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[Bug uprobes/10324] x86-64 uprobes gives up on 0xf0 prefix (lock)
- From: "jkenisto at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 24 Jun 2009 21:47:05 -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 jkenisto at us dot ibm dot com 2009-06-24 21:47 -------
(In reply to comment #1)
> From runtime/uprobes2/uprobes_x86.c 0xf0(lock prefix is documented as not
> supported)
> ---------------------------------------------------------------------
> * others -- Do we need to support these?
...
> * f0 - lock prefix
> ------------------------------------------------------------------------
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[].
See PR #5273, "x86 arch_validate_probed_insn(): lighten up?"
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10324
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