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RE: Multi thread Debugging
- To: 'Nick Garnett' <nickg at cygnus dot co dot uk>, ecos-discuss at sourceware dot cygnus dot com
- Subject: RE: [ECOS] Multi thread Debugging
- From: Fabrice Gautier <Fabrice_Gautier at sdesigns dot com>
- Date: Thu, 31 Aug 2000 15:29:14 -0700
> -----Original Message-----
> From: Nick Garnett [mailto:nickg@cygnus.co.uk]
> Subject: Re: [ECOS] Multi thread Debugging
>
> All your observations are correct. The main problem is that thread
> saved contexts and interrupt saved contexts are different. In all
> other HALs they are the same. I suspect that the simplest fix for now
> is to change the format of the HAL_SavedRegisters structure to echo
> that pushed by "pusha" and replace the "movl"s in context.S with
> "pusha" and "popa". Then most references to this structure will work
> as intended (give or take a few fixes elsewhere).
I fear this is not so simple.
There is a problem too with exception handling. This is critical because of
the handling of the INT3 debug exception.
It seems that in the current design (refering to plf_stub.c) the register
are saved to a structure when an INT3 occurs. And this structure does not
match any other of our context structures...
Exception handling in the stub is not handled in the way the Interrupts
are...(The exceptions are not handled by the kernel, only by the stub it
seems)
Thanks
--
Fabrice Gautier
fabrice_gautier@sdesigns.com