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authorNamhyung Kim <namhyung.kim@lge.com>2013-11-25 13:42:47 +0900
committerSteven Rostedt <rostedt@goodmis.org>2014-01-02 20:57:05 -0500
commitb7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9 (patch)
tree0831ae7ab363f3789c5cb14bbf4973bfe17287bc /Documentation/trace
parent72fd293aa9ae8f4f48d6042be43fe81551c639f2 (diff)
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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.txt1
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.(*)