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tools/perf: Add '__rel_loc' event field parsing support

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Add new '__rel_loc' dynamic data location attribute support.
This type attribute is similar to the '__data_loc' but records the
offset from the field itself.
The libtraceevent adds TEP_FIELD_IS_RELATIVE to the
'tep_format_field::flags' with TEP_FIELD_IS_DYNAMIC for'__rel_loc'.

Link: https://lkml.kernel.org/r/163757344810.510314.12449413842136229871.stgit@devnote2

Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2021-11-22 18:30:48 +09:00
committed by Steven Rostedt (VMware)
parent cd7729043b
commit 7c689c8397
7 changed files with 14 additions and 0 deletions
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2
tools/perf/util/scripting-engines/trace-event-perl.c
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@@ -392,6 +392,8 @@ static void perl_process_tracepoint(struct perf_sample *sample,
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = *(int *)(data + field->offset);
offset &= 0xffff;
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
} else
offset = field->offset;
XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));