From owner-freebsd-java  Wed Mar 10 20:22:18 1999
Delivered-To: freebsd-java@freebsd.org
Received: from cafe.muraoka.info.waseda.ac.jp (cafe.muraoka.info.waseda.ac.jp [133.9.68.49])
	by hub.freebsd.org (Postfix) with ESMTP id 6811A14D70
	for <freebsd-java@FreeBSD.ORG>; Wed, 10 Mar 1999 20:22:14 -0800 (PST)
	(envelope-from shudoh@muraoka.info.waseda.ac.jp)
Received: from muraoka.info.waseda.ac.jp (shudoh@localhost [127.0.0.1])
	by cafe.muraoka.info.waseda.ac.jp (8.9.1a/3.7W) with ESMTP id NAA03845;
	Thu, 11 Mar 1999 13:20:50 +0900
Message-Id: <199903110420.NAA03845@cafe.muraoka.info.waseda.ac.jp>
To: Nate Williams <nate@mt.sri.com>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: jre1.1.7 core dump on FreeBSD 3.1 (intel)
In-reply-to: Your message of "Wed, 10 Mar 1999 18:07:06 MST."
	<199903110107.SAA12226@mt.sri.com>
Date: Thu, 11 Mar 1999 13:20:50 +0900
From: SHUDO Kazuyuki <shudoh@muraoka.info.waseda.ac.jp>
Sender: owner-freebsd-java@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

> > When
> > I run either java or jre, I get a "Floating point exception" and I get a
> > core file.

> None that I'm aware of.  Are you using a 386 box or something that might
> cause floating point exceptions?

FreeBSD don't mask some floating point exceptions which
are masked on initial state of x87. Overflow(OM),
Devided by zero(ZM) and illegal operation(IM) aren't
masked.

Does JDK for FreeBSD change these FPU exception masks
from default value?

We can investigate the states of the masks by the
following code:

#include <stdio.h>
int main(int argc, char **argv) {
  unsigned short cw;
  __asm__("fnstcw %0" : "=m"(cw));
  printf("FPU control word: 0x%04x\n", (int)cw);
  return 0;
}

The code shows FPU control word.
  On linux:	0x037f
  On FreeBSD:	0x1272


Kazuyuki SHUDO				Happy Hacking!
  Muraoka Lab., Grad. School of Sci. & Eng., Waseda Univ.


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-java" in the body of the message