[xds-sigma-comp] Re: Trap question
- From: rollerton@xxxxxxxxx
- To: xds-sigma-comp@xxxxxxxxxxxxx
- Date: Fri, 08 Apr 2011 22:52:25 +0000
"
For traps the IA always points to the trapping instruction so the OS can
analyze why the trap occured. For interrupts this is not true, the IA
points to the next instruction. I would have to go dig some but I think for
the move byte string type instructions the source and dest registers point
to the address that caused the problem also. Not sure on this though.
--
Joe Chisolm
Marble Falls, Texas
830-265-8018
"
- Show quoted text -
On 04/08/2011 09:07 AM, Robert Ollerton wrote:
---------- Forwarded message ----------
From: Steve Martin <steve@xxxxxxxxxxxx>
Date: Fri, Apr 8, 2011 at 7:22 AM
Subject: [xds-sigma-comp] Trap question
To: xds-sigma-comp@xxxxxxxxxxxxx
The Sigma documentation says that, when a trap occurs, the IA contents
(containing the next instruction address) are decremented by one before
trapping to the XPSD instruction. Are there any exceptions to that? I'm
trying to get my head around the concepts of just when IA gets
incremented and just when the various traps occur in the execution
sequence.
--
Joe Chisolm
Marble Falls, Texas
830-265-8018
On Apr 8, 2011 7:22am, Steve Martin <steve@xxxxxxxxxxxx> wrote:
The Sigma documentation says that, when a trap occurs, the IA contents
(containing the next instruction address) are decremented by one before
trapping to the XPSD instruction. Are there any exceptions to that? I'm
trying to get my head around the concepts of just when IA gets
incremented and just when the various traps occur in the execution
sequence.
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