On Tue, Apr 18, 2017 at 12:47:30AM -0700, Richard Henderson wrote: > On 04/16/2017 04:23 PM, Stafford Horne wrote: > > When debugging in gdb you might want to inspect instructions in mapped > > pages or in exception vectors like 0x800 etc. This was previously not > > possible in qemu since the *get_phys_page_debug() routine only looked > > into the data tlb. > > > > Change to fall back to look into instruction tlb and plain physical > > pages. > > > > Signed-off-by: Stafford Horne <sho...@gmail.com> > > Oh the horrors of a software managed TLB. > > You might do well to architecturally define an SPR that holds the page table > base, even if for real hardware that's only used by the software refill to > load up the address. > > That would give qemu the option of performing a real page table walk. This > would fix this debug hook properly (so that you can examine pages that > aren't in the TLB at all). It would also optionally allow QEMU to skip the > software refill, which *significantly* speeds up emulation.
Understood, I guess we would also need a way to represent which paging model we are using (1 level, 2 level etc)? > That said, > > Reviewed-by: Richard Henderson <r...@twiddle.net> Thanks for the review. -Stafford > > r~
