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[Bug runtime/10013] Support ENABLED sdt probe macro
- From: "mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 5 Apr 2009 19:17:31 -0000
- Subject: [Bug runtime/10013] Support ENABLED sdt probe macro
- References: <20090330093705.10013.mjw@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From mjw at redhat dot com 2009-04-05 19:17 -------
Maybe we can teach uprobes to replace with a specific move/assignment
instruction instead of a trap instruction. Then you could define ENABLE_PROBE()
with something like:
#define ENABLED_PROBE() ({char e = 0; asm ("mov $0x0, %0" :"=r"(e):"0"(e)); e;})
(of course with the magic macro label .probe section stuff to know the actual
address of the mov instruction)
Then instead of with a normal STAP_PROBE replacing a "nop" with "int3", you
would replace the "mov $0x0, %somereg" with "mov $0x1, %somereg".
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10013
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