On Sun, 2004-10-31 20:55:50 +0100, Dennis Grevenstein <dennis@xxxxxxxxxxxx> wrote in message <20041031195550.GA12397@xxxxxxxxxxxxxxxxx>: > 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 -- Jan-Benedict Glaw jbglaw@xxxxxxxxxx . +49-172-7608481 _ O _ "Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg _ _ O fuer einen Freien Staat voll Freier Bürger" | im Internet! | im Irak! O O O ret = do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TCPA));
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