March 2003 - Darwin-kernel - lists.apple.com

Re: deciphering powerpc registers
by Steven Bytnar 13 Mar '03

13 Mar '03

DSISR = data store interrupt status register. DAR = data exception adddress error. MSR = machine state register http://www.mot.com/powerpc Click on "Library". The programming environment manual for 32 bit procs is where you should start looking. http://e-www.motorola.com/brdata/PDFDB/docs/MPCFPE32B.pdf Page 6-22 (p 242) Different processors may have other bits set in these registers. If something isn't listed, you'll need to look it up specifically for the processor in question. --Steve On Thu, Mar 13, 2003 at 11:03:31AM -0700, Brian Daugherty wrote: > hi, > > I'm trying to debug a kernel panic. I'd like to lookup the meaning of > the > codes contained in the DSISR, MSR and DAR. > > Exception state (sv=0x0DC62C80) > PC=0x90000E2C; MSR=0x0000D030; DAR=0x0DCDB000; DSISR=0x42000000; > LR=0x0001 > > Can anybody point me at some on-line powerpc docs which would help out? > > thanks, > brian > > > -- > Brian Daugherty > Software Engineer > Cisco Systems, Inc. > 5400 Airport Blvd. > Boulder, CO 80301 > Voice: 720.562.6482 > Email: brdaughe(a)cisco.com > _______________________________________________ > darwin-kernel mailing list | darwin-kernel(a)lists.apple.com > Help/Unsubscribe/Archives: > http://www.lists.apple.com/mailman/listinfo/darwin-kernel > Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

Re: deciphering powerpc registers
by Mark A. Matthews 13 Mar '03

13 Mar '03

>Can anybody point me at some on-line powerpc docs which would help out? A good place to start - <http://e-www.motorola.com/webapp/sps/site/taxonomy.jsp?nodeId=018rH3bTdG8653> Click on the processor of interest and the following page lists all the reference docs. -- -Mark <markm(a)XMission.com> _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

Re: deciphering powerpc registers
by Brian Bergstrand 13 Mar '03

13 Mar '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Thursday, March 13, 2003, at 12:03 PM, Brian Daugherty wrote: > hi, > > I'm trying to debug a kernel panic. I'd like to lookup the meaning of > the > codes contained in the DSISR, MSR and DAR. > > Exception state (sv=0x0DC62C80) > PC=0x90000E2C; MSR=0x0000D030; DAR=0x0DCDB000; DSISR=0x42000000; > LR=0x0001 > PC = Program Counter. This is actually r2 (I think) since the PPC does not actually have a PC register. DAR = Data register, this is usually r3, or the first arg to a function call. LR = Link Register which should be the previous function in the call stack. I forget what MSR and DSISR are. > Can anybody point me at some on-line powerpc docs which would help out? > You can look at Motorola's web site for doc on the PPC, also look at Apple's site. I know the PC counter is non-std, but I forget if r3 is the std register for function args. HTH. Brian Bergstrand <http://www.classicalguitar.net/brian/> PGP Key ID: 0xB6C7B6A2 Windows 2000: It sucks less. -----BEGIN PGP SIGNATURE----- Version: PGP 8.0 iQA/AwUBPnDDIXnR2Fu2x7aiEQIPUQCgnGiVQgbht1ZXu0TFtxLfZRlz81sAn2Eg XDsDrLEne+wPp2U1UWT0MJch =E5Xu -----END PGP SIGNATURE----- _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

deciphering powerpc registers
by Brian Daugherty 13 Mar '03

13 Mar '03

hi, I'm trying to debug a kernel panic. I'd like to lookup the meaning of the codes contained in the DSISR, MSR and DAR. Exception state (sv=0x0DC62C80) PC=0x90000E2C; MSR=0x0000D030; DAR=0x0DCDB000; DSISR=0x42000000; LR=0x0001 Can anybody point me at some on-line powerpc docs which would help out? thanks, brian -- Brian Daugherty Software Engineer Cisco Systems, Inc. 5400 Airport Blvd. Boulder, CO 80301 Voice: 720.562.6482 Email: brdaughe(a)cisco.com _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

Re: How can I access the environment of another process?
by Michael Marti 12 Mar '03

12 Mar '03

Dear Jim Thank you very much for your answer! The jobs use LAM/MPI for inter process communication. Therefore they will always be in a different process group than the job script (and even in different nodes). I never used the Mach API. So I would appreciate very much if you could tell me where to start: What documents can I read? Where is the documentation if this API? What function would I use to read the environment? Thanks again! Michael. > On Tuesday, March 11, 2003, at 04:17 PM, Michael Marti wrote: >> Can anyone tell me, how I can access the environment variables of a >> process >> of which I have the kinfo_proc structure. > > The environment variables are available in the address space of the > process, and you can use Mach APIs to read the address space of other > processes. But before describing how that could be done... > >> We are running a computation cluster with 20 Dual G4's. The job >> scheduling >> system sometimes leaves some processes on the node after it kills a >> job. > > Can the job system be modified to create all these processes in the > same process group? It sure would make "reaping" them much easier. > > --Jim > -- ---------------------------------------------------------------------------- Michael Marti Centro de Fisica dos Plasmas Instituto Superior Tecnico Av. Rovisco Pais 1049-001 Lisboa Portugal Tel. +351 21 841 93 79 ---------------------------------------------------------------------------- _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

FW: Re: How can I access the environment of another process?
by Michael Marti 12 Mar '03

12 Mar '03

From: Jim Magee <jmagee(a)apple.com> Date: Wed, 12 Mar 2003 00:11:55 -0500 To: Michael Marti <m.marti(a)cfp.ist.utl.pt> Subject: Re: How can I access the environment of another process? On Tuesday, March 11, 2003, at 04:17 PM, Michael Marti wrote: > Can anyone tell me, how I can access the environment variables of a > process > of which I have the kinfo_proc structure. The environment variables are available in the address space of the process, and you can use Mach APIs to read the address space of other processes. But before describing how that could be done... > We are running a computation cluster with 20 Dual G4's. The job > scheduling > system sometimes leaves some processes on the node after it kills a > job. Can the job system be modified to create all these processes in the same process group? It sure would make "reaping" them much easier. --Jim _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

Re: task_info and virtual_size
by Quinn 12 Mar '03

12 Mar '03

At 21:50 +0100 11/3/03, joe udder wrote: Hello. I am a little curious on how virtual memory per process works in Darwin. I am calling "task_info()" using TASK_BASIC_INFO to retrieve the amount of memory my process is using, but I receive very doubtful numbers. According to a webpage[1], the values are number of pages, but to me they look very much like the size in bytes instead. I came to this conclusion using the "top" and comparing the values for resident memory sizes. I suspect it is merely a typo in the headerfiles? However, the real confusion is "virtual_size", which is a value around 700MB while "top" shows ~90MB. And that one I can't understand at all. Anyone has an idea on how this works? Both sizes are in bytes. You're right and the documentation is wrong. Please file a bug. <http://developer.apple.com/bugreporter/> With regards to "top", it subtracts two values (SHARED_TEXT_REGION_SIZE and SHARED_DATA_REGION_SIZE, both which have the value 0x10000000) from each tasks virtual size to account for the shared memory submap that's incorporated into every process. For more information, you can look at the source [APSL account required]. Both "top" and task_info are in Darwin. <http://www.opensource.apple.com/cgi-bin/registered/cvs/system_cmds/top.tpro…> <http://www.opensource.apple.com/cgi-bin/registered/cvs/xnu/osfmk/kern/task.…> S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

10.2.4 kernel
by Wade Tregaskis 12 Mar '03

12 Mar '03

It seems that the Darwin CVS only has the 10.2.3 kernel. Using this (or the 10.2.1 or 10.2.2 kernels) results in reproducible and frequent kernel panics at various points - using PPP, when copying large files. So obviously I can't use any of the current CVS sources for development work. This is a problem - I need to work on the kernel for my current project, and can't wait months for Apple to update the CVS (by which time they'll have released 10.2.5 or whatever, and probably break everything again). What options do I have, beside installing an older version of OS X (which isn't an option due to lack of disk space)? Wade Tregaskis _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

Re[3]: ...Leaving my Unhappy Childhood behind
by Lance Drake 11 Mar '03

11 Mar '03

On Tuesday, March 11, 2003, at 02:15 PM, Jim Magee wrote: We understand that it is frustrating (especially to Unix programmers who are forced into using some of these other frameworks for "just one thing"), and have been working hard on a proper solution. Sorry for the inconvenience. --Jim Dear Jim (and all), Thanks to everyone for all the graymatter/brainpower applied to helping me. I'll take another run at this effort and try the suggested 'fork then exec' approach. If nobody minds, once that's been accomplished, I'll write a note to this group and let you know how it went. It's really gratifying to know there are knowledgeable folks who are willing and motivated to take the time to help those who are somewhat farther back on the path. Thank You, Lance Drake _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0

How can I access the environment of another process?
by Michael Marti 11 Mar '03

11 Mar '03

Dear List Please excuse me if this is of topic, or if it is a very basic question, but I don't know where to find the answer: Can anyone tell me, how I can access the environment variables of a process of which I have the kinfo_proc structure. We are running a computation cluster with 20 Dual G4's. The job scheduling system sometimes leaves some processes on the node after it kills a job. Since more than one job can run on a machine, I cannot simply kill all user processes on a machine after a job finishes or gets killed. The only way I I can think of is to kill all the processes that have the job id set to the proper value (i.e. The job that just finished) in the environment. For that I need to loop trough all processes and look at there environment. I know how to get an array with the kinfo_proc structures of all the running processes, but how can I access there environment memory? Thanks for your help Michael. -- ---------------------------------------------------------------------------- Michael Marti Centro de Fisica dos Plasmas Instituto Superior Tecnico Av. Rovisco Pais 1049-001 Lisboa Portugal Tel. +351 21 841 93 79 ---------------------------------------------------------------------------- _______________________________________________ darwin-kernel mailing list | darwin-kernel(a)lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.

1 0