Exceptions

Exceptions

[Jeff Harrell]

I have been working through the initialization code for the MIPS/Linux
kernel and have traced through to the point
where the MIPS exceptions are installed.  I have not been able to locate
the following routines

        handle_adel
        handle_ades
        handle_sys
        handle_bp
        handle_n
        handle_cpu
        handle_ov
        handle_tr
        handle_fpe

I see where these are defined by "extern asmlinkage" references but
can't locate the actual implementation of these
exceptions.  Any idea what files these routines might be located in?
Any help would be greatly appreciated

Thank you,
Jeff Harrell


---------8< excerpt from kernel/traps.c -----

 set_except_vector(1, handle_mod);
 set_except_vector(2, handle_tlbl);
 set_except_vector(3, handle_tlbs);
 set_except_vector(4, handle_adel);
 set_except_vector(5, handle_ades);
 /*
  * The Data Bus Error/ Instruction Bus Errors are signaled
  * by external hardware.  Therefore these two expection have
  * board specific handlers.
  */
 set_except_vector(6, handle_ibe);
 set_except_vector(7, handle_dbe);
 ibe_board_handler = default_be_board_handler;
 dbe_board_handler = default_be_board_handler;

 set_except_vector(8, handle_sys);
 set_except_vector(9, handle_bp);
 set_except_vector(10, handle_ri);
 set_except_vector(11, handle_cpu);
 set_except_vector(12, handle_ov);
 set_except_vector(13, handle_tr);
 set_except_vector(15, handle_fpe);


--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jeff Harrell                    Work:  (801) 619-6104
Broadband Access group/TI
jharrell@ti.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Re: Exceptions

[Carsten Langgaard]

Jeff Harrell wrote:

> I have been working through the initialization code for the MIPS/Linux
> kernel and have traced through to the point
> where the MIPS exceptions are installed.  I have not been able to locate
> the following routines
>
>         handle_adel
>         handle_ades
>         handle_sys
>         handle_bp
>         handle_n
>         handle_cpu
>         handle_ov
>         handle_tr
>         handle_fpe
>
> I see where these are defined by "extern asmlinkage" references but
> can't locate the actual implementation of these
> exceptions.  Any idea what files these routines might be located in?
> Any help would be greatly appreciated

They are located in arch/mips/kernel/entry.S
They are a little hard to find as they use the BUILD_HANDLER macro to
extract the routines.

>
>
> Thank you,
> Jeff Harrell
>
> ---------8< excerpt from kernel/traps.c -----
>
>  set_except_vector(1, handle_mod);
>  set_except_vector(2, handle_tlbl);
>  set_except_vector(3, handle_tlbs);
>  set_except_vector(4, handle_adel);
>  set_except_vector(5, handle_ades);
>  /*
>   * The Data Bus Error/ Instruction Bus Errors are signaled
>   * by external hardware.  Therefore these two expection have
>   * board specific handlers.
>   */
>  set_except_vector(6, handle_ibe);
>  set_except_vector(7, handle_dbe);
>  ibe_board_handler = default_be_board_handler;
>  dbe_board_handler = default_be_board_handler;
>
>  set_except_vector(8, handle_sys);
>  set_except_vector(9, handle_bp);
>  set_except_vector(10, handle_ri);
>  set_except_vector(11, handle_cpu);
>  set_except_vector(12, handle_ov);
>  set_except_vector(13, handle_tr);
>  set_except_vector(15, handle_fpe);
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jeff Harrell                    Work:  (801) 619-6104
> Broadband Access group/TI
> jharrell@ti.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

--
_    _ ____  ___   Carsten Langgaard   mailto:carstenl@mips.com
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Re: Exceptions

[Ralf Baechle]

On Thu, Dec 09, 1999 at 09:05:47AM +0100, Carsten Langgaard wrote:

> > I have been working through the initialization code for the MIPS/Linux
> > kernel and have traced through to the point
> > where the MIPS exceptions are installed.  I have not been able to locate
> > the following routines
> >
> >         handle_adel
> >         handle_ades
> >         handle_sys
> >         handle_bp
> >         handle_n
> >         handle_cpu
> >         handle_ov
> >         handle_tr
> >         handle_fpe
> >
> > I see where these are defined by "extern asmlinkage" references but
> > can't locate the actual implementation of these
> > exceptions.  Any idea what files these routines might be located in?
> > Any help would be greatly appreciated
> 
> They are located in arch/mips/kernel/entry.S
> They are a little hard to find as they use the BUILD_HANDLER macro to
> extract the routines.

No wonder why I haven't ever received a patch for these routines since
the MIPS port exists :-)

They should be rewritten anyway; the current code expands the macro
SAVE_ALL quite often, so has a bad cache performance.

  Ralf