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
|
.global task_pusha
task_pusha:
pushf
push $0x8 // code segment
push $userfunc
pusha
push %ds
push %es
push %fs
push %gs
/*
now stack looks like:
param // esp+64
returnaddy
eflags
code segment
userfunc
eax // rest by popa
ecx
edx
ebx
esp
ebp
esi
edi
ds
es
fs
gs
*/
mov 64(%esp),%eax // get address of alternative stack where we want to simulate the pusha
mov (%esp),%ecx
mov %ecx,(%eax)
mov 4(%esp),%ecx
mov %ecx,4(%eax)
mov 8(%esp),%ecx
mov %ecx,8(%eax)
mov 12(%esp),%ecx
mov %ecx,12(%eax)
mov 16(%esp),%ecx
mov %ecx,16(%eax)
mov 20(%esp),%ecx
mov %ecx,20(%eax)
mov 24(%esp),%ecx
mov %ecx,24(%eax)
mov 28(%esp),%ecx
mov %ecx,28(%eax)
mov 32(%esp),%ecx
mov %ecx,32(%eax)
mov 36(%esp),%ecx
mov %ecx,36(%eax)
mov 40(%esp),%ecx
mov %ecx,40(%eax)
mov 44(%esp),%ecx
mov %ecx,44(%eax)
mov 48(%esp),%ecx
mov %ecx,48(%eax)
mov 52(%esp),%ecx
mov %ecx,52(%eax)
mov 56(%esp),%ecx
mov %ecx,56(%eax)
pop %gs
pop %fs
pop %es
pop %ds
popa
pop %eax
pop %eax
pop %eax
ret
|
