topic Re: KP services in Operating System - OpenVMS

KP services

ptrskg — Wed, 18 Jan 2006 05:07:32 GMT

Hi,
I am trying to use the "new" KP services to replace an own "stack-switching" mechanims used in an old program. I have written a little test program in C but can't understand how to link it, which sharable or lib should be included in the linking.
Can anyone help me!

Thanks
Peter

Re: KP services

Kris Clippeleyr — Wed, 18 Jan 2006 05:34:00 GMT

Peter,
Compile:
CC source-file+SYS$SHARE:SYS$LIB_C.TLB/LIBR
Link:
LINK /SYSEXE object-file

Regards,
Kris (aka Qkcl)

Re: KP services

Ian Miller. — Wed, 18 Jan 2006 09:21:55 GMT

sounds like fun :-)
I assuming you are working from
http://h71000.www7.hp.com/doc/82final/6673/6673pro_contents_001.html#toc_appendix_c

Re: KP services

ptrskg — Thu, 19 Jan 2006 10:15:23 GMT

Some more problems... so I reopened the thread.
Thanks to Kris I have managed to compile and link my C test code and also implemented some of the KP services in my target program. This is done on an IA64 running 8.2-1. But when i move the code to Alpha/8.2 it crashes in the exe$kp_restart routine. As I understand, the KP services in "user" mode are supported both on AXP and I64 from 8.2. Or not? Perhaps even for 7.3-2?(not likely).

Have anybody some ideas around this?

My test code is attached together with the crash output.

Thanks,
Peter

Re: KP services

Jan van den Ende — Thu, 19 Jan 2006 10:44:15 GMT

Peter,

AFAIK, KP stands for Keith Parris.
With his name spelled out, as I just did, there is a fair chance he will jump at it.

I guess that would constitute the ultimate in availabe help.

Proost.

Have one on me.

jpe

Re: KP services

Ian Miller. — Fri, 20 Jan 2006 11:50:54 GMT

KP is Kernel Process except its not a process so they just call them KP services now.

Whats on line 17418 of the C compiler listing kp.lis ?

Re: KP services

Volker Halle — Fri, 20 Jan 2006 12:09:29 GMT

Ian,

I can easily reproduce this. Works on I64 V8.2, but fails on Alpha V8.2:

$ RUN kp
...
DBG> g
task1 start
%SYSTEM-F-ACCVIO, access violation, reason mask=00, virtual address=00000A7472617471, PC=00000A7472617470, PS=0000001B
break on unhandled exception at 11495251473520
%DEBUG-I-SOURCESCOPE, source lines not available for %PC in scope number 0
Displaying source for 1\%PC
17426: exe$kp_restart(kpb1, status);

The address VA=PC+1 doesn't look right !

R26 has been loaded from @48(R2) and contains the bad address:

DBG> exa/ins 303EC-20:303ec
KP\main\%LINE 17424+24: STL R0,#X0008(FP)
KP\main\%LINE 17426: LDQ R16,#X0020(R2)
KP\main\%LINE 17426+4: LDL R16,(R16)
KP\main\%LINE 17426+8: LDL R17,#X0008(FP)
KP\main\%LINE 17426+0C: BIS R31,#X02,R25
KP\main\%LINE 17426+10: LDQ R26,#X0048(R2) <<< load R26
KP\main\%LINE 17426+14: LDQ R27,#X0050(R2)
KP\main\%LINE 17426+18: JSR R26,(R26)
KP\main\%LINE 17428: BIS R31,#X01,R0

DBG> exa/quad @r2+48
0000000000010168: 00000A7472617473

Volker.

Re: KP services

Volker Halle — Fri, 20 Jan 2006 12:56:11 GMT

Peter,

if you use the constant KPREG$K_HLL_REG_MASK as the reg-mask argument in the exe$kp_start call, the program also works on OpenVMS Alpha V8.2:

status = exe$kp_start(kpb1, (void *)task1, KPREG$K_HLL_REG_MASK);

AXPVMS $ run/nodeb kp
task1 start
task1 restart
end rtn

Volker.

Re: KP services

Jan van den Ende — Fri, 20 Jan 2006 13:45:19 GMT

So,

here I was utterly off-target.
Guess I am not yet too old to learn something new :-)

Proost.

Have one on me.

jpe

Re: KP services

ptrskg — Mon, 23 Jan 2006 03:12:02 GMT

Volker, and the rest of you, thanks a lot for your help.
It's good to know that out there in the binary space, there is always someone willing to help a colleague in distress.

Peter
(I promise to read the documentation better next time)