Scott Wood <scottw...@freescale.com> wrote on 30/10/2009 01:12:28: > > On Sat, Oct 17, 2009 at 02:01:38PM +0200, Joakim Tjernlund wrote: > > Joakim Tjernlund/Transmode wrote on 17/10/2009 13:24:18: > > > > > > Rex Feany <rfe...@mrv.com> wrote on 16/10/2009 22:25:41: > > > > > > > > Thus spake Joakim Tjernlund (joakim.tjernl...@transmode.se): > > > > > > > > > Right, it is the pte table walk that is blowing up. > > > > > I just noted that 2.6 lacks a tophys() call in its table walk > > > > > so I removed that one(there is one more tophys call but I don't think > > > > > it should be removed). > > > > > Try this addon patch: > > > > > > > > no difference > > > > > OK, thinking a bit more, this part should not be executed as > > > copy_tofrom_user executes in kernel space. > > > > > > Any chance you can stick a HW breakpoint on FixupDAR? > > > Perhaps there is something different with kernel > > > virtual address to phys address? > > > A simple topys() works in 2.4, but perhaps not in 2.6? > > > this is the part of interest: > > > FixupDAR: /* Entry point for dcbx workaround. */ > > > /* fetch instruction from memory. */ > > > mfspr r10, SPRN_SRR0 > > > andis. r11, r10, 0x8000 > > > tophys (r11, r10) > > > beq- 139b /* Branch if user space address */ > > > 140: lwz r11,0(r11) > > > > Probably better to walk the kernel page table too. Does this > > make a difference(needs the tophys() patch I posted earlier): > > After applying by hand (whitespace damage), I get this and a bunch more:
OK, please send your diff to head_8xx.S. Maybe I can spot an error, otherwise you will have to set a hw BP on fixDAR and step through it. Jocke _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
