aboutsummaryrefslogtreecommitdiff
path: root/bsd-user/elfload.c
blob: 95652b188743502825b7570e2e18379e658b679a (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
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
/* This is the Linux kernel elf-loading code, ported into user space */

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>

#include "qemu.h"
#include "disas/disas.h"

#ifdef _ARCH_PPC64
#undef ARCH_DLINFO
#undef ELF_PLATFORM
#undef ELF_HWCAP
#undef ELF_CLASS
#undef ELF_DATA
#undef ELF_ARCH
#endif

/* from personality.h */

/*
 * Flags for bug emulation.
 *
 * These occupy the top three bytes.
 */
enum {
        ADDR_NO_RANDOMIZE =     0x0040000,      /* disable randomization of VA space */
        FDPIC_FUNCPTRS =        0x0080000,      /* userspace function ptrs point to descriptors
                                                 * (signal handling)
                                                 */
        MMAP_PAGE_ZERO =        0x0100000,
        ADDR_COMPAT_LAYOUT =    0x0200000,
        READ_IMPLIES_EXEC =     0x0400000,
        ADDR_LIMIT_32BIT =      0x0800000,
        SHORT_INODE =           0x1000000,
        WHOLE_SECONDS =         0x2000000,
        STICKY_TIMEOUTS =       0x4000000,
        ADDR_LIMIT_3GB =        0x8000000,
};

/*
 * Personality types.
 *
 * These go in the low byte.  Avoid using the top bit, it will
 * conflict with error returns.
 */
enum {
        PER_LINUX =             0x0000,
        PER_LINUX_32BIT =       0x0000 | ADDR_LIMIT_32BIT,
        PER_LINUX_FDPIC =       0x0000 | FDPIC_FUNCPTRS,
        PER_SVR4 =              0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
        PER_SVR3 =              0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
                                         WHOLE_SECONDS | SHORT_INODE,
        PER_OSR5 =              0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
        PER_WYSEV386 =          0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_ISCR4 =             0x0005 | STICKY_TIMEOUTS,
        PER_BSD =               0x0006,
        PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
        PER_XENIX =             0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
        PER_LINUX32 =           0x0008,
        PER_LINUX32_3GB =       0x0008 | ADDR_LIMIT_3GB,
        PER_IRIX32 =            0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
        PER_IRIXN32 =           0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
        PER_IRIX64 =            0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
        PER_RISCOS =            0x000c,
        PER_SOLARIS =           0x000d | STICKY_TIMEOUTS,
        PER_UW7 =               0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
        PER_OSF4 =              0x000f,                  /* OSF/1 v4 */
        PER_HPUX =              0x0010,
        PER_MASK =              0x00ff,
};

/*
 * Return the base personality without flags.
 */
#define personality(pers)       (pers & PER_MASK)

/* this flag is uneffective under linux too, should be deleted */
#ifndef MAP_DENYWRITE
#define MAP_DENYWRITE 0
#endif

/* should probably go in elf.h */
#ifndef ELIBBAD
#define ELIBBAD 80
#endif

#ifdef TARGET_I386

#define ELF_PLATFORM get_elf_platform()

static const char *get_elf_platform(void)
{
    static char elf_platform[] = "i386";
    int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
    if (family > 6)
        family = 6;
    if (family >= 3)
        elf_platform[1] = '0' + family;
    return elf_platform;
}

#define ELF_HWCAP get_elf_hwcap()

static uint32_t get_elf_hwcap(void)
{
    X86CPU *cpu = X86_CPU(thread_cpu);

    return cpu->env.features[FEAT_1_EDX];
}

#ifdef TARGET_X86_64
#define ELF_START_MMAP 0x2aaaaab000ULL
#define elf_check_arch(x) ( ((x) == ELF_ARCH) )

#define ELF_CLASS      ELFCLASS64
#define ELF_DATA       ELFDATA2LSB
#define ELF_ARCH       EM_X86_64

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->rax = 0;
    regs->rsp = infop->start_stack;
    regs->rip = infop->entry;
    if (bsd_type == target_freebsd) {
        regs->rdi = infop->start_stack;
    }
}

#else

#define ELF_START_MMAP 0x80000000

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS       ELFCLASS32
#define ELF_DATA        ELFDATA2LSB
#define ELF_ARCH        EM_386

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->esp = infop->start_stack;
    regs->eip = infop->entry;

    /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
       starts %edx contains a pointer to a function which might be
       registered using `atexit'.  This provides a mean for the
       dynamic linker to call DT_FINI functions for shared libraries
       that have been loaded before the code runs.

       A value of 0 tells we have no such handler.  */
    regs->edx = 0;
}
#endif

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

#endif

#ifdef TARGET_ARM

#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_ARM )

#define ELF_CLASS       ELFCLASS32
#ifdef TARGET_WORDS_BIGENDIAN
#define ELF_DATA        ELFDATA2MSB
#else
#define ELF_DATA        ELFDATA2LSB
#endif
#define ELF_ARCH        EM_ARM

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    abi_long stack = infop->start_stack;
    memset(regs, 0, sizeof(*regs));
    regs->ARM_cpsr = 0x10;
    if (infop->entry & 1)
      regs->ARM_cpsr |= CPSR_T;
    regs->ARM_pc = infop->entry & 0xfffffffe;
    regs->ARM_sp = infop->start_stack;
    /* FIXME - what to for failure of get_user()? */
    get_user_ual(regs->ARM_r2, stack + 8); /* envp */
    get_user_ual(regs->ARM_r1, stack + 4); /* envp */
    /* XXX: it seems that r0 is zeroed after ! */
    regs->ARM_r0 = 0;
    /* For uClinux PIC binaries.  */
    /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
    regs->ARM_r10 = infop->start_data;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

enum
{
  ARM_HWCAP_ARM_SWP       = 1 << 0,
  ARM_HWCAP_ARM_HALF      = 1 << 1,
  ARM_HWCAP_ARM_THUMB     = 1 << 2,
  ARM_HWCAP_ARM_26BIT     = 1 << 3,
  ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
  ARM_HWCAP_ARM_FPA       = 1 << 5,
  ARM_HWCAP_ARM_VFP       = 1 << 6,
  ARM_HWCAP_ARM_EDSP      = 1 << 7,
};

#define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF              \
                    | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT     \
                    | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP)

#endif

#ifdef TARGET_SPARC
#ifdef TARGET_SPARC64

#define ELF_START_MMAP 0x80000000

#ifndef TARGET_ABI32
#define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
#else
#define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
#endif

#define ELF_CLASS   ELFCLASS64
#define ELF_DATA    ELFDATA2MSB
#define ELF_ARCH    EM_SPARCV9

#define STACK_BIAS              2047

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
#ifndef TARGET_ABI32
    regs->tstate = 0;
#endif
    regs->pc = infop->entry;
    regs->npc = regs->pc + 4;
    regs->y = 0;
#ifdef TARGET_ABI32
    regs->u_regs[14] = infop->start_stack - 16 * 4;
#else
    if (personality(infop->personality) == PER_LINUX32)
        regs->u_regs[14] = infop->start_stack - 16 * 4;
    else {
        regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
        if (bsd_type == target_freebsd) {
            regs->u_regs[8] = infop->start_stack;
            regs->u_regs[11] = infop->start_stack;
        }
    }
#endif
}

#else
#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_SPARC )

#define ELF_CLASS   ELFCLASS32
#define ELF_DATA    ELFDATA2MSB
#define ELF_ARCH    EM_SPARC

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->psr = 0;
    regs->pc = infop->entry;
    regs->npc = regs->pc + 4;
    regs->y = 0;
    regs->u_regs[14] = infop->start_stack - 16 * 4;
}

#endif
#endif

#ifdef TARGET_PPC

#define ELF_START_MMAP 0x80000000

#if defined(TARGET_PPC64) && !defined(TARGET_ABI32)

#define elf_check_arch(x) ( (x) == EM_PPC64 )

#define ELF_CLASS       ELFCLASS64

#else

#define elf_check_arch(x) ( (x) == EM_PPC )

#define ELF_CLASS       ELFCLASS32

#endif

#ifdef TARGET_WORDS_BIGENDIAN
#define ELF_DATA        ELFDATA2MSB
#else
#define ELF_DATA        ELFDATA2LSB
#endif
#define ELF_ARCH        EM_PPC

/*
 * We need to put in some extra aux table entries to tell glibc what
 * the cache block size is, so it can use the dcbz instruction safely.
 */
#define AT_DCACHEBSIZE          19
#define AT_ICACHEBSIZE          20
#define AT_UCACHEBSIZE          21
/* A special ignored type value for PPC, for glibc compatibility.  */
#define AT_IGNOREPPC            22
/*
 * The requirements here are:
 * - keep the final alignment of sp (sp & 0xf)
 * - make sure the 32-bit value at the first 16 byte aligned position of
 *   AUXV is greater than 16 for glibc compatibility.
 *   AT_IGNOREPPC is used for that.
 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
 *   even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
 */
#define DLINFO_ARCH_ITEMS       5
#define ARCH_DLINFO                                                     \
do {                                                                    \
        NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20);                              \
        NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20);                              \
        NEW_AUX_ENT(AT_UCACHEBSIZE, 0);                                 \
        /*                                                              \
         * Now handle glibc compatibility.                              \
         */                                                             \
        NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);                        \
        NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);                        \
 } while (0)

static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
{
    abi_ulong pos = infop->start_stack;
    abi_ulong tmp;
#if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
    abi_ulong entry, toc;
#endif

    _regs->gpr[1] = infop->start_stack;
#if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
    entry = ldq_raw(infop->entry) + infop->load_addr;
    toc = ldq_raw(infop->entry + 8) + infop->load_addr;
    _regs->gpr[2] = toc;
    infop->entry = entry;
#endif
    _regs->nip = infop->entry;
    /* Note that isn't exactly what regular kernel does
     * but this is what the ABI wants and is needed to allow
     * execution of PPC BSD programs.
     */
    /* FIXME - what to for failure of get_user()? */
    get_user_ual(_regs->gpr[3], pos);
    pos += sizeof(abi_ulong);
    _regs->gpr[4] = pos;
    for (tmp = 1; tmp != 0; pos += sizeof(abi_ulong))
        tmp = ldl(pos);
    _regs->gpr[5] = pos;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       4096

#endif

#ifdef TARGET_MIPS

#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_MIPS )

#ifdef TARGET_MIPS64
#define ELF_CLASS   ELFCLASS64
#else
#define ELF_CLASS   ELFCLASS32
#endif
#ifdef TARGET_WORDS_BIGENDIAN
#define ELF_DATA        ELFDATA2MSB
#else
#define ELF_DATA        ELFDATA2LSB
#endif
#define ELF_ARCH    EM_MIPS

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->cp0_status = 2 << CP0St_KSU;
    regs->cp0_epc = infop->entry;
    regs->regs[29] = infop->start_stack;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        4096

#endif /* TARGET_MIPS */

#ifdef TARGET_SH4

#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_SH )

#define ELF_CLASS ELFCLASS32
#define ELF_DATA  ELFDATA2LSB
#define ELF_ARCH  EM_SH

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
  /* Check other registers XXXXX */
  regs->pc = infop->entry;
  regs->regs[15] = infop->start_stack;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        4096

#endif

#ifdef TARGET_CRIS

#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_CRIS )

#define ELF_CLASS ELFCLASS32
#define ELF_DATA  ELFDATA2LSB
#define ELF_ARCH  EM_CRIS

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
  regs->erp = infop->entry;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        8192

#endif

#ifdef TARGET_M68K

#define ELF_START_MMAP 0x80000000

#define elf_check_arch(x) ( (x) == EM_68K )

#define ELF_CLASS       ELFCLASS32
#define ELF_DATA        ELFDATA2MSB
#define ELF_ARCH        EM_68K

/* ??? Does this need to do anything?
#define ELF_PLAT_INIT(_r) */

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->usp = infop->start_stack;
    regs->sr = 0;
    regs->pc = infop->entry;
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE       8192

#endif

#ifdef TARGET_ALPHA

#define ELF_START_MMAP (0x30000000000ULL)

#define elf_check_arch(x) ( (x) == ELF_ARCH )

#define ELF_CLASS      ELFCLASS64
#define ELF_DATA       ELFDATA2MSB
#define ELF_ARCH       EM_ALPHA

static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    regs->pc = infop->entry;
    regs->ps = 8;
    regs->usp = infop->start_stack;
    regs->unique = infop->start_data; /* ? */
    printf("Set unique value to " TARGET_FMT_lx " (" TARGET_FMT_lx ")\n",
           regs->unique, infop->start_data);
}

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE        8192

#endif /* TARGET_ALPHA */

#ifndef ELF_PLATFORM
#define ELF_PLATFORM (NULL)
#endif

#ifndef ELF_HWCAP
#define ELF_HWCAP 0
#endif

#ifdef TARGET_ABI32
#undef ELF_CLASS
#define ELF_CLASS ELFCLASS32
#undef bswaptls
#define bswaptls(ptr) bswap32s(ptr)
#endif

#include "elf.h"

struct exec
{
  unsigned int a_info;   /* Use macros N_MAGIC, etc for access */
  unsigned int a_text;   /* length of text, in bytes */
  unsigned int a_data;   /* length of data, in bytes */
  unsigned int a_bss;    /* length of uninitialized data area, in bytes */
  unsigned int a_syms;   /* length of symbol table data in file, in bytes */
  unsigned int a_entry;  /* start address */
  unsigned int a_trsize; /* length of relocation info for text, in bytes */
  unsigned int a_drsize; /* length of relocation info for data, in bytes */
};


#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define OMAGIC 0407
#define NMAGIC 0410
#define ZMAGIC 0413
#define QMAGIC 0314

/* max code+data+bss space allocated to elf interpreter */
#define INTERP_MAP_SIZE (32 * 1024 * 1024)

/* max code+data+bss+brk space allocated to ET_DYN executables */
#define ET_DYN_MAP_SIZE (128 * 1024 * 1024)

/* Necessary parameters */
#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))

#define INTERPRETER_NONE 0
#define INTERPRETER_AOUT 1
#define INTERPRETER_ELF 2

#define DLINFO_ITEMS 12

static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
{
        memcpy(to, from, n);
}

static int load_aout_interp(void * exptr, int interp_fd);

#ifdef BSWAP_NEEDED
static void bswap_ehdr(struct elfhdr *ehdr)
{
    bswap16s(&ehdr->e_type);                    /* Object file type */
    bswap16s(&ehdr->e_machine);         /* Architecture */
    bswap32s(&ehdr->e_version);         /* Object file version */
    bswaptls(&ehdr->e_entry);           /* Entry point virtual address */
    bswaptls(&ehdr->e_phoff);           /* Program header table file offset */
    bswaptls(&ehdr->e_shoff);           /* Section header table file offset */
    bswap32s(&ehdr->e_flags);           /* Processor-specific flags */
    bswap16s(&ehdr->e_ehsize);          /* ELF header size in bytes */
    bswap16s(&ehdr->e_phentsize);               /* Program header table entry size */
    bswap16s(&ehdr->e_phnum);           /* Program header table entry count */
    bswap16s(&ehdr->e_shentsize);               /* Section header table entry size */
    bswap16s(&ehdr->e_shnum);           /* Section header table entry count */
    bswap16s(&ehdr->e_shstrndx);                /* Section header string table index */
}

static void bswap_phdr(struct elf_phdr *phdr)
{
    bswap32s(&phdr->p_type);                    /* Segment type */
    bswaptls(&phdr->p_offset);          /* Segment file offset */
    bswaptls(&phdr->p_vaddr);           /* Segment virtual address */
    bswaptls(&phdr->p_paddr);           /* Segment physical address */
    bswaptls(&phdr->p_filesz);          /* Segment size in file */
    bswaptls(&phdr->p_memsz);           /* Segment size in memory */
    bswap32s(&phdr->p_flags);           /* Segment flags */
    bswaptls(&phdr->p_align);           /* Segment alignment */
}

static void bswap_shdr(struct elf_shdr *shdr)
{
    bswap32s(&shdr->sh_name);
    bswap32s(&shdr->sh_type);
    bswaptls(&shdr->sh_flags);
    bswaptls(&shdr->sh_addr);
    bswaptls(&shdr->sh_offset);
    bswaptls(&shdr->sh_size);
    bswap32s(&shdr->sh_link);
    bswap32s(&shdr->sh_info);
    bswaptls(&shdr->sh_addralign);
    bswaptls(&shdr->sh_entsize);
}

static void bswap_sym(struct elf_sym *sym)
{
    bswap32s(&sym->st_name);
    bswaptls(&sym->st_value);
    bswaptls(&sym->st_size);
    bswap16s(&sym->st_shndx);
}
#endif

/*
 * 'copy_elf_strings()' copies argument/envelope strings from user
 * memory to free pages in kernel mem. These are in a format ready
 * to be put directly into the top of new user memory.
 *
 */
static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
                                  abi_ulong p)
{
    char *tmp, *tmp1, *pag = NULL;
    int len, offset = 0;

    if (!p) {
        return 0;       /* bullet-proofing */
    }
    while (argc-- > 0) {
        tmp = argv[argc];
        if (!tmp) {
            error_report("VFS: argc is wrong");
            exit(-1);
        }
        tmp1 = tmp;
        while (*tmp++);
        len = tmp - tmp1;
        if (p < len) {  /* this shouldn't happen - 128kB */
                return 0;
        }
        while (len) {
            --p; --tmp; --len;
            if (--offset < 0) {
                offset = p % TARGET_PAGE_SIZE;
                pag = (char *)page[p/TARGET_PAGE_SIZE];
                if (!pag) {
                    pag = g_try_malloc0(TARGET_PAGE_SIZE);
                    page[p/TARGET_PAGE_SIZE] = pag;
                    if (!pag)
                        return 0;
                }
            }
            if (len == 0 || offset == 0) {
                *(pag + offset) = *tmp;
            }
            else {
              int bytes_to_copy = (len > offset) ? offset : len;
              tmp -= bytes_to_copy;
              p -= bytes_to_copy;
              offset -= bytes_to_copy;
              len -= bytes_to_copy;
              memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
            }
        }
    }
    return p;
}

static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
                                 struct image_info *info)
{
    abi_ulong stack_base, size, error;
    int i;

    /* Create enough stack to hold everything.  If we don't use
     * it for args, we'll use it for something else...
     */
    size = x86_stack_size;
    if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
        size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
    error = target_mmap(0,
                        size + qemu_host_page_size,
                        PROT_READ | PROT_WRITE,
                        MAP_PRIVATE | MAP_ANON,
                        -1, 0);
    if (error == -1) {
        perror("stk mmap");
        exit(-1);
    }
    /* we reserve one extra page at the top of the stack as guard */
    target_mprotect(error + size, qemu_host_page_size, PROT_NONE);

    stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
    p += stack_base;

    for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
        if (bprm->page[i]) {
            info->rss++;
            /* FIXME - check return value of memcpy_to_target() for failure */
            memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
            g_free(bprm->page[i]);
        }
        stack_base += TARGET_PAGE_SIZE;
    }
    return p;
}

static void set_brk(abi_ulong start, abi_ulong end)
{
        /* page-align the start and end addresses... */
        start = HOST_PAGE_ALIGN(start);
        end = HOST_PAGE_ALIGN(end);
        if (end <= start)
                return;
        if(target_mmap(start, end - start,
                       PROT_READ | PROT_WRITE | PROT_EXEC,
                       MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) {
            perror("cannot mmap brk");
            exit(-1);
        }
}


/* We need to explicitly zero any fractional pages after the data
   section (i.e. bss).  This would contain the junk from the file that
   should not be in memory. */
static void padzero(abi_ulong elf_bss, abi_ulong last_bss)
{
        abi_ulong nbyte;

        if (elf_bss >= last_bss)
                return;

        /* XXX: this is really a hack : if the real host page size is
           smaller than the target page size, some pages after the end
           of the file may not be mapped. A better fix would be to
           patch target_mmap(), but it is more complicated as the file
           size must be known */
        if (qemu_real_host_page_size < qemu_host_page_size) {
            abi_ulong end_addr, end_addr1;
            end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
                ~(qemu_real_host_page_size - 1);
            end_addr = HOST_PAGE_ALIGN(elf_bss);
            if (end_addr1 < end_addr) {
                mmap((void *)g2h(end_addr1), end_addr - end_addr1,
                     PROT_READ|PROT_WRITE|PROT_EXEC,
                     MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
            }
        }

        nbyte = elf_bss & (qemu_host_page_size-1);
        if (nbyte) {
            nbyte = qemu_host_page_size - nbyte;
            do {
                /* FIXME - what to do if put_user() fails? */
                put_user_u8(0, elf_bss);
                elf_bss++;
            } while (--nbyte);
        }
}


static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
                                   struct elfhdr * exec,
                                   abi_ulong load_addr,
                                   abi_ulong load_bias,
                                   abi_ulong interp_load_addr, int ibcs,
                                   struct image_info *info)
{
        abi_ulong sp;
        int size;
        abi_ulong u_platform;
        const char *k_platform;
        const int n = sizeof(elf_addr_t);

        sp = p;
        u_platform = 0;
        k_platform = ELF_PLATFORM;
        if (k_platform) {
            size_t len = strlen(k_platform) + 1;
            sp -= (len + n - 1) & ~(n - 1);
            u_platform = sp;
            /* FIXME - check return value of memcpy_to_target() for failure */
            memcpy_to_target(sp, k_platform, len);
        }
        /*
         * Force 16 byte _final_ alignment here for generality.
         */
        sp = sp &~ (abi_ulong)15;
        size = (DLINFO_ITEMS + 1) * 2;
        if (k_platform)
          size += 2;
#ifdef DLINFO_ARCH_ITEMS
        size += DLINFO_ARCH_ITEMS * 2;
#endif
        size += envc + argc + 2;
        size += (!ibcs ? 3 : 1);        /* argc itself */
        size *= n;
        if (size & 15)
            sp -= 16 - (size & 15);

        /* This is correct because Linux defines
         * elf_addr_t as Elf32_Off / Elf64_Off
         */
#define NEW_AUX_ENT(id, val) do {               \
            sp -= n; put_user_ual(val, sp);     \
            sp -= n; put_user_ual(id, sp);      \
          } while(0)

        NEW_AUX_ENT (AT_NULL, 0);

        /* There must be exactly DLINFO_ITEMS entries here.  */
        NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
        NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
        NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
        NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
        NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
        NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
        NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
        NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
        NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
        NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
        NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
        NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
        NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
        if (k_platform)
            NEW_AUX_ENT(AT_PLATFORM, u_platform);
#ifdef ARCH_DLINFO
        /*
         * ARCH_DLINFO must come last so platform specific code can enforce
         * special alignment requirements on the AUXV if necessary (eg. PPC).
         */
        ARCH_DLINFO;
#endif
#undef NEW_AUX_ENT

        sp = loader_build_argptr(envc, argc, sp, p, !ibcs);
        return sp;
}


static abi_ulong load_elf_interp(struct elfhdr * interp_elf_ex,
                                 int interpreter_fd,
                                 abi_ulong *interp_load_addr)
{
        struct elf_phdr *elf_phdata  =  NULL;
        struct elf_phdr *eppnt;
        abi_ulong load_addr = 0;
        int load_addr_set = 0;
        int retval;
        abi_ulong last_bss, elf_bss;
        abi_ulong error;
        int i;

        elf_bss = 0;
        last_bss = 0;
        error = 0;

#ifdef BSWAP_NEEDED
        bswap_ehdr(interp_elf_ex);
#endif
        /* First of all, some simple consistency checks */
        if ((interp_elf_ex->e_type != ET_EXEC &&
             interp_elf_ex->e_type != ET_DYN) ||
           !elf_check_arch(interp_elf_ex->e_machine)) {
                return ~((abi_ulong)0UL);
        }


        /* Now read in all of the header information */

        if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE)
            return ~(abi_ulong)0UL;

        elf_phdata =  (struct elf_phdr *)
                malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);

        if (!elf_phdata)
          return ~((abi_ulong)0UL);

        /*
         * If the size of this structure has changed, then punt, since
         * we will be doing the wrong thing.
         */
        if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) {
            free(elf_phdata);
            return ~((abi_ulong)0UL);
        }

        retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
        if(retval >= 0) {
            retval = read(interpreter_fd,
                           (char *) elf_phdata,
                           sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
        }
        if (retval < 0) {
                perror("load_elf_interp");
                exit(-1);
                free (elf_phdata);
                return retval;
        }
#ifdef BSWAP_NEEDED
        eppnt = elf_phdata;
        for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
            bswap_phdr(eppnt);
        }
#endif

        if (interp_elf_ex->e_type == ET_DYN) {
            /* in order to avoid hardcoding the interpreter load
               address in qemu, we allocate a big enough memory zone */
            error = target_mmap(0, INTERP_MAP_SIZE,
                                PROT_NONE, MAP_PRIVATE | MAP_ANON,
                                -1, 0);
            if (error == -1) {
                perror("mmap");
                exit(-1);
            }
            load_addr = error;
            load_addr_set = 1;
        }

        eppnt = elf_phdata;
        for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
          if (eppnt->p_type == PT_LOAD) {
            int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
            int elf_prot = 0;
            abi_ulong vaddr = 0;
            abi_ulong k;

            if (eppnt->p_flags & PF_R) elf_prot =  PROT_READ;
            if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
            if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
            if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
                elf_type |= MAP_FIXED;
                vaddr = eppnt->p_vaddr;
            }
            error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr),
                 eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr),
                 elf_prot,
                 elf_type,
                 interpreter_fd,
                 eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr));

            if (error == -1) {
              /* Real error */
              close(interpreter_fd);
              free(elf_phdata);
              return ~((abi_ulong)0UL);
            }

            if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
              load_addr = error;
              load_addr_set = 1;
            }

            /*
             * Find the end of the file  mapping for this phdr, and keep
             * track of the largest address we see for this.
             */
            k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
            if (k > elf_bss) elf_bss = k;

            /*
             * Do the same thing for the memory mapping - between
             * elf_bss and last_bss is the bss section.
             */
            k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
            if (k > last_bss) last_bss = k;
          }

        /* Now use mmap to map the library into memory. */

        close(interpreter_fd);

        /*
         * Now fill out the bss section.  First pad the last page up
         * to the page boundary, and then perform a mmap to make sure
         * that there are zeromapped pages up to and including the last
         * bss page.
         */
        padzero(elf_bss, last_bss);
        elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */

        /* Map the last of the bss segment */
        if (last_bss > elf_bss) {
            target_mmap(elf_bss, last_bss-elf_bss,
                        PROT_READ|PROT_WRITE|PROT_EXEC,
                        MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
        }
        free(elf_phdata);

        *interp_load_addr = load_addr;
        return ((abi_ulong) interp_elf_ex->e_entry) + load_addr;
}

static int symfind(const void *s0, const void *s1)
{
    target_ulong addr = *(target_ulong *)s0;
    struct elf_sym *sym = (struct elf_sym *)s1;
    int result = 0;
    if (addr < sym->st_value) {
        result = -1;
    } else if (addr >= sym->st_value + sym->st_size) {
        result = 1;
    }
    return result;
}

static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
{
#if ELF_CLASS == ELFCLASS32
    struct elf_sym *syms = s->disas_symtab.elf32;
#else
    struct elf_sym *syms = s->disas_symtab.elf64;
#endif

    // binary search
    struct elf_sym *sym;

    sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
    if (sym != NULL) {
        return s->disas_strtab + sym->st_name;
    }

    return "";
}

/* FIXME: This should use elf_ops.h  */
static int symcmp(const void *s0, const void *s1)
{
    struct elf_sym *sym0 = (struct elf_sym *)s0;
    struct elf_sym *sym1 = (struct elf_sym *)s1;
    return (sym0->st_value < sym1->st_value)
        ? -1
        : ((sym0->st_value > sym1->st_value) ? 1 : 0);
}

/* Best attempt to load symbols from this ELF object. */
static void load_symbols(struct elfhdr *hdr, int fd)
{
    unsigned int i, nsyms;
    struct elf_shdr sechdr, symtab, strtab;
    char *strings;
    struct syminfo *s;
    struct elf_sym *syms, *new_syms;

    lseek(fd, hdr->e_shoff, SEEK_SET);
    for (i = 0; i < hdr->e_shnum; i++) {
        if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
            return;
#ifdef BSWAP_NEEDED
        bswap_shdr(&sechdr);
#endif
        if (sechdr.sh_type == SHT_SYMTAB) {
            symtab = sechdr;
            lseek(fd, hdr->e_shoff
                  + sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
            if (read(fd, &strtab, sizeof(strtab))
                != sizeof(strtab))
                return;
#ifdef BSWAP_NEEDED
            bswap_shdr(&strtab);
#endif
            goto found;
        }
    }
    return; /* Shouldn't happen... */

 found:
    /* Now know where the strtab and symtab are.  Snarf them. */
    s = malloc(sizeof(*s));
    syms = malloc(symtab.sh_size);
    if (!syms) {
        free(s);
        return;
    }
    s->disas_strtab = strings = malloc(strtab.sh_size);
    if (!s->disas_strtab) {
        free(s);
        free(syms);
        return;
    }

    lseek(fd, symtab.sh_offset, SEEK_SET);
    if (read(fd, syms, symtab.sh_size) != symtab.sh_size) {
        free(s);
        free(syms);
        free(strings);
        return;
    }

    nsyms = symtab.sh_size / sizeof(struct elf_sym);

    i = 0;
    while (i < nsyms) {
#ifdef BSWAP_NEEDED
        bswap_sym(syms + i);
#endif
        // Throw away entries which we do not need.
        if (syms[i].st_shndx == SHN_UNDEF ||
                syms[i].st_shndx >= SHN_LORESERVE ||
                ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
            nsyms--;
            if (i < nsyms) {
                syms[i] = syms[nsyms];
            }
            continue;
        }
#if defined(TARGET_ARM) || defined (TARGET_MIPS)
        /* The bottom address bit marks a Thumb or MIPS16 symbol.  */
        syms[i].st_value &= ~(target_ulong)1;
#endif
        i++;
    }

     /* Attempt to free the storage associated with the local symbols
        that we threw away.  Whether or not this has any effect on the
        memory allocation depends on the malloc implementation and how
        many symbols we managed to discard. */
    new_syms = realloc(syms, nsyms * sizeof(*syms));
    if (new_syms == NULL) {
        free(s);
        free(syms);
        free(strings);
        return;
    }
    syms = new_syms;

    qsort(syms, nsyms, sizeof(*syms), symcmp);

    lseek(fd, strtab.sh_offset, SEEK_SET);
    if (read(fd, strings, strtab.sh_size) != strtab.sh_size) {
        free(s);
        free(syms);
        free(strings);
        return;
    }
    s->disas_num_syms = nsyms;
#if ELF_CLASS == ELFCLASS32
    s->disas_symtab.elf32 = syms;
    s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
#else
    s->disas_symtab.elf64 = syms;
    s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
#endif
    s->next = syminfos;
    syminfos = s;
}

int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
                    struct image_info * info)
{
    struct elfhdr elf_ex;
    struct elfhdr interp_elf_ex;
    struct exec interp_ex;
    int interpreter_fd = -1; /* avoid warning */
    abi_ulong load_addr, load_bias;
    int load_addr_set = 0;
    unsigned int interpreter_type = INTERPRETER_NONE;
    unsigned char ibcs2_interpreter;
    int i;
    abi_ulong mapped_addr;
    struct elf_phdr * elf_ppnt;
    struct elf_phdr *elf_phdata;
    abi_ulong elf_bss, k, elf_brk;
    int retval;
    char * elf_interpreter;
    abi_ulong elf_entry, interp_load_addr = 0;
    int status;
    abi_ulong start_code, end_code, start_data, end_data;
    abi_ulong reloc_func_desc = 0;
    abi_ulong elf_stack;
    char passed_fileno[6];

    ibcs2_interpreter = 0;
    status = 0;
    load_addr = 0;
    load_bias = 0;
    elf_ex = *((struct elfhdr *) bprm->buf);          /* exec-header */
#ifdef BSWAP_NEEDED
    bswap_ehdr(&elf_ex);
#endif

    /* First of all, some simple consistency checks */
    if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
                                (! elf_check_arch(elf_ex.e_machine))) {
            return -ENOEXEC;
    }

    bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
    bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
    bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
    if (!bprm->p) {
        retval = -E2BIG;
    }

    /* Now read in all of the header information */
    elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
    if (elf_phdata == NULL) {
        return -ENOMEM;
    }

    retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
    if(retval > 0) {
        retval = read(bprm->fd, (char *) elf_phdata,
                                elf_ex.e_phentsize * elf_ex.e_phnum);
    }

    if (retval < 0) {
        perror("load_elf_binary");
        exit(-1);
        free (elf_phdata);
        return -errno;
    }

#ifdef BSWAP_NEEDED
    elf_ppnt = elf_phdata;
    for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
        bswap_phdr(elf_ppnt);
    }
#endif
    elf_ppnt = elf_phdata;

    elf_bss = 0;
    elf_brk = 0;


    elf_stack = ~((abi_ulong)0UL);
    elf_interpreter = NULL;
    start_code = ~((abi_ulong)0UL);
    end_code = 0;
    start_data = 0;
    end_data = 0;
    interp_ex.a_info = 0;

    for(i=0;i < elf_ex.e_phnum; i++) {
        if (elf_ppnt->p_type == PT_INTERP) {
            if ( elf_interpreter != NULL )
            {
                free (elf_phdata);
                free(elf_interpreter);
                close(bprm->fd);
                return -EINVAL;
            }

            /* This is the program interpreter used for
             * shared libraries - for now assume that this
             * is an a.out format binary
             */

            elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);

            if (elf_interpreter == NULL) {
                free (elf_phdata);
                close(bprm->fd);
                return -ENOMEM;
            }

            retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
            if(retval >= 0) {
                retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
            }
            if(retval < 0) {
                perror("load_elf_binary2");
                exit(-1);
            }

            /* If the program interpreter is one of these two,
               then assume an iBCS2 image. Otherwise assume
               a native linux image. */

            /* JRP - Need to add X86 lib dir stuff here... */

            if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
                strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
              ibcs2_interpreter = 1;
            }

#if 0
            printf("Using ELF interpreter %s\n", path(elf_interpreter));
#endif
            if (retval >= 0) {
                retval = open(path(elf_interpreter), O_RDONLY);
                if(retval >= 0) {
                    interpreter_fd = retval;
                }
                else {
                    perror(elf_interpreter);
                    exit(-1);
                    /* retval = -errno; */
                }
            }

            if (retval >= 0) {
                retval = lseek(interpreter_fd, 0, SEEK_SET);
                if(retval >= 0) {
                    retval = read(interpreter_fd,bprm->buf,128);
                }
            }
            if (retval >= 0) {
                interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
                interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */
            }
            if (retval < 0) {
                perror("load_elf_binary3");
                exit(-1);
                free (elf_phdata);
                free(elf_interpreter);
                close(bprm->fd);
                return retval;
            }
        }
        elf_ppnt++;
    }

    /* Some simple consistency checks for the interpreter */
    if (elf_interpreter){
        interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;

        /* Now figure out which format our binary is */
        if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
                (N_MAGIC(interp_ex) != QMAGIC)) {
          interpreter_type = INTERPRETER_ELF;
        }

        if (interp_elf_ex.e_ident[0] != 0x7f ||
                strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
            interpreter_type &= ~INTERPRETER_ELF;
        }

        if (!interpreter_type) {
            free(elf_interpreter);
            free(elf_phdata);
            close(bprm->fd);
            return -ELIBBAD;
        }
    }

    /* OK, we are done with that, now set up the arg stuff,
       and then start this sucker up */

    {
        char * passed_p;

        if (interpreter_type == INTERPRETER_AOUT) {
            snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
            passed_p = passed_fileno;

            if (elf_interpreter) {
                bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
                bprm->argc++;
            }
        }
        if (!bprm->p) {
            if (elf_interpreter) {
                free(elf_interpreter);
            }
            free (elf_phdata);
            close(bprm->fd);
            return -E2BIG;
        }
    }

    /* OK, This is the point of no return */
    info->end_data = 0;
    info->end_code = 0;
    info->start_mmap = (abi_ulong)ELF_START_MMAP;
    info->mmap = 0;
    elf_entry = (abi_ulong) elf_ex.e_entry;

#if defined(CONFIG_USE_GUEST_BASE)
    /*
     * In case where user has not explicitly set the guest_base, we
     * probe here that should we set it automatically.
     */
    if (!have_guest_base) {
        /*
         * Go through ELF program header table and find out whether
	 * any of the segments drop below our current mmap_min_addr and
         * in that case set guest_base to corresponding address.
         */
        for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum;
            i++, elf_ppnt++) {
            if (elf_ppnt->p_type != PT_LOAD)
                continue;
            if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) {
                guest_base = HOST_PAGE_ALIGN(mmap_min_addr);
                break;
            }
        }
    }
#endif /* CONFIG_USE_GUEST_BASE */

    /* Do this so that we can load the interpreter, if need be.  We will
       change some of these later */
    info->rss = 0;
    bprm->p = setup_arg_pages(bprm->p, bprm, info);
    info->start_stack = bprm->p;

    /* Now we do a little grungy work by mmaping the ELF image into
     * the correct location in memory.  At this point, we assume that
     * the image should be loaded at fixed address, not at a variable
     * address.
     */

    for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
        int elf_prot = 0;
        int elf_flags = 0;
        abi_ulong error;

        if (elf_ppnt->p_type != PT_LOAD)
            continue;

        if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
        if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
        if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
        elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
        if (elf_ex.e_type == ET_EXEC || load_addr_set) {
            elf_flags |= MAP_FIXED;
        } else if (elf_ex.e_type == ET_DYN) {
            /* Try and get dynamic programs out of the way of the default mmap
               base, as well as whatever program they might try to exec.  This
               is because the brk will follow the loader, and is not movable.  */
            /* NOTE: for qemu, we do a big mmap to get enough space
               without hardcoding any address */
            error = target_mmap(0, ET_DYN_MAP_SIZE,
                                PROT_NONE, MAP_PRIVATE | MAP_ANON,
                                -1, 0);
            if (error == -1) {
                perror("mmap");
                exit(-1);
            }
            load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
        }

        error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
                            (elf_ppnt->p_filesz +
                             TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
                            elf_prot,
                            (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
                            bprm->fd,
                            (elf_ppnt->p_offset -
                             TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
        if (error == -1) {
            perror("mmap");
            exit(-1);
        }

#ifdef LOW_ELF_STACK
        if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
            elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
#endif

        if (!load_addr_set) {
            load_addr_set = 1;
            load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
            if (elf_ex.e_type == ET_DYN) {
                load_bias += error -
                    TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
                load_addr += load_bias;
                reloc_func_desc = load_bias;
            }
        }
        k = elf_ppnt->p_vaddr;
        if (k < start_code)
            start_code = k;
        if (start_data < k)
            start_data = k;
        k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
        if (k > elf_bss)
            elf_bss = k;
        if ((elf_ppnt->p_flags & PF_X) && end_code <  k)
            end_code = k;
        if (end_data < k)
            end_data = k;
        k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
        if (k > elf_brk) elf_brk = k;
    }

    elf_entry += load_bias;
    elf_bss += load_bias;
    elf_brk += load_bias;
    start_code += load_bias;
    end_code += load_bias;
    start_data += load_bias;
    end_data += load_bias;

    if (elf_interpreter) {
        if (interpreter_type & 1) {
            elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
        }
        else if (interpreter_type & 2) {
            elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
                                            &interp_load_addr);
        }
        reloc_func_desc = interp_load_addr;

        close(interpreter_fd);
        free(elf_interpreter);

        if (elf_entry == ~((abi_ulong)0UL)) {
            printf("Unable to load interpreter\n");
            free(elf_phdata);
            exit(-1);
            return 0;
        }
    }

    free(elf_phdata);

    if (qemu_log_enabled())
        load_symbols(&elf_ex, bprm->fd);

    if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
    info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);

#ifdef LOW_ELF_STACK
    info->start_stack = bprm->p = elf_stack - 4;
#endif
    bprm->p = create_elf_tables(bprm->p,
                    bprm->argc,
                    bprm->envc,
                    &elf_ex,
                    load_addr, load_bias,
                    interp_load_addr,
                    (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
                    info);
    info->load_addr = reloc_func_desc;
    info->start_brk = info->brk = elf_brk;
    info->end_code = end_code;
    info->start_code = start_code;
    info->start_data = start_data;
    info->end_data = end_data;
    info->start_stack = bprm->p;

    /* Calling set_brk effectively mmaps the pages that we need for the bss and break
       sections */
    set_brk(elf_bss, elf_brk);

    padzero(elf_bss, elf_brk);

#if 0
    printf("(start_brk) %x\n" , info->start_brk);
    printf("(end_code) %x\n" , info->end_code);
    printf("(start_code) %x\n" , info->start_code);
    printf("(end_data) %x\n" , info->end_data);
    printf("(start_stack) %x\n" , info->start_stack);
    printf("(brk) %x\n" , info->brk);
#endif

    if ( info->personality == PER_SVR4 )
    {
            /* Why this, you ask???  Well SVr4 maps page 0 as read-only,
               and some applications "depend" upon this behavior.
               Since we do not have the power to recompile these, we
               emulate the SVr4 behavior.  Sigh.  */
            mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
                                      MAP_FIXED | MAP_PRIVATE, -1, 0);
    }

    info->entry = elf_entry;

    return 0;
}

static int load_aout_interp(void * exptr, int interp_fd)
{
    printf("a.out interpreter not yet supported\n");
    return(0);
}

void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
{
    init_thread(regs, infop);
}