[ECOS] Debugging net stack.

Jonathan Larmour jlarmour@redhat.com
Fri Oct 20 06:10:00 GMT 2000

Fabrice Gautier wrote:
> The problem debugging the net stack is that it get initialized before the
> debug stuff... When I get:
> HAL/diag SERIAL init
> Interrupt: 3
> Network stack using 65536 bytes for misc space
>                     65536 bytes for mbufs
>                     131072 bytes for mbuf clusters
> Interrupt: 3
> pc_i82559_init
> Bad device private pointer 188E00
> then I guess the "interrupt: 3" message means "Sorry guy! Debug interrupt is
> not set up yet..."
> How can I modify the initialisation order so that I can at least see what
> calls lead to this erroneous pointer ?

[ Yes, I'm trawling the old e-mail I missed before ]

You could try changing the order by editing the relative priorities in
infra/current/include/cyg_type.h, but I greatly doubt that's the issue

If you are debugging via serial, with stubs included, normally you should
just be able to set a breakpoint in the initialization code before the C++
constructors are run (which is the point the stack gets initialized). I've
certainly done that before.

The problem is almost certainly simply the following bit in the i386

        .extern cyg_hal_invoke_constructors
        call    cyg_hal_invoke_constructors

        .extern initialize_stub
        call    initialize_stub

Try just swapping these around.

If it works, let us know so we can update the sources. Thanks!

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