From: Ulrich Drepper <drepper@redhat.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Jakub Jelinek <jakub@redhat.com>, Ingo Molnar <mingo@elte.hu>
Subject: Re: glibc binaries w/ sysenter support
Date: Mon, 30 Dec 2002 20:49:59 -0800 [thread overview]
Message-ID: <3E1121F7.60808@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0212301838050.1614-100000@home.transmeta.com>
Linus Torvalds wrote:
> can you tell me what the new glibc does for different "clone()" system
> calls?
clone() and vfork() both use int $0x80. The vfork() problem is obvious.
And the way we use clone() with a separate stack for the child it is
easy to see that we cannot prepare the stack appropriately for both
situations. When the child is started it returns with a carefully
crafted stack which among other values find the start functions address
on the stack.
There might be a way to make this use int and vsyscall at the same time
but I don't think it is worth it.
--
--------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
prev parent reply other threads:[~2002-12-31 4:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-29 19:51 glibc binaries w/ sysenter support Ulrich Drepper
2002-12-29 23:51 ` Linus Torvalds
2002-12-31 2:52 ` Linus Torvalds
2002-12-31 4:49 ` Ulrich Drepper [this message]
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