Register clobbering

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Yeast

Joined: 26 May 2007
Posts: 2

Yeast 20 Dec 2008, 04:22

Hello, I'm using CRT, kernel32, and user32 functions, and I'm trying to figure out which registers get clobbered by these functions.

I searched around and couldn't find any information on the topic, so I did some tests and it looks like eax, ecx, and edx get clobbered, and ebx, esi, edi, and ebp keep their values after a function call. Is this correct?

20 Dec 2008, 04:22

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20759
Location: In your JS exploiting you and your system

revolution 20 Dec 2008, 04:39

Correct.

20 Dec 2008, 04:39

Yeast

Joined: 26 May 2007
Posts: 2

Yeast 20 Dec 2008, 04:53

Cool, thanks for verifying.

20 Dec 2008, 04:53

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20759
Location: In your JS exploiting you and your system

revolution 20 Dec 2008, 04:57

Just remember that CRT functions are CCALL and Windows API functions (with one exception) are STDCALL.

20 Dec 2008, 04:57

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