Re: [steem] small bugs
- From: "Stephen Ware" <sware@xxxxxxxxxxxxxx>
- To: <steem@xxxxxxxxxxxxx>
- Date: Fri, 13 Dec 2002 22:42:59 -0000
> I can't find any problems with tracing traps in Steem v2.4. I
> did find however that you can trace line a and f exceptions, that
certainly
> is wrong. This is what Steem v2.4 is doing when tracing traps:
>
> 1: Set trace bit.
> 2: trap #?.
> <Trap exception happens> - Jump to vector, trace bit cleared, stacked sr
has
> trace bit set.
> <Trace exception happens> - Jump to vector, stacked sr has trace bit
clear.
> 3: Trace routine.
>
> I've tested it on my STE and it seems to be doing the same thing. The
trace
> exception is generated, the stacked pc is the first instruction of the
trap
> routine and the trace bit is clear in the stacked sr. Of course trapv,
div0
> and chk should all do the same thing, they don't on v2.4.
Correct in all respects. Sorry to mess you about!
Merry Xmas
Stephen
--
Steem - http://www.blimey.strayduck.com/
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