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tracing/uprobes: Add @+file_offset fetch method

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Enable to fetch data from a file offset.  Currently it only supports
fetching from same binary uprobe set.  It'll translate the file offset
to a proper virtual address in the process.

The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.

Suggested-by: Oleg Nesterov <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: zhangwei(Jovi) <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
This commit is contained in:
Namhyung Kim 2013-11-25 13:42:47 +09:00 • committed by Steven Rostedt
commit b7e0bf341f
5 changed files with 63 additions and 1 deletions
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1
Documentation/trace/uprobetracer.txt
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@ -32,6 +32,7 @@ Synopsis of uprobe_tracer
FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG
@ADDR : Fetch memory at ADDR (ADDR should be in userspace)
@+OFFSET : Fetch memory at OFFSET (OFFSET from same file as PATH)
$stackN : Fetch Nth entry of stack (N >= 0)
$stack : Fetch stack address.
$retval : Fetch return value.(*)