mov eax,ecx vs push ecx pop eax?

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revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 13 Jan 2009, 18:10

IronFelix: Read the Intel manual 2B. It gives the logical equivalent of PUSH. Basically this:

Code:

sub esp,4
mov [esp],value

You don't have to guess at these things. The manuals explain it all in detail.

13 Jan 2009, 18:10

MazeGen

Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia

MazeGen 13 Jan 2009, 18:37

Maybe he's confused why PUSH [ESP] pushes the value at [original!ESP] instead of [original!ESP-4]

intel man wrote:

if a PUSH instruction uses a memory operand in which the ESP register is used for computing the operand address, the address of the operand is computed before the ESP register is decremented.

13 Jan 2009, 18:37

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