On Sun, 2004-10-31 20:55:50 +0100, Dennis Grevenstein <dennis@pcde.inka.de>
wrote in message <20041031195550.GA12397@aton.pcde.inka.de>:
> On Sun, Oct 31, 2004 at 08:26:53PM +0100, Jan-Benedict Glaw wrote:
> > From my fading MIPS knowledge, ip22zilog_interrupt called
> > ip22zilog_receive_chars and the later one crashed. Now, use objdump and
> > create a disassembly dump of the object file that contains the IP22
> > Zilog stuff. There, find the part that's 0x20 bytes away from the start
> > of ip22zilog_receive_chars. Now you know the cause of this oops.
>
> That's what I found:
> 8810da14: 8c82001c lw v0,28(a0)
> 8810da18: 00809021 move s2,a0
> 8810da1c: 8c510000 lw s1,0(v0)
It's accessing (most probably) a structure's first field, where the
structure is supplied by pointer in v0.
> 8810da20: 00a09821 move s3,a1
> 8810da24: 8e220118 lw v0,280(s1)
So now, find out what v0 belongs to. Maybe compiling the kernel with
debug infos (-g) and using objdump -S (for intermixing sources) will
help you.
Most probably, something wasn't correctly registered, so the pointer to
a struct is just a NULL pointer.
> and:
>
> 8810e224: 0e04367f jal 8810d9fc <ip22zilog_receive_chars>
> 8810e228: 02803021 move a2,s4
> 8810e22c: 0a04386e j 8810e1b8 <ip22zilog_interrupt+0xd8>
> 8810e230: 32020001 andi v0,s0,0x1
> 8810e234: 0e0437bc jal 8810def0 <ip22zilog_transmit_chars>
So this all fits properly :-)
> > From
> > here, try to figure out the reason for it...
>
> Well, I'm sure "MIPS assembly for Dummies" must be available
> somewhere. While I keep looking please help me ;-)
"objdump -S" for starters, but it seems quite straight forward. Maybe
paste the code of ip22zilog_receive_chars, I don't have that at hands
right now...
MfG, JBG
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