Re: [Bug uprobes/9826] gdb/uprobes deathmatch goes to OT

[Chris Moller <cmoller at redhat dot com>]

Jim Keniston wrote:
> On Fri, 2009-02-06 at 22:14 +0000, mhiramat at redhat dot com wrote:
>   
>> ------- Additional Comments From mhiramat at redhat dot com  2009-02-06 22:14 -------
>> Can gdb use uprobe for probing target process?
>> I think if the kernel supports a 'standard' method of setup break point, gdb
>> doesn't need to tweak target code manually.
>>
>>     
>
> [I'm replying outside bugzilla, since topic is much broader than the
> subject of #9826.]
>
> Certainly there's a shared vision of a user-space-breakpoint service
> that could be used by kernel-side services like uprobes and by a
> system-call API like ptrace or its successor.  A key feature of this
> service would be to support probing of multithreaded apps with no probe
> misses, as provided by uprobes and kprobes.
>
> The ubp API I proposed here
> https://www.redhat.com/archives/utrace-devel/2008-November/msg00020.h
> is a first stab at such a service.  I actually coded up an x86
> implementation of it -- and sent a copy to roland, cmoller, and some
>   

I'm trying to incorporate that copy into the froggy module and access it
through the froggy user-space API   That's part of a lot of other stuff,
so it's not happening over night, but I expect I'll get something that
kinda limps along in a month or so.

> Bangalore IBMers Nov. 21 -- but I never got around to testing it.  (I'll
> forward you a copy, Masami.)
>
> Roland later suggested that we factor instruction analysis out of ubp,
> and also expand ubp to accommodate architectures that don't do
> single-stepping per se.
>
> As for building a system-call API atop the current uprobes... I don't
> know of any support for pursuing that.
>
> Jim
>
>
>
>   

-- 
Chris Moller

  I know that you believe you understand what you think I said, but
  I'm not sure you realize that what you heard is not what I meant.
      -- Robert McCloskey

Attachment: signature.asc
Description: OpenPGP digital signature