From owner-freebsd-bugs  Thu Apr 23 12:30:05 1998
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Date: Thu, 23 Apr 1998 12:30:01 -0700 (PDT)
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From: Eivind Eklund <eivind@yes.no>
Subject: Re: kern/6389: Need to be able to access trap-to-signal mapping to for Linux emulation to allow Allegro Common Lisp (and maybe other apps) to run.
Reply-To: Eivind Eklund <eivind@yes.no>
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The following reply was made to PR kern/6389; it has been noted by GNATS.

From: Eivind Eklund <eivind@yes.no>
To: Mike Smith <mike@smith.net.au>
Cc: gilham@csl.sri.com, freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/6389: Need to be able to access trap-to-signal mapping to for Linux emulation to allow Allegro Common Lisp (and maybe other apps) to run.
Date: Thu, 23 Apr 1998 21:25:59 +0200

 On Thu, Apr 23, 1998 at 12:07:24PM -0700, Mike Smith wrote:
 > > I've gone through these changes and fixed style-problems; here are the
 > > changes as diffs against today's current with hopefully OK stule.
 > > This pass a LINT compile (I've not yet tested running with a new
 > > kernel on my own machine; I'll do this in a few minutes).
 > 
 > Just of curiosity, how does this handle the case where the traphandler 
 > does:
 > 
 >  	psignal();
 > 	return;
 > 
 > ie. never gets to the trapsignal() call?
 > 
 > In particular, I thought this was the case with the T_PROTFLT trap...
 
 The psignal() here is wrapped in
    if (intr_nesting_level == 0) {
 which seems to not trigger, at least not for the Linux emulator case.
 
 I run with the patch, and it _do_ make Allegro Common Lisp for Linux
 work properly.
 
 If somebody that know this code (trap.c with friends) better than me
 care to comment, that would be nice.
 
 Eivind.

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