported insn */
            if (dc->pc == pc_start) {
                /* if first instruction, signal that no copying was done */
                return -1;
            } else {
                gen_jmp(dc, dc->pc - dc->cs_base);
                dc->is_jmp = 1;
            }
        }
        if (search_pc) {
            /* search pc mode */
            if (tc_ptr < dc->gen_code_ptr) {
                env->eip = pc_insn - cs_base;
                return 0;
            }
        }
        /* stop translation if indicated */
        if (dc->is_jmp)
            break;
        /* if too long translation, stop generation */
        if (dc->gen_code_ptr >= gen_code_end ||
            (dc->pc - pc_start) >= (TARGET_PAGE_SIZE - 32)) {
            gen_jmp(dc, dc->pc - dc->cs_base);
            break;
        }
    }
    
#ifdef DEBUG_DISAS
    if (loglevel & CPU_LOG_TB_IN_ASM) {
        fprintf(logfile, "----------------\n");
        fprintf(logfile, "IN: COPY: %s fpu=%d\n", 
                lookup_symbol(pc_start),
                tb->cflags & CF_TB_FP_USED ? 1 : 0);
	disas(logfile, pc_start, dc->pc - pc_start, 0, !dc->code32);
        fprintf(logfile, "\n");
    }
#endif

    if (!search_pc) {
        *gen_code_size_ptr = dc->gen_code_ptr - dc->gen_code_start;
        tb->size = dc->pc - pc_start;
        tb->cflags |= CF_CODE_COPY;
        return 0;
    } else {
        return -1;
    }
}

/* generate code by just copying data. Return -1 if cannot generate
   any code. Return 0 if code was generated */
int cpu_gen_code_copy(CPUState *env, TranslationBlock *tb,
                      int max_code_size, int *gen_code_size_ptr)
{
    /* generate machine code */
    tb->tb_next_offset[0] = 0xffff;
    tb->tb_next_offset[1] = 0xffff;
#ifdef USE_DIRECT_JUMP
    /* the following two entries are optional (only used for string ops) */
    tb->tb_jmp_offset[2] = 0xffff;
    tb->tb_jmp_offset[3] = 0xffff;
#endif
    return gen_intermediate_code_internal(env, tb, 
                                          tb->tc_ptr, gen_code_size_ptr,
                                          0, NULL);
}

static uint8_t dummy_gen_code_buf[GEN_CODE_MAX_SIZE];

int cpu_restore_state_copy(TranslationBlock *tb, 
                           CPUState *env, unsigned long searched_pc,
                           void *puc)
{
    struct ucontext *uc = puc;
    int ret, eflags;

    /* find opc index corresponding to search_pc */
    if (searched_pc < (unsigned long)tb->tc_ptr)
        return -1;
    searched_pc = searched_pc - (long)tb->tc_ptr + (long)dummy_gen_code_buf;
    ret = gen_intermediate_code_internal(env, tb, 
                                         dummy_gen_code_buf, NULL,
                                         1, (uint8_t *)searched_pc);
    if (ret < 0)
        return ret;
    /* restore all the CPU state from the CPU context from the
       signal. The FPU context stays in the host CPU. */
    
    env->regs[R_EAX] = uc->uc_mcontext.gregs[REG_EAX];
    env->regs[R_ECX] = uc->uc_mcontext.gregs[REG_ECX];
    env->regs[R_EDX] = uc->uc_mcontext.gregs[REG_EDX];
    env->regs[R_EBX] = uc->uc_mcontext.gregs[REG_EBX];
    env->regs[R_ESP] = uc->uc_mcontext.gregs[REG_ESP];
    env->regs[R_EBP] = uc->uc_mcontext.gregs[REG_EBP];
    env->regs[R_ESI] = uc->uc_mcontext.gregs[REG_ESI];
    env->regs[R_EDI] = uc->uc_mcontext.gregs[REG_EDI];
    eflags = uc->uc_mcontext.gregs[REG_EFL];
    env->df = 1 - (2 * ((eflags >> 10) & 1));
    env->cc_src = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
    env->cc_op = CC_OP_EFLAGS;
    return 0;
}

#endif /* USE_CODE_COPY */