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Re: port-i386/43655 (integer division by zero delivers SIGFPE with wrong siginfo code on i386)
The following reply was made to PR port-i386/43655; it has been noted by GNATS.
From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, port-i386-maintainer%netbsd.org@localhost,
Taylor R Campbell <campbell+netbsd%mumble.net@localhost>
Subject: Re: port-i386/43655 (integer division by zero delivers SIGFPE with
wrong siginfo code on i386)
Date: Sat, 24 Jul 2010 11:34:15 -0400
On Jul 23, 3:15pm, campbell+netbsd%mumble.net@localhost (Taylor R Campbell)
-- Subject: Re: port-i386/43655 (integer division by zero delivers SIGFPE wit
| I'm cc'ing port-i386-maintainer because it looks like amd64 has the
| same problem, from this snippet in amd64/amd64/trap.c:
| case T_DIVIDE|T_USER:
| ksi.ksi_code = FPE_FLTDIV;
| T_DIVIDE is the code delivered by trap 0 in amd64/amd64/vector.S,
| which is the trap for integer division by zero. I think changing that
| and the analogous line in i386/i386/trap.c to use FPE_INTDIV should
| fix the problem, but I haven't tested to confirm this. FPE_FLTDIV is
| delivered for floating-point division by zero separately, in
| i386/isa/npx.c for i386 and in amd64/amd64/fpu.c for amd64.
| Nearby in both trap.c files is FPE_FLTOVF for integer overflow (traps
| 4 and 5), and, in i386/i386/trap.c, FPE_INTOVF for FPU exceptions
| (trap #x10, in what seems to be an unusual case, when NNPX = 0). This
| code needs to exchange some INTs and FLTs, methinks.
I am on it.
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