Thanks Artem, but I was actually asking about the CTF info, I always thought the probes used the CTF info for *knowing* where to instrument. So if I ran the CTFCONVERT utility on a *binary*, it should append CTF sections to it should it not ?
If the CTFCONVERT ran successfully I should be able to see a .SUNW_ctf section when I run objdump --section-headers. But since this was not there in the binary but still FBT was able to instrument the *entry* of the function I was curious does FBT provider need the CTF info for function entry/return ? -- Shrikanth R K On Mon, May 31, 2010 at 2:21 AM, Artem Belevich <[email protected]> wrote: > You may be confusing CTF info and the probes. Those are different things. > > CTF info just describes data types and variable/function location. > DTrace later uses it to figure out where and how to install the > probes. > > Probes are installed dynamically, at runtime when DTrace program is > run. That's why you see it with kgdb on the live kernel once probe has > been installed. > DTrace does not modify your original kernel binary, so you will not > see any probes there. > > --Artem > > > > On Sun, May 30, 2010 at 12:10 PM, Shrikanth Kamath > <[email protected]> wrote: > > I have a query about the FBT provider in DTrace, does FBT provider not > need > > the CTF info for the /kernel binary... > > > > I have this observation, when I disassemble say a 'kernel_funtion' , I > see > > the function is not instrumented... > > > > (kgdb) disassemble kernel_function > > Dump of assembler code for function kernel_function: > > 0xc04aa05d <kernel_function+0>: push %ebp > > 0xc04aa05e <kernel_function+1>: mov %esp,%ebp > > 0xc04aa060 <kernel_function+3>: sub $0x2c,%esp > > > > > > Now after I did a 'fbt::kernel_function:entry', if I disassemble the > > 'kernel_function'... > > > > (kgdb) disassemble kernel_function > > Dump of assembler code for function kernel_function: > > 0xc04aa05d <kernel_function+0>: lock mov %esp,%ebp <== > FBT > > instrumentation > > 0xc04aa060 <kernel_function+3>: sub $0x2c,%esp > > > > If I do a 'objdump' on the kernel.debug binary I do not see any CTF > sections > > showing up? > > > > > > -- > > Shrikanth R K > > _______________________________________________ > > [email protected] mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > > To unsubscribe, send any mail to " > [email protected]" > > > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
