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Clarification on x86 statements

 
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Aviar³
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PostPosted: Fri Apr 04, 2008 3:18 pm    Post subject: Clarification on x86 statements Reply with quote
I need some clarification on a couple of x86 Assembly Machine Language commands and their purposes. Any help (even reasonable random guesses) are appreciated. All code below fallows NASM format.

Xor (Exclusive or):

Code:
xor eax, eax


Push:

Code:
push eax


Pop:

Code:
pop eax


lea (Load effective address):

Code:
Lea eax,[dsi+4]


P.S. In case anyone is wondering, I know eax is a register. (General Purpose, 32 bit)
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Aikos
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PostPosted: Sat Apr 05, 2008 6:20 am    Post subject: Reply with quote
xor eax,eax is equal to mov eax,0, but costs 2 bytes instead of 5.
push and pop are functions used to add and remove data on a stack, and I suggest you to check what a stack is if you don't know what's happening.
As for lea, I have no ideas how exactly it calculates the effective address. You might need to find help from someone else.
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Psy
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PostPosted: Sat Apr 05, 2008 7:25 am    Post subject: Reply with quote
Brief explanation of LEA
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Aviar³
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PostPosted: Sat Apr 05, 2008 1:11 pm    Post subject: Reply with quote
Thank you very much. Appreciate the help.
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