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[Bug uprobes/10324] x86-64 uprobes gives up on 0xf0 prefix (lock)
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 24 Jun 2009 22:09:52 -0000
- Subject: [Bug uprobes/10324] x86-64 uprobes gives up on 0xf0 prefix (lock)
- References: <20090624105323.10324.fche@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From fche at redhat dot com 2009-06-24 22:09 -------
> It's unsupported because I was vaguely uncomfortable about it and have never
> tested probing locked instructions. You could certainly try it out by changing
> the f0 bit from 0 to 1 in good_insns_32[] and good_insns_64[].
I wouldn't trust such an experiment, since "lock" is rich with
concurrency semantics, testing the correctness of the SSOL
emulation would not be trivial.
> See PR #5273, "x86 arch_validate_probed_insn(): lighten up?"
Yeah, if you like, CLOSE/DUPLICATE them.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10324
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