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Filipe_Br
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 Posted: Wed Feb 08, 2017 2:41 pm Post subject: Doubt function assembly |
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Look at this script:
| Code: |
push 10
call script2
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I believe this script will pass 10 as parameter. If I am right, it tells me how script2 would get this argument.
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mgostIH
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| Posted: Wed Feb 08, 2017 3:02 pm Post subject: Re: Doubt function assembly |
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| Filipe_Br wrote: | Look at this script:
| Code: |
push 10
call script2
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I believe this script will pass 10 as parameter. If I am right, it tells me how script2 would get this argument. |
And the question is?
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ParkourPenguin
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| Posted: Wed Feb 08, 2017 3:13 pm Post subject: |
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| Code: | script2:
push ebp
mov ebp,esp
mov eax,[ebp+8]
// eax is now 0x10 (16 in dec); do whatever with it
mov esp,ebp
pop ebp
ret |
If you're smart enough to keep track of the stack yourself, establishing a stack frame isn't necessary.
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Filipe_Br
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| Posted: Wed Feb 08, 2017 3:42 pm Post subject: |
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| ParkourPenguin wrote: | | Code: | script2:
push ebp
mov ebp,esp
mov eax,[ebp+8]
// eax is now 0x10 (16 in dec); do whatever with it
mov esp,ebp
pop ebp
ret |
If you're smart enough to keep track of the stack yourself, establishing a stack frame isn't necessary. |
There is always an error in the application. I've tried several script variations, most of the error in the application.
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ParkourPenguin
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| Posted: Wed Feb 08, 2017 3:50 pm Post subject: |
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I don't know what you mean by that. If you're trying to test this and it's crashing, make sure you're removing the argument from the stack.
If it still crashes, post your code so we can tell you what's wrong.
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SunBeam
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| Posted: Wed Feb 08, 2017 3:56 pm Post subject: |
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I guess he gave up on DirectX coding/hooking 
Keep in mind the second script you posted is in stdcall calling convention. If you somehow need to use cdecl, you'll need to "add esp,X" after the call:
| Code: | push 10
call myfunc
add esp,4 |
BR,
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Filipe_Br
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Zanzer
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| Posted: Wed Feb 08, 2017 6:22 pm Post subject: |
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No one wanted to point out that it is actually passing 16 as a parameter?  |
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Filipe_Br
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++METHOS
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| Posted: Thu Feb 09, 2017 1:45 am Post subject: |
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ParkourPenguin did point it out.  |
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