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Re: Adding(?) XI support to MIPS-Linux?

To: "Kevin D. Kissell" <>
Subject: Re: Adding(?) XI support to MIPS-Linux?
From: Brian Foster <>
Date: Wed, 18 Jun 2008 11:45:38 +0200
Cc:, David Daney <>, Thiemo Seufer <>, Andrew Dyer <>
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On Wednesday 18 June 2008 11:36:53 Kevin D. Kissell wrote:
> Brian Foster wrote:
> >  Whilst thinking about the problem and possible solutions,
> >  it occurred to me there could be a defect in the current
> >  trampoline:  Suppose there is a signal, either at point A,
> >  due to <instr> itself, or at point B, which is caught on
> >  this stack, and the user-land signal-handler ‘return’s.
> >
> >  Doesn't the signal-handler/sigreturn stack-frame overwrite
> >  the FP trampoline?   [ ... ]
> When I first integrated the FP emulator into the kernel, back in 2.2.x,
> I seem to recall that someone found this problem and that I came up with
> a tweak to signal stack setup that protected the FP branch delay slot
> trampoline.  Maybe I'm mistaken, or maybe the tweak was lost?

 The error is mine:  I overlooked the tweak.
 Now that you mention it / remind me of it,
 I distinctly recall it; in fact, that was
 what first alerted me to the existance of
 the FP trampoline.

sorry & cheers!
“How many surrealists does it take to   | Brian Foster
 change a lightbulb? Three. One calms   | somewhere in south of France
 the warthog, and two fill the bathtub  |   Stop E$$o (ExxonMobil)!
 with brightly-coloured machine tools.” |

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