* probing assembly functions doesn't work anymore
@ 2007-07-18 23:17 Andi Kleen
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From: Andi Kleen @ 2007-07-18 23:17 UTC (permalink / raw)
To: systemtap
Hi,
I have an old stp script that worked with some older systemtap version, but now
fails with a current one (CVS of yesterday). After some investigation
it looks like stap cannot hook any pure assembler functions anymore.
e.g. on x86-64
# cat getuser.stp
probe kernel.function("__get_user_4") {
}
# stap getuser.stp
semantic error: no match for probe point while resolving probe point kernel.function("__get_user_4")
Pass 2: analysis failed. Try again with more '-v' (verbose) options.
The function is there of course
# grep get_user_4 /proc/kallsyms
ffffffff80341f90 T __get_user_4
-Andi
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