Vulnerability Development mailing list archives
Re: Stack Allocations
From: wwieser () gmx de
Date: Sat, 14 Jul 2001 16:20:50 +0200
On Monday 09 July 2001 15:27, msoda () aspre net wrote:
Hey all,
<snip>
When running 'gcc -S' it shows that 24 bytes are allocated on the stack for buf[]. I thought it should allocate only 16 bytes. It works fine, it just makes no sense to me. If I tweak the assembly and change it to 16 bytes and also change the offsets to %ebp that reference it, it works fine also. Does anyone know why gcc does this? My need to understand everything is killing me!
It's due to gcc's preferred stack boundary. Seems to be some sort of alignment issue. Simply do a bash# gcc -mpreferred-stack-boundary=2 -S foo.c -o foo.s and you get 16 bytes as expected. wwieser
Current thread:
- Stack Allocations msoda (Jul 09)
- Re: Stack Allocations Andrew Barros (Jul 12)
- Re: Stack Allocations Marc Soda (Jul 13)
- Re: Stack Allocations wwieser (Jul 14)
- <Possible follow-ups>
- Re: Stack Allocations Jeff (Jul 10)
- Re: Stack Allocations Andrew Barros (Jul 12)