On Fri, 2013-10-18 at 09:38 +0200, Wolfgang Denk wrote: > Default Debian PowerPC doesn't work on e500 because the code contains > "lwsync" instructions, which are unsupported on this core. As a > result, applications using this will crash with an "unhandled signal 4" > "Illegal instruction" error. > > As a work around we add code to emulate this insn. This is expensive > performance-wise, but allows to run standard user land code. > > Signed-off-by: Wolfgang Denk <w...@denx.de> > Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> > Cc: Scott Wood <scottw...@freescale.com> > --- > I am aware that the clean solution to the problem is to build user > space with compiler options that match the target architecture. > However, sometimes this is just too much effort. > > Also, of course the performance of such an emulation sucks. But the > the occurrence of such instructions is so rare that no significant > slowdown can be oserved. > > I'm not sure if this should / could go into mainline. I'm posting it > primarily so it can be found should anybody else need this. > - wd > > arch/powerpc/kernel/traps.c | 7 +++++++ > 1 file changed, 7 insertions(+)
There's already been a patch posted for this: http://patchwork.ozlabs.org/patch/256747/ I plan to apply it for my next pull request. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
