Is it possible to get rsp+8 directly?

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moveax41h

Joined: 18 Feb 2018
Posts: 59

moveax41h 03 Dec 2019, 06:13

I am trying to perform:

Code:

mov rsi, rsp+8

But I get an error about extra characters on the line. If I do mov rsi, [rsp+8] this does not have the desired effect. But if I do:

Code:

mov rsi, rsp
add rsi, 8

That gives me the desired effect. Must I do that or is there a way to achieve this in one line?

_________________
-moveax41h

03 Dec 2019, 06:13

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20761
Location: In your JS exploiting you and your system

revolution 03 Dec 2019, 06:14

Yes.

Code:

lea rsi,[rsp+8]

03 Dec 2019, 06:14

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8466
Location: Kraków, Poland

Tomasz Grysztar 03 Dec 2019, 08:28

As a coincidence, I have just mentioned this as an incidental remark in the latest part of my elementary tutorial.

03 Dec 2019, 08:28

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