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happyreadygo
Advanced Cheater
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Joined: 14 Sep 2011
Posts: 87
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 Posted: Thu Jan 12, 2012 9:24 pm Post subject: what do this assembly code do.(control flow) |
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I have basic assembly knowleage , only cmp x,y and mov x,y but idon't know that control flow.
here is the whole function.
mov eax,[esp+04]
test eax,eax
jnge 004df49d
cmp eax,09
jnl 004df49d
mov edx,[esp+08]
lea eax,[eax+eax*2] // this line had edited
mov [ecx+eax*4+44],edx
xor eax,eax
ret 0008
mov eax,fffffffd
ret 0008
can anybody explain what the code is doing in term of higher language.
what i want is to force always "mov [ecx+eax*4+44],edx"
are there any tutorial of assembly control flow.
Last edited by happyreadygo on Thu Jan 12, 2012 10:46 pm; edited 1 time in total |
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mgr.inz.Player
I post too much
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Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
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| Posted: Thu Jan 12, 2012 9:58 pm Post subject: |
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lea eax,[eax+eax+eax*2] , are you sure?
maybe: lea eax,[eax+eax*2]
| Code: |
test eax,eax = cmp eax,0
JNGE (not 'greater or equal') = JL (less)
JNL (not less) = JGE (greater or equal)
lea eax,[eax+eax*2] = multiply eax by 3 |
So it would be (more or less) (pascal pseudo code):
| Code: |
index := arg1; ([esp+04])
value := arg2; ([esp+08])
start := ECX (where array/structure starts)
if index >= 0 and index <= 8 then
begin
index := index * 3;
array(start + index * 4 + 44) := value
// above two lines could be replaced with this:
// array(start + index * 12 + 44) := value
return 0;
end
else return -3; |
_________________
Last edited by mgr.inz.Player on Thu Jan 12, 2012 10:57 pm; edited 1 time in total |
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happyreadygo
Advanced Cheater
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Joined: 14 Sep 2011
Posts: 87
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| Posted: Thu Jan 12, 2012 10:44 pm Post subject: |
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| mgr.inz.Player wrote: | lea eax,[eax+eax+eax*2] , are you sure?
maybe: lea eax,[eax+eax*2]
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I made a mistake.
I am really thank you.  I ll try to understand and learn from your post.
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