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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
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