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Re: Is r25 saved across syscalls?

from [Kevin D. Kissell] [Permanent Link][Original]
To: linux-mips@linux-mips.org
Subject: Re: Is r25 saved across syscalls?
From: "Kevin D. Kissell" <kevink@paralogos.com>
Date: Mon, 10 Sep 2012 18:04:39 -0700
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References: <20120909193008.GA15157@brightrain.aerifal.cx> <20120910170830.GB24448@linux-mips.org> <20120910172248.GN27715@brightrain.aerifal.cx> <alpine.LFD.2.00.1209110059580.8926@eddie.linux-mips.org>
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On 09/10/2012 05:29 PM, Maciej W. Rozycki wrote:
> I do wonder however why we have these instructions to save/restore $25
> in SAVE_SOME/RESTORE_SOME. This dates back to 2.4 at the very least.
> Ralf, any insights?
Hi, guys.  Maybe the fact that it's used for dispatching PIC calls has
something to do with it?

/K.
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