linux-kernel - Re: Various x86 syscall mechanisms

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Message-Id: <20080627215248.6E9C6154058@magilla.localdomain>
Date:	Fri, 27 Jun 2008 14:52:48 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Various x86 syscall mechanisms

> > [...] "int $0x80" for 32-bit
> > syscalls made from 64-bit tasks on CONFIG_IA32_EMULATION kernels (intended
> > for valgrind).
> 
> Hm, I think that's a post-facto rationalization.  

It was my recollection of something Andi had said about why it was there.
My recollections are not a reliable source of accurate information.

> Thanks for the clarifying overview.  I've been piecing my understanding 
> together as I've been getting 64-bit pvops Xen working, and trying to 
> fit what it has to do to implement all these instructions and mode 
> combinations, and it looks like I'm about right.

I'm always glad to help.


Thanks,
Roland
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