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
|
.code16
.globl vm86_code_start
.globl vm86_code_end
#define GET_OFFSET(x) ((x) - vm86_code_start + 0x100)
vm86_code_start:
movw $GET_OFFSET(hello_world), %dx
movb $0x09, %ah
int $0x21
/* prepare int 0x90 vector */
xorw %ax, %ax
movw %ax, %es
es movw $GET_OFFSET(int90_test), 0x90 * 4
es movw %cs, 0x90 * 4 + 2
/* launch int 0x90 */
int $0x90
/* test IF support */
movw $GET_OFFSET(IF_msg), %dx
movb $0x09, %ah
int $0x21
pushf
popw %dx
movb $0xff, %ah
int $0x21
cli
pushf
popw %dx
movb $0xff, %ah
int $0x21
sti
pushfl
popl %edx
movb $0xff, %ah
int $0x21
#if 0
movw $GET_OFFSET(IF_msg1), %dx
movb $0x09, %ah
int $0x21
pushf
movw %sp, %bx
andw $~0x200, (%bx)
popf
#else
cli
#endif
pushf
popw %dx
movb $0xff, %ah
int $0x21
pushfl
movw %sp, %bx
orw $0x200, (%bx)
popfl
pushfl
popl %edx
movb $0xff, %ah
int $0x21
movb $0x00, %ah
int $0x21
int90_test:
pushf
pop %dx
movb $0xff, %ah
int $0x21
movw %sp, %bx
movw 4(%bx), %dx
movb $0xff, %ah
int $0x21
movw $GET_OFFSET(int90_msg), %dx
movb $0x09, %ah
int $0x21
iret
int90_msg:
.string "INT90 started\n$"
hello_world:
.string "Hello VM86 world\n$"
IF_msg:
.string "VM86 IF test\n$"
IF_msg1:
.string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
vm86_code_end:
|
