Re: [patch] x86: fix ESP corruption CPU bug

From: Ondrej Zary
Date: Sun Mar 13 2005 - 14:39:56 EST

Stas Sergeev wrote:

Grzegorz Kulewski wrote:

Does the bug also egsist on AMD CPU's?

Yes. As well as the ones of a Transmeta etc.
I just haven't tested the old Cyrixes, that
AFAIK were trying to ignore some Intel bugs.
The test-case for the bug is here:

I've just ran that on my Cyrix MII PR300 and the bug is present:
old_ss=0x7b new_ss=0x7f
In sighandler: esp=bffff780
old_esp=0xbffff780 new_esp=0xc1a6f780

I have also an older Cyrix CPU - 6x86 PR166 - but can't test it now as it's sitting in a plastic box on the shelf :-)

UMC U5SX/33 in my router - also present:
old_ss=0x7b new_ss=0x7f
In sighandler: esp=bffff820
old_esp=0xbffff820 new_esp=0xc003f820

Ondrej Zary
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