Date: Fri, 3 Sep 1999 14:03:11 -0600 From: Nate Williams <nate@mt.sri.com> To: Keith White <Keith.White@site.uottawa.ca> Cc: Nate Williams <nate@mt.sri.com>, Maruyama Fuyuhiko <fuyuhik8@is.titech.ac.jp>, java-port@FreeBSD.ORG, freebsd-java@FreeBSD.ORG Subject: Re: Some bugs exist in JDK for FreeBSD. Message-ID: <199909032003.OAA04282@mt.sri.com> In-Reply-To: <Pine.BSF.3.96.990903153310.12506A-100000@mail2.csi.uottawa.ca> References: <199909031555.JAA02569@mt.sri.com> <Pine.BSF.3.96.990903153310.12506A-100000@mail2.csi.uottawa.ca>
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> > > When you try division of two special int values, x86 cpu causes
> > > SIGFPE. You can easily see it. Try this "Test.java" compile with
> > > FreeBSD's javac.
> > >
> > > public class Test {
> > > public static void main(String[] args) {
> > > System.out.println("0x80000000 / -1 = " + (0x80000000/-1));
> > > }
> > > }
> > >
> > > I think only this combination (i.e. 0x80000000/-1) causes unexcepted
> > > SIGFPE, so JavaVM may easily handle it. Our JIT compiler can handle
> > > it in support functions for JIT compiled methods, but I think JavaVM
> > > should handle it by itself!
> > >
> > > This bug may exist all version of JDK for FreeBSD (may be in Linux
> > > version), but I have checked only these versions.
> > >
> > > jdk1.1.8_AOUT.V99-7-19.tar.gz
> > > jdk1.1.8_ELF.V99-7-19.tar.gz
> >
> > Thanks for pointing this out, we'll look into this!
>
> I have fixed this bug. The problem is that DIVIDE traps are sent
> as SIGFPE and we didn't trap and interpret this signal like Solaris. Since
> we need a working executeJava_p5 to trap these signals, I backported the JDK1.2
> cpuid patch. (Now we'll finally be able to use the assembler version of
> the JVM for JDK1.1.x. Things should speed up a bit...)
>
> Commits to follow after 3.x verification.
Whoo hoo!!! As always, Keith comes through. :) :)
Nate
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