-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbloat.c
1911 lines (1593 loc) · 49.3 KB
/
bloat.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>
#include <getopt.h>
#include <inttypes.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/fs.h> /* BLKGETSIZE64 */
#include <x86emu.h>
#define FIRST_DISK 0x80
#define FIRST_CDROM 0xe0
#define MAX_DISKS 0x100
#include "uni.h"
typedef struct {
unsigned char scan;
unsigned char ascii;
char *name;
} bios_key_t;
#include "bios_keys.h"
typedef struct {
unsigned type;
unsigned boot:1;
unsigned valid:1;
struct {
unsigned c, h, s, lin;
} start;
struct {
unsigned c, h, s, lin;
} end;
unsigned base;
} ptable_t;
typedef struct {
x86emu_t *emu;
unsigned kbd_cnt;
unsigned key;
unsigned memsize; // in MB
unsigned a20:1;
unsigned maybe_linux_kernel:1;
unsigned is_linux_kernel:1;
struct {
char version[0x100];
char cmdline[0x1000];
unsigned loader_id;
unsigned boot_proto;
unsigned code_start;
unsigned initrd_start;
unsigned initrd_length;
unsigned cmdline_start;
} kernel;
struct {
unsigned iv_base;
int (* iv_funcs[0x100])(x86emu_t *emu);
} bios;
} vm_t;
void lprintf(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
void flush_log(x86emu_t *emu, char *buf, unsigned size);
void help(void);
uint64_t vm_read_qword(x86emu_t *emu, unsigned addr);
unsigned vm_read_segofs16(x86emu_t *emu, unsigned addr);
void vm_write_qword(x86emu_t *emu, unsigned addr, uint64_t val);
void handle_int(x86emu_t *emu, unsigned nr);
int check_ip(x86emu_t *emu);
vm_t *vm_new(void);
void vm_free(vm_t *vm);
void vm_run(vm_t *vm);
unsigned cs2s(unsigned cs);
unsigned cs2c(unsigned cs);
int do_int(x86emu_t *emu, u8 num, unsigned type);
int do_int_10(x86emu_t *emu);
int do_int_11(x86emu_t *emu);
int do_int_12(x86emu_t *emu);
int do_int_13(x86emu_t *emu);
int do_int_15(x86emu_t *emu);
int do_int_16(x86emu_t *emu);
int do_int_19(x86emu_t *emu);
int do_int_1a(x86emu_t *emu);
void prepare_bios(vm_t *vm);
void prepare_boot(x86emu_t *emu);
int file_read(x86emu_t *emu, unsigned addr, char *name, int log);
int disk_read(x86emu_t *emu, unsigned addr, unsigned disk, uint64_t sector, unsigned cnt, int log);
int disk_write(x86emu_t *emu, unsigned addr, unsigned disk, uint64_t sector, unsigned cnt, int log);
void parse_ptable(x86emu_t *emu, unsigned addr, ptable_t *ptable, unsigned base, unsigned ext_base, int entries);
int guess_geo(ptable_t *ptable, int entries, unsigned *s, unsigned *h);
void print_ptable_entry(int nr, ptable_t *ptable);
int is_ext_ptable(ptable_t *ptable);
ptable_t *find_ext_ptable(ptable_t *ptable, int entries);
void dump_ptable(x86emu_t *emu, unsigned disk);
char *get_screen(x86emu_t *emu);
void dump_screen(x86emu_t *emu);
unsigned next_bios_key(char **keys);
struct option options[] = {
{ "help", 0, NULL, 'h' },
{ "verbose", 0, NULL, 'v' },
{ "disk", 1, NULL, 1001 },
{ "floppy", 1, NULL, 1002 },
{ "cdrom", 1, NULL, 1003 },
{ "boot", 1, NULL, 1004 },
{ "show", 1, NULL, 1005 },
{ "feature", 1, NULL, 1007 },
{ "no-feature", 1, NULL, 1008 },
{ "max", 1, NULL, 1009 },
{ "log-size", 1, NULL, 1010 },
{ "keys", 1, NULL, 1011 },
{ "bootcode", 1, NULL, 1012 },
{ }
};
struct {
unsigned verbose;
unsigned inst_max;
unsigned log_size;
struct {
char *dev;
int fd;
unsigned heads;
unsigned sectors;
unsigned cylinders;
uint64_t size;
} disk[MAX_DISKS];
unsigned floppies;
unsigned disks;
unsigned cdroms;
unsigned boot;
unsigned trace_flags;
unsigned dump_flags;
struct {
unsigned rawptable:1;
} show;
struct {
unsigned edd:1;
} feature;
FILE *log_file;
char *keyboard;
char *boot_code;
} opt;
int main(int argc, char **argv)
{
char *s, *t, *dev_spec, *err_msg = NULL;
int i, j, err;
unsigned u, u2, ofs, *uu, tbits, dbits;
struct stat sbuf;
uint64_t ul;
ptable_t ptable[4];
x86emu_t *emu_0 = x86emu_new(X86EMU_PERM_R | X86EMU_PERM_W, 0);
vm_t *vm;
opt.log_file = stdout;
opt.inst_max = 10000000;
opt.feature.edd = 1;
opterr = 0;
while((i = getopt_long(argc, argv, "hv", options, NULL)) != -1) {
err = 0;
dev_spec = NULL;
switch(i) {
case 'v':
opt.verbose++;
break;
case 1001:
case 1002:
case 1003:
if(i == 1001) {
if(opt.disks >= FIRST_CDROM - FIRST_DISK) break;
uu = &opt.disks;
ofs = FIRST_DISK + opt.disks;
}
else if(i == 1002) {
if(opt.floppies >= FIRST_DISK) break;
uu = &opt.floppies;
ofs = opt.floppies;
}
else /* i == 1003 */ {
if(opt.cdroms >= MAX_DISKS - FIRST_CDROM) break;
uu = &opt.cdroms;
ofs = FIRST_CDROM + opt.cdroms;
}
dev_spec = strdup(optarg);
if((s = strchr(dev_spec, ','))) {
*s++ = 0;
}
if(!*dev_spec) {
err = 1;
break;
}
opt.disk[ofs].dev = strdup(dev_spec);
if(s) {
u = strtoul(s, &t, 0);
if((*t == 0 || *t == ',') && u <= 255) {
opt.disk[ofs].heads = u;
}
else {
err = 2;
break;
}
if(*t++ == ',') {
u = strtoul(t, &t, 0);
if(*t == 0 && u <= 63) {
opt.disk[ofs].sectors = u;
}
else {
err = 3;
break;
}
}
}
(*uu)++;
break;
case 1004:
if(!strcmp(optarg, "floppy")) {
opt.boot = 0;
}
else if(!strcmp(optarg, "disk")) {
opt.boot = FIRST_DISK;
}
else if(!strcmp(optarg, "cdrom")) {
opt.boot = FIRST_CDROM;
}
else {
u = strtoul(optarg, &s, 0);
if(s != optarg && !*s && u < MAX_DISKS) {
opt.boot = u;
}
else {
err = 4;
}
}
break;
case 1005:
for(s = optarg; (t = strsep(&s, ",")); ) {
u = 1;
tbits = dbits = 0;
while(*t == '+' || *t == '-') u = *t++ == '+' ? 1 : 0;
if(!strcmp(t, "trace")) tbits = X86EMU_TRACE_DEFAULT;
else if(!strcmp(t, "code")) tbits = X86EMU_TRACE_CODE;
else if(!strcmp(t, "regs")) tbits = X86EMU_TRACE_REGS;
else if(!strcmp(t, "data")) tbits = X86EMU_TRACE_DATA;
else if(!strcmp(t, "acc")) tbits = X86EMU_TRACE_ACC;
else if(!strcmp(t, "io")) tbits = X86EMU_TRACE_IO;
else if(!strcmp(t, "ints")) tbits = X86EMU_TRACE_INTS;
else if(!strcmp(t, "time")) tbits = X86EMU_TRACE_TIME;
else if(!strcmp(t, "debug")) tbits = X86EMU_TRACE_DEBUG;
else if(!strcmp(t, "dump")) dbits = X86EMU_DUMP_DEFAULT;
else if(!strcmp(t, "dump.regs")) dbits = X86EMU_DUMP_REGS;
else if(!strcmp(t, "dump.mem")) dbits = X86EMU_DUMP_MEM;
else if(!strcmp(t, "dump.mem.acc")) dbits = X86EMU_DUMP_ACC_MEM;
else if(!strcmp(t, "dump.mem.inv")) dbits = X86EMU_DUMP_INV_MEM;
else if(!strcmp(t, "dump.attr")) dbits = X86EMU_DUMP_ATTR;
else if(!strcmp(t, "dump.io")) dbits = X86EMU_DUMP_IO;
else if(!strcmp(t, "dump.ints")) dbits = X86EMU_DUMP_INTS;
else if(!strcmp(t, "dump.time")) dbits = X86EMU_DUMP_TIME;
else if(!strcmp(t, "rawptable")) opt.show.rawptable = u;
else err = 5;
if(err) {
err_msg = t;
}
else {
if(tbits) {
if(u) {
opt.trace_flags |= tbits;
}
else {
opt.trace_flags &= ~tbits;
}
}
if(dbits) {
if(u) {
opt.dump_flags |= dbits;
}
else {
opt.dump_flags &= ~dbits;
}
}
}
}
break;
case 1007:
case 1008:
s = optarg;
u = i == 1007 ? 1 : 0;
while((t = strsep(&s, ","))) {
if(!strcmp(t, "edd")) opt.feature.edd = u;
else err = 6;
}
break;
case 1009:
opt.inst_max = strtoul(optarg, NULL, 0);
break;
case 1010:
opt.log_size = strtoul(optarg, NULL, 0);
break;
case 1011:
opt.keyboard = optarg;
break;
case 1012:
opt.boot_code = optarg;
break;
default:
help();
return i == 'h' ? 0 : 1;
}
free(dev_spec);
if(err && (i == 1001 || i == 1002 || i == 1003)) {
fprintf(stderr, "invalid device spec: %s\n", optarg);
return 1;
}
if(err && i == 1004) {
fprintf(stderr, "invalid boot device: %s\n", optarg);
return 1;
}
if(err && (i == 1005 || i == 1006)) {
fprintf(stderr, "invalid show spec: %s\n", err_msg);
return 1;
}
if(err && (i == 1007 || i == 1008)) {
fprintf(stderr, "invalid feature: %s\n", optarg);
return 1;
}
}
if(!opt.disks && !opt.floppies && !opt.cdroms && !opt.boot_code) {
fprintf(stderr, "we need some drives\n");
return 1;
}
if(!opt.disk[opt.boot].dev) {
if(opt.disk[FIRST_CDROM].dev) {
opt.boot = FIRST_CDROM;
}
else if(opt.disk[FIRST_DISK].dev) {
opt.boot = FIRST_DISK;
}
else if(opt.disk[0].dev) {
opt.boot = 0;
}
}
lprintf("; drive map:\n");
for(i = 0; i < MAX_DISKS; i++) {
opt.disk[i].fd = -1;
if(!opt.disk[i].dev) continue;
opt.disk[i].fd = open(opt.disk[i].dev, O_RDONLY | O_LARGEFILE);
if(opt.disk[i].fd < 0) continue;
if(!opt.disk[i].heads || !opt.disk[i].sectors) {
j = disk_read(emu_0, 0, i, 0, 1, 0);
if(!j && x86emu_read_word(emu_0, 0x1fe) == 0xaa55) {
parse_ptable(emu_0, 0x1be, ptable, 0, 0, 4);
if(guess_geo(ptable, 4, &u, &u2)) {
if(!opt.disk[i].sectors) opt.disk[i].sectors = u;
if(!opt.disk[i].heads) opt.disk[i].heads = u2;
}
}
}
if(!opt.disk[i].heads) opt.disk[i].heads = 255;
if(!opt.disk[i].sectors) opt.disk[i].sectors = 63;
ul = 0;
if(!fstat(opt.disk[i].fd, &sbuf)) ul = sbuf.st_size;
if(!ul && ioctl(opt.disk[i].fd, BLKGETSIZE64, &ul)) ul = 0;
opt.disk[i].size = ul >> 9;
opt.disk[i].cylinders = opt.disk[i].size / (opt.disk[i].sectors * opt.disk[i].heads);
lprintf("; 0x%02x: %s, chs %u/%u/%u, %llu sectors\n",
i,
opt.disk[i].dev,
opt.disk[i].cylinders,
opt.disk[i].heads,
opt.disk[i].sectors,
(unsigned long long) opt.disk[i].size
);
dump_ptable(emu_0, i);
}
emu_0 = x86emu_done(emu_0);
lprintf("; boot device: 0x%02x\n", opt.boot);
fflush(stdout);
vm = vm_new();
prepare_bios(vm);
prepare_boot(vm->emu);
vm_run(vm);
dump_screen(vm->emu);
vm_free(vm);
for(u = 0; u < MAX_DISKS; u++) {
free(opt.disk[u].dev);
}
return 0;
}
void lprintf(const char *format, ...)
{
va_list args;
va_start(args, format);
if(opt.log_file) vfprintf(opt.log_file, format, args);
va_end(args);
}
void flush_log(x86emu_t *emu, char *buf, unsigned size)
{
if(!buf || !size || !opt.log_file) return;
fwrite(buf, size, 1, opt.log_file);
}
void help()
{
fprintf(stderr,
"Boot Loader Test\nUsage: bloat OPTIONS\n"
"\n"
"Options:\n"
" --boot DEVICE\n"
" boot from DEVICE\n"
" DEVICE is either a number (0-0xff) or one of: floppy, disk, cdrom\n"
" --disk device[,heads,sectors]\n"
" add hard disk image [with geometry]\n"
" --floppy device[,heads,sectors]\n"
" add floppy disk image [with geometry]\n"
" --cdrom device[,heads,sectors]\n"
" add cdrom image [with geometry]\n"
" --bootcode FILE\n"
" use FILE as bootloader (map at 0:7c00h and start)\n"
" --show LIST\n"
" Things to log. LIST is a comma-separated list of code, regs, data, acc,\n"
" io, ints, time, debug, dump.regs, dump.mem, dump.mem.acc, dump.mem.inv,\n"
" dump.attr, dump.io, dump.ints, dump.time.\n"
" Every item can be prefixed by '-' to turn it off.\n"
" Use trace and dump as shorthands for a useful combination of items\n"
" from the above list.\n"
" --feature LIST\n"
" features to enable\n"
" LIST is a comma-separated list of: edd\n"
" --no-feature LIST\n"
" features to disable (see --features)\n"
" --max N\n"
" stop after N instructions\n"
" --key STRING\n"
" use STRING as keyboard input\n"
" --log-size N\n"
" internal log buffer size\n"
" --help\n"
" show this text\n"
"examples:\n"
" bloat --floppy floppy.img --disk /dev/sda --disk foo.img --boot floppy\n"
" bloat --disk linux.img\n"
" bloat --cdrom foo.iso --show code,regs\n"
);
}
uint64_t vm_read_qword(x86emu_t *emu, unsigned addr)
{
return x86emu_read_dword(emu, addr) + ((uint64_t) x86emu_read_dword(emu, addr + 4) << 32);
}
unsigned vm_read_segofs16(x86emu_t *emu, unsigned addr)
{
return x86emu_read_word(emu, addr) + (x86emu_read_word(emu, addr + 2) << 4);
}
void vm_write_qword(x86emu_t *emu, unsigned addr, uint64_t val)
{
x86emu_write_dword(emu, addr, val);
x86emu_write_dword(emu, addr + 4, val >> 32);
}
unsigned cs2s(unsigned cs)
{
return cs & 0x3f;
}
unsigned cs2c(unsigned cs)
{
return ((cs >> 8) & 0xff) + ((cs & 0xc0) << 2);
}
int check_ip(x86emu_t *emu)
{
vm_t *vm = emu->private;
unsigned eip, u1, v;
eip = emu->x86.R_CS_BASE + emu->x86.R_EIP;
if(eip >= vm->bios.iv_base && eip < vm->bios.iv_base + 0x100) {
handle_int(emu, eip - vm->bios.iv_base);
return 0;
}
if(vm->maybe_linux_kernel) {
if(
emu->x86.R_EIP < 0x1000 &&
x86emu_read_word(emu, eip) == 0x8166 && // cmp dword [????],0x5a5aaa55
x86emu_read_dword(emu, eip + 5) == 0x5a5aaa55 &&
x86emu_read_dword(emu, emu->x86.R_CS_BASE + 0x202) == 0x53726448 // "HdrS"
) {
// very likely we are starting a linux kernel
vm->is_linux_kernel = 1;
vm->kernel.loader_id = x86emu_read_byte(emu, emu->x86.R_CS_BASE + 0x210);
vm->kernel.boot_proto = x86emu_read_word(emu, emu->x86.R_CS_BASE + 0x206);
vm->kernel.code_start = x86emu_read_dword(emu, emu->x86.R_CS_BASE + 0x214);
vm->kernel.initrd_start = x86emu_read_dword(emu, emu->x86.R_CS_BASE + 0x218);
vm->kernel.initrd_length = x86emu_read_dword(emu, emu->x86.R_CS_BASE + 0x21c);
vm->kernel.cmdline_start = x86emu_read_dword(emu, emu->x86.R_CS_BASE + 0x228);
u1 = emu->x86.R_CS_BASE + x86emu_read_word(emu, emu->x86.R_CS_BASE + 0x20e) + 0x200;
for(v = 0; v < sizeof vm->kernel.version - 1; v++) {
if(!(vm->kernel.version[v] = x86emu_read_byte(emu, u1 + v))) break;
}
vm->kernel.version[v] = 0;
for(v = 0; v < sizeof vm->kernel.cmdline - 1; v++) {
if(!(vm->kernel.cmdline[v] = x86emu_read_byte(emu, vm->kernel.cmdline_start + v))) break;
}
vm->kernel.cmdline[v] = 0;
x86emu_log(emu, "; linux kernel version = \"%s\"\n", vm->kernel.version);
x86emu_log(emu, "; boot proto = %u.%u, loader id = 0x%02x\n",
vm->kernel.boot_proto >> 8, vm->kernel.boot_proto & 0xff,
vm->kernel.loader_id
);
x86emu_log(emu, "; code start = 0x%08x, initrd start = 0x%08x, length = 0x%08x\n",
vm->kernel.code_start,
vm->kernel.initrd_start, vm->kernel.initrd_length
);
x86emu_log(emu, "; cmdline start = 0x%08x\n", vm->kernel.cmdline_start);
x86emu_log(emu, "; cmdline = \"%s\"\n", vm->kernel.cmdline);
x86emu_log(emu, "# bzImage kernel start detected -- stopping\n");
return 1;
}
}
vm->maybe_linux_kernel = 0;
if(
emu->x86.R_EIP < 0x1000 &&
x86emu_read_word(emu, eip) == 0x1c75 && // jnz gfx_init_10
x86emu_read_dword(emu, eip + 2) == 0xf50073f5 // cmc ; jnc $ + 2 ; cmc
) {
x86emu_log(emu, "# gfxboot init detected -- aborting\n");
emu->x86.R_EIP += 2;
}
else if(
emu->x86.R_EIP < 0x200 &&
x86emu_read_byte(emu, eip) == 0xcb && // retf
x86emu_read_word(emu, eip + 1) == 0x8166 && // cmp dword [????],0x5a5aaa55
x86emu_read_dword(emu, eip + 6) == 0x5a5aaa55
) {
vm->maybe_linux_kernel = 1;
}
else if(
emu->x86.R_EIP == 0 &&
eip == 0x90200 &&
x86emu_read_dword(emu, 0x90000) == 0x8e07c0b8 &&
x86emu_read_dword(emu, 0x90004) == 0x9000b8d8
) {
vm->is_linux_kernel = 1;
x86emu_log(emu, "# zImage kernel start detected -- stopping\n");
return 1;
}
return 0;
}
void handle_int(x86emu_t *emu, unsigned nr)
{
vm_t *vm = emu->private;
int stop = 0;
u8 flags;
if(!vm->bios.iv_funcs[nr]) {
x86emu_log(emu, "# unhandled interrupt 0x%02x\n", nr);
stop = 1;
}
else {
stop = vm->bios.iv_funcs[nr](emu);
flags = emu->x86.R_FLG;
x86emu_write_byte(emu, emu->x86.R_SS_BASE + ((emu->x86.R_SP + 4) & 0xffff), flags);
}
if(stop) x86emu_stop(emu);
}
int do_int(x86emu_t *emu, u8 num, unsigned type)
{
if((type & 0xff) == INTR_TYPE_FAULT) {
x86emu_stop(emu);
return 0;
}
if(x86emu_read_word(emu, num * 4)) return 0;
x86emu_log(emu, "# unhandled interrupt 0x%02x\n", num);
return 1;
}
int do_int_10(x86emu_t *emu)
{
unsigned u, cnt, attr;
unsigned cur_x, cur_y, page;
unsigned x, y, x0, y0, x1, y1, width, d;
switch(emu->x86.R_AH) {
case 0x01:
x86emu_log(emu, "; int 0x10: ah 0x%02x (set cursor shape)\n", emu->x86.R_AH);
// emu->x86.R_CX: shape
break;
case 0x02:
x86emu_log(emu, "; int 0x10: ah 0x%02x (set cursor)\n", emu->x86.R_AH);
x86emu_log(emu, "; (x, y) = (%u, %u)\n", emu->x86.R_DL, emu->x86.R_DH);
page = emu->x86.R_BH & 7;
x86emu_write_byte(emu, 0x450 + 2 * page, emu->x86.R_DL); // x
x86emu_write_byte(emu, 0x451 + 2 * page, emu->x86.R_DH); // y
break;
case 0x03:
x86emu_log(emu, "; int 0x10: ah 0x%02x (get cursor)\n", emu->x86.R_AH);
page = emu->x86.R_BH & 7;
emu->x86.R_DL = x86emu_read_byte(emu, 0x450 + 2 * page); // x
emu->x86.R_DH = x86emu_read_byte(emu, 0x451 + 2 * page); // y
emu->x86.R_CX = 0x607; // cursor shape
x86emu_log(emu, "; (x, y) = (%u, %u)\n", emu->x86.R_DL, emu->x86.R_DH);
break;
case 0x06:
x86emu_log(emu, "; int 0x10: ah 0x%02x (scroll up)\n", emu->x86.R_AH);
attr = 0x20 + (emu->x86.R_BH << 8);
x0 = emu->x86.R_CL;
y0 = emu->x86.R_CH;
x1 = emu->x86.R_DL;
y1 = emu->x86.R_DH;
d = emu->x86.R_AL;
x86emu_log(emu, "; window (%u, %u) - (%u, %u), by %u lines\n", x0, y0, x1, y1, d);
width = x86emu_read_byte(emu, 0x44a);
if(x0 > width) x0 = width;
if(x1 > width) x1 = width;
u = x86emu_read_byte(emu, 0x484);
if(y0 > u) y0 = u;
if(y1 > u) y1 = u;
if(y1 > y0 && x1 > x0) {
if(d == 0) {
for(y = y0; y <= y1; y++) {
for(x = x0; x < x1; x++) {
x86emu_write_word(emu, 0xb8000 + 2 * (x + width * y), attr);
}
}
}
else {
for(y = y0; y < y1; y++) {
for(x = x0; x < x1; x++) {
u = x86emu_read_word(emu, 0xb8000 + 2 * (x + width * (y + 1)));
x86emu_write_word(emu, 0xb8000 + 2 * (x + width * y), u);
}
}
for(x = x0; x < x1; x++) {
x86emu_write_word(emu, 0xb8000 + 2 * (x + width * y), attr);
}
}
}
break;
case 0x09:
x86emu_log(emu, "; int 0x10: ah 0x%02x (write char & attr)\n", emu->x86.R_AH);
u = emu->x86.R_AL;
attr = emu->x86.R_BL;
page = emu->x86.R_BH & 7;
cnt = emu->x86.R_CX;
cur_x = x86emu_read_byte(emu, 0x450 + 2 * page);
cur_y = x86emu_read_byte(emu, 0x451 + 2 * page);
x86emu_log(emu, "; char 0x%02x '%c', attr 0x%02x, cnt %u\n", u, u >= 0x20 && u < 0x7f ? u : ' ', attr, cnt);
while(cnt--) {
x86emu_write_byte(emu, 0xb8000 + 2 * (cur_x + 80 * cur_y), u);
x86emu_write_byte(emu, 0xb8001 + 2 * (cur_x + 80 * cur_y), attr);
cur_x++;
}
break;
case 0x0e:
x86emu_log(emu, "; int 0x10: ah 0x%02x (tty print)\n", emu->x86.R_AH);
u = emu->x86.R_AL;
page = emu->x86.R_BH & 7;
cur_x = x86emu_read_byte(emu, 0x450 + 2 * page);
cur_y = x86emu_read_byte(emu, 0x451 + 2 * page);
x86emu_log(emu, "; char 0x%02x '%c'\n", u, u >= 0x20 && u < 0x7f ? u : ' ');
if(u == 0x0d) {
cur_x = 0;
}
else if(u == 0x0a) {
cur_y++;
}
else {
x86emu_write_byte(emu, 0xb8000 + 2 * (cur_x + 80 * cur_y), u);
x86emu_write_byte(emu, 0xb8001 + 2 * (cur_x + 80 * cur_y), 7);
cur_x++;
if(cur_x == 80) {
cur_x = 0;
cur_y++;
}
}
x86emu_write_byte(emu, 0x450 + 2 * page, cur_x);
x86emu_write_byte(emu, 0x451 + 2 * page, cur_y);
break;
case 0x0f:
emu->x86.R_AL = x86emu_read_byte(emu, 0x449); // vide mode
emu->x86.R_AH = x86emu_read_byte(emu, 0x44a); // screen width
emu->x86.R_BH = 0; // active page
break;
default:
x86emu_log(emu, "; int 0x10: ah 0x%02x\n", emu->x86.R_AH);
break;
}
return 0;
}
int do_int_11(x86emu_t *emu)
{
x86emu_log(emu, "; int 0x11: (get equipment list)\n");
emu->x86.R_AX = 0x4026;
x86emu_log(emu, "; eq mask: %04x\n", emu->x86.R_AX);
return 0;
}
int do_int_12(x86emu_t *emu)
{
x86emu_log(emu, "; int 0x12: (get base mem size)\n");
emu->x86.R_AX = x86emu_read_word(emu, 0x413);
x86emu_log(emu, "; base mem size: %u kB\n", emu->x86.R_AX);
return 0;
}
int do_int_13(x86emu_t *emu)
{
unsigned u, disk, cnt, sector, cylinder, head, addr;
uint64_t ul;
int i, j;
switch(emu->x86.R_AH) {
case 0x00:
x86emu_log(emu, "; int 0x13: ah 0x%02x (disk reset)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
x86emu_log(emu, "; drive 0x%02x\n", disk);
if(disk >= MAX_DISKS || !opt.disk[disk].dev) {
emu->x86.R_AH = 7;
X86EMU_SET_FLAG(emu, F_CF);
}
else {
emu->x86.R_AH = 0;
X86EMU_CLEAR_FLAG(emu, F_CF);
}
break;
case 0x02:
x86emu_log(emu, "; int 0x13: ah 0x%02x (disk read)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
cnt = emu->x86.R_AL;
head = emu->x86.R_DH;
cylinder = cs2c(emu->x86.R_CX);
sector = cs2s(emu->x86.R_CX);
addr = (emu->x86.R_ES << 4) + emu->x86.R_BX;
x86emu_log(emu, "; drive 0x%02x, chs %u/%u/%u, %u sectors, buf 0x%05x\n",
disk,
cylinder, head, sector,
cnt,
addr
);
if(cnt) {
if(!sector) {
emu->x86.R_AH = 0x04;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
ul = (cylinder * opt.disk[disk].heads + head) * opt.disk[disk].sectors + sector - 1;
i = disk_read(emu, addr, disk, ul, cnt, 1);
if(i) {
emu->x86.R_AH = 0x04;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
}
emu->x86.R_AH = 0;
X86EMU_CLEAR_FLAG(emu, F_CF);
break;
case 0x08:
x86emu_log(emu, "; int 0x13: ah 0x%02x (get drive params)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
x86emu_log(emu, "; drive 0x%02x\n", disk);
if(
disk >= MAX_DISKS ||
!opt.disk[disk].dev ||
!opt.disk[disk].sectors ||
!opt.disk[disk].heads
) {
emu->x86.R_AH = 0x07;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
X86EMU_CLEAR_FLAG(emu, F_CF);
emu->x86.R_AH = 0;
emu->x86.R_ES = 0;
emu->x86.R_DI = 0;
emu->x86.R_BL = 0;
emu->x86.R_DL = disk < 0x80 ? opt.floppies : opt.disks;
emu->x86.R_DH = opt.disk[disk].heads - 1;
u = opt.disk[disk].cylinders;
if(u > 1023) u = 1023;
emu->x86.R_CX = ((u >> 8) << 6) + ((u & 0xff) << 8) + opt.disk[disk].sectors;
break;
case 0x15:
x86emu_log(emu, "; int 0x13: ah 0x%02x (get disk type)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
x86emu_log(emu, "; drive 0x%02x\n", disk);
X86EMU_CLEAR_FLAG(emu, F_CF);
if(
disk >= MAX_DISKS ||
!opt.disk[disk].dev ||
!opt.disk[disk].sectors ||
!opt.disk[disk].heads
) {
emu->x86.R_AH = 0x00;
}
else {
emu->x86.R_AH = 3;
emu->x86.R_DX = opt.disk[disk].sectors;
emu->x86.R_CX = opt.disk[disk].sectors >> 16;
}
break;
case 0x41:
x86emu_log(emu, "; int 0x13: ah 0x%02x (edd install check)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
x86emu_log(emu, "; drive 0x%02x\n", disk);
if(!opt.feature.edd || disk >= MAX_DISKS || !opt.disk[disk].dev || emu->x86.R_BX != 0x55aa) {
emu->x86.R_AH = 1;
X86EMU_SET_FLAG(emu, F_CF);
}
else {
emu->x86.R_AX = 0x3000;
emu->x86.R_BX = 0xaa55;
emu->x86.R_CX = 0x000f;
X86EMU_CLEAR_FLAG(emu, F_CF);
}
break;
case 0x42:
x86emu_log(emu, "; int 0x13: ah 0x%02x (edd disk read)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
addr = (emu->x86.R_DS << 4) + emu->x86.R_SI;
x86emu_log(emu, "; drive 0x%02x, request packet:\n; 0x%05x:", disk, addr);
j = x86emu_read_byte(emu, addr);
j = j == 0x10 || j == 0x18 ? j : 0x10;
for(i = 0; i < j; i++) x86emu_log(emu, " %02x", x86emu_read_byte(emu, addr + i));
x86emu_log(emu, "\n");
if(
!opt.feature.edd || disk >= MAX_DISKS || !opt.disk[disk].dev ||
(x86emu_read_byte(emu, addr) != 0x10 && x86emu_read_byte(emu, addr) != 0x18)
) {
emu->x86.R_AH = 1;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
cnt = x86emu_read_word(emu, addr + 2);
u = x86emu_read_dword(emu, addr + 4);
ul = vm_read_qword(emu, addr + 8);
if(x86emu_read_byte(emu, addr) == 0x18 && u == 0xffffffff) {
u = x86emu_read_dword(emu, addr + 0x10);
}
else {
u = vm_read_segofs16(emu, addr + 4);
}
if(disk >= FIRST_CDROM) {
ul <<= 2;
cnt <<= 2;
}
i = disk_read(emu, u, disk, ul, cnt, 1);
if(i) {
emu->x86.R_AH = 0x04;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
emu->x86.R_AH = 0;
X86EMU_CLEAR_FLAG(emu, F_CF);
break;
case 0x43:
x86emu_log(emu, "; int 0x13: ah 0x%02x (edd disk write)\n", emu->x86.R_AH);
disk = emu->x86.R_DL;
addr = (emu->x86.R_DS << 4) + emu->x86.R_SI;
x86emu_log(emu, "; drive 0x%02x, request packet:\n; 0x%05x:", disk, addr);
j = x86emu_read_byte(emu, addr);
j = j == 0x10 || j == 0x18 ? j : 0x10;
for(i = 0; i < j; i++) x86emu_log(emu, " %02x", x86emu_read_byte(emu, addr + i));
x86emu_log(emu, "\n");
if(
!opt.feature.edd || disk >= MAX_DISKS || !opt.disk[disk].dev ||
(x86emu_read_byte(emu, addr) != 0x10 && x86emu_read_byte(emu, addr) != 0x18)
) {
emu->x86.R_AH = 1;
X86EMU_SET_FLAG(emu, F_CF);
break;
}
cnt = x86emu_read_word(emu, addr + 2);
u = x86emu_read_dword(emu, addr + 4);
ul = vm_read_qword(emu, addr + 8);
if(x86emu_read_byte(emu, addr) == 0x18 && u == 0xffffffff) {