Another RIP addressing question

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 02 May 2006, 11:50

Hello,

I have been reading about RIP addressing mode in x64 and all is clear except in which instructions RIP can be used.

I can make for example:

mov al, [RIP + 34h]

But can I use RIP with other instruction operands like:

mov al, [RIP + RBX + 34h] ???

Thanks,
Alorent

02 May 2006, 11:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19876
Location: In your JS exploiting you and your system

revolution 02 May 2006, 13:08

Quote:

mov al, [RIP + RBX + 34h] ???

X86-64 doesn't support encodings like that. RIP can only be used by itself or with an immediate offset.

02 May 2006, 13:08

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 03 May 2006, 10:47

Thanks revolution! Wink

03 May 2006, 10:47

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19876
Location: In your JS exploiting you and your system

revolution 03 May 2006, 13:03

Quote:

Thanks revolution!

You are welcome.

03 May 2006, 13:03

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