Re: [Adeos-main] ppc64 switch_domain problem

[Philippe Gerum <rpm@xenomai.org>]

Reynolds, Terry (Contractor-SIMTECH) wrote:
> Hi All,
>  
> Are there any ppc64 gurus lurking out there?  My port to ppc64 has a severe problem.  When attempting to register a new domain, as in the RTAI testsuite's latency example, the switch to the new domain fails on the branch to rthal_domain_entry.  It suffers an "unrecoverable FP unavailable exception 800 at 0xd0000..." which is the location of the attr.entry for the link to that function.
>  
> The code has no floating point code in it, so it must be pulling up some garbage instruction that isn't actually at that location.  I made a new function rthal_domain_entry2 which is included in the kernel, it's in the same file as the __adeos_init_domain function (/adeos/ppc64.c for my port).  It's address is a kernel code 'like' 0xc0000...  The switch domain to that function works fine!
>  
> I think the branch to lr works for the kernel address, but not the loaded module one because of some problem with the SLB.  The ppc64 _switch function does modify the memory management hardware if the ESID is different for the task being switched to.
>  
> Anyone have an idea on how to correct this problem?
>  

Since it switches stacks, __adeos_switch_domain() should probably be 
updated to switch the SLB appropriately then.

>  
> TIA!
>  
> Terry Reynolds.
>  
>  
> 
> _______________________________________________
> Adeos-main mailing list
> Adeos-main@domain.hid
> https://mail.gna.org/listinfo/adeos-main


-- 

Philippe.