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SubjectRe: sysenter on x86
Date
Followup to:  <1050156926.1449.2.camel@laptop.fenrus.com>
By author: Arjan van de Ven <arjanv@redhat.com>
In newsgroup: linux.dev.kernel
>
>
> --=-EFK+Hzuvs0Z6BUNjBVGk
> Content-Type: text/plain
> Content-Transfer-Encoding: quoted-printable
>
> On Sat, 2003-04-12 at 15:54, Felix von Leitner wrote:
> > I just added sysenter support for linux-2.5 on x86 to the diet libc, but
> > I noted that the original patch said user space should jump to
> > 0xfffff000, which segfaults. Jumping to 0xffffe000 works.
> >=20
> > I suggest adding a comment somewhere in the kernel about the proper
> > calling convention, because the glibc code is frankly not readable in
> > this regard.
>
> you HAVE to use the location as specified with the AT_SYSINFO elf flag.
> The kernel is free to move this address around between builds, as long
> as AT_SYSINFO gives the address for the location.
>

... which quite frankly kind of bites :(

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
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