fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<gromero> hi. is it possible to set a register value just like a variable at a probe point?
<fche> gromero, hey, I don't think we have a tapset function for that
<fche> I suppose one could write some embedded-C code in order to live dangerously
<gromero> fche: hm I see. I also had to write an inline asm into _stp_print_regs() to inspect the context of a vector register not listed in pt_regs struct. I'm on a PowerPC 64-bit machine by the way... thanks
<gromero> s/context/content/
<fche> you probably don't have to -modify- preexisting functions, just use new ones
<fche> function foo() %{ /* do something with CONTEXT->kregs */ %} kind of thing
<gromero> fche: okido. but at the same time I would like to make it available in the cool print_regs("<register_name>"), so I guess I have to modify in that case...
<gromero> I mean, if I don't want to live dangerously...
<gromero> and add an embedded-C
<gromero> does it make sense?
<gromero> fche: btw , do you think it would be worth making register setting function supported on systemtap?
<fche> gromero, not a crazy idea, just a moderate amount of work; would start from the register() functions in the tapset already, and see what it'd take to make a setter sibling
<gromero> fche: cool. thanks for your advice. btw, I know about systemtap since some time ago and just now I started using it to debug a kernelspace issue: man, what an amazing / awesome piece of code! :)
<fche> so glad to hear it's useful to you!!
<gromero> fche: incredibly useful indeed! :)
<fche> we'd love to hear about your successes (& failures) with it, drop us a note sometime if able
<gromero> fche: sure! I have to get my fix merged upstream first of course... but yes, I intend to at least contribute back the printing for vector and floating-point register on PPC64. Thanks!
<fche> np
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<irker339> systemtap: rth systemtap.git:refs/heads/rth/bpf * release-3.1-80-g92fe99d / dwflpp.cxx: Fix buildok/nfs_proc-detailed.stp http://tinyurl.com/y7nodmdp
<irker339> systemtap: rth systemtap.git:refs/heads/rth/bpf * release-3.1-81-gae0c91c / elaborate.cxx loc2stap.cxx loc2stap.h: Fix buildok/twentynine.stp http://tinyurl.com/ycrlnqwz
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<irker339> systemtap: rth systemtap.git:refs/heads/rth/bpf * release-3.1-82-gfa0b68b / dwflpp.cxx: Fix buildok/pretty-uprobes.stp http://tinyurl.com/ya4bshcd
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