aboutsummaryrefslogtreecommitdiff
path: root/bsd-user/main.c
blob: 9d370bc8f603f518d0e193216b5a873c0e1d7ba8 (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
/*
 *  qemu user main
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/units.h"
#include "qemu/accel.h"
#include "sysemu/tcg.h"
#include "qemu-version.h"
#include <machine/trap.h>

#include "qapi/error.h"
#include "qemu.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/path.h"
#include "qemu/help_option.h"
#include "qemu/module.h"
#include "exec/exec-all.h"
#include "tcg/tcg.h"
#include "qemu/timer.h"
#include "qemu/envlist.h"
#include "qemu/cutils.h"
#include "exec/log.h"
#include "trace/control.h"

int singlestep;
unsigned long mmap_min_addr;
uintptr_t guest_base;
bool have_guest_base;
unsigned long reserved_va;

static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
const char *qemu_uname_release;
enum BSDType bsd_type;

/*
 * XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
 * we allocate a bigger stack. Need a better solution, for example
 * by remapping the process stack directly at the right place
 */
unsigned long x86_stack_size = 512 * 1024;

void gemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

#if defined(TARGET_I386)
int cpu_get_pic_interrupt(CPUX86State *env)
{
    return -1;
}
#endif

void fork_start(void)
{
}

void fork_end(int child)
{
    if (child) {
        gdbserver_fork(thread_cpu);
    }
}

#ifdef TARGET_I386
/***********************************************************/
/* CPUX86 core interface */

uint64_t cpu_get_tsc(CPUX86State *env)
{
    return cpu_get_host_ticks();
}

static void write_dt(void *ptr, unsigned long addr, unsigned long limit,
                     int flags)
{
    unsigned int e1, e2;
    uint32_t *p;
    e1 = (addr << 16) | (limit & 0xffff);
    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
    e2 |= flags;
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

static uint64_t *idt_table;
#ifdef TARGET_X86_64
static void set_gate64(void *ptr, unsigned int type, unsigned int dpl,
                       uint64_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
    p[2] = tswap32(addr >> 32);
    p[3] = 0;
}
/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate64(idt_table + n * 2, 0, dpl, 0, 0);
}
#else
static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
                     uint32_t addr, unsigned int sel)
{
    uint32_t *p, e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    p = ptr;
    p[0] = tswap32(e1);
    p[1] = tswap32(e2);
}

/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate(idt_table + n, 0, dpl, 0, 0);
}
#endif

void cpu_loop(CPUX86State *env)
{
    CPUState *cs = env_cpu(env);
    int trapnr;
    abi_ulong pc;
    /* target_siginfo_t info; */

    for (;;) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case 0x80:
            /* syscall from int $0x80 */
            if (bsd_type == target_freebsd) {
                abi_ulong params = (abi_ulong) env->regs[R_ESP] +
                    sizeof(int32_t);
                int32_t syscall_nr = env->regs[R_EAX];
                int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;

                if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
                    get_user_s32(syscall_nr, params);
                    params += sizeof(int32_t);
                } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
                    get_user_s32(syscall_nr, params);
                    params += sizeof(int64_t);
                }
                get_user_s32(arg1, params);
                params += sizeof(int32_t);
                get_user_s32(arg2, params);
                params += sizeof(int32_t);
                get_user_s32(arg3, params);
                params += sizeof(int32_t);
                get_user_s32(arg4, params);
                params += sizeof(int32_t);
                get_user_s32(arg5, params);
                params += sizeof(int32_t);
                get_user_s32(arg6, params);
                params += sizeof(int32_t);
                get_user_s32(arg7, params);
                params += sizeof(int32_t);
                get_user_s32(arg8, params);
                env->regs[R_EAX] = do_freebsd_syscall(env,
                                                      syscall_nr,
                                                      arg1,
                                                      arg2,
                                                      arg3,
                                                      arg4,
                                                      arg5,
                                                      arg6,
                                                      arg7,
                                                      arg8);
            } else { /* if (bsd_type == target_openbsd) */
                env->regs[R_EAX] = do_openbsd_syscall(env,
                                                      env->regs[R_EAX],
                                                      env->regs[R_EBX],
                                                      env->regs[R_ECX],
                                                      env->regs[R_EDX],
                                                      env->regs[R_ESI],
                                                      env->regs[R_EDI],
                                                      env->regs[R_EBP]);
            }
            if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
                env->regs[R_EAX] = -env->regs[R_EAX];
                env->eflags |= CC_C;
            } else {
                env->eflags &= ~CC_C;
            }
            break;
#ifndef TARGET_ABI32
        case EXCP_SYSCALL:
            /* syscall from syscall instruction */
            if (bsd_type == target_freebsd) {
                env->regs[R_EAX] = do_freebsd_syscall(env,
                                                      env->regs[R_EAX],
                                                      env->regs[R_EDI],
                                                      env->regs[R_ESI],
                                                      env->regs[R_EDX],
                                                      env->regs[R_ECX],
                                                      env->regs[8],
                                                      env->regs[9], 0, 0);
            } else { /* if (bsd_type == target_openbsd) */
                env->regs[R_EAX] = do_openbsd_syscall(env,
                                                      env->regs[R_EAX],
                                                      env->regs[R_EDI],
                                                      env->regs[R_ESI],
                                                      env->regs[R_EDX],
                                                      env->regs[10],
                                                      env->regs[8],
                                                      env->regs[9]);
            }
            env->eip = env->exception_next_eip;
            if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
                env->regs[R_EAX] = -env->regs[R_EAX];
                env->eflags |= CC_C;
            } else {
                env->eflags &= ~CC_C;
            }
            break;
#endif
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        default:
            pc = env->segs[R_CS].base + env->eip;
            fprintf(stderr,
                    "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
                    (long)pc, trapnr);
            abort();
        }
        process_pending_signals(env);
    }
}
#endif

#ifdef TARGET_SPARC
#define SPARC64_STACK_BIAS 2047

/* #define DEBUG_WIN */
/*
 * WARNING: dealing with register windows _is_ complicated. More info
 * can be found at http://www.sics.se/~psm/sparcstack.html
 */
static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
{
    index = (index + cwp * 16) % (16 * env->nwindows);
    /*
     * wrap handling : if cwp is on the last window, then we use the
     * registers 'after' the end
     */
    if (index < 8 && env->cwp == env->nwindows - 1) {
        index += 16 * env->nwindows;
    }
    return index;
}

/* save the register window 'cwp1' */
static inline void save_window_offset(CPUSPARCState *env, int cwp1)
{
    unsigned int i;
    abi_ulong sp_ptr;

    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3) {
        sp_ptr += SPARC64_STACK_BIAS;
    }
#endif
#if defined(DEBUG_WIN)
    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for (i = 0; i < 16; i++) {
        /* FIXME - what to do if put_user() fails? */
        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
}

static void save_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->wim = new_wim;
#else
    /*
     * cansave is zero if the spill trap handler is triggered by `save` and
     * nonzero if triggered by a `flushw`
     */
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
    env->cansave++;
    env->canrestore--;
#endif
}

static void restore_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
#endif
    unsigned int i, cwp1;
    abi_ulong sp_ptr;

#ifndef TARGET_SPARC64
    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
#endif

    /* restore the invalid window */
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3) {
        sp_ptr += SPARC64_STACK_BIAS;
    }
#endif
#if defined(DEBUG_WIN)
    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for (i = 0; i < 16; i++) {
        /* FIXME - what to do if get_user() fails? */
        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
#ifdef TARGET_SPARC64
    env->canrestore++;
    if (env->cleanwin < env->nwindows - 1) {
        env->cleanwin++;
    }
    env->cansave--;
#else
    env->wim = new_wim;
#endif
}

static void flush_windows(CPUSPARCState *env)
{
    int offset, cwp1;

    offset = 1;
    for (;;) {
        /* if restore would invoke restore_window(), then we can stop */
        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
#ifndef TARGET_SPARC64
        if (env->wim & (1 << cwp1)) {
            break;
        }
#else
        if (env->canrestore == 0) {
            break;
        }
        env->cansave++;
        env->canrestore--;
#endif
        save_window_offset(env, cwp1);
        offset++;
    }
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
#ifndef TARGET_SPARC64
    /* set wim so that restore will reload the registers */
    env->wim = 1 << cwp1;
#endif
#if defined(DEBUG_WIN)
    printf("flush_windows: nb=%d\n", offset - 1);
#endif
}

void cpu_loop(CPUSPARCState *env)
{
    CPUState *cs = env_cpu(env);
    int trapnr, ret, syscall_nr;
    /* target_siginfo_t info; */

    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
#ifndef TARGET_SPARC64
        case 0x80:
#else
        /* FreeBSD uses 0x141 for syscalls too */
        case 0x141:
            if (bsd_type != target_freebsd) {
                goto badtrap;
            }
            /* fallthrough */
        case 0x100:
#endif
            syscall_nr = env->gregs[1];
            if (bsd_type == target_freebsd)
                ret = do_freebsd_syscall(env, syscall_nr,
                                         env->regwptr[0], env->regwptr[1],
                                         env->regwptr[2], env->regwptr[3],
                                         env->regwptr[4], env->regwptr[5],
                                         0, 0);
            else if (bsd_type == target_netbsd)
                ret = do_netbsd_syscall(env, syscall_nr,
                                        env->regwptr[0], env->regwptr[1],
                                        env->regwptr[2], env->regwptr[3],
                                        env->regwptr[4], env->regwptr[5]);
            else { /* if (bsd_type == target_openbsd) */
#if defined(TARGET_SPARC64)
                syscall_nr &= ~(TARGET_OPENBSD_SYSCALL_G7RFLAG |
                                TARGET_OPENBSD_SYSCALL_G2RFLAG);
#endif
                ret = do_openbsd_syscall(env, syscall_nr,
                                         env->regwptr[0], env->regwptr[1],
                                         env->regwptr[2], env->regwptr[3],
                                         env->regwptr[4], env->regwptr[5]);
            }
            if ((unsigned int)ret >= (unsigned int)(-515)) {
                ret = -ret;
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc |= PSR_CARRY;
#else
                env->psr |= PSR_CARRY;
#endif
            } else {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc &= ~PSR_CARRY;
#else
                env->psr &= ~PSR_CARRY;
#endif
            }
            env->regwptr[0] = ret;
            /* next instruction */
#if defined(TARGET_SPARC64)
            if (bsd_type == target_openbsd &&
                env->gregs[1] & TARGET_OPENBSD_SYSCALL_G2RFLAG) {
                env->pc = env->gregs[2];
                env->npc = env->pc + 4;
            } else if (bsd_type == target_openbsd &&
                       env->gregs[1] & TARGET_OPENBSD_SYSCALL_G7RFLAG) {
                env->pc = env->gregs[7];
                env->npc = env->pc + 4;
            } else {
                env->pc = env->npc;
                env->npc = env->npc + 4;
            }
#else
            env->pc = env->npc;
            env->npc = env->npc + 4;
#endif
            break;
        case 0x83: /* flush windows */
#ifdef TARGET_ABI32
        case 0x103:
#endif
            flush_windows(env);
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
#ifndef TARGET_SPARC64
        case TT_WIN_OVF: /* window overflow */
            save_window(env);
            break;
        case TT_WIN_UNF: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            break;
#else
        case TT_SPILL: /* window overflow */
            save_window(env);
            break;
        case TT_FILL: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
            break;
#endif
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                gdb_handlesig(cs, TARGET_SIGTRAP);
            }
            break;
        default:
#ifdef TARGET_SPARC64
        badtrap:
#endif
            printf("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, 0);
            exit(1);
        }
        process_pending_signals(env);
    }
}

#endif

static void usage(void)
{
    printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
           "\n" QEMU_COPYRIGHT "\n"
           "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
           "BSD CPU emulator (compiled for %s emulation)\n"
           "\n"
           "Standard options:\n"
           "-h                print this help\n"
           "-g port           wait gdb connection to port\n"
           "-L path           set the elf interpreter prefix (default=%s)\n"
           "-s size           set the stack size in bytes (default=%ld)\n"
           "-cpu model        select CPU (-cpu help for list)\n"
           "-drop-ld-preload  drop LD_PRELOAD for target process\n"
           "-E var=value      sets/modifies targets environment variable(s)\n"
           "-U var            unsets targets environment variable(s)\n"
           "-B address        set guest_base address to address\n"
           "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
           "\n"
           "Debug options:\n"
           "-d item1[,...]    enable logging of specified items\n"
           "                  (use '-d help' for a list of log items)\n"
           "-D logfile        write logs to 'logfile' (default stderr)\n"
           "-p pagesize       set the host page size to 'pagesize'\n"
           "-singlestep       always run in singlestep mode\n"
           "-strace           log system calls\n"
           "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
           "                  specify tracing options\n"
           "\n"
           "Environment variables:\n"
           "QEMU_STRACE       Print system calls and arguments similar to the\n"
           "                  'strace' program.  Enable by setting to any value.\n"
           "You can use -E and -U options to set/unset environment variables\n"
           "for target process.  It is possible to provide several variables\n"
           "by repeating the option.  For example:\n"
           "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
           "Note that if you provide several changes to single variable\n"
           "last change will stay in effect.\n"
           "\n"
           QEMU_HELP_BOTTOM "\n"
           ,
           TARGET_NAME,
           interp_prefix,
           x86_stack_size);
    exit(1);
}

THREAD CPUState *thread_cpu;

bool qemu_cpu_is_self(CPUState *cpu)
{
    return thread_cpu == cpu;
}

void qemu_cpu_kick(CPUState *cpu)
{
    cpu_exit(cpu);
}

/* Assumes contents are already zeroed.  */
void init_task_state(TaskState *ts)
{
    int i;

    ts->used = 1;
    ts->first_free = ts->sigqueue_table;
    for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
        ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
    }
    ts->sigqueue_table[i].next = NULL;
}

int main(int argc, char **argv)
{
    const char *filename;
    const char *cpu_model;
    const char *cpu_type;
    const char *log_file = NULL;
    const char *log_mask = NULL;
    struct target_pt_regs regs1, *regs = &regs1;
    struct image_info info1, *info = &info1;
    TaskState ts1, *ts = &ts1;
    CPUArchState *env;
    CPUState *cpu;
    int optind, rv;
    const char *r;
    const char *gdbstub = NULL;
    char **target_environ, **wrk;
    envlist_t *envlist = NULL;
    bsd_type = target_openbsd;

    if (argc <= 1) {
        usage();
    }

    error_init(argv[0]);
    module_call_init(MODULE_INIT_TRACE);
    qemu_init_cpu_list();
    module_call_init(MODULE_INIT_QOM);

    envlist = envlist_create();

    /* add current environment into the list */
    for (wrk = environ; *wrk != NULL; wrk++) {
        (void) envlist_setenv(envlist, *wrk);
    }

    cpu_model = NULL;

    qemu_add_opts(&qemu_trace_opts);

    optind = 1;
    for (;;) {
        if (optind >= argc) {
            break;
        }
        r = argv[optind];
        if (r[0] != '-') {
            break;
        }
        optind++;
        r++;
        if (!strcmp(r, "-")) {
            break;
        } else if (!strcmp(r, "d")) {
            if (optind >= argc) {
                break;
            }
            log_mask = argv[optind++];
        } else if (!strcmp(r, "D")) {
            if (optind >= argc) {
                break;
            }
            log_file = argv[optind++];
        } else if (!strcmp(r, "E")) {
            r = argv[optind++];
            if (envlist_setenv(envlist, r) != 0) {
                usage();
            }
        } else if (!strcmp(r, "ignore-environment")) {
            envlist_free(envlist);
            envlist = envlist_create();
        } else if (!strcmp(r, "U")) {
            r = argv[optind++];
            if (envlist_unsetenv(envlist, r) != 0) {
                usage();
            }
        } else if (!strcmp(r, "s")) {
            r = argv[optind++];
            rv = qemu_strtoul(r, &r, 0, &x86_stack_size);
            if (rv < 0 || x86_stack_size <= 0) {
                usage();
            }
            if (*r == 'M') {
                x86_stack_size *= MiB;
            } else if (*r == 'k' || *r == 'K') {
                x86_stack_size *= KiB;
            }
        } else if (!strcmp(r, "L")) {
            interp_prefix = argv[optind++];
        } else if (!strcmp(r, "p")) {
            qemu_host_page_size = atoi(argv[optind++]);
            if (qemu_host_page_size == 0 ||
                (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
                fprintf(stderr, "page size must be a power of two\n");
                exit(1);
            }
        } else if (!strcmp(r, "g")) {
            gdbstub = g_strdup(argv[optind++]);
        } else if (!strcmp(r, "r")) {
            qemu_uname_release = argv[optind++];
        } else if (!strcmp(r, "cpu")) {
            cpu_model = argv[optind++];
            if (is_help_option(cpu_model)) {
                /* XXX: implement xxx_cpu_list for targets that still miss it */
#if defined(cpu_list)
                cpu_list();
#endif
                exit(1);
            }
        } else if (!strcmp(r, "B")) {
            rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
            if (rv < 0) {
                usage();
            }
            have_guest_base = true;
        } else if (!strcmp(r, "drop-ld-preload")) {
            (void) envlist_unsetenv(envlist, "LD_PRELOAD");
        } else if (!strcmp(r, "bsd")) {
            if (!strcasecmp(argv[optind], "freebsd")) {
                bsd_type = target_freebsd;
            } else if (!strcasecmp(argv[optind], "netbsd")) {
                bsd_type = target_netbsd;
            } else if (!strcasecmp(argv[optind], "openbsd")) {
                bsd_type = target_openbsd;
            } else {
                usage();
            }
            optind++;
        } else if (!strcmp(r, "singlestep")) {
            singlestep = 1;
        } else if (!strcmp(r, "strace")) {
            do_strace = 1;
        } else if (!strcmp(r, "trace")) {
            trace_opt_parse(optarg);
        } else {
            usage();
        }
    }

    /* init debug */
    qemu_log_needs_buffers();
    qemu_set_log_filename(log_file, &error_fatal);
    if (log_mask) {
        int mask;

        mask = qemu_str_to_log_mask(log_mask);
        if (!mask) {
            qemu_print_log_usage(stdout);
            exit(1);
        }
        qemu_set_log(mask);
    }

    if (optind >= argc) {
        usage();
    }
    filename = argv[optind];

    if (!trace_init_backends()) {
        exit(1);
    }
    trace_init_file();

    /* Zero out regs */
    memset(regs, 0, sizeof(struct target_pt_regs));

    /* Zero out image_info */
    memset(info, 0, sizeof(struct image_info));

    /* Scan interp_prefix dir for replacement files. */
    init_paths(interp_prefix);

    if (cpu_model == NULL) {
#if defined(TARGET_I386)
#ifdef TARGET_X86_64
        cpu_model = "qemu64";
#else
        cpu_model = "qemu32";
#endif
#elif defined(TARGET_SPARC)
#ifdef TARGET_SPARC64
        cpu_model = "TI UltraSparc II";
#else
        cpu_model = "Fujitsu MB86904";
#endif
#else
        cpu_model = "any";
#endif
    }

    cpu_type = parse_cpu_option(cpu_model);
    /* init tcg before creating CPUs and to get qemu_host_page_size */
    {
        AccelClass *ac = ACCEL_GET_CLASS(current_accel());

        accel_init_interfaces(ac);
        ac->init_machine(NULL);
    }
    cpu = cpu_create(cpu_type);
    env = cpu->env_ptr;
#if defined(TARGET_SPARC) || defined(TARGET_PPC)
    cpu_reset(cpu);
#endif
    thread_cpu = cpu;

    if (getenv("QEMU_STRACE")) {
        do_strace = 1;
    }

    target_environ = envlist_to_environ(envlist, NULL);
    envlist_free(envlist);

    /*
     * Now that page sizes are configured in tcg_exec_init() we can do
     * proper page alignment for guest_base.
     */
    guest_base = HOST_PAGE_ALIGN(guest_base);

    /*
     * Read in mmap_min_addr kernel parameter.  This value is used
     * When loading the ELF image to determine whether guest_base
     * is needed.
     *
     * When user has explicitly set the quest base, we skip this
     * test.
     */
    if (!have_guest_base) {
        FILE *fp;

        fp = fopen("/proc/sys/vm/mmap_min_addr", "r");
        if (fp != NULL) {
            unsigned long tmp;
            if (fscanf(fp, "%lu", &tmp) == 1) {
                mmap_min_addr = tmp;
                qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
                              mmap_min_addr);
            }
            fclose(fp);
        }
    }

    if (loader_exec(filename, argv + optind, target_environ, regs, info) != 0) {
        printf("Error loading %s\n", filename);
        _exit(1);
    }

    for (wrk = target_environ; *wrk; wrk++) {
        g_free(*wrk);
    }

    g_free(target_environ);

    if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
        qemu_log("guest_base  %p\n", (void *)guest_base);
        log_page_dump("binary load");

        qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
        qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
        qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
                 info->start_code);
        qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
                 info->start_data);
        qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
        qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
                 info->start_stack);
        qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
        qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
    }

    target_set_brk(info->brk);
    syscall_init();
    signal_init();

    /*
     * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
     * generating the prologue until now so that the prologue can take
     * the real value of GUEST_BASE into account.
     */
    tcg_prologue_init(tcg_ctx);
    tcg_region_init();

    /* build Task State */
    memset(ts, 0, sizeof(TaskState));
    init_task_state(ts);
    ts->info = info;
    cpu->opaque = ts;

#if defined(TARGET_I386)
    env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
    env->hflags |= HF_PE_MASK | HF_CPL_MASK;
    if (env->features[FEAT_1_EDX] & CPUID_SSE) {
        env->cr[4] |= CR4_OSFXSR_MASK;
        env->hflags |= HF_OSFXSR_MASK;
    }
#ifndef TARGET_ABI32
    /* enable 64 bit mode if possible */
    if (!(env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM)) {
        fprintf(stderr, "The selected x86 CPU does not support 64 bit mode\n");
        exit(1);
    }
    env->cr[4] |= CR4_PAE_MASK;
    env->efer |= MSR_EFER_LMA | MSR_EFER_LME;
    env->hflags |= HF_LMA_MASK;
#endif

    /* flags setup : we activate the IRQs by default as in user mode */
    env->eflags |= IF_MASK;

    /* linux register setup */
#ifndef TARGET_ABI32
    env->regs[R_EAX] = regs->rax;
    env->regs[R_EBX] = regs->rbx;
    env->regs[R_ECX] = regs->rcx;
    env->regs[R_EDX] = regs->rdx;
    env->regs[R_ESI] = regs->rsi;
    env->regs[R_EDI] = regs->rdi;
    env->regs[R_EBP] = regs->rbp;
    env->regs[R_ESP] = regs->rsp;
    env->eip = regs->rip;
#else
    env->regs[R_EAX] = regs->eax;
    env->regs[R_EBX] = regs->ebx;
    env->regs[R_ECX] = regs->ecx;
    env->regs[R_EDX] = regs->edx;
    env->regs[R_ESI] = regs->esi;
    env->regs[R_EDI] = regs->edi;
    env->regs[R_EBP] = regs->ebp;
    env->regs[R_ESP] = regs->esp;
    env->eip = regs->eip;
#endif

    /* linux interrupt setup */
#ifndef TARGET_ABI32
    env->idt.limit = 511;
#else
    env->idt.limit = 255;
#endif
    env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
                                PROT_READ | PROT_WRITE,
                                MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
    idt_table = g2h_untagged(env->idt.base);
    set_idt(0, 0);
    set_idt(1, 0);
    set_idt(2, 0);
    set_idt(3, 3);
    set_idt(4, 3);
    set_idt(5, 0);
    set_idt(6, 0);
    set_idt(7, 0);
    set_idt(8, 0);
    set_idt(9, 0);
    set_idt(10, 0);
    set_idt(11, 0);
    set_idt(12, 0);
    set_idt(13, 0);
    set_idt(14, 0);
    set_idt(15, 0);
    set_idt(16, 0);
    set_idt(17, 0);
    set_idt(18, 0);
    set_idt(19, 0);
    set_idt(0x80, 3);

    /* linux segment setup */
    {
        uint64_t *gdt_table;
        env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
                                    PROT_READ | PROT_WRITE,
                                    MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
        env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
        gdt_table = g2h_untagged(env->gdt.base);
#ifdef TARGET_ABI32
        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
#else
        /* 64 bit code segment */
        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 DESC_L_MASK |
                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
#endif
        write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                 (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
    }

    cpu_x86_load_seg(env, R_CS, __USER_CS);
    cpu_x86_load_seg(env, R_SS, __USER_DS);
#ifdef TARGET_ABI32
    cpu_x86_load_seg(env, R_DS, __USER_DS);
    cpu_x86_load_seg(env, R_ES, __USER_DS);
    cpu_x86_load_seg(env, R_FS, __USER_DS);
    cpu_x86_load_seg(env, R_GS, __USER_DS);
    /* This hack makes Wine work... */
    env->segs[R_FS].selector = 0;
#else
    cpu_x86_load_seg(env, R_DS, 0);
    cpu_x86_load_seg(env, R_ES, 0);
    cpu_x86_load_seg(env, R_FS, 0);
    cpu_x86_load_seg(env, R_GS, 0);
#endif
#elif defined(TARGET_SPARC)
    {
        int i;
        env->pc = regs->pc;
        env->npc = regs->npc;
        env->y = regs->y;
        for (i = 0; i < 8; i++) {
            env->gregs[i] = regs->u_regs[i];
        }
        for (i = 0; i < 8; i++) {
            env->regwptr[i] = regs->u_regs[i + 8];
        }
    }
#else
#error unsupported target CPU
#endif

    if (gdbstub) {
        gdbserver_start(gdbstub);
        gdb_handlesig(cpu, 0);
    }
    cpu_loop(env);
    /* never exits */
    return 0;
}