Messages in this thread | | | Date | Wed, 18 Jun 2003 18:15:02 +0200 (CEST) | From | Guennadi Liakhovetski <> | Subject | Re: VIA Ezra CentaurHauls |
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On Wed, 18 Jun 2003 P@draigBrady.com wrote: > Guennadi Liakhovetski wrote: > > We have a platform with the above processor, and we happened to have 2 > > revisions thereof: stepping 8 and 10. With stepping 8 we are getting > > "random" application crashes (segfaults), sometimes with kernel-Oopses. > > The distribution is Debian-Woody. > > Interesting, so stepping 10 is OK?
Looks so.
> > I saw some messages on the Debian > > mailing list about problems with exactly this CPU, however, it was not > > related to different revisions (stepping), perhaps, the author only had > > / tried stepping 8. The fix was to upgrade libc. > > so is it a glibc bug or CPU bug?
Good question...
> > I've done this (to version libc6_2.3.1-16, but it didn't help. Any ideas? > > You could search for CMOV instructions on your system, > which could cause wierdness, like: > > find / -perm +111 -type f | > while read bin; do > objdump --disassemble $bin 2>/dev/null | > grep -q cmov && echo "$bin has cmov" > done
Yeah, will try. Plus libraries...
> Note C3 Nehemiah do have CMOV (but no 3dnow).
Meanwhile, I've written a micro-program with an assembly-inline with cmov. I have no idea about the ix86 assembly, so, I've just done
int main(void) { int x=0,y=1;
__asm__( "testl %0, %0\n" " cmovnz %0, %1":"=r" (x) :"r" (y)); exit(x); }
On "10" the exit code is 1, which is correct (?), on "8" the exit code is 76. Funny enough, strace on "8" produces also semget(2, 1074927648, 0) = -1 ENOSYS (Function not implemented) but this, most probably, comes from the new libc6, that I installed there.
Guennadi --------------------------------- Guennadi Liakhovetski, Ph.D. DSA Daten- und Systemtechnik GmbH Pascalstr. 28 D-52076 Aachen Germany
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