Re: [Qemu-devel] checking if linux-user address is mapped (sparc)

[Blue Swirl]

On 9/3/08, Vince Weaver <address@hidden> wrote:
> Hello
>
>  so now I'm trying to get the vpr spec2k benchmarks going under
>  sparc32plus-linux-user
>
>  In an optimized memory scanning routine the code is doing:
>
>     ldxa  [ %o0 ] #ASI_PNF, %o3
>
>  Which is a load from the "no fault" address space.
>  What this means is that even if you are loading from an invalid address, no
> fault should occur.
>
>  qemu of course segfaults when the address is invalid.
>
>  Is there some way to check in linux-user if a virtual memory address is
> mapped?  That way it could be checked before the ldl_raw() is run?
>
>  hopefully I am not misunderstanding the bug here.

Could you test this patch?

no_fault_accesses.diff
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