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| author | Namhyung Kim <namhyung.kim@lge.com> | 2013-11-25 13:42:47 +0900 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-01-02 20:57:05 -0500 |
| commit | b7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9 (patch) | |
| tree | 0831ae7ab363f3789c5cb14bbf4973bfe17287bc /Documentation/trace | |
| parent | 72fd293aa9ae8f4f48d6042be43fe81551c639f2 (diff) | |
| download | lwn-b7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9.tar.gz lwn-b7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9.zip | |
tracing/uprobes: Add @+file_offset fetch method
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 <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/uprobetracer.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt index 6e5cff263e2b..f1cf9a34ad9d 100644 --- a/Documentation/trace/uprobetracer.txt +++ b/Documentation/trace/uprobetracer.txt @@ -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.(*) |