Return a value from proc

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Killswitch

Joined: 21 Jan 2006
Posts: 20

Killswitch 29 Apr 2006, 08:27

Hey,

If I use the proc macro, how can I return a value from the procedure? Thanks for your help!

29 Apr 2006, 08:27

silkodyssey

Joined: 02 Oct 2003
Posts: 198
Location: St.Vincent & the Grenadines

silkodyssey 29 Apr 2006, 09:20

The standard way to return a value is in the eax register but you're free to do it however you wish.

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silkodyssey

29 Apr 2006, 09:20

Killswitch

Joined: 21 Jan 2006
Posts: 20

Killswitch 29 Apr 2006, 12:50

So something like this:

Code:

proc ...
 Mov [eax],1
 ret
endp

Would leave 1 in eax?

29 Apr 2006, 12:50

bogdanontanu

Joined: 07 Jan 2004
Posts: 403
Location: Sol. Earth. Europe. Romania. Bucuresti

bogdanontanu 29 Apr 2006, 12:55

nope, it will put 1 into the address pointed by eax
The notation"[eax]" means " the memory location who's address is the value in eax" ...

You should use

Code:

proc ...
 mov eax,1
 ret
endp

to return 1 from your procedure

29 Apr 2006, 12:55

Killswitch

Joined: 21 Jan 2006
Posts: 20

Killswitch 29 Apr 2006, 13:46

That was a silly mistake (you can't tell I'm quite a noob Razz

)!

Thanks a lot for your help guys!

29 Apr 2006, 13:46

silkodyssey

Joined: 02 Oct 2003
Posts: 198
Location: St.Vincent & the Grenadines

silkodyssey 29 Apr 2006, 15:14

Quote:

hat was a silly mistake (you can't tell I'm quite a noob Razz)

I think making mistakes is a very good way to learn especially when you have to go through turtuous debugging sessions to correct those mistakes. Very Happy

_________________
silkodyssey

29 Apr 2006, 15:14

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