On Sun, Apr 04, 2004 at 07:35:12PM +0200, Karsten Merker wrote:
> On Sun, Apr 04, 2004 at 05:50:10PM +0200, Guido Guenther wrote:
> > On Sun, Apr 04, 2004 at 01:52:12PM +0200, Karsten Merker wrote:
> > > On a DECstation 5000/20, having an R3000, the following combinations work:
> > > - Debian 2.4.19 plus Debian/Woody glibc (2.2.5)
> > > - Debian 2.4.19 plus Debian/Sarge glibc (2.3.2)
> > > - CVS 2.4.25 from 2004/03/25 plus Debian/Woody glibc (2.2.5)
> > > But running the same CVS 2.4.25 with the Debian/Sarge glibc (2.3.2)
> > > causes (at least) ls, sleep and tar to die with "illegal instruction".
> > What is the illegal instruction? Gdb should tell.
> It is an "ll" instruction in libpthread (checked in the cases of
> ls, sleep and tar). ll/sc should be emulated by the kernel on R3k,
> so it looks like there is a problem with the emulation code.
The reason seems to be in arch/mips/kernel/cpu-probe.c. In function
cpu_probe_legacy the following flags are set for R2k/R3k:
c->options = MIPS_CPU_TLB | MIPS_CPU_NOFPUEX |
i.e. R2k and R3k are assumed to have ll/sc implemented, so the
ll/sc emulation does not get called. The following micro-patch
should fix that.
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