Re: [Valgrind-users] Illegal instruction errors (IN / OUT)

[Dan K. <da...@ke...>]

Dirk Mueller wrote:
> On Thursday 04 September 2003 20:10, Gabriel Gomiz wrote:
> 
> 
>>Are this instructions supported in valgrind? If not, is there a complex
>>technical problem in implementing them? Do you have any pointers to docs
>>if I decide to give you a hand and implementing them?
> 
> 
> they're currently not supported. Adding support as in "ignore them" would be 
> fairly easy, but correct support is quite difficult. Per principle, valgrind 
> has to know
> 
> a) that OUT writes a byte / word / dword and that it has to check all the bits
>    it writes for definedness (or ignore some as they don't matter depending
>    on the port?)
> 
> b) that IN reads a value and makes all its bits defined (but what if not
>    all bits are defined?)

How 'bout just escaping to the real system for those two instructions,
and kludging definedness (e.g. for IN, assume all bits are defined, etc.)
- Dan

-- 
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045