From: Doug Rabson <dfr@nlsystems.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] static registers during a context switch
Date: Wed, 25 Oct 2000 10:16:59 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590678205622@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590678205620@msgid-missing>
On Tue, 24 Oct 2000, riedel wrote:
> hi everybody, does anybody know what happens to static registers
> (gr0-gr31) in case of a context switch. in the manual, it says static
> registers are visible to all procedures(i guess it shouldn't otherwise
> on a context switch another process would have the same static
> registers) On the other hand, stacked registers are local to
> procedures and saved and restored by RSE which makes sense to me.
Normally on a context switch, only the callee saved registers are
preserved (since the context switch appears as a function call to the
process which initiates it). In the case of ia64, this means that gr4-gr7
are preserved from the static register set.
--
Doug Rabson Mail: dfr@nlsystems.com
Phone: +44 20 8348 6160
next prev parent reply other threads:[~2000-10-25 10:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-25 2:47 [Linux-ia64] static registers during a context switch riedel
2000-10-25 10:16 ` Doug Rabson [this message]
2000-10-25 14:28 ` Don Dugger
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