[okl4-developer] KD# exception delivery error

[Jorge Torres]

Than you very much Geoffrey,

I will try to find where such hack is, but at this moment I can't understand
something: when you mean a hack that uses the scheduler for exceptions, you
mean that scheduler thread is responsible for its corresponding thread
exemptions?, shouldn't it be thread's handler thread?

Thank you very much, and please forgive my ignorance,

Jorge

On 7/30/07, Geoffrey Lee <glee at ok-labs.com> wrote:
>
> On Sun, Jul 29, 2007 at 08:46:00PM -0400, Jorge Torres wrote:
> > Hi okl4.org,
> >
> >
> > I get this problem while trying to change the wombat threads scheduler
> > register (not for L_Timer and L_syscall), but for (L_1, L_2,
> > L_n.................)  threads,  but when I do so i get  "KD# exception
> > delivery error" message before jumping into KDB,  what I'm doing is that
> > I've replaced the eas_create_thread  and L4_Set_Priority on
> > linux/kernel/arch/l4/kernel/process.c with two new functions
> > mpsched_eas_create_thread and mpsched_set_priority, the
> > mpsched_eas_create_thread is the same as the original eas_create_thread
> but
> > it has a default fixed value for the  scheduler  parameter,  and what
> the
> > mpsched_set_priority does is to send an IPC to a the NEW scheduler (say
> > NEWSCHED) thread specifing target TID and priority. after receiving
> it(the
> > NEWSCHED)  simply performs an L4_Set_Priority based on that information.
> (it
> > works=it changes threads priority), but as system runs a tiny bit more,
> it
> > simply drops into such error message, here is the output:
> > .
> > .
>
> Hi Jorge
>
> There is a hack that uses the scheduler for exceptions as well.
>
> See pistachio/arch/ia32/src/exception.cc:send_exception_ipc().  I am
> guessing that it could not send the exception message, most probably
> a syscall, hence it gave this error.
>
>
> >
> > Anyways does somebudy knows why (where) is this exception delivery error
> > happening?
> >
> > Oh by the way, I dont know, why is it that every time I change some code
> on
> > which linux kernel code depends on (arch/l4 code), forexample iguana's
> eas
> > code,  i get:
> >
> > make[1]: *** [vmlinux] Error 1
> > make: *** [_all] Error 2
> >
>
> I am not an expert on the build system, but probably the Linux
> build system does not know code outside of it has changed so
> it was not able to build things properly as it got a bit
> confused about what needs to be built and what does not.
>
> > so I have to remove the build directory and when I rebuild (no changes
> made
> > on code) things go fine!!.
> >
> > Thank you very much for your help,
> >
> >
> > Jorge
>
>         - gl
>
>
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> > Developer at okl4.org
> > https://lists.okl4.org/mailman/listinfo/developer
>
>
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