From owner-freebsd-bugs  Thu Apr 23 17:10:02 1998
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Date: Thu, 23 Apr 1998 17:10:01 -0700 (PDT)
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To: freebsd-bugs
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From: Fred Gilham <gilham@csl.sri.com>
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: Fred Gilham <gilham@csl.sri.com>
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The following reply was made to PR kern/6389; it has been noted by GNATS.

From: Fred Gilham <gilham@csl.sri.com>
To: Mike Smith <mike@smith.net.au>
Cc: Eivind Eklund <eivind@yes.no>, 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 17:01:47 -0700

 Mike asked:
 >Just of curiosity, how does this handle the case where the traphandler 
 >does:
 >
 > 	psignal();
 >	return;
 >
 >ie. never gets to the trapsignal() call?
 
 Note that the trap() function is basically broken into a user trap
 branch and a kernel trap branch.
 
 Your scenario would only happen in the kernel trap branch of the
 trap() function.  I'd actually verified that just fixing what the
 T_PROTFLT case does in the user trap branch would make ACL work.  So I
 was pretty sure I didn't need to worry about the kernel branch.
 However, that does somewhat limit the generality of the fix.  But I
 don't know enough to know whether it's even desirable to translate
 things that happen in the kernel trap branch.
 
 I think someone who understands how the trap stuff works needs to
 review this change.
 
 -Fred

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