On Wed, Jan 28, 1998 at 08:10:59AM +0100, Harald Koerfgen wrote:
> > On the R3000 c0_epc is a readonly register - as documented. That's ok
> > because the R3000 uses a different way of handling exceptions. What you'll
> > have to do to return from an exception is about as follows:
> > restore c0_status
> > move k1, sp ; needed later
> > restore all gp registers
> > restore hi/lo registers
> > lw k0, PT_EPC(sp)
> > jr k0
> > rfe ; in the delay slot of the jr
> > Ralf
> Thanks for the info, Ralf. Either this is not mentioned in the IDT
> manual or I have simply overlooked this. The Kane book would have saved
> me a lot of headache, I assume.
Yes, the Kane book documents c0_epc as r/o register. Dunno about the IDT
docs but the R3081 docs from them look quite good otherwise.
> But then again, as a side effect,
> debugging output via serial port is working now on my DS5000/133 :-).
In that case you can try to use the remote debugging support in the kernel.
Ok, it will need some R3k polishing also ...