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
|
[GLOBAL setjmp]
setjmp:
; Store general purpose registers
; (in new stack frame)
mov [esp+4], eax
mov [esp+8], ebx
mov [esp+12], ecx
mov [esp+16], edx
mov [esp+20], edi
mov [esp+24], esi
mov [esp+28], ebp
mov [esp+32], esp
; Store flags
pushf
pop eax
mov [esp+36], eax
; Store return address
mov eax, [esp]
mov [esp+40], eax
; return 0
xor eax, eax
ret
[GLOBAL longjmp]
longjmp:
; on previous stack, resume return address
mov eax, [esp+32]
mov ebx, [esp+40]
mov [eax], ebx
; resume flags
mov eax, [esp+36]
push eax
popf
; load return value in eax
mov eax, [esp+44]
; resume geneal purpose registers, except eax/esp
mov ebx, [esp+8]
mov ecx, [esp+12]
mov edx, [esp+16]
mov edi, [esp+20]
mov esi, [esp+24]
mov ebp, [esp+28]
; resume previous esp
mov esp, [esp+32]
; return as if we were the setjmp call
ret
|
