Thanks for the information. Fyi,There also seems to be Linux Kernel State tracer at http://sourceforge.net/projects/lkst/ Thanks and Regards Deepak -----Original Message----- From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of Sudhanshu Goswami Sent: Friday, March 11, 2005 7:53 AM To: kernelnewbies@xxxxxxxxxxxx Subject: Re: kprobes, is there a way print local variables or parameters using kprobes Hi, If you want to print a function's parameters using KProbes you'll have to use JProbes. With JProbes you register a function's address which has the same prototype as the function at which you are placing the probe. When the function in the kernel is called first your handler is going to be called which will get the copy of all arguments. You can print those arguments here. Check out these: struct jprobe (include/linux/kprobes.h) - Just place "entry" address there. register_jprobe() unregister_jprobe In your probe handler remember to call jprobe_return() just before the end of function. As far as local variables are concerned you can place a kprobe somehwere in the middle of the function and then in your pre_handler you can do some stack tracing hackery to print local variable values. I guess that's the only way to do that as of now. Regards, Sudhanshu On Fri, 11 Mar 2005 17:24:57 +0530, Kotian, Deepak <Deepak.Kotian@xxxxxxxxx> wrote: > > Hi, > > > > kprobes, > > is there any way to print kernel function's local variables or kernel function parameters using kprobes ? > > Currently, only printing global variables using prinntk seems to be OK from kprobe > > handler. > > e.g. strace on the user application side to trace system calls and prints parameters as well, is there something like ktrace > > to trace linux kernel. > > > > Thanks and Regards > > Deepak > > > P.S. Have also posted this query at lkml. > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
