* [Bug translator/18075] New: Add a return-probe variant of .callee
@ 2015-03-02 22:05 jistone at redhat dot com
2015-05-15 16:45 ` [Bug translator/18075] " fche at redhat dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: jistone at redhat dot com @ 2015-03-02 22:05 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=18075
Bug ID: 18075
Summary: Add a return-probe variant of .callee
Product: systemtap
Version: unspecified
Status: NEW
Severity: enhancement
Priority: P2
Component: translator
Assignee: systemtap at sourceware dot org
Reporter: jistone at redhat dot com
AIUI, callee probes are essentially translated into respective call probes with
a filter to match the caller. It would also be useful to have return probes of
this sort. It might even be easier, because I think the registers of a return
probe will already be into the caller's frame.
For example, a fault injection script might wish to tweak the return value of a
function, but only for particular callers, like this glibc article is doing.
https://sourceware.org/glibc/wiki/Testing/WhiteBox
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* [Bug translator/18075] Add a return-probe variant of .callee
2015-03-02 22:05 [Bug translator/18075] New: Add a return-probe variant of .callee jistone at redhat dot com
@ 2015-05-15 16:45 ` fche at redhat dot com
2015-06-08 20:56 ` flu at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: fche at redhat dot com @ 2015-05-15 16:45 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=18075
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fche at redhat dot com
--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
*** Bug 18415 has been marked as a duplicate of this bug. ***
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* [Bug translator/18075] Add a return-probe variant of .callee
2015-03-02 22:05 [Bug translator/18075] New: Add a return-probe variant of .callee jistone at redhat dot com
2015-05-15 16:45 ` [Bug translator/18075] " fche at redhat dot com
@ 2015-06-08 20:56 ` flu at redhat dot com
2015-06-08 22:41 ` jistone at redhat dot com
2015-06-22 14:29 ` flu at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: flu at redhat dot com @ 2015-06-08 20:56 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=18075
Felix Lu <flu at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |flu at redhat dot com
--- Comment #2 from Felix Lu <flu at redhat dot com> ---
The _caller_match() function can be used to match the return with caller.
Example:
stap -e 'probe process("stap").function("version").return { print_ubacktrace();
println(_caller_match(1,1,"/opt/codebase/install/bin/stap", ".absolute",
0x40efff)) }'
0x428d55 : _ZN17systemtap_session13parse_cmdlineEiPKPc+0x9b5/0x5dc0
[/opt/codebase/install/bin/stap]
0x40efff : main+0x21f/0x1320 [/opt/codebase/install/bin/stap]
0x7fe8fca69fe0 [/usr/lib64/libc-2.20.so+0x1ffe0/0x3bd000]
1
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* [Bug translator/18075] Add a return-probe variant of .callee
2015-03-02 22:05 [Bug translator/18075] New: Add a return-probe variant of .callee jistone at redhat dot com
2015-05-15 16:45 ` [Bug translator/18075] " fche at redhat dot com
2015-06-08 20:56 ` flu at redhat dot com
@ 2015-06-08 22:41 ` jistone at redhat dot com
2015-06-22 14:29 ` flu at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: jistone at redhat dot com @ 2015-06-08 22:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=18075
--- Comment #3 from Josh Stone <jistone at redhat dot com> ---
Why are you matching main though? That's the second-level caller; version() is
actually called by parse_cmdline(), as seen in the first step of your
backtrace. That's what I meant by the registers of a return probe already
reflecting the caller's frame.
So process.function("parse_cmdline").callee("version").return would be
translated to process.function("version").return, as you wrote, but with a
_caller_match(1,0,...) in this case.
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* [Bug translator/18075] Add a return-probe variant of .callee
2015-03-02 22:05 [Bug translator/18075] New: Add a return-probe variant of .callee jistone at redhat dot com
` (2 preceding siblings ...)
2015-06-08 22:41 ` jistone at redhat dot com
@ 2015-06-22 14:29 ` flu at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: flu at redhat dot com @ 2015-06-22 14:29 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=18075
Felix Lu <flu at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|systemtap at sourceware dot org |flu at redhat dot com
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2015-03-02 22:05 [Bug translator/18075] New: Add a return-probe variant of .callee jistone at redhat dot com
2015-05-15 16:45 ` [Bug translator/18075] " fche at redhat dot com
2015-06-08 20:56 ` flu at redhat dot com
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2015-06-22 14:29 ` flu at redhat dot com
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